Physical Properties of Magneto-Optical Crystal Units Array

随着通信技术的高速发展，磁光器件因其具有独特的光学性质而被广泛应用于信息存储、医疗、航天等各个领域。近年来，磁光效应越来越受到研究者的关注，而磁光效应中的法拉第效应更是研究的热点。衡量法拉第效应的两个指标是法拉第偏转角和椭偏率。但是，法拉第效应采用的是透射光，因此，在增强法拉第效应的同时，透射率也同样被增强才是应用的首选。目前增强法拉第效应的方法主要是利用铁磁材料结合贵金属的局域表面等离激元共振特性和表面等离激元共振特性两种途径来达到增强目的。等离激元共振特性的作用主要是调控电磁场在铁磁材料体内的分布。本文主要研究周期纳米孔阵列Au/BIG双层异质膜的法拉第效应，以及Au/Co纳米粒子阵列和空...With the rapid development of the communication technologies,magneto-optical devices are widely used in information storage, medical, aerospace and other fields owing to their unique optical properties. In recent years, magneto-optical effect got more and more attention and the Faraday effect was a hot research topic. Two criteria in judging Faraday effect are Faraday rotation and Faraday elliptic...学位：工学硕士院系专业：物理科学与技术学院_工程硕士(电子与通信工程)学号：1982013115300

Photocatalytic Degradation of Organochlorine Pesticides on Nano-TiO2 materials

近年来，环境污染已成为备受关注的全球性问题。农药、持久性污染物（Pops）、环境荷尔蒙等具有较高残留毒性的污染物的产生，对人类生活造成了一定的危害和影响。光催化降解污染物是一种较为有效、操作简便、低费用、对环境友好的降解方式，已广泛应用于化学、环保、纺织等领域。本论文工作以纳米二氧化钛（TiO2）材料，包括纳米TiO2颗粒和TiO2涂层膜为光催化剂，讨论了有机氯农药的光催化降解行为和降解机理，并提出了有机氯快速检测的方法。同时还自行合成TiO2纳米管，探讨了对罗丹明染料的吸附特性和光催化应用。 本论文共五章。 第一章，文献综述，主要介绍半导体光催化的概况、基本原理、应用以及纳米TiO2材料...Environmental pollution has been become a global problem recently. The production of pesticides, persistent organic pollutants (POPs) and environmental hormone with higher residual toxicity cause a certain danger to human life. Photocatalytic degradation of environmental pollution has widely been used in chemical, environmental and textile field due to its easy-operation, low-cost, environmental-f...学位：理学硕士院系专业：化学化工学院化学系_分析化学学号：20042513

The influence of Constituent materials on the shrinkage cracking of Ready-Mixed Concrete and Crack-Resistance optimal design of Concrete Mix Ratio

随着我国大规模基础设施建设对混凝土的巨大需求，商品混凝土以其专业化生产、精确的质量控制、文明和快速施工等优点在我国土木工程中得到广泛应用。由于商品混凝土的大流动性、胶凝材料用量多、砂率大等特点，混凝土开裂现象有增无减。在混凝土技术可持续发展与混凝土结构耐久性设计的迫切要求下，混凝土早期开裂的防治和抑制研究显的尤为重要。本文针对厦门市商品混凝土的发展现状，对商品混凝土的组成材料和用量进行甄选，优化设计混凝土的配合比，以实现裂缝控制目标。 本文首先概述了商品混凝土的收缩变形与开裂问题，分析了混凝土裂缝产生的原因和基本形式，对其形成机理进行了详细的阐述。 通过胶凝材料体系环约束试验和混凝土圆环试...As massive infrastructures are being constructed in our country, more and more concrete is needed. Ready-Mixed concrete, with the characteristics of professional production, accurate quality control, civilization and advantages of rapid construction , is widely used in civil engineering in our country. Because of mobility, cementitious materials consumption, more sand be used in Ready-Mixed concre...学位：工学硕士院系专业：建筑与土木工程学院土木工程系_结构工程学号：2532008115180

海工高耐久自密实混凝土的研制

针对跨海桥梁工程特点与环境条件,采取七元组分设计混凝土配合比,通过限制骨料含量、采用低水胶比、复掺磨细矿粉与Ⅰ级粉煤灰以及外掺聚羧酸系高性能减水剂等技术措施,配制出适合海洋环境条件、中等强度等级、具有良好体积稳定性的高耐久自密实混凝土

外加剂对混凝土抗裂性能影响的试验研究

通过圆环试验,研究了4种常用减水剂和UEA膨胀剂对混凝土收缩开裂的影响。结果发现:聚羧酸系和萘系高效减水剂对净浆开裂龄期均有延缓作用,但影响规律却不尽相同。随着聚羧酸系减水剂掺量的增多,试件开裂龄期逐渐缩短,抗裂性能下降;而随着萘系减水剂掺量的增多,试件开裂龄期逐渐增长,抗裂性能提高。UEA膨胀剂在6%～12%范围的等量内掺,有明显的减缩作用

商品混凝土强度等级与氯离子扩散系数的对应关系研究

采用RCM法,对不同强度等级、外掺不同减水剂的商品混凝土的抗氯离子渗透性能进行了试验研究。研究发现,现阶段商品混凝土生产企业普遍对混凝土的耐久性重视不够,所配制的商品混凝土虽然满足工作性能和强度等级要求,然而耐久性只能满足一般环境要求,不能满足沿海工程等有严重侵蚀作用的环境要求。运用数学分析方法,得到了外掺2种不同减水剂系列的商品混凝土强度等级与氯离子扩散系数的关系式。结果表明:商品混凝土的氯离子扩散系数随着强度等级的提高而相应减少,两者之间存在着线性关系;相对于萘系高效减水剂而言,掺入聚羧酸系高性能减水剂对混凝土各方面的改性效果更优

