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971.
Pervaporation of water-ethanol mixtures through plasma graft polymerization of acrylamide onto crosslinked hydroxyl terminated poly-butadiene (HTPB) based PU membranes, plasma graft polymerization of acrylamide onto crosslinked PU membrane (AAm-p-CPU), were investigated. The grafting was dependent on the discharge power and pretreatment period. The effects of crosslinking, plasma treatment conditions, feed compositions, and feed temperature on the performance of these membranes were studied. The physical properties of crosslinked membrane were better than those of the uncrosslinked membrane. In addition, compared with crosslinked PU membranes (CPU), the plasma modified crosslinked PU membranes effectively improve the pervaporation separation performances. 相似文献
972.
本文论述了利用气相色谱法检测石脑油中含氧化合物的方法,考察了无阀切换技术、分离模式的设计、操作条件的优化等方面的问题。提出利用多维气相色谱法,采用一根非极性柱和一根极性柱进行独立和串联分离,通过改变辅助载气压力的无阀切换方式进行柱分离,应用双FID检测器进行信号检测,数据利用Agilent的chemestation工作站采集和输出。该方法操作简单,分析时间在23 min以内,重复测定结果的相对标准偏差(RSD)小于1.5%,标准加入回收率在95~105%范围内,方法准确可靠。 相似文献
973.
PBT/PC/E-MA-GMA三元共混体系的力学性能与亚微相态 总被引:1,自引:0,他引:1
将乙烯-丙烯酸甲酯-甲基丙烯酸缩水甘油酯(E-MA-GMA)三元共聚物与聚碳酸酯(PC)增韧聚对苯二甲酸丁二酯(PBT),研究了其力学性能、亚微相态和强韧化机制。结果表明,当m(PBT)/m(PC)为50:50,三元共混体系在w(E-MA-GMA)为10%时,缺口冲击强度达93 kJ/m2,同时拉伸强度达到54 MPa。扫描电子显微镜观察发现,E- MA-GMA作为柔性界面层,起到反应性增容作用,使PC分散相的相畴尺寸变小。PC相特有的相形态以及柔性界面层的存在是三元共混体系强韧化的主要机制。 相似文献
974.
计及各种载荷时的外压元件设计——新版(2007)ASME Ⅷ-2介绍 总被引:3,自引:0,他引:3
对2007版ASMEⅧ-2提出的在各种载荷作用时的外压元件设计进行简要分析并介绍。 相似文献
975.
The influence of Glu44 and Glu56 of cytochrome b5 on the protein structure and interaction with cytochrome c 总被引:1,自引:0,他引:1
Sun Yu-Long; Xie Yi; Wang Yun-Hua; Xiao Gu-Tian; Huang Zhong-Xian 《Protein engineering, design & selection : PEDS》1996,9(7):555-558
The gene encoding trypsin-solubilized bovine liver microsomalcytochrome b5 (82 residues in length) has been mutated, in whichthe codons of Glu44 and Glu56 were changed to those of Ala.The mutated genes were expressed in Escherichia coli successfullyand three mutant proteins (E44A, E56A and E44/56A) were obtained.The UV-visible, CD and 1H NMR spectra of proteins have beenstudied. The results show that the mutagenesis at surface residuesdoes not alter the secondary and tertiary structures of cytochromeb5 significantly. The interactions between recombinant cytochromeb5 and its mutants with cytochrome c were studied by using opticaldifference spectra. The results demonstrated that both Glu44and Glu56 of cytochrome b5 participate in the formation of acomplex between cytochrome b5 and cytochrome c. 相似文献
976.
977.
本文对多媒体技术在化工热力学教学中的应用进行了探讨,提出了在应用多媒体技术时应注意的问题。 相似文献
978.
979.
A chitosan (CTN)/silica‐supported nanosized palladium catalyst was obtained from a silica‐supported chitosan palladium complex through a complex transition method. An adsorption model was employed to simplify the structure of the di‐supporter. It was indicated that when the polymer coil adsorbed on the silica surface with even a monolayer the catalytic activity would reach an optimum value, and different situations of the, nanosized palladium particles would cause a different catalysis. The molar ratio of the chitosan structure unit to the palladium would affect the metal's size, which therefore influenced its catalytic activity. The experimental results corresponded with the inferences. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 989–994, 2002 相似文献
980.
Summary The ring-opening polymerization of 2-phenyl-1,3,-6,2-trioxaphosphocane (4), an eight-membered cyclic phosphonite, has been investigated. Cationic initiators of PhCH2-Cl and MeOTf gave polymers, whereas anionic and radical initiators did not yield polymer. The structure of polymer was examined by IR, 1H, 31P, and 31C NMR spectroscopy of polymers and elemental analysis as well as the alkaline hydrolysis products. The polymer consisted of two different units, i.e., the major part is the normal phosphinate structure 5 and the minor part is the isomerized unit 6 in 7% with PhCH2Cl initiation and in 34% with MeOTf initiator. The difference in nature of propagating species from these two initiators are discussed in connection with their reactivities.On leave from the Institute of Chemistry, Academia Sinica, Beijing, China 相似文献