The Development and Wastewater Treatment Research of New Developed Flat sheet Membrane Bio-Reactor

随着全球水资源问题的日益突显，废水回用技术是近期的研究重点。膜生物反应器作为新一代的废水处理技术具有良好的发展前景。但是由于膜造价、膜污染以及运行费用高昂等问题阻碍着膜生物反应器的广泛应用。本文主要的研究目的是研发新型的平板膜生物反应器，采用亲水性PES膜材料，拥有更好的抗污染性和耐化学性；采用层压技术实现膜片的自支撑无需外加板框，极大的提高了系统的填充密度同时允许反冲洗。本文通过实验测试该研发可反洗平板膜生物反应器的性能；通过中试对比试验验证反洗工艺对膜污染的控制的影响；最后，在工业化设备中使用该膜生物反应器处理市政废水，并对反洗工艺进行调整，采用化学增强反洗工艺，实现对整个工艺的优化。实验...With the development of global clean water scarcity, the wastewater reclamation technology is becoming more and more important. Membrane Bio Reactor (MBR) as the new generation wastewater treatment technology has great development prospects. However, membrane cost, membrane fouling and high operation cost become the three major factors that hindering the wider application of MBR. The main purpose ...学位：理学硕士院系专业：材料学院材料科学与工程系_高分子化学与物理学号：2072006115206

国有资本分级所有与政府分级财政

由厦门大学财政系提供的2003年国有资产监管体制与公共财政制度改革国际会议论文集10本文首先阐述了改革我国有资产监管体制的必要性，强调建立公共财政的分级所有制，并论述了两者的关系，指出要以国有资本为经济基础，充分发挥财政在国有资本与非国有资本中的导向作用。提出了完善国有资本管理体制的措施,主张将中央统一所有的管理格局,改革成为中央与地方分级所有的多层次管理体制,实现管资本和管人、管事相结合,权利、义务和责任相平衡

可反洗平板膜生物反应器处理园区生活污水研究

就可反洗平板浸没式膜生物反应器和传统平板浸没式膜生物反应器处理园区生活污水的效果进行比较研究,发现在水力停留时间同为9.6h的条件下,两者几无区别,COD和NH3-N的去除率同样分别为90%和95%,浊度均降至0.7NTU以下,也均无SS检出,出水水质都达到国家生活杂用水水质标准(GB/T18920-2002);但前者因膜具可反洗性,可以延缓膜污染,延长系统稳定运行周期,减少化学清洗频率,既降低运行成本,延长膜使用寿命,又减少化学清洗剂对环境的污染

Optimized combination detection for microwave ceramic dielectric resonator measurement

[中文文摘]微波介质陶瓷材料的介电性能主要由3个参数表示:介电常数、介质损耗和谐振频率温度系数。本文优选组合了3种检测介质谐振器方法:短路型介质谐振器轴向的短路界面测定方便准确,用于测量微波介质陶瓷材料的相对介电常数;开路型平行板与介质谐振器无直接接触,用于测量介质损耗系数;自行研制的旋转开放腔,可同时放置多个样品,加快温度系数的测量速度。3个参数采用3种不同测试法,充分应用了不同测试法各自的优势,满足微波介质陶瓷材料介电常数跨度大、介质损耗低、温度系数快速测量的需求,可得到精确、快速的测试效果。[英文文摘]Dielectric p roperties of microwave dielectric ceramic material are featured in three parameters: comp lex permittivity, dielectric loss and temperature coefficient of resonant frequency. In this paper, a short-circuited resonatormethod is developed to measure the comp lex permittivity of a microwave dielectric material; an open - circuited parallel p late resonatormethod is developed to measure the dielectric loss due to the fact that the dielectric resonator does not contact the open parallel plates physically; the temperature coefficient of the resonant frequency is efficiently measured in a rotary open resonator cavity designed by ourselves. All the parameters are measured p recisely and efficiently by taking the respective advantages of short2circuited and open2circuited methods to satisfy the specific measurement requirements of microwave dielectric material.国家863计划(2001AA325100) 、福建省自然科学基金(11081087) 、厦门大学创新基金(70009)资助项

