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811 results on '"Hubbard M"'

1. A Velocity-based Moving Mesh Virtual Element Method

Author

Wells, H., Hubbard, M. E., and Cangiani, A.

Subjects
Mathematics - Numerical Analysis
Abstract

We present a velocity-based moving mesh virtual element method for the numerical solution of PDEs involving moving boundaries. The virtual element method is used for computing both the mesh velocity and a conservative Arbitrary Lagrangian-Eulerian solution transfer on general polygonal meshes. The approach extends the linear finite element method to polygonal mesh structures, achieving the same degree of accuracy. In the context of moving meshes, a major advantage of the virtual element approach is the ease with which nodes can be inserted on mesh edges. Demonstrations of node insertion techniques are presented to show that moving polygonal meshes can be simply adapted for situations where a boundary encounters a solid object or another moving boundary, without reduction in degree of accuracy.

Published
2022
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2. First Demonstration of Field-Deployable Low Latency Hollow-core Cable Capable of Supporting >1000km, 400Gb/s WDM Transmission

Author

Saljoghei, A., Qiu, M., Sandoghchi, S. R., Laperle, C., Alonso, M., Hubbard, M., Lang, I., Pasandi, M., Chen, Y., Petrocich, M., Appleyard, A., Boyland, A., Hooper, L., Bradley, T., Jasion, G., Sakr, H., Fokoua, E. Numkam, Hayes, J., Poletti, F., Richardson, D., Fake, M., and O'Sullivan, M.

Subjects
Electrical Engineering and Systems Science - Signal Processing
Abstract

We report order-of-magnitude improvements in performance of field-deployable hollow-core fiber cables evidenced by a 38.4Tb/s (800Gb/s-x-48WDM-channels) 20.5km lab-trial using commercial terminal equipment and the demonstration of 1128km/126km reach in full-fill 400/800Gb/s WDM recirculating-loop experiments., Comment: 4 pages, 2 figures, sbmitted to but not accepted by OFC 2021 Post deadline subcommittee D1

Published
2021

3. In-band Perturbation based OSNR Estimation

Author

Vaquero-Caballero, F. J., Charlton, D., Mousa-Pasandi, M. E., Ives, D. J., Laperle, C., Hubbard, M., Reimer, M., OSullivan, M., and Savory, S. J.

Subjects
Electrical Engineering and Systems Science - Signal Processing
Abstract

Perturbed spectra are modelled to estimate OSNR for a single channel amplified link. Perturbation-dependent nonlinear noise is separated from constant ASE noise using a set of propagated perturbed spectra. A least mean square fitting is used to estimate OSNR with standard deviation of 0.16 dB., Comment: 5 pages

Published
2020

8. Pancam Multispectral Imaging Results from the Opportunity Rover at Meridiani Planum

Author

Bell, J. F., Squyres, S. W., Arvidson, R. E., Arneson, H. M., Bass, D., Calvin, W., Farrand, W. H., Goetz, W., Golombek, M., Greeley, R., Grotzinger, J., Guinness, E., Hayes, A. G., Hubbard, M. Y. H., Herkenhoff, K. E., Johnson, M. J., Johnson, J. R., Joseph, J., Kinch, K. M., Lemmon, M. T., Li, R., Madsen, M. B., Maki, J. N., Malin, M., McCartney, E., McLennan, S., McSween, H. Y., Ming, D. W., Morris, R. V., Parker, T. J., Proton, J., Rice, J. W., Seelos, F., Soderblom, J. M., Soderblom, L. A., Sohl-Dickstein, J. N., Sullivan, R. J., Weitz, C. M., and Wolff, M. J.

