全文获取类型
收费全文 | 29154篇 |
免费 | 4095篇 |
国内免费 | 2690篇 |
专业分类
化学 | 20099篇 |
晶体学 | 284篇 |
力学 | 1905篇 |
综合类 | 273篇 |
数学 | 3275篇 |
物理学 | 10103篇 |
出版年
2024年 | 73篇 |
2023年 | 568篇 |
2022年 | 616篇 |
2021年 | 856篇 |
2020年 | 1098篇 |
2019年 | 1055篇 |
2018年 | 874篇 |
2017年 | 776篇 |
2016年 | 1224篇 |
2015年 | 1170篇 |
2014年 | 1477篇 |
2013年 | 1983篇 |
2012年 | 2560篇 |
2011年 | 2657篇 |
2010年 | 1647篇 |
2009年 | 1633篇 |
2008年 | 1736篇 |
2007年 | 1660篇 |
2006年 | 1489篇 |
2005年 | 1227篇 |
2004年 | 940篇 |
2003年 | 789篇 |
2002年 | 751篇 |
2001年 | 561篇 |
2000年 | 558篇 |
1999年 | 651篇 |
1998年 | 578篇 |
1997年 | 574篇 |
1996年 | 659篇 |
1995年 | 506篇 |
1994年 | 464篇 |
1993年 | 388篇 |
1992年 | 371篇 |
1991年 | 322篇 |
1990年 | 255篇 |
1989年 | 202篇 |
1988年 | 157篇 |
1987年 | 136篇 |
1986年 | 127篇 |
1985年 | 118篇 |
1984年 | 87篇 |
1983年 | 60篇 |
1982年 | 41篇 |
1981年 | 36篇 |
1980年 | 17篇 |
1978年 | 19篇 |
1977年 | 23篇 |
1976年 | 20篇 |
1975年 | 28篇 |
1974年 | 27篇 |
排序方式: 共有10000条查询结果,搜索用时 250 毫秒
991.
992.
Xin-Jian Lei Fei-Long Jiang Da-Xu Wu Mac-Chun Hong Zhi-Ying Huang Han-Qin Liu 《中国化学》1993,11(1):40-44
[V_2(μ-S_2)_2(S_2CNEt_2)_4].2CH_3Cl was synthesized by the reaction of NaS_2CNEt_2,Li_2S andVOCl_3 at room temperature.Crystal data:M=1061.3,space group Pbca,with the orthorhombicparameters:a=20.123(3),b=20.485(4),c=10.911(3),V=4497.7,Z=4,D_c=1.57g/cm~3,Mo Kσradiation(λ=0.71069()?),μ=13.2 cm~(-1),F(000)=2168.Final R=0.041 and R_w=0.047 for 2288 ob-served reflections with I>3σ(1).The coordination sphere of each V atom in title compound is a dis-torted tetragonal prism composed of two bidentate dithiocarbamate and two S_(2~((2-)) ligands.The V—Vdistance is 2.890 while the V—S distances fall in the range of 2.422—2.505. 相似文献
993.
Bing Yang Jianfeng Zhao Zepeng Wang Zhenlin Yang Zongqiong Lin Yanni Zhang Jiewei Li Linghai Xie Zhongfu An Hongmei Zhang Jiena Weng Wei Huang 《中国化学快报》1990,30(11):1969-1973
As facile,green,low-cost as possible:One more electron-deficient azaacene (TCAF) with deep LUMO (-4.52 eV), strong electronic affinity,excellent yield,and simple purification procedure was successfully created and explored as good electron injection material.It is believed TCAF would be a promising and pervasive acceptor material and bring in more significant achievements to green and sustainable organic electronics including OLEDs,OFETs,OPVs, and perovskite solar cells,etc. 相似文献
994.
With the accelerated accumulation of genomic sequence data, there is a pressing need to develop computational methods and advanced bioinformatics infrastructure for reliable and large-scale protein annotation and biological knowledge discovery. The Protein Information Resource (PIR) provides an integrated public resource of protein informatics to support genomic and proteomic research. PIR produces the Protein Sequence Database of functionally annotated protein sequences. The annotation problems are addressed by a classification-driven and rule-based method with evidence attribution, coupled with an integrated knowledge base system being developed. The approach allows sensitive identification, consistent and rich annotation, and systematic detection of annotation errors, as well as distinction of experimentally verified and computationally predicted features. The knowledge base consists of two new databases, sequence analysis tools, and graphical interfaces. PIR-NREF, a non-redundant reference database, provides a timely and comprehensive collection of all protein sequences, totaling more than 1,000,000 entries. iProClass, an integrated database of protein family, function, and structure information, provides extensive value-added features for about 830,000 proteins with rich links to over 50 molecular databases. This paper describes our approach to protein functional annotation with case studies and examines common identification errors. It also illustrates that data integration in PIR supports exploration of protein relationships and may reveal protein functional associations beyond sequence homology. 相似文献
995.
