Expected Sensitivity to Galactic/Solar Axions and Bosonic Super-WIMPs based on the Axio-electric Effect in Liquid Xenon Dark Matter Detectors

We present systematic case studies to investigate the sensitivity of axion searches by liquid xenon detectors, using the axio-electric effect (analogue of the photoelectric effect) on xenon atoms. Liquid xenon is widely considered to be one of the best target media for detection of WIMPs (Weakly Interacting Massive Particles which may form the galactic dark matter) using nuclear recoils. Since these detectors also provide an extremely low radioactivity environment for electron recoils, very weakly-interacting low-mass particles (< 100 keV/c^2), such as the hypothetical axion, could be detected as well - in this case using the axio-electric effect. Future ton-scale liquid Xe detectors will be limited in sensitivity only by irreducible neutrino background (pp-chain solar neutrino and the double beta decay of 136Xe) in the mass range between 1 and 100 keV/c^2. Assuming one ton-year of exposure, galactic axions (as non-relativistic dark matter) could be detected if the axio-electric coupling g_Ae is greater than 10^-14 at 1 keV/c^2 (or $10^-13 at 100 keV/c^2). Below a few keV/c^2, and independent of the mass, a solar axion search would be sensitive to a coupling g_Ae ~ 10^-12. This limit will set a stringent upper bound on axion mass for the DFSV and KSVZ models for the mass ranges m_A < 0.1 eV/c^2 and < 10 eV/c^2, respectively. Vector-boson dark matter could also be detected for a coupling constant alpha'/alpha > 10^-33 (for mass 1 keV/c^2) or > 10^-27 (for mass 100 keV/c^2).Comment: 17 pages, 10 figure

36 Months Survivability And Its Predictors In Patients With Chronic Heart Failure And Decreased Fraction Of Left Ventricular Ejection Depending On Sex

Aim of the work: to compare survivability parameters during 36 months and their predictors among men and women with chronic heart failure and decreased fraction of left ventricular ejection.Materials and methods: the research included 356 patients with CHF (NYHA ІІ –ІV) with decreased LVEF&lt;40 %, 18–75 years old. Using Kaplan-Meier method, there was analyzed the survivability in men and women during 36 months, then there were analyzed independent factors that influenced survivability terms depending on sex using the multiple logistic regression.Results. Our analysis of the survivability of patients with CHF with decreased LVEF demonstrated that the cumulative survival after 3 years of observation was 49 and 51 % for men and women, respectively. The curves of 36 months survivability didn\u27t reliably differ. At the analysis of factors, associated with the bad prognosis, there were observed differences between groups of men and women with CHF. Thus, in men the predictors of 36 month survival were: the thickness of the right ventricle wall, size of the right atrium, end-diastolic volume and end-systolic volume of LV, indices of EDV and ESV of LV, urinary acid level, value of LVEF. In women the predictors of survivability during 3 years were the following parameters: BMI, DM type 2 in an anamnesis, end-diastolic size of LV, end-systolic size of LV, blood glucose level, LVEF.Conclusion. The survivability of men and women with CHF with decreased LVEF during 36 months didn\u27t reliably differ and was 49 and 51 % respectively. But predictors of the lethal outcome in men and women essentially differed during 36 months, and their number is essentially higher in men

Динаміка електричної активності головного мозку при активації сенсорного апарата швколових каналів

For an estimation of dynamics of electrical activity of human brain the EEG record was carried out in a background régime (conducted at closed eyes of inspected persons) and at superposition of afferent irritant agents by the way of stimulations of semicircular channels and light stimulation (eye discovering). The relation between amplitude and frequency of cérébral rhythms in condition of relative physiological rest and at boring of vestibular and Visual receptors was revealedДля оцінки динаміки електричної активності головного мозку проводився запис ЕЕГ у фоновому режимі (при закритих очах обстежуваних) і при пред'явленні аферентних подразників у виді стимуляції півколових каналів і світлової стимуляції (відкриття очей). Виявлено залежність між амплітудою і частотою мозкових ритмів у стані відносного фізіологічного спокою та при подразненні вестибулярних і зорових рецепторівДля оцінки динаміки електричної активності головного мозку проводився запис ЕЕГ у фоновому режимі (при закритих очах обстежуваних) і при пред'явленні аферентних подразників у виді стимуляції півколових каналів і світлової стимуляції (відкриття очей). Виявлено залежність між амплітудою і частотою мозкових ритмів у стані відносного фізіологічного спокою та при подразненні вестибулярних і зорових рецепторі

