63 results on '"binary systems"'
Search Results
2. Random packing fraction of binary similar particles: Onsager's excluded volume model revisited
- Author
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Brouwers, H.J.H. and Brouwers, H.J.H.
- Abstract
In this paper, the binary random packing fraction of similar particles with size ratios ranging from unity to well over 2 is studied. The classic excluded volume model for spherocylinders and cylinders proposed by Onsager [1] is revisited to derive an asymptotically correct expression for these binary packings. From a Taylor series expansion, it follows that the packing fraction increase by binary polydispersity equals 2f(1-f)X1(1-X1)(u-1)2+O((u-1)3), where f is the monosized packing fraction, X1 is the number fraction of a component, and u is the size ratio of the two particles. This equation is in excellent agreement with the semi-empirical expression provided by Mangelsdorf and Washington [2] for random close packing (RCP) of spheres. Combining both approaches, a generic explicit equation for the bidisperse packing fraction is proposed, which is applicable to size ratios well above 2. This expression is extensively compared with computer simulations of the random close packing of binary spherocylinder packings, spheres included, and random loose sphere packings (1 ≤ u ≤ 2). The derived generic closed-form and parameter-free equation, which contains a monosized packing fraction, size ratio, and composition of particle mix, appears to be in excellent agreement with the collection of computer-generated packing data using four different computer algorithms and RCP and random loose packing (RLP) compaction states. Furthermore, the present analysis yields a monodisperse packing fraction map of a wide collection of particle types in various compaction states. The explicit RCP—RLP boundaries of this map appear to be in good agreement with all reviewed data. Appendix A presents a review of published monodisperse packing fractions of (sphero)cylinders for aspect ratios l/d from zero to infinity and in RLP and RCP packing configurations, and they are related to Onsager's model. Appendix B presents a derivation of the binary packing fraction of disks in a plane (R2) and hype, In this paper, the binary random packing fraction of similar particles with size ratios ranging from unity to well over 2 is studied. The classic excluded volume model for spherocylinders and cylinders proposed by Onsager [1] is revisited to derive an asymptotically correct expression for these binary packings. From a Taylor series expansion, it follows that the packing fraction increase by binary polydispersity equals 2f 1ÿf)X1 1ÿX1) uÿ1)2 + Oÿ uÿ1)3), where f is the monosized packing fraction, X1 is the number fraction of a component, and u is the size ratio of the two particles. This equation is in excellent agreement with the semi-empirical expression provided by Mangelsdorf and Washington [2] for random close packing (RCP) of spheres. Combining both approaches, a generic explicit equation for the bidisperse packing fraction is proposed, which is applicable to size ratios well above 2. This expression is extensively compared with computer simulations of the random close packing of binary spherocylinder packings, spheres included, and random loose sphere packings 1 4 u 4 2). The derived generic closed-form and parameter-free equation, which contains a monosized packing fraction, size ratio, and composition of particle mix, appears to be in excellent agreement with the collection of computer-generated packing data using four different computer algorithms and RCP and random loose packing (RLP) compaction states. Furthermore, the present analysis yields a monodisperse packing fraction map of a wide collection of particle types in various compaction states. The explicit RCP ± RLP boundaries of this map appear to be in good agreement with all reviewed data. Appendix A presents a review of published monodisperse packing fractions of (sphero)cylinders for aspect ratios l=d from zero to infinity and in RLP and RCP packing configurations, and they are related to Onsager's model. Appendix B presents a der
- Published
- 2024
3. Detailed Follow-up Studies of Three Ultracompact sdB Binaries
- Author
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Stringer, Eric and Stringer, Eric
- Abstract
Hot subdwarf stars are thought to be helium-core burning stars which lost most of their hydrogen rich envelope. Most of these stars are found in compact binaries with a sub-sample showing orbital periods well below one hour. These ultracompact systems have white dwarf companions and as such they are double detonation type Ia supernova progenitors if the white dwarfs are sufficiently massive. We present follow-up studies of three ultracompact hot subdwarf binaries. Using data from the Zwicky Transient Facility, we find orbital periods of 33.6, 37.3, and 36.9 minutes for ZTF 1946+3203, ZTF 0640+1738, and ZTF 0643+0318 respectively. The light curves show ellipsoidal variability of the hot subdwarf star with potential eclipses of an accretion disc. Phase-resolved spectroscopic observations with Keck were used to measure a radial velocity curve and atmospheric parameters of the hot subdwarf stars. ZTF J0643 shows evidence of accretion disk emission lines in the average spectrum. Combining light curve and spectroscopic fits will allow us to measure precise system properties such as masses, to determine the evolutionary and future evolution of these systems. In a preliminary analysis for ZTF 1946+3203 we find a mass-transferring hot subdwarf star with a low mass white dwarf companion. This system is below the Chandrasekhar mass, so the system will most likely merge after the sdB becomes a white dwarf, forming a single R crB star instead of exploding. ZTF 0640+1738 is similarly below the Chandrasekhar mass, however the evidence for a disk is much more tenuous and more precise data is needed to fully understand the evolutionary path for this system.
- Published
- 2023
4. GMcal_TieLinesVL: Graphical User Interface (GUI) for the Topological Analysis of Experimental and Calculated GM Functions for Binary and Ternary (Isobaric or Isothermal) Vapor-Liquid Equilibrium (VLE or VLLE) Data (including Tie-Lines, Derivatives, Distillation Boundaries, LL Critical Points Location, etc.)
- Author
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Universidad de Alicante. Departamento de Ingeniería Química, Universidad de Alicante. Instituto Universitario de Ingeniería de los Procesos Químicos, Labarta, Juan A., Olaya, María del Mar, Marcilla, Antonio, Universidad de Alicante. Departamento de Ingeniería Química, Universidad de Alicante. Instituto Universitario de Ingeniería de los Procesos Químicos, Labarta, Juan A., Olaya, María del Mar, and Marcilla, Antonio
- Abstract
Similar to previous MatLab Graphical User Interfaces (GUI’s) developed to systematically check the consistency of LLE data correlation results, GMcal_TieLinesLL [http://rua.ua.es/dspace/handle/10045/51725], or Boundaries_LL_NRTL [http://hdl.handle.net/10045/121471] for the analysis of the miscibility boundaries that the NRTL model present, this GUI, GMcal_TieLinesVL (New Version v.2.2), allows the analysis of experimental and calculated (isobaric or isothermal) vapor-liquid (or vapor-liquid-liquid) equilibrium data for binary and ternary systems, in the sense presented in the following papers, to detect the necessity of considering larger dependences (of temperature or pressure, respectively) in the binary interaction parameters of the model used (e.g. NRTL model) and also to check the consistency of VLE data correlation results through the topological information contained in the Gibbs energy of mixing function: * Procedure for the correlation of normal appearance VLE data, where the classical models dramatically fail with no apparent reason. Fluid Phase Equilibria. 2019, 493, 88-101 (https://doi.org/10.1016/j.fluid.2019.04.001). * The unavoidable necessity of considering temperature dependence of the liquid Gibbs energy of mixing for certain VLE data correlations. Fluid Phase Equilibria. 2018, 473, 17-31 (https://doi.org/10.1016/j.fluid.2018.05.025). * Should we trust all the published LLE correlation parameters in phase equilibria? Necessity of their Assessment Prior to Publication. Fluid Phase Equilibria. 2017, 433, 243-252 (http://dx.doi.org/10.1016/j.fluid.2016.11.009). * LLE data correlation using NRTL model for different types of binary systems: UCST, LCST and closed miscibility loops. Industrial & Engineering Chemistry Research. 2020, 59(17), 8469-8479 (https://doi.org/10.1021/acs.iecr.0c00141). * Checking Liquid-Liquid Critical Plait Conditions and their Application in Ternary Systems. Industrial & Engineering Chemistry Research. 2012, 51(13), 5098-5102 (h
- Published
- 2022
5. GMcal_TieLinesVL: Graphical User Interface (GUI) for the Topological Analysis of Experimental and Calculated GM Functions for Binary and Ternary (Isobaric or Isothermal) Vapor-Liquid Equilibrium (VLE or VLLE) Data (including Tie-Lines, Derivatives, Distillation Boundaries, LL Critical Points Location, etc.)
- Author
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Universidad de Alicante. Departamento de Ingeniería Química, Universidad de Alicante. Instituto Universitario de Ingeniería de los Procesos Químicos, Labarta, Juan A., Olaya, Maria del Mar, Marcilla, Antonio, Universidad de Alicante. Departamento de Ingeniería Química, Universidad de Alicante. Instituto Universitario de Ingeniería de los Procesos Químicos, Labarta, Juan A., Olaya, Maria del Mar, and Marcilla, Antonio
- Abstract
Similar to previous MatLab Graphical User Interfaces (GUI’s) developed to systematically check the consistency of LLE data correlation results, GMcal_TieLinesLL [http://rua.ua.es/dspace/handle/10045/51725], or Boundaries_LL_NRTL [http://hdl.handle.net/10045/121471] for the analysis of the miscibility boundaries that the NRTL model present, this GUI, GMcal_TieLinesVL (New Version v.2.2), allows the analysis of experimental and calculated (isobaric or isothermal) vapor-liquid (or vapor-liquid-liquid) equilibrium data for binary and ternary systems, in the sense presented in the following papers, to detect the necessity of considering larger dependences (of temperature or pressure, respectively) in the binary interaction parameters of the model used (e.g. NRTL model) and also to check the consistency of VLE data correlation results through the topological information contained in the Gibbs energy of mixing function: * Procedure for the correlation of normal appearance VLE data, where the classical models dramatically fail with no apparent reason. Fluid Phase Equilibria. 2019, 493, 88-101 (https://doi.org/10.1016/j.fluid.2019.04.001). * The unavoidable necessity of considering temperature dependence of the liquid Gibbs energy of mixing for certain VLE data correlations. Fluid Phase Equilibria. 2018, 473, 17-31 (https://doi.org/10.1016/j.fluid.2018.05.025). * Should we trust all the published LLE correlation parameters in phase equilibria? Necessity of their Assessment Prior to Publication. Fluid Phase Equilibria. 2017, 433, 243-252 (http://dx.doi.org/10.1016/j.fluid.2016.11.009). * LLE data correlation using NRTL model for different types of binary systems: UCST, LCST and closed miscibility loops. Industrial & Engineering Chemistry Research. 2020, 59(17), 8469-8479 (https://doi.org/10.1021/acs.iecr.0c00141). * Checking Liquid-Liquid Critical Plait Conditions and their Application in Ternary Systems. Industrial & Engineering Chemistry Research. 2012, 51(13), 5098-5102 (h
- Published
- 2022
6. Increasing Spin of a B-Star During the Common Envelope Stage
- Author
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Staritsin, E. and Staritsin, E.
- Abstract
Context. In its evolution, the MWC 656 binary system, consisting of a Be star and a black hole, has gone through the common envelope stage. The O and B stars of the early spectral subclasses can be characterised by lower rotational velocities and increased binary frequency. The B star in the MWC 656 system may have undergone rapid rotation during the common envelope stage. Aims. We study the change in the B star's state of rotation due to an increase in its angular momentum during the common envelope stage and immediately afterwards. Methods. We performed one-dimensional numerical calculations of angular momentum transport in the interior of a slightly evolved star on the main sequence with a mass of 16 M⊙. Meridional circulation and shear turbulence are taken into account. Results. Due to the arrival of angular momentum through the star's surface, the velocity of the meridional circulation increases by more than six orders of magnitude. Meridional circulation is the main mechanism for the transport of angular momentum into the star's deep interior. The acquired angular momentum enters the convective core during the common envelope stage if the angular velocity of the accreted matter exceeds half the Kepler value. Conclusions. The star acquires a rotation typical of classical Be stars if the angular velocity of accreted matter rotation is close to the maximum possible value during the common envelope stage (∼80% of the Kepler value). © ESO 2021.
