The Study of Applying CELT to Three Dimensional Micromachining of GaAs and the Planarization of Cu Innerconnections

微机电系统、微光学系统、微芯片系统等领域的发展促进了微/纳米加工技术的发展与完善。微/纳米加工技术是当今微系统制造领域研究的热点和核心，是人类探索微纳米世界的必不可少的工具。1992年厦门大学田昭武院士提出的约束刻蚀剂层技术（ConfinedEtchantLayerTechinique，简称CELT）是一种具有距离敏感性的化学刻蚀技术，不仅能批量加工出复杂的三维微结构，而且工艺简单，适用的材料非常广泛。CELT在实验和理论方面发展了十余年，成功应用于对金属、半导体和绝缘体等材料的微加工。本论文完善和发展了半导体材料GaAs的CELT加工技术，并将CELT初步应用于超大规模集成电路Cu互连线结构...With the development of the microelectromechanical systems (MEMS), micro-optics and microchips, microfabrication technology has been developed and improved. Now, the micro-fabrication technology has become the hotspot of the research and the score of the MEMS, which is an indispensable tool to explore the micro-nano world. The Confined Etchant Layer Technology (CELT) is a potential method to fabri...学位：工学硕士院系专业：化学化工学院化学系_应用化学学号：2052007115099

网格技术在全球分布计算计划GIMPS中的应用研究

旨在寻求新梅森素数的大互联网梅森素数搜寻计划GIMPS( Grea t InternetM ersenne Primes Search) [ 1] 在网格技术的 协助下已找到第44个梅森素数。GIMPS是唯一的全球分布计算计划, 真正的虚拟组织[ 2] 。梅森素数的计算具有指数复 杂性, 随着p达千万级, 所需计算时间须以千﹑万计算机年计。本文基于梅森素数搜索历程中的原理﹑技术和算法, 探 讨网格技术给GIMPS计划带来的突破性进展。“985工程” 智能化国防信息安全技术科技创新平台项目( 0000X07204

注册会计师保密性的例外情况研究

对注册会计师保密性的例外情况作出规范，是世界各国注册会计师职业行为准则的重要内容。本文首先考察了其历史演变过程，并进行了适当的国际比较，在此基础上，提出我国注册会计师职业行为准则中应注意的十一个方面的问

Survey of location-centric target tracking with mobile elements in wireless sensor networks

介绍目标跟踪的过程以及移动跟踪的特点;通过区分目标定位为主的方法和目标探测为主的方法,介绍定位为主的移动式目标跟踪方法(称为目标的移动式定位跟踪; )的研究现状;分析和比较不同方法的特点和应用领域,发现现有方法虽然可以提高跟踪质量、降低网络整体能耗,但是还存在一些问题。基于此,总结目标的移动; 式定位跟踪方法在方法类型、网络结构和节点模型等方面可能存在的研究热点,指出其研究和发展趋势。The basic process of target tracking and the properties of tracking; solutions with mobile elements were introduced. By distinguishing; location-centric methods and detection-centric methods, the current; research status of the location-centric target tracking methods were; reviewed. The properties and application fields of different solutions; were analyzed and compared. Although the existing solutions can; significantly improve tracking quality and reduce energy consumption of; the whole network, there are also some problems. Based on these; discoveries, some possible research hotspots of mobile solutions were; summarized in many aspects, such as method types, network architecture,; node model, and so on, indicating the future direction of research and; development.国家自然科学基金资助项目; 国家科技支撑计划项

Progress of interfacial geochemistry of mercury

国家自然科学基金资助项目(20077016);; 中国博士后基金资助项目(2002032148

网格资源调度算法的负载均衡及性能分析

网格系统由大量的异构资源组成, 其目的是要实现资源的全面共享和协同工作, 因此资源调度问题已经 变得越来越重要。文章对各类经典的静态调度算法和动态调度算法进行资源调度的仿真, 并对各算法的运行结果 进行负载均衡和性能的比较分析。“985 工程”智能化国防信息安全技术科技创新平 台项目( 0000- X07204

INVESTIGATION OF SALT DAMAGE IN MANGO TREES IN XIAMEN

“叶焦病”是闽南地区芒果（Ｍａｎｇｉｆｅｒａ ｉｎｄｉｃａ Ｌ．）的一种常见病．对不同地点受害植物的叶片及土壤理化指标的分析表明：①土壤酸度、总Ｎ、总Ｐ、Ｋ、Ｎａ等含量与芒果受害程度无关；②受害程度与叶片Ｃｌ、Ｋ含量、３０—４０ ｃｍ土壤Ｃｌ含量及总盐含量呈显著正相关；③造成厦门地区芒果“叶焦病”的主要原因是盐害，其中起主要作用的是Ｃｌ；④芒果是一种对盐比较敏感的植物，土壤总盐含量达０．４８９‰时仍可正常生长，高于此含量则出现受害症状．Leaf scorch in mango (Mangifera indica L.) trees was investigated in March, 1997 in 13 sites at 30-300 m from seashore of Xiamen City. Symptom of leaf scorch in shoot leaves was divided into 6 grades. Soil properties and elements in leaves were tested. The results showed that soil pH and the total N, P, K and Na contents were not related to the leaf scorch damage. The degrees of injury caused by leaf scorch were positively related to the content of Cl and K in leaves and to the Cl and salt contents in soil at 30-40 cm depth. It is concluded that the main factor resulting in leaf scorch is salt, and Cl plays an important role. Mango trees grow normally in soil under 0.489‰ salinity

