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Mixed phase sodium manganese oxide as cathode for enhanced aqueous zinc-ion storage

Chinese Journal of Chemical Engineering 2020年第8期28卷 2214-2220页

作者： Xinyu Wang Xinghua Qin Qiongqiong Lu Mingming Han Ahmad Omar daria Mikhailova Institute of Materials and Technology Dalian Maritime UniversityDalian 116026China Leibniz Institute for Solid State and Materials Research(IFW)Dresden e.V. Helmholtzstraße 2001069 DresdenGermany School of Materials Science and Engineering Central South UniversityChangsha 410083China

Aqueous zinc-ion batteries have been regarded as a promising alternative to large-scale energy storage, due to associated low-cost, improved safety and environmental friendliness. However, a high-performance cathode material for both rate capability and specific capacity is still a challenge. One kind of the more promising candidates are sodium manganese oxide(NMO) materials, although they suffer from individual issues and need to be further improved. Herein, we present a novel mixed phase NMO material composed of nearly equal amounts of Na(0.55)Mn2O4 and Na(0.7)MnO(2.05). The structured configuration with particle size of 200–500 nm is found to be beneficial towards improving the ion diffusion rate during the charge/discharge process. Compared with Na(0.7)MnO(2.05) and Na(0.55)Mn2O4, the mixed phase NMO demonstrates an enhanced rate capability and excellent long-term cycling stability with a capacity retention of 83% after 800 cycles. More importantly, the system also delivers an impressive energy density and power density, as 378 W·h·kg^-1 at 68.7 W·kg^-1, or 172 W·h·kg^-1 at 1705 W·kg^-1. The superior electrochemical performance is ascribed to the fast Zn^2+ diffusion rate because of a large ratio of capacitive contribution(63.9% at 0.9 m V·s^-1). Thus, the mixed phase route provides a novel strategy to enhance electrochemical performance, enabling mixed phase NMO as very promising material towards large-scale energy-storage applications.

关键词： Aqueous zinc-ion battery Sodium manganese oxide Mixed phase High energy density

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The Application of Web-based Content Analysis in Rganizational Culture Research:An External Analysis of Enterprises in Video Gaming Industry

The Application of Web-based Content Analysis in Rganization...

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作者： Chevanina daria 华中师范大学

学位级别：硕士

Scholars in the organizational culture domain were striving for several decades to create the most reliable tool for quantitative assessment of organizational *** the "paradigm wars" in the 80s',researchers proposed multiple tools and scales for assessing organizational *** several frameworks were accepted by the majority of scholars as adequate methods,they still possess certain *** content analytic exploratory study aims to propose a new approach to organizational culture research by combining a very classical method--Organizational Culture Profile instrument-and web-based content *** transforming OCP values set to a coding scheme and implementing it for analysis of video game industry online job advertisements was discovered that,this approach will allow to explore organizational culture values using external *** study introduces new approach of using classical culture assessment instrument which creating opportunities for further research.

关键词： Organizational culture OCP web-based content analysis

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Internalization Startegy,Conduct and Perfomance: The Case of Prada Group in China and Russia

Internalization Startegy,Conduct and Perfomance: The Case of...

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作者： Zonova daria 浙江工商大学

学位级别：硕士

At present,internationalization is becoming an increasingly important and significant *** before have had the economies of different countries affected each other in this way: most of the companies are trying to expand their field of activity and go beyond the domestic market,mastering more extensive areas and following the trends of the constantly changing global *** paper will explore the process of expanding an international company,especially all the main steps and challenges associated with completing the internationalization process that any company entering the international market may face with the focus on the luxury segment of the fashion *** research aim of the thesis is defined as follows: to analyze the efficiency of traditional internationalization strategies and their applicability for high-fashion retailers with the help of empirical research and the case study of PRADA group international expansion into Chinese and Russian *** the help of theoretical material,the concept of internationalization,its main models,the tactics of their application and the motives of the company's entry into the international market were *** key elements of the internationalization strategy process were identified and in detail *** the review of the main internalization patterns specific for retailers in fashion industry,it became obvious that some traditional theoretical approaches are not quite suitable for this *** the end of the research useful considerations and suggestions about the theoretical framework of internalization process within the fashion context were introduced.

关键词： internalization strategy Uppsala model Born-Globals fashion retailers luxury fashion market e-coomerce

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Risk Identification and Assessment for Construction Public-Private Partnership Project of Russia "East-West Highway Diameter"

Risk Identification and Assessment for Construction Public-P...

