178 research outputs found
ОСОБЕННОСТИ ПРИМЕНЕНИЯ БАЛЛИСТИЧЕСКОГО ЖЕЛАТИНА КАК ИМИТАТОРА БИОЛОГИЧЕСКИХ ТКАНЕЙ ЧЕЛОВЕКА
The study of a mechanism of gunshot wound formation is the main task of wound ballistics. The damaging effect of the wounding projectile (the regularities in the formation of a temporary pulsating cavity) can be studied the most effectively as part of an experiment on simulators whose physical properties (density, elasticity, the capacity to absorb energy) resemble the tissues of a living human. The article presents modern capacities of applying ballistic gel as the most representative biological simulator of a living human s tissues. The article suggests priority methods ofmaking blocks of gel, the conditions of conducting the experiment and mathematic processing of data from the perspective wounding ballistics. Due to the elastic properties of gel, the temporary pulsating cavity that emerges in the course of the wounding projectile in the same way as the living tissues collapse with the permanent wound tract. In order to evaluate the volume of the damaging effect of the wounding projectile there are used standard calculation methods: the fissure surface area (FSA), wound profile method (WPM), the total crack length method (TCL).Представлено сучасні можливості застосування балістичного желатину як біологічного імітатора, який найбільш репрезентативний щодо тканин живої людини. Запропоновано пріоритетні методики виготовлення блоків желатину, умови проведення експерименту та способи математичного оброблення даних із позиції ранової балістики
Spectroscopy of Helium Isotope 6He
The excited states of heavy helium isotope 6He were studied in stopped pion absorption in the reactions 9Be
Transport Equations from Liouville Equations for Fractional Systems
We consider dynamical systems that are described by fractional power of
coordinates and momenta. The fractional powers can be considered as a
convenient way to describe systems in the fractional dimension space. For the
usual space the fractional systems are non-Hamiltonian. Generalized transport
equation is derived from Liouville and Bogoliubov equations for fractional
systems. Fractional generalization of average values and reduced distribution
functions are defined. Hydrodynamic equations for fractional systems are
derived from the generalized transport equation.Comment: 11 pages, LaTe
Fractional Liouville and BBGKI Equations
We consider the fractional generalizations of Liouville equation. The
normalization condition, phase volume, and average values are generalized for
fractional case.The interpretation of fractional analog of phase space as a
space with fractal dimension and as a space with fractional measure are
discussed. The fractional analogs of the Hamiltonian systems are considered as
a special class of non-Hamiltonian systems. The fractional generalization of
the reduced distribution functions are suggested. The fractional analogs of the
BBGKI equations are derived from the fractional Liouville equation.Comment: 20 page
Fractional Systems and Fractional Bogoliubov Hierarchy Equations
We consider the fractional generalizations of the phase volume, volume
element and Poisson brackets. These generalizations lead us to the fractional
analog of the phase space. We consider systems on this fractional phase space
and fractional analogs of the Hamilton equations. The fractional generalization
of the average value is suggested. The fractional analogs of the Bogoliubov
hierarchy equations are derived from the fractional Liouville equation. We
define the fractional reduced distribution functions. The fractional analog of
the Vlasov equation and the Debye radius are considered.Comment: 12 page
The Heidelberg-Moscow double beta decay experiment with enriched 76Ge. First results
Abstract The status of the Heidelberg-Moscow ββ-experiment using isotopically enriched 76Ge is reported. The results of 14.8 mol yr (or 1.29 kg yr) of operation are presented. From these data a new half life time for the ββ0v-decay of 76Ge to the ground state of 76Se of T 1 2 1.4 (2.5) X 10 24 yr with 90% (68%) CL can be deduced. For a possible neutrinoless decay to the first excited state a half life of 4.3(8.2)X1023 yr can be excluded with 90% (68%) CL
Searching for dark matter with the enriched Ge detectors of the Heidelberg-Moscow ββ experiment
Abstract For the first time a search for dark matter with isotopically enriched material is done, by using the Ge detectors of the Heidelberg-Moscow experiment. A measuring time of 165.6 kg·d is used to set limits on the spin-independent cross section of weakly interacting massive particles (WIMPs). A background level of 0.102±0.005 events/(kg·d·keV) was achieved (average value between 11 keV and 30 keV). It was possible to extend the exclusion range for Dirac neutrino masses up to 4.7 TeV
Sound Control-Flow Graph Extraction for Java Programs with Exceptions
We present an algorithm to extract control-flow graphs from Java bytecode, considering exceptional flows. We then establish its correctness: the behavior of the extracted graphs is shown to be a sound over-approximation of the behavior of the original programs. Thus, any temporal safety property that holds for the extracted control-flow graph also holds for the original program. This makes the extracted graphs suitable for performing various static analyses, in particular model checking. The extraction proceeds in two phases. First, we translate Java bytecode into BIR, a stack-less intermediate representation. The BIR transformation is developed as a module of Sawja, a novel static analysis framework for Java bytecode. Besides Sawja’s efficiency, the resulting intermediate representation is more compact than the original bytecode and provides an explicit representation of exceptions. These features make BIR a natural starting point for sound control-flow graph extraction. Next, we formally define the transformation from BIR to control-flow graphs, which (among other features) considers the propagation of uncaught exceptions within method calls. We prove the correctness of the two-phase extraction by suitably combining the properties of the two transformations with those of an idealized control-flow graph extraction algorithm, whose correctness has been proved directly. The control-flow graph extraction algorithm is implemented in the \textsc{ConFlEx} tool. A number of test-cases show the efficiency and the utility of the implementation
The Large Enriched Germanium Experiment for Neutrinoless Double Beta Decay (LEGEND)
The observation of neutrinoless double-beta decay (0)
would show that lepton number is violated, reveal that neutrinos are Majorana
particles, and provide information on neutrino mass. A discovery-capable
experiment covering the inverted ordering region, with effective Majorana
neutrino masses of 15 - 50 meV, will require a tonne-scale experiment with
excellent energy resolution and extremely low backgrounds, at the level of
0.1 count /(FWHMtyr) in the region of the signal. The
current generation Ge experiments GERDA and the MAJORANA DEMONSTRATOR
utilizing high purity Germanium detectors with an intrinsic energy resolution
of 0.12%, have achieved the lowest backgrounds by over an order of magnitude in
the 0 signal region of all 0
experiments. Building on this success, the LEGEND collaboration has been formed
to pursue a tonne-scale Ge experiment. The collaboration aims to develop
a phased 0 experimental program with discovery potential
at a half-life approaching or at years, using existing resources as
appropriate to expedite physics results.Comment: Proceedings of the MEDEX'17 meeting (Prague, May 29 - June 2, 2017
Measurement of the ββ2ν decay of 76Ge
Abstract From the data taken with one of the enriched detectors of the Heidelberg-Moscow ββ experiment a half-life of T 1 2 2v = (1.42 ± 0.03 ( stat ) ± 0.13 ( syst )) × 10 12 yr for the two-neutrino double-beta ( ββ 2 ν ) decay of 76 Ge is derived. The 76 Ge exposure is 19.3 mol yr. This result represents the first high statistics measurement and probably the first undoubtable evidence of this extremely rare nuclear decay mode. The measured decay rate is in good agreement with the theoretical predictions
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