全文获取类型
收费全文 | 1126篇 |
免费 | 0篇 |
专业分类
化学工业 | 15篇 |
金属工艺 | 18篇 |
机械仪表 | 1篇 |
建筑科学 | 4篇 |
矿业工程 | 1篇 |
轻工业 | 7篇 |
石油天然气 | 5篇 |
无线电 | 7篇 |
一般工业技术 | 40篇 |
冶金工业 | 1025篇 |
自动化技术 | 3篇 |
出版年
2018年 | 2篇 |
2013年 | 3篇 |
2012年 | 1篇 |
2011年 | 2篇 |
2009年 | 4篇 |
2008年 | 2篇 |
2007年 | 3篇 |
2006年 | 3篇 |
2005年 | 5篇 |
2004年 | 3篇 |
2003年 | 6篇 |
2002年 | 4篇 |
2001年 | 2篇 |
2000年 | 4篇 |
1999年 | 31篇 |
1998年 | 359篇 |
1997年 | 195篇 |
1996年 | 114篇 |
1995年 | 59篇 |
1994年 | 36篇 |
1993年 | 71篇 |
1992年 | 6篇 |
1991年 | 11篇 |
1990年 | 5篇 |
1989年 | 9篇 |
1988年 | 8篇 |
1987年 | 9篇 |
1986年 | 9篇 |
1985年 | 12篇 |
1984年 | 3篇 |
1983年 | 3篇 |
1982年 | 12篇 |
1981年 | 6篇 |
1980年 | 10篇 |
1979年 | 5篇 |
1978年 | 1篇 |
1977年 | 13篇 |
1976年 | 69篇 |
1975年 | 2篇 |
1974年 | 1篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1971年 | 5篇 |
1970年 | 1篇 |
1969年 | 1篇 |
1967年 | 2篇 |
1966年 | 2篇 |
1965年 | 1篇 |
1963年 | 2篇 |
1962年 | 1篇 |
排序方式: 共有1126条查询结果,搜索用时 187 毫秒
51.
RT Matheson DR Miller MJ Lacombe YN Han S Iwanaga H Kato KD wuepper 《Canadian Metallurgical Quarterly》1976,58(6):1395-1406
Flaujeac trait is the functional deficiency of a plasma protein of the intrinsic coagulation, kinin-forming, and plasma fibrinolytic pathways. The Flaujeac factor in man has been isolated and tentatively identified as a kininogen of high molecular weight (HMW). Highly purified bovine HMW-kininogen, but not bovine low molecular weight kininogen, repaired Flaujeac factor deficiency. The two subspecies of this molecule, HMW-kininogen a and HMW-kininogen b, also corrected Flaujeac factor deficiency. When bovine HMW-kininogen was incubated with bovine plasma kallikrein, kinin-free HMW-kininogen, bradykinin, and a glycopeptide fragment (peptide 1-2; 12,584 daltons) were rapidly released. None of these fragmentation products corrected Flaujeac factor deficiency alone or in mixtures. The function of HMW-kininogen appeared to depend upon the structural integrity of the native molecule. When injected in concentrations of 2 pmol-8 nmol/0.1 ml, peptide 1-2 caused increased vascular permeability in rabbits, rats, or guinea pigs. The enhanced permeability was maximal within 1-2 min and terminated in 5-10 min, differing from that of bradykinin or histamine. Injected together in equimolar amounts, peptide 1-2 and bradykinin produced a synergistic permeability response which was immediate in onset as well as prolonged in duration. Peptide 1-2 is a rapidly acting, highly basic glyco-peptide which mediates increased vascular permeability in a complementary and synergistic manner with bradykinin. 相似文献
52.
53.
54.
Minc N Fütterer C Dorfman KD Bancaud A Gosse C Goubault C Viovy JL 《Analytical chemistry》2004,76(13):3770-3776
We present an experimental study of the microfluidic electrophoresis of long DNA in self-assembling matrixes of magnetic bead columns. Results are presented for the rapid separation of lambda-phage, 2lambda-DNA, and bacteriophage T4 DNA, where separation resolutions greater than 2 between lambda and T4 are achieved in times as short as 150 s. The use of a computer-piloted flow control system and injection results in high reproducibility between separations. We compare the experimentally measured mobility and dispersion with an exactly solvable lattice Monte Carlo model. The theory predicts that the mean velocity scales linearly with the field, the band broadening scales with the inverse of the field, and the resolution is independent of the field for intermediate fields-all of which are in accord with the experimental results. Moreover, reasonable quantitative agreement is achieved for band broadening for longer DNA (2lambda and T4) when the average postengagement time is measured experimentally. This work demonstrates the possibility of achieving fast microfluidic separation of large DNA on a routine basis. 相似文献
55.
A. L. Dorfman 《Journal of Engineering Physics and Thermophysics》1983,44(6):636-642
Results are presented from a study of the flow structure and mass transfer in a combustion chamber employing the microflame diffusion principle of combustion in a twisted flow. The study was conducted with an isothermal computational model. 相似文献
56.
57.
58.
KD Paulsen MI Miga FE Kennedy PJ Hoopes A Hartov DW Roberts 《Canadian Metallurgical Quarterly》1999,46(2):213-225
Recent advances in the field of stereotactic neurosurgery have made it possible to coregister preoperative computed tomography (CT) and magnetic resonance (MR) images with instrument locations in the operating field. However, accounting for intraoperative movement of brain tissue remains a challenging problem. While intraoperative CT and MR scanners record concurrent tissue motion, there is motivation to develop methodologies which would be significantly lower in cost and more widely available. The approach we present is a computational model of brain tissue deformation that could be used in conjunction with a limited amount of concurrently obtained operative data to estimate subsurface tissue motion. Specifically, we report on the initial development of a finite element model of brain tissue adapted from consolidation theory. Validations of the computational mathematics in two and three dimensions are shown with errors of 1%-2% for the discretizations used. Experience with the computational strategy for estimating surgically induced brain tissue motion in vivo is also presented. While the predicted tissue displacements differ from measured values by about 15%, they suggest that exploiting a physics-based computational framework for updating preoperative imaging databases during the course of surgery has considerable merit. However, additional model and computational developments are needed before this approach can become a clinical reality. 相似文献
59.
A. M. Dorfman A. M. Lyakhovich V. I. Povstugar S. G. Bystrov 《Protection of Metals and Physical Chemistry of Surfaces》2000,36(3):258-263
A layer of hexamethyleniminem-nitrobenzoate was modified in low-temperature plasma on the air-oxidized iron surface. The composition and physicochemical properties of the modified inhibitor was studied by XPES and atomic force microscopy. It was assumed and then justified that the enhanced protective properties of a plasma-treated coating are due to the formation of corrosion-resistant iron nitrides and oxides, as well as new nitrogen- and oxygen-containing organic compounds with better inhibitive and adhesive abilities. Plasma-induced polymerization of the coating results in a high-strength, dense hydrophobic film that seems to be responsible for its enhanced barrier properties. 相似文献
60.