Search

Your search keyword '"Andersson, J."' showing total 3,257 results
Start Over Author "Andersson, J."
3,257 results on '"Andersson, J."'

1. Structural changes in Ti1-xAlxN coatings during turning: A XANES and EXAFS study of worn tools

Author

Rogström, L., Moreno, M., Andersson, J., Johansson-Jõesaar, M., Odén, M., Klementiev, K., Näslund, L. -Å., and Magnuson, M.

Subjects
Condensed Matter - Materials Science
Abstract

Structural changes in Ti1-xAlxN coated tool inserts used for turning in 316L stainless steel were investigated by XANES, EXAFS, EDS, and STEM. For coarse-grained fcc-structured Ti1-xAlxN coatings, with 0 \leq x \leq 0.62, the XANES spectrum changes with Al-content. XANES Ti 1s line-scans across the rake face of the worn samples reveals that TiN-enriched domains have formed during turning in Ti0.47Al0.53N and Ti0.38Al0.62N samples as a result of spinodal decomposition. The XANES spectra reveal the locations on the tool in which the most TiN-rich domains have formed, indicating which part of the tool-chip contact area that experienced the highest temperature during turning. Changes in the pre-edge features in the XANES spectra reveal that structural changes occur also in the w-TiAlN phase in fine-grained Ti0.38Al0.62N during turning. EDS shows that Cr and Fe from the steel adhere to the tool rake face during machining. Cr 1s and Fe 1s XANES show that Cr is oxidized in the end of the contact length while the adhered Fe retains in the same fcc-structure as that of the 316L stainless steel., Comment: 19 pages, 8 figures

Published
2022
Full Text
View/download PDF

2. Bifurcations and the exchange of stability with coinfection

Author

Andersson, J., Kozlov, V., Tkachev, V. G., and Wennergren, U.

Subjects
Mathematics - Dynamical Systems, 92D30, 35F61, 34D23
Abstract

We perform a bifurcation analysis on an SIR model involving two pathogens that influences each other. Partial cross-immunity is assumed and coinfection is thought to be less transmittable then each of the diseases alone. The susceptible class has density dependent growth with carrying capacity $K$. Our model generalizes the model developed in our previous papers by introducing the possibility for coinfected individuals to spread only one of the diseases when in contact with a susceptible. We perform a bifurcation analysis and prove the existence of a branch of stable equilibrium points parmeterized by $K$. The branch bifurcates for some $K$ resulting in changes in which compartments are present as well as the overall dynamics of the system. Depending on the parameters different transition scenarios occur.

Published
2022

4. Effect of density dependence on coinfection dynamics: part 2

Author

Andersson, J., Ghersheen, S., Kozlov, V., Tkachev, V., and Wennergren, U.

Subjects
Mathematics - Dynamical Systems
Abstract

In this paper we continue the stability analysis of the model for coinfection with density dependent susceptible population introduced in the 1st part of the paper. We look for coexistence equilibrium points, their stability and dependence on the carrying capacity $K$. Two sets of parameter value are determined, each giving rise to different scenarios for the equilibrium branch parametrized by $K$. In both scenarios the branch includes coexistence points implying that both coinfection and single infection of both diseases can exist together in a stable state. There are no simple explicit expression for these equilibrium points and we will require a more delicate analysis of these points with a new bifurcation technique adapted to such epidemic related problems. The first scenario is described by the branch of stable equilibrium points which includes a section of coexistence points starting at a bifurcation equilibrium point with zero second single infections and finishing at another bifurcation point with zero first single infections. In the second scenario the branch also includes a section of coexistence equilibrium points with the same type of starting point but the branch stays inside the positive cone after this. The coexistence equilibrium points are stable at the start of the section. It stays stable as long as the product of $K$ and the rate $\bar \gamma$ of coinfection resulting from two single infections is small but, after this it can reach a Hopf bifurcation and periodic orbits will appear., Comment: 36 pages, 2 diagrams

Published
2021

5. Effect of density dependence on coinfection dynamics

Author

Andersson, J., Ghersheen, S., Kozlov, V., Tkachev, V., and Wennergren, U.

Subjects
Mathematics - Dynamical Systems, 92D30, 35F61, 34D23
Abstract

In this paper we develop an SIR model for coinfection. We discuss how the underlying dynamics depends on the carrying capacity $K$: from a simple dynamics to a more complicated. This can help in understanding of appearance of more complicated dynamics, for example, chaos etc. The density dependent population growth is also considered. It is presented that pathogens can invade in population and their invasion depends on the carrying capacity $K$ which shows that the progression of disease in population depends on carrying capacity. Our approach is based on a bifurcation analysis which allows to generalize considerably the previous Lotka-Volterra type models., Comment: 23 pages

Published
2020

6. Double and triple ionization of isocyanic acid

Author

Eland, J. H. D., Squibb, R. J., Sterling, A. J., Wallner, M., Roos, A. Hult, Andersson, J., Axelsson, V., Johansson, E., Teichter, A., Stranges, S., Brunetti, B., Dyke, J. M., Duarte, F., and Feifel, R.

