全文获取类型
收费全文 | 927篇 |
免费 | 5篇 |
专业分类
电工技术 | 3篇 |
化学工业 | 47篇 |
金属工艺 | 4篇 |
机械仪表 | 5篇 |
建筑科学 | 19篇 |
矿业工程 | 2篇 |
能源动力 | 12篇 |
轻工业 | 41篇 |
水利工程 | 1篇 |
石油天然气 | 1篇 |
无线电 | 26篇 |
一般工业技术 | 62篇 |
冶金工业 | 658篇 |
原子能技术 | 5篇 |
自动化技术 | 46篇 |
出版年
2021年 | 5篇 |
2020年 | 2篇 |
2019年 | 5篇 |
2018年 | 2篇 |
2017年 | 2篇 |
2016年 | 7篇 |
2015年 | 3篇 |
2014年 | 4篇 |
2013年 | 15篇 |
2012年 | 10篇 |
2011年 | 23篇 |
2010年 | 15篇 |
2009年 | 13篇 |
2008年 | 16篇 |
2007年 | 11篇 |
2006年 | 9篇 |
2005年 | 12篇 |
2004年 | 5篇 |
2003年 | 13篇 |
2002年 | 9篇 |
2001年 | 7篇 |
2000年 | 11篇 |
1999年 | 20篇 |
1998年 | 175篇 |
1997年 | 105篇 |
1996年 | 80篇 |
1995年 | 38篇 |
1994年 | 54篇 |
1993年 | 42篇 |
1992年 | 4篇 |
1991年 | 12篇 |
1990年 | 10篇 |
1989年 | 12篇 |
1988年 | 9篇 |
1987年 | 5篇 |
1986年 | 5篇 |
1985年 | 7篇 |
1984年 | 3篇 |
1982年 | 5篇 |
1981年 | 7篇 |
1980年 | 11篇 |
1978年 | 4篇 |
1977年 | 40篇 |
1976年 | 63篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1973年 | 3篇 |
1972年 | 2篇 |
1968年 | 2篇 |
1967年 | 3篇 |
排序方式: 共有932条查询结果,搜索用时 15 毫秒
1.
Muntasir Hashim Farnoosh Farhad David Smyth‐Boyle Robert Akid Xiang Zhang Philip J. Withers 《工业材料与腐蚀》2019,70(11):2009-2019
The environmental performance of 316L grade stainless steel, in the form of tensile specimens containing a single corrosion pit with various aspect ratios, under cyclic loading in aerated chloride solutions is investigated in this study. Results from environmental tests were compared and contrasted with those obtained using finite element analysis (FEA). Fractography of the failed specimens obtained from experiments revealed that fatigue crack initiation took place at the base of the shallow pit. The crack initiation shifted towards the shoulder and the mouth of the pit for pits of increasing depth. This process is well predicted by FEA, as the strain contour maps show that strain is the highest around the centric strip of the pit. However, for shallow pits, local strain is uniformly distributed around that strip but begins to concentrate more towards the shoulder and the mouth region for increasingly deep pits. 相似文献
2.
CA Boyle 《Canadian Metallurgical Quarterly》1997,11(2-3):271-274
The developing central nervous system seems to be particularly vulnerable to chemical insults. A model for developmental disabilities surveillance is presented that provides a reasonable framework for monitoring the prevalence of various developmental abnormalities in human populations. Effective monitoring will not only increase the likelihood of detecting the adverse effects of new physical or chemical agents in the environment but will provide a readily available case series for specially directed case-control studies. A specific example is provided of a large case-control study of cerebral palsy and intrapartum magnesium exposure among very low birth weight children, which is being conducted within the framework of a developmental disabilities surveillance program. 相似文献
3.
4.
5.
MH Boyle DR Offord D Campbell G Catlin P Goering E Lin YA Racine 《Canadian Metallurgical Quarterly》1996,41(9):549-558
OBJECTIVE: To describe the methodology of a province-wide, cross-sectional, epidemiologic study of psychiatric disorder among those aged 15 years and over living in household dwellings in Ontario. METHOD: Respondents for the survey were drawn from households (N = 13002) participating in a province-wide health survey. One person per household was selected, and 9953 (76.5%) participated. RESULTS: Participants and nonparticipants were similar to each other. An extensive array of data, including measures of psychiatric disorder classified using a revised version of the Composite International Diagnostic Interview (CIDI), are available for all respondents. CONCLUSIONS: The Ontario Health Supplement is contained in a public-use data file at the Ontario Ministry of Health and is available to investigators for study. A strong survey design, careful measurement, and acceptable levels of response provide the rationale for our inviting researchers to access and use the Ontario Health Supplement data base. 相似文献
6.
We present a case where a Wiktor intracoronary stent was inserted for 'poor angiographic result' following balloon angioplasty. Despite appropriate positioning and repeated dilation of the stent a suboptimal result was achieved because of plaque herniation through the stent. The case emphasizes that the choice of stent used is important and will become more so as the number of choices available increases. 相似文献
7.
8.
9.
10.