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   1127篇
  免费   88篇
  国内免费   43篇
电工技术   38篇
综合类   200篇
化学工业   91篇
金属工艺   13篇
机械仪表   43篇
建筑科学   38篇
矿业工程   15篇
能源动力   34篇
轻工业   43篇
水利工程   15篇
石油天然气   4篇
武器工业   11篇
无线电   108篇
一般工业技术   95篇
冶金工业   33篇
原子能技术   17篇
自动化技术   460篇
  2024年   2篇
  2023年   6篇
  2022年   15篇
  2021年   10篇
  2020年   20篇
  2019年   33篇
  2018年   31篇
  2017年   29篇
  2016年   25篇
  2015年   47篇
  2014年   51篇
  2013年   78篇
  2012年   71篇
  2011年   79篇
  2010年   56篇
  2009年   66篇
  2008年   136篇
  2007年   76篇
  2006年   50篇
  2005年   38篇
  2004年   40篇
  2003年   35篇
  2002年   28篇
  2001年   26篇
  2000年   24篇
  1999年   21篇
  1998年   21篇
  1997年   15篇
  1996年   15篇
  1995年   16篇
  1994年   14篇
  1993年   5篇
  1992年   8篇
  1991年   14篇
  1990年   9篇
  1989年   9篇
  1988年   10篇
  1987年   2篇
  1985年   4篇
  1984年   3篇
  1982年   2篇
  1980年   3篇
  1979年   2篇
  1978年   2篇
  1966年   1篇
  1965年   1篇
  1963年   1篇
  1961年   1篇
  1959年   1篇
  1954年   1篇
排序方式: 共有1258条查询结果,搜索用时 0 毫秒
1.
2.
本文的主要目的是利用初等方法研究Smarandache可乘函数在简单数集中的均值性质,并给出一个有趣的渐近公式。  相似文献   
3.
号码是一种有限的资源,虽然企业专网的号码资源比较丰富,但也不能毫无规律随意编制,否则会为将来发展带来意想不到的麻烦,本文叙述了号码编制必须遵循的一些原则,希望对专网的管理人员有一些帮助。  相似文献   
4.
An approach to solving a linear interpolation problem in a fuzzy information space is proposed. Two different schemes of interpolation are outlined: a heuristic one, based on the geometrical interpretation of operations, and an optimization one, based on the expansion principle. The results obtained allow performing fuzzy linear prediction. __________ Translated from Kibernetika i Sistemnyi Analiz, No. 2, pp. 55–68, March–April 2006.  相似文献   
5.
In this paper we have introduced a class of decision rules related to simple majority, by considering individual intensities of preference. These intensities will be shown by means of linguistic labels. In order to compare the amount of opinion obtained by each alternative, we have considered the total ordered monoid generated by the sums of the original labels, according to an addition and an ordering. In this general framework different sets of linguistic labels can be employed and these sets can be represented by means of diverse mathematical objects. Moreover, on these mathematical representations of linguistic labels several orderings can be considered. Thus, flexibility is an important feature of this new class of group decision making procedures. Some examples of putting in practice the simple majority decision rules based on linguistic labels are provided, and the main properties of these voting systems are analyzed. It is worth emphasizing that these properties are satisfied for any total ordered monoid, regardless of the mathematical representation of linguistic labels or the ordering used to compare collective opinions.  相似文献   
6.
In this paper, we present the induced generalized intuitionistic fuzzy ordered weighted averaging (I-GIFOWA) operator. It is a new aggregation operator that generalized the IFOWA operator, including all the characteristics of both the generalized IFOWA and the induced IFOWA operators. It provides a very general formulation that includes as special cases a wide range of aggregation operators for intuitionistic fuzzy information, including all the particular cases of the I-IFOWA operator, GIFOWA operator and the induced intuitionistic fuzzy ordered geometric (I-IFOWG) operator. We also present the induced generalized interval-valued intuitionistic fuzzy ordered weighted averaging (I-GIIFOWA) operator to accommodate the environment in which the given arguments are interval-valued intuitionistic fuzzy sets. Further, we develop procedures to apply them to solve group multiple attribute decision making problems with intuitionistic fuzzy or interval-valued intuitionistic fuzzy information. Finally, we present their application to show the effectiveness of the developed methods.  相似文献   
7.
文章结合HARDINGE数控车床实例,介绍了如何利用FANUC18T数控系统中提供的计数器跟踪刀具加工的次数,通过新增一个刀具寿命管理功能模块的PMC子程序,为用户提供一个友好、可视、便捷的刀具寿命管理功能。对今后类似的设备功能设计和改进都具有实际的指导意义和参考价值。  相似文献   
8.
本文通过许多实例,指出了氧化还原反应式配平中可能出现的得失电子数不等或电荷数未配平、得失电子关系不对及反应式中酸碱性介质有错误等几种差错,并归纳了在酸碱性水溶液中平衡介质的方法。  相似文献   
9.
纸币成像方式分为反射和透射成像两种方式。反射方式成像的纸币图像清晰、背景单一,但采集任意方向进入点验设备的冠字号图像需两个图像传感器,占用仓室空间大;相同条件下,透射方式仅需一个图像传感器,具有空间上的优势,但透射方式的图像背景复杂、两面图像重叠、易光照不均。针对这些问题,提出一种冠字号定位的新算法。检测冠字号的字符间间隙特征点;在特征点检测基础上,进行水平投影,根据人民币固有属性计算冠字号区域的准确水平位置;在水平定位基础上,通过定位欧姆龙环间接计算出冠字号区域的准确垂直位置;利用连通域标记算法定位出单个字符。对2000张正常流通05版人民币进行测试,定位正确率为100%。  相似文献   
10.
Ionic liquids as electrolytes   总被引:5,自引:0,他引:5  
Salts having a low melting point are liquid at room temperature, or even below, and form a new class of liquids usually called room temperature ionic liquids (RTIL). Information about RTILs can be found in the literature with such key words as: room temperature molten salt, low-temperature molten salt, ambient-temperature molten salt, liquid organic salt or simply ionic liquid. Their physicochemical properties are the same as high temperature ionic liquids, but the practical aspects of their maintenance or handling are different enough to merit a distinction. The class of ionic liquids, based on tetraalkylammonium cation and chloroaluminate anion, has been extensively studied since late 1970s of the XX century, following the works of Osteryoung. Systematic research on the application of chloroaluminate ionic liquids as solvents was performed in 1980s. However, ionic liquids based on aluminium halides are moisture sensitive. During the last decade an increasing number of new ionic liquids have been prepared and used as solvents. The general aim of this paper was to review the physical and chemical properties of RTILs from the point of view of their possible application as electrolytes in electrochemical processes and devices. The following points are discussed: melting and freezing, conductivity, viscosity, temperature dependence of conductivity, transport and transference numbers, electrochemical stability, possible application in aluminium electroplating, lithium batteries and in electrochemical capacitors.  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