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   33697篇
  免费   3532篇
  国内免费   2113篇
电工技术   3334篇
技术理论   6篇
综合类   3491篇
化学工业   1111篇
金属工艺   683篇
机械仪表   2314篇
建筑科学   9984篇
矿业工程   577篇
能源动力   655篇
轻工业   497篇
水利工程   1074篇
石油天然气   597篇
武器工业   444篇
无线电   3376篇
一般工业技术   2167篇
冶金工业   692篇
原子能技术   118篇
自动化技术   8222篇
  2024年   134篇
  2023年   490篇
  2022年   863篇
  2021年   1055篇
  2020年   1141篇
  2019年   962篇
  2018年   860篇
  2017年   1119篇
  2016年   1247篇
  2015年   1454篇
  2014年   2517篇
  2013年   2802篇
  2012年   2235篇
  2011年   2520篇
  2010年   1958篇
  2009年   2104篇
  2008年   2013篇
  2007年   2309篇
  2006年   1985篇
  2005年   1682篇
  2004年   1324篇
  2003年   1140篇
  2002年   971篇
  2001年   880篇
  2000年   720篇
  1999年   564篇
  1998年   395篇
  1997年   344篇
  1996年   257篇
  1995年   262篇
  1994年   212篇
  1993年   156篇
  1992年   120篇
  1991年   107篇
  1990年   85篇
  1989年   62篇
  1988年   48篇
  1987年   42篇
  1986年   15篇
  1985年   45篇
  1984年   30篇
  1983年   33篇
  1982年   19篇
  1981年   9篇
  1980年   10篇
  1979年   9篇
  1976年   3篇
  1963年   4篇
  1962年   3篇
  1959年   5篇
排序方式: 共有10000条查询结果,搜索用时 625 毫秒
121.
In this paper the performance of a packet mobile radio network is studied inthe presence of shadow fading outage intervals.Under quite general assumptions for the medium access protocol,the probability mass function of the sequence of packets that may be lostdue to an outage interval is derived. It is seen that long sequences of lostpackets are likely to occur for typical values of the mobile speed andshadowing correlation parameters.For delay constrained sources, e.g., voice, the analysis is mainly focused atderiving the probability function of the sequence of dropped packetsand the probability of dropping. For data sources, the delay statistic isalso derived. In the latter case, the effect of finite buffer length isaddressed. Simulation is used to verify the accuracy of approximations introduced in the analysis.  相似文献   
122.
多目标模糊优选理论在水资源系统中的应用   总被引:2,自引:0,他引:2  
开放的水资源系统分析理论应是水资源学与系统科学等多种学科的结合 ,介绍一种新兴而实用的水资源系统分析技术———半结构性决策系统模糊优选理论的基本原理及其应用。  相似文献   
123.
价格不确定情况下炼厂生产计划的优化   总被引:4,自引:0,他引:4  
生产计划的编制是炼油企业生产经营管理中的一个关键环节,然而由于市场变化的不确定性,使企业制度长远规划受到限制,笔者将多目标规划应用于炼厂价格不确定情况下生产计划的制定,使所得到的生产计划在一定程度上反映市场的变化并能使企业的生产效益最优,为企业管理决策者进行长远规划给予指导。通过实例验证了该方法的可行性。  相似文献   
124.
Fusion of multi-sensor information is an important technology, which is growing exponentially due to its tremendous application potential in many areas. Effective fusion of data from sensors is very critical in increasing an intelligent system's capability to accomplish complex tasks. Appropriate fusion technologies are needed to be developed specially when a system requires redundant sensors to be used. More the redundancy in sensors, more is the computational complexity for controlling the system and more is its intelligence level. This research presents a strategy developed for multiple sensor fusion, based on geometric optimization. Each sensor's uncertainty has been modeled using classical Lagrangian optimization techniques. However, the uniqueness and effectiveness of the present technique lies on the fact that starting from the optimized value as initial estimate the accuracy of the sensory information has further been improved up to any pre defined bounded range, by developing two architectures – FFA (fission–fusion architecture) and FDD (fusion in differential domain). Sufficient evidences and analyses have been provided in the paper to show its effectiveness in various applications.  相似文献   
125.