Subjects
Physics - Atomic and Molecular Clusters
Abstract

Double and triple ionization spectra of isocyanic acid have been measured using multi-electron and ion coincidence techniques combined with synchrotron radiation and compared with high-level theoretical calculations. Vertical double ionization at an energy of 32.8+/-0.3 eV forms the 3A'' ground state in which the HNCO2+ ion is long-lived. The vertical triple ionization energy is determined as 65+/-1 eV. The core-valence double ionization spectra resemble the valence photoelectron spectrum in form, and their main features can be understood on the basis of a simple and rather widely applicable Coulomb model based on the characteristics of the molecular orbitals from which electrons are removed. Characteristics of the most important dissociation channels are examined and discussed., Comment: 15 pages, 6 figures

Published
2019

7. Coulomb explosion of CD3I induced by single photon deep inner-shell ionisation

Author

Wallner, M., Eland, J. H. D., Squibb, R. J., Andersson, J., Roos, A. Hult, Singh, R., Talaee, O., Koulentianos, D., Piancastelli, M. N., Simon, M., and Feifel, R.

Subjects
Physics - Atomic and Molecular Clusters
Abstract

L-shell ionisation and subsequent Coulomb explosion of fully deuterated methyl iodide, CD$_3$I, irradiated with hard x-rays has been examined by a time-of-flight multi-ion coincidence technique. The core vacancies relax efficiently by Auger cascades, leading to charge states up to 16+. The dynamics of the Coulomb explosion process are investigated by calculating the ions' flight times numerically based on a geometric model of the experimental apparatus, for comparison with the experimental data. A parametric model of the explosion, previously introduced for multi-photon induced Coulomb explosion, is applied in numerical simulations, giving good agreement with the experimental results for medium charge states. Deviations for higher charges suggest the need to include nuclear motion in a putatively more complete model. Detection efficiency corrections from the simulations are used to determine the true distributions of molecular charge state produced by initial L1, L2 and L3 ionisation., Comment: 6 pages, 4 figures

Published
2019

8. Double and Triple Ionisation of Isocyanic Acid

Author

Eland, JHD, Squibb, RJ, Sterling, AJ, Wallner, M, Roos, A Hult, Andersson, J, Axelsson, V, Johansson, E, Teichter, A, Stranges, S, Brunetti, B, Dyke, JM, Duarte, F, and Feifel, R

Subjects
Physical Sciences, Chemical Sciences, Atomic, Molecular and Optical Physics, Physical Chemistry
Abstract

Double and triple ionisation spectra of the reactive molecule isocyanic acid (HNCO) have been measured using multi-electron and ion coincidence techniques combined with synchrotron radiation and compared with high-level theoretical calculations. Vertical double ionisation at an energy of 32.8 ± 0.3 eV forms the 3A" ground state in which the HNCO2+ ion is long lived. The vertical triple ionisation energy is determined as 65 ± 1 eV. The core-valence double ionisation spectra resemble the valence photoelectron spectrum in form, and their main features can be understood on the basis of a simple and rather widely applicable Coulomb model based on the characteristics of the molecular orbitals from which electrons are removed. Characteristics of the most important dissociation channels are examined and discussed.