- Published
- 2021
7. GWTC-2: Compact Binary Coalescences Observed by LIGO and Virgo during the First Half of the Third Observing Run
- Author
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LIGO Scientific Collaboration, Virgo Collaboration, Abbott, R., Abbott, T.D., Abraham, S., Acernese, F., Ackley, K., Adams, A., Adams, C., Adhikari, R.X., Adya, V.B., Affeldt, Christoph, Agathos, M., Agatsuma, K., Aggarwal, N., Aguiar, O.D., Aiello, L., Ain, A., Ajith, P., Akcay, S., Allen, G., Allocca, A., Altin, P.A., Amato, A., Anand, S., Ananyeva, A., Anderson, S.B., Anderson, W.G., Angelova, S.V., Ansoldi, S., Antelis, J.M., Antier, S., Appert, S., Arai, K., Araya, M.C., Areeda, J.S., Arène, M., Arnaud, N., Aronson, S.M., Arun, K.G., Asali, Y., Ascenzi, S., Ashton, G., Aston, S.M., Astone, P., Aubin, F., Aufmuth, P., Aultoneal, K., Austin, C., Avendano, V., Babak, S., Badaracco, F., Bader, M.K.M., Bae, S., Baer, A.M., Bagnasco, S., Baird, J., Ball, M., Ballardin, G., Ballmer, S.W., Bals, A., Balsamo, A., Baltus, G., Banagiri, S., Bankar, D., Bankar, R.S., Barayoga, J.C., Barbieri, C., Barish, B.C., Barker, D., Barneo, P., Barnum, S., Barone, F., Barr, B., Barsotti, L., Barsuglia, M., Barta, D., Bartlett, J., Bartos, I., Bassiri, R., Basti, A., Bawaj, M., Bayley, J.C., Bazzan, M., Becher, B.R., Bécsy, B., Bedakihale, V.M., Bejger, M., Belahcene, I., Beniwal, D., Benjamin, M.G., Bennett, T.F., Bentley, J.D., Bergamin, F., Berger, B.K., Bergmann, G., Bernuzzi, S., Berry, C.P.L., Bersanetti, D., Bertolini, A., Betzwieser, J., Bhandare, R., Bhandari, A.V., Bhattacharjee, D., Bidler, J., Bilenko, I.A., Billingsley, G., Birney, R., Birnholtz, O., Biscans, S., Bischi, M., Biscoveanu, S., Bisht, A., Bitossi, M., Bizouard, M.-A., Blackburn, J.K., Blackman, J., Blair, C.D., Blair, D.G., Blair, R.M., Blanch, O., Bobba, F., Bode, N., Boer, M., Boetzel, Y., Bogaert, G., Boldrini, M., Bondu, F., Bonilla, E., Bonnand, R., Booker, P., Boom, B.A., Bork, R., Boschi, V., Bose, S., Bossilkov, V., Boudart, V., Bouffanais, Y., Bozzi, A., Bradaschia, C., Brady, P.R., Bramley, A., Branchesi, M., Brau, J.E., Breschi, M., Briant, T., Briggs, J.H., Brighenti, F., Brillet, A., Brinkmann, M., Brockill, P., Brooks, A.F., Brooks, J., Brown, D.D., Brunett, S., Bruno, G., Bruntz, R., Buikema, A., Bulik, T., Bulten, H.J., Buonanno, A., Buscicchio, R., Buskulic, D., Byer, R.L., Cabero, M., Cadonati, L., Caesar, M., Cagnoli, G., Cahillane, C., Calderón, Bustillo, J., Callaghan, J.D., Callister, T.A., Calloni, E., Camp, J.B., Canepa, M., Cannon, K.C., Cao, H., Cao, J., Carapella, G., Carbognani, F., Carney, M.F., Carpinelli, M., Carullo, G., Carver, T.L., Casanueva Diaz, J., Casentini, C., Caudill, S., Cavaglià, M., Cavalier, F., Cavalieri, R., Cella, G., Cerdá-Durán, P., Cesarini, E., Chaibi, W., Chakravarti, K., Chan, C.-L., Chan, C., Chandra, K., Chanial, P., Chao, S., Charlton, P., Chase, E.A., Chassande-Mottin, E., Chatterjee, D., Chattopadhyay, D., Chaturvedi, M., Chatziioannou, K., Chen, A., Chen, H.Y., Chen, X., Chen, Y., Cheng, H.-P., Cheong, C.K., Chia, H.Y., Chiadini, F., Chierici, R., Chincarini, A., Chiummo, A., Cho, G., Cho, H.S., Cho, M., Choate, S., Christensen, N., Chu, Q., Chua, S., Chung, K.W., Chung, S., Ciani, G., Ciecielag, P., Cieślar, M., Cifaldi, M., Ciobanu, A.A., Ciolfi, R., Cipriano, F., Cirone, A., Clara, F., Clark, E.N., Clark, J.A., Clarke, L., Clearwater, P., Clesse, S., Cleva, F., Coccia, E., Cohadon, P.-F., Cohen, D.E., Colleoni, M., Collette, C.G., Collins, C., Colpi, M., Constancio, M. Jr., Conti, L., Cooper, S.J., Corban, P., Corbitt, T.R., Cordero-Carrión, I., Corezzi, S., Corley, K.R., Cornish, N., Corre, D., Corsi, A., Cortese, S., Costa, C.A., Cotesta, R., Coughlin, M.W., Coughlin, S.B., Coulon, J.-P., Countryman, S.T., Cousins, B., Couvares, P., Covas, P.B., Coward, D.M., Cowart, M.J., Coyne, D.C., Coyne, R., Creighton, J.D.E., Creighton, T.D., Croquette, M., Crowder, S.G., Cudell, J.R., Cullen, T.J., Cumming, A., Cummings, R., Cunningham, L., Cuoco, E., Curyło, M., Canton, T.D., Dálya, G., Dana, A., Daneshgaranbajastani, L.M., D'Angelo, B., Danila, B., Danilishin, S.L., D'Antonio, S., Danzmann, Karsten, Darsow-Fromm, C., Dasgupta, A., Datrier, L.E.H., Dattilo, V., Dave, I., Davier, M., Davies, G.S., Davis, D., Daw, E.J., Dean, R., Debra, D., Deenadayalan, M., Degallaix, J., De Laurentis, M., Deléglise, S., Del Favero, V., De Lillo, F., De Lillo, N., Del Pozzo, W., Demarchi, L.M., De Matteis, F., D'Emilio, V., Demos, N., Denker, T., Dent, T., Depasse, A., De Pietri, R., De Rosa, R., De Rossi, C., Desalvo, R., De Varona, O., Dhurandhar, S., Díaz, M.C., Diaz-Ortiz, M. Jr., Didio, N.A., Dietrich, T., Di Fiore, L., Difronzo, C., Di Giorgio, C., Di Giovanni, F., Di Giovanni, M., Di Girolamo, T., Di Lieto, A., Ding, B., Di Pace, S., Di Palma, I., Di Renzo, F., Divakarla, A.K., Dmitriev, A., Doctor, Z., D'Onofrio, L., Donovan, F., Dooley, K.L., Doravari, S., Dorrington, I., Downes, T.P., Drago, M., Driggers, J.C., Du, Z., Ducoin, J.-G., Dupej, P., Durante, O., D'Urso, D., Duverne, P.-A., Dwyer, S.E., Easter, P.J., Eddolls, G., Edelman, B., Edo, T.B., Edy, O., Effler, A., Eichholz, J., Eikenberry, S.S., Eisenmann, M., Eisenstein, R.A., Ejlli, A., Errico, L., Essick, R.C., Estellés, H., Estevez, D., Etienne, Z.B., Etzel, T., Evans, M., Evans, T.M., Ewing, B.E., Fafone, V., Fair, H., Fairhurst, S., Fan, X., Farah, A.M., Farinon, S., Farr, B., Farr, W.M., Fauchon-Jones, E.J., Favata, M., Fays, M., Fazio, M., Feicht, J., Fejer, M.M., Feng, F., Fenyvesi, E., Ferguson, D.L., Fernandez-Galiana, A., Ferrante, I., Ferreira, T.A., Fidecaro, F., Figura, P., Fiori, I., Fiorucci, D., Fishbach, M., Fisher, R.P., Fishner, J.M., Fittipaldi, R., Fitz-Axen, M., Fiumara, V., Flaminio, R., Floden, E., Flynn, E., Fong, H., Font, J.A., Forsyth, P.W.F., Fournier, J.-D., Frasca, S., Frasconi, F., Frei, Z., Freise, A., Frey, R., Frey, V., Fritschel, P., Frolov, V.V., Fronzé, G.G., Fulda, P., Fyffe, M., Gabbard, H.A., Gadre, B.U., Gaebel, S.M., Gair, J.R., Gais, J., Galaudage, S., Gamba, R., Ganapathy, D., Ganguly, A., Gaonkar, S.G., Garaventa, B., García-Quirós, C., Garufi, F., Gateley, B., Gaudio, S., Gayathri, V., Gemme, G., Gennai, A., George, D., George, J., George, R.N., Gergely, L., Ghonge, S., Ghosh, A., Ghosh, S., Giacomazzo, B., Giacoppo, L., Giaime, J.A., Giardina, K.D., Gibson, D.R., Gier, C., Gill, K., Giri, P., Glanzer, J., Gleckl, A.E., Godwin, P., Goetz, E., Goetz, R., Gohlke, N., Goncharov, B., González, G., Gopakumar, A., Gossan, S.E., Gosselin, M., Gouaty, R., Grace, B., Grado, A., Granata, M., Granata, V., Grant, A., Gras, S., Grassia, P., Gray, C., Gray, R., Greco, G., Green, A.C., Green, R., Gretarsson, E.M., Griggs, H.L., Grignani, G., Grimaldi, A., Grimes, E., Grimm, S.J., Grote, H., Grunewald, S., Gruning, P., Guerrero, J.G., Guidi, G.M., Guimaraes, A.R., Guixé, G., Gulati, H.K., Guo, Y., Gupta, A., Gupta, P., Gustafson, E.K., Gustafson, R., Guzman, F., Haegel, L., Halim, O., Hall, E.D., Hamilton, E.Z., Hammond, G., Haney, M., Hanke, M.M., Hanks, J., Hanna, C., Hannam, M.D., Hannuksela, O.A., Hannuksela, O., Hansen, H., Hansen, T.J., Hanson, J., Harder, T., Hardwick, T., Haris, K., Harms, J., Harry, G.M., Harry, I.W., Hartwig, D., Hasskew, R.K., Haster, C.-J., Haughian, K., Hayes, F.J., Healy, J., Heidmann, A., Heintze, M.C., Heinze, J., Heinzel, J., Heitmann, H., Hellman, F., Hello, P., Helmling-Cornell, A.F., Hemming, G., Hendry, M., Heng, I.S., Hennes, E., Hennig, J., Hennig, M.H., Hernandez Vivanco, F., Heurs, Michèle, Hild, S., Hill, P., Hines, A.S., Hochheim, S., Hofgard, E., Hofman, D., Hohmann, J.N., Holgado, A.M., Holland, N.A., Hollows, I.J., Holmes, Z.J., Holt, K., Holz, D.E., Hopkins, P., Horst, C., Hough, J., Howell, E.J., Hoy, C.G., Hoyland, D., Huang, Y., Hübner, M.T., Huddart, A.D., Huerta, E.A., Hughey, B., Hui, V., Husa, S., Huttner, S.H., Hutzler, B.M., Huxford, R., Huynh-Dinh, T., Idzkowski, B., Iess, A., Imperato, S., Inchauspe, H., Ingram, C., Intini, G., Isi, M., Iyer, B.R., Jaberianhamedan, V., Jacqmin, T., Jadhav, S.J., Jadhav, S.P., James, A.L., Jani, K., Janssens, K., Janthalur, N.N., Jaranowski, P., Jariwala, D., Jaume, R., Jenkins, A.C., Jeunon, M., Jiang, J., Johns, G.R., Johnson-Mcdaniel, N.K., Jones, A.W., Jones, D.I., Jones, J.D., Jones, P., Jones, R., Jonker, R.J.G., Ju, L., Junker, J., Kalaghatgi, C.V., Kalogera, V., Kamai, B., Kandhasamy, S., Kang, G., Kanner, J.B., Kapadia, S.J., Kapasi, D.P., Karathanasis, C., Karki, S., Kashyap, R., Kasprzack, M., Kastaun, W., Katsanevas, S., Katsavounidis, E., Katzman, W., Kawabe, K., Kéfélian, F., Keitel, D., Key, J.S., Khadka, S., Khalili, F.Y., Khan, I., Khan, S., Khazanov, E.A., Khetan, N., Khursheed, M., Kijbunchoo, N., Kim, C., Kim, G.J., Kim, J.C., Kim, K., Kim, W.S., Kim, Y.-M., Kimball, C., King, P.J., Kinley-Hanlon, M., Kirchhoff, R., Kissel, J.S., Kleybolte, L., Klimenko, S., Knowles, T.D., Knyazev, E., Koch, P., Koehlenbeck, S.M., Koekoek, G., Koley, S., Kolstein, M., Komori, K., Kondrashov, V., Kontos, A., Koper, N., Korobko, M., Korth, W.Z., Kovalam, M., Kozak, D.B., Krämer, C., Kringel, V., Krishnendu, N.V., Królak, A., Kuehn, G., Kumar, A., Kumar, P., Kumar, R., Kuns, K., Kwang, S., Lackey, B.D., Laghi, D., Lalande, E., Lam, T.L., Lamberts, A., Landry, M., Lane, B.B., Lang, R.N., Lange, J., Lantz, B., Lanza, R.K., La Rosa, I., Lartaux-Vollard, A., Lasky, P.D., Laxen, M., Lazzarini, A., Lazzaro, C., Leaci, P., Leavey, S., Lecoeuche, Y.K., Lee, H.M., Lee, H.W., Lee, J., Lee, K., Lehmann, J., Leon, E., Leroy, N., Letendre, N., Levin, Y., Li, A., Li, J., Li, K.J.L., Li, T.G.F., Li, X., Linde, F., Linker, S.D., Linley, J.N., Littenberg, T.B., Liu, J., Liu, X., Llorens-Monteagudo, M., Lo, R.K.L., Lockwood, A., London, L.T., Longo, A., Lorenzini, M., Loriette, V., Lormand, M., Losurdo, G., Lough, J.D., Lousto, C.O., Lovelace, G., Lück, H., Lumaca, D., Lundgren, A.P., Ma, Y., Macas, R., Macinnis, M., Macleod, D.M., Macmillan, I.A.O., Macquet, A., Magaña Hernandez, I., Magaña-Sandoval, F., Magazzù, C., Magee, R.M., Majorana, E., Maksimovic, I., Maliakal, S., Malik, A., Man, N., Mandic, V., Mangano, V., Mansell, G.L., Manske, M., Mantovani, M., Mapelli, M., Marchesoni, F., Marion, F., Márka, S., Márka, Z., Markakis, C., Markosyan, A.S., Markowitz, A., Maros, E., Marquina, A., Marsat, S., Martelli, F., Martin, I.W., Martin, R.M., Martinez, M., Martinez, V., Martynov, D.V., Masalehdan, H., Mason, K., Massera, E., Masserot, A., Massinger, T.J., Masso-Reid, M., Mastrogiovanni, S., Matas, A., Mateu-Lucena, M., Matichard, F., Matiushechkina, M., Mavalvala, N., Maynard, E., 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Holgado, A.M., Holland, N.A., Hollows, I.J., Holmes, Z.J., Holt, K., Holz, D.E., Hopkins, P., Horst, C., Hough, J., Howell, E.J., Hoy, C.G., Hoyland, D., Huang, Y., Hübner, M.T., Huddart, A.D., Huerta, E.A., Hughey, B., Hui, V., Husa, S., Huttner, S.H., Hutzler, B.M., Huxford, R., Huynh-Dinh, T., Idzkowski, B., Iess, A., Imperato, S., Inchauspe, H., Ingram, C., Intini, G., Isi, M., Iyer, B.R., Jaberianhamedan, V., Jacqmin, T., Jadhav, S.J., Jadhav, S.P., James, A.L., Jani, K., Janssens, K., Janthalur, N.N., Jaranowski, P., Jariwala, D., Jaume, R., Jenkins, A.C., Jeunon, M., Jiang, J., Johns, G.R., Johnson-Mcdaniel, N.K., Jones, A.W., Jones, D.I., Jones, J.D., Jones, P., Jones, R., Jonker, R.J.G., Ju, L., Junker, J., Kalaghatgi, C.V., Kalogera, V., Kamai, B., Kandhasamy, S., Kang, G., Kanner, J.B., Kapadia, S.J., Kapasi, D.P., Karathanasis, C., Karki, S., Kashyap, R., Kasprzack, M., Kastaun, W., Katsanevas, S., Katsavounidis, E., Katzman, W., Kawabe, K., Kéfélian, F., Keitel, D., Key, 