A Comparative Numerical Study on GEM, MHSP and MSGC

In this work, we have tried to develop a detailed understanding of the physical processes occurring in those variants of Micro Pattern Gas Detectors (MPGDs) that share micro hole and micro strip geometry, like GEM, MHSP and MSGC etc. Some of the important and fundamental characteristics of these detectors such as gain, transparency, efficiency and their operational dependence on different device parameters have been estimated following detailed numerical simulation of the detector dynamics. We have used a relatively new simulation framework developed especially for the MPGDs that combines packages such as GARFIELD, neBEM, MAGBOLTZ and HEED. The results compare closely with the available experimental data. This suggests the efficacy of the framework to model the intricacies of these micro-structured detectors in addition to providing insight into their inherent complex dynamical processes

changes of rats electrohippocampogram and their behavioral responses caused by amplification of brain GABA-ergic mechanisms during prolonged stress

The changes of waves’ power and spectral composition of electrohippocampogram (EHpG) were analyzed in rats which brain GABA-ergic mechanisms increased by gidazepam and pyracetam during prolonged stress comparatively to the indices of EHpG under isolated affective influence. The nature of two-phase dynamics of the changes could indicate an adaptogenic action of drugs. It’s shown that modulation of central processes during prolonged stress and amplification of brain GABA-ergic mechanisms are accompanied by the changes of the animals’ behavioral reactions

Influence of the right-handed and left-hand vortex pulsed magnetic fields on bioelectric activity of ante-rior and posterior zones of hypothalamus under stress simulation

Досліджено динаміку основних ритмів гіпоталамограми за умов стресу та дії вихрового ім пульсного магнітного поля правого та лівого обертання. Виявлено неоднозначний вплив як на різну активність, так і в різних зонах гіпоталамуса, що може бути обумовлено як специфічністю дії передньої та задньої зон гіпоталамуса у період стрес-реакції, так і механізмом генерації окремих хвиль.Исследована динамика основных ритмов гипоталамограмы в условиях стресса и действия вихревого им пульсной магнитного поля правого и левого вращения. Выявлено неоднозначное влияние как на различную активность, так и в различных зонах гипоталамуса, что может быть обусловлено как спецификой действия передней и задней зон гипоталамуса в период стресс-реакции, так и механизмом генерации отдельных волн.Dynamics of the basic rhythms of hypothalamogram under conditions of stress and action of the right- handed and left-hand vortex pulsed magnetic fields was studied. Ambiguous influence on both various activities and different zones of hypothalamus was revealed. It may be a result of the specific action of anterior and posterior zones of hypothalamus during the stress-response, and of the mechanism of separate waves generation

Dynamic model of elastoplastic normal collision of spherical particles under nonlocal plasticity

The problem of normal collision of a spherical particle with a half-space is considered with allowance for nonlocal plastic deformation in the case where the strength limit depends on the contact radius, as well as for the strengthening effect in the deformed material. The dimensionless coefficient of normal velocity restitution has been calculated numerically as a function of the initial velocity of the spherical particle. The obtained data coincide well with experimental results available in the literature

Spectral luminescence properties of indotricarbocyanine dye in biological tissues

We have established that the shape and position of the maximum in the fluorescence spectrum of an indotricarbocyanine dye in tumor and normal tissues in vivo change over time after intravenous injection of the dye. Based on analysis of the spectral properties of the dye in vivo and in blood plasma, the dependence of the properties on the time since injection has shown that in the living body, the environment of the dye molecule changes as the photosensitizer goes from the skin into the tissue. We have established that in tissues in vivo, the dye molecules are localized in a region with low dielectric constant of the medium. We have shown that the change in the ratio of the concentrations of the different forms of hemoglobin in the blood has an effect on the absorption and shape of the fluorescence spectrum of the dye in tissues in vivo