Vortex families near a spectral edge in the Gross-Pitaevskii equation with a two-dimensional periodic potential

We examine numerically vortex families near band edges of the Bloch wave spectrum in the Gross--Pitaevskii equation with a two-dimensional periodic potential and in the discrete nonlinear Schroedinger equation. We show that besides vortex families that terminate at a small distance from the band edges via fold bifurcations there exist vortex families that are continued all way to the band edges.Comment: 12 pages, 8 figure

Correspondence between theory and practice of a Beerkan infiltration experiment

The Beerkan infiltration experiment is carried out by inserting the ring a short depth into the soil and establishing a positive head of water on the infiltration surface for at least a part of the run. Nevertheless, the data are analyzed by assuming a fully unconfined infiltration process (ring insertion depth, d = 0 cm) and a null ponded depth of water (H = 0 cm). The influence of ring insertion and ponded water on an infiltration process of 2 h sampled every minute was tested in this numerical investigation. Five soils varying from sand to silt loam, three ring radii (5–15 cm), and the Beerkan-specific range of values for both d and H (between 0 and 1 cm) were considered. The differences between the theoretical (d = H = 0 cm) and the practical (d = H = 1 cm) setups varied from −10.4 to +8.6% for the mean infiltration rate and from −10.2 to +8.3% for the final cumulative infiltration. These differences were small, and they decreased in absolute value by considering a soil-dependent ring radius. In particular, nearly negligible differences were detected using a small ring in coarse-textured soils and a large ring in fine-textured soils. In the coarser soils, inserting the ring and establishing a ponded depth of water did not alter the estimated coefficients of the two-parameter infiltration model appreciably with the cumulative linearization method, because these coefficients differed between the theoretical and practical setups by no more than 9.2%. In fine soils, linearization could not be possible regardless of the considered setup, or it was the use of d = H = 1 cm instead of d = H = 0 cm that impeded a convincing linearization of the data. In conclusion, the good correspondence, in many circumstances, between the theoretical and the practical Beerkan infiltration experiment reinforced the interest in this simple experiment as a practical means to collect infiltration data in the field

Russian Realism of the 19th Century. Society, Knowledge, Narrative

Поступила в редакцию: 25.10.2022. Принята к печати: 02.02.2023.Submitted: 25.10.2022. Accepted: 02.02.2023.Рецензия на книгу: Русский реализм XIX века. Общество, знание, повествование : cб. ст. / под ред. М. Вайсман, А. Вдовина, И. Клигера, К. Осповата. — М. : Новое литературное обозрение, 2020. — 568 с. В центре внимания данной рецензии находится концептуализация русского реализма XIX в., которая представлена в отдельных статьях научного сборника «Русский реализм XIX века. Общество, знание, повествование». Рассматриваются цели, поставленные во вводной статье сборника, и их разработка в конкретных исследованиях. Оценивается тенденция актуализировать уже проделанную работу в осмыслении понятия «реализм», вновь обратить на него должное внимание и совместить взгляды русских исследователей с работами зарубежных специалистов. Отмечается, что авторам отдельных статей сборника удается направлять внимание не только на выбранные аспекты изучения конкретных литературных произведений писателей-реалистов ХIX в., но и на те факторы, внешние по отношению к их творчеству, которые во многом определяли темы, сюжеты и ценностные ориентиры данных произведений. В рецензии также указывается на то, что, постигая некоторые специфические черты конкретных литературных произведений и реализма как универсального феномена, авторы сборника обращают внимание чаще всего на частные вопросы. Оценивая проделанную работу и тенденцию сравнивать произведения русских писателей с западноевропейскими, приходится констатировать, что авторам указанного сборника не всегда удается в должной мере обобщать достигаемые результаты исследований, указывать именно на то, что в реализме универсально, а что, к примеру, типично и характерно для русского реализма XIX в.Review of: Weisman, M., Vdovin, A., Klieger, I., & Ospovat, K. (Eds.). (2020). Russkii realizm XIX veka. Obshchestvo, znanie, povestvovanie [Russian Realism of the 19th Century. Society, Knowledge, Narrative]. Moscow: Novoe literaturnoe obozrenie. 568 p. This text responds to the conceptualisation of nineteenth-century Russian realism presented in separate chapters of the monograph Russian Realism of the 19th Century. Society, Knowledge, Narrative. The review examines the objectives set in the introductory article of the collection and their development in specific studies. The review evaluates the tendency to actualise the work done so far in understanding the concept of “realism”, to pay attention to it again, and combine the views of Russian researchers with the works of foreign scholars. The authors of individual articles of the collection manage to direct their attention to the chosen aspects of studying not only of specific literary works of realist writers of the nineteenth century, but also to those factors external to their creative activities which in many respects determined the themes, subjects, and value orientation of their works. The review also points out that, while comprehending some specific features and specific literary works, and realism as a universal phenomenon, the authors often pay attention to rather private issues. Assessing the work done and the tendency to compare the works of Russian writers with Western ones, it is stated that the authors of individual chapters are not always able to summarise the results of the research and point out exactly what is universal in realism, and what is typical of the Russian realism of the nineteenth century

