Boundedness of certain integral operators with rough kernels

本学位论文研究沿低维集的粗糙核~Marcinkiewicz~积分算子、多参数奇异积分算子以及多线性奇异积分算子及其交换子的有界性.全文共分七章： 第一章概述本文所研究问题的背景以及国内外研究现状,并简单介绍 本文的主要结果与结构安排. 第二章讨论当积分核满足$\Omega\in\mathcal{F}_{\beta}(S^{n-1})\,(n\geq2)$时,沿多项式复合子流形的抛物型Marcinkiewicz积分算子的$L^p$有 界性,这些结果本质上改进和推广了一些已有的结果.并在主要结果的证明过程中给出了一个系统的处理方法. 第三章考虑带径向粗糙核的沿多项式复合曲线的...This thesis is devoted to studying the $L^p$ bounds for rough Marcinkiewicz integrals and multiple singular integrals associated to certain lower-dimensional sets and the boundedness of multilinear singular integrals and commutators. It is consists of seven chapters as follows. In Chapter 1, we firstly give a brief review of the background of the related problems and state our main results. We...学位：理学博士院系专业：数学科学学院_基础数学学号：1902012015382

Vibration Damping of Carbon Nanotube Assembly Materials

Vibration reduction is of great importance in various engineering applications, and a material that exhibits good vibration damping along with high strength and modulus has become more and more vital. Owing to the superior mechanical property of carbon nanotube (CNT), new types of vibration damping material can be developed. This paper presents recent advancements, including our progresses, in the development of high-damping macroscopic CNT assembly materials, such as forests, gels, films, and fibers. In these assemblies, structural deformation of CNTs, zipping and unzipping at CNT connection nodes, strengthening and welding of the nodes, and sliding between CNTs or CNT bundles are playing important roles in determining the viscoelasticity, and elasticity as well. Towards the damping enhancement, strategies for micro-structure and interface design are also discussed

Bio-Inspired Aggregation Control of Carbon Nanotubes for Ultra-Strong Composites

High performance nanocomposites require well dispersion and high alignment of the nanometer-sized components, at a high mass or volume fraction as well. However, the road towards such composite structure is severely hindered due to the easy aggregation of these nanometer-sized components. Here we demonstrate a big step to approach the ideal composite structure for carbon nanotube (CNT) where all the CNTs were highly packed, aligned, and unaggregated, with the impregnated polymers acting as interfacial adhesions and mortars to build up the composite structure. The strategy was based on a bio-inspired aggregation control to limit the CNT aggregation to be sub 20--50 nm, a dimension determined by the CNT growth. After being stretched with full structural relaxation in a multi-step way, the CNT/polymer (bismaleimide) composite yielded super-high tensile strengths up to 6.27--6.94 GPa, more than 100% higher than those of carbon fiber/epoxy composites, and toughnesses up to 117--192 MPa. We anticipate that the present study can be generalized for developing multifunctional and smart nanocomposites where all the surfaces of nanometer-sized components can take part in shear transfer of mechanical, thermal, and electrical signals

Wide-Range Tunable Dynamic Property of Carbon Nanotube-Based Fibers

Carbon nanotube (CNT) fiber is formed by assembling millions of individual tubes. The assembly feature provides the fiber with rich interface structures and thus various ways of energy dissipation, as reflected by the non-zero loss tangent (>0.028--0.045) at low vibration frequencies. A fiber containing entangled CNTs possesses higher loss tangents than a fiber spun from aligned CNTs. Liquid densification and polymer infiltration, the two common ways to increase the interfacial friction and thus the fiber's tensile strength and modulus, are found to efficiently reduce the damping coefficient. This is because the sliding tendency between CNT bundles can also be well suppressed by the high packing density and the formation of covalent polymer cross-links within the fiber. The CNT/bismaleimide composite fiber exhibited the smallest loss tangent, nearly as the same as that of carbon fibers. At a higher level of the assembly structure, namely a multi-ply CNT yarn, the inter-fiber friction and sliding tendency obviously influence the yarn's damping performance, and the loss tangent can be tuned within a wide range, as similar to carbon fibers, nylon yarns, or cotton yarns. The wide-range tunable dynamic properties allow new applications ranging from high quality factor materials to dissipative systems