Published
2020

10. Results of an interlaboratory study on the working curve in vat photopolymerization

Author

Kolibaba, T, Killgore, J, Caplins, B, Higgins, C, Arp, U, Miller, C, Poster, D, Zong, Y, Broce, S, Wang, T, Talacka, V, Andersson, J, Davenport, A, Panzer, M, Tumbleston, J, Gonzalez, J, Huffstetler, J, Lund, B, Billerbeck, K, Clay, A, Fratarcangeli, M, Qi, H, Porcincula, D, Bezek, L, Kikuta, K, Pearlson, M, Walker, D, Long, C, Hasa, E, Aguirre-Soto, A, Celis-Guzman, A, Backman, D, Sridhar, R, Cavicchi, K, Viereckl, R, Tong, E, Hansen, C, Shah, D, Kinane, C, Pena-Francesch, A, Antonini, C, Chaudhary, R, Muraca, G, Bensouda, Y, Zhang, Y, Zhao, X, Kolibaba T. J., Killgore J. P., Caplins B. W., Higgins C. I., Arp U., Miller C. C., Poster D. L., Zong Y., Broce S., Wang T., Talacka V., Andersson J., Davenport A., Panzer M. A., Tumbleston J. R., Gonzalez J. M., Huffstetler J., Lund B. R., Billerbeck K., Clay A. M., Fratarcangeli M. R., Qi H. J., Porcincula D. H., Bezek L. B., Kikuta K., Pearlson M. N., Walker D. A., Long C. J., Hasa E., Aguirre-Soto A., Celis-Guzman A., Backman D. E., Sridhar R. L., Cavicchi K. A., Viereckl R. J., Tong E., Hansen C. J., Shah D. M., Kinane C., Pena-Francesch A., Antonini C., Chaudhary R., Muraca G., Bensouda Y., Zhang Y., Zhao X., Kolibaba, T, Killgore, J, Caplins, B, Higgins, C, Arp, U, Miller, C, Poster, D, Zong, Y, Broce, S, Wang, T, Talacka, V, Andersson, J, Davenport, A, Panzer, M, Tumbleston, J, Gonzalez, J, Huffstetler, J, Lund, B, Billerbeck, K, Clay, A, Fratarcangeli, M, Qi, H, Porcincula, D, Bezek, L, Kikuta, K, Pearlson, M, Walker, D, Long, C, Hasa, E, Aguirre-Soto, A, Celis-Guzman, A, Backman, D, Sridhar, R, Cavicchi, K, Viereckl, R, Tong, E, Hansen, C, Shah, D, Kinane, C, Pena-Francesch, A, Antonini, C, Chaudhary, R, Muraca, G, Bensouda, Y, Zhang, Y, Zhao, X, Kolibaba T. J., Killgore J. P., Caplins B. W., Higgins C. I., Arp U., Miller C. C., Poster D. L., Zong Y., Broce S., Wang T., Talacka V., Andersson J., Davenport A., Panzer M. A., Tumbleston J. R., Gonzalez J. M., Huffstetler J., Lund B. R., Billerbeck K., Clay A. M., Fratarcangeli M. R., Qi H. J., Porcincula D. H., Bezek L. B., Kikuta K., Pearlson M. N., Walker D. A., Long C. J., Hasa E., Aguirre-Soto A., Celis-Guzman A., Backman D. E., Sridhar R. L., Cavicchi K. A., Viereckl R. J., Tong E., Hansen C. J., Shah D. M., Kinane C., Pena-Francesch A., Antonini C., Chaudhary R., Muraca G., Bensouda Y., Zhang Y., and Zhao X.

Abstract

The working curve informs resin properties and print parameters for stereolithography, digital light processing, and other photopolymer additive manufacturing (PAM) technologies. First demonstrated in 1992, the working curve measurement of cure depth vs radiant exposure of light is now a foundational measurement in the field of PAM. Despite its widespread use in industry and academia, there is no formal method or procedure for performing the working curve measurement, raising questions about the utility of reported working curve parameters. Here, an interlaboratory study (ILS) is described in which 24 individual laboratories performed a working curve measurement on an aliquot from a single batch of PAM resin. The ILS reveals that there is enormous scatter in the working curve data and the key fit parameters derived from it. The measured depth of light penetration Dp varied by as much as 7x between participants, while the critical radiant exposure for gelation Ec varied by as much as 70x. This significant scatter is attributed to a lack of common procedure, variation in light engines, epistemic uncertainties from the Jacobs equation, and the use of measurement tools with insufficient precision. The ILS findings highlight an urgent need for procedural standardization and better hardware characterization in this rapidly growing field.

Published
2024

11. Position paper to facilitate patient access to radiopharmaceuticals: considerations for a suitable pharmaceutical regulatory framework

Author

Korde, A, Patt, M, Selivanova, S, Scott, A, Hesselmann, R, Kiss, O, Ramamoorthy, N, Todde, S, Rubow, S, Gwaza, L, Lyashchenko, S, Andersson, J, Hockley, B, Kaslival, R, Decristoforo, C, Korde A., Patt M., Selivanova S. V., Scott A. M., Hesselmann R., Kiss O., Ramamoorthy N., Todde S., Rubow S. M., Gwaza L., Lyashchenko S., Andersson J., Hockley B., Kaslival R., Decristoforo C., Korde, A, Patt, M, Selivanova, S, Scott, A, Hesselmann, R, Kiss, O, Ramamoorthy, N, Todde, S, Rubow, S, Gwaza, L, Lyashchenko, S, Andersson, J, Hockley, B, Kaslival, R, Decristoforo, C, Korde A., Patt M., Selivanova S. V., Scott A. M., Hesselmann R., Kiss O., Ramamoorthy N., Todde S., Rubow S. M., Gwaza L., Lyashchenko S., Andersson J., Hockley B., Kaslival R., and Decristoforo C.

