高性能商品砂浆的制备与研究

高性能商品砂浆是一种可持续发展的新型建材产品,可解决建筑砂浆施工的多种质量问题.介绍了NCS系列商品砂浆的工作性能、凝结时间、含气量、强度及其抗渗性能.这些性能研究表明NCS系列商品砂浆明显优于普通砂浆,符合建筑砂浆的施工和质量要求,具有广阔的应用前景.     

Effect of dynamic vulcanization on the microstructure and performance of polyethylene terephthalate/elastomer blends

Blends of polyethylene terephthalate (PET) and ethylene‐ethyl acrylate‐maleic anhydride terpolymer (E‐EA‐MAH) were dynamically crosslinked in a one‐step extrusion process. An amine‐terminated glycol reacting with MAH moieties was used as the crosslinking agent. The effect of blend composition and dynamic crosslinking on the microstructure and mechanical properties were investigated. Blend ratios ranging from 80:20 to 20:80 PET/E‐EA‐MAH were studied. The region of phase inversion was located for uncrosslinked and dynamically crosslinked blends. The rheological characterization was also carried out for these blends in comparison with the neat materials. After dynamic crosslinking, the phase inversion is shifted from the 30–40% range to the 70–80% range of elastomer content. This shift is induced by the increase of viscosity and elasticity of the network formed. Dynamically crosslinked blends show significant improvements in impact strength but also exhibit a decrease in elongation at break.     

写实人物瓷画

着重论述写实人物瓷画创作要获得形神兼备的艺术效果,必须掌握的问题和运用的有效方法。     

如何实现SAP ERP财务报表的灵活定制

如何使得一个不具备ABAP编程语言基础的财务用户能在SAP系统中快速有效地配置财务报表,并灵活定义输出格式,是许多实施SAP ERP系统的公司都会遇到的问题。本文介绍的财务模块报表定制功能旨在SAP ERP中构建一个可视化图形界面,在这个界面中定义报表、报表版本,以及每个版本的输出布局、报表行、报表列、报表单元格的取数逻辑等要素,使得用户在不使用编程工具的前提下实现报表的灵活定制。     

防止氟化铝母液脱硅工艺中铝、氟消耗方法研究

在氟化铝母液中添加氯化铝等可溶性铝盐,可有效地阻止钠,氟,铝间冰晶石固体物质的形成,从而达到防止氟化铝脱硅工艺中铝,氟的损耗,确保氟硅酸钠的产品质量,同时提高母液利用的经济效益。     

热塑性聚酰亚胺的热膨胀系数研究

利用静态热机械分析仪（TMA）测定了热塑性聚酰亚胺（TPI）注塑件的热膨胀系数α，考察了TPI的各向异性、尺寸稳定性以及添加不同填料对α的影响。结果表明：TPI存在着各向异性，且流向面的α最低。在正常的使用范围内，试样经历一个升降温循环后尺寸基本没发生变化。经消除热历史后，材料的α降低；类似地，热处理也能使。减小。在主链相同的TPI树脂中，加入玻纤、碳纤维等高强度、高热稳定性的填料有助于降低TPI的α。     

Chemical and experiential basis for rejection ofTropaeolum majus byPieris rapae larvae

Rejection of nasturtium,Tropaeolum majus, by cabbage-reared larvae ofPieris rapae has been explained by the presence of feeding deterrents in the nastrutium foliage. Sensitivity to the deterrents develops as neonate larvae feed on cabbage. The most prominent deterrent compound, which is present in nasturtium at a concentration of 40 mg/100 g fresh leaves, was identified as chlorogenic acid. When neonate larvae were fed on a cabbage leaf treated with high concentrations of deterrent-containing extracts of nasturtium foliage, they remained insensitive to the deterrents, so they accepted nasturtium when transferred as second instars. When neonate larvae were reared on a cabbage leaf treated with 0.1 mg chlorogenic acid, ca. 35% of the second instars accepted nasturtium. Similar dietary exposure of neonates to the subunits of chlorogenic acid, caffeic acid and quinic, acid resulted in much less or no effect on the rejection behavior of second instars. The results suggest that the combined effects of specific chemical constituents of nasturtium can explain the rejection of this plant by larvae ofP. rapae, but if larvae are continuously exposed to these compounds immediately after hatching, they apparently become habituated to the feeding deterrents. The lack of activity of the subunits of chlorogenic acid suggests that specific structural features are necessary for a dietary constituent to cause such habituation or suppression of sensitivity development.     

1—苯基—5—巯基四氮唑和苯并三氮唑在胶态银和硫化银上的阳极抑制效应

为了研究抑制剂对银核和硫化银核的不同作用，本工作考察了1－苯基－5－巯基四氮唑（PMT）和苯并三氮唑（BTA)作为抑制剂在银核和硫化银核上物理显影的阳极抑制和解抑制效应。实验结果表明：1）PMT和BTA对Ag核和银离子过量时制得的硫化银核，Ag2S(Ag)，的显影催化活性都有不同程度的抑制作用，而对硫离子过量时制得的硫化银核，Ag2S(S)，无明显的抑制作用，这可能是由于过量硫离子在硫化银核上的吸附要强于这两种抑制剂；2）S2O3^2-或I^-离子的存在对BTA在Ag核上有解抑制作用，不仅可恢复甚至提高Ag核的显影催化活性，而对Ag2S核的抑制作用无明显影响；3）与BTA不同，S2O3^2-或I^-离子对PMT在Ag核上没有解抑制作用，对Ag2S(Ag)核的抑制作用还稍有增强，而对Ag2S(S)核稍有减弱；4）银溶胶中的表面增强拉曼谱（SERS）测量证实：BTA在Ag核上的吸附导致Ag核显影催化活性的下降，加入S2O3^2-或I^-离子后致使BTA的SERS信号消失则意味着BTA在银核表面的脱附。以上这些结果说明阳极抑制机理在抑制效应中有重要作用。     

双核酞菁钴磺酸铵用于催化裂化汽油的脱臭

采用尿素法合成了双核酞菁钴磺酸铵;通过正交实验及单因素实验,考察了双核酞菁钴磺酸铵在液-液催化氧化法中对催化裂化汽油脱臭的最佳工艺条件:碱液质量分数为10%,催化剂加入量为1 0g·L-1,反应温度为40℃,反应时间为3min;与磺化酞菁钴和美国进口脱臭催化剂ARI100-EXL的脱硫醇效果进行了比较,结果表明双核酞菁钴磺酸铵对汽油的脱臭效果明显优越于磺化酞菁钴催化剂,与进口催化剂的脱臭效果基本相当。     

浅析村民自治在农村社会的运行及其制度完善

村民自治制度实施的质量,直接映射出我国基层民主政治的发展水平.分析和审视了我国村民自治实施中出现的观念难以转变、村委会直接选举的程序缺乏科学性与民主性、制度弹性过大等问题,提出从体制、机制与技术等层面加强村民自治制度的建设和创新,对于进一步完善我国村民自治制度,促进基层民主政治建设具有重要意义.