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Träfflista för sökning "AMNE:(NATURAL SCIENCES Physical Sciences) ;lar1:(hj)"

Sökning: AMNE:(NATURAL SCIENCES Physical Sciences) > Jönköping University

  • Resultat 1-10 av 127
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1.
  • Mårtensson, Jan, et al. (författare)
  • Living with heart failure : Depression and quality of life in patients and spouses
  • 2003
  • Ingår i: The Journal of Heart and Lung Transplantation. - Amsterdam : Elsevier. - 1053-2498 .- 1557-3117. ; 22:4, s. 460-467
  • Tidskriftsartikel (refereegranskat)abstract
    • Background: Although spouses are a key support for patients with heart failure, and help them remain in the community, no one has studied patient–spouse pairs to determine the nature of their experience. Therefore, we conducted a study of patients and spouses to compare their levels of depression and health-related quality of life (HRQOL), and to identify factors that contribute to depression and HRQOL in patient–spouse pairs. Methods: Forty-eight couples, in which all patients were men with heart failure, were recruited from a university-affiliated, outpatient heart failure clinic. Data were collected using the Beck Depression Inventory, the 12-item Short Form (that measures physical and mental components of QOL), and the 6-minute walk test. Results: Patients with heart failure were significantly more depressed and had poorer physical quality of life compared with spouses. Patients’ depression was correlated with their own functional status and mental quality of life, with the combination of 6-minute walk distance and mental QOL contributing 51% of the variance in patient depression. Spouse depression and HRQOL did not significantly influence patient depression. In contrast, spouses’ depression was related to their husbands’ functional status and employment, as well as their own mental QOL. The mental component of spouse QOL and the age of the patient accounted for 33% of the adjusted variance in spousal depression. Conclusions: Patients with heart failure and their spouses experience significantly different levels of depression and physical QOL. In developing interventions, it may be important to take these differences into account and focus on their unique needs as well as those issues that affect the couple together. Interventions that improve patient functional status may result in decreased depression and improved HRQOL on the part of both patients and spouses.
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2.
  • Tzanetos, Alexandros, et al. (författare)
  • Nature Inspired Optimization Algorithms Related to Physical Phenomena and Laws of Science : A Survey
  • 2017
  • Ingår i: International journal on artificial intelligence tools. - : World Scientific. - 0218-2130. ; 26:6
  • Tidskriftsartikel (refereegranskat)abstract
    • In the last decade a new variety of nature inspired optimization algorithms has been appeared. After the swarm based models, researchers turned their inspiration in nature phenomena and laws of science. In this way a new category of algorithms was born, equally effective or even sometimes superior to known algorithms for optimization problems, like genetic algorithms and swarm intelligence schemes. The present survey depicts the evolution of research on nature inspired optimization algorithms related to physical phenomena and laws of science and discusses the possibilities of using the presented approaches in a number of different applications. An attempt has been made to draw conclusions on what algorithm could be used in which different problem areas, for those approaches that this information could be extracted from the related papers studied. The paper also underlines the usage of this kind of nature inspired algorithms in industrial research problems, due to their better confrontation with optimization problems represented with nodes and edges. 
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3.
  • Nast, Benjamin, et al. (författare)
  • A modeling approach supporting digital twin engineering : Optimizing the energy consumption of air conditioning facilities
  • 2023
  • Ingår i: 2023 ACM/IEEE International Conference on Model Driven Engineering Languages and Systems Companion (MODELS-C). - : IEEE Computer Society. - 9798350324983 ; , s. 479-483
  • Konferensbidrag (refereegranskat)abstract
    • Digital Twin (DT) is a concept that has become increasingly relevant in recent years. The basic idea is to connect (physical) facilities or devices with digital representations to monitor, manipulate and predict their behavior in real-time. This work presents a modeling approach supporting DT engineering for air conditioning facilities. We describe the architecture of our system for developing digital representations of physically existing facilities in an industrial use case. The paper focuses on (a) the developed modeling tool, (b) the cloud service configuration, and (c) data analysis that enables energy optimizations.
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4.
  • Gunnarsson, Robert, 1972 (författare)
  • Anisotropic spin-orbit interaction revealed by in-plane magnetoresistance in single-oriented SrRuO3 thin films
  • 2012
  • Ingår i: Physical Review B - Condensed Matter and Materials Physics. - : American Physical Society. - 2469-9950 .- 2469-9969 .- 1098-0121 .- 1550-235X. ; 85:23, s. 235409-
  • Tidskriftsartikel (refereegranskat)abstract
    • A detailed analysis of the in-plane magnetoresistance anisotropy in single orientation thin filmSrRuO3 grown on (001)SrTiO3 is presented. The resistivity is measured in strips along [001], [¯110]and [¯11¯1] with in-plane rotating magnetic field. The data show new details in the transfer fromnegative to positive magnetoresistance when the field is rotated in the plane. They show that themagnetoresistance is anisotropic with respect to the crystalline directions rather than with respectto the direction of the current. The data suggest an
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5.
