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Investigation of Structural and Thermoelectric Properties of Bismuth Selenide Thin Films 硒化铋薄膜的结构与热电性能研究
IF 0.9 4区 数学 Q2 Mathematics Pub Date : 2021-02-24 DOI: 10.2174/1877946810999200831101239
H. Sharma, Y. Sharma
Thermoelectric material with high performance and low cost isthe basic need of today. Bismuth selenide is a thermoelectric material. A set of bismuthselenide thin films having different stoichiometry ratios varying Bi/Se ratio from 0.123 to0.309 have been prepared.The present work deals with the synthesis and characterization of various thinfilms of bismuth selenide. The thermoelectric properties of thin films were also investigated.The aim of this work is to investigate the effect of composition ratio on the structuraland thermoelectric properties and to find out the best stoichiometry ratio of bismuth selenidethin films that can be used in the application of thermoelectric devices.A set of bismuth selenide thin films having different elemental compositionswere prepared by employing the thermal evaporation technique. The crystal structure andelemental composition of thin films were investigated by XRD and EDAX, respectively.The roughness of films was analyzed by AFM. The thermoelectric properties of variousthin films were also measured.XRD spectrum confirms the formation of phases formed in thin films whichslightly matched with standard data. AFM results indicated that the surface of films wassmooth and nanoparticles were generated on the surface. AFM results indicated that thesurfaces of annealed thin films were smoother than as-deposited thin films. Seebeck coefficientwas found negative throughout the temperature range. The power factor was alsocalculated by the Seebeck coefficient and results revealed the effect of composition ratioon Seebeck coefficient, electrical conductivity, and power factor. Thin films having acomposition ratio of 0.182 exhibited the highest power factor.This study provides relevant basic information on the thermoelectric propertyof thin films, as well as presents the effect of compositional variation on thermoelectricmeasurements. From the application point of view in the thermoelectric devices, the beststoichiometric thin films out of four prepared thin films have been presented.
高性能、低成本的热电材料是当今的基本需求。硒化铋是一种热电材料。制备了Bi/Se比值为0.123 ~ 0.309的不同化学计量比的铋薄膜。本文研究了各种硒化铋薄膜的合成和表征。研究了薄膜的热电性能。本文的目的是研究硒化铋薄膜的组成比对其结构和热电性能的影响,并找出可用于热电器件的硒化铋薄膜的最佳化学计量比。采用热蒸发技术制备了一套元素组成不同的硒化铋薄膜。采用XRD和EDAX分析了薄膜的晶体结构和元素组成。采用原子力显微镜对膜的粗糙度进行了分析。测量了不同薄膜的热电性能。XRD谱图证实薄膜中形成的相与标准数据略有匹配。AFM结果表明,薄膜表面光滑,表面产生了纳米颗粒。AFM结果表明,退火薄膜的表面比沉积薄膜光滑。塞贝克系数在整个温度范围内均为负。用塞贝克系数计算了功率因数,结果揭示了塞贝克系数、电导率和功率因数对组成比的影响。薄膜的组成比为0.182时,其功率因数最高。本研究提供了薄膜热电性能的相关基本信息,并提出了成分变化对热电测量的影响。从热电器件的应用角度出发,给出了四种制备薄膜中化学计量性能最好的一种。
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引用次数: 0
Brownian bridge expansions for Lévy area approximations and particular values of the Riemann zeta function lsamvy面积近似的布朗桥展开式和Riemann zeta函数的特殊值
IF 0.9 4区 数学 Q2 Mathematics Pub Date : 2021-02-19 DOI: 10.1017/S096354832200030X
James Foster, Karen Habermann
We study approximations for the Lévy area of Brownian motion which are based on the Fourier series expansion and a polynomial expansion of the associated Brownian bridge. Comparing the asymptotic convergence rates of the Lévy area approximations, we see that the approximation resulting from the polynomial expansion of the Brownian bridge is more accurate than the Kloeden–Platen–Wright approximation, whilst still only using independent normal random vectors. We then link the asymptotic convergence rates of these approximations to the limiting fluctuations for the corresponding series expansions of the Brownian bridge. Moreover, and of interest in its own right, the analysis we use to identify the fluctuation processes for the Karhunen–Loève and Fourier series expansions of the Brownian bridge is extended to give a stand-alone derivation of the values of the Riemann zeta function at even positive integers.
