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|  | | 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。 | |
Synthesis of homopolymers and block copolymers of methyl methacrylate and styrene in the presence of bis(3,6-ditert-butylcatecho
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The specific features of synthesis of poly(methyl methacrylate) and polystyrene in the presence of bis(3,6-ditert-butylcatecholato)tin(IV) ditetrahydrofuranate were studied.
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With the use on macroinitiators obtained in the presence of bis(3,6-ditert-butylcatecholato)tin(IV) ditetrahydrofuranate, block copolymers were synthesized.
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über eine neue colorimetrische Methode zur Bestimmung von BHT (2,6-Ditert.-butyl-4-methylphenol)
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Die spektrophotometrische Bestimmung von 2,6-Ditert.-butyl-4-methylphenol (Ionol) (I) neben seinen Oxydationsprodukten (II-V)
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| | SNPH-bone cement is composed of methyl-methacrylate, 2, 6-ditert-butyl-p-cresol (instead of hydroquinone as stabilizer) and zirconium dioxide (instead of barium sulfate). Study on mechanical strength of the cement, bacterial culture, animal experiment in 24 rabbits and clinical application in 86 cases all demonstrated the reliability of the SNPH-bone cement. The bone cement can prevent settling and loosening prosthesis by increasing the contact area of the prosthesis bone interface, packing bone defec... | | SNPH-骨水泥是以甲基丙烯酸甲酯为主体,选用2,6—二叔丁基对甲苯酚代替常用的对苯二酚作为稳定剂,以二氧化锆代替硫酸钡作为阻光剂,因而使用更为安全,且能在X线片上满意显彩。经机械性能测试、细菌学检验、动物实验和临床观察,证实其性能良好。骨水泥由于扩大了假体与受体骨间的载荷面和发挥机械性嵌锁作用,故具有防止假体下沉或松动的作用。此外,骨水泥尚可用于充填骨缺损、加固内固定或脊柱侧凸矫正棒和作为第一,二掌骨间支撑物,以及用于掌指关节成形术作为间隔物,方法简便,效果较好。文内还讨论了骨水泥的力学作用和骨水泥植入综合征的防治。 | | 文摘来源 | | This paper presented the analytical data of volatile oils in roots,leaves and flowers of Panax ginseng C.A.Mey.,cultivated in Liaoning Province of China. 18 compounds identified by means of GC-MS-Computer appa- ratus as follows:α-guaiene 1,β-patchoulene-2,transcaryophyllene 3,humulene 4,β-elemene 5,γ-elemene 6,eremophilene 7,α-santalene 8,α-farnesene 9,β-farnesene 10,β-gurjunene 11,2,6-ditert-butyl -4-methyl phenol 12,2-methyl-tetradecane 13,n-pentadecane 14,1- heptadecanol 15,2-heptadecanone 16,palmi... | | 本文测定了辽宁产人参(Panax ginseng C.A.Mey.)根,茎叶,花中挥发油的含量,并用气相色谱——质谱——计算机联用装置分离分析了人参各部位挥发油中的化学成分及其相对含量,从油中鉴定出下列十八个化合物;α——愈创烯(α-guaiene)_1,β——广藿香烯(β-patchoulene)_2,反式——丁香烯(trans-caryophyllene)_3,蛇麻烯(humulene)_4,β——榄香烯(β-elemene)_5,γ——榄香烯(γ-elemene)_6,艾里莫酚烯(eremophilene)_7,α——檀香烯(α-santalene)_8,α——金合欢烯(α-farnesene)_9,β——金合欢烯(β-farnesene)_(10),β——古芸烯(β-gurjunene)_(11),2,6——二特丁基-4-甲基苯酚(2,6-ditert-butyl-4-methyl phenol)_(12),2-甲基十四烷(2-meth-yl-tetradecane)_(13),正十五烷(n-pentadecane)_(14),十七烷醇-1(1-heptad-ecanol)_(15),十七... | | 文摘来源 | | A new symmetrically substituted cop per phthalocyanine derivative-Cu te tra-4-(2.4-Ditert-amylphenoxy) Phthalocyanine(tap CuPc was synthesized. The effects of L-B film-forming condition on film quality was studied by UV-visible spectrophotometer and transmitting electron microscope (TEM). The surface morphology obtained from TEM shows that the L-B film prepared at optimum condition has the smooth and homogeneous surface structure. The tap CuPc L-B film was deposited onto the planner interdigital micro... | | 合成了一种新型的酞菁铜衍生物——四—4-(2、4-二特戊基苯氧基)酞菁铜(以下简称tapCuPc)。藉助紫外——可见吸收光谱和透射电镜获得的表面形貌和膜层厚度的照片,研究了成膜条件对成膜质量的影响。在最佳成膜条件下,得到了平滑而均匀的表面结构。用Langmuir-Blodgett(L—B)薄膜技术在平面又指电极上沉积LapCuPc L—B薄膜。制成高灵敏、优良选择性,快速响应和恢复特性的气敏传感原理型器件。研究了气敏响应特性。发现tapCuPc LB薄膜对NH_3具有单一的探测选择性,对NO_2,H_2S和SO_2等不敏感.当吸附NH_3时,LB薄膜的平面电导明显增加。对于空气中含有100ppm(百万分之一单位)NH_3浓度的混合气氛,得到响应时间为32s。恢复时间为13min,对空气中NH_3的探测灵敏度可达几个ppm。 | | 文摘来源 | |   | | << 更多相关文摘 |
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