Two-dimensional materials confining single atoms for catalysis

近年来,单一原子或单一位点催化剂因其独特的结构和电子特性受到催化研究人员的广泛关注.目前,多种无机固体材料被用作限域该类单原子催化剂,包括传统的金属氧化物、沸石分子筛以及金属有机框架配合物等.载体的性质会显著地影响单原子的催化性能,因此具有独特物理化学性质的二维材料无疑是限域单原子的一类理想介质,并逐渐引起了人们在该领域的研究兴趣.二维材料兴起于石墨烯的成功剥离,随后其他类似物如氮化硼、氮化碳以及二硫化钼等蓬勃发展起来.结构简单明确且性质独特的二维材料自身就是一类新颖的催化剂,其与单原子的结合将会为催化带来更多新的可能.二维材料限域单原子催化剂的潜在优势如下:(1)二维材料独特的电子结构对单原子中心的电子特性有显著的调变作用,使其催化性能更为独特;(2)二维材料通常具有巨大的比表面积,这允许其锚定更多的单原子从而显著提高其活性位密度;(3)单原子层二维材料有利于反应物分子从双向接触其表面限域的单原子位点,增加碰撞几率并降低传质阻力;(4)二维材料限域单原子催化剂可被视为理想的模型催化剂,其结构均一的活性中心有利于催化剂构效关系的研究;(5)二维材料限域的单原子能够反过来促进或激活二维材料的本征催化活性.在这里,我们总结了二维材料限域单原子催化剂的最新进展,其中二维材料主要涉及石墨烯、氮化碳和硫化钼.我们围绕在二维材料限域单原子催化剂中什么是真正的活性位点及其如何协同催化等问题进行了讨论,进而展望了二维材料限域单原子催化剂的应用前景和挑战.[无可用摘要]Ministry of Science and Technology of China [2016YFA0204100,; 2016YFA0200200]; National Natural Science Foundation of China [21573220,; 21621063]; Key Research Program of Frontier Sciences of the Chinese; Academy of Sciences [QYZDB-SSW-JSC020]; Strategic Priority Research; Program of the Chinese Academy of Sciences [XDA09030100

Study of the Photovoltaic Properties of Tin Oxide/Porous Silicon/Silicon

测量了二氧化锡（SnO2）/多孔硅（PS）/硅（SI）的光电压谱，分析表明：在SnO2/PS/SI材料中存在着两个异质结；当样品吸附还原性气体时，其光电压明显下降。当样品在1%液化石油气的氛围时（相对于空气），光电压减少了16.4%-27.5%；在1%CO氛围时，减少了8.1%-19.4%；在1%H2氛围时，减少了12.1%-14.9%，因此SnO2/PS/SI可作为一种新的敏感元件。文中还对测量结果进行了讨论分析。The photovoltage spectra of Tin Oxide/Porous Silicon/Silicon(SnO2/PS/Si)have been studied.It is shown that there exist two heterojunctions inSnO2/PS/Si structure.The photovoltage decreases evidently when the sample absorbes reducing gas.The photovoltage decreases by 16.4-27.5 percent when theabsorbed gas contains 1 percent liquiFied petroleum, by 8.1 19.4 percent when thesample absorbes gas with 1 percent CO,and by 12.1-14.9 percent when the sample absorbes gas with 1 percent H,.The experimental results indicate that SnO2/PS/Si is a good material For gas sensor.The mechamism For the gas absorption ofSnO2/PS/Si is discussed.国家和福建省自然科学基

Study on Existent Form of Mercury in Sediments of Miyun Reservoir,Beijng

在改进Tessier方法的基础上,利用冷原子吸收对北京密云水库沉积物中汞的形态进行研究,发现密云水库沉积物的总汞含量较高,沉积物中的汞主要以气态汞、有机汞和硫化物汞的形式存在,生物可以直接利用的汞较低,但一些目前不能直接利用的汞在一定条件下可以转化为可利用的汞,需要对此加以关注。On the bases of modified Tessier method,the existent forms of mercury in sediments of Miyun reservoir,Beijing were determined with cold vapor atomic absorption(CVAA).The results showed that total mercury in the sediments is high,and that gaseous mercury,organic mercury and sulfide mercury(residual mercury) are the main form of mercury.Most of them can not be used by biomass,but,what should be noted is that some unusable mercury can be transformed usable mercury under special conditions..国家自然科学基金(20077016);; 中国博士后基金(2002032148);; 厦门大学行动计划联合资助项