Abstract

Background: Nuclear medicine has made enormous progress in the past decades. However, there are still significant inequalities in patient access among different countries, which could be mitigated by improving access to and availability of radiopharmaceuticals. Main body: This paper summarises major considerations for a suitable pharmaceutical regulatory framework to facilitate patient access to radiopharmaceuticals. These include the distinct characteristics of radiopharmaceuticals which require dedicated regulations, considering the impact of the variable complexity of radiopharmaceutical preparation, personnel requirements, manufacturing practices and quality assurance, regulatory authority interfaces, communication and training, as well as marketing authorisation procedures to ensure availability of radiopharmaceuticals. Finally, domestic and regional supply to ensure patient access via alternative regulatory pathways, including in-house production of radiopharmaceuticals, is described, and an outlook on regulatory challenges faced by new developments, such as the use of alpha emitters, is provided. Conclusions: All these considerations are an outcome of a dedicated Technical Meeting organised by the IAEA in 2023 and represent the views and opinions of experts in the field, not those of any regulatory authorities.

Published
2024

17. The IAHS Science for Solutions decade, with Hydrology Engaging Local People IN one Global world (HELPING)

Author

Arheimer, B., Cudennec, C., Castellarin, A., Grimaldi, S., Heal, K., Lupton, C., Sarkar, A., Tian, F., Kileshye Onema, J.-M., Archfield, S., Blöschl, G., Chaffe, P., Croke, B., Dembélé, M., Leong, C., Mijic, A., Mosquera, G., Nlend, B., Olusola, A., Polo, M., Sandells, M., Sheffield, J., van Hateren, T., Shafiei, M., Adla, S., Agarwal, A., Aguilar, C., Andersson, J., Andraos, C., Andreu, A., Avanzi, F., Bart, R., Bartosova, A., Batelaan, O., Bennett, J., Bertola, M., Bezak, N., Boekee, J., Bogaard, T., Booij, M., Brigode, P., Buytaert, W., Bziava, K., Castelli, G., Castro, C., Ceperley, N., Chidepudi, S., Chiew, F., Chun, K., Dagnew, A., Dekongmen, B.W., Del Jesus, M., Dezetter, A., Do Nascimento Batista, J., Doble, R., Dogulu, N., Eekhout, J., Elçi, A., Elenius, M., Finger, D., Fiori, A., Fischer, S., Förster, K., Ganora, D., Gargouri Ellouze, E., Ghoreishi, M., Harvey, N., Hrachowitz, M., Jampani, M., Jaramillo, F., Jongen, H., Kareem, K., Khan, U., Khatami, S., Kingston, D., Koren, G., Krause, S., Kreibich, H., Lerat, J., Liu, J., Liu, S., Madruga de Brito, M., Mahé, G., Makurira, H., Mazzoglio, P., Merheb, M., Mishra, A., Mohammad, H., Montanari, A., Mujere, N., Nabavi, E., Nkwasa, A., Orduna Alegria, M., Orieschnig, C., Ovcharuk, V., Palmate, S., Pande, S., Pandey, S., Papacharalampous, G., Pechlivanidis, I., Penny, G., Pimentel, R., Post, D., Prieto, C., Razavi, S., Salazar-Galán, S., Sankaran Namboothiri, A., Santos, P., Savenije, H., Shanono, N., Sharma, A., Sivapalan, M., Smagulov, Z., Szolgay, J., Teng, J., Teuling, A., Teutschbein, C., Tyralis, H., van Griensven, A., van Schalkwyk, A., van Tiel, M., Viglione, A., Volpi, E., Wagener, T., Wang, X., Wang-Erlandsson, L., Wens, M., Xia, J., Arheimer, B., Cudennec, C., Castellarin, A., Grimaldi, S., Heal, K., Lupton, C., Sarkar, A., Tian, F., Kileshye Onema, J.-M., Archfield, S., Blöschl, G., Chaffe, P., Croke, B., Dembélé, M., Leong, C., Mijic, A., Mosquera, G., Nlend, B., Olusola, A., Polo, M., Sandells, M., Sheffield, J., van Hateren, T., Shafiei, M., Adla, S., Agarwal, A., Aguilar, C., Andersson, J., Andraos, C., Andreu, A., Avanzi, F., Bart, R., Bartosova, A., Batelaan, O., Bennett, J., Bertola, M., Bezak, N., Boekee, J., Bogaard, T., Booij, M., Brigode, P., Buytaert, W., Bziava, K., Castelli, G., Castro, C., Ceperley, N., Chidepudi, S., Chiew, F., Chun, K., Dagnew, A., Dekongmen, B.W., Del Jesus, M., Dezetter, A., Do Nascimento Batista, J., Doble, R., Dogulu, N., Eekhout, J., Elçi, A., Elenius, M., Finger, D., Fiori, A., Fischer, S., Förster, K., Ganora, D., Gargouri Ellouze, E., Ghoreishi, M., Harvey, N., Hrachowitz, M., Jampani, M., Jaramillo, F., Jongen, H., Kareem, K., Khan, U., Khatami, S., Kingston, D., Koren, G., Krause, S., Kreibich, H., Lerat, J., Liu, J., Liu, S., Madruga de Brito, M., Mahé, G., Makurira, H., Mazzoglio, P., Merheb, M., Mishra, A., Mohammad, H., Montanari, A., Mujere, N., Nabavi, E., Nkwasa, A., Orduna Alegria, M., Orieschnig, C., Ovcharuk, V., Palmate, S., Pande, S., Pandey, S., Papacharalampous, G., Pechlivanidis, I., Penny, G., Pimentel, R., Post, D., Prieto, C., Razavi, S., Salazar-Galán, S., Sankaran Namboothiri, A., Santos, P., Savenije, H., Shanono, N., Sharma, A., Sivapalan, M., Smagulov, Z., Szolgay, J., Teng, J., Teuling, A., Teutschbein, C., Tyralis, H., van Griensven, A., van Schalkwyk, A., van Tiel, M., Viglione, A., Volpi, E., Wagener, T., Wang, X., Wang-Erlandsson, L., Wens, M., and Xia, J.