Published
2004

9. Pancam Multispectral Imaging Results from the Spirit Rover at Gusev Crater

Author

Bell, J. F., Squyres, S. W., Arvidson, R. E., Arneson, H. M., Bass, D., Blaney, D., Cabrol, N., Calvin, W., Farmer, J., Farrand, W. H., Goetz, W., Golombek, M., Grant, J. A., Greeley, R., Guinness, E., Hayes, A. G., Hubbard, M. Y. H., Herkenhoff, K. E., Johnson, M. J., Johnson, J. R., Joseph, J., Kinch, K. M., Lemmon, M. T., Li, R., Madsen, M. B., Maki, J. N., Malin, M., McCartney, E., McLennan, S., McSween, H. Y., Ming, D. W., Moersch, J. E., Morris, R. V., Parker, T. J., Proton, J., Rice, J. W., Seelos, F., Soderblom, J., Soderblom, L. A., Sohl-Dickstein, J. N., Sullivan, R. J., Wolff, M. J., and Wang, A.

Published
2004

13. Low-Temperature Phase Transition in Bi_2Sr_2Ca(Ni_xCu_{1-x})_20_8: Evidence for Unconventional Superconductivity

Author

Movshovich, R., Hubbard, M. A., Salamon, M. B., Balatsky, A. V., Yoshizaki, R., and Sarrao, J. L.

Subjects
Condensed Matter - Superconductivity
Abstract

We report the discovery of a low-temperature phase transition in Bi_2Sr_2Ca(Ni_xCu_{1-x})_20_8 high temperature superconductor. This transition manifests itself as a sharp reduction of the thermal conductivity of the samples at a temperature of T_c* \approx 200 mK. The temperature dependence of the thermal conductivity changes dramatically from T^\alpha with \alpha between 1.6 and 1.75 above the transition to T-linear behavior below the transition. Application of a small magnetic field suppresses the low-temperature phase. We interpret this behavior as a phase transition into a second bulk low-temperature superconducting state in which the time-reversal symmetry is likely to be broken. This discovery constitutes direct evidence for unconventional superconductivity in high temperature superconductors., Comment: uuencoded latex file with 2 ps figure files

Published
1997

16. Performance Comparison Between All-Pass and IQ Optical Modulation

Author

Saxena, B., Farley, K., Reimer, M. A., Hubbard, M., O'Sullivan, M., and Khandani, A. K.

Abstract

We report a reduced complexity single polarization all-pass modulation scheme that uses overlap and discard to implement continuous transmission. We find that transmitter NSRs of −25 dB and −21 dB can be achieved with 1/3 and 1/6 the complexity, respectively, of reported solutions. We compare this modulation scheme with a conventional Mach-Zehnder modulator solution by measures of throughput, spectral efficiency, DSP and hardware complexity as well as back-to-back modem margin.

Published
2024
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17. School leavers with multiple disabilities : an exploratory study of the issues and problems relating to the planning and provision of formal post-school services

Author

Hubbard, M. M.

Subjects
301, Vocational guidance--Great Britain, Youth employment--Great Britain, Young adults with disabilities--Great Britain
Abstract

This research is an exploratory study of the issues and problems encountered by Young People with multiple disabilities when they leave school and for whom formal post-school service provision is relevant within the Scottish setting. The research problem is tackled by a qualitative and an empirically grounded study with a central focus was on the way in which decisions about the nature and range of services are made and their potential for making a major impact on quality of life. From conception, the study was innovatory and it was necessary to combine methods of data collection and to analyse in ways that had previously not been used in the field. The design and methods are eclectic with an emphasis on in-depth case-studies. The research process began with the development of a functional classification used to define the sub-population. This was followed by an investigation of the structure and organisation of the Future Needs Assessment process which is central to the planning of formal post-school provision. together with Carer perspectives and opinions of the process. The next phase was to examine the nature and range of formal post-school service provision in relation to the issue of quality of life and in the meeting of developmental needs. Discussion then took place with the Young People and the Carers about their judgements of post-school provision and 'ideal' provision. The final phase developed recommendations on the practical application of, the research findings. The major research findings, derived from the fieldwork evidence. indicate that there is a radical change in emphasis in the transition from school to adult-based formal service provision which result in the limitation of services and of personal choice. There is a major disjunction in the quality of life experienced by the Young People. The Future Needs Assessment process fails to adequately plan for the transition to formal post-school provision which fails to meet individual personal and social development. The major recommendations, derived from the research, state that the Future Needs Assessment process must play a more effective role in identifying the post-school needs of the School-leavers to ensure that formal post-school provision and delivery planning is individually-centred and 'needs-led'. In addition, there should be greater choice of provision which follows the 'independent /enabling /empowering model and which will offer the School leaver the potential to experience a high quality of life.

