交流，共享，流动——现代大空间办公模式的优劣与对策

讨论了现代办公空间设计出现的新要求,通过办公空间演变趋势的探讨,归纳为若干大空间办公模式,并分析、比较其空间性质及特点,以及采用开放式办公布局的优势、不足及解决对策.     

Analysis of S-SEED''s characteristics in optical switch

This article introduces the basic structure of a symmetric self-electrooptic effect device （S-SEED）, and applies the Kirchoff＇ s current law and a purely equivalent capacitive model, to analyze S-SEED＇s switch characteristics. Linear approximation and N-segment approximation are utilized to obtain S-SEED＇s voltage-time （V-T） and characteristics. Theoretical analysis is verified by simulations, and the results demonstrate that the precision of S-SEED＇s switch time can satisfy the requirement in applications with linear approximation. Moreover, the simulations compare S-SEED＇s switch characteristics with different input powers and input contrast ratios, which reveal that increasing input contrast ratio is an effective way to improve S-SEED＇s switch characteristics.     

Preparation of Ultra—fine Aluminum Nitride in Thermal Plasma

Ultra-fine aluminum nitride has been synthesized by the evaporation of aluminum powder at atmospheric-pressure nitrogen plasma in a hot-wall reactor.The average size of aluminum nitride particle is 0.11μm measured by scanning electric mirror(SEM),and the purity is at least over90% evaluated by X-Ray diffraction(XRD).The conversion of Al powder to aluminum nitride is strongly depended on the injection of NH3.Typical experimental parameters such as the feed rate of raw material,the flow rate of ammonia and the position of injecting aluminum powder into the reactor are given.     

宝山水电站坝区配电的选型及应用

本文通过ZWB组合式变电站在黑龙江省宝山水电站工程中的应用,论述了在坝区配电中选用组合式变电站的作用和必要性,并简要介绍了宝山电站组合式变电站的选型要点。     

Characterization of proton-exchanged optical waveguides in ZnO:LiNbO3

We report the first demonstration of proton-exchanged optical planar waveguides in x-cut and z-cut LiNbO₃ doped with 6 mol% ZnO using adipic acid as proton source. These waveguides exhibit a graded index profile which can be modeled by a linear step function with a surface index increase of 0.135 and 0.14 for x-cut and z-cut waveguides, respectively. The diffusion constant D_o and the activation energy Q are characterized optically to be 1.64×10⁹ μm²/h and 88.8 KJ/mol for x-cut waveguides, and 1.478×10⁹ μm²/h and 91.25 KJ/mol for z-cut waveguides, respectively. The diffusion rate along the z-axis is slower than that along the x-axis, whereas the surface index increase on z-cut waveguides is larger than that on x-cut waveguides.     

The α- to β-Si3N4 transformation in the presence of liquid silicon

The compacts consisted of , -Si₃N₄ and free silicon are heat treated in the range 1650° C to 1750° C in an argon atmosphere in order to observe the following behaviours; the to phase transformation and variations of the microstructure during heat treatment in silicon nitride. For the microstructural observation of the heat treated specimens, the same grains in the polished surface were investigated before and after eliminating the retained silicon by etching. The to phase transformation, in this case, occurs via silicon melts irrespective of added -Si₃N₄. Both and phases are soluted and precipitated into molten silicon and their morphology are changed from an equiaxed shape to prismatic one. Although elongated grains are precipitated at low temperature or in the early stage of heat treatment, fine precipitated grains are mainly observed with increasing heat treating temperature.     

硝基联苯、氨基联苯及啶酰菌胺的高效液相色谱分析方法

建立了一种高效液相色谱定量方法,测定以4-氯-2'-硝基联苯制备4-氯-2'-氨基联苯合成啶酰菌胺路线各步反应中的有效成分含量.采用InertSustain ODS-C18不锈钢柱(250 mm×4.6 mm i.d.×5μm)和二极管阵列检测器,以乙腈和0.02％磷酸水为流动相,流速为1.0 mL/min,在220 nm波长下对中间体4-氯-2'-硝基联苯进行分离和定量分析;在254 nm波长下对中间体4-氯-2'-氨基联苯进行分离和定量分析;在254 nm波长下对啶酰菌胺进行分离和定量.分析结果表明,4-氯-2'-硝基联苯保留时间约24.3 min,线性相关系数为1.0000,标准偏差为0.04,变异系数为0.34％,平均回收率为100.04％;4-氯-2'-氨基联苯保留时间约18.0 min,线性相关系数为1.0000,标准偏差为0.05,变异系数为0.33％,平均回收率为99.94％;啶酰菌胺保留时间约11.9 min,线性相关系数为1.0000,标准偏差为0.21,变异系数为0.32％,平均回收率为100.09％.方法 操作简便,精密度与准确度较高,满足定量分析要求.