141 research outputs found
Structural and electrical transport properties of superconducting Au{0.7}In{0.3} films: A random array of superconductor-normal metal-superconductor (SNS) Josephson junctions
The structural and superconducting properties of Au{0.7}In{0.3} films, grown
by interdiffusion of alternating Au and In layers, have been studied. The films
were found to consist of a uniform solid solution of Au{0.9}In{0.1}, with
excess In precipitated in the form of In-rich grains of various Au-In phases
(with distinct atomic compositions), including intermetallic compounds. As the
temperature was lowered, these individual grains became superconducting at a
particular transition temperature (Tc), determined primarily by the atomic
composition of the grain, before a fully superconducting state of zero
resistance was established. From the observed onset Tc, it was inferred that up
to three different superconducting phases could have formed in these
Au{0.7}In{0.3} films, all of which were embedded in a uniform Au{0.9}In{0.1}
matrix. Among these phases, the Tc of a particular one, 0.8 K, is higher than
any previously reported for the Au-In system. The electrical transport
properties were studied down to low temperatures. The transport results were
found to be well correlated with those of the structural studies. The present
work suggests that Au{0.7}In{0.3} can be modeled as a random array of
superconductor-normal metal-superconductor (SNS) Josephson junctions. The
effect of disorder and the nature of the superconducting transition in these
Au{0.7}In{0.3} films are discussed.Comment: 8 text pages, 10 figures in one separate PDF file, submitted to PR
Monte Carlo Eikonal Scattering
Monte Carlo evaluation is used to calculate heavy-ion elastic scattering
including the center-of-mass correction and the Coulomb interaction.Angular
distributions are presented for a number of nuclear pairs over a wide energy
range using nucleon-nucleon scattering parameters taken from phase-shift
analyses and densities from independent sources. A technique for the efficient
expansion of the Glauber amplitude in partial waves is developed
Assessing the temporal stability of a measure of trait emotional intelligence: Systematic review and empirical analysis
Determining the temporal stability of a construct is crucial to establishing its validity and utility in real-world scenarios. To-date, few studies have investigated the test-retest reliability of trait emotional intelligence (trait EI), particularly over extended periods of time. The present study presents relevant data from the Trait Emotional Intelligence Questionnaire (TEIQue) over variable intervals, ranging from 30 days (one month) to 1444 days (â four years). Results provide support for trait EI theory, demonstrating strong temporal stability at all levels of the construct (global, factor, and facet). Future research may focus on extending the test-retest intervals at both ends (i.e., below one month and over four years) as well as on comparisons between different trait EI measures
Calibration of Troitsk nu-mass detector readout electronics by signal digital filters
We present the results of tuning and calibration of the detector electronics
in the signal digitization mode. The goal of the experiment is to search for a
possible sterile neutrino signature in tritium beta-decay. The read-out
electronics work in direct oscilloscope mode, which requires to optimize time
frame the with the goal to minimize noise and energy resolution. We use a
7-pixel silicon drift detector (SDD) and a CMOS charge sensitive preamplifier
with very low integration capacitor. Amplifier forms a slowly rising output
shape and operates in pulse-reset mode. The 125 MHz ADC digitizes the signals.
Using calibration data from Fe55 and Am241 gamma sources we check triangular
and trapezoid digital filters to obtain the best noise and energy resolution
performance. We are also examining the option to differentiate the output
signal.Comment: 9 pages, 8 figure
Mechanism of adhesion of glass monomeric cements of Meron and Total-cem to dentin
Recently, researchers note an increase in the prevalence of non-carious lesions of solid dental tissues. The forms of non-carious lesions of teeth are described: erosion and abrasion, wedge-shaped defects and erosion, which were previously practically not met.
Increasing the life expectancy and maintaining natural teeth also led to the fact that clinicians often began to meet with patients with increased erosion of teeth.
Study of the mechanism of adherence of glass-like cements to dentin is very important. In our case, the adhesion of our cements to dentin and enamelabs of acid protrusion, in our opinion, is provided by two mechanisms. The first of these is based on the fact that carboxylate groups of the macromolecules of polyacrylic acid are capable of forming chelating compounds with calcium, in particular calcium hydroxyapatite dentin and enamel.
The second possible mechanism of communication is based on the affinity of polycarboxylic acids to nitrogen of protein molecules, in particular, collagen, which is manifested by the absorption of polyacrylic acid on collagen dentin
The KATRIN Pre-Spectrometer at reduced Filter Energy
The KArlsruhe TRItium Neutrino experiment, KATRIN, will determine the mass of
the electron neutrino with a sensitivity of 0.2 eV (90% C.L.) via a measurement
of the beta-spectrum of gaseous tritium near its endpoint of E_0 =18.57 keV. An
ultra-low background of about b = 10 mHz is among the requirements to reach
this sensitivity. In the KATRIN main beam-line two spectrometers of MAC-E
filter type are used in a tandem configuration. This setup, however, produces a
Penning trap which could lead to increased background. We have performed test
measurements showing that the filter energy of the pre-spectrometer can be
reduced by several keV in order to diminish this trap. These measurements were
analyzed with the help of a complex computer simulation, modeling multiple
electron reflections both from the detector and the photoelectric electron
source used in our test setup.Comment: 22 pages, 12 figure
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