全文获取类型
收费全文 | 23680篇 |
免费 | 3091篇 |
国内免费 | 2230篇 |
专业分类
电工技术 | 2328篇 |
技术理论 | 5篇 |
综合类 | 3250篇 |
化学工业 | 1914篇 |
金属工艺 | 701篇 |
机械仪表 | 1090篇 |
建筑科学 | 1826篇 |
矿业工程 | 571篇 |
能源动力 | 625篇 |
轻工业 | 1576篇 |
水利工程 | 738篇 |
石油天然气 | 1642篇 |
武器工业 | 177篇 |
无线电 | 2704篇 |
一般工业技术 | 1871篇 |
冶金工业 | 494篇 |
原子能技术 | 221篇 |
自动化技术 | 7268篇 |
出版年
2024年 | 86篇 |
2023年 | 318篇 |
2022年 | 574篇 |
2021年 | 647篇 |
2020年 | 730篇 |
2019年 | 640篇 |
2018年 | 612篇 |
2017年 | 781篇 |
2016年 | 876篇 |
2015年 | 950篇 |
2014年 | 1351篇 |
2013年 | 1466篇 |
2012年 | 1713篇 |
2011年 | 1876篇 |
2010年 | 1437篇 |
2009年 | 1550篇 |
2008年 | 1589篇 |
2007年 | 1831篇 |
2006年 | 1595篇 |
2005年 | 1348篇 |
2004年 | 1215篇 |
2003年 | 926篇 |
2002年 | 815篇 |
2001年 | 670篇 |
2000年 | 529篇 |
1999年 | 477篇 |
1998年 | 376篇 |
1997年 | 288篇 |
1996年 | 285篇 |
1995年 | 268篇 |
1994年 | 242篇 |
1993年 | 180篇 |
1992年 | 146篇 |
1991年 | 99篇 |
1990年 | 82篇 |
1989年 | 81篇 |
1988年 | 36篇 |
1987年 | 35篇 |
1986年 | 30篇 |
1985年 | 46篇 |
1984年 | 28篇 |
1983年 | 24篇 |
1982年 | 27篇 |
1981年 | 19篇 |
1980年 | 18篇 |
1979年 | 17篇 |
1978年 | 12篇 |
1977年 | 16篇 |
1975年 | 8篇 |
1973年 | 5篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
《国际计算机数学杂志》2012,89(9):1413-1429
With the aid of computerized symbolic computation, we obtain new types of general solution of a first-order nonlinear ordinary differential equation with six degrees of freedom and devise a new generalized method and its algorithm, which can be used to construct more new exact solutions of general nonlinear differential equations. The (2+1)-dimensional K–D equation is chosen to illustrate our algorithm such that more families of new exact solutions are obtained, which contain non-travelling wave solutions and travelling wave solutions. 相似文献
992.
《国际计算机数学杂志》2012,89(7):1105-1117
A neural network ensemble is a learning paradigm in which a finite collection of neural networks is trained for the same task. Ensembles generally show better classification and generalization performance than a single neural network does. In this paper, a new feature selection method for a neural network ensemble is proposed for pattern classification. The proposed method selects an adequate feature subset for each constituent neural network of the ensemble using a genetic algorithm. Unlike the conventional feature selection method, each neural network is only allowed to have some (not all) of the considered features. The proposed method can therefore be applied to huge-scale feature classification problems. Experiments are performed with four databases to illustrate the performance of the proposed method. 相似文献
993.
994.
《国际计算机数学杂志》2012,89(3-4):271-286
This paper presents techniques for the numerical solution of partial differential equations using cubic spline collocation. The main spline relations are presented and incorporated into solution procedures for partial differential equations. The computational algorithm in every case is a tridiagonal matrix system amenable to efficient inversion methods. Truncation errors and stability are briefly discussed. Finally, some examples of their application to parabolic and hyperbolic systems with mixed boundary conditions are presented. The results obtained are encouraging and justify further research in this field. 相似文献
995.
《国际计算机数学杂志》2012,89(1-4):255-268
Parallel Breadth-First Search (BFS) algorithms for ordered trees and graphs on a shared memory model of a Single Instruction-stream Multiple Data-stream computer are proposed. The parallel BFS algorithm for trees computes the BFS rank of eachnode of an ordered tree consisting of n nodes in time of 0(β log n) when 0(n 1+1/β) processors are used, β being an integer greater than or equal to 2. The parallel BFS algorithm for graphs produces Breadth-First Spanning Trees (BFSTs) of a directedgraph G having n nodes in time 0(log d.log n) using 0(n 3) processors, where d is the diameter of G If G is a strongly connected graph or a connected undirected graph the BFS algorithm produces n BFSTs, each BFST having a different start node. 相似文献
996.
