利用倒装焊技术制作氮化镓基激光器管芯的方法

Submitted by zhangdi (zhangdi@red.semi.ac.cn) on 2009-06-04T08:36:34Z No. of bitstreams: 1 dspace.cfg: 33388 bytes, checksum: ac9630d3fdb36a155287a049e8b34eb7 (MD5)

同一半导体芯片不同周期全息光栅的制作方法

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自适应型偏置可变增益低噪声放大器的自动反馈控制方法

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单相钆硅化合物以及制备方法

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制备绝缘体上锗硅薄膜材料的方法

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一种制备三元高K栅介质材料的方法

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一种产生超短光脉冲的单片集成器件的制作方法

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在硅衬底上生长氮化镓自支撑衬底材料的方法

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利用密封石英玻璃管实现不同材料晶片键合的方法

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应变调制掺杂法制备P型氧化锌半导体薄膜材料的方法

Submitted by zhangdi (zhangdi@red.semi.ac.cn) on 2009-06-04T08:36:34Z No. of bitstreams: 1 dspace.cfg: 33388 bytes, checksum: ac9630d3fdb36a155287a049e8b34eb7 (MD5)

利用离子束外延生长设备制备氮化铪薄膜材料的方法

Submitted by zhangdi (zhangdi@red.semi.ac.cn) on 2009-06-04T08:36:34Z No. of bitstreams: 1 dspace.cfg: 33388 bytes, checksum: ac9630d3fdb36a155287a049e8b34eb7 (MD5)

利用离子束外延生长设备制备氮化锆薄膜材料的方法

Submitted by zhangdi (zhangdi@red.semi.ac.cn) on 2009-06-04T08:36:34Z No. of bitstreams: 1 dspace.cfg: 33388 bytes, checksum: ac9630d3fdb36a155287a049e8b34eb7 (MD5)

Ultra-broadband optical parametric chirped-pulse amplification by matching of both group-velocity and pulse-front

Ultra-broadband optical parametric chirped-pulse amplification is analyzed based the compensation of phase-mismatch, which is achieved by matching of both group-velocity and pulse-front between signal and idler by the combination of the noncollinear-phase-match and pulse-front-tilt. The results show exactly matching of both group-velocity and pulse-front is the important criterion for constructing an UBOPCPA. Its general model is developed, in which the group velocities, noncollinear angles. spatial walk-off angles, linear angular spectral dispersion coefficients and pulse-front tilted angles are suitably linked to each other. Finally, specific numerical calculations and simulations are presented for beta-barium borate OPCPA with type-1 noncollinear angularly dispersed geometry. (C) 2005 Elsevier B.V. All rights reserved.

Optimization and comparison of single- and dual-pump fiber-optical parametric amplifiers with dispersion fluctuations

Solutions for fiber-optical parametric amplifiers (FOPAs) with dispersion fluctuations are derived using matrix operators. On the basis of the propagation matrix product and the hybrid genetic algorithm, we have optimized and compared single- and dual-pump FOPAs with zero-dispersion-wavelength variations. The simulations prove that the design of FOPAs involves multimodal function optimization problems. The numerical results show that dual-pump FOPAs are highly sensitive to dispersion fluctuations whereas dispersion variations have less impact on the gain of single-pump FOPAs. To increase signal gain and reduce ripple, dual-pump FOPAs, instead of single-pump FOPAs, have to be carefully optimized with a suitable multisegment fiber structure rather than a one-segment fiber structure. The different combinations of multisegment fibers can provide highly different gain properties. The increase in gain is at the cost of the ripple.

功能化线性低密度聚乙烯的制备、反应机理

功能化线性低密度聚乙烯的制备、反应机理及动力学研究 学生：石强（高分子化学与物理） 导师：殷敬华 研究员 摘 要 采用反应挤出接枝方法改性聚烯烃已有近半个世纪的历史，但人们对挤出机内发生的物理变化和化学反应尚未有规律性的认识，迄今为止，尚未发现熔融反应挤出接枝反应速率常数的研究报道。本文以室温下空气中经电子束预辐照的LLDPE为接枝基底，以丙烯酸、甲基丙烯酸、甲基丙烯酸甲酯为接枝单体，首先制备了功能化LLDPE材料；随后，利用红外光谱（FTIR）、核磁光谱、电子自旋共振波谱（ESR）等实验手段，系统的研究了反应挤出接枝过程的反应机理和接枝（均聚）反应动力学；最后，使用FTIR和ESR相结合的办法，首次成功的测量了LLDPE接枝反应的链增长反应速率常数。 研究表明： 1．螺杆中的接枝（均聚）反应速度很快，大部分产物在第二捏合段之前形成；接枝（均聚）反应呈现两个阶段：线性增长阶段和近似平台增长阶段，单体浓度的变化是第一阶段向第二阶段转化的主要原因；2．接枝反应同时存在偶合终止和接枝链向聚合物链转移终止反应，单体加成到大分子自由基上是一步慢反应，起始均聚反应遵循经典的自由基聚合机理；3. 链增长速率常数基本上不随熔体粘度和起始单体浓度的改变而改变；均聚链增长反应速率常数, kp,h总是大于相应温度下接枝反应速率常数, kp,g; 4. 在起始阶段，链增长反应是化学反应控制的，用溶液聚合反应速率常数的外推值分析熔融接枝动力学行为可能是不正确的。