本文研究了基于傅里叶级数展开式和相关布朗桥的多项式展开式的布朗运动lvmy面积的近似。比较lsamvy面积近似的渐近收敛速率,我们看到由布朗桥的多项式展开产生的近似比Kloeden-Platen-Wright近似更精确,同时仍然只使用独立的正态随机向量。然后我们将这些近似的渐近收敛率与相应的布朗桥级数展开式的极限涨落联系起来。此外,我们用于识别布朗桥的karhunen - lo和傅立叶级数展开式的波动过程的分析本身也很有趣,我们对其进行了扩展,以给出偶数正整数处黎曼ζ函数值的独立推导。
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引用次数: 9
The chromatic profile of locally colourable graphs 局部可着色图的彩色轮廓
IF 0.9 4区 数学 Q2 Mathematics Pub Date : 2021-02-10 DOI: 10.1017/S0963548322000050
Freddie Illingworth
The classical Andrásfai-Erdős-Sós theorem considers the chromatic number of $K_{r + 1}$ -free graphs with large minimum degree, and in the case, $r = 2$ says that any n-vertex triangle-free graph with minimum degree greater than $2/5 cdot n$ is bipartite. This began the study of the chromatic profile of triangle-free graphs: for each k, what minimum degree guarantees that a triangle-free graph is k-colourable? The chromatic profile has been extensively studied and was finally determined by Brandt and Thomassé. Triangle-free graphs are exactly those in which each neighbourhood is one-colourable. As a natural variant, Luczak and Thomassé introduced the notion of a locally bipartite graph in which each neighbourhood is 2-colourable. Here we study the chromatic profile of the family of graphs in which every neighbourhood is b-colourable (locally b-partite graphs) as well as the family where the common neighbourhood of every a-clique is b-colourable. Our results include the chromatic thresholds of these families (extending a result of Allen, Böttcher, Griffiths, Kohayakawa and Morris) as well as showing that every n-vertex locally b-partite graph with minimum degree greater than $(1 - 1/(b + 1/7)) cdot n$ is $(b + 1)$ -colourable. Understanding these locally colourable graphs is crucial for extending the Andrásfai-Erdős-Sós theorem to non-complete graphs, which we develop elsewhere.
经典的Andrásfai-Erdős-Sós定理考虑了具有大最小度的$K_{r + 1}$自由图的色数,在这种情况下,$r = 2$表示任何最小度大于$2/5 cdot n$的n顶点无三角形图是二部图。这开始了对无三角形图的彩色轮廓的研究:对于每k,保证无三角形图可k色的最小度是多少?人们对彩色轮廓进行了广泛的研究,并最终由勃兰特和托马斯·索瑟尔确定。无三角形图就是那些每个邻域都是单色的图。作为一个自然的变体,Luczak和thomass引入了局部二部图的概念,其中每个邻域都是2色的。本文研究了每个邻域都是b可色的图族(局部b部图)和每个a团的公共邻域都是b可色的图族的色轮廓。我们的结果包括这些族的色阈值(扩展了Allen, Böttcher, Griffiths, Kohayakawa和Morris的结果),并表明每个最小度大于$(1 - 1/(b + 1/7)) cdot n$的n顶点局部b-部图$(b + 1)$ -可着色。理解这些局部可着色图对于将Andrásfai-Erdős-Sós定理扩展到我们在其他地方开发的非完全图是至关重要的。
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引用次数: 2
On deficiency problems for graphs 关于图的不足性问题
IF 0.9 4区 数学 Q2 Mathematics Pub Date : 2021-02-08 DOI: 10.1017/s0963548321000389
Andrea Freschi, Joseph Hyde, Andrew Treglown
