首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1046篇
  免费   90篇
  国内免费   162篇
化学   786篇
晶体学   18篇
力学   30篇
综合类   13篇
数学   159篇
物理学   292篇
  2024年   1篇
  2023年   8篇
  2022年   11篇
  2021年   22篇
  2020年   16篇
  2019年   24篇
  2018年   10篇
  2017年   32篇
  2016年   38篇
  2015年   40篇
  2014年   60篇
  2013年   84篇
  2012年   71篇
  2011年   82篇
  2010年   63篇
  2009年   69篇
  2008年   70篇
  2007年   70篇
  2006年   64篇
  2005年   65篇
  2004年   64篇
  2003年   40篇
  2002年   34篇
  2001年   38篇
  2000年   42篇
  1999年   29篇
  1998年   16篇
  1997年   14篇
  1996年   23篇
  1995年   7篇
  1994年   9篇
  1993年   10篇
  1992年   4篇
  1991年   10篇
  1990年   4篇
  1989年   3篇
  1988年   4篇
  1987年   4篇
  1986年   2篇
  1985年   6篇
  1984年   10篇
  1983年   5篇
  1982年   5篇
  1981年   3篇
  1980年   5篇
  1979年   4篇
  1976年   2篇
  1972年   1篇
排序方式: 共有1298条查询结果,搜索用时 390 毫秒
81.
82.
The different thermally induced intermolecular electron transfer (IET) processes that can take place in the series of complexes [M(Cat‐N‐BQ)(Cat‐N‐SQ)]/[M(Cat‐N‐BQ)2], for which M=Co ( 2 ), Fe ( 3 ) and Ni( 4 ), and Cat‐N‐BQ and Cat‐N‐SQ denote the mononegative (Cat‐N‐BQ?) or dinegative (Cat‐N‐SQ2?) radical forms of the tridentate Schiff‐base ligand 3,5‐di‐tert‐butyl‐1,2‐quinone‐1‐(2‐hydroxy‐3,5‐di‐tert‐butylphenyl)imine, have been studied by variable‐temperature UV/Vis and NMR spectroscopies. Depending on the metal ion, rather different behaviors are observed. Complex 2 has been found to be one of the few examples so far reported to exhibit the coexistence of two thermally induced electron transfer processes, ligand‐to‐metal (IETLM) and ligand‐to‐ligand (IETLL). IETLL was only found to take place in complex 3 , and no IET was observed for complex 4 . Such experimental studies have been combined with ab initio wavefunction‐based CASSCF/CASPT2 calculations. Such a strategy allows one to solicit selectively the speculated orbitals and to access the ground states and excited‐spin states, as well as charge‐transfer states giving additional information on the different IET processes.  相似文献   
83.
Fe-ZSM-5 分子筛催化剂上N2O一步氧化苯制苯酚的积炭动力学   总被引:2,自引:0,他引:2  
 采用等温固定床反应器和热重分析相结合的方法研究了 Fe-ZSM-5 分子筛上 N2O 一步氧化苯制苯酚的积炭行为, 考察了反应时间、温度和原料配比对积炭量的影响. 依据实验现象和积炭物组分分布的气相色谱-质谱分析结果, 提出了 Fe-ZSM-5 分子筛上 N2O 一步氧化苯制苯酚的积炭机理. 结果表明, Fe-ZSM-5 分子筛上的积炭物种主要来源于氧化产物苯酚的深度氧化, 属连串失活. 基于所提出的积炭机理和实验结果, 建立了 Fe-ZSM-5 分子筛催化剂的积炭动力学模型, 统计检验和残差分布检验表明, 所建模型与实验结果相容, 可靠性强.  相似文献   
84.
SUN  Hua-Yu ZHOU  Yan HUANG  Ya-Xi SUN  Wei MI  Jin-Xiao 《结构化学》2010,29(9):1387-1393
The hydroxy yttrium hexaborate,Y[B2O3(OH)]3,has been synthesized under mild hydrothermal conditions at 458 K.The crystal structure was solved and refined from single-crystal X-ray diffraction.It adopts a trigonal space group R3c(No.161) with a = 8.3942(4),c = 20.6484(12) ,V = 1260.03(12) 3,YB6H3O12,Mr = 348.79,Z = 6,Dc = 2.758 g/cm3,F(000) = 1008,μ = 7.015 mm-1,R = 0.0321 and wR = 0.0772.Its crystal structure is made up of six-membered rings,alternating three-connected [BO3(OH)] tetrahedra and planar [BO3] trigonal groups,which are interconnected with each other by sharing their common oxygen corners to form a three-dimensional framework structure with six-membered ring channels that are occupied by the yttrium atoms and run along the c axis.FT-IR,Raman,and TG-DTA results are also presented.  相似文献   
85.
