48 resultados para Schramb, Anselm, 1658-1720.

em Chinese Academy of Sciences Institutional Repositories Grid Portal


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通过数值计算,研究了高水分煤在流化床中燃烧时NO的排放特性及其形成的主要影响因素。结果表明煤中的水分,床内的CO浓度和空-燃比等都对于NO转换率有较大影响。

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Aiming at understanding how a liquid film on a substrate affects the atomic force microscopic image in experiments, we present an analytical representation of the shape of liquid surface under van der Waals interaction induced by a non-contact probe tip. The analytical expression shows good consistence with the corresponding numerical results. According to the expression, we find that the vertical scale of the liquid dome is mainly governed by a combination of van der Waals force, surface tension and probe tip radius, and is weekly related to gravity. However, its horizontal extension is determined by the capillary length.

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Micro anchor is a kind of typical structures in micro/nano electromechanical systems (MEMS/NEMS), and it can be made by anodic bonding process, with thin films of metal or alloy as an intermediate layer. At the relative low temperature and voltage, specimens with actually sized micro anchor structures were anodically bonded using Pyrex 7740 glass and patterned crystalline silicon chips coated with aluminum thin film with a thickness comprised between 50 nm and 230 nm. To evaluate the bonding quality, tensile pulling tests have been finished with newly designed flexible fixtures for these specimens. The experimental results exhibit that the bonding tensile strength increases with the bonding temperature and voltage, but it decreases with the increase of the thickness of Al intermediate layer. This kind of thickness effect of the intermediate layer was not mentioned in the literature on anodic bonding. (C) 2008 Elsevier Ltd. All rights reserved.

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对室温条件下用低能离子束沉积得到的 Ga As∶ Gd样品 ,借助 X射线衍射 (XRD)和高分辨 X射线衍射 (HR-XRD)进行了结构分析 ,结果表明没有出现新的衍射峰 ,并且摇摆曲线的形状与 Gd的注入计量密切相关 .运用 X光电子能谱仪对比分析了 Gd注入后 ,衬底中主要元素 Ga2 p和 As3d的化学位移 ,以及不同计量的样品中注入的Gd4 d芯能级束缚能的变化 ,并分析了铁磁性产生的可能原因 .

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研究了非挥发全息记录中南于紫外光的强吸收而引起的光栅非均匀性,分析了这种非均匀性对光栅衍射效率的影响。结果显示,非均匀性致使光折变光栅的平均强度减弱,衍射效率降低。提出了采用两束等光强的敏化紫外光由晶体两侧入射的优化方案以改善光栅的均匀性,提高光栅的衍射效率。通过联立两中心带输运物质方程和双光束耦合波方程,进行了相应的理论模拟,并给出实验验证。结果表明双侧紫外光照射能够实现均匀性较好的光栅,是提高衍射效率的有效途径之一。

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We report experimental and theoretical studies of nonvolatile photorefractive holographic recording in LiNbO3:Cu:Ce crystals with two illumination schemes: (1) UV light for sensitization and a red interfering pattern for recording and (2) blue light for sensitization and a red pattern for recording. The results show that the oxidized LiNbO3:Cu:Ce crystals can provide high, persistent refractive-index modulation with weak lightinduced scattering. The optimal working conditions and the prescription for doping and oxidation-reduction processing that yields the maximum refractive-index modulation are discussed. (C) 2000 Optical Society of America OCIS codes: 050.7330, 190.5330, 090.2900.

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对高斯光束在硬边孔径限制下的衍射进行了详细的理论研究,就不同口径的圆孔限制下高斯光束在菲涅耳衍射区和夫琅禾费衍射区的分布进行了理论分析,从而得到了孔径受限高斯光束的横向以及轴向的衍射公式,进而对高斯光束在不同衍射区域内衍射光场分布形状随孔径尺寸变化时的演化规律进行了数值计算,并对小口径光阑受限的高斯光束的衍射与平行光经同尺寸光阑的衍射进行了比较。结果表明在较小口径下,两者的分布基本一致。得到的孔径光阑限制下高斯光束的传输规律为高斯光束在自由空间光通信和光学超分辨中的应用提供了理论基础。

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研究了γ-辐照前后纯Y2SiO5和Eu^3+掺杂的Y2SiO5晶体吸收光谱的变化,辐照后,未退火和氢气退火的纯Y2SiO5晶体在260-270nm和320nm波段产生了附加吸收峰,分别是由F心和O^-心的吸收引起的;经过空气退火的纯YSO晶体中,由于消除了氧空位,因此辐照后没有出现色心吸收峰。在Eu^3+;Y2SiO5晶体中,不但有相同的F心和O心吸收峰,而且还有Eu^2+离子在300nm和390nm的吸收峰。随着辐照剂量的增加,色心附加吸收峰增强。空气退火能减少Eu^3+:Y2SiO5晶体中的色心,而氢

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在国家杰出青年基金和上海市科委专题项目的支持下,中国科学院上海光学精密机械研究所激光与光电子功能材料研发中心在超宽带光放大材料研究方面取得进展。

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 为探讨抚仙湖水质的诱变性及诱变因素,用蚕豆根尖细胞微核检测法,检测抚仙湖水质的诱变性。用 高灵敏度的电感耦合氩等离子体发射光谱法( ICP2AES) 检测水体中5 种诱变性离子浓度。用GC/ MS(色相色谱/ 质谱) 联机检测水体中的有机化学污染物。结果表明:抚仙湖水质具有诱变性,且呈现水域性差异;水质的诱变性 非水体中诱变性离子所致;但与水体中有机化合物的种数有显著的相关性。

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学习和记忆是神经科学研究的热点。已证实大脑中的海马、前额叶和海马-前额叶回路均参与工作记忆功能。该文对海马-前额叶回路的解剖和生理特性以及海马、前额叶和海马-前额叶回路在工作记忆中的作用的研究进展做一概述。

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采用形态度量学方法对分布于我国珠江水系、元江水系及海南岛诸水系的长臀属3种鱼类,共66尾个体的 43个测量性状进行了主成分分析。研究结果表明长臀属鱼类不能在形态上进行区别。作者认为长臀属鱼类 只存在一个有效种。

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记述了从我国江西省淡水蚌中采到的蚌螨科Unioni colidae水螨1新种,簇刺蚌螨U.(Anodontinatax)penicilla tussp.nov.,模式标本保存于南昌大学生物科学工程系。簇刺蚌螨,新种Unionicola(Anodontinatax)penicillatus sp.nov.(图1~11) 正模♂,副模1♀,江西鄱阳湖,1998 11 11,文春根采自背角无齿蚌A.woodianawoodiana(Lea)。鉴别特征新种近似于中间蚌螨U.(Anodontinatax) inte