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   1148篇
  免费   179篇
  国内免费   91篇
化学   492篇
晶体学   30篇
力学   164篇
综合类   9篇
数学   45篇
物理学   678篇
  2024年   2篇
  2023年   11篇
  2022年   24篇
  2021年   46篇
  2020年   41篇
  2019年   25篇
  2018年   35篇
  2017年   30篇
  2016年   41篇
  2015年   37篇
  2014年   51篇
  2013年   82篇
  2012年   52篇
  2011年   81篇
  2010年   63篇
  2009年   74篇
  2008年   91篇
  2007年   94篇
  2006年   76篇
  2005年   76篇
  2004年   69篇
  2003年   36篇
  2002年   40篇
  2001年   26篇
  2000年   31篇
  1999年   26篇
  1998年   25篇
  1997年   20篇
  1996年   21篇
  1995年   14篇
  1994年   6篇
  1993年   10篇
  1992年   11篇
  1991年   8篇
  1990年   5篇
  1989年   4篇
  1988年   6篇
  1987年   3篇
  1986年   4篇
  1985年   4篇
  1984年   5篇
  1983年   1篇
  1982年   2篇
  1981年   3篇
  1980年   2篇
  1979年   2篇
  1974年   2篇
排序方式: 共有1418条查询结果,搜索用时 15 毫秒
1.
《Mendeleev Communications》2022,32(5):597-600
Calorimetric monitoring of the autoclave reaction N2O4 + C2H4 at –85 to +10 °C under argon pressure 10–30 bar revealed that the exothermic chemical reaction started at temperatures above –52 °C at 10 bar, whereas an intensive exothermic reaction started at –85 °C and pressure of 30 bar. IR study showed that oligo/polynitroethylene was formed at 30 bar, while carbonyl and hydroxy compound as well as nitrate R–ONO2 formation occurred upon processing at 10 bar.  相似文献   
2.
The Pd‐catalyzed polycondensation of 4‐octylaniline with various dibromoarylenes was carried out under microwave heating. Microwave heating led to a decrease in the reaction time and an increase in the molecular weight of the polymers as compared to conventional heating. Microwave heating also allowed the catalyst loading to be reduced to 1 mol %, yielding polymerization results that were comparable to those under conventional heating and 5 mol % catalyst. Investigations regarding field‐effect transistors and organic photovoltaic cells using the obtained poly(arylamine) with azobenzene units revealed that increasing the molecular weight of the polymer led to improved device performance, including hole mobility and power conversion efficiency. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015 , 53, 536–542  相似文献   
3.
Activated carbon production from almond shells using phosphoric acid activation agent was achieved by applying both conventional heating and microwave heating in succession. The morphology and surface properties of activated carbon were studied using thermogravimetric and differential gravimetric analysis, Fourier-transform infrared spectroscopy, scanning electron microscopy, and Brunauer–Emmett–Teller analysis. A surface area of 1128 m2/g was achieved by optimizing the microwave power (500?W), microwave application time (15?minutes), conventional heating time (45?minutes), conventional heating temperature (500?°C), and the phosphoric acid:sample ratio (0.7:1). An adsorption capacity of methylene blue of 148?mg/g and an iodine value of 791?mg/g was obtained for the prepared activated carbon.  相似文献   
4.
A novel and direct method for the synthesis of α-halocarbonyl compounds using sequential treatment of carbonyl compounds with [hydroxy(tosyloxy)iodo]benzene followed by magnesium halides under solvent-free microwave irradiation conditions is described.  相似文献   
5.
Experimental and numerical calculation results devoted to development of an optical system for an ion source based on a repetition rate CO2 laser are described. The laser chain consists of a master oscillator, gas absorber cells, and a four-pass amplifier. The optical system provides smooth laser pulses with variable duration and high spatial quality that ensures efficiency for plasma heating and ion generation. The parameters of the plasma ion component measured in the CERN laboratory are applied for a lead target illumination.  相似文献   
6.
一种微型空调器的优化设计   总被引:1,自引:1,他引:0  
介绍了一种微型空调器的研制背景及设计方案 ,采用仿真优化的设计手段对空调器的制冷、制热系统进行了优化设计 ,实践证明其设计是成功的。同时说明了该型空调器所具有的特点及应用场合  相似文献   
7.
本文介绍一种直接测量散热率新方法.进而测出不良导体的热系数。该方法,减小了由间接测量散热率所带来的误差,实验装置简单,操作方便,参数少,测量结果的精确性和重复性都有较大提高,更重要的是这一新的实验方法突出了物理思想。  相似文献   
8.
A model for the flow of a fluid through a channel with parallel plates is investigated. The channel is narrow, so that the lubrication approximation may be applied. The channel walls are maintained at a constant temperature. Shear heating effects are included and the fluid viscosity decreases exponentially with temperature. When the flow is driven solely by shear stress or imposed velocity at the top, analytical progress is possible. When pressure gradient also drives the flow the problem is solved numerically.  相似文献   
9.
Laser gas-assisted material processing finds wide application in industry. The modelling of heating, elastic response of the substrate material, and the wave analysis gives insight into the laser workpiece interaction. In the present study, laser gas-assisted heating of steel is considered. The normal component of the thermal stress is taken as the source of load for the flexural wave generation in the material. The flexural wave generated is simulated and the wave characteristics are analyzed at four locations at the workpiece surface. The numerical scheme employing a control volume approach is introduced when solving the governing equations of flow and heat transfer while finite element and spectran element methods are used when solving the stress and wave equations. It is found that the normal component of the stress is tensile. The dispersion effect of the workpiece material, interference of the reflected beam, and partial overlapping of second mode of the travelling wave enable to identify a unique pattern in the travelling wave in the substrate.  相似文献   
10.
 用数值模拟方法研究利用辐射加热来产生均匀等离子体状态,它可被用来测量元素的辐射不透明度,校验辐射不透明度理论。研究了在辐射加热铁的“三明治”型靶时影响生成均匀等离子体状态的几个重要因素(样品厚度、CH膜厚度和辐射源)所起的作用,研究发现,当铁等离子体通过热传导达到均匀状态时,其尺度必须与此时的传热距离相当,从而定出铁样品的厚度;低Z介质CH膜对铁等离子体有明显的箍束作用,调整CH膜的厚度可以调节所产生的等离子体状态;调整不同方向上的CH膜厚度,可以控制铁等离子体的膨胀方向,使它尽可能地达到一维膨胀,使得反推出的等离子体密度可以更加准确;样品的种类、厚度以及外面的低Z介质厚度决定了在某时刻能获得的等离子体状态,以及为产生此等离子体状态所需的最低辐射能。  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