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排序方式: 共有290条查询结果,搜索用时 109 毫秒
91.
基于启发式搜索分离向量的凸多面体碰撞检测 总被引:7,自引:0,他引:7
碰撞检测是计算机模拟物理过程的基础,在计算机图形学、CAD/CAM、虚拟现实和机器人等领域有着广泛的应用.该文给出了一个新的用于凸多面体碰撞检测的算法——HP-jump.HP-jump建立了一个有效的碰撞检测模型用于报告物体的碰撞,同时提供了一个快速的启发式的策略用于搜索两个凸多面体的分离向量.该算法是利用凸多面体的层次表示来搜索支撑顶点对,用平衡二叉树来记录球面凸多边形的顶点,同时还利用了时间、空间相关性,这些都加速了算法的执行.该文的最后给出了HP-jump与GJK,I-COLLIDE算法的比较. 相似文献
92.
Dunning TH Schulten K Tromp J Ostriker JP Droegemeier K Xue M Fussell P 《Computing in science & engineering》2009,11(5):28-37
What breakthrough advances will petascale computing bring to various science and engineering fields? Experts in everything from astronomy to seismology envision the opportunities ahead and the impact they'll have on advancing our understanding of the world. 相似文献
93.
SJ Peter MJ Yaszemski LJ Suggs RG Payne R Langer WC Hayes MR Unroe LB Alemany PS Engel AG Mikos 《Canadian Metallurgical Quarterly》1997,8(11):893-904
Neointimal formation and arterial wall remodeling are pivotal causes of luminal narrowing in atherogenesis and restenosis. Arterial remodeling refers to a series of dynamic structural changes that arteries may undergo in response to various stimuli, including changes in blood flow and pressure, and acute injury. The biological mechanisms involved in arterial remodeling are poorly understood and are currently a main target for research. We have recently focused on the role of the arterial wall microcirculation (ie, vasa vasorum) in arterial remodeling after injury. In the past, a correlation between arterial wall neovascularization and the accumulation of arterial plaque has been documented; however, the dynamic role of these microvessels in arterial repair and luminal narrowing has not been examined. The type of arterial injury, the nature of the lesion that develops, and the arterial compartment in which angiogenesis occurs may determine the role of the vasa vasorum in arterial narrowing. In this review, we highlight the data that link arterial wall neovascularization with lesion formation and the process of arterial remodeling. 相似文献
94.
Peter Shirley Kelvin Sung Erik Brunvand Alan Davis Steven Parker Solomon Boulos 《Computers & Graphics》2008,32(2):260-267
The modern graphics processing units (GPUs), found on almost every personal computer, use the z-buffer algorithm to compute visibility. Ray tracing, an alternative to the z-buffer algorithm, delivers higher visual quality than the z-buffer algorithm but has historically been too slow for interactive use. However, ray tracing has benefited from improvements in computer hardware, and many believe it will replace the z-buffer algorithm as the graphics engine on PCs. If this replacement happens, it will imply fundamental changes in both the API to and capabilities of 3D graphics engines. This paper overviews the backgrounds in z-buffer and ray tracing, presents our case that ray tracing will replace z-buffer in the near future, and discusses the implications for graphics oriented classes should this switch to ray tracing occur. Since computer gaming is one of the most important industry driving graphics hardware and the fact that recently there are many computer science courses related to games and games development, we also describe the potential impact on games related classes. 相似文献
95.
L Johnson GU Falk LC Suggs DJ Henderson GE Spoede SW Brown TA McGowen H Meguerditchian JJ Barnard 《Canadian Metallurgical Quarterly》1997,25(7-8):549-555
A novel animal model (syngeneic neonatal testicular graft transplanted under the skin of the outer ear in adult inbred Fischer rats that had been castrated, hypophysectomised, and/or subjected to hormonal replacement therapy) was developed to study regulation of spermatogenesis and Sertoli cell number. Given that Sertoli cell number and testicular size are important in determining spermatozoan production rates, this model was first used to study Sertoli cell proliferation, testicular size, and establishment of germ cells. The specific objectives were to determine the developmental pattern of Sertoli cell numbers in transplanted testes and the effect of number of testes transplanted, sex of hosts, pituitary hormonal removal, and replacement on Sertoli cell number, hormonal status of the host, and establishment of germ cells. A few tubules had complete spermatogenesis at 90 days posttransplantation, indicating that Sertoli cells in some of these tubules were functional. Leydig cell structure appeared to be normal, but the density of these interstitial cells was greater than that in testes of intact rats. Although the weight of the seminal vesicles and prostate were maintained in the castrated host with transplants, both serum FSH and LH concentrations were higher than intact control rats. Leukocytic infiltration of testes was not observed in intact rats or in rats receiving neonatal testes. Although transplanted testes showed a delay in reaching the plateau value for Sertoli cell number per testis and although the value reached was lower than in intact testes, the developmental pattern of Sertoli cell proliferation (early division of cells followed by stabilized number of cells) in transplanted testes was similar to that in intact rats. Hypophysectomy reduced the growth of testicular grafts, and hormonal replacement via retransplantation to pituitary intact hosts enhances Sertoli cell proliferation and testicular growth. When two on four testes were transplanted into castrated males or ovariectomized female hosts for 65 days, there was no difference in the graft weights or Sertoli cell numbers between sexes of hosts. Four transplanted testes per rat produced more total testicular parenchyma and a greater number of Sertoli cells per testis than did two testes regardless of sex of the host. Transplantation of six or eight testes produced more total Sertoli cells/host than that found in testes of intact rats. Using hormonal therapy in hypophysectomized hosts, the testicular parenchymal weight was greater for pituitary-intact hosts and FSH-LH combination than the control media. There was no statistically significant difference among the media control, LH, FSH, and GH. This testicular transplant model has shown that the period of Sertoli cell proliferation can be delayed by hypophysectomy, that Sertoli cell number can be influenced by endogenous and exogenous hormones, and that a major component in regulation of testicular size is at the level of the testis. Hence, this model should facilitate study of experimental endocrine manipulation control and potential experimental intervention to increase Sertoli cell number, testicular size, and spermatogenesis. Regarding human sperm count decline in recent years, there appears to be no significant decline in Sertoli cell number or spermatogenic potential in a group of North American men. However, there was a significant decline in volume/man of Leydig cells and volume/man of Leydig cell cytoplasm. 相似文献
96.
