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Abstract: Methanesulfonic acid method was used to prepare five acylated chitins.Except heptanoyl chitin, four of them,i.e.acetyl chitin,propionyl chitin,butyryl chitin and hexanoyl chitin,had high degree of substitution(from 1.5 to 2.0)and exhibited lyotr
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文摘:四种羧酰化甲壳素即乙酰化、丙酰化、丁酰化和己酰化甲壳素在二氯乙酸溶液中均呈现胆甾型溶致液晶相.临界浓度随侧基长度增加而略有增加，衍生物的临界浓度明显都比原甲壳素高许多，这些规律都可以用链刚性的变化来解释.四种羧酰化甲壳素在剪切时均能形成条带织构，而且能形成条带织构的最低浓度有明显差别，随侧基长度增加而提高，进一步表明侧基较长，液晶性减少. |
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Abstract: Methods and main equipment of waste heat recovery in sulphur-buring sulphuric acid plants are described.
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文摘:系统阐述了硫磺制酸生产过程中的废热回收方法、主要设备和提高热回收率的措施。 |
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Abstract: Micellization of block copolymers in selective solvents was reviewed with 69 references. The structure, kinetics, dynamics and hydronamics behavior of the formation of block copolymer micelles were discussed.
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文摘:综述了近20年来在选择性溶剂中嵌段聚合物缔合行为的研究进展，探讨了胶束结构、表征方法及胶束形成的热力学、动力学和流体力学。 |
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Abstract: Microcircuit speciments respectively made of 4 kinds of molded plastic and 2 kinds of coating material for chip have been stored at Xisha Natural Exposure Station for 22 months.
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摘要：对4种模塑封装材料、两种芯片涂层材料封装的微电路样品在西沙天然暴露站进行了22个月的贮存试验，并设计制作了一种简便有效的测试系统。 |
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Abstract: Middle Chinese adverb Geng was used in a varity of grammatical meanings: expressing a tone of transition or rhetoric question ; the repeated occurrence of actions; and the reaching of a further degree .The semantic direction of Geng is more comp
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文摘:中古汉语副词“更”语法意义比较复杂，既可表示转折或反诘语气，也可表示动作行为、情况反复、轮迭进行或出现，还可表示程度的加深；在语义指向上，副词“更”既可指向主语、谓语，还可以指向多个成分。 |
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Abstract: Migatronic DK come to Suzhou to cooperate with Weida Group and established Suzhou Migatronic.We focus our attention on R&D,the advanced technology of Migatronic and the large distributor's net of Weida Group will provide Suzhou Migatronic with h
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文摘:丹麦米加尼克来到苏州与四川威达集团合作成立了苏州米加尼克.我们致力于技术的研发,米加尼克的先进技术与威达的强大营销网络结合为苏州米加尼克提供了强大的竞争力.我们为欧洲市场提供高品质的焊接机器,客户包括知名的马士基集装箱、奥迪、法拉利等.同时我们有很多合作伙伴,他们是来自对焊接技术有巨大需求的造船工业. |
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Abstract: Modern signal processing and pattern recognition have been playing an increasing important role in ultrasonic nondestructive testing and evaluation.
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文摘:现代信号处理与模式识别技术在超声无损检测与评价中的作用愈来愈重要。 |
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Abstract: Molecular deposition (MD) film, a nano film, is assembled by the interaction of static charge between cationic and anionic compounds.The micro-friction properties of an MD film on silica has been studied with atomic force microscope (AFM).It has
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文摘:利用原子力显微镜对石英岩表面单层分子沉积膜的微观摩擦特性进行了研究，发现该分子沉积膜具有一定的减摩性.通过对其表面力-位移曲线、表面形貌像、调制力像和摩擦力像的进一步分析表明，石英岩表面分子沉积膜具有减摩作用的原因在于它能够降低表面的粘着力并对表面具有微观修饰作用. |
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Abstract: Nanjing was the capital city in early Ming Dynasty, as well as the place Zheng He worked and lived for a long time.The position of the capital city, Zheng He's relics all around Nanjing, especially the site of Longjiang Treasure Ship Factory, sh
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提要：南京是明初的国都，也是郑和长期工作和生活的地方，无论从南京作为国都的地位，还是从遍布南京的郑和遗迹，特别是龙江宝船厂遗址的存在，都表明南京是郑和下西洋的策源地。 |
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Abstract: Nano TiO2 was dip-coated on active air purification sieve of active carbon.The purification effect of this sieve against various polluting gases were investigated.The result showed that purification effects on H2S,NH3,HCHO,CO,and toluene were no
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文摘:采用浸涂法在活性炭空气净化网上负载纳米二氧化钛，在紫外光的照射下，净化网对一氧化碳、甲醛、硫化氢等污染物的净化能力明显增强，对比实验表明，在紫外光照射下光催化剂使被吸附的污染物发生降解反应而提高活性炭的净化能力。 |
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Abstract: Necessities for construction design were expounded from quality,expense,schedule and safety control etc.with an example of the xylene to wer in the PX unit.Suggestions for construction design was put forward.
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文摘:以某石油化工总厂PX装置二甲苯塔为例，从质量、费用、进度和安全控制全过程的角度，阐述了对大型塔器的设计、制造和安装一体化的要求，即可施工性设计的必要性，并对如何在工程建设全过程中做好可施工性设计提出了建议。 |