Optimal Operation of Reservoir Systems using Simulated Annealing   总被引:5,自引:0,他引:5  
A stochastic search technique, simulated annealing (SA), is used to optimize the operation of multiple reservoirs. Seminal application of annealing technique in general to multi-period, multiple-reservoir systems, along with problem representation and selection of different parameter values used in the annealing algorithm for specific cases is discussed. The search technique is improved with the help of heuristic rules, problem-specific information and concepts from the field of evolutionary algorithms. The technique is tested for application to a benchmark problem of four-reservoir system previously solved using a linear programming formulation and its ability to replicate the global optimum solution is examined. The technique is also applied to a system of four hydropower generating reservoirs in Manitoba, Canada, to derive optimal operating rules. A limited version of this problem is solved using a mixed integer nonlinear programming and results are compared with those obtained using SA. A better objective function value is obtained using simulated annealing than the value from a mixed integer non-linear programming model developed for the same problem. Results obtained from these applications suggest that simulated annealing can be used for obtaining near-optimal solutions for multi-period reservoir operation problems that are computationally intractable.  相似文献   
126.
李国栋  陈维南 《机器人》1997,19(4):290-293
给出了一新的基于团队一致法的多传感器位置数据融合方法,该方法按传感器队中的每个成员的测量不确定性,构造团队期望效用函数(或密度),并基于该期望效用函数求得位置参数估计,其优点是可消除失效传感器和测量值为野值的传感器的影响,本文给出了仿真结果。  相似文献   
127.
提出采用具有附加线性约束的网络规划法,可把混联梯级水电站分解为几个子网络,简化了每个子网络的求解计算,从而加速大电网复杂的经济调度的计算速度。  相似文献   
128.
An investigation is made into the ways proof planning can enhance the capability of a rule based prover for the theory of integration. The integrals are of the Riemann type and are defined in a way to maximize the theorem proving methods of predicate calculus. Approximately fifty theorems have been proved and several examples are discussed. A major shortcoming was found to be the inability of the system to work with or produce a proof plan. As a result, a planning scheme based on the idea of subgoals or milestones was considered. With user defined plans, there was a substantial increase in performance and capability of the system and, in some cases, proofs which were previously unsuccessful were completed.  相似文献   
129.
Although the gas metal arc welding (GMAW) process is widely used for joining metals, its planning is still a cumbersome task. The planning procedure involves many complex interrelationships among the process variables and depends heavily on empirical knowledge. Therefore, a solution method that allows a convenient way to represent the domain knowledge and evaluate the process variable relationships is needed. Further, the lack of a strong domain theory to quantify these interrelationships is a deficiency in the planning of the GMAW process. This paper presents a solution method that overcomes this deficiency and introduces a convenient knowledge representation scheme. The solution method considers the planning procedure to be a constraint satisfaction problem (CSP). The AC-4 algorithm is used to obtain arc consistency among nodes in the constraint network and the PC-4 algorithm is applied to obtain path consistency in the network. A modified version of the AC-4 algorithm is developed to reduce the search space and correspondingly reduce the computation time. An example is presented to demonstrate the capability of the method and its potential to reduce lead time.  相似文献   
130.
施加复合电磁搅拌对A357合金微观组织的影响   总被引:3,自引:0,他引:3  
在半固态加工技术中,电磁搅拌是最早应用于制备非枝晶浆料的方法之一,同时也是半固态触变压铸技术最早获得工业应用的重要技术基础之一。采用自行开发的电磁搅拌器,研究了多种不同电磁搅拌方式在不同工艺条件下,单独施加或复合施加对A357合金微观组织的影响。试验结果表明:单一施加旋转感应电磁搅拌时,浆料径向组织很不均匀;单一施加无芯感应电磁搅拌。当搅拌电流较小时,径向组织也不均匀,增大电流,浆料质量有明显改善;采用(旋转感应+无芯感应)复合电磁场进行复合电磁搅拌时,可在电流较小时获得满意的浆料质量。  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