全文获取类型
收费全文 | 425篇 |
免费 | 0篇 |
专业分类
化学工业 | 2篇 |
机械仪表 | 2篇 |
轻工业 | 1篇 |
无线电 | 1篇 |
冶金工业 | 418篇 |
自动化技术 | 1篇 |
出版年
2009年 | 1篇 |
2004年 | 2篇 |
2001年 | 1篇 |
1999年 | 8篇 |
1998年 | 112篇 |
1997年 | 61篇 |
1996年 | 54篇 |
1995年 | 28篇 |
1994年 | 23篇 |
1993年 | 31篇 |
1992年 | 5篇 |
1991年 | 8篇 |
1990年 | 6篇 |
1989年 | 5篇 |
1988年 | 7篇 |
1987年 | 7篇 |
1986年 | 6篇 |
1985年 | 7篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1978年 | 2篇 |
1977年 | 18篇 |
1976年 | 24篇 |
1973年 | 1篇 |
1960年 | 1篇 |
排序方式: 共有425条查询结果,搜索用时 31 毫秒
421.
422.
AB Butterfield CW Miller WV Lumb FD McLeod AW Nelson MB Histand 《Canadian Metallurgical Quarterly》1977,26(2):215-224
The effect of chronically elevated blood flow on the development of atherosclerosis in miniature swine was studied. Fistulas connecting the right external iliac artery and vein were surgically created in four swine, while three were not fistulated. Pulsed Doppler velocity detection cuffs placed around the abdominal aorta and both iliac arteries of all pigs permitted chronic measurements of blood velocity, blood velocity distributions, and blood flow. All swine were fed an atherogenic diet consisting of 20% beef tallow, 3% cholesterol, and 5% cholic acid for 6 months. This diet elevated the serum cholesterol to values exceeding 500 mg/100 ml. Creation of the arteriovenous fistula (AVF) markedly elevated blood velocity and flow in the abdominal aorta and in the shunted iliac artery. In the shunted animals the aortic blood flow was 42.1 +/- 2.0 ml/sec compared with 17.3 +/- 1.4 ml/sec in the unshunted swine. The velocity distribution pattern across the vessel was also indicative of an elevated wall shear stress. After 6 months, the animals were killed and the arterial vessels examined macroscopically and microscopically for the presence of atherosclerotic lesions. In the shunted pigs, 17 +/- 15% of the lumenal surface was occupied by sudanophilic lesions, whereas 80 +/- 8% of the surface was covered by lesions in the unshunted (control) pigs. From these studies, it is apparent that mechanical factors related to blood flow rates can influence the development of atherosclerotic lesions in swine. 相似文献
423.
424.
425.
HS Kim WK Wilson ND Kirkpatrick FD Pinkerton S Swaminathan MD Hylarides GJ Schroepfer 《Canadian Metallurgical Quarterly》1992,62(1):55-67
Three-dimensional data representing biological structures can be derived using several methods, including serial section reconstruction, optical sectioning, and tomography. The investigation, comprehension, and communication of structural relationships to others is greatly facilitated by computer-based visualization procedures. We describe SYNU, a suite of programs developed for interactive investigation of three-dimensional structure and for the production of high-quality three-dimensional images and animations. We illustrate the capabilities of SYNU in applications to biological data obtained by confocal light microscopy, serial section, and high-resolution electron microscopy from investigations at the cellular, subcellular, and molecular levels. 相似文献