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作者： Kuznetsova daria 山东大学

学位级别：硕士

Public-private partnerships（PPPs）as a form of cooperation for large-scale projects and for the provision of public services through the involvement of the private sector are widely used in both developed and developing ***,the implementation of public-private partnership projects is more challenging as it encounters unique local contexts and *** study is aimed to study the public-private partnership,considering the practice of Project risk management in accordance with the features of Public-private partnership in *** investigate these issues,in this study methods of qualitative and quantitative analysis are used to analyze the theoretical concepts with their further *** objectives of this study,based on extant literature,were to determine the main features of Public-private partnership development in Russia,risk factors and their allocation for construction *** methods are used for data collection and *** accordance with this,the study has conducted the questionnaire with the employees of the Russian projects in order to obtain an expert assessment of each possible risks and their impact on the *** finding was further validated by an analysis of how risks can be managed in *** achieve this,a review of a number of empirical studies including case study was *** "East-West Highway Diameter" project was used to test the efficiency of Risk assessment methods and tools in *** results obtained from the case study were analyzed and compared with the best international practices deduced from the literature *** significance of the work is determined by the conclusions and recommendations on the development of methods to estimate and control the main risks during the implementation of public-private partnership project in Russia,which can be used by government agencies and non-profit *** proposed risk decision-making model would be a useful tool to efficient

关键词： public-private partnership risk assessment risk identification Russia

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Three-dimensional crystal plasticity and HR-EBSD analysis of the local stress-strain fields induced during twin propagation and thickening in magnesium alloys

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Journal of Magnesium and Alloys 2023年第2期11卷 657-670页

作者： Filip Siska daria Drozdenko Kristian Mathis Jan Cizek Tingting Guo Matthew Barnett Institute of Physics of Materials The Czech Academy of SciencesZizkova 513/22Brno 61662Czech Republic Department of Physics of Materials Faculty of Mathematics and PhysicsCharles UniversityKe Karlovu 5Prague 12116Czech Republic Institute of Plasma Physics The Czech Academy of SciencesZa Slovankou 1782/3Prague 18200Czech Republic Institute for Frontier Materials Deakin UniversityGeelongVictoria 3216Australia

Present work focuses on analysis of the stress and strain fields inside and around the individual {10–12} twin in magnesium alloy. The 3D crystal plasticity model represents twin as an ellipsoidal inclusion surrounded by the matrix. Five different twin thicknesses and three different lateral twin lengths are used for stress/strain analysis. The simulations are complemented with experimental observations using high-resolution electron backscattered diffraction. The simulations and experiments show a similar distribution of the shear stress and the spatial activity of individual slip systems(basal, prismatic, pyramidal). Plasticity induced inside the twin is dominantly caused by the prismatic dislocations slip and does not influence twin back stress which is identical to pure elastic twin. The twin with larger lateral dimension requires lower equilibrium stress which suggests anisotropic twin propagation and increased thickness of such twins. The lateral twin propagation is mostly influenced by prismatic and pyramidal slip in the twin vicinity. The twin thickness can reach a maximal level that is driven by the critical resolved shear stress values for dislocation slip with the significant influence of basal slip.

关键词： Magnesium alloy Twinning FEM Crystal plasticity HR-EBSD

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Grinding exfoliation for scalable production of 2D materials

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National Science Review 2020年第3期7卷 559-560页

作者： Kostya S.Novoselov Qi Ge daria V.ANDreeva Department of Materials Science and Engineering National University of Singapore National Graphene Institute University of Manchester

Over the past few years the utilisation of graphene in various areas of industry has strongly intensified [1]. Applications in thermal management, composite materials and energy consume an increasing amount of this tw... 详细信息

关键词： Grinding exfoliation for scalable production of 2D materials Graphene

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Root structure syndromes of four families of monocots in the Middle Urals

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Plant Diversity 2023年第6期45卷 722-731页

作者： Anna A.Betekhtina daria E.Tukova Denis V.Veselkin Ural Federal University Named After the First President of Russia B.N.Yeltsin 19 Mira StreetEkaterinburg 620002Russia Ural Branch of the Russian Academy of Sciences Institute of Plant and Animal Ecology8 Marta StreetEkaterinburg 620144Russia

The present article tests the following general assumption:plant taxa with different specializations towards mycorrhizal interactions should have different root *** of 61 species common in boreal zone were studied:16 species of Poaceae,24 species of Cyperaceae,14 species of Orchidaceae,and 7 species of *** a fixed material of 5 individuals of each species,the following was determined:number of orders of branching roots;transverse dimensions of root,stele and cortex;number of primary xylem vessels and exodermis layers;length of root hairs;abundance of *** of each family had well-defined *** of Orchidaceae and Iridaceae were thick with a large stele and developed *** had no branching roots and had long root *** Iridaceae,roots were branched,and root hairs were *** of Poaceae and Cyperaceae were thin with a relatively thin *** hairs were short in Poaceae and long in *** finding that root syndromes of four families of monocots differed is a new and unexpected *** high specificity of root syndromes in Cyperaceae,Iridaceae,Poaceae,and Orchidaceae indicates that species of these families use different strategies to obtain water and soil nutrients.

