Results of a numerical investigation and estimation of the influence of the length and diameter of a connecting gas pipeline on the working processes and external characteristics of a hybrid piston ...power machine using the oscillations of gas pressure in the injection line are presented.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OBVAL, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
A prototype of a crossheadless hybrid piston power machine is developed based on a basic diagram protected by a patent for an invention. An experimental investigation of the crossheadless machine as ...well as of a crosshead hybrid piston power machines with a smooth, respectively, multistep groove seal is carried out. It is experimentally demonstrated that the surface temperature of the valve plate and the temperature of the intake gas developed by the new crossheadless hybrid piston power machine is, correspondingly, 10–15 K and 6–8 K lower than the comparable temperatures of a crosshead hybrid piston power machine with smooth, respectively, multistep slot seal. Improved cooling of the compressible gas makes it possible to increase the volume efficiency of the compressor section and its indicated efficiency.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OBVAL, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
X-ray diffraction is used to determine the influence of the reduction during cold rolling of wedge steel 20Kh15AN3MD2 samples on the quantitative phase composition, the texture, and the residual ...macrostresses in the α and γ phases. When the reduction increases, the fraction of the γ phase decreases from 82% in the initial hot-rolled state to 74% at a 10% reduction and to 60% when the reduction increases to 70%. The type of austenite texture is characterized by the components typical of the rolling texture of fcc metals, namely, the “brass” texture ({110}〈112〉). It does not change at a 10% reduction, then increases significantly at a 20% reduction, and remains the same up to a 70% reduction. The texture of the α phase is characterized by three components, namely, {110}〈110〉, {211}〈110〉, and {001}〈110〉. The first two components are the transformation textures, which dominate in the initial state; after a reduction of 30%, the third component, which corresponds to the rolling texture of the bcc α phase, increases. The estimation of residual stresses shows that compressive stresses of 600–1100 MPa form in the γ phase and tensile stresses of 1200–1600 MPa form in the α phase.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
The electronic width of the
J
/
ψ
meson and its product by the branching fractions of
J
/
ψ
meson decay to hadrons and electrons measured with the KEDR detector at the VEPP-4M
e
+
e
−
collider have ...been reported in ref. 1.
Measurement of Γee(J/ψ) with KEDR detector Anashin, V. V; Aulchenko, V. M; Baldin, E. M ...
The journal of high energy physics,
05/2018, Volume:
2018, Issue:
5
Journal Article
Peer reviewed
Open access
A
bstract
The product of the electronic width of the
J/ψ
meson and the branching fractions of its decay to hadrons and electrons has been measured using the KEDR detector at the VEPP-4M
e
+
e
−
...collider. The obtained values are
Γ
e
e
J
/
ψ
=
5.550
±
0.056
±
0.089
keV
,
Γ
e
e
J
/
ψ
·
ℬ
hadrons
J
/
ψ
=
4.884
±
0.048
±
0.078
keV
,
Γ
e
e
J
/
ψ
·
ℬ
e
e
J
/
ψ
=
0.3331
±
0.0066
±
0.0040
keV
.
The uncertainties shown are statistical and systematic, respectively. Using the result presented and the world-average value of the electronic branching fraction, one obtains the total width of the
J/ψ
meson:
Γ
=
92.94
±
1.83
keV
.
These results are consistent with the previous experiments.
A time-of-flight detector based on microchannel plates (MCP) is under development. The main goal of this work is the creation of a radiation hard large area detector providing 10 ps time resolution ...in strong magnetic field. The conceptual detector design is described in details.
The Laser Polarimeter is being developed at VEPP-4M collider for beam energy calibration by Resonant Depolarization technique. The essential part of this facility is a photon-tracking detector ...measuring coordinates of backscattered gammas.
A laser polarimeter at the VEPP-4M storage ring is being developed for the beam energy calibration by the resonant depolarization method in the future high-precision measurements of the Υ meson ...masses with the KEDR detector. The status of the laser polarimeter and first energy measurements at 4.1 GeV with an accuracy of 50 keV is described.
The results of a numerical study and assessment of the influence of volumes of receivers and diameters of connecting fluid pipelines on the working processes and external characteristics of the ...studied machine are presented.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OBVAL, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
The structure, principle of operation, and metrological performance of the rubidium atomic fountain developed at VNIIFTRI are presented. The aim of the present work is to assess the preliminary ...uncertainty budget of this standard. The physical effects that cause the largest shifts of the measured frequency, namely, the quadratic Zeeman effect, blackbody radiation effect, gravitational redshift, and cavity pulling effect are considered. The frequency stability of the rubidium fountain is given by σ
y
(τ) = 1.43·10
–13
τ
–1/2
at an evaluated frequency uncertainty of less than 2·10
–16
. Such performances are at the level of the best rubidium fountain standards developed worldwide. These results are relevant for the time and frequency metrology and for timescales.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
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