  • Gunnarsson, Robert, 1972, et al. (författare)
  • Magnetoresistance in bicrystal grain-boundary junctions analyzed within the Stoner-Wohlfarth model
  • 2005
  • Ingår i: Journal of Magnetism and Magnetic Materials. - : Elsevier BV. - 0304-8853 .- 1873-4766. ; 290-291:part 1, s. 761-763
  • Tidskriftsartikel (refereegranskat)abstract
    • Experimental data of bicrystal grain boundary magnetoresistance hysteresis shows that the resistance at remanence after saturation depends on whether the magnetic field was applied parallel or perpendicular to the grain boundary. In the latter case the behaviour can be described by the Stoner-Wohlfarth magnetization reversal model for coherent rotation of the magnetization, which leads to an alignment along the easy magnetization directions of the bicrystal in zero field. In the parallel configuration themagnetization directions of the two grains remain parallel in zero field. We have used this information to deduce an effective spin-polarization of P ~ 40 % of the grain boundary in a bicrystal of La0.7Sr0.3MnO3.
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6.
  • Gunnarsson, Robert, 1972, et al. (författare)
  • Misorientation angle dependence of bicrystal magnetoresistance within the model of coherent rotation
  • 2004
  • Ingår i: Journal of Physics: Condensed Matter. - : IOP Publishing. ; 16:21, s. 3761-3768
  • Tidskriftsartikel (refereegranskat)abstract
    • The bicrystal magnetoresistance hysteresis is studied within the model of coherent rotation of magnetization. The magnetoresistance hysteresis is calculated numerically in the limit of fully spin polarized current for symmetric bicrystal junctions with biaxial magnetic anisotropy and of varying misorientation angles. The shape of the curves obtained from the model displays different characteristic features, depending on the angular relationships, which are consistent with experimental data from the literature. The results show a magnetoresistance increasing with increasingmisorientation angle. The influence of biaxial magnetocrystalline anisotropy is reflected in a hump in the maximum magnetoresistance curve at around a misorientation angle of 25 degrees. This structure is absent in the case of uniaxial anisotropy.
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7.
  • Gunnarsson, Robert, 1972, et al. (författare)
  • Stoner-Wohlfarth model applied to bicrystal magnetoresistance hysteresis
  • 2004
  • Ingår i: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 96:1, s. 482-485
  • Tidskriftsartikel (refereegranskat)abstract
    • We calculate numerically the magnetization direction as function of magnetic field in the StonerWohlfarth theory and are able to reproduce the shape of the low-field magnetoresistance hysteresis observed in manganite grain boundary junctions. Moreover, we show that it is necessary to include biaxial magnetocrystalline anisotropy to fully describe the grain boundary magnetoresistance in La0.7Sr0.3MnO3/SrTiO3 bicrystal tunnel junctions.
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8.
  • Kalaboukhov, Alexei, 1975, et al. (författare)
  • Electrical and structural properties of ABO3/SrTiO3 interfaces
  • 2012
  • Ingår i: Materials Research Society Symposium Proceedings. - Warrendale, Pa. : Springer Science and Business Media LLC. - 0272-9172. - 9781605114316 ; 1454, s. 167-172, s. 167-172
  • Konferensbidrag (refereegranskat)abstract
    • Electrical transport and microstructure of interfaces between nm-thick films of various perovskite oxides grown by pulsed laser deposition (PLD) on TiO2 terminated SrTiO3 (STO) substrates are compared. LaAlO3/STO and KTaO3/STO interfaces become quasi-2DEG after a critical film thickness of 4 unit cell layers. The conductivity survives long anneals in oxygen atmosphere. LaMnO3/STO interfaces remain insulating for all film thicknesses and NdGaO3/STO interfaces are conducting but the conductivity is eliminated after oxygen annealing. Medium-energy ion spectroscopy and scanning transmission electron microscopy detect cationic intermixing within several atomic layers from the interface in all studied interfaces. Our results indicate that the electrical reconstruction in the polar oxide interfaces is a complex combination of different mechanisms, and oxygen vacancies play an important role.
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9.
  • Stepantsov, Evgeny, et al. (författare)
  • Ablation replacement of iron with Co, Mn, Ni, and Cu during growth of iron-based superconductor films in the Fe0.9M0.1Se0.92 system
  • 2014
  • Ingår i: Crystallography reports (Print). - 1063-7745 .- 1562-689X. ; 59:5, s. 739-743
  • Tidskriftsartikel (refereegranskat)abstract
    • Thin films of ironbased chalcogenide superconductors FeSe0.92, with iron partially replaced (atleast up to 10 at %) by elements such as cobalt, nickel, manganese, or copper, have been grown on the surfaceof (10 2) LaAlO3 crystals. Growth is performed by the laser ablation of a target prepared in the form of aceramic pellet by hightemperature synthesis and the sintering of preliminarily pressed stoichiometric mixture of powders. Iron in these ceramics is replaced with an alloying metal by no more than 3 at %. The rest(7 at %) of the metal is in the form of precipitates of other phases. Xray diffraction analysis of the grown filmshas shown that they are singlecrystal and free of any precipitates of other crystallographic orientations andphases. This is evidence of the complete (10 at %) replacement of iron with a doping metal in the film structure. This circumstance indicates that the synthesis of components occurs more actively and completely during laser ablation (than in solidphase chemical reactions) as a result of the transformation of multicomponent target material into plasma. Thus, one can fabricate film materials in a wider range of chemical compositions than in the form of solidphase synthesized ceramics.
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10.
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