关键词： Monocots Poaceae Cyperaceae Orchidaceae Iridaceae Syndromes of roots structure

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Infinite Frobenius Groups Generated by Elements of Order 3

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Algebra Colloquium 2020年第4期27卷 741-748页

作者： Nanying Yang daria Vic to rovna Lytkina Victor Danilovich Mazurov Archil Khazeshovich Zhurtov School of Science Jiangnan UniversityWuxiJiangsu 214122China Siberian State University of Telecommunications and Information Sciences 630102 Kirova 86NovosibirskRussia Sobolev Institute of Mathematics SB RAS630090 Pr.Ak.Koptjug 4NovosibirskRussia Kabardino-Balkarian State University ul.Chernyshevskogo 173 Nalchik360004Kabardino-BalkariyaRussia

A semidirect product G=F⋋H of groups F and H is called a Frobenius group if the following two conditions are satisfied:(F1)H acts freely on F,that is,fh=f for f in F and h in H only if^(h)=1 or f=1.(F2)Every non-identity element h∈H of finite order n induces in F by conjugation in G a splitting automorphism,that is,ff^(h)⋯fh^(n−1)=1 for every f∈F;in other words,the order of f^(h−1)is equal to *** describe the normal structure of a Frobenius group with periodic subgroup H generated by elements of order 3.

关键词： Frobenius group splitting automorphism character table

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Evidence for a con served microbiota across the different developmental stages of Plodia interpunctella

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Insect Science 2019年第3期26卷 466-478页

作者： Valeria Mereghetti Bessem Chouaia Lidia Limonta daria Patrizia Locatelli Matteo Montagna Dipartimento di Scienze Agrarie e Ambientali Universita degli Studi di Milano Milan Italy Dipartimento di Scienze per gli Alimenti la Nutrizione I'Ambiente Universita degli Studi di Milano Milan Italy

Diversity and composition of lepidopteran microbiotas are poorly investigated, especially across the different developmental stages. To improve this knowledge, we characterize the microbiota among different developmental stages of the Indian meal moth, Plodia interpunctella, which is considered one of the major pest of commodities world-wide. Using culture-independent approach based on Illumina 16S rRNA gene sequencing we characterized the microbiota of four developmental stages: eggs, first-, and last-instar larvae, and adult. A total of 1022 bacterial OTUs were obtained, showing a quite diversified microbiota associated to all the analyzed stages. The microbiotas associated with P. interpunctella resulted almost constant throughout the developmental stages, with approximately 77% of bacterial OTUs belonging to the phylum of Proteobacteria. The dominant bacterial genus is represented by Burkholderia (?64%), followed by Propionibacterium, Delftia, Pseudomonas, and Stenotrophomonas. A core bacterial community, composed of 139 OTUs, was detected in all the developmental stages, among which 112 OTUs were assigned to the genus Burkholderia. A phylogenetic reconstruction, based on the 16S rRNA, revealed that our Burkholderia OTUs clustered with Burkholderia cepacia complex, in the same group of those isolated from the hemipterans Gossyparia spuria and Acanthococcus aceris. The functional profiling, predicted on the base of the bacterial 16S rRNA, indicates differences in the metabolic pathways related to metabolism of amino acids between preimaginal and adult stages. We can hypothesize that bacteria may support the insect host during preimaginal stages.

关键词： Burkholderia Illumina sequencing Indian meal moth insect symbiosis Proteobacteria

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Analysis of the Logistic Function of Ukraine as A Gate to Europe for Chinese Investment

Analysis of the Logistic Function of Ukraine as A Gate to Eu...

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作者： Zviahintseva-Tal daria 北京外国语大学

学位级别：硕士

从2010年起,中国与欧洲国家特别是乌克兰的合作更加密切。这种合作是由各种因素引起的。为了回答这个问题,本文将分析乌克兰作为一个潜在的物流中心,并与地理位置相近的国家:波兰和捷克共和国进行比较。从国际角度来看,本论文充分考虑...

从2010年起,中国与欧洲国家特别是乌克兰的合作更加密切。这种合作是由各种因素引起的。为了回答这个问题,本文将分析乌克兰作为一个潜在的物流中心,并与地理位置相近的国家:波兰和捷克共和国进行比较。从国际角度来看,本论文充分考虑《乌克兰-欧盟联盟协议(2017年)》,并探究其是否对中国投资乌克兰的决定有直接影响。论文共分五章,包括引言部分和结论部分。第一章是总体概述,以及本论文的目的、目的和方法,为本论文的研究提供背景。第二部分分析了物流枢纽的概念及其主要特点。第三部分简要概述了对乌克兰的分析,并解释了为什么欧盟协议对中国投资者很重要。第四章对乌克兰、波兰和捷克作为中国物流枢纽和投资目的地的潜力进行了比较分析。最后一章包含了本研究的结论和建议,以提高乌克兰成为投资的合适目的地以及在“一带一路”倡议下的物流中心的潜力。研究表明了物流中心的重要性,因为它们对运输系统的有效性有着巨大的影响,而运输系统对于贸易伙伴(如中国和欧洲国家)之间的货物流动至关重要。在“一带一路”倡议下,乌克兰一直被视为潜在的物流枢纽。但是,与捷克共和国和波兰相比,乌克兰由于金融和经济状况不稳定,包括过去几年报告的高腐败程度,因此投资目的地并不安全。本文建议实施交通基础设施方面的重大改革,以及有助于降低腐败水平的立法。与此同时,清楚的认识到“一带一路”倡议的主要方向,建设适当的物流基础设施,将有利于中国和欧洲主要物流枢纽之间的货物运输。

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