Two‐dimensional (2D) organic nanomaterials are attracting increasing research interest and expected to be the ideal candidate for future‐ proofed flexible electronics and biotechnologies. Owing to the complex molecular structures and multiple intermolecular interactions in organic systems, deeper understanding of rational molecular design and assembly principles is urgently required. In this review, a collection of molecular packing mode in the 2D organic nanomaterials via supramolecular assembly is presented, so as to help explicit the relationship among molecular structures, supramolecular interactions and molecular packing motifs in 2D assembly systems. We also provide a rational and accessible schematic model to demonstrate several typical kinds of molecular packing motifs for the prediction of the 2D morphology. 相似文献
996.
997.
Ying-nan Xuan Yan Gao Yong Huang Xi-gao Jian Laboratory of Cellulose Lignocellulosics Chemistry Guangzhou Institute of Chemistry Chinese Academy of Sciences Guangzhou China Institute of Chemistry Chinese Academy of Sciences Beijing China Department of Polymer Science College of Chemical Engineering Dalian University of Technology Dalian China 《高分子科学》2002,(3):225-229
A kind of novel heat-resistant, high performance engineering thermoplastic phthalazinone poly(aryl ether sulfoneketone) (PPESK) containing a carboxyl group in its side chain was prepared by the nucleophilic displacement reaction of 4-(4-hydroxylphenyl)-1(2H)-phthalazinone with di(4-chlorophenyl) sulfone, 4,4'-difluoro-benzophenone and phenolphthalin insulfolane in the presence of K_2CO_3 to produce high molecular weight polymers which can be dissolved in some polarsolvents such as chloroform and nitrobenzene at room temperature and can be easily can into flexible, yellowish andtransparent films. PPESK is an amorphous polymer having a decomposition temperature above 400℃, which indicates that ithas high thermal stability. At the same time, the thermal properties of PPESKs with dicyandiamide (DICY) as curing agentindicated that the heat-resistance properties of the PPESKs are improved after curing. The apparent activation energy (ΔE) ofthe cross-linking reaction and the reaction order (n) of PPESK/DICY were found to be 52.2 kJ/mol and ca. 1.0, respectively.Therefore, the cross-linking reaction is approximately a first order reaction. 相似文献
998.
999.
7-(对甲酰基苯偶氮)-8-羟基喹啉-5-磺酸的合成及其双波长分光光度法测定镓 总被引:1,自引:0,他引:1
7-(对甲酰基苯偶氮)-8-羟基喹啉-5-磺酸是一新显色剂。该试剂在微碱性介质中(pH=7.5)与镓形成黄色络合物。络合物λmax=392nm,摩尔吸光系数ε392=2.24×104L·mol-1·cm-1。同时在500nm呈现负峰,用双峰观波长法测定镓ε392~500=6.89×104L·mol-1·cm-1,灵敏度是单波长法的三倍多.线性范围0~2.0×10-5mol/L。用拟定的方法测定了掺硅的GaAS材料及岩石中的镓,加入回收率为106%~110%;方法的相对标准偏差小于1.6%。 相似文献
1000.
以脉冲激光在高真空中溅射钒粉和硫粉的混合物,产生了一系列钒硫原子簇正负离子。根据对其实验记录的激光等离子体质谱进行分析,发现钒硫原子簇的化学键基本上是共价型的,对应于相同钒原子数目的正负离子的相对丰度分别符合于不同形式的对数正态分布。正离子的相对丰度随硫原子数的增加呈对数衰减,由此可以确定各种大小簇合物的簇骼与几何构型;负离子的相对丰度则基本上呈正常的正态分布,说明在簇骼上结合了不同数量硫原子的负离子之结构稳定性大致相近。在实验中还观察到一类硫原子含量较高的簇离子,其中的部分硫原子可能在本身成键形成环状的硫集团后,又与原来的簇骼结合,因而在硫原子数较多时它们的相对丰度符合另一条对数正态分布曲线。 相似文献