The detection equipment of the DANSS setup includes 2500 silicon photomultipliers and approximately 100 photomultiplier tubes (PMTs). The system of data acquisition from these photosensors is based ...on waveform digitization, with which it is possible to simultaneously obtain both amplitude and timing information. The modules of waveform digitizers (WFDs) are made to the VME standard and allow parallel digitization of 64 differential signals at a frequency of 125 MHz with a 12-bit amplitude resolution. The programmable logic of the WFDs provides production of the system trigger based on the analysis of the PMT signals and its propagation without any additional hardware. Owing to the extremely low analog noise, it is possible to use the full dynamic range of the digitization. These WFD modules are superior to other similar modules in the throughput and may find wide application to perform similar tasks of waveform digitization.
The entropies of iron, cobalt, rhodium, and platinum are studied for the first time, based on acoustic data and using the Debye theory and rigid-sphere model, from 298 K up to the boiling point. A ...formula for the melting entropy of metals is validated. Good agreement between the research results and the literature data is obtained.
The mobility of ions in a liquid binary metal system based on aluminum is calculated for the first time in a wide range of concentrations, based on studies of its resistivity and self-diffusion ...coefficient. It is established that in an Al–Cu system, the ions of aluminum move to the anode, while Al–Mg, Al–Sn, and Al–Sb move to the cathode; i.e., there is inversion of the electrotransfer of aluminum ions. When the concentration of a component is reduced, the mobility of its ions is increased by the module.
The coordination numbers of transition metal atoms (Hf, Nb, Cr, Mo, W, Re, Ru, Rh, Os, Ir, Pt) are calculated using acoustic data from 0 K to temperatures close to boiling. It is concluded that the ...coordination numbers (CNs) of transition metal atoms are close to those of a body-centered cubic (BCC) structure (a CN of 8) in the solid phase and intermediate between BCC and simple cubic lattices in the liquid phase (a CN of 6).
Purpose: To examine the predictors of acute myocardial infarction development and to evaluate the relationship of the radiation component (external γ-radiation) with the probability of developing ...acute myocardial infarction in workers of radiation-dangerous plants working age (under 60 for men, 55 for women), by the example of the Siberian Group of Chemical Enterprises personnel.
Material and methods: The work is based on the results of a prospective population study (1998–2013). The diagnosis of acute myocardial infarction was verified in 540 people of working age (34 women and 506 men). For each case selected control (n = 1,080) among the employees of the Siberian Group of Chemical Enterprises, passed periodic medical examination in the study period. Every person was described by means of 46 variables including characteristics of social status, a number of risk factors, associated diseases, biochemical indices including the level of general cholesterol, the main clinical data, cumulative dose of external radiation and the amount of 239Pu content in an organism.
Results: It was determined that in the group of the personnel of working age the most important traditional predictors of acute myocardial infarction, less important factor in the pathogenesis of the disease are conditions of the individual accumulation of a dose, but not the magnitude of the total external doses in the evaluation range.
Conclusion: To improve the system of preventive measures aimed at reducing the level of morbidity and mortality from acute myocardial infarction, it is recommended to form risk groups taking into account the most significant predictors of this disease (age, systolic blood pressure, smoking). For the personnel of radiation dangerous plants working age insignificant conditions for the formation of radiation dose (age of first exposure, the rate of accumulation of radiation dose, duration of exposure) under conditions of trouble-free operation of the equipment.
Active measures for the diagnosis of coronary heart disease and targeted correction of detected somatic disorders for the prevention of acute vascular catastrophes are expedient for workers of radiation hazardous industries from 40 to 60 years with an individual risk of acute myocardial infarction less than 50 % using the model described below.
DANSS is a highly segmented plastic scintillator detector, which uses scintillator strips with a Gd-loaded reflective cover to detect reactor antineutrino by inverse beta-decay. Light is collected ...with wave length shifting fibers (3 per strip) placed in grooves. Therefore the distribution of light output could be significantly non-uniform. Transverse profile of light output was studied in ITEP at a test bench consisting of proportional chambers and scintillator strips. Tracks of cosmic particles, which crossed chambers, were reconstructed with high accuracy, whereby transverse profiles of light output were built with step 1 mm for six scintillator strips. This result is important for calibration of DANSS and the method could be useful in constructing similar detectors.
The present article contains the research data of pathopsychological predictors of contraindications to driving for persons with mental disorders. The data of 60 outpatient charts of patients-drivers ...and driver candidates who underwent a psychiatric examination in order to reveal the presence or absence of contraindications to driving was analyzed and resulted in a psychiatric diagnosis setting for the first time. The analysis was conducted with considering the following parameters: the commission decision on the presence or absence of contraindications to driving; age; mental illness diagnosis; results of pathopsychological research and data on driving experience. It was revealed that the 'criticality violation' parameter was the universal pathopsychological predictor of contraindications amongst the drivers and driver candidates surveyed. At the same time, nosospecific abnormalities of mental processes have been identified that in overall affect on the making of a medical decision on the presence of contraindications to driving. Attention disorders (its instability) were significantly more frequent, whilst the patients with organic mental disorder also had criticality violations, and the patients with personality disorder were characterized by instability of emotional reactions. Additional record of pathopsychological features can significantly improve the accuracy of the ability to safe driving assessment for drivers and driver candidates, and more effectively predict the risk of an accident.
В статье приводятся данные исследования патопсихологических предикторов противопоказаний к управлению автотранспортом у лиц с психическими расстройствами. Проанализированы данные 60 амбулаторных карт пациентов – водителей и кандидатов в водители, проходивших психиатрическое освидетельствование на предмет выявления наличия или отсутствия противопоказаний к управлению автотранспортом, по итогам которого им был впервые выставлен психиатрических диагноз. Анализ проводился с учетом следующих параметров: решение комиссии о наличии или отсутствии противопоказаний к управлению автотранспортом; возраст; диагноз психического расстройства; результаты патопсихологического исследования и данные об опыте вождения. Выявлено, что универсальным патопсихологическим предиктором противопоказаний у обследованных водителей и кандидатов в водители выступил параметр «нарушение критичности». Вместе с тем, определены нозоспецифические нарушения психических процессов, влияющие на вынесение врачебного решения о наличии противопоказаний к управлению автотранспортом. У всех обследованных значимо чаще встречались нарушения внимания (его неустойчивость), в то время как у лиц с диагнозом органического психического расстройства отмечается также нарушение критичности, а пациентов с расстройством личности отличает неустойчивость эмоциональных реакций. Дополнительный учет патопсихологических особенностей может существенно повысить точность оценки способности к безопасному вождению у водителей и кандидатов в водители и эффективность прогнозирования риска совершения ДТП.
The mobility of ions in binary iron-based liquid metal systems is calculated for the first time, based on studies on the specific resistance and self-diffusion coefficient in a wide range of ...concentrations. It is established that iron ions move toward the anode in Fe–V and Fe–Mo systems, and toward the cathode in Fe–W and Fe–Pt systems; i.e., there is inversion of electrotransport for iron ions. When the concentration of a component is reduced, the mobility of its ions grows in modulus.
For the first time, the electronic properties of liquid metals (charge carrier concentration, relaxation frequency, effective concentration of conduction electrons), including all groups of the ...periodic system (Na, Mg, La, Hf, Nb, Cr, Mn, Fe), have been studied in wide temperature range using acoustic data.
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