Template-free method to fabricate polymer-derived microporous SiOC ceramic composite with magnetic property and its application

采用无模板的聚合物先驱体陶瓷(PDC)法制备多孔陶瓷，是指利用聚合物先驱体自身陶瓷化过程或高温碳热还原等反应过程中逸出的气体成孔。但由于先驱体在陶瓷化转变过程中有明显的体积收缩，导致基体和孔不稳定。因此，如何在较高的热解温度(600-800℃)下制备稳定的多孔陶瓷仍是研究的难点。此外，虽然关于多孔陶瓷制备的研究较多，但关于多孔陶瓷后续的实际应用(如分离、催化等)并未进行深入探索。因此如何将制备出的多孔陶瓷转化为应用，仍需进一步的研究。 本文基于上述问题，采用含磁性金属的乙酰丙酮化合物对聚碳硅烷进行改性，在600-700℃下热解后制备出稳定的SiC基微孔陶瓷，并对其在催化染料降解领域的应用进行...Template-free synthesis of polymer-derived microporous ceramics is developed based on therelease of gaseous by-products during the pyrolytic transformation of polymeric precursors or the carbothermal reaction of ceramics. However, owing to the significant volume shrinkage, the pores generated during the polymer-to-ceramic transformation are not stable and disappear as the thermolysis temperature i...学位：理学硕士院系专业：材料学院_高分子化学与物理学号：2072012115006

A Comparative Study of Poems Translation in Hong Lou Meng from the Perspective of Semantic Translation and Communicative Translation

中国四大名著之一的《红楼梦》被誉为中国文化的百科全书，其中的古典诗词部分也是中国文化的艺术珍宝。诗歌作为形式及内容独树一帜的文学体裁，同时具有抒情性、含蓄性以及精炼性，包含诸多意象。《红楼梦》中诗歌占了很大的比重，它们对故事的开始、发展、结局以及对人物命运性格的描写与预测起着举足轻重的作用。因此，《红楼梦》诗歌翻译意义重大。 本文对《红楼梦》诗歌予以简单介绍，并将其大致分为五类，包括暗合小说悲剧情节的，讽刺腐败作风的，彰显人物性格的，揭示人物命运的以及反映精神文化的。我们认为诗歌可译，并主张在翻译诗歌时，应忠实于原文。 本文以《红楼梦》诗歌翻译为研究对象，对比英译版本中两个全英译文——霍克...As one of the four Chinese classical novels, Hong Lou Meng is considered as encyclopedia of traditional Chinese culture, and the poems in it are also considered artistic treasures. As a literary genre with unique form and content, poems are lyrical, subtle, refining and contain lots of imagoes. Poems translation of Hong Lou Meng is significant to non-intralingua readers who want to learn Chinese c...学位：翻译硕士院系专业：外文学院英语语言文学系_翻译硕士学号：1202009115235

A Study on the Problems in the Legal Risk Management System of Company

风险已经成为现代社会的主导性特征之一。社会主体需要不断应对不同的风险。而且由于经济发展与法律的紧密结合，法律风险已然成为现代社会各种法律主体安全的主要威胁之一。在此种背景之下，法律风险管理制度在国外各类公司当中被普遍地建立起来。在中国，虽已有相当多的公司意识到建立法律风险管理制度的必要性以及其价值，但是中国公司在建立法律风险管理制度的过程中在制度理念、人员构成、管理制度和管理技术等方面却往往力有所未逮，频频发生损害后果严重的法律风险案件。这一形势的存在，是本文写作的主要动因。 本文认为，法律风险是指在公司经营管理的过程中，由于公司行为的不规范而导致的，给公司目标实现带来负面影响的法律上不利后...Risk has become one of the dominant features of the modern society in that the social subjects have to cope with diverse risks in their lives.With the close combination of economic development and law, legal risks have already developed into the major threat to all legal subjects of modern society. In such context legal risk management system has been widely established in all kinds of enterprises...学位：法律硕士院系专业：法学院法律系_民商法学(含劳动法学、社会保障法学)学号：20040816

An empirical study on the input frequency effects of Chinese characters by European-American elementary learners

