Influence of Surface Stress on Frequency of Microcantilever-Based Biosensors (vol 10, pg 307, 2004)

Microcantilever-based biosensors have been found increasing applications in physical, chemical, and biological fields in recent years. When biosensors are used in those fields, surface stress and mass variations due to bio-molecular binding can cause the microcantilever deform or the shift of frequency. These simple biosensors allow biologists to study surface biochemistry on a micro or nano scale and offer new opportunities in developing microscopic biomedical analysis with unique characteristics. To compare and illustrate the influence of the surface stress on the frequency and avoid unnecessary and complicated numerical solution of the resonance frequency, some dimensionless numbers are derived in this paper by making governing equations dimensionless. Meanwhile, in order to analyze the influence of the general surface stress on the frequency, a new model is put forward, and the frequency of the microcantilever is calculated by using the subspace iteration method and the Rayleigh method. The sensitivity of microcantilever is also discussed. (19 refs.)

中国科学院力学研究所2004年科研工作总结与思考

2004年，力学所以国家科技中长期规划和中国科学院中长期科技发展规划的制定为牵引，以筹划进入中科院院“三期”创新、争取承担“十一丑，国家和中科院重大科研项目为动力，持续、多层面地进行了研究所发展规划的论证．在此基础上提出了发展蓝图，即6个主要的学科方向（微重力科学和空间技术、高温气体动力学与跨大气层飞行、微尺度力学与微系统、工艺力学与材料设计、海洋与环境工程、生物力学与生物工程），4个科研平台（微重力科学平台、高超声速飞行技术平台、微／跨尺度力学平台、海洋工程研究平台）包含的基本科学问题是复杂介质和极端条件下的力学行为． 2004年，力学所成功主办了以“第24届世界激波大会”、“第六届世界计算力学大会”（联合）为代表的3次大型国际会议；郑哲敏院士当选工UTAM执委．这是力学所不断提升和国内外学术交流的深入和广泛程度的具体体现．

丝绸之路上的古代玻璃研究: 2004年乌鲁木齐中国北方古玻璃研讨会和2005年上海国际玻璃考古研讨会论文集

本书首次系统地介绍了中国古代玻璃技术的起源和发展以及对外传播,并汇集了丰富的中外专家对北方(沙漠)丝绸之路,特别是新疆地区(古称西域)古代玻璃的出土历史和背景、外观特征和化学成分的研究结果,系统介绍了丝绸之路对中国古代玻璃技术和艺术发展的影响。

长江上游特有鱼类受威胁及优先保护顺序的定量分析

根据本课题组1997~2002年野外渔获物调查数据并结合相关文献资料,运用濒危系数、遗传损失系数和物种价值系数对长江上游16种特有鱼类的优先保护顺序进行了定量分析.结果表明,达到一级急切保护的有达氏鲟(Acipenser dabryanus)、鲈鲤(Percocypris pingi)2种;达到二级急切保护的有宜宾鲴(Xenocypris fangi)、齐口裂腹鱼(Schizothorax prenanti)、四川白甲鱼(Onychostoma angustistomata)及云南鲴(Xenocypris

Description of a new species of the genus Tylopharynx (Nemata : Diplogasteroidea), T-clariamphida sp n., with a redescription of T-foetida (Butschli, 1874) Goffart, 1930

Tylopharynx clariamphida sp. n. is described from muddy sand collected in Anhui Province, China. It can be distinguished from T foetida (Butschli, 1874), the type and only species of the genus, by numerous characters: having 24 to 26 prominent and clearly separated longitudinal ridges, a higher lip region with no hint of a cephalic framework, more prominent amphidial foveae in lateral view, wider and more posteriorly located amphidial apertures, smaller basal knobs of stoma, longer metacorpus, more enlarged phasmids, shorter spicules with shorter digitate terminus, shorter reflexed part of testis, and thicker gubernaculum with more angular shape. For comparison, an expanded description is given for T foetida from Belgium, and SEM photographs of both species are provided.

Fabrication of 1.55-mu m Si-based resonant cavity enhanced photodetectors using sol-gel bonding

In this work, a novel bonding method using silicate gel as the bonding medium was developed to fabricate an InGaAs narrow-band response resonant cavity enhanced photodetector on a silicon substrate. The bonding was performed at a low temperature of 350 degreesC without any special treatment on bonding surfaces and a Si-based narrow-band response InGaAs photodetector was successfully fabricated, with a quantum efficiency of 34.4% at the resonance wavelength of 1.54 mum, and a full-width at half-maximum of about 27 nm. The photodetector has a linear photoresponse up to 4-mW optical power under 1.5 V or higher reverse bias. The low temperature wafer bonding process demonstrates a great potential in device fabrication.

Upconversion emission of a Er3+-doped glass microsphere under 633 nm excitation (vol 35, pg 353, 2004)

　

半导体纳米结构物理性质的理论研究--2004年国家自然科学二等奖获奖项目介绍

半导体纳米结构是纳米材料的一个重要组成部分,纳米结构的电子和光子器件将成为下一代微电子和光电子器件的核心.半导体纳米结构有多种多样,如自组织量子点、纳米晶体、硅团簇、量子结构等,它们可以制成各种纳米电子学器件.根据以上几类半导体纳米结构,文章介绍的获奖项目提出了研究半导体纳米结构电子结构的四个理论,并利用这些理论研究了它们的电子态和物理性质,发现了许多新的效应.这些理论包括

我国半导体科学领域基础研究迈入新阶段--国家自然科学基金半导体学科2004年申请概况分析

2004年国家自然科学基金委员会半导体学科受理的面上项目申请数终于有了突破,文中介绍了2004年半导体学科基金申请与资助概况,分析半导体学科受理申请的近期动态,介绍学科拟采取的对策,并附2004年半导体学科批准资助的面上项目及重点项目,供广大科研人员参考.

1973年至2004年贵州喀斯特山区石漠化风险格局的变化——以普定后寨地下河流域中下游为例

以贵州省普定后寨地下河流域中下游为例,采用景观生态学的研究方法,利用多时相多数据源的遥感影像(1973年的航片、1995年的TM影像及2004年的SPOT-5影像),从不同等级石漠化风险的角度分析了研究区近30多年来的石漠化风险格局变化的特征,以期了解喀斯特高原山区的石漠化变化特征规律。结果表明:从景观水平上来看,整个区域的景观正在向程度更高的石漠化风险的方向发展,表现为极低度石漠化风险斑块的面积呈现出逐渐减少的趋势,而高度和极高度石漠化风险斑块的面积却呈现出不断增加的趋势;从斑块类型水平上来看,不同等级的石漠化风险斑块的变化差异明显,在变化幅度和变化趋势上都存在差异,其中极低度石漠化风险斑块面积变化最为明显,呈现出大幅度的下降,而变化最不明显的是低度石漠化风险斑块,无明显的增减趋势。