Efficient interlayer charge release for high-performance layered thermoelectrics

Many layered superlattice materials intrinsically possess large Seebeck coefficient and low lattice thermal conductivity, but poor electrical conductivity because of the interlayer transport barrier for charges, which has become a stumbling block for achieving high thermoelectric performance. Herein, taking BiCuSeO superlattice as an example, it is demonstrated that efficient interlayer charge release can increase carrier concentration, thereby activating multiple Fermi pockets through Bi/Cu dual vacancies and Pb codoping. Experimental results reveal that the extrinsic charges, which are introduced by Pb and initially trapped in the charge-reservoir [Bi₂O₂]²⁺ sublayers, are effectively released into [Cu₂Se₂]²⁻ sublayers via the channels bridged by Bi/Cu dual vacancies. This efficient interlayer charge release endows dual-vacancy- and Pb-codoped BiCuSeO with increased carrier concentration and electrical conductivity. Moreover, with increasing carrier concentration, the Fermi level is pushed down, activating multiple converged valence bands, which helps to maintain a relatively high Seebeck coefficient and yield an enhanced power factor. As a result, a high ZT value of ∼1.4 is achieved at 823 K in codoped Bi_0.90Pb_0.06Cu_0.96SeO, which is superior to that of pristine BiCuSeO and solely doped samples. The present findings provide prospective insights into the exploration of high-performance thermoelectric materials and the underlying transport physics.     

Information management for the internationalization of SMEs: An exploratory study based on a strategic alignment perspective

The ability to internationalize has become a competitive necessity for many SMEs, enabling their survival and access to larger markets. From an IS research perspective, one important issue is the strategic role played by the firm's IT capabilities in responding to greater environmental uncertainty and correspondingly greater information requirements, and in enabling the firm's internationalization performance. Given that such a major aspect of the influence of IT on the performance of SMEs has so far been ignored, the following research question is posed: to what extent does the match between the IT capabilities and information requirements of SMEs contribute to their internationalization performance? Our research model and hypotheses are based on Tushman and Nadler's information processing model. In revisiting this model, the aim was to show its continued relevancy and extend its domain of applicability. In order to answer the research question, we conduct a survey-based empirical study of 174 Canadian SMEs that have internationalized their activities. Our results show that a better match between IT capabilities and information requirements does indeed exert a positive influence on internationalization performance. We also find that the SMEs’ IT capabilities are influenced externally by the environmental uncertainty and internally by their internationalization mode.     

一种基于“PERFORM”的团队绩效评价新体系

在对团队绩效评价研究文献综述的基础上,从一个新的视角,即从团队的"PERFORM"特征出发,构建7个评价维度27个具体评价指标的团队评价新体系。依据新体系,运用层次分析方法,给出一个团队评价的应用实例。     

科技人才绩效评估方法研究

科技人才绩效评估是科技管理体制的重要组成部分,是保证科技工作顺利进行的基本运行机制。近年来,许多单位和部门都在探索科学、客观、公正的科技人才绩效评估方法,本文研究了科技人才绩效评估的含义和重要意义,对科技人才绩效评估的指标体系和常见的评估方法进行了研究和论述。     

A highly alkaline-stable metal oxide@metal–organic framework composite for high-performance electrochemical energy storage

Most metal–organic frameworks (MOFs) hardly maintain their physical and chemical properties after exposure to alkaline aqueous solutions, thus precluding their use as potential electrode materials for electrochemical energy storage devices. Here, we present the design and synthesis of a highly alkaline-stable metal oxide@MOF composite, Co₃O₄ nanocube@Co-MOF (Co₃O₄@Co-MOF), via a controllable and facile one-pot hydrothermal method under highly alkaline conditions. The obtained composite possesses exceptional alkaline stability, retaining its original structure in 3.0 M KOH for at least 15 days. Benefitting from the exceptional alkaline stability, unique structure, and larger surface area, the Co₃O₄@Co-MOF composite shows a specific capacitance as high as 1020 F g⁻¹ at 0.5 A  g⁻¹ and a high cycling stability with only 3.3% decay after 5000 cycles at 5 A g⁻¹. The as-constructed solid-state flexible device exhibits a maximum energy density of 21.6 mWh cm⁻³.     

对某系统业务终端数据丢包现象的深入分析

本文以淮南矿业集团蔡家岗通信站为背景,以该站发生的一例系统业务终端数据丢包故障为例,详细介绍了该故障处理过程,深入分析了该现象产生的原因,供技术维护人员参考。     

实时嵌入式系统Debug方法一例

本文针对嵌入式实时系统对性能要求高的特点,给出了一个在这种系统下获取trace的方法。这种方法直接读取系统内存,对整个系统的性能没有任何影响。在嵌入式实时系统开发中,经常需要用到这种方法。     

高能碰撞中横向矩与纵向矩的比较研究

用蒙特-卡洛模拟方法对纵向阶乘矩和横向阶乘矩进行了比较和研究。发现：在一般情况下．只有在引入累积变量后,纵向阶乘矩才与横向阶乘矩相等。冈此,在高能碰撞非线性现象（间歇和分形）的研究中,只有采用了累积变量时,才能使用横向阶乘矩进行计算。另一方面,在单事件分析中,使用横向阶乘矩进行计算是有意义的。     

