全文获取类型
收费全文 | 57661篇 |
免费 | 7430篇 |
国内免费 | 5324篇 |
专业分类
电工技术 | 6088篇 |
技术理论 | 1篇 |
综合类 | 7660篇 |
化学工业 | 4036篇 |
金属工艺 | 2237篇 |
机械仪表 | 5441篇 |
建筑科学 | 5713篇 |
矿业工程 | 1992篇 |
能源动力 | 1711篇 |
轻工业 | 1030篇 |
水利工程 | 1954篇 |
石油天然气 | 1546篇 |
武器工业 | 1082篇 |
无线电 | 4500篇 |
一般工业技术 | 6014篇 |
冶金工业 | 1218篇 |
原子能技术 | 250篇 |
自动化技术 | 17942篇 |
出版年
2024年 | 224篇 |
2023年 | 836篇 |
2022年 | 1469篇 |
2021年 | 1669篇 |
2020年 | 1877篇 |
2019年 | 1626篇 |
2018年 | 1573篇 |
2017年 | 2020篇 |
2016年 | 2356篇 |
2015年 | 2490篇 |
2014年 | 3494篇 |
2013年 | 3838篇 |
2012年 | 4409篇 |
2011年 | 4379篇 |
2010年 | 3483篇 |
2009年 | 3594篇 |
2008年 | 3592篇 |
2007年 | 4202篇 |
2006年 | 3657篇 |
2005年 | 3053篇 |
2004年 | 2486篇 |
2003年 | 2116篇 |
2002年 | 1804篇 |
2001年 | 1602篇 |
2000年 | 1439篇 |
1999年 | 1164篇 |
1998年 | 941篇 |
1997年 | 864篇 |
1996年 | 717篇 |
1995年 | 620篇 |
1994年 | 545篇 |
1993年 | 420篇 |
1992年 | 355篇 |
1991年 | 287篇 |
1990年 | 220篇 |
1989年 | 220篇 |
1988年 | 160篇 |
1987年 | 88篇 |
1986年 | 72篇 |
1985年 | 61篇 |
1984年 | 81篇 |
1983年 | 47篇 |
1982年 | 52篇 |
1981年 | 29篇 |
1980年 | 40篇 |
1979年 | 45篇 |
1978年 | 15篇 |
1977年 | 23篇 |
1976年 | 14篇 |
1975年 | 12篇 |
排序方式: 共有10000条查询结果,搜索用时 768 毫秒
1.
随着海洋资源勘探和海洋污染物监控工作的开展,水文数据的监测和采集等已经成为重要的研究方向。其中,水下无线传感器网络在水文数据采集过程中起着举足轻重的作用。本文研究的是水下无线传感器二维监测网络模型中,传感器节点数据采集的问题,其设计方法是通过自组织映射(Self-organizing mapping,SOM)对传感器节点进行路径最优化处理,结合优化的路径图形和K-means算法找到路径内部聚合点,利用聚合点和传感器的节点得到传感器通信半径内的数据采集点,最后通过SOM得到水下机器人(Autonomous underwater vehicle,AUV)到各个数据采集点采集数据的最优路径。经过实验验证,在水下1 200 m × 1 750 ![]()
![]()
m范围内布置52个传感器节点的情景下,数据采集点相比于传感器节点路径规划采用相同的采集顺序得到的路径优化了6.7%;对数据采集点重新进行自组织路径规划得到的路径比传感器结点路径的最优解提高了12.2%。增加传感器节点的数量,其结果也大致相同,因此采用该方法可以提高水下机器人采集数据的效率。 相似文献
2.
《岩石力学与岩土工程学报(英文版)》2022,14(5):1421-1432
Prediction of mode I fracture toughness (KIC) of rock is of significant importance in rock engineering analyses. In this study, linear multiple regression (LMR) and gene expression programming (GEP) methods were used to provide a reliable relationship to determine mode I fracture toughness of rock. The presented model was developed based on 60 datasets taken from the previous literature. To predict fracture parameters, three mechanical parameters of rock mass including uniaxial compressive strength (UCS), Brazilian tensile strength (BTS), and elastic modulus (E) have been selected as the input parameters. A cluster of data was collected and divided into two random groups of training and testing datasets. Then, different statistical linear and artificial intelligence based nonlinear analyses were conducted on the training data to provide a reliable prediction model of KIC. These two predictive methods were then evaluated based on the testing data. To evaluate the efficiency of the proposed models for predicting the mode I fracture toughness of rock, various statistical indices including coefficient of determination (R2), root mean square error (RMSE), and mean absolute error (MAE) were utilized herein. In the case of testing datasets, the values of R2, RMSE, and MAE for the GEP model were 0.87, 0.188, and 0.156, respectively, while they were 0.74, 0.473, and 0.223, respectively, for the LMR model. The results indicated that the selected GEP model delivered superior performance with a higher R2 value and lower errors. 相似文献
3.