Low-power Renewable Possibilities for Geothermal IoT Monitoring Systems

Nowadays, humanity is facing a difficult challenge, because of sustainable energy use and production. One of the major ways to solve this problem is the usage of renewable energy as a sustainable and reliable source of electric power and heat. This trend is also obvious in the field of the Internet of Things (IoT), where research teams are increasingly focusing on renewable energy and its monitoring with IoT. This paper aims to map current research on the use of the Internet of Things with a special focus on use in geothermal applications. Information concerning renewable geothermal energy sources and individual IoT communication technologies is summarized. A basic Bluetooth iBeacon test case is also presented.©2022 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.fi=vertaisarvioitu|en=peerReviewed

Temperature dependence of binary and ternary recombination of H3+ ions with electron

We study binary and the recently discovered process of ternary He-assisted recombination of H3+ ions with electrons in a low temperature afterglow plasma. The experiments are carried out over a broad range of pressures and temperatures of an afterglow plasma in a helium buffer gas. Binary and He-assisted ternary recombination are observed and the corresponding recombination rate coefficients are extracted for temperatures from 77 K to 330 K. We describe the observed ternary recombination as a two-step mechanism: First, a rotationally-excited long-lived neutral molecule H3* is formed in electron-H3+ collisions. Second, the H3* molecule collides with a helium atom that leads to the formation of a very long-lived Rydberg state with high orbital momentum. We present calculations of the lifetimes of H3* and of the ternary recombination rate coefficients for para and ortho-H3+. The calculations show a large difference between the ternary recombination rate coefficients of ortho- and para-H3+ at temperatures below 300 K. The measured binary and ternary rate coefficients are in reasonable agreement with the calculated values.Comment: 15 page

Investigating biological activity spectrum for novel styrylquinazoline analogues

In this study, series of ring-substituted 2-styrylquinazolin-4(3H)-one and 4-chloro-2-styrylquinazoline derivatives were prepared. The syntheses of the discussed compounds are presented. The compounds were analyzed by RP-HPLC to determine lipophilicity. They were tested for their inhibitory activity on photosynthetic electron transport (PET) in spinach (Spinacia oleracea L.) chloroplasts. Primary in vitro screening of the synthesized compounds was also performed against four mycobacterial strains and against eight fungal strains. Several compounds showed biological activity comparable with or higher than that of the standard isoniazid. It was found that the electronic properties of the R substituent, and not the total lipophilicity of the compound, were decisive for the photosynthesis-inhibiting activity of tested compounds

Temperature dependence of binary and ternary recombination of D-3(+) ions with electrons

Flowing and stationary afterglow experiments were performed to study the recombination of D-3(+) ions with electrons at temperatures from 77 to 300 K. A linear dependence of apparent (effective) binary recombination rate coefficients on the pressure of the helium buffer gas was observed. Binary (D-3(+)+e(-)) and ternary (D-3(+)+e(-)+He) recombination rate coefficients were derived. The obtained binary rate coefficient agrees with recent theoretical values for dissociative recombination of D-3(+). We describe the observed ternary process by a mechanism with two rate determining steps. In the first step, a rotationally excited long-lived neutral D-3* is formed in D-3(+)-e(-) collisions. As the second step, the D-3* collides with a helium atom that prevents autoionization of D-3*. We calculate lifetimes of D-3* formed from ortho-, para-, or metastates of D-3(+) and use the lifetimes to calculate ternary recombination rate coefficients

