246 research outputs found
CSD 1791492: Experimental Crystal Structure Determination
No full textRelated Article: Zoran Mazej, Evgeny Goreshnik, Zvonko Jaglicic, Yaroslav Filinchuk, Nikolay Tumanov, Lev G. Akselrud|2017|Eur.J.Inorg.Chem.||2130|doi:10.1002/ejic.20170005
CSD 1791491: Experimental Crystal Structure Determination
No full textRelated Article: Zoran Mazej, Evgeny Goreshnik, Zvonko Jaglicic, Yaroslav Filinchuk, Nikolay Tumanov, Lev G. Akselrud|2017|Eur.J.Inorg.Chem.||2130|doi:10.1002/ejic.20170005
CSD 1791493: Experimental Crystal Structure Determination
No full textRelated Article: Zoran Mazej, Evgeny Goreshnik, Zvonko Jaglicic, Yaroslav Filinchuk, Nikolay Tumanov, Lev G. Akselrud|2017|Eur.J.Inorg.Chem.||2130|doi:10.1002/ejic.20170005
Author Lev Raphael reads from his work at the Michigan Writers Series
No full textInternationally acclaimed author and Greater Lansing resident, Lev Raphael, reads from his memoir "My Germany". He recounts his travels to the NAZI labor camp where his mother was held during World War II and coming to terms with his mother's traumatic past. Introduced by Michigan State University Librarian Michael Rodriguez at an event held at the MSU Main Library. Part of the Michigan State University Libraries' Michigan Writers Series
Role of personality in scientific advancement (dedicated to the eightieth anniversary of the birth of Lev G. Gassanov)
No full textThe article is dedicated to Lev G. Gassanov who between 1974 and 1991 headed the "Saturn" Research Institute. Lev Gassanov was an outstanding personality, a talented leader, organizer and scholar, author of many books, scientific works and inventions, he founded a national school for the creation of a broad range of micropower electronics devices and systems
Role of personality in scientific advancement (dedicated to the eightieth anniversary of the birth of Lev G. Gassanov)
No full textСтатья посвящена Льву Гассановичу Гассанову, который с 1974 до 1991 года возглавлял НИИ «Сатурн». Незаурядная личность, талантливый руководитель, организатор и ученый, автор многих монографий, научных работ и изобретений, он основал отечественную школу по созданию широкого класса приборов, устройств и систем микромощной электроники.Стаття присвячена Льву Гассановичу Гассанову, який з 1974 до 1991 року очолював НДІ «Сатурн». Непересічна особистість, талановитий керівник, організатор і вчений, автор багатьох монографій, наукових праць і винаходів, він заснував вітчизняну школу зі створення широкого класу приладів, пристроїв і систем мікропотужної електроніки.The article is dedicated to Lev G. Gassanov who between 1974 and 1991 headed the "Saturn" Research Institute. Lev Gassanov was an outstanding personality, a talented leader, organizer and scholar, author of many books, scientific works and inventions, he founded a national school for the creation of a broad range of micropower electronics devices and systems
L'archivio come montaggio? Il caso di Lev Tolstoj
No full textL’A. indaga il caso dell’archivio di Lev Tolstoj, oggi conservato presso il Museo Statale “Lev Tolstoj” a Mosca, con particolare attenzione al significato che la dialettica privato-pubblico assunse nella storia della sua creazione. La questione della conservazione degli scritti di Tolstoj si pose infatti fin da subito nei termini di un conflitto tra la dimensione privata e quella pubblica, rappresentate rispettivamente dai due soggetti produttori dell’archivio: la moglie di Tolstoj, S. A. Tolstaja, e l’amico V. G. Čertkov. Nell’articolo, da una parte, si ripercorrono le fasi salienti della guerra per il possesso delle carte che vide fronteggiarsi Tolstaja e Čertkov per quasi tre decenni; dall’altra, il processo di formazione dell’archivio viene esaminato alla luce del controverso rapporto di Tolstoj con Čertkov e soprattutto del dilemma interno alla coscienza dello scrittore stesso, scisso tra la ricerca di uno spazio privato e inaccessibile e l’ambizione a conquistare il «diritto a una biografia».The Author investigates the case of the archive of Lev Tolstoy, now stored at the State Museum "Lev Tolstoy" in Moscow, with particular attention to the meaning that the private-public dialectic assumed in the history of its creation. In fact, the problem of the storage of Tolstoy's writings immediately assumed the appearance of a conflict between the private and public dimensions, represented respectively by the two producers of the archive: Tolstoy's wife, S. A. Tolstaja, and the friend V. G. Chertkov. In the article, on the one hand, we trace the salient phases of the war for the possession of the manuscripts that saw Tolstaja and Chertkov facing each other for almost three decades; on the other, the process of formation of the archive is examined in light of the controversial relationship between Tolstoy and Chertkov, and above all of the dilemma inside the writer's own conscience, split between the search for a private and inaccessible space and the ambition to conquer the «right to a biography»