Motivated by analogous questions in the setting of Steiner triple systems and Latin squares, Nenadov, Sudakov and Wagner [Completion and deficiency problems, Journal of Combinatorial Theory Series B, 2020] recently introduced the notion of graph deficiency. Given a global spanning property $mathcal P$ and a graph $G$ , the deficiency $text{def}(G)$ of the graph $G$ with respect to the property $mathcal P$ is the smallest non-negative integer t such that the join $G*K_t$ has property $mathcal P$ . In particular, Nenadov, Sudakov and Wagner raised the question of determining how many edges an n-vertex graph $G$ needs to ensure
受Steiner三重系统和拉丁平方设置中的类似问题的启发,Nenadov, Sudakov和Wagner[补全和缺陷问题,Journal of Combinatorial Theory Series B, 2020]最近引入了图缺陷的概念。给定一个全局生成属性$mathcal P$和一个图$G$,图$G$相对于属性$mathcal P$的缺陷$text{def}(G)$是最小的非负整数t,使得连接$G*K_t$具有属性$mathcal P$。特别是,Nenadov, Sudakov和Wagner提出了一个问题,确定一个n顶点图$G$需要多少条边来确保$G*K_t$包含一个$K_r$ -因子(对于任何固定的$rgeq 3$)。本文全面解决了这一问题。我们还给出了一个类似的结果,即强制$G*K_t$包含任何有界度和小带宽的固定二部$(n+t)$ -顶点图。
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引用次数: 0
Tradução das Bucólicas, de Virgílio: Écloga I 维吉尔《布科利纳斯》的翻译:结语一
IF 0.9 4区 数学 Q2 Mathematics Pub Date : 2021-02-06 DOI: 10.17074/CPC.V1I39.34782
P. Barbieri
Apresento uma traducao poetica da primeira ecloga das Bucolicas , de Virgilio, tomando por base o texto da OCT, editado por Mynors (1972). Teco ainda alguns comentarios preliminares acerca das minhas escolhas tradutologicas.
我根据Mynors(1972)编辑的OCT文本,对Virgilio的《Bucolias的第一次孵化》进行了诗意翻译。我也对我的翻译选择做了一些初步的评论。
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引用次数: 0
Композиционные материалы, упрочненные с углеродными нанотрубками и их применение в пиротехнических замедлительных смесях 碳纳米管强化复合材料及其在烟火慢化混合物中的应用
IF 0.9 4区 数学 Q2 Mathematics Pub Date : 2021-02-02 DOI: 10.18321/CPC381
Ш.Е. Габдрашова, М. И. Тулепов, Г.А. Спанова, М. А. Корчагин, B. Elouadi
Был разработан замедлительный пиротехнический состав на основе модифицированных компонентов. Ti и углеродные нанотрубки были смешаны методом шаровой мельницы. Анализ размера частиц показал, что размер частиц экспоненциально уменьшился с увеличением времени измельчения. Результаты сканирующей электронной микроскопии показали, что углеродные нанотрубки были рассеяны в титановом порошке после 2 минут мехактивации. Ti/углеродные нанотрубки были использованы в качестве горючего замедлительного состава. Мы изучали скорость горения замедлительного состава BaCrO4/углеродные нанотрубки/Тi. Установлено, что определенное количество углеродных нанотрубок добавленного к замедлительному составу, может увеличить точность задержки.
