锥形光纤微透镜耦合特性

文章深入探讨和分析了半导体激光器与单模光纤耦合时采用锥形光纤微透镜后其耦合效率与参数之间的关系。给出了微透镜有效透过率的计算方法和考虑球面像差时耦合效率的计算公式，理论分析与实验结果相吻合。     

A simple technology to improve crystalline-silicon solar cell efficiency

The manufacturing of high-efficiency crystalline-silicon (c-Si) solar cells involves advanced technologies and sophisticated equipment not available in third-world country laboratories. This paper shows that conversion efficiencies in the 15–16% range can be achieved with a simple laboratory process. The main steps, which only require the use of analytic grade chemicals, are: (a) diffusion of a phosphorus-doped emitter layer on a textured surface; (b) deposition of narrow top metal contacts using a ph otolithography process; (c) Al alloyed back surface field, and d) a chemically sprayed tin dioxide antireflective coating.     

燃煤锅炉烟气脱硫技术研究

根据环保的要求，本文对燃煤锅炉烟气脱硫技术进行了机理性研究。     

给定箱容积的扬声器频响范围的积分极值

文章以效率的频率加权积分形式导出低频扬声器性能的限值。这个结果是关于效率、截止频率及箱容积间协调关系的一个可供选择的表达式。     

On the communication complexity of zero-knowledge proofs

The fact that there are zero-knowledge proofs for all languages in NP (see [15], [6], and [5]) has, potentially, enormous implications to cryptography. For cryptographers, the issue is no longer “which languages in NP have zeroknowledge proofs” but rather “which languages in NP have practical zeroknowledge proofs.” Thus, the concrete complexity of zero-knowledge proofs for different languages must be established. In this paper we study the concrete complexity of the known general methods for constructing zero-knowledge proofs. We establish that circuit-based methods, which can be applied in either the GMR or the BCC model, have the potential of producing proofs which can be used in practice. Then we introduce several techniques which greatly reduce the concrete complexity of circuit-based proofs, and we show that these techniques lead to zero-knowledge proofs of knowledge. Finally, we show how to combine the techniques of Kilian, Micali, and Ostrovsky, for designing zero-knowledge proofs with only two envelopes, with some of our techniques for reducing the number of bits which the prover must commit to. Supported in part by NSA Grant No. MDA90488-H-2006. Supported in part by NSF Grant No. CCR-8909657.     

油底壳放油塞座焊接夹具设计和装配要点

根据油底壳放油塞座焊缝是环形焊缝特点,通过设计焊接夹具结构,由原来的人工转动焊枪焊接改为被焊接零件自动旋转焊接,焊接速度可提高2~3倍,焊缝质量显著提高,油底壳放油塞座焊缝漏油返修率由原来的0.5%,降为0.05%,效果明显,创造了很好的效益。焊接夹具结构装配时,必须保证放油塞座定位块中心与立式微型直流减速电动机旋转中心一致,这样才能保证焊接夹具在大批量生产时正常使用保证焊接质量和焊接速度。     

重介工艺在太原选煤厂的应用

太选重介工艺投入运行后，不能充分发挥其洗选优势，针对生产中存的问题，提出解决方案，最终使得重介工艺逐步完善，在太选的洗煤生产中发挥了极其重要的作用。     

空气滤清器的效率及发动机磨损的试验研究

对CA6102汽油机进行的强化快速加灰试验表明，发动机的磨损与空气滤清器的效率有很大的关系。通过严密的理论推导，得出了不同粉尘浓度条件下发动机的磨损与空气滤清器滤清效率的经验公式。根据此经验公式，不仅定性且可定量地从空气滤清器的角度来分析研究发动机的磨损，同时给出了典型路面条件下空气滤清效率的合理限值。此经验公式对研究发动机的磨损、设计及评价发动机空气滤清器，有一定的指导意义。     

YBCO超导薄膜侧馈H天线实验研究

利用ＹＢＣＯ／ＹＳＺ超导薄膜制做了侧馈的Ｈ天线，实验表明，与相同的银膜侧馈Ｈ天线相比，相对效率在ｘ极化方向上提高了９．３ｄＢ，在ｙ极化方向上提高了１３．６ｄＢ。     

同轴HPGe探测器的全能峰效率测量及效率曲线斜率的经验公式

采用~(60)Co和~(152)Eu放射源,测定了灵敏体积为31.6,118.0和221.0cm~8的同轴HPGe探测器的全能峰绝对效率与121.8—1408keV能区内γ射线的能量关系,并用最小二乘法对效率曲线进行了较好的拟合。在极大的灵敏体积范围内,验证了锗探测器效率曲线斜率与其灵敏体积关系的经验公式:S=alogV+b,采用本公式可在小于3％的相对误差范围内,对已知灵敏体积的同轴HPGe探测器的全能峰效率随γ射线能量的变化作出估价。