灾害、叙事与地方生态知识:一个东南渔港的台风记忆

有关海洋灾害的记忆,是海洋社区集体叙事的重要组成部分。沙埕港是一个台风频发之地,长期以来,当地人围绕台风灾害形成了一种深刻的集体记忆。通过考察当地人对台风的多重叙事,我们可以认识到台风是如何被当作\"整体性社会\"中的一环而根植于社区集体记忆之中,成为其经验生活的一部分,并促使当地人重新唤起对地方生态知识的建构与实践。国家社会科学基金重大项目;;厦门大学田野调查基金支持项目(2017GF007

Research on Urban Gridding Community Management:Gulou District in Fuzhou as an example

基层不牢，地动山摇。中国的城市基层管理，在中国未来发展进程将扮演着极为重要的角色，也将面临着前所未有的巨大挑战。为破解传统管理模式带来的积弊，时下中国大小城市竞相引进城市社区网格化管理模式，并在实践中产生了良好效果。作为基层大胆探索实践的产物，社区网格化管理是中国特色社会管理创新的成功范例和重大成果，是世界城市管理、社区管理的一大创举，代表着现代城市基层管理的大趋势，未来亦极有可能引领中国的整个城市基层管理。 党的十八大强调，“提高社会管理科学化水平，必须加强社会管理法律、体制机制、能力、人才队伍和信息化建设”。这意味着社会管理是一场综合性的变革。本文认为，社区网格化管理正是对城市基层社区管...“Base is the foundation”. In the development process of China's future, urban grass-roots management will play a very important role , and also will be faced with unprecedented challenges. To break the long-standing abuse that traditional management model brings, nowadays more and more cities introduce Urban Gridding Community Management Model, and achieve good results in practice. As the produc...学位：公共管理硕士院系专业：公共事务学院_公共管理硕士(MPA)学号：1392010115044

Relative Comparison Antonyms

相对对照反义词和一般的反义词不一样,不具备逻辑概念上的矛盾关系或反对关系,主要是因为相互间因有某种联系引发联想,于是相互对照并经常使用。这类反义词既存在于言语系统中,具有临时性,也存在于语言系统中,具有相对稳定性。Relative comparison antonyms are not the same as ordinary ones,not having contradictory or contrary relation in logic and concept.They are oftenused relatively mainly because of association caused by some connection each other.The kind of antonyms not only lives in speech system and have transience,but also in language system and have relative stability

The study on the adjectival paraphrase group in

内容提要“形容”义类在《现代汉语词典》中是比较特别的一类释义，大部分词条都属于迂回释义，对它进行全面、系统的研究有助于我们更加了解《现代汉语词典》释义的优点与不足，从而更加有助于推进编纂工作的发展和完善。目前有很多学者对《现代汉语词典》释义的各个方面作了各种各样的探讨，取得了丰富的成果，但还缺少对“形容”义类进行系统、全面的研究。本文将在前人研究成果的基础上运用定性与定量相结合的方法，植根于《现代汉语词典》释义实践，结合与《现代汉语规范词典》的比较，对《现代汉语词典》“形容”义类进行比较多方位地、深入地研究。本文主要包括以下几个部分：第一章介绍《现代汉语词典》“形容”义类释义模式的研究现状、本...Abstract Adjectival paraphrase group is a special kind of paraphrase in “Modern Chinese Dictionary”,and most of them is indirect paraphrase. Overall and systematic study is helpful to learn of the advantages and shortcomings of the paraphrase of the “Modern Chinese Dictionary”,which can propel the developing and perfecting of dictionary anthologizing. At present ,many savants have a ...学位：文学硕士院系专业：人文学院中文系_汉语言文字学学号：20030102