一种基于改良成分的延缓烟火化合物被开发出来。Ti和碳纳米管是由球磨机混合而成的。对粒子大小的分析表明,随着时间的增加,粒子的大小呈指数级下降。扫描电子显微镜显示,碳纳米管在两分钟后被释放到钛粉中。Ti/碳纳米管被用作燃料和延缓剂。我们研究了BaCrO4/碳纳米管/ ti燃烧速率。事实证明,在减速器中加入一定数量的碳纳米管可能会增加延迟的精度。
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引用次数: 0
INCESTO, TORTURA E SILÊNCIO: UM CASO DE FAMÍLIA NA DECLAMAÇÃO MAIOR 18, DE PSEUDO-QUINTILIANO 乱伦、酷刑和沉默:伪昆提利亚诺的《主要宣言》第18章中的一个家庭案例
IF 0.9 4区 数学 Q2 Mathematics Pub Date : 2021-01-27 DOI: 10.17074/CPC.V1I39.35839
Ana Clara Borro Lopes, Charlene Martins Miotti
O presente artigo propoe a traducao em portugues brasileiro da Declamacao Maior 18, sobre a acusacao de uma mae ante o silencio do marido em relacao a tortura e assassinato do filho unico, suspeito de incesto. E o penultimo texto do compendio das Declamacoes Maiores , atribuidas a Pseudo-Quintiliano, e antecede a defesa do pai, desenvolvida na decima nona, e ultima, declamacao. Alem da traducao do texto latino, abordam-se brevemente problemas de autoria e atribuicao desse conjunto de textos ao retor Marco Fabio Quintiliano (c. 30-96 EC), a construcao do genero literario declamatorio, suas relacoes com o universo mitologico romano, sua relevância para a formacao retorica dos jovens, alem de recursos de estilo mais proeminentes no discurso.
这篇文章提出了第18篇主要宣言的巴西葡萄牙语翻译,该宣言指控一位母亲在她的丈夫对她唯一的儿子被怀疑乱伦的酷刑和谋杀保持沉默之前。这是《主要宣言纲要》的倒数第二篇,被认为是伪昆提利安的作品,在第十九篇也是最后一篇《宣言》中发展起来的《父亲的辩护》之前。除了拉丁文本的翻译,作者表达的问题,他很快就和任务的一系列文字retor马可》昆提利安法比奥(c . -96阿雷格里港),文学的构造是什么样declamatorio宇宙mitologico罗马人,他们的关系,修辞训练年轻人的关系,除了资源的最著名的演说。
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引用次数: 0
Tacitus and C. Licinius Mucianus 塔西佗和C.李锡尼
IF 0.9 4区 数学 Q2 Mathematics Pub Date : 2021-01-27 DOI: 10.17074/CPC.V1I39.34563
W. Altman
Resumo:  Baseando-se nas ideias de Ronald Syme sobre a simpatia de Tacito por Marcelo Eprio, assim como no trabalho de Dylan Sailor, que revela a postura critica do historiador em relacao a Helvidio Prisco, este artigo mostra por que a descricao de Muciano e importante tanto para combinar quanto para confirmar essas duas vertentes interpretativas. Apresentado como “criador de reis” a Vespasiano, Muciano – ou melhor, o retrato que Tacito faz dele – revela-se um guia crucial, embora negligenciado, para os metodos e as simpatias do historiador cuja carreira dependia da Dinastia Flaviana e que decidiu contar seus feitos em suas  Historias.
摘要:罗纳德姆的想法基于同情的Tacito马塞洛Eprio,迪伦·邓恩在工作一样,显示了对历史学家的批评立场Helvidio遗体,这篇文章显示了描述为什么Muciano和重要的安排和确认这两个方面转化。作为维斯帕先的“国王的创造者”,穆西亚努斯——或者更确切地说,塔西佗对他的描述——被证明是这位历史学家的方法和同情的一个至关重要的指南,尽管被忽视了,这位历史学家的职业生涯依赖于弗拉维王朝,并决定在他的历史中讲述他的成就。
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引用次数: 0
A CONSTRUÇÃO DA PERSONA SATÍRICA NAS SÁTIRAS DE PÉRSIO 健康人身安全建设
IF 0.9 4区 数学 Q2 Mathematics Pub Date : 2021-01-27 DOI: 10.17074/CPC.V2I38.31810
Ruth Santos Fontes Silva, L. Leite
O presente artigo analisa a construcao da persona satirica na obra do poeta romano Aulo Persio Flaco. Nossa analise utiliza o conceito de persona a partir dos estudos de Paulo Sergio de Vasconcellos (2016) e Diskin Clay (1998), em que os estudiosos propoem a distincao entre a persona poetica e o autor empirico frente a leitura dos textos literarios que, por vezes, sao tomados pelo vies autobiografico. Alem disso, utilizamos o conceito de ethos proposto por Dominique Maingueneau, que considera que todo texto escrito possui um tom que confere autoridade ao que e dito e permite ao leitor a construcao da representacao de quem escreve. Desse modo, percebemos que a construcao da persona satirica de Persio, nas satiras em questao, apresenta um ethos conservador que se excede nos vulgarismos para criticar a sociedade romana e seus padroes, contrario a literatura contemporânea e ao helenismo, avesso ao apego material e defensor dos estudos da filosofia estoica.