4.
5.
We present a framework for the formulation of MIP scheduling models based on multiple and nonuniform discrete time grids. In a previous work we showed that it is possible to use different (possibly non-uniform) time grids for each task, unit, and material. Here, we generalize these ideas to account for general resources, and a range of processing characteristics such as limited intermediate storage and changeovers. Each resource has its own grid based on resource consumption and availability allowing resource constraints to be modeled more accurately without increasing the number of binary variables. We develop algorithms to define the unit-, task-, material-, and resource-specific grids directly from problem data. Importantly, we prove that the multi-grid formulation is able to find a schedule with the same optimal objective as the discrete-time single-grid model with an arbitrarily fine grid. The proposed framework leads to the formulation of models with reduced number of binary variables and constraints, which are able to find good solutions faster than existing models. 相似文献
6.
本文以喷淋液滴在空气环境下运动特性为工程背景,建立单个液滴在常温、常压空气环境中的动量方程,分析液滴沉降特性、追赶特性及运动轨迹行为。计算结果表明,不同喷淋液滴初始条件下,短时间内存在重力大于曳力和重力小于曳力两种情况,但最终减速液滴均会达到受力平衡状态;液滴离开喷淋头后,垂向位移均迅速增大,液滴粒径越大、初始速度越大,垂向位移增长的速率也越大,达到相同位移的用时越短;液滴尺寸、初始速度相差越大,液滴追赶所用的时间越短,追赶位移越小,液滴尺寸、初始速度越接近,液滴追赶所用的时间越长,追赶位移越大;液滴初始速度越大、初始直径越大、喷射角度越大,横向速度消失越慢,达到的横向位移越大,喷射液滴覆盖的面积也越大。计算结果有助于优化工程实际中喷淋系统的设计与布置。 相似文献
7.
某出口型号交流电力机车牵引控制系统要求变流器控制逻辑具备接触器控制、牵引系统数据交互、变流器故障保护、变流器启动自检等功能。针对以上功能,基于MATLAB中的Simulink/Stateflow可视化编程工具进行牵引控制模型的搭建,遵循模块化编程理念,采用较少的程序代码编写实现复杂的逻辑控制模型,生成逻辑清晰的控制功能流程图,进行半实物仿真测试,增强控制模型的可靠性。通过该变流器产品型式试验检验,验证变流器控制逻辑的功能可以满足控制系统的需求。 相似文献
8.
In this paper, novel computing approach using three different models of feed-forward artificial neural networks (ANNs) are presented for the solution of initial value problem (IVP) based on first Painlevé equation. These mathematical models of ANNs are developed in an unsupervised manner with capability to satisfy the initial conditions exactly using log-sigmoid, radial basis and tan-sigmoid transfer functions in hidden layers to approximate the solution of the problem. The training of design parameters in each model is performed with sequential quadratic programming technique. The accuracy, convergence and effectiveness of the proposed schemes are evaluated on the basis of the results of statistical analyses through sufficient large number of independent runs with different number of neurons in each model as well. The comparisons of these results of proposed schemes with standard numerical and analytical solutions validate the correctness of the design models. 相似文献
9.
Distribution systems are most commonly operated in a radial configuration for a number of reasons. In order to impose radiality constraint in the optimal network reconfiguration problem, an efficient algorithm is introduced in this paper based on graph theory. The paper shows that the normally followed methods of imposing radiality constraint within a mixed-integer programming formulation of the reconfiguration problem may not be sufficient. The minimum-loss network reconfiguration problem is formulated using different ways to impose radiality constraint. It is shown, through simulations, that the formulated problem using the proposed method for representing radiality constraint can be solved more efficiently, as opposed to the previously proposed formulations. This results in up to 30% reduction in CPU time for the test systems used in this study. 相似文献
10.
In this paper, the dynamic behaviors on the basis of simulation for high-purity heat integrated air separation column (HIASC) are studied. A nonlinear generic model control (GMC) scheme is proposed based on the nonlinear behavior analyses of a HIASC process, and an adaptive generic model control (AGMC) scheme is further presented to correct the model parameters online. Related internal model control (IMC) scheme and multi-loop PID (M-PID) scheme are also developed as the comparative base. The comparative researches are carried out among these linear and nonlinear control schemes in detail. The simulation research results show that the proposed AGMC schemes present advantages in both servo control and regulatory control for the high-purity HIASC. 相似文献