SiO2胶体探针的制备及其在表面力测定中的应用

采用一种新方法——双向三维移动平台法制备胶体探针，该方法使用两个三雏移动平台，同时将CCD与长工作距离显微镜集成，组成视频监视系统来监控探针的整个制备过程，方便了操作。利用此自组装装置制备的二氧化硅胶体探针在原子力显微镜上进行力曲线测量，将分析数据与Ducker的经典论文进行对照，得到较为理想的结果。     

Optimization of enzymatic hydrolysis parameters for antioxidant capacity of peptide from goat placenta

The goat placenta protein was hydrolyzed by pepsin and the optimal hydrolysis parameters of strongest antioxidant capacity of peptides were obtained using response surface methodology (RSM). The effects of reaction temperature, pH value and enzyme to substrate (E:S) ratio on the reducing power (RP) of the peptides and degree of hydrolysis (DH) of protein were well fitted to a quadric equation with high determination coefficients. The hydrolysate with optimal RP was predicted to be obtained at: temperature of 36.5 °C, pH value of 1.05, and E:S ratio of 2.03% and 3–10 kDa fraction (10 mg/mL), rich in GLY, GLU, ASP and TYR, was proved to exhibit highest RP, which is equivalent to the RP of 0.189 mg/mL ascorbic acid. The fraction of peptide also showed peroxidation inhibition in linoleic acid oxidation system and had a free radical scavenging ability similar to ascorbic acid (10 μg/mL) in the 1,1-diphenyl-2-picrylhydrazyl (DPPH) system after 17 min.     

低密度住宅结构施工阶段抗渗措施

在结构施工过程中,对容易产生漏水隐患的特殊部位的处理及质量管控是非常重要的。论文列举了一些低密度住宅项目容易出现渗漏的结构部位及其产生渗漏的原因,并简要介绍了在主体结构施工阶段的抗渗预防措施。     

产漆酶疣孢漆斑菌Ws2-6原生质体制备条件的研究

通过对酶的种类、酶的组合、酶液浓度、酶解时间、酶解温度、渗透压稳定剂等因素的研究获得了制备疣孢漆斑菌原生质体的有效条件.采用浓度为0.7mol/L氯化钠为渗透压稳定剂,在pH 6的磷酸缓冲体系中,以15mg/mL溶壁酶、5mg/mL纤维素酶R-10和10mg/mL蜗牛酶的混合酶液处理培养18h的菌丝体,30℃、80r/min振荡酶解6h,原生质体产生量达到最大值为7.83×106个/mL.此外,对原生质体释放的跟踪观察发现,疣孢漆斑菌原生质体释放有顶端、侧端释放2种方式.     

固定消防设施在灭火救援中的应用现状

针对调查收集的380份火灾案例,根据火灾处置过程描述,对火灾探测系统、灭火设施及防排烟设施的使用率、应用成功率进行了统计,并总结了固定灭火设施失效的现象,分析了影响系统使用效果的主要原因.统计结果表明,室内外消火栓系统是火场中应用较多的固定消防设施,其中利用室外消火栓给水系统供水灭火,成功率占89.5%,室内消火栓给水系统占77.4%.     

建筑外墙节能质量管理问题探析及对策研究

建筑外墙节能质量是保证和实现建筑节能效果的核心内容。施工全过程建筑外墙节能质量问题主要包括设计审核不规范、材料检验不合格、图纸会审不全面、投入把关不足、工艺控制不严、新型工艺使用准入审核缺乏、缺乏成品保护意识、竣工验收控制不严、保修责任模糊和寿命周期后管理缺失等10个方面;基于施工全过程建筑外墙节能工程质量影响因素及对其内在本质剖析,从加强节能设计审核、优化施工组织设计、发挥人的主导作用、强化过程动态控制、建立健全管理制度等5个方面,提出改善建筑外墙节能工程质量管理的策略,以促进建筑节能质量管理水平的整体提升。     

The effect of alumina/water nanofluid particle size on thermal conductivity

This study examines the effect of particle size, temperature, and weight fraction on the thermal conductivity ratio of alumina(Al₂O₃)/water nanofluids. A Al₂O₃/water nanofluid produced by the direct synthesis method served as the experimental sample, and nanoparticles, each of a different nominal diameter (20, 50, and 100 nm), were dispersed into four different concentrations (0.5, 1.0, 1.5, and 2.0 wt%). This experiment measured the thermal conductivity of nanofluids with different particle sizes, weight fractions, and working temperatures (10, 30, 50 °C). The results showed a correlation between high thermal conductivity ratios and enhanced sensitivity, and small nanoparticle size and higher temperature. This research utilized experimental data to construct a new empirical equation, taking the nanoparticle size, temperature, and lower weight fraction of the nanofluid into consideration. Comparing the regression results with the experimental values, the margin of error was within ?3.5% to +2.7%. The proposed empirical equation showed reasonably good agreement with our experimental results.