高功率Ni/MH电池用AB5型负极储氢合金的研究

研究和开发具有优异高倍率特性的储氢电极合金是发展高功率型Ni/MH电池的技术关键,具有重大的理论意义和商业价值。基于合金热力学和动力学行为的讨论,研究了AB5型储氢电极合金的微结构对其倍率放电性能的影响。结果表明,由于非化学计量(B/A >5 )和高催化活性第二相的引入,B侧添加硼或钼可以显著提高合金的高倍率放电容量和低温放电容量。进一步结合A侧稀土成分优化,发展出一类具有优异倍率性能的MmNi3.55Co0.75Mn0.4Al0.3Bx(Mm为混合稀土)合金。该系列合金有望应用于高功率Ni/MH电池和低温( - 35 oC)Ni/MH电池。     

利用反相高效液相色谱法测定硝基多环芳烃的正辛醇－水分配系数和水溶解度

用反相高效液相色谱法测定了１５种致突变硝基多环芳烃的正辛醇－水分配系数和水溶解度，所得结果分别与摇瓶法和动态联柱法测定值相符较好。     

浅谈高中物理新课引入的方法

物理学科的特点是从实验出发,研究抽象的问题。在高中物理教学中一个非常重要的任务就是要培养学生的学习兴趣,从兴趣出发来学习物理知识。那么设计一些有效的、有趣的方式方法来引入新课所要用到的物理情景,是物理新课成功与否的关键,本文将就物理新课引入的几种方法进行分析。     

科技社团绩效评价四维框架模型研究

本文剖析了现代科技社团绩效评价的内涵,探讨了科技社团评价的主体要素,构建了科技社团绩效评价四维模型,提出了现代科技社团绩效评价的指标体系。     

生态福利绩效——可持续发展新的分析工具

从环境可持续、人类福利以及两者间关系研究现状分析的基础上,梳理生态福利绩效概念的提出与相关的研究现状,以期为生态福利绩效的进一步研究奠定基础。     

浅谈初中原声英语电影校本课程

校本课程是日常课堂教学的延续和补充。笔者通过开设原声英语电影欣赏校本课程,从具体课程操作流程和促进作用阐述具体实践。     

高阶Chebyshev低通滤波器的快速设计

Chebyshev滤波器是一种常用的高性能滤波器。本文通过对Chebyshev滤波器的系统函数的推导分解,提出了一种可以快速实现高阶Chebyshev低通滤波器电路的方法,并给出了设计高阶Chebyshev低通滤波器电路的各元器件参数的计算公式。最后运用该算法快速设计了一个7阶Chebyshev低通滤波器,并采用Saber软件对设计的7阶Chebyshev低通滤波器进行了理论分析验证。     

具有二次性能指标的最优输出反馈的一个必要条件

本文用矩阵的秩这个工具考察了有限维线性系统具有二次性能指标的最优输出反馈问题，得到了一个必要条件。特殊情形下，这一条件可以演化为最优输出反馈增益与观测矩阵的乘积即为状态反馈增益这个相当清晰的关系。     

在校园开展“英语短剧表演”对提升英语能力的研究

本文在英语课堂教学中开设和实施英语短剧表演训练,并以汇报演出的评价方法来检验教学效果,鼓励学生利用各种机会挖掘生活和课堂中丰富的英语口语素材。在表演中学习英语,在学习中收获成功,展示同学们的表演才能,通过排练、表演等＂戏剧化活动＂,为学生在趣味情景中营造一个轻松愉快的英语学习环境,帮助他们提高英语学习兴趣,巩固所学语言知识,提高口语表达能力,并了解东西方文化的差异,提高跨文化交际能力。同时,课题实验教师英语口语和教学水平也得到显著提高。     

浅谈学前教育专业舞蹈教学中表演意识的培养

高校本科学前教育专业舞蹈教学具有一定的特殊性,其学生大多零基础,柔软性、协调性较差。培养舞蹈表演意识能有效地提高学前教育专业舞蹈教学质量,符合学前教育专业学生特点,使学生未来更好地胜任幼儿园舞蹈教学工作。本文从学前教育专业学生的特点及学习舞蹈面临的困难入手,分析表演意识培养对学前教育专业舞蹈教学的重要意义,提出培养舞蹈表演意识的有效方法,以期为学前教育专业舞蹈教学提供微薄的见解。     

上海市地方高校重点学科建设验收评估指标体系研究

针对上海市教委第三批重点学科中期评估所采用的评估指标体系存在的动态性和定量化方面的缺陷,根据重点学科建设要求和制订评估指标体系的原则,结合访谈,设置了由35条定性和定量指标组成的重点学科建设验收评估指标体系。运用专家咨询法,确立了各评估指标的权重,并确定了综合评估分的计算方法。采和该方法对26个重点学科中期评估的有关资料进行了回顾性验证。本研究制订的评估指标体系,在一定程度上消除了重点学科原有水平的不一致对评估结果的影响。同时,也在一定程序上消除主观因素对评估结果的影响。     

我国西部生态脆弱性的评估:预控研究

如何遏制我国西部生态环境恶化成为当务之急,这需要对生态脆弱性进行评估以掌握存在的具体问题.本文通过构建生态脆弱性发生与应对的机理模型,发现应对的关键环节在于对脆弱性进行评估,其环节包括构建数据库,挖掘评估指标,单项、整体脆性评估,脆性与地方政府协同度评估等.根据评估结果,政府可以在策略矩阵中选择适当的应对工具.