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D., Mukherjee, S., Mukund, N., Mullavey, A., Munch, J., Muñiz, E.A., Murray, P.G., Nadji, S.L., Nagar, A., Nardecchia, I., Naticchioni, L., Nayak, R.K., Neil, B.F., Neilson, J., Nelemans, G., Nelson, T.J.N., Nery, M., Neunzert, A., Nitz, A.H., Ng, K.Y., Ng, S., Nguyen, C., Nguyen, P., Nguyen, T., Nichols, S.A., Nissanke, S., Nocera, F., Noh, M., North, C., Nothard, D., Nuttall, L.K., Oberling, J., O'Brien, B.D., O'Dell, J., Oganesyan, G., Ogin, G.H., Oh, J.J., Oh, S.H., Ohme, F., Ohta, H., Okada, M.A., Olivetto, C., Oppermann, P., Oram, R.J., O'Reilly, B., Ormiston, R.G., Ortega, L.F., O'Shaughnessy, R., Ossokine, S., Osthelder, C., Ottaway, D.J., Overmier, H., Owen, B.J., Pace, A.E., Pagano, G., Page, M.A., Pagliaroli, G., Pai, A., Pai, S.A., Palamos, J.R., Palashov, O., Palomba, C., Pan, H., Panda, P.K., Pang, T.H., Pankow, C., Pannarale, F., Pant, B.C., Paoletti, F., Paoli, A., Paolone, A., Parker, W., Pascucci, D., Pasqualetti, A., Passaquieti, R., Passuello, D., Patel, M., Patricelli, B., Payne, E., Pechsiri, T.C., Pedraza, M., Pegoraro, M., Pele, A., Penn, S., Perego, A., Perez, C.J., Périgois, C., Perreca, A., Perriès, S., Petermann, J., Petterson, D., Pfeiffer, H.P., Pham, K.A., Phukon, K.S., Piccinni, O.J., Pichot, M., Piendibene, M., Piergiovanni, F., Pierini, L., Pierro, V., Pillant, G., Pilo, F., Pinard, L., Pinto, I.M., Piotrzkowski, K., Pirello, M., Pitkin, M., Placidi, E., Plastino, W., Pluchar, C., Poggiani, R., Polini, E., Pong, D.Y.T., Ponrathnam, S., Popolizio, P., Porter, E.K., Poverman, A., Powell, J., Pracchia, M., Prajapati, A.K., Prasai, K., Prasanna, R., Pratten, G., Prestegard, T., Principe, M., Prodi, G.A., Prokhorov, L., Prosposito, P., Prudenzi, L., Puecher, A., Punturo, M., Puosi, F., Puppo, P., Pürrer, M., Qi, H., Quetschke, V., Quinonez, P.J., Quitzow-James, R., Raab, F.J., Raaijmakers, G., Radkins, H., Radulesco, N., Raffai, P., Rafferty, H., Rail, S.X., Raja, S., Rajan, C., Rajbhandari, B., Rakhmanov, M., Ramirez, K.E., Ramirez, T.D., Ramos-Buades, A., Rana, J., Rao, K., Rapagnani, P., Rapol, U.D., Ratto, B., Raymond, V., Razzano, M., Read, J., Regimbau, T., Rei, L., Reid, S., Reitze, D.H., Rettegno, P., Ricci, F., Richardson, C.J., Richardson, J.W., Richardson, L., Ricker, P.M., Riemenschneider, G., Riles, K., Rizzo, M., Robertson, N.A., Robinet, F., Rocchi, A., Rocha, J.A., Rodriguez, S., Rodriguez-Soto, R.D., Rolland, L., Rollins, J.G., Roma, V.J., Romanelli, M., Romano, R., Romel, C.L., Romero, A., Romero-Shaw, I.M., Romie, J.H., Ronchini, S., Rose, C.A., Rose, D., Rose, K., Rosell, M.J.B., Rosińska, D., Rosofsky, S.G., Ross, M.P., Rowan, S., Rowlinson, S.J., Roy, S., Ruggi, P., Ryan, K., Sachdev, S., Sadecki, T., Sadiq, J., Sakellariadou, M., Salafia, O.S., Salconi, L., Saleem, M., Samajdar, A., Sanchez, E.J., Sanchez, J.H., Sanchez, L.E., Sanchis-Gual, N., Sanders, J.R., Sandles, L., Santiago, K.A., Santos, E., Saravanan, T.R., Sarin, N., Sassolas, B., Sathyaprakash, B.S., Sauter, O., Savage, R.L., Savant, V., Sawant, D., Sayah, S., Schaetzl, D., Schale, P., Scheel, M., Scheuer, J., Schindler-Tyka, A., Schmidt, P., Schnabel, R., Schofield, R.M.S., Schönbeck, A., Schreiber, E., Schulte, B.W., Schutz, B.F., Schwarm, O., Schwartz, E., Scott, J., Scott, S.M., Seglar-Arroyo, M., Seidel, E., Sellers, D., Sengupta, A.S., Sennett, N., Sentenac, D., Sequino, V., Sergeev, A., Setyawati, Y., Shaffer, T., Shahriar, M.S., Sharifi, S., Sharma, A., Sharma, P., Shawhan, P., Shen, H., Shikauchi, M., Shink, R., Shoemaker, D.H., Shoemaker, D.M., Shukla, K., Shyamsundar, S., Sieniawska, M., Sigg, D., Singer, L.P., Singh, D., Singh, N., Singha, A., Singhal, A., Sintes, A.M., Sipala, V., Skliris, V., Slagmolen, B.J.J., Slaven-Blair, T.J., Smetana, J., Smith, J.R., Smith, R.J.E., Somala, S.N., Son, E.J., Soni, K., Soni, S., Sorazu, B., Sordini, V., Sorrentino, F., Sorrentino, N., Soulard, R., Souradeep, T., Sowell, E., Spencer, A.P., Spera, M., Srivastava, A.K., Srivastava, V., Staats, K., 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F., Wen, L., Weßels, P., Westhouse, J.W., Wette, K., Whelan, J.T., White, D.D., White, L.V., Whiting, B.F., Whittle, C., Wilken, D.M., Williams, D., Williams, M.J., Williamson, A.R., Willis, J.L., Willke, B., Wilson, D.J., Wimmer, M.H., Winkler, W., Wipf, C.C., Woan, G., Woehler, J., Wofford, J.K., Wong, I.C.F., Wrangel, J., Wright, J.L., Wu, D.S., Wysocki, D.M., Xiao, L., Yamamoto, H., Yang, L., Yang, Y., Yang, Z., Yap, M.J., Yeeles, D.W., Yoon, A., Yu, H., Yuen, S.H.R., Zadrożny, A., Zanolin, M., Zelenova, T., Zendri, J.-P., Zevin, M., Zhang, J., Zhang, L., Zhang, R., Zhang, T., Zhao, C., Zhao, G., Zheng, Y., Zhou, M., Zhou, Z., Zhu, X.J., Zimmerman, A.B., Zlochower, Y., Zucker, M.E., and Zweizig, J.
- Abstract
We report on gravitational-wave discoveries from compact binary coalescences detected by Advanced LIGO and Advanced Virgo in the first half of the third observing run (O3a) between 1 April 2019 15:00 UTC and 1 October 2019 15:00 UTC. By imposing a false-alarm-rate threshold of two per year in each of the four search pipelines that constitute our search, we present 39 candidate gravitational-wave events. At this threshold, we expect a contamination fraction of less than 10%. Of these, 26 candidate events were reported previously in near-real time through gamma-ray coordinates network notices and circulars; 13 are reported here for the first time. The catalog contains events whose sources are black hole binary mergers up to a redshift of approximately 0.8, as well as events whose components cannot be unambiguously identified as black holes or neutron stars. For the latter group, we are unable to determine the nature based on estimates of the component masses and spins from gravitational-wave data alone. The range of candidate event masses which are unambiguously identified as binary black holes (both objects ≥3 Mo˙) is increased compared to GWTC-1, with total masses from approximately 14 Mo˙ for GW190924_021846 to approximately 150 Mo˙ for GW190521. For the first time, this catalog includes binary systems with significantly asymmetric mass ratios, which had not been observed in data taken before April 2019. We also find that 11 of the 39 events detected since April 2019 have positive effective inspiral spins under our default prior (at 90% credibility), while none exhibit negative effective inspiral spin. Given the increased sensitivity of Advanced LIGO and Advanced Virgo, the detection of 39 candidate events in approximately 26 weeks of data (approximately 1.5 per week) is consistent with GWTC-1. © 2021 authors. Published by the American Physical Society.
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- 2021
8. Population synthesis study of the Gaia white dwarf population
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Universitat Politècnica de Catalunya. Departament de Física, Torres Gil, Santiago, Rebassa Mansergas, Alberto, Ferrer i Burjachs, Aina, Universitat Politècnica de Catalunya. Departament de Física, Torres Gil, Santiago, Rebassa Mansergas, Alberto, and Ferrer i Burjachs, Aina
- Abstract
We conduct a population synthesis study of the white dwarf population within 100pc from the Sun. Such simulations are based on a detailed Monte Carlo code, which provides synthetic samples of both single and binary stars for different input parameters. Synthetic outcomes are compared with observed data obtained from the recent Gaia mission in its early data release 3. In a first step we compute the outcome of the synthetic sample in the Gaia magnitude system, introduce the photometric and astrometric errors according to Gaia prescriptions and apply the corresponding selection cuts. Then we analyze the general statistical properties, such as the number-counts and percentages of the complete range of sub-populations which contain at least one white dwarf component, i.e. single and merger white dwarfs, white dwarf plus main sequence binaries, and double white dwarfs; in its two modalities, resolved and unresolved systems. The comparison between the observed and the several outcomes of the simulations are mainly based of the fractions of the different sub-samples and their distribution within the Hertzsrpung-Russell diagram. To assist the statistical analysis of observed and synthetic distributions we introduce a generalization of the Kolmogorov-Smirnov test applied to two-dimensional density distributions. Our analysis reveals that any of the models analyzed in this project perfectly agrees with the observed percentages of all the different sub-populations. However, a flat or even a decreasing initial mass ratio distribution seems to be a reasonable first guess, while an increasing relation can be discarded. Further work is needed expanding the number of models and input parameters., Realizamos un estudio de síntesis de población de la población de enanas blancas a menos de 100pcs del sol. Estas simulaciones se basan en un detallado código de Monte Carlo, que proporciona muestras sintéticas de estrellas simples y binarias para diferentes parámetros de entrada. Los resultados sintéticos se comparan con los datos observados obtenidos de la reciente misión de Gaia en su early data release 3. En un primer paso, calculamos el resultado de la muestra sintética al sistema de magnitud de Gaia, introducimos los errores fotométricos y astrométricos según las prescripciones de Gaia y aplicamos los cortes de selección correspondientes. A continuación, analizamos las propiedades estadísticas generales, como los números y porcentajes del rango completo de subpoblaciones que contienen al menos una componente de enana blanca, es decir, enanas blancas simples y de mergers, binarias de enana blanca más secuencia principal y dobles enanas blancas; en sus dos modalidades, sistemas resueltos y no resueltos. La comparación entre los resultados observados y los de las diversas simulaciones se basa principalmente en las fracciones de las diferentes submuestras y su distribución dentro del diagrama de Hertzsrpung-Russell. Para ayudar al análisis estadístico de las distribuciones observadas y sintéticas, introducimos una generalización de la prueba de Kolmogorov-Smirnov aplicada a distribuciones de densidad bidimensionales. Nuestro análisis revela que ninguno de los modelos analizados en este proyecto coincide perfectamente con los porcentajes observados de todas las diferentes subpoblaciones. Sin embargo, una relación de distribución inicial de la masa plana, o incluso una decreciente, parece ser una primera suposición razonable, mientras que se puede descartar una relación creciente. Es necesario continuar trabajando ampliando el número de modelos y parámetros de entrada., Realitzem un estudi de síntesi de població de la població de nanes blanques a menys de 100pc del Sol. Aquestes simulacions es basen en un detallat codi de Monte Carlo, que proporciona mostres sintètiques d'estrelles simples i binàries per a diferents paràmetres d'entrada. Els resultats sintètics es comparen amb les dades observades obtingudes de la recent missió de Gaia en la seu early data release 3. En un primer pas, calculem el resultat de la mostra sintètica al sistema de magnitud de Gaia, introduïm la errors fotomètrics i astromètrics segons les prescripcions de Gaia i apliquem els talls de selecció corresponents. A continuació, analitzem les propietats estadístiques generals, com ara els nombres i percentatges del rang complet de subpoblacions que contenen almenys un component de nana blanca, és a dir, nanes blanques simples i de mergers, binàries de nana blanca més seqüència principal i doble nanes blanques; en les seves dues modalitats, sistemes resolts i no resolts. La comparació entre els resultats observats i els de les diverses simulacions es basa principalment en les fraccions de les diferents submostres i la seva distribució dins del diagrama de Hertzsrpung-Russell. Per ajudar a l'anàlisi estadística de les distribucions observades i sintètiques, introduïm una generalització de la prova de Kolmogorov-Smirnov aplicada a distribucions de densitat bidimensionals. La nostra anàlisi revela que cap dels models analitzats en aquest projecte coincideix perfectament amb els percentatges observats de totes les diferents subpoblacions. No obstant això, una relació de distribució inicial de la massa plana, o fins i tot una decreixent, sembla ser una primera suposició raonable, mentre que es pot descartar una relació creixent. Es necessari continuar treballant ampliant el nombre de models i paràmetres d'entrada.
