Shock-wave heating mechanism of the distant solar wind: explanation of Voyager-2 data

One of the important discoveries made by Voyager-2 is the nonadiabatic radial profile of the solar wind proton temperature. This phenomenon has been studied for several decades. The dissipation of turbulence energy has been proposed as the main physical process responsible for the temperature profile. The turbulence is both convected with the solar wind and originated in the solar wind by the compressions and shears in the flows and by pick-up ions. The compression source of the solar wind heating in the outer heliosphere appears due to shock waves, which originated either in the solar corona or in the solar wind itself. The goal of this work is to demonstrate that the shock-wave heating itself is enough to explain the temperature profile obtained by Voyager-2. The effect of shock-wave heating is demonstrated in the frame of a very simple spherically symmetric high-resolution (in both space and time) gas-dynamical data-driven solar wind model. This data-driven model employs the solar-wind parameters at 1 AU with minute resolution. The data are taken from the NASA OMNIWeb database. It is important to underline that (1) the model captures the shocks traveling and/or originating in the solar wind, and (2) other sources of heating are not taken into account in the model. We extended this simple model to the magnetohydrodynamic (MHD) and two-component models and found very similar results. The results of the numerical modeling with the one-minute OMNI data as the boundary condition show very good agreement with the solar-wind temperature profiles obtained by Voyager-2. It is also noteworthy that the numerical results with daily averaged OMNI data show a very similar temperature profile, while the numerical runs with 27-day-averaged OMNI data demonstrate the adiabatic behavior of the temperature.Comment: 12 pages, 7 figure

Temperature Effects in the Composition of Metal Halide Perovskite thin Films

Metal halide perovskites have shown to be a structure with great promise as an efficient photovoltaic, but at the same time it is affected by instability problems that degrade their performance. Degradation mechanisms vary with temperature, moisture, oxidation, and energy conversion during light exposure. We study performance loss due to temperature by probing diffusion of elemental composition across the thickness of films produced by spin coating and for temperatures ranging from 20 to 200°C. X-ray reflectivity was used to identify the electron density, composition, and quality of the films, aided with X-ray fluorescence and X-ray photoelectron spectroscopy studies to obtain information about degradation of the organic phase of the films

Adsorption of Hexacontane on Hexagonal Boron Nitride

© 2018 American Chemical Society. We have investigated the adsorption of hexacontane (C60H122) on hexagonal boron nitride (hBN) using atomic force microscopy (AFM). The molecules can be deposited either by sublimation or from solution and form lamellar rows with dimensions of the order of 0.1-1 μm in three different rotational domains. High-resolution AFM images reveal that, similar to alkanes on graphite, the molecules are adsorbed parallel to the lattice vectors of hBN and we show using molecular mechanics that this corresponds to the lowest energy configuration. Lamellar rows with the same periodicity are observed even when several layers of hexacontane are deposited, although there is some orientational disorder in these multilayers. We also observe heat-induced modification of hexacontane, including recrystallization. We compare our results with recent X-ray studies of alkane adsorption on hBN and discuss the possible role of alkanes on steering molecular self-assembly on hBN

Роль ферментативного парапанкреатита в течении ранней фазы острого деструктивного панкреатита