LJ Suggs EY Kao LL Palombo RS Krishnan MS Widmer AG Mikos 《Canadian Metallurgical Quarterly》1998,9(7):653-666
We describe the preparation and bulk characterization of a cross-linked poly(propylene fumarate-co-ethylene glycol), p(PF-co-EG), hydrogel. Eight block copolymer formulations were made varying four different design parameters including: poly(ethylene glycol) (PEG) molecular weight, poly(propylene fumarate) (PPF) molecular weight, copolymer molecular weight, and ratio of PEG to PPF. Two different cross-linking formulations were also tested, one with a cross-linking monomer and one without. The extent of the cross-linking reaction and the degree of swelling in aqueous solution were determined on copolymer formulations made without a cross-linking monomer. The values of molecular weight between cross-links, Mc ranged from 300 +/- 120 to 1190 +/- 320 as determined from swelling data (n = 3). The equilibrium volume swelling ratios, Q, varied from 1.5 +/- 0.1 to 3.0 +/- 0.1. This ratio was found to increase with increasing PEG content in the copolymer and decrease with increasing PPF molecular weight. The values for complex dynamic elastic moduli magnitudes of E*, ranged from 0.9 +/- 0.2 to 13.1 +/- 1.1 MPa for the formulations with the cross-linking monomer, N-vinyl pyrrolidinone (VP) (n = 3). The ultimate tensile stresses on the formulations made with VP ranged from 0.15 +/- 0.03 to 1.44 +/- 1.06 MPa, and tensile moduli ranged from 1.11 +/- 0.20 to 20.66 +/- 2.42 MPa (n = 5). All of the mechanical properties increased with increasing PPF molecular weight and decreased with increasing PEG content in the copolymer. These data show that the physical properties of p(PF-co-EG) hydrogels can be tailored for specific applications by altering the material composition. 相似文献
97.
Sean P. Mcneil Kelvin G. Lynn Marc H. Weber Csaba Szeles Raji Soundararajan 《Journal of Electronic Materials》2003,32(6):583-585
Near-surface damage induced by saw cutting of ingots of Cd1−xZnxTe was investigated by positron-defect depth profiling. The damage extends to several micrometers depth and depends on the
cutting apparatus. The samples were polished and etched repeatedly, followed each time by positron-depth profiling. New subsurface
damage created during the polishing process is observed. No new damage is observed after etching. Positron-depth profiling
is suggested as a diagnostic tool to monitor the quality of sample surfaces. 相似文献
98.
Kelvin R. Rocha Ganesh Sundaramoorthi Anthony J. Yezzi Jerry L. Prince 《International Journal of Computer Vision》2009,85(3):223-236
We present a variational method for unfolding of the cortex based on a user-chosen point of view as an alternative to more
traditional global flattening methods, which incur more distortion around the region of interest. Our approach involves three
novel contributions. The first is an energy function and its corresponding gradient flow to measure the average visibility
of a region of interest of a surface with respect to a given viewpoint. The second is an additional energy function and flow
designed to preserve the 3D topology of the evolving surface. The third is a method that dramatically improves the computational
speed of the 3D topology preservation approach by creating a tree structure of the 3D surface and using a recursion technique.
Experiments results show that the proposed approach can successfully unfold highly convoluted surfaces such as the cortex
while preserving their topology during the evolution. 相似文献
99.
C Kong BM Gill R Rahimpour L Xu RD Feldman Q Xiao TJ McDonald L Taupenot SK Mahata B Singh DT O''Connor DJ Kelvin 《Canadian Metallurgical Quarterly》1998,88(1-2):91-98
Regional alterations in cerebral blood flow (CBF) are widely used as a surrogate for neuronal function based on an intact coupling between changes in regional CBF and metabolism, activation-flow coupling (AFC). To further investigate parameters affecting AFC, we have implemented a rat model with electrical forepaw stimulation under alpha-chloralose anesthesia using laser Doppler (LD) measurements of flow parameters through thinned skull over contralateral somatosensory cortex. Signal averaging of the LD response was used to improve reproducibility. A characteristic flow response to electrical forepaw stimulation was reliably recorded from the somatosensory cortex using signal averaging. Stimulation at 5 Hz maximized the LD response, and constant current stimulation up to 1 mA did not induce changes in systemic blood pressure. The shape of the flow response consisted of an initial peak followed by a steady state plateau phase which was observed for stimulation durations longer than 4 s. When individual LD parameters of velocity, red blood cell concentration (CRBC), and cerebral blood flow (CBF) were compared, changes in LDCBF were primarily attributable to changes in LDvelocity rather than LDCRBC. This finding was also observed during hypercapnia. Characterization of AFC in the model provides a background for future studies of the effects of pharmacological manipulation or pathophysiological states. 相似文献
100.