摘要 频率效应是语言心理学领域一个非常重要的概念，西方学者提出了多个模型对频率的作用机制进行解释。在第二语言习得、语言教学、教材编撰等方面，频率效应机制也都起着十分重要的作用。以汉语教材为基础，选取汉字作为实验材料，通过实证研究探寻汉字输入频率对学习者汉字习得成效的影响，对于对外汉语教学具有重要的理论意义和实用价值。 本文借鉴了国内外二语学界相关研究，在对20名欧美学生的实证研究基础上，从二语习得、心理语言学、认知语言学等角度出发，分析汉语教材中不同输入频率的汉字对欧美初级汉语学习者的汉字习得所产生的影响。本文旨在发现不同输入频率、不同分布复现方式的汉字对于学习者产生的频率效应，为汉语教学...Abstract The study of frequency effects, several models of which were put forward by Western scholars to explain their mechanism of action, is a very important concept of linguistic psychology. It plays a very important role in second language acquisition, language teaching and teaching material compilation. It is of theoretical significance and pedagogical value in TCSOL to explore how frequency...学位：文学硕士院系专业：海外教育学院_语言学及应用语言学学号：2652010115128

汉语网络教学中的任务设计

任务型教学法强调以任务的设计和完成为中心来组织和安排教学,使语言在真实的交际中得到运用。深入探索教学任务的设计与安排,并在网络汉语教材编写、汉语教学中借鉴任务型教学法的成功经验,将对汉语网络远程教学效果产生积极的意义

Progress in Study on Symptoms of Irritable Bowel Syndrome and Intestinal Gas

肠易激综合征(IBS)是临床较常见的慢性功能性肠道疾病,在我国发病率呈逐年上升趋势。目前IBS病因和发病机制仍未完全阐明,可能与肠道气体有关。肠道气体通常由59%N_2、21%H_2、9%CO_2、7%甲烷(CH_4)以及4%O_2组成,其中H_2和CH_4仅由肠道细菌代谢产生。IBS患者常表现为腹胀等肠胀气症状,提示存在肠道积气。近年来,IBS症状与肠道气体的关系备受关注,本文就IBS症状与肠道气体的研究进展作一综述。Irritable bowel syndrome( IBS) is a commonly seen chronic functional bowel disease,the prevalence showed a rising trend in recent year in China. At present,the etiology and pathogenesis of IBS have not yet been fully elucidated,and may be related to intestinal gas. Intestinal gas is usually composed of 59% N_2,21% H_2,9% CO_2,7%methane( CH_4) and 4% O_2,in which H_2 and CH_4 are produced only by intestinal bacteria metabolism. IBS patients usually manifested as having abdominal distension and symptoms of flatulence,suggesting the occurrence of accumulation of intestinal gas. In recent years,the relationship between symptoms of IBS and intestinal gas has attracted much attention.This article reviewed the progress in study on symptoms of IBS and intestinal gas.吴阶平医学基金会资助项目(320.6750.15231

Analysis of Problem Representation and Its Causes in Universities Classroom Teaching

关于大学课堂教学质量的内涵,国内外学者持“投入论““标准论“和“发展论“三种观点。目前我国大学课堂教学质量不高主要表现在:学校、教师和学生各主体对教学投入不足,教师教学的科学性、艺术性缺失,学生综合素质的发展未落到实处。这些问题的产生与高校重科研、轻教学的文化氛围、制度环境、教师教学素养、教学监督机制和素质教育游离于专业课课堂教学之外等密不可分。提升大学课堂教学质量,需要政府、学校、教师和学生各主体的共同努力。The connotation of college classroom teaching quality is divided into three kinds: "investment theory","standard theory"and"development theory".The lower teaching quality in the universities of China is represented as the insufficient effort on the teaching from the university,teachers and students,lack of scientific and artistic teaching,no practice of the comprehensive qualities of the students.The occurrence of the problems is closely related with the cultural environment of highlighting scientific research and belittling teaching in the university,institutional environment,teachers' teaching quality,teaching supervising mechanism,and quality education being far from the classroom teaching etc..To promote the teaching quality of university,efforts should be combined together from the government,universities,teachers and students

厦门市社区居民对分级诊疗的满意度及其影响分析

本文利用问卷调查数据,运用主成分分析法和Logit回归方法,分析居民选择社区医院诊疗的影响因素,实证结果发现:社区医院医生专业水平、设备先进度及药品储备的回归系数为2.3734,在1%的显著性水平下显著;居民对分级诊疗政策实施的满意度回归系数为1.5078,在10%的显著性水平下显著。研究结果表明,社区医院的专业水平、设备先进度及药品储备依然是居民是否选择去社区医院就医的关键影响因素,分级诊疗政策的实施对居民选择社区医院有显著的正向影响,但影响弱于社区医院的专业水平、设备先进度及药物储备等因素的作用。福建省教育厅中青年教师教育科研项目“厦门市分级诊疗制度变迁与地方政府制度创新研究”(JAS170005);;厦门市社科重点项目“厦门市分级诊疗实施现状及模式特色的调查与研究”(2016B09号