Determination of Microamouts of Ammonia in Meat by Nessler's Reagent Spectrophotometry

本文提出了一种测定肉中粗氨的方法,可用于肉品新鲜度的检验。在常温下,纳氏试剂与肉中粗氨反应生成淡红棕色胶态化合物,最大吸收波长为400nm,表观摩尔吸光系数为1.404×104L/mol·cm,线性方程为y=0.52x+0.0001,r=0.9997,线性范围为0～1.0μg/ml,回收率在97.8%～104.8%之间。A method for the determination of the crude ammonia in meat was presented in this paper. The method based on the color reaction of ammonia-Nessler's Reagent in room temperature. The results showed that the apparent molar absorptivity is 1.404 ×104 L/mol·cm at the wavelength of 400nm. Beer's law is obeyed for the ammonia in the range of 0～1.0 μg/ml. The correlation coefficient is 0.9995. The recovery rate is 97.8%～104.8%. The method has been applied satisfactorily to crude ammonia in meat.福建省科技计划重点项目(2004Y012

Simultaneous Determination of Residues of Organochlorine and Pyrethroid Pesticides in Tea by Microwave Assisted Extraction Solid Phase Microextraction-Gas Chromatography

建立了微波辅助萃取-固相微萃取-气相色谱(MAE-SPME-GC)同时测定茶叶中六六六(α-BHC,β-BHC,γ-BHC,δ-BHC 4种异构体)、滴滴涕类(DDD,DDE,o,p′-DDT,p,p′-DDT)、氯氰菊酯(cypermethrin)和氰戊菊酯(fen-valerate)等10种农药残留的方法。采用外标法定量,除氰戊菊酯外,农药的质量浓度与其色谱峰面积在一定范围内有较好的线性关系,相关系数为0.970 5~0.998 4。10种组分的加标回收率为64%~121%,相对标准偏差为10.4%~22.9%,检测限为1~50 ng/L。应用该方法测定了市场上3种茶叶中上述农药残留的含量。The issue of residues including organochlorine and pyrethroid pesticides in tea has made a great attention of researchers and customers in the world.Although some analytical methods have well been established to detect these pesticides,the sample preparations are generally laborious,time-consuming,and some of the procedures caused environmental pollution.Solid phase microextraction(SPME) is a novel sample preparation technique since it is of simplicity,high efficiency and solvent free.SPME was firstly developed to address the need to facilitate environment monitoring.In recent years,great efforts have been made in the analysis of pesticide residues in agricultural products by SPME.In this research,a microwave assisted extraction solid phase microextraction-gas chromatography(MAE-SPME-GC) was applied for the simultaneous determination of organochlorine and pyrethroid pesticides,such as benzene hexa chlorides(α-BHC,β-BHC,γ-BHC and δ-BHC),1-(2-chlorophenyl)-1-(4-chlorophenyl)-2,2,2-trichloroethane(o,p′-DDT),2,2-bis(4-chlorophenyl)-1,1-dichloroethylene(DDE),2,2-bis(4-chlorophenyl)-1,1-dichloroethane(DDD),2-(2-chlorophenyl)-2-(4-chlorophenyl)-1,1,1-trichloroethane(p,p′-DDT),cypermethrin and fenvalerate.All the tested pesticides were baseline separated under the experimental conditions,except for DDD and o,p′-DDT.The concentration of each pesticide was calibrated by external standard method.The linearities were found to be in the correlation coefficient range of 0.9705 to 0.9984 for the tested pesticides between the mass concentrations and peak areas,except for fenvalerate.The recoveries,relative standard deviations and detection limits for the 10 pesticides were 64%-121%,10.4%-(22.9%,) and 1-50 ng/L,respectively.The proposed method was successfully applied to the determination of organochlorine pesticide residues in three kinds of teas from the local market.The experimental results demonstrated that MAE-SPME-GC was a fast,sensitive and green technique for the analysis of trace quantity of pesticides in solid substrate foods.福建省科技计划项目(2005I-030,2006Y0026

光催化降解三氯杀螨醇的研究

利用悬浮纳米TiO2体系,研究了三氯杀螨醇在紫外光作用下的降解行为.结果表明,在波长为365nm的400W高压汞灯,TiO2浓度为0.25mg/mL,空气流量为100mL/min的条件下,2h内可完全降解三氯杀螨醇,表观降解速率常数为0.167min-1.讨论了光催化剂TiO2的用量、光降解时间和光强等条件对三氯杀螨醇降解的影响,同时对光催化降解三氯杀螨醇的反应机理进行了初步的探讨,提出了可能的降解途径.教育部新世纪优秀人才支持计划(批准号:2005-I-030);; 福建省科技计划(批准号:2006Y0026)资助项

Ⅰ级粉煤灰对水泥净浆开裂的影响

采用环约束法,试验研究了Ⅰ级粉煤灰对不同水胶比下水泥净浆开裂的影响。试验研究发现:Ⅰ级粉煤灰在低水胶比(0.24)情况下对净浆开裂几乎没有影响,当水胶比为0.32和0.40时抗裂作用明显;较高水胶比(0.32、0.40)情况下,Ⅰ级粉煤灰对净浆的抗裂性能有较好的改善作用,在20%～65%掺量范围内,随着掺量的增大,净浆的开裂龄期延长,抗裂性能提高