风压和热压共同作用下高层建筑外窗空气渗透计算方法和计算机程序

本文通过对风压和热压共同作用下空气渗透过程的分析,提出了新的渗风量计算方法和计算公式,编制了相应的计算机程序,并说明了其原理和使用方法。文内依据现行暖通规范(GBJ19-87),建立了气象参数数据库,计算机运行中可直接读取气象参数。由于本方法考虑了建筑内部隔断对渗风量的影响,因而与以往的方法相比,计算结果更合理、更准确。     

纳雍地区龙潭组中段沉积序列模式及沉积体系的初步研究

本文在对贵州省纳雍地区龙潭组中段一剖面详细研究的基础上,划分出八种主要岩相类型,在此基础上,运用马尔可夫链分析法建立了该段的两种主要序列模式,通过沉积序列分析认为:该区龙潭组中段为一受潮汐影响的三角洲体系。     

造纸用新型材料——AKD中性施胶剂乳液的研究

本文介绍一种中性施胶剂AKD合成实验,同时对AKD的乳液的制备进行了研究。并给出了工业化生产流程及在造纸工业中的应用条件。     

线上线下混合式教学在"食品理化检验"课程中的探索

以"食品理化检验"的课堂教学为例,改变以往的教统的教学模式,基于云班课和虚拟仿真实训平台,开展线上与线下相结合的混合式教学,增强学生学习兴趣,提高学生参与度,通过这种混合式的教学方式也使学生的自主学习和师生互动交流得到了进一步强化,使学生的学习积极性、主动性和创新能力不断提升,教学效果有了明显提高.     

高压下H2/CO稀释剂对乙烷/空气层流扩散火焰中碳烟形成的影响

采用CoFlame程序模拟研究了高压下H₂/CO稀释剂对乙烷/空气层流扩散火焰中碳烟形成的影响。结果表明:H₂和CO添加之后,火焰温度均略有增加,且碳烟体积分数随着H₂/CO稀释比的增加而降低。H₂的添加使得碳烟表面生长区域的H自由基浓度增加,减少了初始碳烟颗粒成核及表面生长的活性位点数,导致脱氢加乙炔(HACA)反应中氢提取速率减缓以及碳烟颗粒表面生长速率减缓。CO的添加使得苯(A1)和芘(A4)摩尔分数减少,减缓了碳烟成核速率,导致碳烟的生成受到抑制。     

水性减阻耐磨环氧涂料的制备及性能研究

通过对水性减阻耐磨涂料成膜树脂体系、颜填料体系以及助剂体系的研究,采用中等相对分子质量和高相对分子质量树脂乳液物理共混改性,搭配改性脂肪胺加成物固化剂提高涂层的抗弯曲性能和耐冲击性能,搭配不同类型的防锈填料提高涂层的防腐蚀性能.所得涂层具有良好的抗弯曲性能、耐冲击性能、耐磨性以及耐盐雾性能.     

Partition of <Emphasis Type="Italic">n</Emphasis>-Butanol Among Phases and Solubilization Ability of Winsor type III Microemulsions

The partition of n-butanol in Winsor type III (W-III) microemulsions was investigated in this work. Three kinds of anionic surfactants (sodium dodecyl sulfate (SDS), sodium dodecyl sulfonate (DSS), and sodium dodecyl benzene sulfonate (SDBS)) and two kinds of anionic/cationic surfactant mixtures (SDS/octadecyl trimethyl ammonium chloride (OTAC) mixtures and DSS/OTAC mixtures) were studied. Internal standard gas chromatography was employed in n-butanol content analysis. The results showed that no water exists in the excess oil (EO) phase and no oil exists in the excess water (EW) phase. For the W-III microemulsions obtained by salinity scanning, relatively constant n-butanol content in the EO (11–12 v%) and EW (1–4 v%) was found under different salinities. Accurate measurement of n-butanol content in each phase is important for those systems having low solubilization ability. For the W-III microemulsions prepared using SDS/OTAC surfactant mixture, the percentage of n-butanol distributed into the interfacial layer decreased while the fraction of n-butanol in the interfacial layer first increased sharply and then tended to be stable with the addition of n-butanol. For the different optimum W-III microemulsion systems tested, most of the surfactant-to-alcohol molar ratio data are near 1:3, but obvious deviation could be observed for some data. On the basis of the accurate measurement of n-butanol content in the EO and EW phases, the standard free energy, ΔG _o→in ^* (T = 298.15 K) of n-butanol transferring from the EO phase to the interfacial region was calculated. The results show negative ΔG _o→in ^* values. For microemulsions with the same components, n-butanol content is an important factor influencing the ΔG _o→in ^* value, and a high absolute value of ΔG _o→in ^* leads to high solubilization ability.