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Search Results: 1 - 10 of 130403 matches for " V. Muratova "
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Search for neutrino oscillations at a research reactor
A. V. Derbin,A. S. Kayunov,V. N. Muratova
Physics , 2012,
Abstract: A project of search for oscillations of reactor neutrinos on a short, 5 - 15 meters, baseline with liquid scintillation position-sensitive detector POSEIDON is described. The oscillations of the electron antineutrinos into sterile neutrinos will be searched at 100 MW research reactor with the size of the active zone of about 0.5 m. The values of the oscillation parameters available for research are in the region $\delta m^2 = (0.3 - 6) \rm{eV}^2$ and $\rm{Sin}^2(2\theta)\geq 0.01$.
Search for Solar Axions Produced in the $p + d \rightarrow\rm{^3He}+ A$ Reaction
A. V. Derbin,A. S. Kayunov,V. N. Muratova
Physics , 2010, DOI: 10.3103/S106287381006016X
Abstract: A search for the axioelectric absorption of 5.5-MeV solar axions produced in the $p+d\rightarrow \rm{^3He}+\gamma(5.5 \rm{MeV})$ reaction was performed with two BGO detectors placed inside a low-background setup. A model independent limit on axion-photon and axion-nucleon couplings was obtained: $|g_{Ae}\times g_{AN}| \leq 3.2\times 10^{-9} (m_A=0)$. Constraints on the axion-electron coupling constant were obtained for axions with masses in the $(0.1-1.0)$ MeV range: $g_{Ae}\leq (1.8-9.0)\times 10^{-7}$. The solar positron flux from $A\rightarrow e^-+e^+$ decay was determined for axions with masses $m_A > 2m_e$. Using the existing experimental data on the interplanetary positron flux, a new constraint on the axion-electron coupling constant for axions with masses in the $(1.2-5.4)$ MeV range was obtained: $g_{Ae} \leq (1-5)\times 10^{-17}$.
Search for axioelectric effect of 5.5 MeV solar axions using BGO detectors
A. V. Derbin,S. V. Bakhlanov,I. S. Dratchnev,A. S. Kayunov,V. N. Muratova
Physics , 2013, DOI: 10.1140/epjc/s10052-013-2490-y
Abstract: A search for axioelectric absorption of solar axions produced in the $ p + d \rightarrow {^3\rm{He}}+\gamma (5.5 \rm{MeV})$ reactions has been performed with a BGO detector placed in a low-background setup. A model-independent limit on an axion-nucleon and axion-electron coupling constant has been obtained: $| g_{Ae}\times g_{AN}^3|< 2.9\times 10^{-9}$ for 90% confidence level. The constrains of the axion-electron coupling have been obtained for hadronic axion with masses in (0.1 - 1) MeV range: $|g_{Ae}| \leq (1.4 - 9.7)\times 10^{-7}$.
Constraints on the axion-electron coupling for solar axions produced by Compton process and bremsstrahlung
A. V. Derbin,A. S. Kayunov,V. N. Muratova,D. A. Semenov,E. V. Unzhakov
Physics , 2011, DOI: 10.1103/PhysRevD.83.023505
Abstract: The search for solar axions produced by Compton ($\gamma+e^-\rightarrow e^-+A$) and bremsstrahlung-like ($e^-+Z \rightarrow Z+e^-+A$) processes has been performed. The axion flux in the both cases depends on the axion-electron coupling constant. The resonant excitation of low-lying nuclear level of $^{169}\rm{Tm}$ was looked for: $A+^{169}$Tm $\rightarrow ^{169}$Tm$^*$ $\rightarrow ^{169}$Tm $+ \gamma$ (8.41 keV). The Si(Li) detector and $^{169}$Tm target installed inside the low-background setup were used to detect 8.41 keV $\gamma$-rays. As a result, a new model independent restriction on the axion-electron and the axion-nucleon couplings was obtained: $g_{Ae}\times|g^0_{AN}+ g^3_{AN}|\leq 2.1\times10^{-14}$. In model of hadronic axion this restriction corresponds to the upper limit on the axion-electron coupling and on the axion mass $g_{Ae}\times m_A\leq3.1\times10^{-7}$ eV (90% c.l.). The limits on axion mass are $m_A\leq$ 105 eV and $m_A\leq$ 1.3 keV for DFSZ- and KSVZ-axion models, correspondingly (90% c.l.).