СВОБОДНЫЕ КОММУТАТИВНЫЕ g-ДИМОНОИДЫ
No full textA dialgebra is a vector space equipped with two binary operations ⊣ and ⊢ satisfying the following axioms: (D1) (x ⊣ y) ⊣ z = x ⊣ (y ⊣ z), (D2) (x ⊣ y) ⊣ z = x ⊣ (y ⊢ z), (D3) (x ⊢ y) ⊣ z = x ⊢ (y ⊣ z), (D4) (x ⊣ y) ⊢ z = x ⊢ (y ⊢ z), (D5) (x ⊢ y) ⊢ z = x ⊢ (y ⊢ z). This notion was introduced by Loday while studying periodicity phenomena in algebraic K-theory. Leibniz algebras are a non-commutative variation of Lie algebras and dialgebras are a variation of associative algebras. Recall that any associative algebra gives rise to a Lie algebra by [x, y] = xy−yx. Dialgebras are related to Leibniz algebras in a way similar to the relationship between associative algebras and Lie algebras. A dialgebra is just a linear analog of a dimonoid. If operations of a dimonoid coincide, the dimonoid becomes a semigroup. So, dimonoids are a generalization of semigroups. Pozhidaev and Kolesnikov considered the notion of a 0-dialgebra, that is, a vector space equipped with two binary operations ⊣ and ⊢ satisfying the axioms (D2) and (D4). This notion have relationships with Rota-Baxter algebras, namely, the structure of Rota-Baxter algebras appearing on 0-dialgebras is known. The notion of an associative 0-dialgebra, that is, a 0-dialgebra with two binary operations ⊣ and ⊢ satisfying the axioms (D1) and (D5), is a linear analog of the notion of a g-dimonoid. In order to obtain a g-dimonoid, we should omit the axiom (D3) of inner associativity in the definition of a dimonoid. Axioms of a dimonoid and of a g-dimonoid appear in defining identities of trialgebras and of trioids introduced by Loday and Ronco. The class of all g-dimonoids forms a variety. In the paper of the second author the structure of free g-dimonoids and free n-nilpotent g-dimonoids was given. The class of all commutative g-dimonoids, that is, g-dimonoids with commutative operations, forms a subvariety of the variety of g-dimonoids. The free dimonoid in the variety of commutative dimonoids was constructed in the paper of the first author. In this paper we construct a free commutative g-dimonoid and describe the least commutative congruence on a free g-dimonoid. Диалгеброй называется векторное пространство, снабжённое двумя би- нарными операциями ⊣ и ⊢, удовлетворяющими следующим аксиомам: (D1) (x ⊣ y) ⊣ z = x ⊣ (y ⊣ z), (D2) (x ⊣ y) ⊣ z = x ⊣ (y ⊢ z), (D3) (x ⊢ y) ⊣ z = x ⊢ (y ⊣ z), (D4) (x ⊣ y) ⊢ z = x ⊢ (y ⊢ z), (D5) (x ⊢ y) ⊢ z = x ⊢ (y ⊢ z). Это понятие было введено Лодэ во время изучения феномена периодичности в алгебраической K-теории. Алгебры Лейбница являются некоммутативной версией алгебр Ли, а диалгебры – версией ассоциативных ал- гебр. Напомним, что любая ассоциативная алгебра даёт алгебру Ли, если положить [x, y] = xy −yx. Диалгебры связаны с алгебрами Лейбница аналогично тому как связаны между собой ассоциативные алгебры и алгебры Ли. Диалгебра является линейным аналогом димоноида. Если операции димоноида совпадают, то он превращается в полугруппу. Таким образом, димоноиды обобщают полугруппы. Пожидаев и Колесников рассмотрели понятие 0-диалгебры, то есть векторного пространства, снабжённого двумя бинарными операциями ⊣ и ⊢, удовлетворяющими аксиомам (D2) и (D4). Это понятие имеет связи с алгебрами Рота-Бакстера, а именно известна структура алгебр Рота- Бакстера, возникающих на 0-диалгебрах. Понятие ассоциативной 0-диалгебры, то есть 0-диалгебры с двумя бинарными операциями ⊣ и ⊢, удовлетворяющими аксиомам (D1) и (D5), является линейным аналогом понятия g-димоноида. Для того, чтобы получить g-димоноид, мы должны опустить аксиому (D3) внутренней ассоциативности в определении димоноида. Аксиомы димоноида и g-димоноида появляются в тождествах триалгебр и триоидов, введенных Лодэ и Ронко. Класс всех g-димоноидов образует многообразие. Строение свободных g-димоноидов и свободных n-нильпотентных g-димоноидов было описано в статье второго автора. Класс всех коммутативных g-димоноидов, то есть g-димоноидов с коммутативными операциями, образует подмногообразие многообразия g-димоноидов. Свободный димоноид в многообразии коммутативных димоноидов был построен в статье первого автора. В этой статье мы строим свободный коммутативный g-димоноид, а также описываем наименьшую коммутативную конгруэнцию на свободном g-димоноиде.