Temperature dependence of binary and ternary recombination of H3+ ions with electron

We study binary and the recently discovered process of ternary He-assisted recombination of H3+ ions with electrons in a low temperature afterglow plasma. The experiments are carried out over a broad range of pressures and temperatures of an afterglow plasma in a helium buffer gas. Binary and He-assisted ternary recombination are observed and the corresponding recombination rate coefficients are extracted for temperatures from 77 K to 330 K. We describe the observed ternary recombination as a two-step mechanism: First, a rotationally-excited long-lived neutral molecule H3* is formed in electron-H3+ collisions. Second, the H3* molecule collides with a helium atom that leads to the formation of a very long-lived Rydberg state with high orbital momentum. We present calculations of the lifetimes of H3* and of the ternary recombination rate coefficients for para and ortho-H3+. The calculations show a large difference between the ternary recombination rate coefficients of ortho- and para-H3+ at temperatures below 300 K. The measured binary and ternary rate coefficients are in reasonable agreement with the calculated values.Comment: 15 page

The Suffering Hero in Leonid Andreyev’s Novel The Yoke of War: From the Personal to the Universal

The article was submitted on 28.01.2021.Статья посвящена изучению романа Л. Н. Андреева «Иго войны». Авторы исследуют постепенный переход «объективных» дневниковых записей героя романа к резко субъективным, в которых чувствуется амбивалентное восприятие войны, пагубно влияющее на жизнь в тылу. Герой романа, изначально мыслящий рационально, постепенно переживает целый ряд личных и общественных катастроф, причиной которых прямо или опосредованно является война, и доходит до убеждения, что ни он как одиночка, «клеточка», ни люди его склада не имеют никакого влияния на ход истории, что война так же беспощадно губит не только «своих», но и врагов. Противоречивые изменения во внутреннем мире героя отражают его сомнения и в патриотизме, и в правоте «народа», и в смысле войны для государства, так как на ней наживаются малые группы хищных предпринимателей. Осознав обреченность при трагическом исходе войны, герой не способен больше действовать рационально. Он принимает все потери – и личные, и общественные – и доходит до чисто эмоционального чувства всеобщей несправедливости войны. Единственное, что он способен сделать, это помощь раненым солдатам. Андреев охватывает в романе широкий круг проблем, указывая на некоторые тематические оси, связывающие переживания и судьбы индивида и с его личным перерождением, и с отношениями с наиболее близкими ему членами его семьи, и с окружающим его обществом в узком и более абстрактном понимании. Роман, однако, доходит и до философских вопросов о смысле таких возвышенных понятий, как патриотизм, судьба Родины, сопричастность к народной массе, смысл индивидуального существования, представляя, по сути, философский, общечеловеческий взгляд на Первую мировую войну. Продолжая во многом традиции классической русской литературы, Андреев задает вопросы на общечеловеческом уровне.This article analyses Leonid Andreyev´s novel The Yoke of War. The authors of the study point out the gradual transition from “objective” diary records to highly subjective records that show an ambivalent attitude towards the war as a cause for damaging changes on the home front. The main character, whose thoughts are rational at the beginning, experiences a lot of personal and social catastrophes generated directly or indirectly by the war. Gradually, he comes to the conclusion that neither he as an individual (as a “cell”) nor other people of his type have any impact on the course of history; he sees that the war is killing both enemies and “our people”. Contradictory changes in the character’s inner world show his doubts about patriotism and the righteousness of the “people”, while his belief that war only benefits a small group of greedy entrepreneurs grows. Feeling that the war cannot have a happy ending, the main character is no longer able to act rationally. He accepts all losses – personal and social – and comes to a purely emotional feeling about the universal unfairness of war. The only remaining possibility is to help wounded soldiers. Andreyev depicts a broad range of issues that thematically concern the experience and destiny of an individual, his inner transformation, the fate of his family members, and the destiny of both real and abstract society. The novel touches upon certain philosophical issues concerning such notions as patriotism, Russia’s fate, the sense of belonging to the masses, and being an individual. In this way, the novel can be regarded as a philosophical and panhuman view of World War I. Following the traditions of classical Russian literature to a considerable extent, Andreyev is concerned with questions based not on narrow class or national foundations but on panhuman ones