132 research outputs found
Conversion and Validation of SIGART Program, a Progressive Traffic Signal Lights System Computer Model
The purpose of this research paper was to translate a Computer Model (SIGART), capable of simulating a progressive traffic signal lights system, from Burroughs B5500 FORTRAN II to the IBM 360 FORTRAN IV computer language, to outline the program algorithm, to set up detailed program documentation and to validate this model by applying practical system data. Expansion of the SIGART program by addition of an option to produce a time space plot of the output data utilizing a Calcomp plotter was also to be considered
ЭФФЕКТЫ ПЕРЕКЛЮЧЕНИЯ И ПАМЯТИ В ТОНКОПЛЕНОЧНЫХ НЕУПОРЯДОЧЕННЫХ ХАЛЬКОГЕНИДНЫХ ПОЛУПРОВОДНИКАХ
The possibility of creation of thin film memory elements and threshold switching elements on the base of one chalcogenide - tellurium is analyzed in the proposed article.В предлагаемой статье анализируется возможность создания тонкопленочных элементов памяти и порогового переключения на основе одного халькогена-теллура
On nature of the scalar-isoscalar mesons in the uniformizing-variable method based on analyticity and unitarity
The experimental data on the processes
in the
channel have been jointly analyzed to study the status
and nature of the . The method of analysis is based on analyticity and
unitarity and uses an uniformization procedure. Some spectroscopic implications
from results of the analysis are discussed.Comment: 18 pages, 5 figures, 9 table
Correlation effects during liquid infiltration into hydrophobic nanoporous mediums
Correlation effects arising during liquid infiltration into hydrophobic
porous medium are considered. On the basis of these effects a mechanism of
energy absorption at filling porous medium by nonwetting liquid is suggested.
In accordance with this mechanism, the absorption of mechanical energy is a
result expenditure of energy for the formation of menisci in the pores on the
shell of the infinite cluster and expenditure of energy for the formation of
liquid-porous medium interface in the pores belonging to the infinite cluster
of filled pores. It was found that in dependences on the porosity and,
consequently, in dependences on the number of filled pores neighbors, the
thermal effect of filling can be either positive or negative and the cycle of
infiltration-defiltration can be closed with full outflow of liquid. It can
occur under certain relation between percolation properties of porous medium
and the energy characteristics of the liquid-porous medium interface and the
liquid-gas interface. It is shown that a consecutive account of these
correlation effects and percolation properties of the pores space during
infiltration allow to describe all experimental data under discussion
Off-shell scattering amplitudes in the double-logarithmic approximation
When scattering amplitudes are calculated in the double-logarithmic
approximation, it is possible to relate the double-logarithmic on-shell and
off-shell amplitudes. Explicit relations are obtained for scattering amplitudes
in QED, QCD, and the ElectroWeak Standard Model. The off-shell amplitudes are
considered in the hard and the Regge kinematic limits. We compare our results
in both the Feynman and Coulomb gauges.Comment: 15 pages, 3 figures; RevTeX
Non-Fermi-Liquid Behavior of Superconducting SnH
We studied chemical interaction of Sn with H by X-ray diffraction methods
at pressures of 180-210 GPa. A previously unknown tetrahydride SnH with a
cubic structure () exhibiting superconducting properties below
= 72 K was obtained; the formation of a high molecular -SnH
superhydride and several lower hydrides, SnH and
-SnH, was also detected. The temperature dependence of
critical current density (T) in SnH yields the superconducting gap
2(0) = 20-22 meV at 180 GPa. The SnH superconductor has unusual
behavior in strong magnetic fields: linear temperature dependences of
magnetoresistance and the upper critical magnetic field (T)
( - ). The latter contradicts the
Wertheimer-Helfand-Hohenberg model developed for conventional superconductors.
Along with this, the temperature dependence of electrical resistance of
SnH in normal resistivity state exhibits a deviation from what is expected
for phonon-mediated scattering described by the Bloch-Gr\"uneisen model, and is
beyond the framework of the Fermi liquid theory. Such anomalies occur for many
superhydrides, making them much closer to cuprates than previously believed
Puzzles of Dark Matter - More Light on Dark Atoms?
Positive results of dark matter searches in experiments DAMA/NaI and
DAMA/LIBRA confronted with results of other groups can imply nontrivial
particle physics solutions for cosmological dark matter. Stable particles with
charge -2, bound with primordial helium in O-helium "atoms" (OHe), represent a
specific nuclear-interacting form of dark matter. Slowed down in the
terrestrial matter, OHe is elusive for direct methods of underground Dark
matter detection using its nuclear recoil. However, low energy binding of OHe
with sodium nuclei can lead to annual variations of energy release from OHe
radiative capture in the interval of energy 2-4 keV in DAMA/NaI and DAMA/LIBRA
experiments. At nuclear parameters, reproducing DAMA results, the energy
release predicted for detectors with chemical content other than NaI differ in
the most cases from the one in DAMA detector. Moreover there is no bound
systems of OHe with light and heavy nuclei, so that there is no radiative
capture of OHe in detectors with xenon or helium content. Due to dipole Coulomb
barrier, transitions to more energetic levels of Na+OHe system with much higher
energy release are suppressed in the correspondence with the results of DAMA
experiments. The proposed explanation inevitably leads to prediction of
abundance of anomalous Na, corresponding to the signal, observed by DAMA.Comment: Contribution to Proceedings of XIII Bled Workshop "What Comes beyond
the Standard Model?
The High-Acceptance Dielectron Spectrometer HADES
HADES is a versatile magnetic spectrometer aimed at studying dielectron
production in pion, proton and heavy-ion induced collisions. Its main features
include a ring imaging gas Cherenkov detector for electron-hadron
discrimination, a tracking system consisting of a set of 6 superconducting
coils producing a toroidal field and drift chambers and a multiplicity and
electron trigger array for additional electron-hadron discrimination and event
characterization. A two-stage trigger system enhances events containing
electrons. The physics program is focused on the investigation of hadron
properties in nuclei and in the hot and dense hadronic matter. The detector
system is characterized by an 85% azimuthal coverage over a polar angle
interval from 18 to 85 degree, a single electron efficiency of 50% and a vector
meson mass resolution of 2.5%. Identification of pions, kaons and protons is
achieved combining time-of-flight and energy loss measurements over a large
momentum range. This paper describes the main features and the performance of
the detector system
Superconductivity at 36 K in beta-Fe1.01Se with the compression of the interlayer separation under pressure
In this letter, we report that the superconductivity transition temperature
in beta-Fe1.01Se increases from 8.5 to 36.7 K under applied pressure of 8.9
GPa. It then decreases at higher pressure. A dramatic change in volume is
observed at the same time Tc rises, due to a collapse of the separation between
the Fe2Se2 layers. A clear transition to a linear resistivity normal state is
seen on cooling at all pressures. No static magnetic ordering is observed for
the whole p-T phase diagram. We also report that at higher pressure (starting
around 7 GPa and completed at 38 GPa), Fe1.01Se transforms to a hexagonal
NiAs-type structure and displays non-magnetic, insulating behavior. The
inclusion of electron correlation in band structure caculations is necessary to
describe this behavior, signifying that such correlations are important in this
chemical system. Our results strongly support unconventional superconductivity
in beta-Fe1.01Se.Comment: 17 pages, 4 figure
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