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   6864篇
  免费   1050篇
  国内免费   491篇
化学   1192篇
晶体学   19篇
力学   714篇
综合类   64篇
数学   803篇
物理学   5613篇
  2024年   6篇
  2023年   49篇
  2022年   128篇
  2021年   122篇
  2020年   130篇
  2019年   98篇
  2018年   113篇
  2017年   274篇
  2016年   286篇
  2015年   261篇
  2014年   462篇
  2013年   448篇
  2012年   420篇
  2011年   465篇
  2010年   355篇
  2009年   414篇
  2008年   496篇
  2007年   512篇
  2006年   415篇
  2005年   345篇
  2004年   337篇
  2003年   301篇
  2002年   251篇
  2001年   258篇
  2000年   218篇
  1999年   185篇
  1998年   177篇
  1997年   164篇
  1996年   126篇
  1995年   100篇
  1994年   73篇
  1993年   71篇
  1992年   50篇
  1991年   49篇
  1990年   43篇
  1989年   32篇
  1988年   30篇
  1987年   26篇
  1986年   12篇
  1985年   25篇
  1984年   20篇
  1983年   14篇
  1982年   14篇
  1981年   9篇
  1980年   3篇
  1979年   10篇
  1976年   2篇
  1975年   1篇
  1973年   2篇
  1957年   2篇
排序方式: 共有8405条查询结果,搜索用时 687 毫秒
111.
粘度法研究高分子溶液行为的实验改进(Ⅱ)   总被引:13,自引:0,他引:13  
高分子在粘度计毛细管管壁上的吸附不仅会导致毛细管有效管径减小,而且可以导致毛细管界面性质发生显著改变,具体表现为测定高分子溶液流过时间t之前和之后纯溶剂的流过时间t0和t0′与高分子溶液流过时间t对浓度作图外推到浓度为零时的值t0^*并不一致。不同温度时聚乙烯吡咯烷酮(PVP)水溶液粘度测定结果表明,当吸附讷发子显著改变了毛细管界面性质时,需要将高分子溶液粘度测定方法由t/t0′改为t/t0^*。经过改进的粘度测定方法不仅更加普适合理,而且更加简单有效。  相似文献   
112.
The dialysis potentials of different collodion membranes with graded pore sizes and electrochemical activities have been measured in dilute aqueous KCl solutions as functions of concentration. It is possible to predict the value of the diffusion potential within a few millivolts on the basis of electrical conductivity data obtained with the same membranes. In general, the measured values are lower than those calculated. It is assumed that this difference is caused by the membranes having a distribution of pore sizes.  相似文献   
113.
While operational qualification (OQ) is a well-established term within equipment qualification, users of equipment often become unsure when it comes to implementation. The biggest problem is how to select procedures and acceptance criteria. Should these be the vendor's specifications or should the users define their own limits, and, if so, how? Should all instruments of the same type have the same values or should these be optimized for each individual instrument? This article will provide an overall strategy and specific examples for HPLC on how to select procedures and acceptance limits that are based on efficient use of resources, on practicality and on the intended use of the equipment.  相似文献   
114.
J. U. Keller 《Adsorption》1995,1(4):283-290
The gas adsorbed on the inner surface of a highly porous material like activated carbon or zeolite can be measured by slow damped oscillations of a torsional pendulum. The physical principles and the theory of this method are outlined. Formulas are given relating the increase in mass due to adsorption to changes of the frequency and the logarithmic decrement of slow, damped rotational oscillations of the pendulum. Preliminary measurements of gas adsorption equilibria of nitrogen on activated carbon show that the ratio of the mass adsorbedm, to the mass of the adsorbentm s , can be determined by this method with mean absolute error |m/m s |0.04%.Dedicated to the memory of Joseph Kestin (1913–1993).  相似文献   
115.
116.
The viscosity of PEG-modified urethane acrylate (PMUA) showed peculiar behavior in the course of soap-free emulsification. Moreover, the viscosity change with added amounts of water was influenced by the reaction molar ratio of polyethylene glycol (PEG). The rate of increase in viscosity slowed and the ratio of increase in viscosity increased as the reaction molar ratio of PEG increased. This peculiar viscosity behavior was due to the microphase separation between hydrophilic and hydrophobic segments of PMUA, and the orientation of polyoxyethylene groups at O/W interface which influenced droplet size of the soap-free PMUA emulsion. The location of polyoxyethylene groups of this resin at O/W interface was confirmed using the adsorption isotherm measurement of PMUA molecules containing polyoxyethylene groups at water/benzene interface. The microphase separation behavior of PMUA between hydrophilic and hydrophobic segments could apply to the preparation of the PMUA gels containing peculiar structure. PMUA gels were prepared using dioxane (UAG) and the swelling behavior of these gels were compared to that of gels prepared using water (UAHG) in the same medium. In the same medium, the swelling behavior of UAHG gels differed from that of UAG gels because of the difference in the microstructure of gel due to the microphase separation between hydrophilic and hydrophobic segments. This phase separation in the course of gelation in water could be confirmed using contact angle measurement.  相似文献   
117.
最小一乘稳健多元分析校正   总被引:1,自引:3,他引:1  
王继红  谢玉珑 《分析化学》1994,22(3):255-260
本文论述最小一乘求解的多元分析校正算法,探讨了最小一乘较常规最小二乘法及其他隐健算法的优点。用计算机数值模拟及实际多组分光谱体系对方法进行了检验,展示了最小一乘法在分析化学计量学中实际应用的可行性。  相似文献   
118.
对近期发展的固体圆二色(CD)光谱测试方法进行了概述、评价和比较, 着重探讨了“浓度效应”的存在使固体CD光谱失真的原因. 通过对本课题组和其他作者已报道的四种化合物的固体CD谱再测试的反思, 强调了依手性化合物的手性光谱学性质不同, 根据浓度梯度实验选择其合适测试浓度的必要性. 对固有手性的阻转异构化合物(S)-1,1'-联二萘酚(S-BINOL)进行了成膜法固体CD谱浓度梯度测试, 发现所得固体薄膜CD谱中也存在着“浓度效应”  相似文献   
119.
A review is given on the main problems associated with the determination and interpretation of molecular diffusion in zeolites. It is shown that the diffusivities may most decisively depend on the relevant space and time scales of observation, as well as on the physical state under which the measurements are carried out. Special emphasis is given to the microscopic techniques and their most recent evidence on the existence of transport resistances distributed over the intracrystalline space.  相似文献   
120.
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