聚酯经营 风云变幻

回顾了 2 0 0 0年世界聚酯的发展状况 ,分析了 2 0 0 1年聚酯经营的现状 ,指出聚酯工业正面临着风云变幻的境地 ,并提出发展聚酯工业的建议。     

硬质聚氯乙烯管专用树脂

采用电镜分析、反相色谱、毛细管流变仪和布拉本达塑性仪研究了由锦西化工研究院生产的ＰＶＣ管用树脂的颗粒形貌、比表面积、流变性能和加工速率。结果表明，该树脂和疏松型树脂的形貌呈棉桃状不同，外形为球状，比表面积较大，约比普通ＳＧ－５型树脂增加１倍，最高可达１．００７ｍ＾２／ｇ；在从低剪切到高剪切速率范围内，该树脂的表观粘度均比ＳＧ－５型树脂低，不论是采用粒料还是粉料挤出，在聚合度相同时，该树脂的挤出速率     

Reprint of “Suppressing propylene carbonate decomposition by coating graphite electrode foil with silver”

A method has been developed to suppress the decomposition of propylene carbonate (PC) by coating graphite electrode foil with a layer of silver. Results from electrochemical impedance measurements show that the Ag-coated graphite electrode presents lower charge transfer resistance and faster diffusion of lithium ions in comparison with the virginal one. Cyclic voltammograms and discharge-charge measurements suggest that the decomposition of propylene carbonate and co-intercalation of solvated lithium ions are prevented, and lithium ions can reversibly intercalate into and deintercalate from the Ag-coated graphite electrode. These results indicate that Ag-coating is a good way to improve the electrochemical performance of graphitic carbon in PC-based electrolyte solutions.     

Adaptive Safety Motion Control for Underactuated Hovercraft Using Improved Integral Barrier Lyapunov Function

International Journal of Control, Automation and Systems - In this paper, we investigate the problem of safety motion control for an underactuated hovercraft from subject to safety constraint on...     

姚培谦家世生平考论

姚培谦,清初著名学者,松江人,主要活动于雍正、乾隆两朝。其一生侘傺不偶,境遇轗轲,却能泰然处之,恬淡忘机,气节人品为时所重。姚培谦出身金山望族,其家族德业为乡邦式,崇文尚学、风雅仁爱之宗风延播子孙,对姚培谦之人生观、学术观、文学观之形成皆有影响。     

Evolution of insoluble eutectic Si particles in anodic oxidation films during adipic-sulfuric acid anodizing processes of ZL114A aluminum alloys

The effects of insoluble eutectic Si particles on the growth of anodic oxide films on ZL114A aluminum alloy substrates were in-vestigated by optical microscopy (OM) and scanning electron microscopy (SE...     

基于解析解的四阶PDE曲面裁剪方法

该文提出了一种可以广泛应用于四阶PDE曲面的裁剪方法。利用PDE的参数域内的曲线在曲面上投影,得到所求裁剪曲面的边界曲线,然后通过边界曲线的导矢与曲面在边界曲线处的法向量得到边界曲线处的跨界导矢,最后以求得的裁剪曲面的边界曲线以及裁剪曲面在边界曲线处的跨界导矢为PDE曲面的边界条件,用四阶的PDE曲面方程求得PDE裁剪曲面。     

Differences in electrochemical corrosion behaviours between selective laser melted and wrought Ti6Al4V alloys in acid fluoride-containing artificial saliva

Journal of Applied Electrochemistry - In this work, the electrochemical corrosion behaviours of selective laser melted (SLMed) and wrought Ti6Al4V alloys in acid fluoride-containing artificial...     

Weathering modification of acrylic emulsion by introducing UV absorbing groups

A new kind of UV-absorbing silicon-fluorinated acrylic emulsion was prepared by emulsion polymerization with 4-allyloxy-2-hydroxybenzophenone, 3-methacryloxypropyltrimethoxysilane (MPS) and hexafluorobutyl methacrylate (HFMA) as functional monomers. The emulsion and its coating were characterized by transmission electron microscope, Fourier transform infrared spectrum (FTIR), X-ray photoelectron spectroscopy, ultraviolet absorption spectrum,thermo-gravimetric analysis, water contact angle (CA), and artificial accelerated aging test. The results indicated that the emulsion with core-shell structure was synthesized and showed prominent absorption peaks at 320 and 350 nm. The water CA of the coating was increased from 70.2° to 86.7° because of the incorporated HFMAs and MPSs. Both of the initial and final decomposition temperatures of the coating were increased by more than 20°C compared with those of the unmodified coating. After 10 days of accelerated aging, the color difference (ΔE) and rate of loss of gloss (ΔG) were only 2.78% and 5.22%, while those of the unmodified coating were as high as 22.94% and 78.57%, respectively. Because of the UV absorbers were incorporated by chemical reaction, the new coating had a more durable and effective anti-ultraviolet performance compared with the coatings the UV absorbers were introduced by physical blending.     

TiCp/Al预制块在Mg中熔化过程研究

将TiCp／Al预制块以不同的工艺加入到Mg液中进行熔化试验。结果表明，未搅拌时TiCp／Al预制块在800℃的Mg液中保温60min后仍不熔化，采用合适的搅拌工艺可使TiCp／Al预制块熔化，并且使TiC粒子在熔体中均匀分布。TiCp／Al预制块在Mg液中的熔化过程机理为：基体Al通过熔化和对淹扩散进入到Mg液中，TiC粒子间的结合力需通过搅拌产生的剪切力才能破坏，并随Mg液流动进入到Mg液中，机械搅拌可使TiC粒子Mg液中均匀分布。