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- 2021
9. Predicting ductility in quaternary B2-like alloys
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Hwang, Emily, Cuddy, Emma, Lin, Julianne, Kaufman, Jonas L., Shaw, Adam, Conway, Patrick L. J., Pribram-Jones, Aurora, Laws, Kevin J., Bassman, Lori, Hwang, Emily, Cuddy, Emma, Lin, Julianne, Kaufman, Jonas L., Shaw, Adam, Conway, Patrick L. J., Pribram-Jones, Aurora, Laws, Kevin J., and Bassman, Lori
- Abstract
Although intermetallics with a B2-type crystal structure are typically brittle, a class of B2 intermetallics that demonstrates unusually high ductility has been reported. A set of recently developed B2-like quaternary precious metal-rare earth alloys also includes compositions with significant ductility. To predict ductility in these systems, we have adapted a computational energy-based metric based on slip systems and relative stability of planar defects, developed to predict ductility in B2 binary systems, for use with quaternary B2-like alloys. The computational metric successfully predicts the experimentally-determined ductility or brittleness of 15 B2-like quaternary precious metal-rare earth and refractory alloys.
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- 2021
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10. Liquid–Liquid Equilibrium Data Correlation Using NRTL Model for Different Types of Binary Systems: Upper Critical Solution Temperature, Lower Critical Solution Temperature, and Closed Miscibility Loops
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Universidad de Alicante. Departamento de Ingeniería Química, Universidad de Alicante. Instituto Universitario de Ingeniería de los Procesos Químicos, Olaya, Maria del Mar, Carbonell Hermida, Paloma, Trives, Marina, Labarta, Juan A., Marcilla, Antonio, Universidad de Alicante. Departamento de Ingeniería Química, Universidad de Alicante. Instituto Universitario de Ingeniería de los Procesos Químicos, Olaya, Maria del Mar, Carbonell Hermida, Paloma, Trives, Marina, Labarta, Juan A., and Marcilla, Antonio
- Abstract
In this work, liquid–liquid equilibrium (LLE) data at different temperatures have been correlated for 30 binary systems that presented different miscibility behaviors: 15 upper critical solution temperature (UCST), 5 lower critical solution temperature (LCST), and 10 closed loop LLE region systems. The NRTL model along with an expression frequently used in the literature for the temperature dependence in the binary interaction has allowed an acceptable fitting of all the systems. The parameters obtained have been validated by the inspection of the Gibbs energy of mixing function regarding the fulfillment of the Gibbs common tangent equilibrium condition, and also by the stability of the solution to avoid possible metastable equilibrium solutions. The critical solution temperatures have been calculated by extrapolation using the NRTL parameters obtained for all selected binary systems. Moreover, the NRTL parameter values have been analyzed using some proposed representations that also include the boundary curve between miscible (L) and partially miscible (LLE) regions. These graphical representations are useful because they show the parameter value requirements to reproduce UCST, LCST, or closed loop behaviors.
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- 2020
11. The shape of dendritic tips
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Alexandrov, D. V., Galenko, P. K., Alexandrov, D. V., and Galenko, P. K.
- Abstract
The present article is focused on the shapes of dendritic tips occurring in undercooled binary systems in the absence of convection. A circular/globular shape appears in limiting cases of small and large Péclet numbers. A parabolic/paraboloidal shape describes the tip regions of dendrites whereas a fractional power law defines a shape behind their tips in the case of low/moderate Péclet number. The parabolic/paraboloidal and fractional power law shapes are sewed together in the present work to describe the dendritic shape in a broader region adjacent to the dendritic tip. Such a generalized law is in good agreement with the parabolic/paraboloidal and fractional power laws of dendritic shapes. A special case of the angled dendrite is considered and analysed in addition. The obtained results are compared with previous experimental data and the results of numerical simulations on dendritic growth. © 2020 The Author(s) Published by the Royal Society. All rights reserved.
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- 2020
12. Liquid–Liquid Equilibrium Data Correlation Using NRTL Model for Different Types of Binary Systems: Upper Critical Solution Temperature, Lower Critical Solution Temperature, and Closed Miscibility Loops
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Universidad de Alicante. Departamento de Ingeniería Química, Universidad de Alicante. Instituto Universitario de Ingeniería de los Procesos Químicos, Olaya, Maria del Mar, Carbonell Hermida, Paloma, Trives, Marina, Labarta, Juan A., Marcilla, Antonio, Universidad de Alicante. Departamento de Ingeniería Química, Universidad de Alicante. Instituto Universitario de Ingeniería de los Procesos Químicos, Olaya, Maria del Mar, Carbonell Hermida, Paloma, Trives, Marina, Labarta, Juan A., and Marcilla, Antonio
- Abstract
In this work, liquid–liquid equilibrium (LLE) data at different temperatures have been correlated for 30 binary systems that presented different miscibility behaviors: 15 upper critical solution temperature (UCST), 5 lower critical solution temperature (LCST), and 10 closed loop LLE region systems. The NRTL model along with an expression frequently used in the literature for the temperature dependence in the binary interaction has allowed an acceptable fitting of all the systems. The parameters obtained have been validated by the inspection of the Gibbs energy of mixing function regarding the fulfillment of the Gibbs common tangent equilibrium condition, and also by the stability of the solution to avoid possible metastable equilibrium solutions. The critical solution temperatures have been calculated by extrapolation using the NRTL parameters obtained for all selected binary systems. Moreover, the NRTL parameter values have been analyzed using some proposed representations that also include the boundary curve between miscible (L) and partially miscible (LLE) regions. These graphical representations are useful because they show the parameter value requirements to reproduce UCST, LCST, or closed loop behaviors.
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- 2020
13. A first-principles based description of the Hf-Ni system supported by high-temperature synchrotron experiments
- Author
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Ross, A. J., Gheno, T., Ray, P. K., Kramer, M. J., Liu, X. L., Lindwall, Greta, Zhou, B., Shang, S. L., Gleeson, B., Liu, Z. -K, Ross, A. J., Gheno, T., Ray, P. K., Kramer, M. J., Liu, X. L., Lindwall, Greta, Zhou, B., Shang, S. L., Gleeson, B., and Liu, Z. -K
- Abstract
Hf-Ni is an important binary system for high temperature alloys and shape memory alloys which has been investigated several times in the literature but often using samples of Hf contaminated by Zr. The thermodynamics of this system are remodeled in this work based on first-principles calculations and additional experiments using Hf with relatively low Zr contamination (0.25 wt. %). Diffusion couples in the Ni-rich portion of the Hf-Ni system heat treated at 1173, 1273 and 1373 K are used to measure phase stability and Hf solubility in the fcc phase. The solubility observed in fcc Ni from Ni/Ni50Hf50 (at.%) diffusion couples is larger than that observed in previous experiments. These results are the only source fit to during modeling of the fcc solubility to mitigate effects from Zr contamination. Data in the literature suggests that the high temperature crystal structure of the B33 NiHf phase is, in fact, the B2 structure. High temperature synchrotron measurements provide confirmation of this crystal structure. Modeling of the B2 phase was aided by first-principles calculations using special quasi-random structures (SQS). The present CALPHAD model will prove useful when designing shape memory alloys containing Hf and when modeling the Hf activity in Ni-base high temperature alloys., Export Date: 22 October 2018; Article; CODEN: THACA; Correspondence Address: Ross, A.J.; Department of Materials Science and Engineering, The Pennsylvania State UniversityUnited States; email: austinross42@gmail.com; Funding details: ACI-1053575, NSF, National Science Foundation; Funding details: DE-FE0031553, DOE, U.S. Department of Energy; Funding details: DE-FE0024056, DOE, U.S. Department of Energy; Funding details: PSU, Pennsylvania State University; Funding details: DE-AC02-05CH11231; Funding text: This work was funded by the U.S. Department of Energy through Grant DE-FE0024056 and DE-FE0031553. First-principles calculations were carried out partially on the LION clusters supported by the Materials Simulation Center and the Research Computing and Cyber infrastructure unit at the Pennsylvania State University, partially on the resources of NERSC supported by the Office of Science of the U.S. DOE under Contract No. DE-AC02-05CH11231, and partially on the resources of XSEDE supported by National Science Foundation with Grant ACI-1053575. Appendix A. QC 20181113
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- 2018
- Full Text
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14. Search for Subsolar-Mass Ultracompact Binaries in Advanced LIGO's First Observing Run
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Abbott, B.P., Abbott, R., Abbott, T.D., Acernese, F., Ackley, K., Adams, C., Adams, T., Addesso, P., Adhikari, R.X., Adya, V.B., Affeldt, C., Agarwal, B., Agathos, M., Agatsuma, K., Aggarwal, N., Aguiar, O.D., Aiello, L., Ain, A., Ajith, P., Allen, B., Allen, G., Allocca, A., Aloy, M.A., Altin, P.A., Amato, A., Ananyeva, A., Anderson, S.B., Anderson, W.G., Angelova, S.V., Antier, S., Appert, S., Arai, K., Araya, M.C., Areeda, J.S., Arène, M., Arnaud, N., Arun, K.G., Ascenzi, S., Ashton, G., Ast, M., Aston, S.M., Astone, P., Atallah, D.V., Aubin, F., Aufmuth, P., Aulbert, C., AultONeal, K., Austin, C., Avila-Alvarez, A., Babak, S., Bacon, P., Badaracco, F., Bader, M.K.M., Bae, S., Baker, P.T., Baldaccini, F., Ballardin, G., Ballmer, S.W., Banagiri, S., Barayoga, J.C., Barclay, S.E., Barish, B.C., Barker, D., Barkett, K., Barnum, S., Barone, F., Barr, B., Barsotti, L., Barsuglia, M., Barta, D., Bartlett, J., Bartos, I., Bassiri, R., Basti, A., Batch, J.C., Bawaj, M., Bayley, J.C., Bazzan, M., Bécsy, B., Beer, C., Bejger, M., Belahcene, I., Bell, A.S., Beniwal, D., Bensch, M., Berger, B.K., Bergmann, G., Bernuzzi, S., Bero, J.J., Berry, C.P.L., Bersanetti, D., Bertolini, A., Betzwieser, J., Bhandare, R., Bilenko, I.A., Bilgili, S.A., Billingsley, G., Billman, C.R., Birch, J., Birney, R., Birnholtz, O., Biscans, S., Biscoveanu, S., Bisht, A., Bitossi, M., Bizouard, M.A., Blackburn, J.K., Blackman, J., Blair, C.D., Blair, D.G., Blair, R.M., Bloemen, S., Bock, O., Bode, N., Boer, M., Boetzel, Y., Bogaert, G., Bohe, A., Bondu, F., Bonilla, E., Bonnand, R., Booker, P., Boom, B.A., Booth, C.D., Bork, R., Boschi, V., Bose, S., Bossie, K., Bossilkov, V., Bosveld, J., Bouffanais, Y., Bozzi, A., Bradaschia, C., Brady, P.R., Bramley, A., Branchesi, M., Brau, J.E., Briant, T., Brighenti, F., Brillet, A., Brinkmann, M., Brisson, V., Brockill, P., Brooks, A.F., Brown, D.D., Brunett, S., Buchanan, C.C., Buikema, A., Bulik, T., Bulten, H.J., Buonanno, A., Buskulic, D., Buy, C., Byer, R.L., Cabero, M., Cadonati, L., Cagnoli, G., Cahillane, C., Calderón.Bustillo, J., Callister, T.A., Calloni, E., Camp, J.B., Canepa, M., Canizares, P., Cannon, K.C., Cao, H., Cao, J., Capano, C.D., Capocasa, E., Carbognani, F., Caride, S., Carney, M.F., Casanueva.Diaz, J., Casentini, C., Caudill, S., Cavaglià, M., Cavalier, F., Cavalieri, R., Cella, G., Cepeda, C.B., Cerdá-Durán, P., Cerretani, G., Cesarini, E., Chaibi, O., Chamberlin, S.J., Chan, M., Chao, S., Charlton, P., Chase, E., Chassande-Mottin, E., Chatterjee, D., Cheeseboro, B.D., Chen, H.Y., Chen, X., Chen, Y., Cheng, H-P., Chia, H.Y., Chincarini, A., Chiummo, A., Chmiel, T., Cho, H.S., Cho, M., Chow, J.H., Christensen, N., Chu, Q., Chua, A.J.K., Chua, S., Chung, K.W., Chung, S., Ciani, G., Ciobanu, A.A., Ciolfi, R., Cipriano, F., Cirelli, C.E., Cirone, A., Clara, F., Clark, J.A., Clearwater, P., Cleva, F., Cocchieri, C., Coccia, E., Cohadon, P-F., Cohen, D., Colla, A., Collette, C.G., Collins, C., Cominsky, L.R., Constancio, M., Conti, L., Cooper, S.J., Corban, P., Corbitt, T.R., Cordero-Carrión, I., Corley, K.R., Cornish, N., Corsi, A., Cortese, S., Costa, C.A., Cotesta, R., Coughlin, M.W., Coughlin, S.B., Coulon, J-P., Countryman, S.T., Couvares, P., Covas, P.B., Cowan, E.E., Coward, D.M., Cowart, M.J., Coyne, D.C., Coyne, R., Creighton, J.D.E., Creighton, T.D., Cripe, J., Crowder, S.G., Cullen, T.J., Cumming, A., Cunningham, L., Cuoco, E., Dal