Search for solar axions produced by Compton process and bremsstrahlung using axioelectric effect
A. V. Derbin,I. S. Drachnev,A. S. Kayunov,V. N. Muratova
Physics , 2012, DOI: 10.1134/S002136401207003X
Abstract: The axio-electric effect in silicon atoms is sought for solar axions appearing owing to bremsstrahlung and the Compton process. Axions are detected using a Si(Li) detector placed in a low-background setup. As a result, a model-independent constraint on the axion-electron coupling constant $|g_{Ae}| \leq 2.2\times 10^{-10}$ has been obtained, which leads to the bounds $m_{A}\leq$ 7.9 eV and $m_{A}\leq$ 1.4 keV for the mass of the axion in the DFSZ and KSVZ models, respectively (90% C.L.).
Transmission-blocking activity induced by malaria vaccine candidates Pfs25/Pvs25 is a direct and predictable function of antibody titer
Kazutoyo Miura, David B Keister, Olga V Muratova, Jetsumon Sattabongkot, Carole A Long, Allan Saul
Malaria Journal , 2007, DOI: 10.1186/1475-2875-6-107
Abstract: Rabbit anti-Pfs25 sera and monkey anti-Pvs25 sera were generated and the antibody titers were determined by a standardized ELISA. The biological activity of the same sera was tested by MFA using Plasmodium gametocytes (cultured Plasmodium falciparum or Plasmodium vivax from malaria patients) and Anopheles mosquitoes.Anti-Pfs25 and anti-Pvs25 sera showed that ELISA antibody units correlate with the percent reduction in the oocyst density per mosquito (Spearman Rank correlations: 0.934 and 0.616, respectively), and fit a hyperbolic curve when percent reduction in oocyst density is plotted against antibody units of the tested sample. Antibody levels also correlated with the number of mosquitoes that failed to become infected, and this proportion can be calculated from the reduction in oocyst numbers and the distribution of oocysts per infected mosquito in control group.ELISA data may be used as a surrogate for the MFA to evaluate transmission-blocking vaccine efficacy. This will facilitate the evaluation of transmission-blocking vaccines and implementation of this malaria control strategy.The World Health Organization estimates that malaria causes 300–500 million clinical cases and 1 million deaths each year worldwide. Parasite strains that are resistant to anti-malarial drugs and mosquito vectors resistant to insecticides have emerged, enhancing the need for effective vaccines [1,2]. While multiple stages of the parasite life cycle are being targeted for vaccine development, vaccines against mosquito stage antigens are among the most novel. These mosquito-stage transmission-blocking (MSTB) vaccines are designed to prevent successful parasite infection of the mosquito vector and consequently prevent further parasite spread among humans [3].In areas of low malaria transmission, MSTB vaccines, as a component of an integrated programme, may locally eliminate malaria transmission. Even in areas of high transmission the entomological inoculation rates (EIR) correlates with
Search for Resonant Absorption of Solar Axions Emitted in M1 Transition in $^{57}$Fe Nuclei
A. V. Derbin,A. I. Egorov,I. A. Mitropol'sky,V. N. Muratova,D. A. Semenov,E. V. Unzhakov
Physics , 2009, DOI: 10.1140/epjc/s10052-009-1095-y
Abstract: A search for resonant absorbtion of 14.4 keV solar axions by $^{57}$Fe target was performed. The Si(Li) detector placed inside the low-background setup was used to detect the $\gamma$-quanta appearing in the deexcitation of 14.4 keV nuclear level: $A+\rm{^{57}Fe} \to \rm{^{57}Fe^{*}} \to \rm{^{57}Fe} + \gamma$. The new upper limit for the hadronic axion mass have been obtained: $m_{A} \leq 151$ eV (90% C.L.) ($S$=0.5, $z$=0.56).