Introduction. One of the most significant components of acute destructive pancreatitis (ADP) is enzymatic parapancreatitis (EP). The severity of the defeat of the retroperitoneal tissue from the early stages of the disease largely determines its course.The objectivewas to assess the features of the evolution of the pathological process in the retroperitoneal tissue in ADP and the effect of EP on the course of phase I of ADP.Methods and materials. 63 cases (ADP) without enzymatic peritonitis were analyzed. The average age of patients was (46.6±3.2) years (p≤0.05). The sum of points according to the express diagnostic scale of the SPb I. I. Dzhanelidze RIEM was (3.7±0.2) points (p≤0.05). The average time from the onset of the disease to the start of therapy was 2 days (from 7 to 1 day).Results. Types of EP at admission were distributed as follows: type B – 17.5 % (n=11) of cases, type C – 44.4 % (n=28) of cases, type D – 30.2 % (n=19) of cases, type E – 7.9 % (n=5) of cases. Spearman’s rank correlation coefficient for assessing the relationship between the severity of the condition and the type of parapancreatitis was 0.069. Infiltrative parapancreatitis (IP) was formed in 93.4 % of cases. The types of infiltrative parapancreatitis (pancreatic infiltrate) were distributed as follows: type A – 12.3 % (n=7) of cases, type B – 21.1 % (n=12) of cases, type C – 36.8 % (n=21) of cases, type D – 19.3 % (n=11) of cases, type E – 10.5 % (n=6) of cases. There was a pronounced relation between the severity of the patient’s condition and the prevalence of IP, the Spearman’s rank correlation coefficient was 0.82.Conclusions. EP is formed in most cases of acute destructive pancreatitis and is evolutionary. It has a significant effect on the severity of the patient’s condition and the course of acute destructive pancreatitis in the infiltrative phase of the disease.Введение. Одним из наиболее значимых компонентов острого деструктивного панкреатита (ОДП) является ферментативный парапанкреатит (ФП). Выраженность поражения забрюшинной клетчатки с ранних сроков заболевания в значимой мере определяет его течение.Цель – оценка особенностей эволюции патологического процесса в забрюшинной клетчатке при ОДП и влияние ФП на течение I фазы ОДП.Методы и материалы. Проанализированы 63 случая (ОДП) без явлений ферментативного перитонита. Средний воз- раст пациентов – (46,6±3,2) года (р≤0,05). Сумма баллов по экспресс шкале НИИ СП им. И. И. Джанелидзе составила (3,7±0,2) балла (р≤0,05). Средние сроки от начала заболевания до начала терапии составляли 2 суток (от 7 до 1 суток).Результаты. Типы ФП на момент поступления распределились следующим образом: тип В – 17,5 % (n=11) случаев, тип С – 44,4 % (n=28) случаев, тип D – 30,2 % (n=19) случаев, тип Е – 7,9 % (n=5) случаев. Критерий Спирмена при оценке связи тяжести состояния и типа парапанкреатита равнялся 0,069. Инфильтративный парапанкреатит (ИФ) сформировался в 93,4 % случаев. Типы инфильтративного парапанкреатита (панкреатического инфильтрата) распределились следующим образом: тип А – 12,3 % (n=7) случаев, тип B – 21,1 % (n=12) случаев, тип С – 36,8 % (n=21) случаев, тип D – 19,3 % (n=11) случаев, тип Е – 10,5 % (n=6) случаев. Отмечается выраженная связь тяжести состояния пациентов с распространенностью ИФ, корреляционный коэффициент Спирмена составил 0,82.Выводы. ФП формируется в большинстве случаев острого деструктивного панкреатита и носит эволюционный характер. Значимое влияние на тяжесть состояния пациента и течение острого деструктивного панкреатита оказывает в инфильтративную фазу заболевания