Published
1992

27. Mayflies (Insecta: Ephemeroptera) from Venezuela

Author

Pescador, M. L., Chacón, M. M., Hubbard, M. D., and Segnini, S.

Subjects
Biology (General), QH301-705.5
Abstract

A list of the known mayfly (Ephemeroptera) fauna of Venezuela is given, along with the states and bioregions fromwhich each species is known. Depositions of the type specimens of each species are also listed.

Published
2009

29. Application-Oriented, Discussion of Results

Author

Elsholz, E., Leschziner, M. A., Kourta, A., Brandsma, F. J., Haase, W., Smith, P. D., Schwamborn, D., Benton, J. J., Fraisse, M. C., Hubbard, M. E., King, D. A., Sørensen, J. N., Hansen, M. O. L., Heinrich Hirschel, Ernst, editor, Fujii, Kozo, editor, van Leer, Bram, editor, Morton, Keith William, editor, Pandolfi, Maurizio, editor, Rizzi, Arthur, editor, Roux, Bernard, editor, Haase, Werner, editor, Brandsma, Frans, editor, Elsholz, Eberhard, editor, Leschziner, Michael, editor, and Schwamborn, Dieter, editor

Published
1993
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40. Hubble Space Telescope imaging polarimetry of Mars during the 2003 opposition

Author

Shkuratov, Yu., Kreslavsky, M., Kaydash, V., Videen, G., Bell, J., Wolff, M., Hubbard, M., Noll, K., and Lubenow, A.

Subjects
Astronomy, Earth sciences
Abstract

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.icarus.2005.01.009 Byline: Yu. Shkuratov (a)(b), M. Kreslavsky (a)(c), V. Kaydash (a), G. Videen (d), J. Bell (e), M. Wolff (d), M. Hubbard (e), K. Noll (d), A. Lubenow (d) Abstract: We report results of polarimetric imaging observations of Mars with the Hubble Space Telescope during the 2003 opposition. Through careful calibration, the observations with the ACS camera allow measurements of the polarization degree with an absolute accuracy better than 0.5% and detection of features with polarization degree contrast as small as 0.2%. The general distribution of linear polarization parameters over the Mars disk and their dependence on phase angle and wavelength are well explained qualitatively by a combination of scattering separately by the martian surface and atmosphere. We have discovered transient polarization phenomena interpreted as clouds that are best observed in ultraviolet light. These clouds are optically thin but strongly polarizing, and their origin may be related to atmospheric ice condensation processes. Author Affiliation: (a) Astronomical Institute of Kharkov National University, 35 Sumskaya St., Kharkov 61022, Ukraine (b) Radioastronomical Institute of NASU, 4 Chervonopraporova, Kharkov 61002, Ukraine (c) Department of Geological Sciences, Brown University, Providence, RI 02912, USA (d) Space Science Institute, 3100 Marine Street, Suite A353, Boulder, CO 80303-1058, USA (e) Cornell University, Department of Astronomy, 402 Space Sciences Building, Ithaca, NY 14853-6801, USA

Published
2005

43. Altered arousal response in infants exposed to cigarette smoke. (Original Article)

Author

Chang, A.B., Wilson, S.J., Masters, I.B., Yuill, M., Williams, J., Williams, G., and Hubbard, M.

Subjects
Passive smoking -- Physiological aspects -- Risk factors, Sudden infant death syndrome -- Risk factors, Arousal (Physiology) -- Physiological aspects, Family and marriage, Health, Physiological aspects, Risk factors
Abstract

Aims: A failure of the arousal mechanism is a key feature in the apnoea theory for sudden infant death syndrome (SIDS). In infants studied at an age when the incidence [...]

Published
2003

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