Nitrogen adsorption on graphene sponges synthesized by annealing a mixture of nickel and carbon powders

The present research has been supported by the National Research Programme for 2014–2017 “Multifunctional Materials and Composites, Photonics and Nanotechnologies”.Adsorption by graphene sponge (GS) manufactured by annealing nickel-carbon powder mixture in inert atmosphere has been studied. By determining the specific surface area (SSA) for the GS sample, it has been found that Brunauer, Emmett, Teller method (BET) of approximation of experimental isotherms gives wrong results in the pressure range of 0.025-0.12 because adsorption in this pressure region is affected by walls of ampoule. Real SSA value has been found by subtracting pore effect method (SPE) or by BET approximation in a low range of relative pressure of 0.0004-0.002.Institute of Solid State Physics, University of Latvia as the Center of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under grant agreement No. 739508, project CAMART

Специальное программное обеспечение для подготовки пилотов

[For the English abstract and full text of the article please see the attached PDF-File (English version follows Russian version)].ABSTRACT The article is devoted to description of methodological problems, occurred during application of special software package intended for training civil aviation personnel within the program «CRM - two-man crew resource management». The authors suggest approaches to solution of main problems in assessment of efficiency of interaction in the aircraft crew, and to realization of suggested solutions. The article continues previously discussed topic (see World of Transport and Transportation Vol. 12, 2014, Iss. 5; Vol. 14, 2016, Iss. 1; Vol. 15, 2017, Iss. 3). Keywords: civil aviation, flight safety, CRM, special software, methodological follow-up.Текст аннотации на англ. языке и полный текст статьи на англ. языке находится в прилагаемом файле ПДФ (англ. версия следует после русской версии).В статье представлено описание методических проблем, возникших в ходе применения пакета специального программного обеспечения, предназначенного для подготовки авиационного персонала по программе «CRM - управление ресурсами двухчленного экипажа». Предложены пути решения основных проблем оценки эффективности взаимодействия в экипаже летательного аппарата, а также намечены пути реализации предложенных решений. Статья продолжает ранее начатую тему (см. «МТ»: 2014, № 5; 2016, № 1; 2017, № 3)

Risk factors for development of lung fat embolism in casualties with severe mechanical trauma

One of the common and difficult to predict complications of injuries is fat embolism. Lethality rate is up to 67% even with intensive modern therapy. The variety of manifestations of fat embolism, the lack of a unified theory of its occurrence and development, the multiplicity and ambiguity of risk factors for fat embolism make it necessary to study in detail the risk factors for the development of fat embolism for its effective prevention and timely therapy. The results of forensic studies of corpses have been studied. The risk of fat embolism is correlated with the functional state of the organism at the time of injury, the peculiarities of injury, the presence and duration of medical care. Statistical processing of the obtained data using the program MedCalc Statistical for biomedical research, software manual (2014) has been performed. Direct negative regression of the ratio of soft tissue and internal organ damage to the degree of fat embolism has been reliably revealed. A slight direct positive regression between the extent of skeletal bone damage and the degree of fat embolism has been found. The development of fat embolism is associated with the presence of infectious and inflammatory processes in the lungs in 30-40% of cases. The fact of polytrauma does not significantly affect the degree of fat embolism. It was reliably determined that a high degree of fat embolism in a smaller part of cases was diagnosed with a combination of soft tissue damage and internal organs. Currently, the existing schemes of medical care for victims do not have a significant impact on the development of fat embolism. A detailed analysis of the provisions of biochemical and colloidal-chemical theories of fat embolism development is necessary for the development and implementation of recommendations for the prevention of embolism in certain categories of traumatological patients.Одним из часто встречающихся и сложно предсказуемых осложнений травм является жировая эмболия. Летальность, несмотря на интенсивную современную терапию, составляет до 67%. В настоящее время многообразие проявлений жировой эмболии, отсутствие единой теории ее возникновения и развития, а также множественность и неоднозначность факторов риска развития жировой эмболии определяют необходимость глубокого изучения факторов риска жировой эмболии для ее эффективной профилактики и своевременной терапии. Были изучены результаты судебно-медицинских исследований трупов. Для определения риска жировой эмболии учитывались функциональное состояние организма на момент травмы, особенности повреждения тканей и органов, наличие и длительность оказания медицинской помощи. Статистическая обработка полученных данных выполнена с помощью программы MedCalc Statistic for biomedical research, software manual 2014. достоверно выявлена прямая отрицательная регрессия соотношения объема повреждений мягких тканей и внутренних органов со степенью жировой эмболии; между объемом повреждения костей скелета и степенью жировой эмболии выявлена незначительная прямая положительная регрессия. развитие жировой эмболии сопряжено с наличием инфекционно-воспалительных процессов в легких в 30-40% случаев. Сделаны выводы о том, что факт политравмы достоверно практически не влияет на степень жировой эмболии, но достоверно выявлено, что высокая степень жировой эмболии в меньшей части случаев диагностирована при сочетании повреждения мягких тканей и внутренних органов. В настоящее время существующие схемы оказания медицинской помощи пострадавшим не оказывают существенного влияния на развитие жировой эмболии. В связи с вышесказанным необходим детальный анализ положений биохимической и коллоидно-химической теорий развития жировой эмболии для разработки и внедрения рекомендаций по профилактике эмболии у определенных категорий травматологических больных