ГОСУДАРСТВЕННО-ЧАСТНОЕ ПАРТНЕРСТВО В АТОМНОЙ ЭНЕРГЕТИКЕ: ОПЫТ США

The public-private partnership (PPP) is a mechanism suited for running nuclear power plant (NPP) construction projects under conditions of limited state funding. The USA PPP experience with its 50-year tradition and real results achieved in the XXI century is undoubtedly the most mature in the global nuclear power industry: in 2008 the NPP construction project (Vogl, 3, 4) was launched in the USA being the first in 30 years. The PPP adaptation to new NPP projects is in demand both in Russia and abroad. The study of the American PPP practice in the nuclear industry includes the historical review, the comparative analysis of the liberalized and regulated energy markets as well as the survey of the legal and regulatory incentives that had an impact on the Vogl NPP project. The government at the federal and regional levels is taking the following measures to make the partnership attractive for all participants: the program of government guarantees for the US Department of Energy loans; the state system of the NPP owner liability insurance in the event of a nuclear accident; granting NPP owners a permission to include their NPP construction investments into tariff rates of energy consumers, etc. The study used the methods of analysis and synthesis, including the problem-chronological and logical analysis, as well as case studies. Based on the research findings, three fundamental components of a successful PPP for NPP projects were identified: guaranteed return on investments as a result of the stable and receptive market of energy sales at long-term fixed rates and stable costs of energy generation by nuclear power plants, actually independent of the uranium market situation; a solid national nuclear energy support policy implemented in specific support programs; a proactive approach of Vogl NPP shareholders. In the future, the analysis of the PPP experience of other countries in the nuclear industry (e. g., Finland, France, South Korea) will allow creation of a holistic PPP concept, which will make it possible to develop recommendations tailored to the specific features of individual NPP projects.Одним из перспективных механизмов реализации проектов сооружения АЭС в современных условиях ограниченности государственного финансирования является государственно-частное партнерство (ГЧП). Самым зрелым в мировой атомной отрасли является опыт США по ГЧП, который имеет 50-летние традиции и реальные результаты в XXI в.: в 2008 г. здесь впервые за 30 лет стартовал проект сооружения АЭС (Вогл, 3, 4). Адаптация ГЧП для реализации новых проектов АЭС востребована как в России, так и за рубежом. Изучение американской практики ГЧП в атомной энергетике охватывает исторический экскурс, сравнительный анализ либерализованных и регулируемых рынков электроэнергии, а также исследование правовых и регуляторных стимулов, оказавших влияние на проект АЭС Вогл. Правительство на федеральном и региональном уровнях предпринимает следующие меры для организации привлекательного для всех участников партнерства: программа госгарантий по кредитам Минэнерго США, государственная система страхования ответственности владельцев АЭС в случае ядерного инцидента, разрешение владельцам АЭС включать свои инвестиции на сооружение АЭС в тарифы энергопотребителей и др. В исследовании использованы методы анализа, в том числе проблемно-хронологического и логического, и синтеза, а также кейс-стадии. По итогам исследования выделены три основополагающих элемента успешного ГЧП для проектов АЭС: гарантии возврата инвестиций, благодаря стабильному и емкому рынку сбыта электроэнергии по долгосрочно фиксированным тарифам и стабильной стоимости генерации электроэнергии на АЭС, практически не зависящей от конъюнктуры уранового рынка; твердый курс национальной политики на поддержку развития атомной энергетики, реализованный в конкретных программах поддержки; проактивный подход акционеров АЭС Вогл. В перспективе анализ опыта других стран по ГЧП в атомной отрасли (например, Финляндии, Франции, Южной Кореи) позволит создать холистическую концепцию ГЧП, на основании которой можно разрабатывать рекомендации, адаптированные под особенности конкретных проектов АЭС

Observation of the Isospin-Violating Decay Ds∗+→Ds+π0D_s^{*+}\to D_s^+\pi^0

Using data collected with the CLEO~II detector, we have observed the isospin-violating decay $D_s^{*+}\to D_s^+\pi^0$. The decay rate for this mode, relative to the dominant radiative decay, is found to be $\Gamma(D_s^{*+}\to D_s^+\pi^0)/\Gamma(D_s^{*+}\to D_s^+\gamma)= 0.062^{+0.020}_{-0.018}\pm0.022$.Comment: 8 page uuencoded postscript file, also available through http://w4.lns.cornell.edu/public/CLN

Measurements of the Ratios B(Ds+→ηℓ+ν)/B(Ds+→ϕℓ+ν){\cal B}(D_s^+\to \eta\ell^+\nu)/{\cal B}(D_s^+\to \phi\ell^+\nu) and B(Ds+→η′ℓ+ν)/B(Ds+→ϕℓ+ν){\cal B}(D_s^+\to \eta'\ell^+\nu)/{\cal B}(D_s^+\to \phi\ell^+\nu)

Using the CLEO~II detector we measure ${\cal B}(D_s^+\to \eta e^+\nu)/{\cal B}(D_s^+\to \phi e^+\nu) =1.24\pm0.12\pm0.15$, ${\cal B}(D_s^+\to \eta' e^+\nu)/{\cal B}(D_s^+\to \phi e^+\nu) =0.43\pm0.11\pm0.07$ and ${\cal B}(D_s^+\to \eta' e^+\nu)/{\cal B}(D_s^+\to \eta e^+\nu) =0.35\pm0.09\pm0.07$. We find the vector to pseudoscalar ratio, ${\cal B}(D_s^+\to \phi e^+\nu)/{\cal B}(D_s^+\to (\eta+\eta') e^+\nu) =0.60\pm0.06\pm0.06$, which is similar to the ratio found in non strange $D$ decays.Comment: 11 page uuencoded postscript file, postscript file also available through http://w4.lns.cornell.edu/public/CLN