Canton, T., Dálya, G., Danilishin, S.L., D'Antonio, S., Danzmann, K., Dasgupta, A., Da.Silva.Costa, C.F., Dattilo, V., Dave, I., Davier, M., Davis, D., Daw, E.J., Day, B., DeBra, D., Deenadayalan, M., Degallaix, J., De Laurentis, M., Deléglise, S., Del Pozzo, W., Demos, N., Denker, T., Dent, T., De Pietri, R., Derby, J., Dergachev, V., De Rosa, R., De Rossi, C., DeSalvo, R., Deutsch, A.S., de Varona, O., Dhurandhar, S., Díaz, M.C., Di Fiore, L., Di Giovanni, M., Di Girolamo, T., Di Lieto, A., Ding, B., Di Pace, S., Di Palma, I., Di Renzo, F., Dmitriev, A., Doctor, Z., Dolique, V., Donovan, F., Dooley, K.L., Doravari, S., Dorrington, I., Dovale Álvarez, M., Downes, T.P., Drago, M., Dreissigacker, C., Driggers, J.C., Du, Z., Dupej, P., Dwyer, S.E., Easter, P.J., Edo, T.B., Edwards, M.C., Effler, A., Eggenstein, H-B., Ehrens, P., Eichholz, J., Eikenberry, S.S., Eisenmann, M., Eisenstein, R.A., Essick, R.C., Estelles, H., Estevez, D., Etienne, Z.B., Etzel, T., Evans, M., Evans, T.M., Fafone, V., Fair, H., Fairhurst, S., Fan, X., Farinon, S., Farr, B., Farr, W.M., Fauchon-Jones, E.J., Favata, M., Fays, M., Fee, C., Fehrmann, H., Feicht, J., Fejer, M.M., Feng, F., Fernandez-Galiana, A., Ferrante, I., Ferreira, E.C., Ferrini, F., Fidecaro, F., Fiori, I., Fiorucci, D., Fishbach, M., Fisher, R.P., Fishner, J.M., Fitz-Axen, M., Flaminio, R., Fletcher, M., Fong, H., Font, J.A., Forsyth, P.W.F., Forsyth, S.S., Fournier, J-D., Frasca, S., Frasconi, F., Frei, Z., Freise, A., Frey, R., Frey, V., Fritschel, P., Frolov, V.V., Fulda, P., Fyffe, M., Gabbard, H.A., Gadre, B.U., Gaebel, S.M., Gair, J.R., Gammaitoni, L., Ganija, M.R., Gaonkar, S.G., Garcia, A., García-Quirós, C., Garufi, F., Gateley, B., Gaudio, S., Gaur, G., Gayathri, V., Gemme, G., Genin, E., Gennai, A., George, D., George, J., Gergely, L., Germain, V., Ghonge, S., Ghosh, Abhirup., Ghosh, Archisman., Ghosh, S., Giacomazzo, B., Giaime, J.A., Giardina, K.D., Giazotto, A., Gill, K., Giordano, G., Glover, L., Goetz, E., Goetz, R., Goncharov, B., González, G., Gonzalez Castro, J.M., Gopakumar, A., Gorodetsky, M.L., Gossan, S.E., Gosselin, M., Gouaty, R., Grado, A., Graef, C., Granata, M., Grant, A., Gras, S., Gray, C., Greco, G., Green, A.C., Green, R., Gretarsson, E.M., Groot, P., Grote, H., Grunewald, S., Gruning, P., Guidi, G.M., Gulati, H.K., Guo, X., Gupta, A., Gupta, M.K., Gushwa, K.E., Gustafson, E.K., Gustafson, R., Halim, O., Hall, B.R., Hall, E.D., Hamilton, E.Z., Hamilton, H.F., Hammond, G., Haney, M., Hanke, M.M., Hanks, J., Hanna, C., Hannuksela, O.A., Hanson, J., Hardwick, T., Harms, J., Harry, G.M., Harry, I.W., Hart, M.J., Haster, C-J., Haughian, K., Healy, J., Heidmann, A., Heintze, M.C., Heitmann, H., Hello, P., Hemming, G., Hendry, M., Heng, I.S., Hennig, J., Heptonstall, A.W., Hernandez, F.J., Heurs, Michèle, Hild, S., Hinderer, T., Hoak, D., Hochheim, S., Hofman, D., Holland, N.A., Holt, K., Holz, D.E., Hopkins, P., Horst, C., Hough, J., Houston, E.A., Howell, E.J., Hreibi, A., Huerta, E.A., Huet, D., Hughey, B., Hulko, M., Husa, S., Huttner, S.H., Huynh-Dinh, T., Iess, A., Indik, N., Ingram, C., Inta, R., Intini, G., Isa, H.N., Isac, J-M., Isi, M., Iyer, B.R., Izumi, K., Jacqmin, T., Jani, K., Jaranowski, P., Johnson, D.S., Johnson, W.W., Jones, D.I., Jones, R., Jonker, R.J.G., Ju, L., Junker, J., Kalaghatgi, C.V., Kalogera, V., Kamai, B., Kandhasamy, S., Kang, G., Kanner, J.B., Kapadia, S.J., Karki, S., Karvinen, K.S., Kasprzack, M., Katolik, M., Katsanevas, S., Katsavounidis, E., Katzman, W., Kaufer, S., Kawabe, K., Keerthana, N.V., Kéfélian, F., Keitel, D., Kemball, A.J., Kennedy, R., Key, J.S., Khalili, F.Y., Khamesra, B., Khan, H., Khan, I., Khan, S., Khan, Z., Khazanov, E.A., Kijbunchoo, N., Kim, Chunglee., Kim, J.C., Kim, K., Kim, W., Kim, W.S., Kim, Y-M., King, E.J., King, P.J., Kinley-Hanlon, M., Kirchhoff, R., Kissel, J.S., Kleybolte, L., Klimenko, S., Knowles, T.D., Koch, P., Koehlenbeck, S.M., Koley, S., Kondrashov, V., Kontos, A., Korobko, M., Korth, W.Z., Kowalska, I., Kozak, D.B., Krämer, C., Kringel, V., Królak, A., Kuehn, G., Kumar, P., Kumar, R., Kumar, S., Kuo, L., Kutynia, A., Kwang, S., Lackey, B.D., Lai, K.H., Landry, M., Lang, R.N., Lange, J., Lantz, B., Lanza, R.K., Lartaux-Vollard, A., Lasky, P.D., Laxen, M., Lazzarini, A., Lazzaro, C., Leaci, P., Leavey, S., Lee, C.H., Lee, H.K., Lee, H.M., Lee, H.W., Lee, K., Lehmann, J., Lenon, A., Leonardi, M., Leroy, N., Letendre, N., Levin, Y., Li, J., Li, T.G.F., Li, X., Linker, S.D., Littenberg, T.B., Liu, J., Liu, X., Lo, R.K.L., Lockerbie, N.A., London, L.T., Longo, A., Lorenzini, M., Loriette, V., Lormand, M., Losurdo, G., Lough, J.D., Lovelace, G., Lück, H., Lumaca, D., Lundgren, A.P., Lynch, R., Ma, Y., Macas, R., Macfoy, S., Machenschalk, B., MacInnis, M., Macleod, D.M., Magaña Hernandez, I., Magaña-Sandoval, F., Magaña Zertuche, L., Magee, R.M., Majorana, E., Maksimovic, I., Man, N., Mandic, V., Mangano, V., Mansell, G.L., Manske, M., Mantovani, M., Marchesoni, F., Marion, F., Márka, S., Márka, Z., Markakis, C., Markosyan, A.S., Markowitz, A., Maros, E., Marquina, A., Martelli, F., Martellini, L., Martin, I.W., Martin, R.M., Martynov, D.V., Mason, K., Massera, E., Masserot, A., Massinger, T.J., Masso-Reid, M., Mastrogiovanni, S., Matas, A., Matichard, F., Matone, L., Mavalvala, N., Mazumder, N., McCann, J.J., McCarthy, R., McClelland, D.E., McCormick, S., McCuller, L., McGuire, S.C., McIver, J., McManus, D.J., McRae, T., McWilliams, S.T., Meacher, D., Meadors, G.D., Mehmet, M., Meidam, J., Mejuto-Villa, E., Melatos, A., Mendell, G., Mendoza-Gandara, D., Mercer, R.A., Mereni, L., Merilh, E.L., Merzougui, M., Meshkov, S., Messenger, C., Messick, C., Metzdorff, R., Meyers, P.M., Miao, H., Michel, C., Middleton, H., Mikhailov, E.E., Milano, L., Miller, A.L., Miller, A., Miller, B.B., Miller, J., Millhouse, M., Mills, J., Milovich-Goff, M.C., Minazzoli, O., Minenkov, Y., Ming, J., Mishra, C., Mitra, S., Mitrofanov, V.P., Mitselmakher, G., Mittleman, R., Moffa, D., Mogushi, K., Mohan, M., Mohapatra, S.R.P., Montani, M., Moore, C.J., Moraru, D., Moreno, G., Morisaki, S., Mours, B., Mow-Lowry, C.M., Mueller, G., Muir, A.W., Mukherjee, Arunava., Mukherjee, D., Mukherjee, S., Mukund, N., Mullavey, A., Munch, J., Muñiz, E.A., Muratore, M., Murray, P.G., Nagar, A., Napier, K., Nardecchia, I., Naticchioni, L., Nayak, R.K., Neilson, J., Nelemans, G., Nelson, T.J.N., Nery, M., Neunzert, A., Nevin, L., Newport, J.M., Ng, K.Y., Ng, S., Nguyen, P., Nguyen, T.T., Nichols, D., Nielsen, A.B., Nissanke, S., Nitz, A., Nocera, F., Nolting, D., North, C., Nuttall, L.K., Obergaulinger, M., Oberling, J., O'Brien, B.D., O'Dea, G.D., Ogin, G.H., Oh, J.J., Oh, S.H., Ohme, F., Ohta, H., Okada, M.A., Oliver, M., Oppermann, P., Oram, Richard.J., O'Reilly, B., Ormiston, R., Ortega, L.F., O'Shaughnessy, R., Ossokine, S., Ottaway, D.J., Overmier, H., Owen, B.J., Pace, A.E., Pagano, G., Page, J., Page, M.A., Pai, A., Pai, S.A., Palamos, J.R., Palashov, O., Palomba, C., Pal-Singh, A., Pan, Howard., Pan, Huang-Wei., Pang, B., Pang, P.T.H., Pankow, C., Pannarale, F., Pant, B.C., Paoletti, F., Paoli, A., Papa, M.A., Parida, A., Parker, W., Pascucci, D., Pasqualetti, A., Passaquieti, R., Passuello, D., Patil, M., Patricelli, B., Pearlstone, B.L., Pedersen, C., Pedraza, M., Pedurand, R., Pekowsky, L., Pele, A., Penn, S., Perez, C.J., Perreca, A., Perri, L.M., Pfeiffer, H.P., Phelps, M., Phukon, K.S., Piccinni, O.J., Pichot, M., Piergiovanni, F., Pierro, V., Pillant, G., Pinard, L., Pinto, I.M., Pirello, M., Pitkin, M., Poggiani, R., Popolizio, P., Porter, E.K., Possenti, L., Post, A., Powell, J., Prasad, J., Pratt, J.W.W., Pratten, G., Predoi, V., Prestegard, T., Principe, M., Privitera, S., Prodi, G.A., Prokhorov, L.G., Puncken, O., Punturo, M., Puppo, P., Pürrer, M., Qi, H., Quetschke, V., Quintero, E.A., Quitzow-James, R., Raab, F.J., Rabeling, D.S., Radkins, H., Raffai, P., Raja, S., Rajan, C., Rajbhandari, B., Rakhmanov, M., Ramirez, K.E., Ramos-Buades, A., Rana, Javed., Rapagnani, P., Raymond, V., Razzano, M., Read, J., Regimbau, T., Rei, L., Reid, S., Reitze, D.H., Ren, W., Ricci, F., Ricker, P.M., Riles, K., Rizzo, M., Robertson, N.A., Robie, R., Robinet, F., Robson, T., Rocchi, A., Rolland, L., Rollins, J.G., Roma, V.J., Romano, R., Romel, C.L., Romie, J.H., Rosińska, D., Ross, M.P., Rowan, S., Rüdiger, A., Ruggi, P., Rutins, G., Ryan, K., Sachdev, S., Sadecki, T., Sakellariadou, M., Salconi, L., Saleem, M., Salemi, F., Samajdar, A., Sammut, L., Sampson, L.M., Sanchez, E.J., 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Smith, R.J.E., Somala, S., Son, E.J., Sorazu, B., Sorrentino, F., Souradeep, T., Spencer, A.P., Srivastava, A.K., Staats, K., Steinke, M., Steinlechner, J., Steinlechner, S., Steinmeyer, D., Steltner, B., Stevenson, S.P., Stocks, D., Stone, R., Stops, D.J., Strain, K.A., Stratta, G., Strigin, S.E., Strunk, A., Sturani, R., Stuver, A.L., Summerscales, T.Z., Sun, L., Sunil, S., Suresh, J., Sutton, P.J., Swinkels, B.L., Szczepańczyk, M.J., Tacca, M., Tait, S.C., Talbot, C., Talukder, D., Tanner, D.B., Tápai, M., Taracchini, A., Tasson, J.D., Taylor, J.A., Taylor, R., Tewari, S.V., Theeg, T., Thies, F., Thomas, E.G., Thomas, M., Thomas, P., Thorne, K.A., Thrane, E., Tiwari, S., Tiwari, V., Tokmakov, K.V., Toland, K., Tonelli, M., Tornasi, Z., Torres-Forné, A., Torrie, C.I., Töyrä, D., Travasso, F., Traylor, G., Trinastic, J., Tringali, M.C., Trozzo, L., Tsang, K.W., Tse, M., Tso, R., Tsuna, D., Tsukada, L., Tuyenbayev, D., Ueno, K., Ugolini, D., Urban, A.L., Usman, S.A., Vahlbruch, H., Vajente, G., Valdes, G., van Bakel, N., van Beuzekom, M., van den Brand, J.F.J., Van.Den.Broeck, C., Vander-Hyde, D.C., van der Schaaf, L., van Heijningen, J.V., van Veggel, A.A., Vardaro, M., Varma, V., Vass, S., Vasúth, M., Vecchio, A., Vedovato, G., Veitch, J., Veitch, P.J., Venkateswara, K., Venugopalan, G., Verkindt, D., Vetrano, F., Viceré, A., Viets, A.D., Vinciguerra, S., Vine, D.J., Vinet, J-Y., Vitale, S., Vo, T., Vocca, H., Vorvick, C., Vyatchanin, S.P., Wade, A.R., Wade, L.E., Wade, M., Walet, R., Walker, M., Wallace, L., Walsh, S., Wang, G., Wang, H., Wang, J.Z., Wang, W.H., Wang, Y.F., Ward, R.L., Warner, J., Was, M., Watchi, J., Weaver, B., Wei, L-W., Weinert, M., Weinstein, A.J., Weiss, R., Wellmann, F., Wen, L., Wessel, E.K., Weßels, P., Westerweck, J., Wette, K., Whelan, J.T., Whiting, B.F., Whittle, C., Wilken, D., Williams, D., Williams, R.D., Williamson, A.R., Willis, J.L., Willke, B., Wimmer, M.H., Winkler, W., Wipf, C.C., Wittel, H., Woan, G., Woehler, J., Wofford, J.K., Wong, W.K., Worden, J., Wright, J.L., Wu, D.S., Wysocki, D.M., Xiao, S., Yam, W., Yamamoto, H., Yancey, C.C., Yang, L., Yap, M.J., Yazback, M., Yu, Hang., Yu, Haocun., Yvert, M., Zadrożny, A., Zanolin, M., Zelenova, T., Zendri, J-P., Zevin, M., Zhang, J., Zhang, L., Zhang, M., Zhang, T., Zhang, Y-H., Zhao, C., Zhou, M., Zhou, Z., Zhu, S.J., Zhu, X.J., Zucker, M.E., Zweizig, J., and Shandera, S.