Abstract

The new scientific decade (2023-2032) of the International Association of Hydrological Sciences (IAHS) aims at searching for sustainable solutions to undesired water conditions – whether it be too little, too much or too polluted. Many of the current issues originate from global change, while solutions to problems must embrace local understanding and context. The decade will explore the current water crises by searching for actionable knowledge within three themes: global and local interactions, sustainable solutions and innovative cross-cutting methods. We capitalise on previous IAHS Scientific Decades shaping a trilogy; from Hydrological Predictions (PUB) to Change and Interdisciplinarity (Panta Rhei) to Solutions (HELPING). The vision is to solve fundamental water-related environmental and societal problems by engaging with other disciplines and local stakeholders. The decade endorses mutual learning and co-creation to progress towards UN sustainable development goals. Hence, HELPING is a vehicle for putting science in action, driven by scientists working on local hydrology in coordination with local, regional, and global processes.

Published
2024
Full Text
View/download PDF

18. Position Paper to facilitate patient access to radiopharmaceuticals - considerations for a suitable pharmaceutical regulatory framework

Author

Korde, A., Patt, M., Selivanova, S., Scott, A., Hesselmann, R., (0000-0001-7431-0026) Kiß, O., Ramamoorthy, N., Todde, S., Rubow, S., Gwaza, L., Lyashchenko, S., Andersson, J., Hockley, B., Kaslival, R., Decristoforo, C., Korde, A., Patt, M., Selivanova, S., Scott, A., Hesselmann, R., (0000-0001-7431-0026) Kiß, O., Ramamoorthy, N., Todde, S., Rubow, S., Gwaza, L., Lyashchenko, S., Andersson, J., Hockley, B., Kaslival, R., and Decristoforo, C.

Abstract

Nuclear medicine has made enormous progress in the past decades. However, there are still significant inequalities in patient access among different countries, which could be mitigated by a suitable pharmaceutical regulatory framework and associated guidelines. This paper summarizes major considerations for a suitable pharmaceutical regulatory framework to facilitate patient access to radiopharmaceuticals. These include the distinct characteristics of radiopharmaceuticals advocating dedicated regulations, the impact of variable complexity of radiopharmaceutical preparation, personnel requirements, manufacturing practices and quality assurance, regulatory authorities interfaces, communication and training, as well as marketing authorization procedures to ensure availability of radiopharmaceuticals. Finally domestic and regional supply to ensure patient access via alternative regulatory pathways, including in-house production of radiopharmaceuticals, is described and an outlook on regulatory challenges faced by new developments, such as the use of alpha emitters, is provided. All these considerations are an outcome of a dedicated Technical Meeting organized by the IAEA in 2023.

Published
2024

24. Abbreviated versus standard dual antiplatelet therapy time after PCI in high bleeding risk patients with acute coronary syndrome - a report from the SWEDEHEART registry

Author

Haakansson, A, primary, Koul, S, additional, Omerovic, E, additional, Andersson, J, additional, Agewall, S, additional, James, S, additional, Mokhtari, A, additional, Van Der Pals, J, additional, Wester, A, additional, Szummer, K, additional, Jernberg, T, additional, Erlinge, D, additional, and Mohammad, M A, additional

Published
2023
Full Text
View/download PDF

26. A parabolic free boundary problem with Bernoulli type condition on the free boundary

Author

Andersson, J. and Weiss, G. S.

Subjects
Mathematics - Analysis of PDEs, 35R35, 35K55
Abstract

Consider the parabolic free boundary problem $$ \Delta u - \partial_t u = 0 \textrm{in} \{u>0\}, |\nabla u|=1 \textrm{on} \partial\{u>0\} . $$ For a realistic class of solutions, containing for example {\em all} limits of the singular perturbation problem $$\Delta u_\epsilon - \partial_t u_\epsilon = \beta_\epsilon(u_\epsilon) \textrm{as} \epsilon\to 0,$$ we prove that one-sided flatness of the free boundary implies regularity. In particular, we show that the topological free boundary $\partial\{u>0\}$ can be decomposed into an {\em open} regular set (relative to $\partial\{u>0\}$) which is locally a surface with H\"older-continuous space normal, and a closed singular set. Our result extends the main theorem in the paper by H.W. Alt-L.A. Caffarelli (1981) to more general solutions as well as the time-dependent case. Our proof uses methods developed in H.W. Alt-L.A. Caffarelli (1981), however we replace the core of that paper, which relies on non-positive mean curvature at singular points, by an argument based on scaling discrepancies, which promises to be applicable to more general free boundary or free discontinuity problems.

