全文获取类型
收费全文 | 1063篇 |
免费 | 52篇 |
国内免费 | 18篇 |
专业分类
电工技术 | 13篇 |
综合类 | 4篇 |
化学工业 | 117篇 |
金属工艺 | 28篇 |
机械仪表 | 15篇 |
建筑科学 | 56篇 |
矿业工程 | 5篇 |
能源动力 | 93篇 |
轻工业 | 89篇 |
水利工程 | 14篇 |
石油天然气 | 5篇 |
无线电 | 96篇 |
一般工业技术 | 100篇 |
冶金工业 | 366篇 |
原子能技术 | 14篇 |
自动化技术 | 118篇 |
出版年
2022年 | 9篇 |
2021年 | 13篇 |
2020年 | 4篇 |
2019年 | 10篇 |
2018年 | 4篇 |
2017年 | 73篇 |
2016年 | 13篇 |
2015年 | 16篇 |
2014年 | 22篇 |
2013年 | 43篇 |
2012年 | 58篇 |
2011年 | 44篇 |
2010年 | 37篇 |
2009年 | 31篇 |
2008年 | 38篇 |
2007年 | 35篇 |
2006年 | 30篇 |
2005年 | 37篇 |
2004年 | 37篇 |
2003年 | 22篇 |
2002年 | 22篇 |
2001年 | 29篇 |
2000年 | 21篇 |
1999年 | 25篇 |
1998年 | 53篇 |
1997年 | 45篇 |
1996年 | 34篇 |
1995年 | 22篇 |
1994年 | 32篇 |
1993年 | 33篇 |
1992年 | 22篇 |
1991年 | 11篇 |
1990年 | 12篇 |
1989年 | 24篇 |
1988年 | 19篇 |
1987年 | 13篇 |
1986年 | 12篇 |
1985年 | 16篇 |
1984年 | 16篇 |
1983年 | 13篇 |
1982年 | 8篇 |
1981年 | 10篇 |
1980年 | 7篇 |
1979年 | 8篇 |
1978年 | 7篇 |
1977年 | 4篇 |
1976年 | 10篇 |
1974年 | 7篇 |
1973年 | 3篇 |
1972年 | 4篇 |
排序方式: 共有1133条查询结果,搜索用时 31 毫秒
1.
2.
Stolorow Robert D.; Atwood George E.; Orange Donna M. 《Canadian Metallurgical Quarterly》2006,23(1):184
In omitting crucial words and sentencees, neglecting relevant citations, and overlooking important distinctions, Jon Mills' (see record 2005-04819-001) critique of relational psychoanalysis significantly misrepresents the authors' viewpoint. This viewpoint seeks to contextualize, but not to nullify, individual worlds of experience and their limiting horizons. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
3.
The intermetallic compound Mg2Ni has been prepared by the vapour exchange/diffusion reaction of the elements sealed in a stainless steel container. The product has been characterised by powder X-ray diffractometry with Mo-Kα radiation, using step-scanning and profile refinement techniques. The hexagonal unit cell has constants a = 5.2117(4), . 相似文献
4.
5.
差分式连续时间电流型CMOS跨导—电容低通滤波器 总被引:1,自引:0,他引:1
应用信号流图法对电流系统传递函数直接模拟,提出了一种新颖的差分式连续时间电流模式CMOS跨导-电容低通滤波器的实现方案。由于采用了差分式结构和电流负反馈,整个电路方案具有差分式结构和电流型电路的优点;并且仅使用最少数量的OTA和电容,与数字CMOS工艺兼容,适于全集成。面向实际电路完成了MOS管级的计算机仿真,结果表明,所提出的电路方案正确有效 相似文献
6.
Haley William E.; Larson Dale G.; Kasl-Godley Julia; Neimeyer Robert A.; Kwilosz Donna M. 《Canadian Metallurgical Quarterly》2003,34(6):626
Professional psychologists are increasingly likely to encounter opportunities to work with patients and families facing end-of-life issues. Psychologists can provide psychological assessment, intervention for patients and families, consultation with and support of health care team members, grief therapy, and program development and evaluation. Psychological services are useful for healthy individuals who wish to make thoughtful plans about their own future care, patients with life-limiting illnesses, families stressed by providing end-of-life care, bereaved individuals, and health care providers who face issues of burnout and strain. Several challenges for psychologists working in end-of-life care are noted, including training, development of clear roles, and reimbursement. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
7.
Introduces this special issue of Psychoanalytic Psychology. This special issue on Women, Psychoanalysis, and Gender is a commemoration of the capability, influence, acceptance, and authority of women in the community of psychoanalysis. In this issue, we turn to both new and more established voices in an expanded arena of gender, culture, and psychoanalysis. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
8.
Post-harvest loss of resources to microbial competitors affects a number of species of animals, and many of them have evolved behaviors that reduce the likelihood of such loss. We previously described the inhibition ofBacillus psychrophilus by dogwood fruits (Cornus drummondii), which can comprise a significant portion of the winter food cache of the eastern woodrat (Neotoma floridana). The present study is a further investigation of the ability of dogwood fruits to inhibit growth ofB. psychrophilus. Additionally, we tested the antimicrobial activity of dogwood fruits onEscherichia coli andStaphlococcus aureus. Results of our study indicate that fresh fruits inhibit the growth ofB. psychrophilus andS. aureus but notE. coli. However, fruits taken from woodrat dens after four and six months storage inhibited growth of all three species of bacteria. Further, the strength of inhibition increased over the test period. We suggest the presence of an inhibitor allows woodrats to compete effectively for a valuable and limited food resource. 相似文献
9.
无线数据通信网发展趋势 总被引:1,自引:0,他引:1
无线数据通信具有两大发展趋势,即低速的广域移动数据网及高速的局域无线数据网。本文介绍了其技术特点、应用情况和市场前景,分析了无线数据通信传输技术、网络结构和媒质接入控制等问题。 相似文献
10.
Lord Charles G.; Desforges Donna M.; Fein Steven; Pugh Marilyn A.; Lepper Mark R. 《Canadian Metallurgical Quarterly》1994,66(4):658
Social typicality effects occur when people apply their attitudes more consistently toward typical than toward atypical category members presumably because attitudes are directed toward the prototypic category member. Four studies tested whether individuals also apply social policy attitudes more consistently toward typical than toward atypical persons affected by the policy. Study 1 used attitude concept maps to assess how extensively individuals spontaneously reference the typical person affected by a social policy. Death penalty proponents did so more than did opponents; welfare proponents and opponents did so equally. In 3 other studies, death penalty proponents displayed greater typicality effects in sentencing "convicted murderers" than did opponents, welfare proponents and opponents displayed equal typicality effects in evaluating cases of suspected welfare fraud, and individuals whose attitude concept maps about welfare referred more to persons displayed greater typicality effects than did individuals whose maps referred more to principles. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献