本文分析了罗马诗人弗拉科作品中讽刺人物形象的建构。我们的分析使用了Paulo Sergio de Vasconcellos(2016)和Diskin Clay(1998)研究中的人物角色概念,在这些研究中,学者们提出了面对阅读有时带有自传体偏见的文学文本时,诗歌人物角色和经验主义作者之间的区别。此外,我们使用了Dominique Maingueneau提出的精神气质概念,他认为每一篇书面文本都有一种语气,赋予所说内容以权威,并允许读者构建谁写作的表征。因此,我们意识到,在所讨论的讽刺作品中,波斯讽刺人物形象的构建呈现出一种超越庸俗的保守精神,与当代文学和希腊主义相反,反对物质依恋,是斯多葛哲学研究的捍卫者。
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引用次数: 0
A decapitação de Holofernes e as revoltas dos Macabeus: tradução alipogramática do Livro IX da De aetatibus mundi et hominis de Fulgêncio, o Mitógrafo 霍洛弗内斯的斩首和马加比起义:神话学家富尔根提乌斯的《世界与人》第九卷的阿里波语法翻译
IF 0.9 4区 数学 Q2 Mathematics Pub Date : 2021-01-27 DOI: 10.17074/CPC.V1I39.34543
Cristóvão José dos Santos Júnior
Neste trabalho, realiza-se a primeira traducao alipogramatica para a lingua portuguesa do Livro IX da obra De aetatibus mundi et hominis , considerada o mais antigo lipograma que o passado nos legou. Esse escrito e atribuido ao compositor africano e tardio Fulgencio, o Mitografo, que teria vivido entre os seculos V e VI d.C. A  De aetatibus  encerra uma constricao linguistica de carater consecutivo, de modo que, em cada uma de suas 14 secoes, e evitada uma determinada letra. No nono Livro, ora traduzido, Fulgencio apresenta personagens como Jezabel, Manasses, Nabucodonosor, Nebuzarada e Mordecai, fazendo referencia a algumas narrativas cristas, com destaque para o episodio da decapitacao de Holofernes por Judite. Ocorre que Fulgencio, visando a empreender seu lipograma, nao emprega unidades lexicais que apresentem o grafema ‘i’, que e exatamente a oitava letra de seu alfabeto. Note-se, por fim, que esse feito nao foi cultivado no texto de chegada, na medida em que, neste momento, busca-se fornecer uma traducao que propicie um acesso mais fluido ao conteudo tematico do texto latino.
在这项工作中,我们对De aetatibus mundi et hominis的第九本书进行了第一次葡萄牙语程序翻译,该书被认为是过去留给我们的最古老的脂肪图。这篇作品归功于已故的非洲作曲家有丝分裂者富尔根西奥,他可能生活在公元5世纪至6世纪之间。De aetatibus包含了连续字符的语言限制,因此在其14个部分中的每一个部分都避免了某个字母。在现已翻译的第九本书中,富尔根西奥介绍了耶洗别、玛纳斯、尼布甲尼撒、尼布扎拉达和末底改等人物,并引用了一些基督教叙事,尤其是朱迪思斩首荷洛弗内斯的情节。碰巧富尔根西奥的目的是进行他的字母图,他没有使用表示字形“i”的词汇单位,这正是他的字母表中的第八个字母。最后,应该指出的是,目标文本中没有培养这一成就,因为目前,我们正在寻求提供一个翻译,以便更灵活地了解拉丁文本的主题内容。
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引用次数: 0
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Combinatorics, Probability & Computing
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