Published
2006

27. Formation and relaxation of K−2 and K−2V double-core-hole states in n-butane.

Author

Koulentianos, D., Carravetta, V., Couto, R. C., Andersson, J., Hult Roos, A., Squibb, R. J., Wallner, M., Eland, J. H. D., Simon, M., Ågren, H., and Feifel, R.

Subjects
ELECTRON configuration, IONIZATION energy, ELECTRONS, COINCIDENCE
Abstract

Using a magnetic bottle multi-electron time-of-flight spectrometer in combination with synchrotron radiation, double-core-hole pre-edge and continuum states involving the K-shell of the carbon atoms in n-butane (n-C4H10) have been identified, where the ejected core electron(s) and the emitted Auger electrons from the decay of such states have been detected in coincidence. An assignment of the main observed spectral features is based on the results of multi-configurational self-consistent field (MCSCF) calculations for the excitation energies and static exchange (STEX) calculations for energies and intensities. MCSCF results have been analyzed in terms of static and dynamic electron relaxation as well as electron correlation contributions to double-core-hole state ionization potentials. The analysis of applicability of the STEX method, which implements the one-particle picture toward the complete basis set limit, is motivated by the fact that it scales well toward large species. We find that combining the MCSCF and STEX techniques is a viable approach to analyze double-core-hole spectra. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

28. Cross-shaped and Degenerate Singularities in an Unstable Elliptic Free Boundary Problem

Author

Andersson, J. and Weiss, G. S.

Subjects
Mathematics - Analysis of PDEs, 35R35, 35J60
Abstract

We investigate singular and degenerate behavior of solutions of the unstable free boundary problem $$\Delta u = -\chi_{\{u>0\}} .$$ First, we construct a solution that is not of class $C^{1,1}$ and whose free boundary consists of four arcs meeting in a {\em cross}-shaped singularity. This solution is completely unstable/repulsive from above and below which would make it hard to get by the usual methods, and even numerics is non-trivial. We also show existence of a degenerate solution. This answers two of the open questions in a recent paper by R. Monneau-G.S. Weiss.

Published
2005
Full Text
View/download PDF

29. The Relation between Students' Communicative Moves during Laboratory Work in Physics and Outcomes of Their Actions

Author

Andersson, J. and Enghag, M.

Abstract

In this case study, we explore students' communication during practical work in physics at an upper secondary school in Sweden from a sociocultural perspective. We investigate the relation between the interaction and content of students' communication and outcomes of their actions, with the purpose of finding new knowledge for informing teachers in their choice of instruction. We make discourse analysis of how students interact but also of what students are discussing in terms of underlying content at a linguistic and cognitive level. Twenty students divided into five groups were video recorded while performing four practical tasks at different stations during laboratory work about motion. An analytical framework was developed and applied for one group to three parts of the transcripts in which three different talk-types occurred. Discursive, content, action and purposive moves in the process were identified for each talk-type at both linguistic and cognitive levels. These moves represent information concerning what the teacher actually assigns students to do, and how students make meaning of the activities. Through these different communicative moves, students experience how laboratory work can enhance their competence to collaborate in a scientific environment with complex practical and theoretical questions to solve quickly. Implications of the findings are discussed.

Published
2017
Full Text
View/download PDF

30. DENSITY-DEPENDENT FEEDBACK IN AGE-STRUCTURED POPULATIONS

Author

Andersson, J., Kozlov, V.A., Tkachev, V.G., Radosavljevic, S., and Wennergren, U.

Subjects
Population biology -- Analysis, Numerical analysis -- Analysis, Extinction (Biology) -- Analysis, Mathematics
Abstract

The population size has far-reaching effects on the fitness of a population that in turn influences the population extinction or persistence. Understanding the density- and age-dependent factors will facilitate more accurate predictions about the population dynamics and its asymptotic behavior. In this paper, we develop a rigorous mathematical analysis of the study of positive and negative effects of the increased population density in the classical nonlinear age-structured population model. One of the main results expresses the global stability of the system in terms of the newborn function only. We establish the existence of a threshold population size implying the population extinction, which is well known in the population dynamics as the Allee effect. Bibliography: 18 titles. Illustrations: 1 figure. Dedicated to N. N. Uraltseva on the occasion of her 85th birthday, 1 Introduction In biological populations, the density-dependent regulation represents a change in individual fitness caused by changes in the population size or density. The negative density- dependence, often explained by [...]