合成了一种新型咪唑啉化合物1-(2-氨基-硫脲乙基)-2-十五烷基-咪唑啉(IM-S),并通过失重法、电化学方法及扫描电镜等研究了IM-S在H2S/CO2共存条件下对Q235钢的缓蚀性能,探讨了其在Q235钢表面的吸附行为.结果显示,IM-S具有较好的抗H2S、CO2腐蚀能力,能同时抑制碳钢腐蚀的阴、阳极反应过程,最高缓蚀效率可达92.74%.缓蚀剂在Q235钢表面呈单分子层吸附,属于以化学吸附为主的混合吸附.最后采用量子化学方法对IM-S的缓蚀机理做了进一步分析.  相似文献   
86.
刘霞  李伟  范小娜  糜志远 《光谱实验室》2011,28(5):2643-2645
建立高效液相色谱法测定普卢利沙星胶囊含量的方法。采用高效液相色谱法,以0.01mol.L-1盐酸溶液为溶剂,测定波长为280nm。在10—100μg.mL-1浓度范围内,主峰面积与相应的浓度呈良好的线性关系(r=0.9998)。重复测定峰面积平均值为1215.9(n=6),相对标准偏差为0.7%。平均回收率为99.77%(n=9),相对标准偏差为0.26%。该方法准确简便、重复性好,可作为普卢利沙星胶囊含量测定的有效方法。  相似文献   
87.
An optical technique for slope detection by using as storing medium a photorefractive BSO crystal is proposed. The technique relays in that a local tilt produced in a diffusing reflective surface can be mapped as a speckle transversal shifting in a plane perpendicular to the optical axis. The volume nature of the storing medium is quite adequate to highlight the speckle volume nature and its associated properties. Experimental results obtained by using a rubber vibrating membrane are presented.  相似文献   
88.
The optical phonon spectrum of the semiconductor Cu2SnTe3, that crystallizes in the orthorhombic structure with space group Imm2 (), have been studied by measuring unpolarized Raman scattering between 10 and 300 K. The experimental frequencies of the phonon modes observed were compared to those calculated by using simplified lattice dynamical models reported in the literature. From combined analysis of these results together with the factor group analysis of the zone-center vibrational modes, valuable information about these modes was obtained and their possible symmetry was assigned. A1 modes at 71, 123, 167, 176 and 190 cm−1; A2 modes 115 and 131 cm−1; B1 modes at 76, 142 and 152 cm−1; B2 modes at 89, 100 and 206 cm−1; a overtone at 246 cm−1, and combinations at 218, 270 and 292 cm−1; have been observed in this compound.  相似文献   
89.
米力阳  胡华 《数学杂志》2014,34(5):995-1004
本文在假定资本市场变动与保险公司资本收益变动存在相关性的情况下,研究了保险公司最优再保险策略问题.利用HJB-变分不等方程,获得了最优再保险策略和最小破产概率的显示表达式,推广了文献[3]的结果.  相似文献   
90.
In this work we consider a Transportation Location Routing Problem (TLRP) that can be seen as an extension of the two stage Location Routing Problem, in which the first stage corresponds to a transportation problem with truck capacity. Two objectives are considered in this research, reduction of distribution cost and balance of workloads for drivers in the routing stage. Here, we present a mathematical formulation for the bi-objective TLRP and propose a new representation for the TLRP based on priorities. This representation lets us manage the problem easily and reduces the computational effort, plus, it is suitable to be used with both local search based and evolutionary approaches. In order to demonstrate its efficiency, it was implemented in two metaheuristic solution algorithms based on the Scatter Tabu Search Procedure for Non-Linear Multiobjective Optimization (SSPMO) and on the Non-dominated Sorting Genetic Algorithm II (NSGA-II) strategies. Computational experiments showed efficient results in solution quality and computing time.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号