Theoretical and numerical study of heat transport in low-dimensional systems

对低维系统热输运性质的研究一直以来都受到人们的普遍关注，特别是在近年来实验上对低维系统的制备和操控日趋成熟，纳米尺度小系统呈现的丰富的新奇物理现象以及其蕴藏的巨大应用潜能越来越受到研究者重视的背景下，对低维系统的热输运性质的研究就显得越发的重要。对于低维小系统，量子效应,非平衡态效应,以及非线性效应等都对体系的热输运性质有着极其重要的影响。本文对实际体系中普遍存在的界面热阻,热膨胀,以及近年来受到广泛关注的物质态的拓扑性质对低维系统的热输运性质的影响做了研究，并对一维简谐链中的涨落-耗散定理的成立与否做了讨论。此外，除了对上述具体问题的讨论外，我们还研究了低维系统热传导的一般性理论，发展了能够...In recent decades, intense attention has been paid to the thermal transport in low-dimensional systems. Processing on the experimental realization and manipulation of systems at the micro- or nano- scale have stimulated exploration of the zoo of novel phenomena and their potential application. The impact of quantum effect, non-equilibrium effect, and anharmonic effect on the thermal transport in l...学位：理学硕士院系专业：物理与机电工程学院_理论物理学号：1982012115276

中国生物医药上市公司的待业问题分析

世界首富比尔·盖茨预言：超过他的下一个世界首富必定出自生物技术领域，生物技术及作为其应用核心的生物医药的发展前景可见一斑。随着人类基因组计划的顺利进展，一个高技术、大规模的生物制药时期已经来临，全球范围内围绕生物医药的商业化科技大战已经拉开序幕。孙子曰：“知己知彼，百战不殆”。本文通过深入分析中国目前生物医药产业的发展现状，对照国外的发展进程，寻找制约中国生物医药产业和企业发展的关键因素，并探索解决之道。 本文的第一部分首先对生物医药行业进行了总体的概述，阐明了该行业的特点和对国家发展的重大意义，同时也对照分析了国外的发展状况，使读者对生物医药行业有一个总括性的了解。 本文的第二部分从对中...学位：工商管理硕士院系专业：管理学院工商管理教育中心_工商管理硕士(MBA)学号：19981501

The Design and Research of a Topological Multi-Functional Mechanophore

从探索新的化学理论到开发新型力响应聚合物材料，力化学特别是高分子力化学学科的飞速发展受到了广泛的关注。力色团是高分子力化学的核心，是一类在机械力的作用下能够发生特异性反应的活性基团。至今，已报道的力色团有数十种，有变色、发光、催化、释放小分子等响应方式，但大多数功能单一，不能满足力响应材料的设计与合成。 本文工作提出了一种将已有力色团重新排列组合从而制备多功能性复合力色团的合成方法。防护（Gated）力色团就是在目标力色团的前端嵌入一个保护性的力色团，要使得机械力传导到目标力色团并活化，保护力色团必须先被活化。这样的好处是可以延缓目标力色团响应性的表达，起到保护的作用，这为某些需要保护的基团...In the recent years, the explosion of polymer mechanochemistry attracted more and more researcher’s attention who were devoted on the development and application. The key problem is the innovation of mechanophores that can react under the mechanical force and result in the predictable response. Up to now, several dozens of mechanophores had been explored. But it can’t meet experts needs because o...学位：理学硕士院系专业：化学化工学院_高分子化学与物理学号：2052013115165

THE STUDY ON PSEUDO CRIME OF OMISSION

内容摘要无行为则无犯罪。行为有两种基本表现形式：作为和不作为。作为犯罪违反了刑法的禁止规范。不作为犯罪分为纯正不作为犯罪和不纯正不作为犯罪。纯正不作为犯罪违反刑法的命令规范，但不纯正不作为犯罪要复杂的多。不纯正不作为犯罪是指以不作为方式实施的通常由作为方式构成的犯罪。我国刑法在总则中未对不纯正不作为犯罪作任何原则性规定，在分则中也没具体规定。但对不纯正不作为犯罪定罪处罚，仍为学说和判例所肯定。故对不纯正不作为犯罪的定罪处罚是司法实践中的一大难题。本文结合德国、日本、台湾和我国大陆学者的论述，对不纯正不作为犯罪作深入探讨。全文分为四章，第一章是不作为与不作为犯罪，主要讨论有关不纯正不作为犯罪的基...Abstract No deeds done means no crimes committed。Deeds have two basic forms. one is commission, the other is omission. Crimes of commission violate the preventive rule of the criminal law. Crimes of omission consist of genuine crime of omission and pseudo crime of omission. The former violate the command rules while the latter is much more complicated. Pseudo crime of omission can be define...学位：法律硕士院系专业：法学院法律系_法律硕士(JM)学号：X20010811

