3,015 research outputs found
Many Body Problems with "Spin"-Related Contact Interactions
We study quantum mechanical systems with "spin"-related contact interactions
in one dimension. The boundary conditions describing the contact interactions
are dependent on the spin states of the particles. In particular we investigate
the integrability of -body systems with -interactions and point spin
couplings. Bethe ansatz solutions, bound states and scattering matrices are
explicitly given. The cases of generalized separated boundary condition and
some Hamiltonian operators corresponding to special spin related boundary
conditions are also discussed.Comment: 13 pages, Late
Magneto-structural coupling and harmonic lattice dynamics in CaFeAs probed by M\"ossbauer spectroscopy
In this paper we present detailed M\"ossbauer spectroscopy study of
structural and magnetic properties of the undoped parent compound
CaFeAs single crystal. By fitting the temperature dependence of the
hyperfine magnetic field we show that the magneto-structural phase transition
is clearly first-order in nature and we also deduced the compressibility of our
sample to be . Within the Landau's theory of phase
transition, we further argue that the observed phase transition may stem from
the strong magneto-structural coupling effect. Temperature dependence of the
Lamb-M\"ossbauer factor show that the paramagnetic phase and the
antiferromagnetic phase exhibit similar lattice dynamics in high frequency
modes with very close Debye temperatures, 270\,K.Comment: 6 pages,5 figures Accepted by J. Phys.: Condens. Matte
On the dynamics of transfer-ionization in fast ion-atomic collisions
We consider trasfer-ionization in collisions of fast (3.6 -- 11 MeV/u)
protons, alpha-particles and lithium nuclei with helium atoms. There are just a
few basic mechanisms contributing to this process which can be grouped into
correlated ones, which crucially depend on the electron-electron interaction,
and uncorrelated, which do not need this interaction to proceed. We show that
by exploring momentum spectra of the emitted electrons the correlated and
uncorrelated mechanisms can be cleary separated from each other. This
exploration also enables one to get insight into subtle details of the dynamics
of transfer-ionization.Comment: 12 pages. 7 figure
The Effect of COVID-19 On Antibiotic Resistance
Over three years have passed since the beginning of the COVID-19 pandemic. During these times we have experienced significant changes in all areas of our life. In healthcare, more attention was focused on COVID-19 than other concerns. An unexpected consequence of the pandemic was a silent progression of an increased spread of multi-resistant pathogens. While antibiotic use during the pandemic varied across healthcare settings, antibiotics were prescribed for COVID-19 patients, even though antibiotics are known not to be effective against viruses.1 In dentistry, antibiotics were prescribed to prevent potential dental infections, since many dental offices were not open. Antimicrobial resistance was one of our greatest public health concerns prior to the COVID-19 pandemic, and it remains so
Evolutionary biology: a basic science for psychiatry?
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/65529/1/j.1600-0447.1992.tb03234.x.pd
Electronic Structure, Magnetism and Superconductivity of Layered Iron Compounds
The layered iron superconductors are discussed using electronic structure
calculations. The four families of compounds discovered so far, including
Fe(Se,Te) have closely related electronic structures. The Fermi surface
consists of disconnected hole and electron cylinders and additional hole
sections that depend on the specific material. This places the materials in
proximity to itinerant magnetism, both due to the high density of states and
due to nesting. Comparison of density functional results and experiment
provides strong evidence for itinerant spin fluctuations, which are discussed
in relation to superconductivity. It is proposed that the intermediate phase
between the structural transition and the SDW transition in the oxy-pnictides
is a nematic phase.Comment: Proceedings ISS200
Does CSR Influence firm performance indicators? evidence from Chinese pharmaceutical enterprises
This research is carried out in the backdrop of increasing product quality and environmental degradation scandals associated with Chinese Pharmaceuticals in recent years. We examine the data of 125 Chinese Pharmaceuticals between 2010-2016 to investigate the impact of overall CSR (Corporate Social Responsibility) performance as well as five unique aspects of CSR performance such as shareholders, employees, customers and suppliers, environmental practices, and the society to gauge the impact of these individual dimensions on firm’s financial performance. A mixed method approach is adopted where twenty experts from the Pharmaceutical industry firstly rate the importance of different stakeholder dimensions based on a five-point Lickert scale. Subsequently, the CSR scoring system is developed by incorporating the weighted average of experts’ scores and the performance of CSR indicators obtained from the Hexun CSR rating. The firm performance is measured by Tobin’s Q, ROA, ROE, and EPS ratios. The outcome of panel based regression models reveal that CSR has a positive and significant influence on firm’s financial performance. Moreover, although all the CSR dimensions relate positively to firm performance nonetheless environmental aspect of CSR has the most profound impact on firm performance followed by customer & suppliers, and employees. However, shareholders and society dimensions have relatively lesser influence on firm performance. These results imply that Chinese Pharmaceuticals shall further optimize their CSR performance as it can not only create a favorable brand image for various stakeholders but also results in superior financial performance.info:eu-repo/semantics/publishedVersio
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