《国际计算机数学杂志》2012,89(3-4):149-153
The Aho-Corasick algorithm is a well-known method of determining the occurrences of one of several given pattern strings in a given text string. We address the question of augmenting the pattern matching machine constructed by this algorithm with a new pattern string, both on-line and off-line. We show that augmenting a machine of N nodes with a new pattern string of length m takes Θ(mN) time on-line and Θ(N) time off-line. 相似文献
997.
Design patterns codify proven solutions to recurring design problems. Their proper use within a development context requires that: (i) we understand them; (ii) we ascertain their applicability or relevance to the design problem at hand; and (iii) we apply them faithfully to the problem at hand. We argue that an explicit representation of the design problem solved by a design pattern is key to supporting the three tasks in an integrated fashion. We propose a model‐driven representation of design patterns consisting of triples < MP, MS, T > where MP is a model of the problem solved by the pattern, MS is a model of the solution proposed by the pattern, and T is a model transformation of an instance of the problem into an instance of the solution. Given an object‐oriented design model, we look for model fragments that match MP (call them instances of MP), and when one is found, we apply the transformation T yielding an instance of MS. Easier said than done. Experimentation with an Eclipse Modeling Framework‐based implementation of our approach applied to a number of open‐source software application's raised fundamental questions about: (i) the nature of design patterns in general, and the ones that lend themselves to our approach, and (ii) our understanding and codification of seemingly simple design patterns. In this paper, we present the principles behind our approach, report on the results of applying the approach to the Gang of Four (GoF) design patterns, and discuss the representability of design problems solved by these patterns. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
998.
《Behaviour & Information Technology》2012,31(6):537-548
Mining sequential patterns is to discover sequential purchasing behaviours for most of the customers from a large number of customer transactions. The strategy of mining sequential patterns focuses on discovering frequent sequences. A frequent sequence is an ordered list of the itemsets purchased by a sufficient number of customers. The previous approaches for mining sequential patterns need to repeatedly scan the database so that they take a large amount of computation time to find frequent sequences. The customer transactions will grow rapidly in a short time, and some of the customer transactions may be antiquated. Consequently, the frequent sequences may be changed due to the insertion of new customer transactions or the deletion of old customer transactions from the database. It may require rediscovering all the patterns by scanning the entire updated customer transaction database. In this paper, we propose an incremental updating technique to maintain the discovered sequential patterns when transactions are inserted into or deleted from the database. Our approach partitions the database into some segments and scans the database segment by segment. For each segment scan, our approach prunes those sequences that cannot be frequent sequences any more to accelerate the finding process of the frequent sequences. Therefore, the number of database scans can be significantly reduced by our approach. The experimental results show that our algorithms are more efficient than other algorithms for the maintenance of mining sequential patterns. 相似文献
999.
Nazanin SaadatAuthor Vitae Amir Masoud Rahmani Author Vitae 《Future Generation Computer Systems》2012,28(4):666-681
In recent years, grid technology has had such a fast growth that it has been used in many scientific experiments and research centers. A large number of storage elements and computational resources are combined to generate a grid which gives us shared access to extra computing power. In particular, data grid deals with data intensive applications and provides intensive resources across widely distributed communities. Data replication is an efficient way for distributing replicas among the data grids, making it possible to access similar data in different locations of the data grid. Replication reduces data access time and improves the performance of the system. In this paper, we propose a new dynamic data replication algorithm named PDDRA that optimizes the traditional algorithms. Our proposed algorithm is based on an assumption: members in a VO (Virtual Organization) have similar interests in files. Based on this assumption and also file access history, PDDRA predicts future needs of grid sites and pre-fetches a sequence of files to the requester grid site, so the next time that this site needs a file, it will be locally available. This will considerably reduce access latency, response time and bandwidth consumption. PDDRA consists of three phases: storing file access patterns, requesting a file and performing replication and pre-fetching and replacement. The algorithm was tested using a grid simulator, OptorSim developed by European Data Grid projects. The simulation results show that our proposed algorithm has better performance in comparison with other algorithms in terms of job execution time, effective network usage, total number of replications, hit ratio and percentage of storage filled. 相似文献
1000.
Fault prediction and the discriminative powers of connectivity-based object-oriented class cohesion metrics 总被引:1,自引:0,他引:1
Jehad Al Dallal 《Information and Software Technology》2012,54(4):396-416