Search for solar axions produced by Compton process and bremsstrahlung using the resonant absorption and axioelectric effect
A. V. Derbin,I. S. Dratchnev,A. S. Kayunov,V. N. Muratova,D. A. Semenov,E. V. Unzhakov
Physics , 2013,
Abstract: The search for resonant absorption of Compton and bremsstrahlung solar axions by $^{169}$Tm nuclei have been performed. Such an absorption should lead to the excitation of low-lying nuclear energy level: $A+^{169}$Tm $\rightarrow ^{169}$Tm$^*$ $\rightarrow ^{169}$Tm $+ \gamma$ (8.41 keV). Additionally the axio-electric effect in silicon atoms is sought. The axions are detected using a Si(Li) detectors placed in a low-background setup. As a result, a new model independent restrictions on the axion-electron and the axion-nucleon coupling: $g_{Ae}\times|g^0_{AN}+ g^3_{AN}|\leq 2.1\times10^{-14}$ and the axion-electron coupling constant: $|g_{Ae}| \leq 2.2\times 10^{-10}$ has been obtained. The limits leads to the bounds $m_{A}\leq$ 7.9 eV and $m_{A}\leq$ 1.3 keV for the mass of the axion in the DFSZ and KSVZ models, respectively ($90\%$ C.L.).
Search for Solar Axions Produced by Primakoff Conversion Using Resonant Absorption by $^{169}$Tm Nuclei
A. V. Derbin,S. V. Bakhlanov,A. I. Egorov,I. A. Mitropolsky,V. N. Muratova,D. A. Semenov,E. V. Unzhakov
Physics , 2009, DOI: 10.1016/j.physletb.2009.06.016
Abstract: The search for resonant absorption of the Primakoff solar axions by $^{169}$Tm nuclei have been performed. Such an absorption should lead to the excitation of low-lying nuclear energy level: $A+^{169}$Tm $\to ^{169}$Tm$^*$ $\to ^{169}$Tm$ + \gamma$ (8.41 keV). The Si(Li) detector and $^{169}$Tm target placed inside the low-background setup were used for that purpose. As a result, a new restriction on the axion-photon coupling and axion mass was obtained: $g_{A\gamma}({GeV}^{-1})\cdot m_A(eV)\leq1.36\cdot10^{-5}$ (90% c.l.). In model of hadronic axion this restriction corresponds to the upper limit on axion mass - $m_A\leq$ 191 eV for 90% c.l.
Dynamics of plasma hemostasis in women with thrombogenic pregnancy and delivery complications
Bondar Т.P.,Muratova A.Y.,Tsaturyan Е.О.
Saratov Journal of Medical Scientific Research , 2012,
Abstract: Purpose: to study the dynamics of plasma hemostasis in women with uncomplicated pregnancies and with the manifestations of thrombophilia in the III trimester of pregnancy to the onset of delivery and the postpartum period. Materials and methods. Study of plasma parameters of hemostasis has been performed in 408 women. The surveyed patients have been divided into groups: A — Women with no abnormalities of hemostasis (n=152), В —Women with symptomatic thrombophilia (n=256). The women have been examined for the first time in the III trimester of pregnancy 38-39 weeks' gestation, 3 hours after birth and on the fifth day. Results. Women with thrombophilia have suffered significant changes in coagulation potential, characterized by hypercoagulability, thrombinemia and reduced reserve of natural anticoagulants, as well as decreased activity of fibrinolysis. The changes observed in the prenatal period, have intensified on the first days after birth. Conclusion. The indices can be used for control the risk of thrombogenic complications, rationale for therapy.
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