54 research outputs found
Advanced features of NVIDIA Kepler architecture and parallel computation platform CUDA® for developing scientific compute-intensive applications
The paper describes additional features offered by new Kepler architecture of NVIDIA graphic processors, and their usage for creating high performance programs in a wide range of scientific compute-intensive applications. Recommendations are given for their use at realization of sci-tech computation algorithms by means of graphic processors. New capabilities of the parallel computation platform CUDA®; are also described, in particular, regarding a set of program development tool extensions for the Fortran, C and C++ languages. The extended capabilities make it possible to minimize the time of application development and to increase the programming productivity.Описано додаткові можливості, що надаються новою архітектурою графічних процесорів Kepler компанії NVIDIA, і застосування їх для створення високопродуктивних програм широкого спектра обчислювальних наукових застосувань. Надано рекомендації їх використання при реалізації алгоритмів науково-технічних розрахунків засобами графічних процесорів. Приведено опис нових можливостей платформи паралельних обчислень CUDA®, що забезпечують набір розширень засобів розробки програм для мов Fortran, С і С++, направлених на мінімізацію часу розробки додатків і підвищення їх ефективності.Описаны дополнительные возможности, предоставляемые новой архитектурой графических процессоров Kepler компании NVIDIA, и применение их для создания высокопроизводительных программ широкого спектра вычислительных научных приложений. Даны рекомендации по их использованию при реализации алгоритмов научно-технических расчётов средствами графических процессоров. Приведено описание новых возможностей платформы параллельных вычислений CUDA®, обеспечивающих набор расширений средств разработки программ для языков Fortran, С и С++, направленных на минимизацию времени разработки приложений и повышение их эффективности
Using of new possibilities of fermi architecture by development of GPGPU programs
Description of additional functions of hardware and software, which are presented in the structure of new architecture of FERMI graphic processors made by company NVIDIA, was given. Recommendations of their use within the realization of algorithms of scientific and technical calculations by means of the graphic processors were given. Application of the new possibilities of FERMI architecture and CUDA technologies (Compute Unified Device Architecture - unified hardware-software decision for parallel calculations on GPU) of NVIDIA Company was described. It was done for time reduction of applications' development which is using possibilities of GPGPU for acceleration of data processing.Приведено опис додаткових можливостей апаратних i програмних засобiв, що представленi у складi нової архiтектури графiчних процесорiв FERMI компанiї NVIDIA. Дани рекомендацiї їх використан- ня при реалiзацiї алгоритмiв науково-технiчних розрахункiв засобами графiчних процесорiв. Описано застосування нових можливостей архiтектури FERMI i технологiї CUDA компанiї NVIDIA (Compute Unified Device Architecture – унiфiкованого програмно-апаратного рiшення для паралельних обчислень на GPU) для скорочення часу розробки додаткiв, що використовують можливостi GPGPU для прискорення обробки даних.Приведено описание дополнительных возможностей аппаратных и программных средств, представленных в составе новой архитектуры графических процессоров FERMI компании NVIDIA. Даны рекомендации их использования при реализации алгоритмов научно-технических расчётов средствами графических процессоров. Описано применение новых возможностей архитектуры FERMI и технологии CUDA компании NVIDIA (Compute Unified Device Architecture – унифицированного программно-аппаратного решения для параллельных вычислений на GPU) для сокращения времени разработки приложений, использующих возможности GPGPU для ускорения обработки данных
Application of the opportunities of tool system ”CUDA” for graphic processors programming in scientific and technical calculation tasks
The opportunities of technology CUDA (Compute Unified Device Architecture - the unified hardware-software decision
for parallel calculations on GPU)of the company NVIDIA were described. The basic differences of the programming
language ”C” for GPU from ”usual” language ”C” were selected. The examples of CUDA usage for acceleration
of development of applications and realization of algorithms of scientific and technical calculations were given which
are carried out by the means of graphic processors (GPGPU) of accelerators GeForce of the eighth generation. The
recommendations on optimization of the programs using GPU were resulted.Описано можливостi технологiї "CUDA"(Compute Unified Device Architecture – унiфiкованого програмно-
апаратного рiшення для паралельних обчислень на GPU) компанiї NVIDIA. Видiлено основнi вiдмiнностi мови програмування C для GPU вiд "звичайного"С. Дани приклади використання CUDA для
прискорення розробки i реалiзацiї алгоритмiв науково-технiчних розрахункiв, виконуваних засобами
графiчних процесорiв (GPGPU) прискорювачiв GeForce восьмого поколiння. Приведено рекомендацiї
по оптимiзацiї програм, використовуючих GPU.Описаны возможности технологии "CUDA"(Compute Unified Device Architecture – унифицированного программно-аппаратного решения для параллельных вычислений на GPU) компании NVIDIA.