Precipitated Phase of Titanium Alloy with Adding Nd Elements

通过粉末冶金方法(冷等静压-真空烧结)制备钛合金Ti-6Al-4V-2Cr-1Nd, 经过固溶-时效热处理后, 利用光学显微镜(OM)、; X射线衍射仪(XRD)和透射电镜(TEM)分析合金的微观组织、 物相的组成及析出相的形核特点, 研究添加稀土元素Nd对析出相的影响。; 实验结果表明,在添加1%Nd(质量分数)元素后, 钛合金组织得到了明显细化;通过合金细化成核理论分析发现, 添加稀土元素Nd后,; 固溶时效中Nd_2O_3可以作为形核的基础, 促进形核, 所以稀土Nd元素可以有效促进非均匀形核, 主要析出相Nd_2O_3有利于晶粒的细化,; 是有效的形核剂;在高分辨透射电镜下对离子减薄后的试样进行观察,通过对合金的形貌和析出物进行傅里叶变换(FFT)和反傅里叶变换(IFFT)分析,; 得到清晰的原子排列图, 发现析出相Nd_2O_3与基体alpha-Ti之间存在平行相界面, 经分析为半共格界面。Titanium alloy Ti-6Al-4V-2Cr-1Nd prepared by powder metallurgy method; (cold isostatic pressing and vacuum sintering) was researched. The; microstructure, phase composition and precipitated phase nucleation; process were analyzed by optical microscope (OM), X-ray diffraction; (XRD) and transmission electron microscope (TEM) after solution and; aging treatment. The effect of adding rare earth element Nd to the; titanium alloy on its precipitated phase was studied. The experimental; results showed that the microstructure refinement effect was obvious; after adding rare earth element 1%Nd (mass fraction); based on the; analysis of alloy refining nucleation theory, it was found that after; adding Nd, Nd_2O_3 could serve as the basis of nucleation because of its; high energy, promoting nucleation, there fore Nd could promote the; heterogeneous nucleation effectively, the main precipitation phase; Nd_2O_3 was beneficial to refining crystalline grains and it was; effective nucleating agents. Through high resolution observation of ion; thinning sample, and the morphology of the alloy precipitates were; analyzed by fast Fourier transform (FFT) and inverse fast Fourier; transformation (IFFT). It was found that there was parallel interface; between precipitated phase Nd_2O_3 and matrix alpha-Ti, and it was; semi-coherent interface shown by analysis.河南省重大科技专项项

Study on Corrosion Resistance of Zr-0.8Sn-1Nb-0.3Fe Alloy after Kr~+ Ion Irradiation

采用高压釜腐蚀实验研究了2种不同制备工艺下的Zr-0.8Sn-1Nb-0.3Fe合金(1#,2#)经360℃、5~25; dpa的Kr~+辐照后、在400℃/10.3 MPa过热蒸汽中的耐腐蚀性能,用透射电子显微镜(TEM)、扫描电镜(SEM)、; X射线衍射仪(XRD)分析合金腐蚀后氧化膜显微组织结构。结果表明,100; d腐蚀后,合金的腐蚀增重随着辐照剂量的增加而增加,由于1#合金中的第二相比2#合金更为细小、弥散,相同辐照剂量下,前者的腐蚀增重较低。腐蚀转折前; ,从蒸汽腐蚀侧到锆合金基体,氧化膜中的氧含量逐渐降低,靠近蒸汽侧的氧化膜主要由等轴晶形态的单斜ZrO_2组成,而基体界面处的氧化膜主要为柱状晶形; 态的四方ZrO_2和六方Zr_3O;腐蚀转折后,基体界面处的氧化膜呈"花菜"状生长,"花菜"尺寸大小与氧化膜生长速率的高低及不均匀生长趋势的大小; 呈对应关系。The corrosion resistance of Zr-0.8Sn-1Nb-0.3Fe alloys prepared by two; different processes was investigated in 400℃/18.6MPa superheated steam; by static autoclave after irradiated by 360℃ with Kr~+-irradiation of; 5~25 dpa. The microstructures of oxidation film after corrosion were; analyzed by TEM, SEM, and XRD. The results showed that the corrosion; weight-gain increased with the irradiation dose, while the weight-gain; of 1# alloy with smaller and more dispersive SPPs than 2# alloy was; lower under the same irradiation dose. Before corrosion turning, the; oxygen content in the oxidation film decreased from the steam-side to; the zirconium matrix. The oxidation film beside the steam-side was; mainly composed by equiaxied monoclinic ZrO_2 crystal, while near the; film/matrix interface by columnar quartet ZrO_2 crystal and hexagonal; Zr_3O crystal. After transition of corrosion weight, the film near the; interface grew like cauliflowers, and the size of cauliflowers were; corresponded to the growth rate and uneven growth trend of oxidation; film