A novel germanium/carbon nanotubes nanocomposite for lithium storage material

A new nanocomposite of Ge/carbon nanotubes (n-Ge/CNTs) was reported by a facile precursor method through a pyrolysis technique. Among it, germanium nanoparticles are encapsulated with a thin layer of amorphous carbon, which benefits to keep a good electronic contact with carbon nanotubes. Germanium nanoparticles are mainly supported inside the carbon nanotubes, which can effectively buffer the volume changes of Germanium. The composite was an effectively mixed (Li⁺ and e⁻) conducting network, which is vital to a quick Li insertion. The composite was shown to exhibit a reversible capacity of about 750 mAh g⁻¹ (74.4 mA g⁻¹) and an improved rate performance, compared with that of CNTs processed as the same condition. Our results demonstrated the composite to be a good active Li-storage material for Li batteries.     

Highly Porous Zirconia Ceramic Foams with Low Thermal Conductivity from Particle‐Stabilized Foams

Zirconia ceramic foams with ultra‐high porosity of 96%–98% have been fabricated using sodium dodecyl sulfate (SDS) as the particle stabilizer of zirconia particles for the first time. The wet foams stabilized by zirconia particles are ultra‐stable due to partially hydrophobic zirconia particles modified by SDS. Zirconia foams exhibit close cells with thin cell wall and small grain size. Increasing SDS concentration favors the foamability of the suspension, and further increases the porosity of ceramic foams. Zirconia ceramic foams with porosity of 98.1% have compressive strength of 0.26 ± 0.05 MPa. Decreasing solid loading leads to the porosity of ceramic foams. The compressive strength could be improved significantly by increasing the sintering temperature. Zirconia ceramic foams with porosity of 97.9% has low thermal conductivity of 0.027 ± 0.004 W·(m·K)^?1, which could be used as thermal insulation and refractory material.     

Mass transfer simulation on pervaporation dehydration of ethanol through hollow fiber NaA zeolite membranes

A multi‐layer series‐resistance mass transfer model was developed to simulate mass transfer behaviors of water/ethanol mixture through hollow fiber NaA zeolite membranes. The mass transfer through zeolite layer was described by Maxwell‐Stefan mechanism based on adsorption and diffusion parameters obtained from molecular simulation. The mass transfer through asymmetric hollow fiber support was described by dusty gas model involving Knudsen diffusion and viscous flow. It was found that the sponge‐like layer of support besides of zeolite layer made an important contribution to overall membrane transfer resistance while the finger‐like layer had less effect. When permeate pressure shifted from 0.2 to 7.5 kPa, the mass transfer resistance contribution of sponge‐like layer varied from 27.1 to 17.8%. Effects of microstructure parameters of support on mass transfer through membrane were investigated extensively. Large pore size and thin thickness for sponge‐like layer of support were beneficial to improve water permeation flux. © 2016 American Institute of Chemical Engineers AIChE J, 62: 2468–2478, 2016     

国产开放式电石炉导电颚板的改进

在考察分析了国产开放式电石炉导电颚权的消耗情况后，针对其存在的问题改进了导电颚板的设计，从而提高了导电颚板的使用寿命，延长了电石炉的运行周期。     

聚氨酯/乙烯基酯树脂互穿聚合物网络结构与性能的研究

通过同步法制备了一系列聚氨酯／乙烯基酯树脂互穿聚合物（ＰＵ／ＶＥＲ－ＩＰＮ）,研究了ＰＵ／ＶＥＲＩＰＮ性能的影响因素。结果表明：随着ＰＵ含量的增加,ＩＰＮ的热稳定性能有一定程度的提高;而ＶＥＲ的含量增加,ＰＵ／ＶＥＲ－ＩＰＮ的剪切强度提高。实验还发现：当ＰＵ／ＶＥＲ－ＩＰＮ为部分相容的多相微区结构时,对增加ＩＰＮ的力学损耗更有利     

磷细菌突变株生理特性的研究

本文对经过筛选培育出的一株解磷能力较强的磷细菌突变株Ｄ０１７Ｐ的生理特性进行了研究。其中,最佳氮源为麦麸汁,与出发菌株所用马铃薯汁相比,生物量增加９．８倍,解磷能力提高７１．４％,最佳碳源为蔗糖,与出发菌株所用碳源葡萄糖比较,解磷能力提高２８．８％,金属离子,培养温度,ｐＨ,气／液比等也对突变株的生长有一定影响,其结果可作为选定工业化条件的参考。     

多孔介质气体流动模型在垫片密封中的应用

气体通过非金属垫片的泄漏可以用多孔介质模型来描述,由流动方程得到的垫片材料常数可以作为密封设计的基本参数。这一工作有可能使现行规范中的密封设计由主要依据连接结构强度的设计方法发展成以最大允许泄漏率为设计准则的“紧密性设计”方法。     

耐火材料中氮的测定

介绍利用样品预处理来抑制高浓度氧对氮的干扰，从而准确测定耐火材料中的氮含量。     

Cobas6000自动生化分析仪临床检验性能评价

目的：对Cobas6000自动生化分析仪在临床生化检验中的应用效果做出总体评价。方法：检测了质控血清、样本血清中的丙氨酸氨基转移酶（ALT）、天冬氨酸氨基转移酶（AST）、总蛋白（TP）、白蛋白（ALB）、总胆红素（TB）、血糖（Glu）、尿素氮（Bun）、肌酐（Crea）、尿酸（Uric）、肌酸激酶（CK）、钾（K）、钠（Na）、氯（CI）、钙（Ca）等项目;考察了精密度、线性相关性和回收入率,并与Vitros950干化学全自动生化分析仪做了相关性分析。结果：批内变异系数为0．61％～2．36％,批间变异系数为0．81％～4．54％;标本的稀释度与测定的浓度值线性相关性较好;Cobas6000的测定结果与强生Vitros950相比,具有良好的相关性,相关系数r2在0．9624～0．9975之间;回收率为95％～105％。结论：该仪器对血清各项生化指标的测定结果稳定,精密度和准确度均较好。