- Abstract
We present the first Advanced LIGO and Advanced Virgo search for ultracompact binary systems with component masses between 0.2 M-1.0 M using data taken between September 12, 2015 and January 19, 2016. We find no viable gravitational wave candidates. Our null result constrains the coalescence rate of monochromatic (delta function) distributions of nonspinning (0.2 M, 0.2 M) ultracompact binaries to be less than 1.0×106 Gpc-3 yr-1 and the coalescence rate of a similar distribution of (1.0 M, 1.0 M) ultracompact binaries to be less than 1.9×104 Gpc-3 yr-1 (at 90% confidence). Neither black holes nor neutron stars are expected to form below ∼1 M through conventional stellar evolution, though it has been proposed that similarly low mass black holes could be formed primordially through density fluctuations in the early Universe and contribute to the dark matter density. The interpretation of our constraints in the primordial black hole dark matter paradigm is highly model dependent; however, under a particular primordial black hole binary formation scenario we constrain monochromatic primordial black hole populations of 0.2 M to be less than 33% of the total dark matter density and monochromatic populations of 1.0 M to be less than 5% of the dark matter density. The latter strengthens the presently placed bounds from microlensing surveys of massive compact halo objects (MACHOs) provided by the MACHO and EROS Collaborations. © 2018 American Physical Society.
- Published
- 2018
15. Spectral Binaries Hold the Key to the True Ultracool Binary Fraction
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Bardalez Gagliuffi, Daniella Carolina, Burgasser, Adam J1, Bardalez Gagliuffi, Daniella Carolina, Bardalez Gagliuffi, Daniella Carolina, Burgasser, Adam J1, and Bardalez Gagliuffi, Daniella Carolina
- Abstract
Brown dwarfs bridge the gap between stars and giant planets. Lacking sufficient mass to sustain hydrogen fusion, these objects cool and dim as they age, evolving through a temperature-based sequence of spectral types M, L, T and Y. However, the essential mechanisms governing their formation are not well constrained. Binary statistics are a direct outcome of the formation process, and thus provide a means to test formation theories. Observational constraints on the brown dwarf binary fraction place it at 10-20%, dominated by imaging studies (85% of systems) with the most common separation at 4 AU. This coincides with the resolution limit of state-of-the-art imaging techniques, suggesting that the binary fraction is underestimated. I have developed a separation-independent method to identify and characterize tightly-separated (<5 AU) binary systems of brown dwarfs, so-called spectral binaries. To identify these systems I look for traces of methane, the hallmark of the cooler T dwarf class, in the spectra of late-M and early-L dwarfs. Imaging follow-up of 17 spectral binaries yielded 3 (18%) resolved systems, corroborating the observed binary fraction, but 5 (29%) known binaries were missed, reinforcing the hypothesis that the short-separation systems are undercounted. In order to find the true binary fraction of brown dwarfs, I compiled a volume-limited, unbiased, spectroscopic sample of M7-L5 dwarfs and searched for T dwarf companions. In the 25~pc volume, I found 4 candidates, three of which are already confirmed, leading to a spectral binary fraction of 0.95±0.50%, albeit for a specific combination of spectral types. To extract the true binary fraction and determine the biases of the spectral binary method, I have produced a binary population simulation based on different assumptions of the mass function, age distribution, evolutionary models and mass ratio distribution. The baseline model combination we chose is the Chabrier et al. (2005) IMF, a uniform age dis
- Published
- 2017
16. PERIOD CHANGES IN THE GROUP OF ALGOL-TYPE BINARY SYSTEMS WITH ASYNCHRONOUS ROTATION OF THE MAIN COMPONENT
- Author
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Glazunova, L. V.; Astronomical Observatory, Odessa State University, T.G.Shevchenko Park, Odessa 65014 Ukraine and Glazunova, L. V.; Astronomical Observatory, Odessa State University, T.G.Shevchenko Park, Odessa 65014 Ukraine
- Abstract
The period change for the group Algol-type binaries with an asynchronous rotation of a main component is studied. Under the observational data, available in the literature, a general tendency in change of periods of these systems was obtained. As against to the majority of Algols, for 6 of 8 systems of this group the period decrease is observed for last decades.
- Published
- 2017
17. Spectral Binaries Hold the Key to the True Ultracool Binary Fraction
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Bardalez Gagliuffi, Daniella Carolina, Burgasser, Adam J1, Bardalez Gagliuffi, Daniella Carolina, Bardalez Gagliuffi, Daniella Carolina, Burgasser, Adam J1, and Bardalez Gagliuffi, Daniella Carolina
- Abstract
Brown dwarfs bridge the gap between stars and giant planets. Lacking sufficient mass to sustain hydrogen fusion, these objects cool and dim as they age, evolving through a temperature-based sequence of spectral types M, L, T and Y. However, the essential mechanisms governing their formation are not well constrained. Binary statistics are a direct outcome of the formation process, and thus provide a means to test formation theories. Observational constraints on the brown dwarf binary fraction place it at 10-20%, dominated by imaging studies (85% of systems) with the most common separation at 4 AU. This coincides with the resolution limit of state-of-the-art imaging techniques, suggesting that the binary fraction is underestimated. I have developed a separation-independent method to identify and characterize tightly-separated (<5 AU) binary systems of brown dwarfs, so-called spectral binaries. To identify these systems I look for traces of methane, the hallmark of the cooler T dwarf class, in the spectra of late-M and early-L dwarfs. Imaging follow-up of 17 spectral binaries yielded 3 (18%) resolved systems, corroborating the observed binary fraction, but 5 (29%) known binaries were missed, reinforcing the hypothesis that the short-separation systems are undercounted. In order to find the true binary fraction of brown dwarfs, I compiled a volume-limited, unbiased, spectroscopic sample of M7-L5 dwarfs and searched for T dwarf companions. In the 25~pc volume, I found 4 candidates, three of which are already confirmed, leading to a spectral binary fraction of 0.95±0.50%, albeit for a specific combination of spectral types. To extract the true binary fraction and determine the biases of the spectral binary method, I have produced a binary population simulation based on different assumptions of the mass function, age distribution, evolutionary models and mass ratio distribution. The baseline model combination we chose is the Chabrier et al. (2005) IMF, a uniform age dis
- Published
- 2017
18. Propeller effect in two brightest transient X-ray pulsars : 4U 0115+63 and v 0332+53
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Tsygankov, S. S., Lutovinov, A. A., Doroshenko, V., Mushtukov, A. A., Suleimanov, V., Poutanen, Juri, Tsygankov, S. S., Lutovinov, A. A., Doroshenko, V., Mushtukov, A. A., Suleimanov, V., and Poutanen, Juri
- Abstract
Aims. We present the results of the monitoring programmes performed with the Swift/XRT telescope and aimed specifically to detect an abrupt decrease of the observed flux associated with a transition to the propeller regime in two well-known X-ray pulsars 4U 0115+63 and V 0332+53. Methods. Both sources form binary systems with Be optical companions and undergo so-called giant outbursts every 3-4 years. The current observational campaigns were performed with the Swift/XRT telescope in the soft X-ray band (0.5-10 keV) during the declining phases of the outbursts exhibited by both sources in 2015. Results. The transitions to the propeller regime were detected at the threshold luminosities of (1.4 ± 0.4) × 1036 erg s-1 and (2.0 ± 0.4) × 1036 erg s-1 for 4U 0115+63 and V 0332+53, respectively. Spectra of the sources are shown to be significantly softer during the low state. In both sources, the accretion at rates close to the aforementioned threshold values briefly resumes during the periastron passage following the transition into the propeller regime. The strength of the dipole component of the magnetic field required to inhibit the accretion agrees well with estimates based on the position of the cyclotron lines in their spectra, thus excluding presence of a strong multipole component of the magnetic field in the vicinity of the neutron star., QC 20161213
- Published
- 2016
- Full Text
- View/download PDF
19. Dynamic behavior of polydisperse dust system in cryogenic gas discharge complex plasmas
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Antipov, S.N., Schepers, L.P.T., Vasiliev, M.M., Petrov, O.F., Antipov, S.N., Schepers, L.P.T., Vasiliev, M.M., and Petrov, O.F.
- Abstract
Complex (dusty) plasmas of micron-sized CeO2 polydisperse particles in dc glow discharges at 77 and ∼ 10 K were experimentally investigated. It was obtained that dust structure in cryogenic gas discharge plasma can be a mixture of two fractions (components) with completely different dust ordering and dynamics. We observed under some specific conditions that fast-moving particles of one component diffuse through another component consisted of dust particles arranged in linear chains (strings). From experimental data analysis particle velocity distribution functions for each dust component were obtained. The possible nature of two-component dust structure formation was discussed.
- Published
- 2016
20. Dynamic behavior of polydisperse dust system in cryogenic gas discharge complex plasmas
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Antipov, S.N., Schepers, L.P.T., Vasiliev, M.M., Petrov, O.F., Antipov, S.N., Schepers, L.P.T., Vasiliev, M.M., and Petrov, O.F.
- Abstract
Complex (dusty) plasmas of micron-sized CeO2 polydisperse particles in dc glow discharges at 77 and ∼ 10 K were experimentally investigated. It was obtained that dust structure in cryogenic gas discharge plasma can be a mixture of two fractions (components) with completely different dust ordering and dynamics. We observed under some specific conditions that fast-moving particles of one component diffuse through another component consisted of dust particles arranged in linear chains (strings). From experimental data analysis particle velocity distribution functions for each dust component were obtained. The possible nature of two-component dust structure formation was discussed.
- Published
- 2016
21. HST Fine Guidance Sensors Survey for Binaries Among the Massive Stars
- Author
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NAVAL OBSERVATORY WASHINGTON DC ASTROMETRY DEPT, Gies, D R, Aldoretta, E J, Caballero-Nieves, S M, Nelan, E P, Henry, T J, Jao, W, Hartkopf, W I, Mason, B D, Apellaniz, J M, Moffat, A F, NAVAL OBSERVATORY WASHINGTON DC ASTROMETRY DEPT, Gies, D R, Aldoretta, E J, Caballero-Nieves, S M, Nelan, E P, Henry, T J, Jao, W, Hartkopf, W I, Mason, B D, Apellaniz, J M, and Moffat, A F
- Abstract
We present the results of an all sky survey for binary systems among the massive stars that we made with the HST Fine Guidance Sensors. The sample of 225 stars is comprised mainly of Galactic O- and B-type stars and Luminous Blue Variables, plus a few luminous stars in the LMC. The FGS TRANS mode observations are sensitive to detection of companions with an angular separation of 0.01 1 arcsec and brighter than m = 5 mag. The FGS observations resolved 52 binary and 6 triple star systems and detected partially resolved binaries in 7 additional targets, yielding a companion detection frequency of 29%. We also gathered literature results on the numbers of close spectroscopic binaries and wider astrometric binaries among the sample. These results confirm the high multiplicity fraction. The period distribution is essentially flat in increments of log P, although there remains an observational gap in detections for periods of years and decades., Published in EAS Publications Series, v64 p395-396, 2013.
