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81.
研究了基于二维平行轮廓线的前列腺三维表现重建问题。采用Roberts边缘检测算子检测前列腺的边缘,提取其轮廓线。分析了BPL1算法在处理相信轮廓线无匹配部分时存在的缺陷。文章采用BPL1算法和相信轮廓线同步前进法相结合的方案被了前列腺表现的三维重建,给出了实验结果。实验表明重建的三维表面清晰、准确。 相似文献
82.
Wonjoon Cho Nicholas M Patrikalakis Jaime PeraireAuthor vitae 《Computer aided design》1998,30(14):1077-1087
This paper presents a method for constructing an auxiliary planar domain of triangulation for tessellating trimmed parametric surface patches. By minimizing a mapping error function, an approximate locally isometric mapping between a given trimmed parametric surface patch and its triangulation domain is constructed. In this way the shape of triangular elements on the triangulation domain is approximately preserved when mapped into three-dimensional space. We also provide an efficient method to achieve a good initial guess for the minimization of the mapping error function. Furthermore, our proposed method guarantees a homeomorphism between a triangulation domain and parametric space/given surface patch by robustly removing the possibility of self-intersection on the developed surface net. Practical application of the proposed algorithm can include the formation of ship hulls, ducts, shoes, clothing and automobile parts as well as the surface meshing procedure. 相似文献
83.
基于凹凸顶点判定的简单多边形的三角剖分 总被引:20,自引:1,他引:19
杨杰 《小型微型计算机系统》2000,21(9):974-975
本文提出了一种基于凹凸顶点判定的简单多边形的三角剖分,该算法首先计算简单多边形顶点的凹凸性,然后用环形追踪算法到一个三角剖分,最后通过局部变换得到一个较好的三角剖分。 相似文献
84.
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86.
Distributed Large-Volume Metrology (LVM) systems are mainly used for industrial applications concerning assembly and dimensional verification of large-sized objects. These systems generally consist of a set of network devices, distributed around the measurement volume, and some targets to be localized, in contact with the measured object's surface or mounted on a hand-held probe for measuring the points of interest. Target localization is carried out through several approaches, which use angular and/or distance measurements by network devices.This paper presents a new methodology to support the design of networks of devices, for distributed LVM systems based on triangulation (i.e., systems in which network devices perform angular measurements only). It is assumed that these systems use multi-sensor networks including two typologies of devices: some are accurate but expensive and other ones are less accurate but cheaper. The goal of the methodology is establishing a link between the following parameters: (i) density of network devices, (ii) mix between the two typologies of network devices, (iii) measurement uncertainty, and (iv) cost. The methodology allows to estimate the most appropriate density and mix between the two typologies of network devices, so that the distributed LVM system is conforming with the required measurement uncertainty and cost.The methodology relies on a large number of simulated experiments, defined and implemented using a dedicated routine; feasibility and practicality is tested by preliminary experiments on a multi-sensor photogrammetric system, developed at Politecnico di Torino—DIGEP. 相似文献
87.
Given a 3-vertex-connected triangular planar graph and an embedding of its boundary vertices, can the interior vertices be embedded to form a valid triangulation? We describe an algorithm which decides this problem and produces such an embedding if it exists. 相似文献
88.
火炮内膛形廓在线光电检测技术 总被引:7,自引:0,他引:7
文章介绍了在火炮身管内膛加工中,应用激光准直原理和光三角测径原理对火炮内膛直线度和形廓进行实时自动检测的光电技术和设备。该设备的测量误差小于0.005mm,实时检测结果可由计算机屏幕显示,并可由打印机记录输出。 相似文献
89.
Surface representations based on triangular grids 总被引:2,自引:0,他引:2
Leila De Floriani 《The Visual computer》1987,3(1):27-50
90.
Efficient triangulation of simple polygons 总被引:1,自引:0,他引:1
Godfried Toussaint 《The Visual computer》1991,7(5-6):280-295
This paper considers the topic of efficiently traingulating a simple polygon with emphasis on practical and easy-to-implement algorithms. It also describes a newadaptive algorithm for triangulating a simplen-sided polygon. The algorithm runs in timeO(n(1+t
o)) witht
0<n. The quantityt
0 measures theshape-complexity of thetriangulation delivered by the algorithm. More preciselyt
0 is the number of obtained triangles contained in the triangulation that share zero edges with the input polygon and is, furthermore, related to the shape-complexity of theinput polygon. Although the worst-case complexity of the algorithm isO(n
2), for several classes of polygons it runs in linear time. The practical advantages of the algorithm are that it is simple and does not require sorting or the use of balanced tree structures. On the theoretical side, it is of interest because it is the first polygon triangulation algorithm where thecomputational complexity is a function of theoutput complexity. As a side benefit, we introduce a new measure of the complexity of a polygon triangulation that should find application in other contexts as well. 相似文献