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21世纪是信息科学、合成化学和生命科学共同繁荣的世纪 总被引:23,自引:0,他引:23
从几个不同的角度阐述了21世纪是信息科学、合成化学和生命科学共同繁荣的世纪。(1)社会和青年学生对化学的质疑;(2)20世纪的化学取得了空前辉煌的成就;(3)20世纪发明了七大技术,最重要的是信息技术、化学合成技术和生物技术;(4)21世纪是信息科学、合成化学和生命科学共同繁荣的世纪;(5)化学是一门社会迫切需要的中心科学,她与生命、材料、信息、环境、能源等新兴科学都有非常密切的联系,产生了许多重要的交叉学科,但化学作为中心学科的形象反而被其交叉学科的巨大成就所埋没;(6)化学有没有理论;(7)21世纪化学的四大难题;(8)解决了化学的四大世纪难题后的美好前景;(9)21世纪的化学不但要认识世界、改造世界,而且还要保护世界;(10)我国化学基础研究取得了显著进展;(11)几点希望和建议。 相似文献
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根据科研工作和培养人才需要,北京理工大学冯长根教授招收具有化学学科背景的硕士博士生若干名。欢迎应届或历届毕业生报考。研究课题为:(1)汽车尾气催化净化剂化学;(2)植物医药的化学研究;(3)加速量热仪(ARC)在化学物品的化学安全性稳定性及有关性能中的应用;(4)非线性化学动力学;(5)燃烧化学(含爆炸化学);(6)固体中的快速化学反应;(7)小型微型器件中的化学。报考者请与冯长根教授联系。地址:北京理工大学机电工程学院 邮编:100081电话:010-68912764 传真:010-689… 相似文献
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2005年Pittcon会议续报如下:生物材料表面和界面的化学成像技术组报告有:(1)DG Castner,应用x射线的生物和有机物表面的成像技术——光发射电子显微术和x射线光电子能谱技术的研究;(2)N Winograd,应用聚束表面电离质谱技术进行单个生物细胞的三维化学成像的前景;(3)R MCorn,供蛋白质和脱氧核糖核酸微阵列用的酶法表面等离子体激元共振成像技术;(4)B Hagenhoff,生物材料表面和界面的化学成像技术;(5)PS Weiss,膜-细胞骨架和膜-表面相互作用的物理模型。 相似文献
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AlN粉末合成研究进展 总被引:4,自引:0,他引:4
综述了国内外AlN粉末合成的最新进展,内容涉及AlN粉末合成的主要方法和表面处理。包括:(1)铝粉直接氮化法;(2)化学气相积法;(3)碳热还原法;(4)裂解法;(5)表面处理。 相似文献
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论化学对象的历史演化廖正衡(辽宁师范大学科学史所,大连116022)周广东(辽宁教育出版社,沈阳110001)化学对象,从客观上来看是物质的化学运动即物质分子的转变运动,这是不变的;然而从主观上来看,由于人们在不同历史发展时期对于化学运动和化学科学认... 相似文献
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计算机化学应用软件介绍 总被引:1,自引:0,他引:1
计算机化学应用软件介绍忻新泉,洪汇孝(南京大学化学系210008)编者按:随着计算机应用的发展和普及,计算机与化学的关系愈来愈密切、愈来愈受到重视。化学专用的软件包已大量出现;辅助化学教学的CAI软件也层出不穷、各具特色、广泛应用;各高等院校在教学管... 相似文献
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荧光法用于新型抗癌配合物pd(tcd)(NO3)2初步筛选及作用机制研究 总被引:2,自引:0,他引:2
荧光法用于新型抗癌配合物Pd(tcd)(NO3)2初步筛选及作用机制研究李志良ab毕琼斯a李俊忠ab熊劲芳a林辉祥ab俞汝勤a(a湖南大学化学化工系长沙410082;b湖南大学化学生物医药研究所长沙410082)化学药物治疗是治疗癌症的重要手段之一,... 相似文献
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用溶胶-凝胶法以磷钼酸(MPA)的镍盐溶液水解钛酸四丁酯制备了NiPMo/TiO2催化剂.使用ICP、 XRD、 TG-DTA、 IR、 TPD-MS和微反应技术研究了催化剂的化学组成、热稳定性、化学吸附性质和催化反应性能.杂多钼酸盐与TiO2通过O2-在TiO2表面发生了键合.在623 K下,杂多阴离子仍保持原有的Keggin结构.CO2在Lewis酸位Ni(Ⅱ)和Lewis碱位Ni-O-Mo的桥氧协同作用下生成CO2卧式吸附态Ni(Ⅱ)←O-(CO)←(O--Ni).丙烯有多种吸附态在催化剂上吸附.在563 K、 1 MPa和空速1500 h-1的反应条件下,丙烯的摩尔转化率为3.2%,产物MAA选择性为95%. 相似文献
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Toward new camptothecins. Part 6: Synthesis of crucial ketones and their use in Friedländer reaction
Laurent Gavara Thomas Boisse Jean-Pierre Hénichart Adam Daïch Philippe Gautret 《Tetrahedron》2010,66(38):7544-5571
In the context of the preparation of camptothecin and luotonin A analogs, the synthesis of some key keto-precursors and their use in Friedländer condensation are described. This paper also focuses on the stability of these keto intermediates and emphasizes the major differences between indolizinones and pyrroloquinazolinones series. Noteworthy is also the report of some original structures isolated as by-products of some experiments. 相似文献
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The Langevin paramagnetic theory can’t describe the relation between magnetization of ferrofluids and applied magnetic field. The structuralization of ferrofluids, which is considered the main influence factor of the magnetization, is regarded. The part of magnetization works is deposited when the structure is forming. This action influences the magnetization of ferrofluids directly or indirectly. On the base of the “compressing” model, the Langevin function that usually describes the magnetization of ferrofluid is modified, and a well-fitted curve is obtained. An equation of the relation between the equivalent volume fraction after being “compressed” and the intensity of magnetic field is discovered, which approximately describes the process of magnetization. The relation between the approximate initial susceptibility and the volume fraction can be obtained from modified formula. 相似文献