A unified mechanistic model of niche, neutrality and violation of the competitive exclusion principle
No full textThe origin of species richness is one of the most widely discussed questions in ecology. The absence of unified mechanistic model of competition makes difficult our deep understanding of this subject. Here we show such a two-species competition model that unifies (i) a mechanistic niche model, (ii) a mechanistic neutral (null) model and (iii) a mechanistic violation of the competitive exclusion principle. Our model is an individual-based cellular automaton. We demonstrate how two trophically identical and aggressively propagating species can stably coexist in one stable homogeneous habitat without any trade-offs in spite of their 10% difference in fitness. Competitive exclusion occurs if the fitness difference is significant (approximately more than 30%). If the species have one and the same fitness they stably coexist and have similar numbers. We conclude that this model shows diffusion-like and half-soliton-like mechanisms of interactions of colliding population waves. The revealed mechanisms eliminate the existing contradictions between ideas of niche, neutrality and cases of violation of the competitive exclusion principle
Mixed-Anion [AsF<sub>6</sub>]<sup>−</sup>/[SbF<sub>6</sub>]<sup>−</sup> Salts of Cs<sup>+</sup> and [XeF<sub>5</sub>]<sup>+</sup>; Incommensurately Modulated Crystal Structures of [XeF<sub>5</sub>][As<sub>1‑x</sub>Sb<sub><i>x</i></sub>F<sub>6</sub>] (<i>x</i> ≈ 0.5 and 0.7)
No full textCrystallizations
of CsAsF6/CsSbF6 were carried
out in anhydrous hydrogen fluoride (aHF) at various molar ratios.
The compositions of the grown single crystals as refined from the
X-ray diffraction data correspond to Cs[As1‑xSbxF6] (x = 0.13–0.87), which means that most probably all phases with x = 0–1 exist. They crystallize in the trigonal R 3̅ space group (no. 147). As5+ and Sb5+ are randomly distributed on the same crystallographic site.
Crystal growth from aHF solutions of dissolved [XeF5][AsF6] and [XeF5][SbF6] mixtures in different
initial ratios resulted in single crystals of [XeF5][As1‑xSbxF6] (x ≈ 0.3 and 0.7) salts. The [XeF5][As0.5Sb0.5F6] crystallizes
in two crystal modifications at low (α-phase, T T > 180
K)
temperatures. α-[XeF5][As0.5Sb0.5F6] is orthorhombic with space group Pca21 (no. 29). Orthorhombic [XeF5][As0.3Sb0.7F6] (100–295 K) and β-[XeF5][As0.5Sb0.5F6] adopt a (3
+ 1)-dimensionally incommensurately modulated crystal structure (superspace
group Ama2(00g)s0s). Crystal data of [XeF5][As0.3Sb0.7F6]: a = 10.031(1) Å, b = 13.362(1) Å, c = 11.808(1) Å, V = 1582.9(5) Å3, modulation wavevector q = 0.6672c*, and Z = 8 at 200 K. Unit cell parameters
of β-[XeF5][As0.5Sb0.5F6] at 295 K: a = 10.1196(5) Å, b = 13.4517(6) Å, c = 11.8999(5) Å, V = 1619.8(2)Å3, modulation wavevector q = 0.6519c*, and Z =
8
- …
