The Ordered Metal Clusters on Surfaces: Electronic Properties and Structural Stabilities

摘要 表面上有序排列的金属团簇在超高密度磁性记录，新一代微电子学以及表面催化中都有非常重要的应用前景。近年来，该领域的实验有了很大的进展，通过“模板＋幻数稳定团簇”的方法，人们已经在材料的表面上生长了尺寸相同、空间分布均匀的多种金属团簇。于是，从理论上仔细地研究衬底－团簇以及团簇－团簇的相互作用对理解表面上团簇的形成以及相关的物理化学性质有重要的意义。本论文使用第一原理计算方法研究幻数金属团簇Nb4二维有序排列在金属Cu(111)、Cu(100)表面、半导体GaN(0001)表面和绝缘体NaCl(100)等表面上的结构稳定性和电子性质，获得一系列重要结果。 我们的计算结果表明：四面体和菱形...Abstract The ordered arrays of identical metal clusters on surfaces have very important applications in the ultrahigh density recordings, next-generation micro-electronics and surface catalysis. In recent years, experimentally, the ordered arrays of several kinds of metal clusters have been successfully fabricated on semiconductor substrate, using the “module + the magic cluster” method. Therefor...学位：理学博士院系专业：物理与机电工程学院物理学系_理论物理学号：B20042400

论迪士尼公主系列中的女性崛起

自1937年迪士尼推出全球第一部动画长片,亦即迪士尼公司第一部公主系列电影《白雪公主和七个小矮人》,到2013年《冰雪奇缘》问世,迪士尼迄今已经制作了12部公主系列动画电影。作为社会生活和时代背景的风向标,电影不可避免地带有当时社会价值取向和意识形态的时代烙印,而随着迪士尼公主形象近80年的变迁,我们不难从中发现一条清晰的脉络——女性形象的崛起。本文将从公主群像的梦想及爱情模式的角度,试图构建迪士尼公主形象的80年时代变迁,探索女性意识的觉醒及女性地位的不断提升

Optimized analysis of precision grinding machine bed based on neural network

变形和固有频率是评价精密机床结构刚性的重要参数。为了提高磨床的整体刚性,提出一种利用bP神经网络来优化精密磨床床身结构的方法。以自主开发的高精度平面磨床2Mk1760为研究对象,利用有限元分析软件AnSyS对床身进行静力分析和模态分析。为了减小精密磨床的变形和振动,将部分关键参数作为神经网络的输入,以此预计床身尺寸参数与变形量和固有频率之间的关系,从而获得磨床床身的优化尺寸。分析结果表明,通过神经网络优化后的床身变形量相比初始结构减小了36.51%,而固有频率增加了11.96%。Deformation and inherent frequency are key parameters to evaluate structure rigidity for precision machine tool.In order to improve rigidity for grinding machine,this study proposes a method that using neural network to optimize the structure of precision grinding machine bed.Take precision grinding machine tool( 2MK1760) which is self developed for an example,the static structure and dynamic modal analysis is carried out by using finite element method( ANSYS).In order to alleviate the influence of deformation and vibration on precision grinding machine bed,some parameters are served as input of BP neural work model,which estimate the relationship between deformation and inherent frequency.According to analysis results,an optimization is obtained to determine the dimension of precision grinding machine bed.The results indicate that the deformation after neural network optimization compared with initial structure has decreased by 36.51%,meanwhile,the natural frequency has increased by 11.96%.国家自然科学基金项目(51075343); 福建省自然科学基金项目(2012J05102

鳗鲡的营养需求研究与配合饲料质量评价

鳗鲡(AnguIllASP)是鳗鲡属鱼类的统称,在分类学上隶属于硬骨鱼纲(OSTEICHTHyES)、鳗鲡目(AnguIllI-fOrMES)、鳗鲡科(AnguIllIdAE)、鳗鲡属(AnguIllA),为肉食性鱼类,广泛分布于全球热带、亚热带和温带地区,其公益性行业(农业)科研专项(nyhyzx07-043)部分资

超声速壁面凹腔自激振荡的数值研究

数值研究了冷态及化学反应流动情况下超燃冲压发动机中壁面二维凹腔火焰稳定器流场的非定常特性。模拟了凹腔剪切层的演化发展过程，并得到凹腔诱导的超声速流场振荡的频谱分布，计算凹腔上游有燃料射流和有化学反应的工况并对比分析其影响。并结合计算结果阐述了超声速凹腔流动的周期特性和稳焰作用机理。无射流情况下得到的振荡频率和Rossiter 预测结果一致，添加射流使剪切层升高且厚度增加，涡合并过程更充分，同时压力振荡幅度增大，频率减小。有化学反应情况下，释热的作用使剪切层进一步被托高，厚度进一步增大

The Application of Duo-Core Architecture in Wireless Sensor Network Nodes

研究了采用超低功耗监控微控制器和高性能微处理器相结合的双核架构的无线传感器网络节点的实现。通过选用合适的芯片,从硬件上构建了基于双核架构节点的无线传感器网,基于APTEEN网络路由协议,根据实验环境将层次结构简化为平面结构,并进行了性能测试,将测试结果与现有的基于单核架构节点的的无线传感器网进行比较。结果表明双核架构在低功耗和高性能之间取得了平衡点,相对于单核结构具有以更低的功耗获取更高性能的优势。An ultra-low power monitoring microcontroller and a high performance microprocessor are used to realize a duo-core architecture in wireless sensor network nodes, and APTEEN network routing protocol is modified from the hierarchical structure to the plane structure under given experimental conditions. The wireless sensor network is built up and tested. The results show that compared with the existing single-core architecture in wireless sensor network nodes the new dual-core architecture nodes can easily realize fast data sampling and transmitting, therefore the sleep cycle of the entire wireless sensor network is greatly increased and power consumption greatly reduced.厦门大学引进人才科研启动基金资助(0000-X07191

