全文获取类型
收费全文 | 4312篇 |
免费 | 62篇 |
国内免费 | 10篇 |
专业分类
电工技术 | 44篇 |
综合类 | 2篇 |
化学工业 | 401篇 |
金属工艺 | 82篇 |
机械仪表 | 168篇 |
建筑科学 | 56篇 |
矿业工程 | 3篇 |
能源动力 | 112篇 |
轻工业 | 83篇 |
水利工程 | 26篇 |
石油天然气 | 8篇 |
无线电 | 510篇 |
一般工业技术 | 485篇 |
冶金工业 | 1860篇 |
原子能技术 | 19篇 |
自动化技术 | 525篇 |
出版年
2023年 | 26篇 |
2022年 | 57篇 |
2021年 | 57篇 |
2020年 | 49篇 |
2019年 | 53篇 |
2018年 | 66篇 |
2017年 | 57篇 |
2016年 | 81篇 |
2015年 | 54篇 |
2014年 | 65篇 |
2013年 | 171篇 |
2012年 | 88篇 |
2011年 | 129篇 |
2010年 | 106篇 |
2009年 | 99篇 |
2008年 | 102篇 |
2007年 | 96篇 |
2006年 | 90篇 |
2005年 | 80篇 |
2004年 | 59篇 |
2003年 | 60篇 |
2002年 | 66篇 |
2001年 | 55篇 |
2000年 | 63篇 |
1999年 | 107篇 |
1998年 | 632篇 |
1997年 | 344篇 |
1996年 | 255篇 |
1995年 | 139篇 |
1994年 | 125篇 |
1993年 | 155篇 |
1992年 | 60篇 |
1991年 | 54篇 |
1990年 | 54篇 |
1989年 | 52篇 |
1988年 | 48篇 |
1987年 | 40篇 |
1986年 | 40篇 |
1985年 | 46篇 |
1984年 | 23篇 |
1983年 | 34篇 |
1982年 | 36篇 |
1981年 | 37篇 |
1980年 | 36篇 |
1979年 | 34篇 |
1978年 | 17篇 |
1977年 | 53篇 |
1976年 | 74篇 |
1975年 | 14篇 |
1973年 | 11篇 |
排序方式: 共有4384条查询结果,搜索用时 15 毫秒
961.
This article describes an overall video network architecture with primary focus on the ATM subnetwork. The ATM subnetwork provides efficient switching capability for providing constant bit rate and variable bit rate video communication services. The ATM subnetwork can support multiple access networks like hybrid fiber coax (HFC), asymmetric digital subscriber line (ADSL), and fiber to the curb (FTTC). A broadband network controller is presented as the external controller for the ATM subnetwork which performs the functions of the session/network manager and the ATM-based connection management. The initial deployment of video is likely to be permanent virtual connection (PVC)-based, so a dynamic PVC-based scenario is described. The ATM switch architecture presented here has been optimized to support video applications. An evolution to the switched virtual connection environment and support of multiple services over the ATM subnetwork is also addressed. Traffic management schemes are discussed which provide the negotiated quality of service to the connections 相似文献
962.
Diltiazem, a calcium ion channel blocker, already in use in cardiovascular therapeutics, has been observed to protect against bone marrow damage (cytogenetic damage, cell death) and mortality in whole body irradiated mice. The micronuclei fraction in bone marrow cells of whole body irradiated (60Co gamma rays, 2.0 Gy) mice was reduced from 2.24 +/- 0.23% to about 0.74 +/- 0.33% by preirradiation administration (-20 min) of 110 mg/kg body wt. diltiazem (ip). Endogenous colony forming unit counts in spleen of mice administered 110 mg/kg body wt. (-20 min) of diltiazem before 10 Gy whole body irradiation were 6 times more than untreated irradiated controls. Pretreatment with diltiazem accelerated the recovery of radiation induced weight loss also. Diltiazem (110 mg/kg body wt, -20 min) enhanced 30 day survival to about 95% and 85% after lethal whole body absorbed dose of 9 and 10 Gy respectively and also mitigated radiation induced life- span shortening. Post-irradiation (10 Gy) administration of diltiazem (+20 to 30 min) enhanced survival from about 2 to 15% only but was highly significant (P < 0.001). Possible modes of radioprotective action of diltiazem have been discussed. 相似文献
963.
