全文获取类型
收费全文 | 3337篇 |
免费 | 251篇 |
专业分类
电工技术 | 35篇 |
综合类 | 29篇 |
化学工业 | 1166篇 |
金属工艺 | 33篇 |
机械仪表 | 69篇 |
建筑科学 | 119篇 |
矿业工程 | 6篇 |
能源动力 | 82篇 |
轻工业 | 481篇 |
水利工程 | 43篇 |
石油天然气 | 10篇 |
无线电 | 145篇 |
一般工业技术 | 525篇 |
冶金工业 | 407篇 |
原子能技术 | 14篇 |
自动化技术 | 424篇 |
出版年
2024年 | 16篇 |
2023年 | 27篇 |
2022年 | 163篇 |
2021年 | 222篇 |
2020年 | 117篇 |
2019年 | 94篇 |
2018年 | 120篇 |
2017年 | 120篇 |
2016年 | 129篇 |
2015年 | 110篇 |
2014年 | 145篇 |
2013年 | 211篇 |
2012年 | 180篇 |
2011年 | 259篇 |
2010年 | 146篇 |
2009年 | 159篇 |
2008年 | 173篇 |
2007年 | 122篇 |
2006年 | 103篇 |
2005年 | 75篇 |
2004年 | 68篇 |
2003年 | 76篇 |
2002年 | 74篇 |
2001年 | 48篇 |
2000年 | 41篇 |
1999年 | 50篇 |
1998年 | 125篇 |
1997年 | 72篇 |
1996年 | 48篇 |
1995年 | 39篇 |
1994年 | 29篇 |
1993年 | 38篇 |
1992年 | 17篇 |
1991年 | 13篇 |
1990年 | 11篇 |
1989年 | 8篇 |
1988年 | 7篇 |
1987年 | 14篇 |
1986年 | 12篇 |
1985年 | 9篇 |
1983年 | 10篇 |
1982年 | 7篇 |
1981年 | 12篇 |
1980年 | 9篇 |
1979年 | 10篇 |
1978年 | 6篇 |
1977年 | 10篇 |
1976年 | 9篇 |
1975年 | 5篇 |
1971年 | 4篇 |
排序方式: 共有3588条查询结果,搜索用时 15 毫秒
11.
Claudia Popien Axel Kuepper Bernd Meyer 《Journal of Network and Systems Management》1994,2(4):383-400
New requirements of growing computer networks and information systems have an influence on extended client/server models with increased functionality. This forms the basis for service management in distributed systems which is realized by a service trading concept. This paper studies the requirements derived from the Open Distributed Processing (ODP) Reference Model in order to consider an open service market. Furthermore, it examines management possibilities for describing the service trading scenario. Because of similar architectures and properties ODP services, service offers, types, exporters and traders are mapped onto management components and modeled as managed objects. Therefore, the Guidelines for the Definition of Managed Objects (GDMO) are used. The final concept allows a precise and unambiguous study of the service trading scenario and provides means for exporting and importing of service offers in a distributed environment. 相似文献
12.
M Valenti G Cimoli S Parodi GL Mariani M Venturini P Conte P Russo 《Canadian Metallurgical Quarterly》1993,(8):1157-1161
Synergism between recombinant human tumour necrosis factor (rHuTNF) and DNA topoisomerase II inhibitor VP16 during the killing of cells has been studied in six human ovarian cancer cell lines (A2774, A2780, SW626, IGROV-1, SKOV3, Pa1) and a cervical carcinoma cell line (Me180). Studies were performed using an assay of colony formation inhibition (drug treatment for 1 h) and a growth inhibition assay (continuous exposure for 20 h). Concomitant treatment of cells with VP16+rHuTNF enhanced cell killing in all the cell lines tested--an effect observed in both short- and long-term cytotoxicity assays. This study suggests that the activity of VP16 in ovarian cancer cell lines might be enhanced by rHuTNF in in vitro models. 相似文献
13.
V Ducceschi B Sarubbi A Giasi B Russo P Lucca L Santangelo M Giasi A Iacono 《Canadian Metallurgical Quarterly》1996,53(3):285-290
This article is based on the current draft of a new AAMI equipment management standard (AAMI EQ56). Until now, no documentation has clearly specified the requirements for an equipment management program. At the time of the writing of this article, a February 1996 Committee Draft of the new standard was out for ballot and public review. Comments will be reviewed at a meeting of the AAMI Patient-Care Equipment Management Committee in June 1996, in conjunction with the AAMI Annual Meeting, and the standard could be formalized as early as October 1996. Readers should keep in mind that, while the final standard may differ somewhat from the material presented here, the author of this article and BI&T's staff felt that the interest of a very large portion of the AAMI membership warranted an advance article describing the content and general direction of the document. 相似文献
14.
