电场作用下水的粘性试验分析

电场作用下极性水分子和离子水化物将有序排列,由此导致水的粘度特性显著变化。文中通过室内试验,研究垂直于水流方向施加的电场对水的粘度特性的影响,在数字直流电源产生的强电场中进行常水头渗流试验,获得了水的粘度与电场强度关系的试验曲线,并观察在电场作用下,水的粘度与所含离子浓度、渗流速度等因素的关系,基于试验结果分析了电场改变水的粘度特性的作用机制。试验结果表明,外加电场对水的粘度有明显的影响,随着电场强度增加,水的粘度呈减小的趋势;在相同的电场强度下,水的粘度与离子浓度成正比关系,与渗流速度成反比关系。     

Influence of Zn ion implantation on structures and field emission properties of multi-walled carbon nanotube arrays

The structures and field emission properties of multi-walled carbon nanotube arrays implanted with Zn+ by MEVVA ion implanter have been investigated.The results revealed that Zn+implantation induced structural damage and that the top of carbon nanotubes with multi-layered graphite structure were transformed into carbon nanowires with amorphous structure.Meanwhile,C:Zn solid solution was synthesized after Zn+ implantation.The turn-on field and threshold field were 0.80 and 1.31 V/μm,respectively for original...     

江河水污垢对小管径恒壁温管内对流换热影响

为有效提高江河水冷热源的利用率,应用热力学第一、第二定律和湍流流动理论,讨论和分析了污垢对恒壁温小管径管内对流换热过程热力学性能的影响。分析结果表明,有污垢存在时,污垢层导热引起的熵产在管内对流传热熵产中占主要部分,而温差传热引起的熵产则相对较小,且在雷诺数较大,管径较小的流动中,会出现粘性流动引起的熵产大于温差传热引起的熵产;随雷诺数的增大和污垢热阻的产生,熵增率都是单调增加的。因此在利用江河水发展水源热泵时,要充分考虑污垢热阻对换热器性能的影响,尤其是污垢层导热热阻的影响。     

省级机动车排气检测监管系统应用研究

为解决当前我国省级环保部门对机动车排气检测监管的实际困难,提高机动车排气污染监管能力,介绍了省级机动车排气检测监管信息系统的构建方法,提出了系统的整体技术框架、网络架构和功能模块组成,并阐述了基于Web services的省—市数据交换技术和自定义统计报表技术的实现方法。以广东省为例开发了原型系统,试运行结果初步显示了系统的实际运行能力。该系统方案能有效解决当前省级环保部门机动车监管所面临的实际问题。     

Mechanical Properties of Phenolic-Resin Composites Reinforced with CF/BF Interlayer Hybrid Fibers

Phenolic-resin composites reinforced with carbon fiber (CF) and basalt fiber (BF) interlayer hybrid fibers plain fabric were fabricated. The tensile strength, compressive strength and interlaminar shear strength of the prepared composites were studied. The results indicated that hybrid fibers reinforced composites possessed the advantages of both CF and BF. When resin content was 35% by volume fraction, the comprehensive mechanical performance of BF/CF reinforced phenolic resin composites reached the optimal values with the warp and weft direction tensile strength, compressive strength and interlayer shear strength being 252 MPa and 487 MPa, 105 MPa and 129 MPa, 21 MPa and 20 MPa, respectively. The scanning electron microscope (SEM) observations showed that the BF/CF hybrid fibers reinforced composites had better interfacial adhesion.     

基于数据交换模型的测试方法

通过深入地研究数据交换的通用模型,抽象数据交换的过程状态和规则,提出了一种基于数据交换的测试模型及其测试的方法,该方法能够适用于绝大多数数据交换场景的测试并有效地提高测试效率.最后给出了未来的研究方向.     

Synthesis of Li2Fe0.9Mn0.1SiO4/C composites using glucose as carbon source

Li2Fe0.9Mn0.1SiO4/C composites were synthesized by using glucose as carbon source. The samples were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM) and electrochemical measurements. All Li2Fe0.9Mn0.1SiO4/C composites are of the similar crystal structure. With increasing the carbon content in the range of 5%-20% (mass fraction), the diffraction peaks in XRD patterns broaden and the particle sizes and the tap density of samples decrease. The Li2Fe0.9Mn0.1SiO4/C composites with carbon content of 14.12% show excellent the capacity retention remains 92.2% after 30 cycles.     

二氨丙基苯固化剂的合成及应用

以无水三氯化铝为催化剂,用苯和1,3-口恶嗪-2-酮进行氨丙基化反应合成了二氨丙基苯。研究了物料物质的量比、反应时间、温度对反应的影响,确定了合成二氨丙基苯的较佳反应条件。通过DSC对环氧树脂中该固化剂的加入量和固化工艺条件进行了研究,对环氧树脂固化物的力学性能等指标进行了考察。     

锂离子电池用磷腈类聚合物电解质的制备与性能

采用六氯环三磷腈高温开环聚合方法制备了聚二氯磷腈,然后采用醇钠法,取代聚二氯磷腈的氯,制备了聚二（二乙二醇单甲醚）磷腈（MEEP）,探索出了较佳的合成工艺,采用FT-IR、31P-NMR、13C-NMR、质谱对其进行了结构表征和分析。结果表明,所制备的磷腈聚合物确实为MEEP。采用自制的MEEP,与三氟甲基磺酸锂（LiCF3SO3）盐进行复配,制备了锂离子电池用聚合物固体电解质,对其热稳定性、导电性进行了测试,其开始分解温度在200℃以上,室温电导率达到了1.187×10-4S/cm（25℃）,具有较佳的导电性和热稳定性,可用于锂离子电池的电解质。     

含柔性链SiO_2/EP纳米杂化材料的固化动力学

采用溶胶-凝胶法制备了聚硅酸溶胶,在其表面接枝柔性链段并以此为前驱物,通过原位聚合法制备了SiO2/EP纳米杂化材料。利用差示扫描量热仪对杂化材料的固化动力学进行了研究。采用Kissinger和Crane等方法,利用不同升温速率下的DSC曲线,分别求出固化体系的表观活化能Ea、反应级数n和频率因子A等参数,得出了固化体系的反应动力学方程。