全文获取类型
收费全文 | 1100篇 |
免费 | 106篇 |
国内免费 | 59篇 |
专业分类
电工技术 | 19篇 |
综合类 | 46篇 |
化学工业 | 32篇 |
金属工艺 | 33篇 |
机械仪表 | 145篇 |
建筑科学 | 28篇 |
矿业工程 | 12篇 |
能源动力 | 10篇 |
轻工业 | 10篇 |
水利工程 | 1篇 |
石油天然气 | 2篇 |
武器工业 | 4篇 |
无线电 | 170篇 |
一般工业技术 | 73篇 |
冶金工业 | 13篇 |
原子能技术 | 12篇 |
自动化技术 | 655篇 |
出版年
2024年 | 1篇 |
2023年 | 7篇 |
2022年 | 6篇 |
2021年 | 15篇 |
2020年 | 29篇 |
2019年 | 22篇 |
2018年 | 12篇 |
2017年 | 18篇 |
2016年 | 26篇 |
2015年 | 38篇 |
2014年 | 64篇 |
2013年 | 42篇 |
2012年 | 83篇 |
2011年 | 116篇 |
2010年 | 87篇 |
2009年 | 108篇 |
2008年 | 88篇 |
2007年 | 71篇 |
2006年 | 83篇 |
2005年 | 52篇 |
2004年 | 64篇 |
2003年 | 48篇 |
2002年 | 32篇 |
2001年 | 32篇 |
2000年 | 18篇 |
1999年 | 25篇 |
1998年 | 18篇 |
1997年 | 17篇 |
1996年 | 10篇 |
1995年 | 6篇 |
1994年 | 2篇 |
1993年 | 9篇 |
1992年 | 4篇 |
1991年 | 7篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 3篇 |
排序方式: 共有1265条查询结果,搜索用时 15 毫秒
31.
Consistent segmentation of 3D models 总被引:2,自引:0,他引:2
This paper proposes a method to segment a set of models consistently. The method simultaneously segments models and creates correspondences between segments. First, a graph is constructed whose nodes represent the faces of every mesh, and whose edges connect adjacent faces within a mesh and corresponding faces in different meshes. Second, a consistent segmentation is created by clustering this graph, allowing for outlier segments that are not present in every mesh. The method is demonstrated for several classes of objects and used for two applications: symmetric segmentation and segmentation transfer. 相似文献
32.
In this paper, we present an extension of dynamic mesh compression techniques based on PCA. Such representation allows very compact representation of moving 3D surfaces; however, it requires some side information to be transmitted along with the main data. The biggest part of this information is the PCA basis, and since the data can be encoded very efficiently, the size of the basis cannot be neglected when considering the overall performance of a compression algorithm.
We present a new work in this area, as none of the papers about PCA based compression really addresses this issue. We will show that for an efficient and accurate encoding there are better choices than even sophisticated algorithms such as LPC.
We will present results showing that our approach can reduce the size of the basis by 90% with respect to direct encoding, which can lead to approximately 25% increase of performance of the compression algorithm without any significant loss of accuracy. Such improvement moves the performance of the PCA encoder beyond the performance of current state of the art dynamic mesh compression algorithms, such as the recently adopted MPEG standard, FAMC. 相似文献
We present a new work in this area, as none of the papers about PCA based compression really addresses this issue. We will show that for an efficient and accurate encoding there are better choices than even sophisticated algorithms such as LPC.
We will present results showing that our approach can reduce the size of the basis by 90% with respect to direct encoding, which can lead to approximately 25% increase of performance of the compression algorithm without any significant loss of accuracy. Such improvement moves the performance of the PCA encoder beyond the performance of current state of the art dynamic mesh compression algorithms, such as the recently adopted MPEG standard, FAMC. 相似文献
33.
A. J. Cuadros-Vargas M. Lizier R. Minghim L. G. Nonato 《Journal of Mathematical Imaging and Vision》2009,33(1):11-23
Techniques devoted to generating triangular meshes from intensity images either take as input a segmented image or generate
a mesh without distinguishing individual structures contained in the image. These facts may cause difficulties in using such
techniques in some applications, such as numerical simulations. In this work we reformulate a previously developed technique
for mesh generation from intensity images called Imesh. This reformulation makes Imesh more versatile due to an unified framework that allows an easy change of refinement metric, rendering it effective for constructing
meshes for applications with varied requirements, such as numerical simulation and image modeling. Furthermore, a deeper study
about the point insertion problem and the development of geometrical criterion for segmentation is also reported in this paper.
Meshes with theoretical guarantee of quality can also be obtained for each individual image structure as a post-processing
step, a characteristic not usually found in other methods. The tests demonstrate the flexibility and the effectiveness of
the approach.
相似文献
L. G. Nonato (Corresponding author)Email: |
34.
针对当前低速组播业务请求与光网络高速波长传输容量的问题,基于光网络组播业务疏导模型,提出动态组播业务疏导算法,将新的组播业务请求疏导到已建立的光组播树上,达到提高网络资源的利用率、降低组播业务连接阻塞概率的目的。仿真结果表明,该算法可有效地改善网络性能。 相似文献
35.
36.
37.
核磁共振成像MRI(Magnetic Resonance Imaging)是目前乳腺癌肿块诊断的常用辅助手段,对图像的正确解析是关键,针对传统MC(Marching Cubes)面绘制算法应用于乳腺MRI图像的不足,提出了改进方法。首先利用乳腺MRI序列图相邻帧间图像灰度分布的相似,肿块组织形状相近等相关性,在RSF(Region-Scalable Fitting)模型的基础上利用初始轮廓迭代的方法提取肿块区域。接着将多组参数下获得的结果,依据每一帧与其前后帧的重叠面积越大越好作为条件进行筛选,使提取的等值面最优化。最后采用基于加权二次误差度量的三角形折叠方法,对面绘制产生的大量三角网格进行了简化。将所提出的改进方法应用于30例乳腺MRI序列图,实验结果表明,对于乳腺MRI肿块的三维重建在精度和绘制速度上都比使用传统MC算法有很大提高。 相似文献
38.
39.
A multi-level cell by cell Adaptive Mesh Refinement (AMR) hydrodynamics capability has been developed for the Lagrangian step of the 2D Arbitrary Lagrangian Eulerian (ALE) code CORVUS. Connectivity arrays are used rather than a hierarchical data structure. We solve only on the dynamic unstructured mesh rather than on every level of a refinement hierarchy. The strength, artificial viscosity, slide and programmed burn methods have been generalised to work with AMR. Results are presented for a range of Lagrangian test problems. 相似文献
40.
We present a novel progressive painting‐based mesh cut out tool, called Paint Mesh Cutting, for interactive mesh segmentation. Different from the previous user interfaces, the user only needs to draw a single stroke on the foreground region and then obtains the desired cutting part at an interactive rate. Moreover, the user progressively paints the region of interest using a brush and has the instant feedback on cutting results as he/she drags the mouse. This is achieved by efficient local graph‐cut based optimizations based on the Gaussian mixture models (GMM) on the shape diameter function (SDF) metric of the shape. We demonstrate a number of various examples to illustrate the flexibility and applicability of our system and present a user study that supports the advantages of our user interface. 相似文献