多波段条纹管激光成像系统探测距离计算

基于条纹管激光成像的基本原理，分析了利用条纹管实现紫外到近红外波段激光成像的技术可行性，并对其性能进行了分析；建立了激光成像雷达方程，计算了不同波长在不同天气条件下的探测距离，并分析了各激光波长的应用领域和优缺点．     

半球上导线不同绕法在球心处磁场的差别

在《物理学教程》中有这样一道习题：半径为R的木球上均匀绕有密集的细导线，线圈平面彼此平行，且以单层线圈覆盖住半个球面，设线圈的总匝数为N．通过线圈的电流为I．求球心O处的磁感强度．     

表面注入P-top区double RESURF功率器件表面电场模型

提出表面注入P-top区double RESURF功率器件表面电场和击穿电压解析模型. 基于分区求解二维Poisson方程, 获得double RESURF表面电场的解析式. 借助此模型, 研究了器件结构参数对表面电场和电势的影响; 计算了漂移区长度和厚度与击穿电压的关系, 给出了获得最大击穿电压和最小导通电阻的途径. 数值结果, 解析结果和试验结果符合较好.     

Applying the silver‐tube introduction method for thermal conversion elemental analyses and a new δ2H value for NBS 22 oil

The δ²H_VSMOW–SLAP value of total hydrogen of the international measurement standard NBS 22 oil was determined by a new method of sealing water in silver tubes for use in a thermal conversion elemental analysis (TC/EA) reduction unit. The isotopic fractionation of water due to evaporation is virtually non‐existent in this silver‐tube method. A new value for the δ²H_VSMOW–SLAP of NBS 22 oil, calibrated with isotopic reference waters, was determined to be ?116.9 ± 0.8‰ (1σ and n = 31). Published in 2010 by John Wiley & Sons, Ltd.     

甘草多糖的分离纯化及高效毛细管电泳分析

1 引言甘草是一种最常用的中草药,可与很多中草药配伍,它具有清热解毒功用,其主要含甘草酸、黄酮和糖类等化合物.近来研究表明,甘草可治疗和预防肝炎、并具抗艾滋病毒作用、抗真菌作用和免疫促进作用.2 实验部分2.1 仪器 723型紫外分光光度计(上海第三分析仪器厂);SephedexG-200层析柱(中国科学院大连化学物理研究所);1229型高效毛细管电泳仪(北京新技术应用研究所);9523型记录仪(北京新技术应用研究所).2.2 材料与试剂 甘草(同仁堂药店);Dextron marker(Pharmacia产品);各种单糖标准(美国Sigma公司产品);1-萘胺,硼氰化钠,冰乙酸,三氯甲烷,硼砂为国产分析纯试剂.     

CePO4纳米微粒的摩擦学行为

稀土元素由于具有４ｆ电子特性，使其元素及其化合物具有许多特殊的性能．因此，研究和开发稀土在润滑材料领域的应用，具有重要意义［１～６］．本文采用吸附共沉淀表面修饰法制备了磷酸烷酯修饰的ＣｅＰＯ４纳米微粒，并将其分散于基础润滑油中考察其摩擦学行为，试图利...     

铈铝复合载体对钼基催化剂耐硫甲烷化催化性能的研究

采用共沉淀法、浸渍法和沉积沉淀法制备了CeO₂-Al₂O₃复合载体,比较了不同复合载体浸渍钴钼后的耐硫甲烷化催化性能,并优化了复合载体中CeO₂的含量。结合N₂物理吸附、XRD、H₂-TPR等表征手段对复合载体及其负载的钴钼催化剂进行物相和结构分析发现,在Al₂O₃中添加CeO₂可以明显提高合成气的耐硫甲烷化活性,其中,沉积沉淀法制备的25% CeO₂-Al₂O₃复合载体负载钴钼后具有最佳催化活性。     

Structural and magnetic properties of pulsed laser deposited SrRuO3/CoFe2O4/La2/3Sr1/3MnO3 magnetic oxide heterostructures on SrTiO3(001) and MgO(001)

We report on the growth of all-oxide SrRuO₃/CoFe₂O₄/La_2/3Sr_1/3MnO₃ and La_2/3Sr_1/3MnO₃/CoFe₂O₄/SrRuO₃ heterostuctures on SrTiO₃(001) and MgO(001) substrates by pulsed laser deposition. Structural analyses by X-ray diffraction and transmission electron microscopy clearly indicate the preservation of epitaxial relations when the La_2/3Sr_1/3MnO₃ layer is grown first, whereas trilayers with SrRuO₃ at the bottom are more disordered. Both the substrate material and the deposition sequence strongly influence the formation of various structural defects such as interfacial dislocations and sub-grain structures, and this is clearly reflected by a reduction of the saturation magnetization in the top electrode. When the substrate material and the deposition sequence are correctly chosen, however, the magnetic moments of the La_2/3Sr_1/3MnO₃ and SrRuO₃ layers reverse independently, and the La_2/3Sr_1/3MnO₃ layer retains bulk-like magnetic properties.