Выделены основные отличия языка программирования C для GPU от "обычного"С. Даны примеры использования CUDA для ускорения разработки приложений и реализации алгоритмов научно-
технических расчётов, выполняемых средствами графических процессоров (GPGPU) ускорителей GeForce
восьмого поколения. Приведены рекомендации по оптимизации программ, использующих GPU
Non-local model of hollow cathode and glow discharge - theory calculations and experiment comparison
General form of the non-local equation for an ionization source in glow
discharge and hollow cathode 3D-simulation is formulated. It is a fundamental
equation in a hollow cathode theory, which allows to make up a complete set of
field equations for a self-consistent problem in a stationary glow discharge
and a hollow cathode. It enables to describe adequately the region of negative
glow and the hollow cathode effect. Here you can see first attempts to compare
calculation results of electrical dependences (pressure - voltage) and
experimental data, - under conditions of gradual appearance of the hollow
cathode effect.Comment: 4 pages, 2 figure
Self-similar factor approximants for evolution equations and boundary-value problems
The method of self-similar factor approximants is shown to be very convenient
for solving different evolution equations and boundary-value problems typical
of physical applications. The method is general and simple, being a
straightforward two-step procedure. First, the solution to an equation is
represented as an asymptotic series in powers of a variable. Second, the series
are summed by means of the self-similar factor approximants. The obtained
expressions provide highly accurate approximate solutions to the considered
equations. In some cases, it is even possible to reconstruct exact solutions
for the whole region of variables, starting from asymptotic series for small
variables. This can become possible even when the solution is a transcendental
function. The method is shown to be more simple and accurate than different
variants of perturbation theory with respect to small parameters, being
applicable even when these parameters are large. The generality and accuracy of
the method are illustrated by a number of evolution equations as well as
boundary value problems.Comment: Latex file, 27 pages, 2 figures, 5 table
Recording the high efficient diffraction gratings by using He-Cd laser
High efficient holographic diffraction gratings with spatial frequencies from 600 to 3600 mm⁻¹ have been recorded using As₄₀S₆₀–хSeх (х = 0, 10, 20) photoresist layers and He-Cd laser operating at the wavelength λ = 440 nm. The investigation of the grating relief made by atomic force microscopy revealed that As₄₀S₆₀–хSeх resists allows one to record grating originals with profiles of various heights depending on the resist chemical composition, its etching and exposure times. We obtained typical spectral and angular dependences of the first order diffraction efficiency for the grating with the high modulation depth and groove profile close to the sinusoidal one. Comparing the recorded gratings with different spatial frequencies, exposure and etching times, we determined optimal recording conditions (exposure and etching times) in order to obtain gratings with the high diffraction efficiency
Study of operating modes of STRAUS-R accelerator
The description of a pulsed electron accelerator STRAUS-R (3.5 MeV, 60 kA, 60 ns) and results of its experimental
research for two operation modes are given. In the mode of electron beam focusing the accelerator provides the focal spot of 3-4 mm diameter on a target and maximum exposure dose of 27 R at 1-m distance from the output window. In the irradiating mode the maximum dose achieves 36 R at 1-m distance from the target with inhomogeneity ≤ 30% within the area 0.36 m² (irradiation spot diameter is 0.6 m).Приведены описание и результаты исследований импульсного электронного ускорителя СТРАУС-Р (3,5 МэВ, 60 кА, 60 нс) в двух режимах его работы. В режиме фокусировки электронного пучка ускоритель обеспечивает получение на мишени фокусного пятна диаметром 3…4 мм при максимальной дозе тормозного излучения 27 Р на расстоянии 1 м от выходного фланца. В облучательном режиме максимальная доза тормозного излучения на расстоянии 1 м от мишени по оси ускорителя достигает 36 Р с неоднородностью ≤ 30% на площади 0,36 м² (диаметр пятна облучения 0,6 м).Наведено опис і результати досліджень імпульсного електронного прискорювача СТРАУС-Р (3,5 МеВ, 60 кА, 60 нс) у двох режимах його роботи. У режимі фокусування електронного пучка прискорювач забезпечує одержання на мішені фокусної плями діаметром 3...4 мм при максимальній дозі гальмівного випромінювання 27 Р на відстані 1 м від вихідного фланця. При опроміненні максимальна доза гальмового випромінювання на відстані 1 м від мішені по осі прискорювача досягає 36 Р с неоднорідністю ≤ 30% на площі 0,36 м² (діаметр плями опромінення 0,6 м)
Measurement of and between 3.12 and 3.72 GeV at the KEDR detector
Using the KEDR detector at the VEPP-4M collider, we have measured
the values of and at seven points of the center-of-mass
energy between 3.12 and 3.72 GeV. The total achieved accuracy is about or
better than at most of energy points with a systematic uncertainty of
about . At the moment it is the most accurate measurement of in
this energy range
Search for narrow resonances in e+ e- annihilation between 1.85 and 3.1 GeV with the KEDR Detector
We report results of a search for narrow resonances in e+ e- annihilation at
center-of-mass energies between 1.85 and 3.1 GeV performed with the KEDR
detector at the VEPP-4M e+ e- collider. The upper limit on the leptonic width
of a narrow resonance Gamma(R -> ee) Br(R -> hadr) < 120 eV has been obtained
(at 90 % C.L.)
Scintillating bolometers based on ZnMoO4 and Zn100MoO4 crystals to search for 0ν2β decay of 100Mo (LUMINEU project): first tests at the Modane Underground Laboratory
The technology of scintillating bolometers based on zinc molybdate (ZnMoO4) crystals is under development within the LUMINEU project to search for decay of 100Mo with the goal to set the basis for large scale experiments capable to explore the inverted hierarchy region of the neutrino mass pattern. Advanced ZnMoO4 crystal scintillators with mass of ∼0.3 kg were developed and Zn100MoO4 crystal from enriched 100Mo was produced for the first time by using the low-thermal-gradient Czochralski technique. One ZnMoO4 scintillator and two samples (59 g and 63 g) cut from the enriched boule were tested aboveground at milli-Kelvin temperature as scintillating bolometers showing a high detection performance. The first results of the low background measurements with three ZnMoO4 and two enriched detectors installed in the EDELWEISS set-up at the Modane Underground Laboratory (France) are presented
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