We studied the effect of tumor necrosis factor alpha (TNF-alpha) on transforming growth factor beta (TGF-beta) secretion by human breast cell lines to further characterize the antitumor effects of TNF-alpha. We found that TNF-alpha increased the secretion of TGF-beta in two established breast cancer cell lines (MCF-7 and ZR-75-1) but not in two immortalized human mammary epithelial cell lines (184B5 and MCF-10A). In MCF-7 cells, TNF-alpha increased the secretion of total TGF-beta 6.1-fold within 72 h in a dose-dependent manner. The secretion of both latent and active forms of TGF-beta was increased, and their ratio altered from 25:1 to 12:1 in the medium. TNF-alpha converted the secretory pattern of TGF-beta by MCF-7 cells from the heterodimeric form TGF-beta1.2 to the homodimeric form TGF-beta2. Immunoblot analysis under nonreducing conditions identified four molecular mass species of TGF-beta secreted in the culture media of untreated MCF-7 cells (238, 210, 40-55, and 25 kDa). Under reducing conditions, three molecular mass species of TGF-beta were identified: 88, 44, and 12 kDa. Gel filtration analysis demonstrated that the secreted TGF-beta within the range of 12-88 kDa was biologically active. TNF-alpha treatment did not alter the size of molecular mass species secreted by MCF-7 cells and did not change steady-state levels of mRNA for TGF-beta1 or TGF-beta2. These findings indicate that TNF-alpha may regulate quantitatively and qualitatively TGF-beta secretion by human breast cancer cells in vitro. The diverse biological activities of TGF-beta may also allow TNF-alpha to regulate the growth and metabolism of human mammary epithelial cells and/or stromal cells in a paracrine manner. 相似文献
964.
A. Jain O. Duygulu D.W. Brown C.N. Tom S.R. Agnew 《Materials Science and Engineering: A》2008,486(1-2):545-555
The grain size dependence of the tensile properties and the deformation mechanisms responsible for those properties are examined for Mg alloy, AZ31B, sheet. Specifically, the Hall–Petch effect and strain anisotropy (r-value) are characterized experimentally, and interpreted using polycrystal plasticity modeling. {1 0 . 2} extension twins, {1 0 . 1} contraction twins, and so-called “double-twins” are observed via microscopy and diffraction-based techniques, and the amount of twinning is found to increase with increasing grain size. For the sheet texture and tensile loading condition examined, {1 0 . 2} extension twinning is not expected, yet the polycrystal plasticity model predicts the observed behavior, including this ‘anomalous’ tensile twinning. The analysis shows that the Hall–Petch strength dependence, of the polycrystal as a whole, is primarily determined by the grain size dependence of the strength of the prismatic slip systems. 相似文献
965.
MK Popkin AL Callies EA Colón RD Lentz DE Sutherland 《Canadian Metallurgical Quarterly》1993,34(3):251-258
To examine the role of psychiatric diagnosis in the surgical outcome of pancreas transplantation, we studied candidates with type I diabetes mellitus. Eighty of 140 candidates underwent transplantation. Survival analysis found the extent of human leukocyte antigen-DR (HLA-DR) matching, two diagnoses, and patients' perceived support from first-degree relatives to be related to duration of full-graft function. Lifetime diagnoses of tobacco use disorder (P = 0.029) and alcohol abuse/dependence (P = 0.006) were associated with less favorable outcomes; perceived support was associated with positive outcomes (P = 0.048). Subsequent analysis suggested that the four variables independently and directly affect outcome. 相似文献
966.
967.
G Burns MK Crawford Company FH Dacol EM rd Company TM Shaw 《Canadian Metallurgical Quarterly》1989,40(10):6717-6720
968.
969.
970.
Hemant K. Jain 《Information & Management》1985,9(5):269-281
This paper presents an overview of an interactive system for the design of a distributed computer system. The system helps the designer in finding the optimal combination of processors of varying power to be located at various nodes of the system. It also helps in finding the optimal allocation of data files or databases. The system allows the designer to trade-off between the conflicting objectives: low investment and operating cost and high availability of data. Reasonable relative weights are assigned to each data file, and design objectives can be assigned priorities. A value added network such as TELENET is assumed for data communication. Also, multiple copies of the data file or database may exist in the system to achieve higher data availability and better response time. 相似文献