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101.
Jeremy D. Jackson Anthony J. Yezzi Stefano Soatto 《International Journal of Computer Vision》2008,79(1):71-84
We propose a model of the shape, motion and appearance of a scene, seen through a sequence of images, that captures occlusions,
scene deformations, unconstrained viewpoint variations and changes in its radiance. This model is based on a collection of
overlapping layers that can move and deform, each supporting an intensity function that can change over time. We discuss the
generality and limitations of this model in relation to existing ones such as traditional optical flow or motion segmentation,
layers, deformable templates and deformotion. We then illustrate how this model can be used for inference of shape, motion,
deformation and appearance of the scene from a collection of images. The layering structure allows for automatic inpainting
of partially occluded regions. We illustrate the model on synthetic and real sequences where existing schemes fail, and show
how suitable choices of constants in the model yield existing schemes, from optical flow to motion segmentation and inpainting. 相似文献
102.
利用四次的Bézier曲线段构造了GC2连续的参数四次插值样条曲线,该样条曲线是保形的和局部的,且计算十分简单,所有的Bézier点由型值点和曲率直接计算产生,避免了求解矢量方程.最后,给出了一个数值实例. 相似文献
103.
多进程内存利用率自动监视分析技术的研究及实现 总被引:1,自引:0,他引:1
为了保证应用程序,特别是自动监控系统等需要长期运行的程序的可靠性、稳定性,提出了一种在软件产品生产测试阶段,能及时自动测试监控程序的内存及CPU负荷率等关键性能指标的方案,及其在某变电站监控系统测试中的实际应用。 相似文献
104.
105.
一种基于彩色图像分割的车牌检测方法 总被引:2,自引:0,他引:2
提出一种彩色图像车牌检测方法,主要包括三个步骤,首先对车牌图像执行多尺度区域生长分割,然后在分割结果中进行车牌区域的粗定位,最后对粗定位提取的车牌区域作精确定位分析.区域生长分割方法可以产生封闭的区域,容易提取其形状信息,而长矩形是车牌目标一个显著特征,因此可以通过形状信息检测车牌.在图像分割中,采取多尺度的分割方法,生成多个不同细节程度的分割结果.在每个分割图像中搜索具有车牌外形特征的图像区域,初步检测出候选车牌目标.根据车牌字符的大小和笔画特征,对候选车牌区域进行精确判别分析,得到最终的车牌检测结果.实验部分验证了车牌检测的有效性. 相似文献
106.
In this paper, we propose a novel method to achieve both dense 3D reconstruction of the scene and estimation of the camera intrinsic parameters by using coplanarities and other constraints (e.g., orthogonalities or parallelisms) derived from relations between planes in the scene and reflected curves of line lasers captured by a single camera. In our study, we categorize coplanarities in the scene into two types: implicit coplanarities, which can be observed as reflected curves of line lasers, and explicit coplanarities, which are, for example, observed as walls of a building. By using both types of coplanarities, we can construct simultaneous equations and can solve them up to four degrees of freedom. To upgrade the solution to the Euclidean space and estimate the camera intrinsic parameters, we can use metric constraints such as orthogonalities of the planes. Such metric constraints are given by, for example, observing the corners of rectangular boxes in the scene, or using special laser projecting device composed of two line lasers whose laser planes are configured to be perpendicular. 相似文献
107.
The design of systems for dynamic response may involve constraints that need to be satisfied over an entire time interval
or objective functions evaluated over the interval. Efficiently performing the constrained optimization is challenging, since
the typical response is implicitly linked to the design variables through a numerical integration of the governing differential
equations. Evaluating constraints is costly, as is the determination of sensitivities to variations in the design variables.
In this paper, we investigate the application of a temporal spectral element method to the optimization of transient and time-periodic
responses of fundamental engineering systems. Through the spectral discretization, the response is computed globally, thereby
enabling a more explicit connection between the response and design variables and facilitating the efficient computation of
response sensitivities. Furthermore, the response is captured in a higher order manner to increase analysis accuracy. Two
applications of the coupling of dynamic response optimization with the temporal spectral element method are demonstrated.
The first application, a one-degree-of-freedom, linear, impact absorber, is selected from the auto industry, and tests the
ability of the method to treat transient constraints over a large-time interval. The second application, a related mass-spring-damper
system, shows how the method can be used to obtain work and amplitude optimal time-periodic control force subject to constraints
over a periodic time interval.
This research was performed while the first author held a National Research Council Research Associateship Award at the Air
Force Research Laboratory.
An early version of this paper was presented at the 46th AIAA Aerospace Sciences Meeting and Exhibit, Jan 7–10, 2008, Reno,
Nevada. 相似文献
108.
Zhixue Wu 《Structural and Multidisciplinary Optimization》2009,37(6):625-634
The goal of this work is to obtain optimal hole shape for minimum stress concentration in two-dimensional finite plates using
parameterized geometry models. The boundary shape for a hole is described by two families of smooth curves: one is a “generalized
circular” function with powers as two parameters; the other one is a “generalized elliptic” function
a and b are ellipse axes) with powers as two parameters and one of the ellipse axes as the third parameter. Special attention is
devoted to the practicability of parameterized equations and the corresponding optimal results under the condition with and
without the curvature radius constraint. A number of cases were examined to test the effectiveness of the parameterized equations.
The numerical examples show that extremely good results can be obtained under the conditions with and without curvature radius
constraint, as compared to the known solutions in the literature. The geometries of the optimized holes are presented in a
form of compact parametric functions, which are suitable for use and test by designers. It is anticipated that the implementation
of the suggested parameterized equations would lead to considerable improvements in optimizing hole shape with high quality. 相似文献
109.
该文介绍变频器在型钢连轧机主传动系统中的应用。在我国,连轧中型钢材生产线屈指可数,轧机采用交流电动机的更是少之又少。交流电动机本身有着直流电动机所不具备的以下优点:没有电刷和换向器、结构简单、坚固耐用、经济可靠,不过因为其系一多变量、强耦合、非线性的时变系统,调速比较困难,随着电力电子技术的迅速发展和计算机控制技术以及现代控制理论的引人,交流调速系统才取得长足进步并得以广泛应用。 相似文献
110.