The Determination of Polycyclic Aromatic Hydrocarbons in Sediments with ASE/GC-MS

建立了用加速溶剂萃取技术提取含硫沉积物中痕量多环芳烃的可靠方法,优化了不同萃取剂,不同提取程序等萃取条件,研究了沉积物中的硫化物对色谱分离的影响。15种多环芳烃的检出限为0.09~1.34ng/g,相对标准偏差(RSD,n=6)为12.5%~23.9%,15种多环芳烃的低浓度加标回收在74%~138%之间。高浓度加标回收率除吲哚芘为62%外,其余都在80%~122%之间。基本上达到了痕量分析的要求。用该方法分析山东半岛近岸海域沉积物中多环芳烃的含量,测得15种PAHs的总量为273~579 ng/g。与其它地区沉积物中多环芳烃含量相比,属轻/中度污染。An accelerated solvent extraction method for the extraction of polycyclic aromatic hydrocarbons(PAHs) in sediments was developed.The extraction conditions such as extraction solvent and program were optimized.The effects of sulfide on chromatographic separation were studied.The detection limits for the fifteen PAHs were 0.09-1.34 ng/g,and the relative standard deviations(RSDs) ranged from 12.5% to 23.9%.The recoveries of high level concentration ranged from 62% to 122% and those of low level concentration ranged from 74%-138%.The contents of PAHs in sediment samples collected in the coastal regions off the Shandong peninsula,China were analyzed by this method.The PAHs in these samples ranged from 273 ng/g to 579 ng/g.Overall,the PAHs levels were comparable to those reported in the literature for sediment samples collected from similar environments around the world.国家高技术研究发展计划(863)基金项目(2003AA635180);; 青岛科技将才计划基金项目(04-3-J.J-11

Effects of Heavy Metal and Pollutants on the Non-special Immunity of the Shrimp and Crab

综述了近10a国内外有关重金属、氨态氮、亚硝酸盐、有机污染物等几种环境因子对虾蟹类非特异性免疫影响的研究成果,以期为通过改善养殖环境条件提高虾蟹类自身免疫抗病力提供理论依据。同时,为进一步深入开展该领域的研究工作积累资料。This paper attempted to review and evaluate existing information about the effects of heavy metal,ammonia-N,nitrite and the organic pollutants on the non-special immune response of the shrimp and crab,which providing theory for improving the self-immunity of shrimp and crab by meliorating cultural environment. In addition,it could provide information for further study on this field

固相微萃取-气相色谱-质谱联用测定海水和沉积物间隙水中的痕量多环芳烃

建立了固相微萃取(SPME)与气相色谱-质谱(GC-MS)联用同时测定海水中16种多环芳烃的分析方法,研究了萃取时间、盐度条件的影响．同时用SPME的方法研究了海水中的溶解有机物(DOM)对多环芳烃萃取的影响．计算出不同DOM浓度下多环芳烃KDOM与KOW的关系: CDOM=5 mg／L时,logKDOM=0．7944KOW+0．773(R2=0．91)．CDOM=10 mg／L时,logKDOM= 0．7905KOW+0．668(R2=0．97);CDOM=30 mg／L时,logKDOM=0．714KOW+1．0407(R2=0．91)．该法对16种多环芳烃的检出限为0．1-3．5 ng／L,相对标准偏差(RSD,n=5)为4％-23％．用该法分析海洋环境中的痕量多环芳烃,16种多环芳烃的平均回收率为88.2±20．4％,方法快速、灵敏、简单,适用于快速分析海水和沉积物间隙水样中的痕量多环芳烃．国家高技术研究发展计划(863)(批准号:2003AA635180);; 青岛科技将才计划(批准号:04-3-JJ-1)资助项

我国科技期刊媒体融合制约因素及突破路径探析

目的 分析并探讨我国科技期刊媒体深度融合的制约因素及突破路径。方法 通过文献调研、案例分析与对比,基于政策导向、专家意见及期刊现实情况,对期刊的发展现状进行归纳与分析。结果 系统梳理了制约我国科技期刊媒体融合的4个主要因素,提出可从5个方面进行融合转型升级路径探索。 结论 制约我国科技期刊媒体融合的因素主要包括管理机制与相关政策、人才与团队构建、先进技术与内容产品、发展资金等。要实现科技期刊与新媒体的深度融合,应坚持&ldquo;五位一体&rdquo;的融合路径:坚持正确的理念、思维及意识;组建&ldquo;领军人才+专才&rdquo;的团队或联盟;构建立体化网络平台与全媒体产业链,形成传播媒体矩阵;用技术外包实现近期内容创新,同时加大技术自主研发力度,以掌握深度融合的主动权;管理运营要注重顶层设计、资源有效配置、利用最大化,促进科技期刊事业的可持续发展。</p