- Published
- 2013
22. Selection criterion of stable dendritic growth at arbitrary Péclet numbers with convection
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Alexandrov, D. V., Galenko, P. K., Alexandrov, D. V., and Galenko, P. K.
- Abstract
A free dendrite growth under forced fluid flow is analyzed for solidification of a nonisothermal binary system. Using an approach to dendrite growth developed by Bouissou and Pelcé, the analysis is presented for the parabolic dendrite interface with small anisotropy of surface energy growing at arbitrary Péclet numbers. The stable growth mode is obtained from the solvability condition giving the stability criterion for the dendrite tip velocity V and dendrite tip radius ρ as a function of the growth Péclet number, flow Péclet number, and Reynolds number. In limiting cases, the obtained stability criterion presents known criteria for small and high growth Péclet numbers of the solidifying system with and without convective fluid flow. © 2013 American Physical Society.
- Published
- 2013
23. Thiophene and naphthalene eutectics with benzene homologs
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Belousova, O. A. and Belousova, O. A.
- Abstract
The variation in composition and melting point of binary eutectics of thiophene and naphthalene with benzene homologs is established. Analysis permits prediction that eutectics will exist in 48 binary systems and 67 ternary systems that have not been experimentally studied. © 2013 Allerton Press, Inc.
- Published
- 2013
24. Thiophene and naphthalene eutectics with benzene homologs
- Author
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Belousova, O. A. and Belousova, O. A.
- Abstract
The variation in composition and melting point of binary eutectics of thiophene and naphthalene with benzene homologs is established. Analysis permits prediction that eutectics will exist in 48 binary systems and 67 ternary systems that have not been experimentally studied. © 2013 Allerton Press, Inc.
- Published
- 2013
25. Double difiusion in Ar-N2 Binary gas system at the constant value of temperature gradient
- Author
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Seleznev, V. D., Kosov, V. N., Poyarkov, I. V., Fedorenko, O. V., Beketaeva, M. T., Seleznev, V. D., Kosov, V. N., Poyarkov, I. V., Fedorenko, O. V., and Beketaeva, M. T.
- Abstract
An experimental study of the diffusion-gravitational convection transition boundary in an Ar-N2 binary system at different pressures and a constant temperature gradient is performed. It is shown that the diflusion is replaced by the gravitational convection at a pressure p 0:5 MPa. In terms of the stability theory, a perturbation boundary line is determined, dividing the Rayleigh numbers plane into the regions of the diflusion and the convective mass transfer. The experimental data agree well with the theoretical values.
- Published
- 2013
26. Gravitational wave background from compact objects and a new search for supermassive black hole binaries
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Rosado González, Pablo Antonio and Rosado González, Pablo Antonio
- Abstract
[no abstract]
- Published
- 2013
27. Adaptive impedance matching network with digital capacitor in narrowband power line communication
- Author
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Fumio Harashima, Rui, C.P., Barsoum, N.N., Ming, A.W.K., Wong, Kiing Ing, Fumio Harashima, Rui, C.P., Barsoum, N.N., Ming, A.W.K., and Wong, Kiing Ing
- Abstract
Power Line Communication is increasingly getting common in various applications. However, the noise level and impedance mismatch are still the main concern of the technology. Although the noise level and the impedance mismatch of the systems can be controlled using a bandpass filter and an impedance matching circuit, respectively, the variables in the power line are not static and it is rather difficult to design a circuit that allows maximum power transfer in the system all the time. In this paper, a new adaptive impedance matching circuit is proposed for narrowband power line communication. A new model using a digital capacitor and a digital resistor are derived that based on the Band Pass RLC impedance matching network.
- Published
- 2013
28. Ab Initio Study of Lattice Site Occupancies in Binary Sigma Phases Using a Single-Site Mean Field Model
- Author
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Kabliman, Evgeniya, Ruban, Andrei V., Blaha, Peter, Peil, Oleg, Schwarz, Karlheinz, Kabliman, Evgeniya, Ruban, Andrei V., Blaha, Peter, Peil, Oleg, and Schwarz, Karlheinz
- Abstract
The site occupation of binary Fe-Cr, Co-Cr, Re-W and Fe-V sigma phases is studied in the present work with a first-principles-based single-site mean field theory. We show that the alloy components in these systems exhibit similar site preferences except for the Re-W system, where the occupation of two sites is reversed in agreement with previously published works. In case of the FeV sigma phase, for which the size mismatch between the alloy components is large, we also include into our consideration the effect of local lattice relaxations. The obtained results are found in good agreement with the experimental data and previous theoretical studies., QC 20151210
- Published
- 2012
- Full Text
- View/download PDF
29. Structural and mechanical properties of some aluminum-based binary alloys
- Author
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Balanović, Ljubiša, Živković, Dragana, Manasijević, Dragan, Marković, Ivana, Talijan, Nadežda M., Ćosović, Vladan, Marjanović, Bata, Balanović, Ljubiša, Živković, Dragana, Manasijević, Dragan, Marković, Ivana, Talijan, Nadežda M., Ćosović, Vladan, and Marjanović, Bata
- Abstract
The purpose of this study is to investigate structural and mechanical properties of some aluminum-based alloys. Microstructures of the Al-Sn and Al-Zn binary alloys were examined using optic microscopy. The mechanical properties - Vickers hardness and micro hardness tests were investigated according to standard procedure.
- Published
- 2012
30. Structural and mechanical properties of some aluminum-based binary alloys
- Author
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Balanović, Ljubiša, Živković, Dragana, Manasijević, Dragan, Marković, Ivana, Talijan, Nadežda M., Ćosović, Vladan, Marjanović, Bata, Balanović, Ljubiša, Živković, Dragana, Manasijević, Dragan, Marković, Ivana, Talijan, Nadežda M., Ćosović, Vladan, and Marjanović, Bata
- Abstract
The purpose of this study is to investigate structural and mechanical properties of some aluminum-based alloys. Microstructures of the Al-Sn and Al-Zn binary alloys were examined using optic microscopy. The mechanical properties - Vickers hardness and micro hardness tests were investigated according to standard procedure.
- Published
- 2012
31. Nanorheology and nanotribology of two-component liquid crystal
- Author
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Mizuno, Hiroyasu, Haraszti, T., Mizukami, M., Kurihara, K., Mizuno, Hiroyasu, Haraszti, T., Mizukami, M., and Kurihara, K.
- Abstract
Rheological and tribological properties of a model lubricant consisting of a two-component liquid crystal, mixtures of Sudan Black B (dye) and 4-cyano-4'-hexylbiphenyl (6CB, liquid crystal), nano-films confined between mica surfaces were studied as functions of the surface separation distance (D) and the normal load (N). The compositions of Sudan Black B/6CB binary system were determined by FECO spectroscopy. The rheological properties which reflects the structuring and packing of binary system were examined employing the resonance shear measurement with varying the separation distance at the nanometer resolution. FECO spectroscopy revealed that apparent extinction coefficient of Sudan Black B/6CB increased monotonically with decreasing D, especially below ca. 6 nm, at all initial dye concentrations studied, 0.06-1.03 wt%. This indicated the increase in the Sudan Black B concentration in the gap between mica surfaces with the decreasing D, due to the interaction of a large planar structure dye, Sudan Black B, with mica surface. The resonance shear measurement revealed the sudden drop of the amplitude during the shear, which was not observed for one component 6CB. This drop corresponded to the stick-slip transition, which reflected the structural change in the confined dye/liquid crystal from the solid-like to liquid-like state. The combination of FECO spectroscopy and resonance shear measurement can give insights into the properties of multi-component mixtures depending on their composition., QC 20140926
- Published
- 2009
- Full Text
- View/download PDF
32. Prediction of excess molar volumes of binary mixtures of organic compounds from refractive indices
- Author
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Radović, Ivona, Kijevčanin, Mirjana, Gabrijel, Marijan Z., Šerbanović, Slobodan P., Đorđević, Bojan D., Radović, Ivona, Kijevčanin, Mirjana, Gabrijel, Marijan Z., Šerbanović, Slobodan P., and Đorđević, Bojan D.
- Abstract
The excess molar volumes of 51 binary mixtures containing diverse groups of organic compounds: alcohols (methanol, ethanol, propan-1-ol, butan-1-ol, pentan-1-ol, hexan-1-ol, and heptan-1-ol), (cyclo-) alkanes (hexane, heptane, octane, nonane, decane, undecane, dodecane, and cyclohexane), esters (diethyl carbonate and ethyl chloroacetate), aromatics (o-xylene, m-xylene, p-xylene, and ethylbenzene), ketones (acetone), and ethers (anisole), were predicted from the refractive index data, using three types of equations coupled with several different mixing rules for refractive index calculations: the Lorentz-Lorenz, Dale-Gladstone, Eykman, Arago-Biot, Newton, and the Oster. These systems were chosen since they belong to different classes of organic species forming molecular interactions and intermolecular forces during mixing resulting in positive or negative, smaller or larger deviations from ideal behaviour. The obtained results were analysed in terms of the applied equation and mixing rule, the nature of compounds of the mixtures and the influence of alkyl chain length of the alkane or alcohol molecule.
- Published
- 2008
33. Prediction of excess molar volumes of binary mixtures of organic compounds from refractive indices
- Author
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Radović, Ivona, Kijevčanin, Mirjana, Gabrijel, Marijan Z., Šerbanović, Slobodan P., Đorđević, Bojan D., Radović, Ivona, Kijevčanin, Mirjana, Gabrijel, Marijan Z., Šerbanović, Slobodan P., and Đorđević, Bojan D.
- Abstract
The excess molar volumes of 51 binary mixtures containing diverse groups of organic compounds: alcohols (methanol, ethanol, propan-1-ol, butan-1-ol, pentan-1-ol, hexan-1-ol, and heptan-1-ol), (cyclo-) alkanes (hexane, heptane, octane, nonane, decane, undecane, dodecane, and cyclohexane), esters (diethyl carbonate and ethyl chloroacetate), aromatics (o-xylene, m-xylene, p-xylene, and ethylbenzene), ketones (acetone), and ethers (anisole), were predicted from the refractive index data, using three types of equations coupled with several different mixing rules for refractive index calculations: the Lorentz-Lorenz, Dale-Gladstone, Eykman, Arago-Biot, Newton, and the Oster. These systems were chosen since they belong to different classes of organic species forming molecular interactions and intermolecular forces during mixing resulting in positive or negative, smaller or larger deviations from ideal behaviour. The obtained results were analysed in terms of the applied equation and mixing rule, the nature of compounds of the mixtures and the influence of alkyl chain length of the alkane or alcohol molecule.
- Published
- 2008
34. Automated calculation of complete Pxy and Txy diagrams for binary systems
- Author
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Cismondi, Martin, Michelsen, Michael Locht, Cismondi, Martin, and Michelsen, Michael Locht
- Abstract
An algorithm for the calculation of global phase equilibrium diagrams has been recently developed [M. Cismondi, M.L. Michelsen, Global phase equilibrium calculations: critical lines, critical end points and liquid-liquid-vapour equilibrium in binary mixtures, J. Supercrit. Fluids 39 (2007) 287-295]. It integrates the calculation of critical lines, liquid-liquid-vapour (LLV) lines and critical end points, and was implemented in the software program GPEC: global phase equilibrium calculations [M. Cismondi, D.N. Nunez, M.S. Zabaloy, E.A. Brignole, M.L. Michelsen, J.M. Mollerup, GPEC: a program for global phase equilibrium calculations in binary systems, in: Proceedings of the CD-ROM EQUIFASE 2006, Morelia, Michoacan, Mexico, October 21-25, 2006; www.gpec.plapiqui.edu.ar]. In this work we present the methods and computational strategy for the automated calculation of complete Pxy and Txy diagrams in binary systems. Being constructed from the points given by the global phase diagram at a specified temperature or pressure, their calculation does not require the implementation of stability analysis. We illustrate the application of the algorithm through a variety of Pxy and Txy diagrams generated using the RK-PR EOS.
- Published
- 2007
35. Automated calculation of complete Pxy and Txy diagrams for binary systems
- Author
-
Cismondi, Martin, Michelsen, Michael Locht, Cismondi, Martin, and Michelsen, Michael Locht
- Abstract
An algorithm for the calculation of global phase equilibrium diagrams has been recently developed [M. Cismondi, M.L. Michelsen, Global phase equilibrium calculations: critical lines, critical end points and liquid-liquid-vapour equilibrium in binary mixtures, J. Supercrit. Fluids 39 (2007) 287-295]. It integrates the calculation of critical lines, liquid-liquid-vapour (LLV) lines and critical end points, and was implemented in the software program GPEC: global phase equilibrium calculations [M. Cismondi, D.N. Nunez, M.S. Zabaloy, E.A. Brignole, M.L. Michelsen, J.M. Mollerup, GPEC: a program for global phase equilibrium calculations in binary systems, in: Proceedings of the CD-ROM EQUIFASE 2006, Morelia, Michoacan, Mexico, October 21-25, 2006; www.gpec.plapiqui.edu.ar]. In this work we present the methods and computational strategy for the automated calculation of complete Pxy and Txy diagrams in binary systems. Being constructed from the points given by the global phase diagram at a specified temperature or pressure, their calculation does not require the implementation of stability analysis. We illustrate the application of the algorithm through a variety of Pxy and Txy diagrams generated using the RK-PR EOS.