KINETIC EXPONENTS OF GRAIN GROWTH IN (Ba_(0.9)Sr_(0.1))(Ti_(0.999)Nb_(0.001))O _3 CERAMICS

[中文文摘]研究了半导化 (Ba0 .9Sr0 .1 ) (Ti0 .999Nb0 .0 0 1 )O3 陶瓷晶粒生长的动力学因子 ,采用固相反应法工艺制备该陶瓷样品 ,化学原材料为纯度高于 99%的BaCO3,SrCO3,TiO2 和Nb2 O5 等 ,并用到微量原料Al2 O3 和MnSiO3 以改善陶瓷的电学性能 .同样化学配方的 8种样品在130 0℃中保温时间分别为 1,3,6 ,10 ,30 ,6 0 ,10 0和 30 0min ,以获得晶粒生长不同程度的块状陶瓷 .利用扫描电子显微技术分析发现 ,随着保温时间的延长样品的平均晶粒尺寸变大 .经自动图像处理技术发现 ,晶粒生长的动力学因子不是常数 :在烧结初期大致为 1.5 ,而在烧结后期为 3.5 .这与大多数报道的实验和模拟结果一致.[英文文摘]In this work, the kinetic exponents of grain growth in (Ba 0.9 Sr 0.1 )(Ti 0.999 Nb 0.001 )O 3 ceramics were investigated. The samples of BST ceramics were produced by the conventional ceramic processing, the solid_state reaction method. Raw materials, BaCO 3, SrCO 3, TiO 2 and Nb 2O 5, are used, with chemical purity of higher than 99 % (in mass). In addition, two minor chemicals, Al 2O 3 and MnSiO 3, are incorporated to enhance the electrical properties of resulting ceramics. After weighed according to a required composition , the chemicals were ball-milled with purified water for about 20 h and calcined at 1 200 ℃for 2 h. They are then ground and milled again with polyvinyl alcohol ( PVA) solution binder , and , spray- dried for granulating. The dried powders are hydropressed into pellets and sintered at 1 300 ℃ for different holding times , to obtain bulk ceramics with different degrees of grain growth. It was observed by SEM that the average grain diameters became larger with the increasing of soaking time. It is found that the kinetic exponents , obtained by an automatic image processing technique , are not a constant , about 1. 5 at the early stage and 3.5 at the later period of grain growth. This is in good agreement with most of experimental and simulated results reported.香港RGC资助!项目 (97-0235

Development of Microwave Dielectric Materials and Its Applications

[中文文摘]详细论述了微波介质材料与器件国内外现状和技术发展趋势, 分析了应用前景和国内市场需求,对我国“十一·五”发展方向和重点研究课题提出了建议。[英文文摘]Presented are the histores, recent situation and development of microwave dielectric materials and its applications. The communication market, research and production of the microwave dielectric materials and devices in China and the solutions are discussed

Transformation of Populus Tomentosa by Agrobacterium and Regeneration of Transformed Plantlets

本文报道农杆菌转化毛白杨的高效遗传转化系统的建立。所用农杆菌菌株为：1.发根农杆菌R1000，含有Ri质粒pRiA4b。2.发根农杆菌R1000(pTVK85)，是菌株R1000中除含有pRiA4b外，并兼容一个带有超致病区(Supervirulent region)的质粒pTVK85。3.根癌农杆菌C58C1(pBZ693)，其质粒pBZ693是改建过的Ti质粒，载有T-DNA的基因1和基因2。将毛白杨外植体分别与上述菌株在MS+0.5ppm激动素培养基上先培养2天后，转移至MS+500ppm氨噻肟头胞霉素的培养基上。一个星期后即有根从外植体上产生。根癌农杆菌诱导的根形态明显与发根农杆菌诱导的根不同。R1000(pTVK85)诱导生根的外植体可占供试外植体总数的59%。转化的根有的可自发地形成不定芽或愈伤组织。通过培养基中激素的调整，可使转化的根系统100%再生出不定芽，并可由这些不定芽得到完整植株。转化植株的各克隆之间表型差异很大。有的地上部形态正常，仅根系与未转化植株有所不同。有的节间短、叶片多、顶端优势弱、根系发达而多发枝、多根毛。但所有转化植株皆无皱叶现象，其叶片形态与正常植株无异。普遍地有根生于植株的培养基平面以上部分的现象。取三个克隆的植株进行Southern杂交，其中两个为杂交阳性，表明确已被转化；另一个克隆为杂交阴性

survey of web services access control model

本文分析了Web服务给访问控制带来的挑战性问题,包括跨域的访问控制、动态授权和标准化问题等.然后,根据访问控制模型的决策依据,对现有的访问控制模型进行了分类研究.介绍了各类模型的基本原理,分析了它们解决Web服务访问控制挑战性问题的能力.最后,对Web服务访问控制模型研究的方向进行了讨论