卡系费休法测定氯乙烯单体中水含量的影响因素

介绍了卡尔费休法的测定原理,具体分析了采用卡尔费休法测定氯乙烯单体中水含量的影响因素,指出采用闪蒸仪进样器,能有效提高分析结果的准确性和工作效率。     

果实喷施脱落酸对黑虎香葡萄酒品质的影响

黑虎香葡萄属于鲜食、酿酒兼用品种，香气独特、抗逆性强。对转色期黑虎香葡萄果实喷施不同浓度脱落酸（ABA），研究其对葡萄酒品质的影响。结果表明，喷施500 mg/L ABA处理效果最好，显著提高黑虎香葡萄酒酒精度、干浸出物、花色苷和总酚含量，显著降低酸含量（P＜0.05）；显著增加黑虎香葡萄酒萜烯类、醇类和醛酮类等香气物质含量（P＜0.05），含量影响较大的香气成分为乙酸乙酯、乙酸苯乙酯、苯乙醇、壬醇、戊二酮、香叶基丙酮、乙缩醛、香茅醇和香叶醇。     

Au and Co3O4 anchored Bi2WO6 with enhanced electron paramagnetic resonance,surface plasmon resonance,nonlinear and magnetic properties

The combination of surface plasmon resonance (SPR) effect with hetero-p–n structure shows promising benefits to optical linear and nonlinear properties. In this study, Au nanoparticles (NPs) decorated p–n hetero-structured Co₃O₄/Bi₂WO₆ composite was synthesized and characterized in terms of the optical linear and nonlinear and magnetic properties, morphology, electron transition, charge transfer, energy band gap, polarizability, SPR effect, and oxygen vacancies using scanning electron microscopy, X-ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy, Z-scan, ultraviolet–visible spectra, and vibrating sample magnetometer. The combination of Co₃O₄ provided active 3d electrons transition and charge transfer which increased carriers’ concentration and reduced the energy band gap. Au SPR enhanced the internal polarization and strengthened the built-in electric field, yielding strong nonlinear behavior. In addition, magnetic Co₃O₄ endowed sample with room-temperature ferromagnetism which was obviously strengthened by Au NPs. The obtained sample is promising for laser and photonics applications.     

多域组合去噪技术在塔中奥陶系低信噪比资料处理中的应用

塔中地区主要目的层是深层奥陶系碳酸盐岩储层,由于地表沙丘起伏大、沙层松散,地震波吸收衰减严重,干扰波复杂,导致目的层地震资料信噪比非常低。沙丘所产生的噪声不仅使有效波特征受到影响,而且使面波等相干噪声的规律性遭到破坏,从而增加了去噪处理的难度。为了在保真的前提下最大限度地压制干扰波、提高塔中奥陶系目的层资料信噪比,基于多年沙漠区地震资料处理所取得的经验与认识,通过对塔中地区地震资料干扰波成因、类型及其特点进行分析,提出了根据噪声类型、能量强弱、频带范围及其在不同域中所表现的特征,分类、分步、分频、分域、分时窗、分区的六分法多域组合去噪技术思路与处理流程。实际资料应用效果表明,多域组合去噪技术能明显提高奥陶系内幕反射的信噪比以及小断点、碳酸盐岩内部异常或"串珠"状反射的清晰度。     

Research on the machinability of A-plane sapphire under diamond wire sawing in different sawing directions

Due to its superior mechanical, optical and chemical properties, sapphire (α-Al₂O₃) is widely used in engineering, optics, medicine, and other scientific research fields. The atomic structure of sapphire gives rise to anisotropy in its mechanical properties, which affects the machinability of sapphire materials on different crystal planes. Different cutting directions will affect the wafer economy and surface quality achieved during wire sawing due to this anisotropy. In this study, the machinability of A-plane sapphire was investigated for diamond wire sawing in three different directions, following the C-plane, R-plane and M-plane. The results show that the direction following the M-plane could be the best direction for diamond wire sawing because this direction results in the minimal sawing forces, the lowest specific energy and the smallest volume of material that will need to be removed during subsequent processing. These characteristics correspond to the direction with the highest fracture strength since the material is removed by brittle machining. The force ratio for sawing in the direction of the R-plane is the smallest because this direction is associated with the minimum hardness and the lowest critical load for the transition from plastic to brittle removal of the workpiece material. The 3D height parameters show no obvious pattern among the three sawing directions. The mechanism of material removal is mainly brittle removal, with some plastic removal, and is obviously affected by the crystal orientation.     

抗FGF-2纳米抗体抑制碱烧伤诱导大鼠角膜血管新生

目的：研究抗成纤维细胞生长因子（FGF-2）纳米抗体对碱烧伤诱导的大鼠角膜血管生成的治疗作用。方法：将SD大鼠分为：假手术组（Sham），模型组（Model，直径为3 mm的浸有1 mol/L NaOH溶液圆形滤纸贴于大鼠眼角膜中央处30 s，制备大鼠碱烧伤血管生成模型）和治疗组（Treatment，术后7天至21天用3 mg/mL的抗FGF-2纳米抗体溶液滴眼，每日3次，每次10 μL，共14天）。通过体视显微镜和CD31免疫组织化学染色计算大鼠角膜血管生成情况。实时荧光定量PCR、酶联免疫吸附测定和免疫组织化学染色3种方法检测抗血管内皮生长因子（VEGF）和FGF-2的mRNA和蛋白表达水平。结果：（1）血管：治疗组较模型组的面积显著减少，血管管腔较窄（P<0.05），在药物干预14天后，差异最为显著；（2）FGF-2的mRNA和蛋白表达水平：模型组与治疗组的结果相近（P>0.05）；（3）VEGF的mRNA和蛋白表达水平：治疗组显著高于模型组（P<0.05）。此外，假手术组的持续给药也使得VEGF表达显著增加（P<0.05）。 结论：抗FGF-2纳米抗体可抑制由碱烧伤诱导的角膜血管新生，但也使得正常大鼠角膜或病理大鼠角膜的VEGF表达水平代偿性升高。     

基于Android的电话号码查询系统设计

介绍了Android操作系统,以及基于Android的电话查询系统的关键技术,对该系统的具体设计与部分实现过程进行了阐述,给出了系统运行结果。经测试,该系统能在目前主流的Android移动设备如手机、平板电脑上正常运行,该系统立足于常用生活电话信息查询,为生活服务提供了方便。     

电动汽车用新型轴向磁场车轮电机的设计

车轮电机由于取消了齿轮和机械差动器,减小了驱动链的组件,因而减小了整个驱动链的重量,提高整个系统的可靠性和效率。该文对一种新型的应用于电动车辆驱动的直驱轮用轴向磁场永磁同步电动机的进行了设计。电机的电枢铁心由各个在磁路上没有联系的定子极组成,省去了定子铁心轭部,电机结构简单易制造。采用等效磁路法对电机进行了电磁设计,并用有限元法进行了验证。设计和仿真结果证明所提议的结构是可行的。     

盘式永磁同步风力发电机的设计

本文介绍双转子单定子盘式永磁同步风力发电机的设计。用软磁复合(SMC)材料来形成定子铁心,同时采用结构简单的背靠背绕组,使电机的制造变得容易。用等效磁路法对5 kVA盘式永磁同步发电机进行了设计,并用有限元法对其进行了验证,计算和仿真结果表明此设计方案是可行的。     

城市快速公交车站点式玻璃幕墙的应用

针对当前城市化建设步伐的加快，城市道路交通拥挤日益凸显的难题，提出了快速公交系统是未来城市公交发展方向的理念，并详细介绍了该系统中点式玻璃幕墙的组成、特点及应用效果。