- Published
- 2007
36. Parallel Block Lanczos for solving large binary systems
- Author
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Peterson, Michael and Peterson, Michael
- Abstract
The Lanczos algorithm is very useful in solving a large, sparse linear system A x = y and then finding vectors in the kernel of A. Such a system may arise naturally through number factoring algorithms for example. In this thesis, we present a variant of the binary Lanczos algorithm that directly finds vectors in the kernel of A without first solving the system. The number factoring algorithms ultimately require us to find such vectors. Our adaptation combines ideas of Peter Montgomery and Don Coppersmith. We also discuss implementation issues, including parallelization.
- Published
- 2006
37. Binary interaction parameters for critical loci of polar and non-polar systems
- Author
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Lal, Manish Kumar and Lal, Manish Kumar
- Abstract
NOT AVAILABLE
- Published
- 2002
38. A thermodynamic analysis of the Mo-V and Mo-V-C systems
- Author
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Bratberg, Johan, Frisk, Karin, Bratberg, Johan, and Frisk, Karin
- Abstract
A new thermodynamic evaluation of the binary Mo-V system and the ternary Mo-V-C system using thermodynamic models for the Gibbs energy of individual phases is presented. The CALPHAD method has been used, with predictions of unknown thermodynamic quantities, to optimize a set of thermodynamic parameters taking related experimental information into consideration. The predictions are based on regularities in bonding properties and vibrational entropy of 3d-transition metal carbides. The results are summarized in tables of thermodynamic parameters, calculated binary phase diagrams and isothermal sections of the ternary phase diagram compared with experimental information. Finally the influence of ternary interaction parameters, especially in the fcc phase, on calculations of equilibria in multicomponent systems is discussed., QC 20100929
- Published
- 2002
- Full Text
- View/download PDF
39. Equivalence of two parallel approaches to the cluster variation method: the multisite correlation functions method and the cluster effective fields method
- Author
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Matić, Vladimir M., Milošević, Sanja S., Matić, Vladimir M., and Milošević, Sanja S.
- Abstract
We have analyzed relationship between two parallel approaches to the cluster variation method (CVM) as a theoretical tool for studying statistical properties of binary systems. The first approach to the method uses the multisite correlation functions as variational variables, while the other approach is the one that uses the cluster effective fields as variational variables. Using the Ising model description of physical systems studied, we have shown that the two approaches should produce identical final results, although they deal with quite different systems of nonlinear equations (which, in particular cases under study, must be solved numerically for a given temperature and chemical potential). To achieve identical final results, we show that it is necessary to introduce cluster fields for those clusters which appear to be subclusters of at least two different members of the Kikuchi cluster family. In addition, we demonstrate that variational variables of the two approaches generate two sets of cluster probabilities, whose intersection contains solution of the CVM approximation which corresponds to the thermodynamic equilibrium state. We also analyze the existence of the so-called consistency relations in both approaches to the CVM method, and, finally, we discuss the problem of convergency of numerical procedures that are used to analyze the low-temperature states of the model systems under study. (C) 1999 Elsevier Science B.V. All rights reserved.
- Published
- 1999
40. Equivalence of two parallel approaches to the cluster variation method: the multisite correlation functions method and the cluster effective fields method
- Author
-
Matić, Vladimir M., Milošević, Sava, Matić, Vladimir M., and Milošević, Sava
- Abstract
We have analyzed relationship between two parallel approaches to the cluster variation method (CVM) as a theoretical tool for studying statistical properties of binary systems. The first approach to the method uses the multisite correlation functions as variational variables, while the other approach is the one that uses the cluster effective fields as variational variables. Using the Ising model description of physical systems studied, we have shown that the two approaches should produce identical final results, although they deal with quite different systems of nonlinear equations (which, in particular cases under study, must be solved numerically for a given temperature and chemical potential). To achieve identical final results, we show that it is necessary to introduce cluster fields for those clusters which appear to be subclusters of at least two different members of the Kikuchi cluster family. In addition, we demonstrate that variational variables of the two approaches generate two sets of cluster probabilities, whose intersection contains solution of the CVM approximation which corresponds to the thermodynamic equilibrium state. We also analyze the existence of the so-called consistency relations in both approaches to the CVM method, and, finally, we discuss the problem of convergency of numerical procedures that are used to analyze the low-temperature states of the model systems under study. (C) 1999 Elsevier Science B.V. All rights reserved.
- Published
- 1999
41. Modeling Melting in Binary Systems
- Author
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Son, L. D., Rusakov, G. M., Patashinski, A. Z., Ratner, M. A., Son, L. D., Rusakov, G. M., Patashinski, A. Z., and Ratner, M. A.
- Abstract
A coarsened model for a binary system with limited miscibility of components is proposed; the system is described in terms of structural states in small parts of the material. The material is assumed to have two alternative types of crystalline local arrangements associated with two components of the alloy. Fluctuating characteristics of a cluster are the type and the space orientation of its crystalline arrangement. There are two different phase transitions in the model system, an orientation order-disorder transition representing melting, and a phase transition between phases differing in concentration of components. Depending on the parameters characterizing the interaction in the system, this last transition may take place both in the crystalline and in the amorphous (molten) phase. A special approximation is used to study the thermodynamics of the system. The calculated phase diagram describes, at least qualitatively, the most important features of a binary system.
- Published
- 1998
42. Techniques for optical binary multiplication
- Author
-
Chandran, Vinod and Chandran, Vinod
- Abstract
Since the late 1930's optics has gradually developed stronger ties with the communication and information sciences of electrical engineering" {4}. The mathematical techniques of frequency analysis developed for communication Systems were applied to analyze optical imaging Systems and then to synthesize desired System transfer functions. The Fourier Transform relationship which exists between the light amplitude distributions at the front and back focal planes of a lens is frequently utilized for both spatial filtering and optical information processing. Since in an optical System two independent spatial variables are available, such a System can handle 2-D opérations such as convolution, crosscorrelation, autocorrélation etc. without having to resort to scanning. Important advances hâve been achieved by the application of Fourier synthesis techniques—the Zernike phase contrast microscope, optical matched filters, various contrast-enhancement techniques, optical character récognition and optical processing of synthetic aperture radar data.
- Published
- 1985
43. Preserving Average Proximity in Arrays with Duplications.
- Author
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ILLINOIS UNIV AT URBANA-CHAMPAIGN APPLIED COMPUTATION THEORY GROUP, Chow,Anita Liu, ILLINOIS UNIV AT URBANA-CHAMPAIGN APPLIED COMPUTATION THEORY GROUP, and Chow,Anita Liu
- Abstract
Efficiency of storage management in algorithms which use arrays is often enhanced if the arrays are stored in a proximity-preserving manner, that is, array positions which are close to one another in the array are also stored close to one another in the memory structure. It has been shown that any scheme that stores arrays in a linear memory, in both the worst and the average case, induces unbounded loss of proximity, but arrays can be stored in binary trees with bounded loss of average proximity. This paper is devoted to studying the effect of introducing duplication of items of a square array A on the average path length between the images of any two records adjacent to A under mapping from A into the set of leaves of a complete binary tree. It is shown that with the appropriate choice of duplications, in some arrays the average path length can be decreased by as much as 12% without using a deeper tree than needed in the absence of duplication. (Author), Also available as Rept. no. R-812.
- Published
- 1978
44. Lower Bounds on Bearing Accuracy for Closely Spaced Sources.
- Author
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AMERICAN SOCIETY FOR ENGINEERING EDUCATION WASHINGTON DC, Hamilton, Miriam, AMERICAN SOCIETY FOR ENGINEERING EDUCATION WASHINGTON DC, and Hamilton, Miriam
- Abstract
This report presents Cramer-Rao lower bounds on bearing estimation error for two closely spaced incoherent sources which radiate spectrally overlapping broadband Gaussian noise. The radiated signals are assumed to occupy the same frequency band which is taken to be lowpass and rectangular in shape. In the most general problem setting, when prior knowledge of signal levels or a single source bearing is unavailable, estimation accuracy is shown to degrade in proportion to the second power of the inverse angular spacing, resulting in large degradations when compared to the accuracy attainable in a single source setting. There is evidence that in certain situations, a form of apriori knowledge concerning signal power levels can be used to significant advantage in joint bearing estimation. Detectability of a second source from signal field containing two closely spaced sources that overlap in both time and frequency depends on the resolving power of the array and is expected to be poor at low signal-to-noise ratios and short observation times when the angular spacing is small. Results of a binary hypothesis test indicate that below a well defined threshold the probability of error in guessing the wrong hypothesis tends to one half. Reachability of the earlier computed Cramer-Rao lower bounds for this regime is questionable.
- Published
- 1987
45. A METHOD FOR GENERATING EQUIPROBABLE BINARY NUMBERS AND A DEVICE FOR ITS REALIZATION
- Author
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FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH, DANIL'CHENKO, I.A., FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH, and DANIL'CHENKO, I.A.
- Published
- 1963
46. Phase Behavior in Binary and Multicomponent Systems at Elevated Pressures: n-Pentane and Methane-n-Pentane
- Author
-
NATIONAL STANDARD REFERENCE DATA SYSTEM, Berry, Virginia M, Sage, B H, NATIONAL STANDARD REFERENCE DATA SYSTEM, Berry, Virginia M, and Sage, B H
- Abstract
This paper, which is concerned with the critical evaluation of data on the phase behavior of binary systems, consists of three parts. In the first part the rationale of the evaluation process used is discussed, in the second the behavior of n-pentane, and in the third the behavior of the system methane-n-pentane. The properties of n-pentane considered are the critical constants and the vapor pressures and densities of the saturated coexistent phases as functions of temperature. For the methane-n-pentane system the compositions and densities of the coexisting phases are given as functions of temperature and total pressure. Data for the unique states of the two-component system are also presented. Discussions are given of the reliability of the selected values and of the differences between the selected values and various measured values. (Author)
- Published
- 1970
47. A Resonance Tube Apparatus for Absorption Measurements.
- Author
-
WYLE LABS HUNTSVILLE ALA RESEARCH STAFF, Chien,F., WYLE LABS HUNTSVILLE ALA RESEARCH STAFF, and Chien,F.
- Abstract
A theoretical model of atmospheric absorption of sound previously has been proposed which more accurately accounts for molecular relaxation of the various constituents in air. Rate constants for these relaxation processes in binary gas mixtures and the concentration of each component are required in the calculations than room temperature, it is necessary to know these rate constants as a function of temperature. Such information can be extracted from sound absorption measurements with binary gas mixtures at various temperatures. This report presents preliminary information the design of an experimental program directed towards obtaining these rate constants by sound absorption measurements at low frequencies. The study is part of a continuous basic research program on sound absorption in air. (Author)
- Published
- 1973
48. AN INVESTIGATION OF THE NIOBIUM-ZIRCONIUM-HAFNIUM-CARBON SYSTEM
- Author
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FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO, Fedorov,T. F., Gladyshevskii,E. I., Popova,N. M., FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO, Fedorov,T. F., Gladyshevskii,E. I., and Popova,N. M.
- Abstract
The phase relationships in the system Nb-Zr-Hf-C were investigated. Phase diagrams based on x-ray and metallographic data are presented. The phase composition of the ternary systems Zr-Nb-C and of the binary system ZrC-HfC, were determined. The results are tabulated., Edited trans. of mono. Eksperimentalnaya Tekhnika i Metody Vysokotemperaturnykh Izmerenii (Experimental Techniques and Methods of High Temperature Measurement) Moscow, 1966 p127-135.
- Published
- 1968
49. LOCAL ORDER FOR TERNARY MATERIALS IN A CRYSTAL.
- Author
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NAVY ELECTRONICS LAB SAN DIEGO CALIF, CHRISTY, D. O., NAVY ELECTRONICS LAB SAN DIEGO CALIF, and CHRISTY, D. O.
- Abstract
The coding technique for describing order in a binary material (Phys. Rev. v104 p350 1956) is extended to describe a ternary substitutional material. The coding is so constructed that in the limit as the third component becomes small, the ternary-order parameters approach the Warren-Cowley binary-order parameters. Bounding values developed for the various-order parameters result from geometrical considerations. The number of each kind of pairs must be non-negative. The Schwarz inequality technique must be applicable to the coding function. A simple scattering problem using the order parameters is presented. An experimental approach to measuring the order parameters is suggested. (Author)
- Published
- 1966
50. A SINTER PROCESS, USING MERCURY AS AN 'AUXILIARY COMPONENT' AS APPLIED TO RE-MN SYSTEMS. (A SUMMARIZING DISCUSSION). DIFFERENTIAL-THERMAL- AND MAGNETO-THERMALANALYSIS OF THE SYSTEM GD-MN (0 - 50 W.% MN)
- Author
-
TECHNISCHE HOCHSCHULE VIENNA (AUSTRIA), Lihl,F., TECHNISCHE HOCHSCHULE VIENNA (AUSTRIA), and Lihl,F.
- Abstract
A summarizing discussion of the 'amalgam process' is given which turned out to lead to equilibrium states even at higher temperatures than 300 - 400 C. Applying the 'amalgam process' to higher temperatures (800 - 1200 C) the mercury, bound by the respective RE-metals, plays the role of an 'auxiliary component'. The amalgam process is the main step of a very particular sinter process. The distillation of mercury out of the amalgam yields intimately mixtures of very fine and reactive powders of RE- and Mn-metal. The different steps of the sinter process are described in detail as well as the results gained applying this alloying method to the RE (Gd, Sm, Dy, Ho, Er)-Mn systems. By means of newly developed methods for differential thermal analysis (DTA) and magnetothermal analysis of small amounts of high reactive materials, especially the system Gd-Mn was studied and a partial phase diagram (0 - 50 w.% Gd) is given.
- Published
- 1964
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