Heat and mass transfer in two-phase flow motion in minichannel under variable heating

Experimental studying the effect of temperature on evaporation dynamics of the stationary horizontal liquid layer is presented. The average evaporation flow rate of liquid layer (ethanol) by the gas flow (air) has been calculated using two independent methods. The dependence of the evaporation flow rate from the temperature has been obtained. According to the analysis of the results it was found that the dependence is nonlinear and described by an exponential function

Heat and mass transfer in two-phase flow motion in minichannel under variable heating

Experimental studying the effect of temperature on evaporation dynamics of the stationary horizontal liquid layer is presented. The average evaporation flow rate of liquid layer (ethanol) by the gas flow (air) has been calculated using two independent methods. The dependence of the evaporation flow rate from the temperature has been obtained. According to the analysis of the results it was found that the dependence is nonlinear and described by an exponential function

Nitrogen Adsorption by Thermoexfoliated Graphite

Adsorption by thermochemically exfoliated graphite (TEG) is studied and compared with that by other carbon structures under the same conditions. In BET determination of the specific surface area (SBET) for the TEG samples it was found that good approximation could be observed in two different pressure ranges. Such ranges of BET approximation are also visible in the isotherms of aquadag and milled graphite. The experimental results are discussed and their interpretation proposed

Graphene Nanosheets Grown on Ni Particles

Ultrathin graphite sheets or/and graphene nanosheets were obtained on the surface of particles of Ni powder. The new method based on well known dissolution and precipitation mechanism of graphene formation on catalyst surface is reported. Fig.1a presents the Ni powder particles with as prepared graphene sheets. Graphene nanosheets can be seen on the surface of Ni beads as grey coating on light beads. Freestanding graphene sheets were obtained after dissolution of Ni. Upon dissolution of the Ni powder is possible disintegration of the coating into the individual graphene sheets or the graphene sheets are formed the carbon body in the form of the original ingot sintered powder of Ni. In the first case graphene samples were obtained by vacuum filtration, in the second after drying of carbon body. SEM images (Fig. 1b) revealed that surface of the bodies consist of randomly aggregated, crumpled sheets closely associated with each other. The thickness of these sheets was determined with XRD by (002) diffraction peak broadening (Fig. 3). The quality of the sheets was estimated by Raman scattering spectra. Obtained by us layers can be defined as a graphene nanosheets. Number of graphene monolayers in these nanosheets controllably varied from 7 to 40

Influence of structural resonance electromagnetic therapy on psychoemotional status normalization in patients with osteoarthritis

Резюме 94 больных остеоартрозом (ОА) были разделены на две группы, сопоставимые по полу, возрасту и длительности заболевания: основную (п=56) и контрольную (п=38). Пациенты обеих групп получали аналогичное медикаментозное и физиотерапевтическое лечение. Кроме того, больным основной группы проводили дополнительно сеансы структурно-резонансной электромагнитной (СРЭМ) терапии. Сравнительные исследования показали значительное преимущество включения СРЭМ в комплексное лечение больных ОА. СРЭМ терапия способствовала уменьшению или полному купированию болевого синдрома, оказывала позитивное влияние на тревожно-депрессивные нарушения, способствовала социально-психологической адаптации пациентов с ОА