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Rebecca J. Burton Mandy L. CrowtherNeal J. Fazakerley Shaun M. FilleryBarry M. Hayter Jason G. KettleCaroline A. McMillan Paula PerkinsPeter Robins Peter M. SmithEmma J. Williams Gail L. Wrigley 《Tetrahedron letters》2013
The highly regioselective Buchwald–Hartwig amination at C-2 of the cheap and readily accessible reagent, 2,4-dichloropyridine with a range of anilines and heterocyclic amines is described. This new methodology is robust and provides a facile access to 4-chloro-N-phenylpyridin-2-amines on 0.25 mol scale. These intermediates undergo a further Buchwald–Hartwig amination at higher temperature to enable rapid exploration of the chemical space at C-4 and to provide a library of 2,4-bisaminopyridines. 相似文献
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KMnO4-mediated oxidative CN bond cleavage of tertiary amines producing secondary amine was introduced, which was trapped by electrophiles (acyl chloride and sulfonyl chloride) to form amides and sulfonamides. The reaction could take place at mild condition, tolerating a wide range of function groups and affording products in moderate to excellent yields. 相似文献
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N. A. Nedolya 《Chemistry of Heterocyclic Compounds》2008,44(10):1165-1219
The review contains a concise historical account and information on the most significant researches undertaken by the staff
at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences on the Chemistry
of Heterocyclic Compounds.
Dedicated to Academician of the Russian Academy of Sciences B. A. Trofimov on his 70th jubilee.
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1443–1502, October, 2008. 相似文献
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Regiospecific and direct imidation of the methyl C(sp3)–H bond of thioanisoles is realized under mild and metal-free conditions with N-fluorobis(benzenesulfonyl)imide as an oxidant and nitrogen source. Proposed mechanism suggests that thionium ion intermediates and a Pummerer-type reaction are involved. The imidation has advantages such as high step-economy, excellent functionality tolerance, and regiospecificity, giving structurally diverse imidation products. 相似文献
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《Tetrahedron》2014,70(21):3377-3384
The Rh(II)-catalyzed reaction of 2-carbonyl-substituted 2H-azirines with ethyl 2-cyano-2-diazoacetate or 2-diazo-3,3,3-trifluoropropionate provides an easy access to 2H-1,3-oxazines and 1H-pyrrol-3(2H)-ones. These compounds can be selectively prepared from the same starting material using temperature as the only varied parameter. The 2-azabuta-1,3-diene intermediate, a common precursor for both heterocyclic products, isomerizes into 2H-1,3-oxazine under kinetic control, while 1H-pyrrol-3(2H)-one is the sole product of the reaction at elevated temperatures. According to DFT-calculations a one-atom oxazine ring contraction involving ring-opening to a 2-azabuta-1,3-diene intermediate, followed by a 1,5- and 1,2-prototropic shift leads to the consecutive formation of imidoylketene and azomethine ylide, which then further undergo cyclization to the pyrrole derivative. 相似文献
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Different approaches for the synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives from simple amino acids have been investigated. A library of 33 precursors for the preparation of N-hydroxy pyrazinones was obtained in moderate to good yields. 相似文献