Published
2019
Full Text
View/download PDF

31. TLTF in cerebrospinal fluid for detection and staging of T. b. gambiense infection

Author

McKerrow, James, Abdulla, MH, Bakhiet, M, Lejon, V, Andersson, J, Al-Obeed, O, and Harris, RA

Abstract

Background: Trypanosome-derived lymphocyte triggering factor (TLTF) is a molecule released by African trypanosomes that interacts with the host immune system, resulting in increased levels of IFN-γ production. Methodology/Principal findings: TLTF and anti-

Published
2013

43. Emissionsverhalten von Euro 6b bis Euro 6d-TEMP Diesel-Pkw innerhalb und auserhalb der RDE-Bedingungen /Emissions Control Performance of Euro 6b to Euro 6d-TEMP Diesel Cars within and outside of RDE C...

Author

Williams, R., primary, Andersson, J., additional, Hamje, H., additional, Ziman, P., additional, Kar, K., additional, Fittavolini, C., additional, Pellegrini, L., additional, Gunter, G., additional, Oliva, F., additional, and Rogerson, J., additional

Published
2019
Full Text
View/download PDF

44. Incidence, type of atrial fibrillation and risk factors for stroke: a population-based cohort study

Author

Johansson C, Dahlqvist E, Andersson J, Jansson JH, and Johansson L

Subjects
atrial fibrillation, atrial flutter, incidence, risk factors for stroke, Infectious and parasitic diseases, RC109-216
Abstract

Cecilia Johansson, Erik Dahlqvist, Jonas Andersson, Jan-Håkan Jansson, Lars Johansson Department of Public Health and Clinical Medicine, Skellefteå Research Unit, Umeå University, Umeå, Västerbotten, Sweden Purpose: The aims of this study were to estimate the incidence of atrial fibrillation and atrial flutter (AF), to assess the presence of provoking factors and risk factors for stroke and systemic embolism, and to determine the type of AF in patients with first-diagnosed AF. Patients and methods: This cohort study was performed in northern Sweden between January 1, 2011 and December 31, 2012. Diagnosis registries were searched for the International Classification of Diseases-10 code for AF (I48) to identify cases of incident AF. All AF diagnoses were electrocardiogram-verified. Data pertaining to provoking factors, type of AF and presence of risk factors for stroke and systemic embolism according to the CHA2DS2-VASc score were obtained from medical records. Results: The incidence of AF in the entire population was 4.0 per 1,000 person-years. The incidence was 27.5 per 1,000 person-years in patients aged ≥80 years. A total of 21% of all patients had a provoking factor in association with the first-diagnosed episode of AF. The CHA2DS2-VASc score was 2 or higher in 81% of the patients. Permanent AF was the most common type of AF (29%). Conclusion: There was a considerable increase in the incidence of AF with age, and a provoking factor was found in one-fifth. The most common type of AF was permanent AF. Four in five patients had a CHA2DS2-VASc score of 2 or more. Keywords: atrial fibrillation, atrial flutter, incidence, risk factors for stroke

Published
2017

48. Mechanical integrity of PVD TiAlN-coated PcBN: Influence of substrate bias voltage and microstructural assemblage

Author

Universitat Politècnica de Catalunya. Departament de Ciència i Enginyeria de Materials, Universitat Politècnica de Catalunya. CIEFMA-PROCOMAME - Disseny Microestructural i Fabricació Avançada de Materials, Gordon Pozuelo, Sandra, Rodriguez Suarez, Teresa, Roa Rovira, Joan Josep, M'Saoubi, Rachid, Andersson, J. M., Jiménez Piqué, Emilio, Llanes Pitarch, Luis Miguel, Universitat Politècnica de Catalunya. Departament de Ciència i Enginyeria de Materials, Universitat Politècnica de Catalunya. CIEFMA-PROCOMAME - Disseny Microestructural i Fabricació Avançada de Materials, Gordon Pozuelo, Sandra, Rodriguez Suarez, Teresa, Roa Rovira, Joan Josep, M'Saoubi, Rachid, Andersson, J. M., Jiménez Piqué, Emilio, and Llanes Pitarch, Luis Miguel

