Surface modification of a biomedical poly(ester)urethane by several low‐powered gas plasmas

Several low‐powered gas plasmas were employed to treat a biomedical poly(ester)urethane using the treatment gases of CO₂, O₂, NH₃, and SO₂ with different treatment time (2, 5, 10, and 15 min). The changes of the physical and chemical characteristics of the biopolymer surface were studied. Surface morphology was evaluated by scanning probe microscopy, which showed increased roughness of the surface after plasma treatment. The wettability of the surface was examined by static water contact angle (SCA) measurements, which presented that there was a decrease of SCA in all plasma treatments compared with the untreated surface and that each gas plasma had an optimum treatment time accompanied by a minimum contact angle. X‐ray photoelectron spectroscopy indicated the changes of the surface functional groups. The data demonstrated that CO₂ and O₂ plasmas resulted in the incorporation of oxygen‐containing groups, while NH₃ plasma resulted in the combination of nitrogen‐containing groups, and SO₂ plasma resulted in the formation of sulfur‐containing groups. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 1273–1282, 2006     

用弯曲模型推导二组元复合材料杨氏模量新公式

用弯曲模型推导了适用于悬丝耦合弯曲共振法检测金属第二组元的杨氏模量的理论公式。通过实验数据计算。结果表明在两组元h2/h1≈1时与文献[2]的计算结果几乎接近，为用悬丝耦合弯曲共振法检测各种减振材料，陶瓷材料杨氏模量提供了理论公式；同时用改进后的弯曲模型推导出了适用于纤维复合材料横向杨氏模量的预测公式。     

PH敏感性水凝胶的分子热力学模型

本工作是在非离子凝胶的分子热力学模型基础，引入Ｄｏｎｎａｎ平衡项和大分子离子链的静电排斥项对凝胶自由能的贡献，建立了一个新的离子凝胶的分子热力学模型。该模型在解释离子凝胶的ＰＨ敏感性及其各种影响因素，以及预测ＰＨ溶胀曲线方面都取得了较好的效果。     

国外过氧化氢在化学合成中应用研究进展

介绍了近期国外过氧化氢在部分化学品合成中应用研究新进展 ,产品包括过碳酸钠、过碳酰胺、4Na2 SO4·2H2 O2 ·NaCl加合物、叔胺氧化物、水合肼、二羟基苯、季铵盐过氧化氢和甲乙酮肟。内容涉及产品质量 (纯度、安定性、溶解速率、外观等 )、产品收率、催化剂、工艺过程等方面改进。主要介绍专利技术。     

玻纤增强PA66／PP合金的特性及应用

介绍玻纤增强ＰＡ６６／ＰＰ合金的制备工艺及特性，与纯尼龙６６树脂相比，加工性能好，综合性能优异。该材料适用于中小型油浸式变压器的分接开关及其它绝缘部件。     

用RAP法引上技术生长KCL晶体

用RAP法(reactivo atmosphere process)处理KCl熔体,在不改变生长气氛和RAP继续处理的情况下,提拉生长KCl晶体,以解决高纯、大尺寸、生长速度快、成品率高和有较大经济效益的问题。     

空压机组汽轮机排气压力、温度高原因分析及解决方法探讨

1概况 空压机汽轮机组是空分装置原料和动力的提供者,主要由空压机和工业汽轮机两部分组成.汽轮机为注入凝汽式汽轮机,型号NK-32/36/16-3,级数为1冲动级15反动级,功率9022kW,额定转速7270 r/min,主蒸汽压力6.9 Mpa,主蒸汽温度550℃,主蒸汽流量通常31.9t/h,最大36.8t/h,排汽压力通常0.015MPa,最大0.04MPa,排汽温度通常55℃,最大120℃.但由于多种原因,注汽一直未投,平常为全凝汽式运行.     

陕北无定河流域土壤侵蚀与植被覆盖和降雨关系研究

基于2000—2014年陕北无定河流域日降水、DEM、土壤类型、MODIS NDVI等数据,利用修正通用土壤流失方程(RUSLE)估算了流域土壤侵蚀情况,定量分析了植被覆盖和降雨在土壤侵蚀中的作用,结果表明:(1)无定河流域土壤侵蚀以微度侵蚀为主,平均占流域面积的88.35%,各土壤侵蚀等级面积比例随等级的升高而降低。2000—2014年微度侵蚀面积比例为下降趋势,轻度及以上等级面积比例均为上升趋势。(2)不考虑降雨因子影响时,无定河流域仍以微度侵蚀为主,且为增加趋势,而其他土壤侵蚀等级均为下降趋势。不考虑植被覆盖因子时,流域土壤侵蚀与模型计算结果的变化趋势基本一致。(3)植被覆盖对土壤侵蚀面积比例和变化速率的贡献率分别为13.67%和24.55%,而降雨作用达到86.33%和75.44%,表明降雨是流域土壤侵蚀的主要动力和控制因子,降雨变化主导着流域土壤侵蚀变化过程。     

Low-temperature catalytic growth of carbon nanotubes under microwave plasma assistance

Various carbon nanotubes (CNTs) including aligned arrays, Y-branching and some other novel morphologies have been catalytically grown on anodic porous alumina template (APAT) and on the alumina-supported catalysts with methane (or benzene) as carbon source under microwave plasma assistance below 520 °C. The growth process could be simply operated since neither heating nor bias-voltage was applied to the catalysts or APAT. The results presented in this paper not only greatly richened the nanostructures of carbon family but also provided with a new technique path for synthesizing CNTs or some other nanostructures with the characteristics of low-temperature which has some special advantages or applications.     

流行性出血热病毒在地鼠肾细胞中增殖动态的形态学及形态发生学研究

用普通电镜及免疫电镜对流行性出血热病毒(EHFV)不同毒株感染地鼠肾细胞(GHKC)的形态及形态发生学特点、其特征性包含体的形态及感染细胞超微结构的改变,以及感染后不同天数的病毒增殖动态进行了观察。