A Study on the Regional Spatial Relationship among Cities in Shandong Province Based on Space of Flows

城市间的关系是编制区域规划和制定区域政策的基础。本文以山东省为研究对象，通过对通信信息流、网络信息流、公路客流、铁路客流等多种流空间的综合分析，展开对山东省域城市间关系的研究。研究发现：就省域的整体格局而言，要素流沿通道聚集，呈轴线布局，济青铁路和京沪铁路形成的T型双轴线区域尤其明显，导致省域呈现出北部强于南部、东部高于西部，差异显著的次区域联系特征；就中心体系而言，山东省域的网络化程度较高、多层级中心集聚态势明显，地理邻近的城市间互动关系更强。The regional spatial relation is the basis of making the regional planning and the regional policies.Taking Shandong Province as the research object,this paper studies the regional spatial relationship in Shandong Province through the comprehensive analysis of communication flow,internet information flow,highway passenger flow and railway passenger flow.The result shows that in terms of the overall pattern of the province,the elemental flow is concentrated along the channel and is arranged in the axis line.The"T"type double axis region is more obvious in the Jinan-Qingdao and Beijing-Shanghai regions,leading to a variant and nonequilibrium characteristics of Shandong Province.As to the central system,there is a high degree of network with multi-level centers and strong interactions of adjacent cities.国家自然科学基金项目资助(项目批准号51508485和51478216)福建省自然科学基金资助项目(2016J01262

Jointing sparse recovery estimation algorithm of underwater acoustic channels with long time delay spread

对具有长时延扩展的水声信道,传统的信道估计算法如最小二乘法将在大量零值抽头产生严重的估计噪声,导致估计性能下降,同时信道估计时所需的较高估计器阶数大大提高了运算复杂度。压缩感知信道估计方法可有效利用多径稀疏特性改善性能,但需采用较大的训练序列长度以保证稀疏恢复精度,由此导致额外的系统开销。利用水声信道多径稀疏结构在数据块间存在的相关性,建立基于分布式压缩感知的长时延水声信道联合稀疏模型,从而可利用同步正交匹配追踪算法进行联合重构,以进一步减小系统的训练序列开销,提高估计性能。最后通过仿真和海上实验验证了所提方法的有效性。Efficient estimation of underwater acoustic channels with a large time delay spread was addressed. For the conventional channel estimation methods such as LS, this type of channel estimation would produce serious estimation noise in zero-value taps which lead to poor performance of channel estimation. At the same time, a large time delay spread posed significant difficulties such as large channel order and the corresponding huge computation complexity. Compressed sensing(CS) channel estimation algorithm offered a solution to this problem by exploiting the sparsity of channel to improve the estimation performance. However, to ensure acceptable estimation performance, a long training sequence was needed, which unfortunately would cause additional overhead. A method was proposed which exploiting the joint correlation of sparse multipath structure between adjacent data blocks to deal with the estimation of long time delay channels under the framework of distributed compressed sensing(DCS).Thus the large time delay underwater acoustic channels can be jointly reconstructed by the simultaneous orthogonal matching pursuit(SOMP) algorithm to facilitate the system overhead reduction and estimation performance improvement. Simulation as well as the sea trial results indicate the effectiveness of the proposed method.国家自然科学基金资助项目(No.11274259,No.11574258)~

A Study on the Effects of Topics on an Opinion Sentences Identification System for Micro-blog Data

