25 research outputs found
Experimental Investigations of Hydrogen Purification by Purging Through Metal Hydride
In an experimental stand [1] for investigation of properties of hydrogen accumulating the materials investigated
a new type of reactor cleaning and storage of hydrogen.
The applicability of hydrogen purging through metal hydride beds for the purification from nonpoisoning
admixtures is studied experimentally. The main characteristics of the process together with the
main technical barriers of the proposed technology are defined.
Specially designed stainless steel continuous flow reactor filled with LaFe0.1Mn0.3Ni4.8 intermetallic compound
is tested at variable inlet hydrogen/inert gas composition with measuring mass flow, pressure, temperature
and hydrogen content at the outlet both for charging and discharging mode. The estimations of hydrogen
losses and purification capacity show certain advantages of the studied technology in comparison with
PSA-like mode [1], especially from the point of view of operation regime simplification. The evident process
slow-down observed in the experiment is connected with saturation of metal hydride porous bed by hydrogen
and with temperature increase due to high thermal effect at sorption (~ 40 kJ/mole Н2). The ways for heat
and mass transfer optimization together with the range of applicability of the method for fine hydrogen purification
are described and discussed.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3522
Developing New Solid-state Hydrogen Storage and Purification Reactors
New metal hydride hydrogen storage reactors is developed. Automatic diagnostic system capable of measuring the temperature of the porous bed metal hydride, pressure in metal hydride purification reac-tor, gas flow rate on the inlet and outlet of purification modules, the number of components of the gas mix-ture with a gas analyzer.
The estimations of hydrogen losses and purification capacity show certain advantages of the studied technology in comparison with PSA-like mode [1], especially from the point of view of operation regime simplification.
Experimental studies on the charge and discharge reactors RHO - 8 and RHO - 8I with pure hydrogen, to obtain data for verification of mathematical models [1, 2], and determine the effect of the configuration beds absorbing materials on the performance of the reactor.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3560
Measurement of main parameters of the \psi(2S) resonance
A high-precision determination of the main parameters of the \psi(2S)
resonance has been performed with the KEDR detector at the VEPP-4M e^{+}e^{-}
collider in three scans of the \psi(2S) -- \psi(3770) energy range. Fitting the
energy dependence of the multihadron cross section in the vicinity of the
\psi(2S) we obtained the mass value
M = 3686.114 +- 0.007 +- 0.011 ^{+0.002}_{-0.012} MeV and the product of the
electron partial width by the branching fraction into hadrons \Gamma_{ee}*B_{h}
= 2.233 +- 0.015 +- 0.037 +- 0.020 keV.
The third error quoted is an estimate of the model dependence of the result
due to assumptions on the interference effects in the cross section of the
single-photon e^{+}e^{-} annihilation to hadrons explicitly considered in this
work.
Implicitly, the same assumptions were employed to obtain the charmonium
leptonic width and the absolute branching fractions in many experiments.
Using the result presented and the world average values of the electron and
hadron branching fractions, one obtains the electron partial width and the
total width of the \psi(2S):
\Gamma_{ee} =2.282 +- 0.015 +- 0.038 +- 0.021 keV,
\Gamma = 296 +- 2 +- 8 +- 3 keV.
These results are consistent with and more than two times more precise than
any of the previous experiments
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.)
Measurement of \Gamma_{ee}(J/\psi)*Br(J/\psi->e^+e^-) and \Gamma_{ee}(J/\psi)*Br(J/\psi->\mu^+\mu^-)
The products of the electron width of the J/\psi meson and the branching
fraction of its decays to the lepton pairs were measured using data from the
KEDR experiment at the VEPP-4M electron-positron collider. The results are
\Gamma_{ee}(J/\psi)*Br(J/\psi->e^+e^-)=(0.3323\pm0.0064\pm0.0048) keV,
\Gamma_{ee}(J/\psi)*Br(J/\psi->\mu^+\mu^-)=(0.3318\pm0.0052\pm0.0063) keV.
Their combinations
\Gamma_{ee}\times(\Gamma_{ee}+\Gamma_{\mu\mu})/\Gamma=(0.6641\pm0.0082\pm0.0100)
keV,
\Gamma_{ee}/\Gamma_{\mu\mu}=1.002\pm0.021\pm0.013 can be used to improve
theaccuracy of the leptonic and full widths and test leptonic universality.
Assuming e\mu universality and using the world average value of the lepton
branching fraction, we also determine the leptonic \Gamma_{ll}=5.59\pm0.12 keV
and total \Gamma=94.1\pm2.7 keV widths of the J/\psi meson.Comment: 7 pages, 6 figure
New precise determination of the \tau lepton mass at KEDR detector
The status of the experiment on the precise lepton mass measurement
running at the VEPP-4M collider with the KEDR detector is reported. The mass
value is evaluated from the cross section behaviour around the
production threshold. The preliminary result based on 6.7 pb of data is
MeV. Using 0.8 pb of data
collected at the peak the preliminary result is also obtained:
eV.Comment: 6 pages, 8 figures; The 9th International Workshop on Tau-Lepton
Physics, Tau0
New precision measurement of the - and -meson masses
A new high precision measurement of the - and -meson masses
has been performed at the VEPP-4M collider using the KEDR detector. The
resonant depolarization method has been employed for the absolute calibration
of the beam energy. The following mass values have been obtained:
MeV,
MeV.
The relative measurement accuracy has reached for and
for , approximately 3 times better than in the previous
precise experiments.Comment: 12 pages, 4 tables, 10 figure
СТАТИЧЕСКАЯ И УСТАЛОСТНАЯ ПРОЧНОСТЬ АУСТЕНИТНОЙ КОРРОЗИОННОСТОЙКОЙ СТАЛИ С ПОВЫШЕННЫМ СОДЕРЖАНИЕМ АЗОТА
The static and fatigue strength of an austenitic high-strength corrosion-resistant high-nitrogen steel is studied after various types treatment. The mechanisms of fatigue crack nucleation and propagation are considered. Исследована статическая и усталостная прочность аустенитной высокопрочной коррозионностойкой стали с повышенным содержанием азота после различных видов обработки. Рассмотрены механизмы образования и распространения усталостной трещины.