Abstract

Polycrystalline cubic boron nitrides (PcBN) have been increasingly used together with PVD coatings, mainly for hard turning operations. Within this context, effectiveness of coated PcBN as cutting tool is usually addressed by evaluation of its machining performance. Meanwhile, studies aiming to assess and understand the correlation between microstructural features and mechanical behaviour of the coating-substrate system are rather limited. Aiming to overcome such lack of information, in this study the influence of substrate bias voltage (-35¿V as compared to -60¿V) and microstructural assemblage (as a function of cBN content and binder chemical nature) on the mechanical integrity of TiAlN-coated PcBN systems is investigated. In doing so, contact damage response and coating adhesion strength of different coated-PcBNs are evaluated by means of indentation testing using distinct loading conditions (static and sliding) and tip geometries (spherical and conical). Such testing program is complemented by detailed FESEM inspection of the involved failure micromechanisms, as well as microstructural and micromechanical characterization of the deposited films. Results indicate that resistance against crack nucleation and propagation of coated PcBN, induced by either spherical or conical indentation, is enhanced by using harder (high content of cBN particles) and tougher (metallic binder) substrates (H-PcBN). Regarding bias voltage, systems with coatings deposited using a higher value (-60¿V as compared to -35¿V) show improved adhesive strength, this being particularly true for combinations involving low cBN content and ceramic binder substrate (L-PcBN). Similar beneficial effect was found, but exclusively in coated L-PcBN systems, regarding resistance to radial cracking emergence and to material removal through cohesive-failure chipping induced in Rockwell C tests. Although these findings are linked to the higher compressive residual stresses exhibited by coatings deposited un, The study was supported by the Spanish Government (Ministerio de Ciencia, Innovación y Universidades and Agencia Estatal de Investigación) and European Union (FEDER) through the projects PID2021-126614OB-100 and PID2022-137274NB-C32, as well as by an industry-university collaborative program among Element Six (UK) Ltd., Seco Tools AB and Universitat Politècnica de Catalunya. Authors acknowledge Mikael Fallqvist (Karlstad University) for support in conducting the scratch test experiments at Seco Tools., Peer Reviewed, Postprint (published version)

Published
2023

49. Structural changes in Ti1-xAlxN coatings during turning : A XANES and EXAFS study of worn tools

Author

Rogström, Lina, Moreno, Maiara, Andersson, J. M., Johansson-Jöesaar, M. P., Odén, Magnus, Klementiev, K., Näslund, Lars-Åke, Magnuson, Martin, Rogström, Lina, Moreno, Maiara, Andersson, J. M., Johansson-Jöesaar, M. P., Odén, Magnus, Klementiev, K., Näslund, Lars-Åke, and Magnuson, Martin

Abstract

Structural changes in Ti1-xAlxN coated tool inserts used for turning in 316L stainless steel were investigated by XANES, EXAFS, EDS, and STEM. For coarse-grained fcc-structured Ti1-xAlxN coatings, with 0 ≤ x ≤ 0.62, the XANES spectrum changes with Al-content. XANES Ti 1s line-scans across the rake face of the worn samples reveals that TiN-enriched domains have formed during turning in Ti0.47Al0.53N and Ti0.38Al0.62N samples as a result of spinodal decomposition. The XANES spectra reveal the locations on the tool in which the most TiN-rich domains have formed, indicating which part of the tool-chip contact area that experienced the highest temperature during turning. Changes in the pre-edge features in the XANES spectra reveal that structural changes occur also in the w-TiAlN phase in fine-grained Ti0.38Al0.62N during turning. EDS shows that Cr and Fe from the steel adhere to the tool rake face during machining. Cr 1s and Fe 1s XANES show that Cr is oxidized in the end of the contact length while the adhered Fe retains in the same fcc-structure as that of the 316L stainless steel., Funding agencies: Swedish Governmental Agency for Innovation Systems (Vinnova) [2018-04417]; VINNOVA [2016-05156]; Swedish Research council [2018-07152]; Swedish Governmental Agency for Innovation Systems [2018-04969]; Formas [2019-02496]

Published
2023
Full Text
View/download PDF

50. Experienced processes and outcomes of driving license withdrawal due to visual field loss : A Swedish survey study of trust in authorities

Author

Nyberg, J., Andersson, J., Strandberg, Thomas, Nyberg, J., Andersson, J., and Strandberg, Thomas

Abstract

Citizen perceptions of justice, regarding both processes and outcomes, are closely related to the perceived legitimacy of the authorities involved and are thus significant for trust. This study investigates how a withdrawn driving license due to visual field loss might affect trust in the authorities involved in withdrawal processes and outcomes: the health-care system, the Swedish Transport Agency, and the judicial system. The factors influencing trust were investigated as was whether the withdrawal experience had changed the trust in other authorities not involved in the withdrawal process. Also, the aetiology of the visual field loss and gender were investigated. A survey study was conducted in which 402 Swedish respondents with visual field loss and a withdrawal experience participated. Variance, regression, and content analyses were conducted. The following conceptual factors were used in understanding trust: Benevolence, Openness, Integrity, Ability, and Value Congruence. The results revealed that processes and outcomes affected the overall trust in all three authorities, although the highest trust was in the health-care system (but still low). Diagnosis, but not gender, was important for the experienced trust. Differences in levels of trust in each authority were related to the aetiology of the diagnosis. Benevolence and Ability were the trust factors most important for overall trust in the health-care system and the Swedish Transport Agency. For some respondents (46%), the negative experiences of the withdrawal had worsened their trust in other, not involved authorities, as well. © 2023 The Author(s)

Published
2023
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results