为了从海量的网络信息中迅速准确地获取评价信息,观点句识别已经成了自然语言处理的一个研究热点。现在观点句识别系统大都是基于机器学习的方法,一般使用机器学习的方法来进行分类会受到领域差异性影响。针对这个问题,该文对微博观点句识别系统是否会受到微博话题影响做了经验性研究,同时为了弥补训练数据的不足,该文通过规则方法自动标注网络数据进行了训练集的扩充。实验结果表明,微博话题间存在差异,进行分话题模型训练可以提升微博观点句识别系统的性能。As an important stage for information extraction, the problem of Opinion Sentence Identification(OSI) has attracted more and more attentions from NLP researchers in the past decade.Similar to other areas in NLP, most current OSI systems are built based on machine learning(ML) technologies, which often suffer from the problem of domain/topic adaptation.In this paper, an empirical study was conducted to test whether the topic difference among the micro-blog data effects on the performance of an ML-based OSI system, which used rule-based automatic annotation methods to expand the training set.The experimental results indicated that by introducing a topic classifier and performing the training based on the sub topics, the performance of the OSI system for micro-blog data could be improved significantly.国家自然科学基金项目(61005052); 国家科技支撑计划课题(2012BAH14F03); 中央高校基本科研业务费专项资金(2010121068); 福建省自然科学基金项目(2011J01369

智能科学与技术专业本科培养方案在大类招生模式下的修订

大类招生模式是高校人才培养模式发展的新趋势。以厦门大学为例,介绍智能科学与技术专业本科培养方案在大类招生模式下的修订方案,探讨大类招生模式下智能科学与技术专业建设的几个问题

基于词向量空间的大规模中文语义网络构建与复杂性分析

当前对于汉语语义层次的语言网络研究方法仅限于静态词典生成以及人工手动生成两种方法,具有很大的局限性。对此,该文从大规模语料库生成的语义空间出发,结合语义空间丰富的语义信息和义类词典资源,提出一种新颖的基于分布语义的语义网络构建策略,并在此基础上探究了由不同性质的语义空间所构建的语义网络的统计特性。相比前人的方法,该文提出的方法优势在于无需依赖人工标注,支持大规模动态语料的网络自动构建。实验结果表明,语义网络具有复杂网络两个典型的特性:小世界效应和无标度特性。此外,由于语义网络描述的是词之间最为本质的语义关系,与不同文体中的措辞、使用习惯、风格等不存在直接的关系,因此当语义网络节点到达一定规模时,语义网络的某些统计特性可能会趋于一致

MnO/Nitrogen-doped graphene composite cathode for high performance lithium oxygen batteries

本文采用水热法制备了MnO/氮掺杂石墨烯复合材料. 作为非水锂空气电池的正极催化剂, 该复合材料表现出了优异的电化学性能以及循环稳定性.; 在充放电电流密度为0.05 mA cm~(-2)时, 其能量效率高达84.6%, 远高于目前文献所报道的非贵金属催化剂的能量效率,; 也超过了基于贵金属的催化剂. 其氧还原反应(ORR)和氧析出反应(OER)的过电势分别仅为0.11和0.41 V.; 扫描电子显微镜(SEM)和透射电子显微镜(TEM)结果表明, 所制备的MnO纳米颗粒能够均匀地分散在氮掺杂石墨烯的表面.; 密度泛函理论(DFT)计算揭示, MnO(100)面是主要的催化活性面, 其理论ORR和OER的过电势分别仅为0.21与0.24 V,; 充放电电势差为0.45 V, 与实验结果0.52 V相当.MnO/nitrogen-doped graphene (MnO/NG) composite cathode was fabricated by; a facile one-pot method as cathode catalyst for non-aqueous lithium; oxygen batteries. It exhibited superior electrochemical performance with; higher round-trip efficiency and better cyclic stability. It showed a; high round-trip efficiency of 84.6% at the current density of 0.05 mA; cm~(-2) with the discharge and charge overpotentials of 0.11 and 0.41 V,; respectively. Through scanning electron microscopy, transmission; electron microscopy and X-ray photoelectron spectroscopy, it was; confirmed that MnO nanoparticles were homogeneously dispersed on NG; surface. The density functional theory calculations demonstrated that; the superior electrochemical performance of MnO/NG might be attribute to; the exposure of stoichiometric MnO (100) surface, with the ORR and OER; overpotential only to be 0.21 and 0.24 V, respectively. The; discharging-charging voltage gap is 0.45 V, in good agreement with the; experimental value of 0.52 V.国家重点基础研究发展计划; 国家自然科学基金; 国家基础科学人才培养基