Dipl.-Biol. Michael Gommel Claudia Raichle Patrick Müller Frieder Keller 《Ethik in der Medizin》2005,17(1):21-27
Definition of the problem: Ethical reasoning cannot be enforced. Voluntary understanding is a basic condition for the development of ethical competencies and attitudes. The aim of this survey was to investigate whether the presence of those students who attended our seminars compulsorily would have a negative effect upon the quality of the course. Methods and results: The participants of our small-group seminars in medical ethics were asked to complete a questionnaire on teaching aims, seminar atmosphere, moderation and importance of subjects. One hundred and ninety-two voluntary participants (2001/2) and 293 compulsory participants (2002/3) completed the questionnaire and were statistically compared. There was no significant difference between voluntary and compulsory participants in any of the important items. However, there were considerable differences in some items between male and female participants. Conclusion: We were surprised that there was no difference between the two groups. This leads us to hope that our concept of case-based small-group seminars will prove capable of realising our teaching aims for all students. The difference between male and female participants may have important didactic consequences and will be the subject of further studies. 相似文献
15.
Specific interactions in blends containing Chitosan and functionalized polymers. Molecular dynamics simulations 总被引:2,自引:0,他引:2
Chitosan (CS)/poly(vinyl alcohol) (PVA) and Chitosan/poly(2-hydroxyethyl methacrylate) (P2HEM) blends have been studied through molecular dynamic simulations. In a previous work it was found miscibility between these polymers and it was attributed to hydrogen bonding formation. However, the experimental information obtained was not enough to know which of the interacting groups of Chitosan, i.e. -CH2OH or -NH2, are responsible of the interaction. Therefore, we have performed molecular dynamics simulation runs of 1 ns in order to calculate radial distribution functions (RDF) for the groups tentatively involved in the interaction. The results are correlated with our previous experimental data. This way, we have obtained a more precise conclusive information about the interactions involved as function of the blends composition. For low compositions of PVA and P2HEM the interaction is predominantly with the hydroxymethyl groups of CS while as the composition of PVA and P2HEM increases, the interaction with the amine groups increases. 相似文献
16.
Ottavia Colombo Simona Villani Giovanna Pinelli Claudia Trentani Maurizia Baldi Orazio Tomarchio Anna Tagliabue 《Nutrition journal》2008,7(1):5
Background
Excess body fat is a major risk factor for disease primarily due to its endocrine activity. In recent years several criteria have been introduced to evaluate this factor. Nevertheless, treatment need is currently assessed only on the basis of an individual's Body Mass Index (BMI), calculated as body weight (in kg) divided by height in m2. The aim of our study was to determine whether application of the BMI, compared to adiposity-based criteria, results in underestimation of the number of subjects needing lifestyle intervention. 相似文献17.
The current era of Information, Communication and Media Technologies (ICMT) has ushered in the era of eBusiness and the Information Society where traditional managerial paradigms are challenged and new business models are sought. One central area of managerial discourse is STRATEGY. Based upon a pilot study with leading European managers, consultants and academics, we offer a structured perspective on what may be the shape of things to come for STRATEGIC PLANNING in the context of eBusiness and the Information Society. Normative implications are explored. 相似文献
18.
The Supreme Court has relied on psychological assumptions in adolescent abortion cases, but it has failed to consider relevant empirical research. The work of the Interdivisional Committee on Adolescent Abortion to fill in this gap provides a model for organized psychology's integration, dissemination, and application of psychological knowledge to promote the public interest. Such efforts should be replicated by state associations. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
19.
Claudia Stewart Nicole Lum Robert Hill Robert Stephens Paul Rudnick Lynn Rassmussen 《Journal of The Association for Laboratory Automation》2003,8(2):64-65
Primer walking of cloned DNA is a standard research tool. It has been used in the past to determine the sequence of individual clones of interest. With the expansion of DNA sequencing capacity the need to be able to walk larger numbers of clones has become necessary. Our laboratory is a mid-sized genomics facility. In conjunction with the Advanced Biomedical Computing Center (ABCC) we have developed methods for automating the primer selection, DNA sequencing, contig assembly and sequence analysis for clones arrayed in microtiter format. This approach has allowed us to walk 475 clones (five microtiter plates) selected from a cDNA library. 相似文献
20.
R Martinez A Saponaro R Russo G Dragagna N Leopardi L Santoro E Martelli 《Canadian Metallurgical Quarterly》1993,35(1):9-11
Cytokines are central to the development of effective immunity against microbial pathogens and their beneficial effects in the control of a variety of infections of man and animals are well-documented. However, it appears that cytokines may also have detrimental effects in infections by actually enhancing microbial growth. These observations emphasise the fact that many successful pathogens possess mechanisms enabling them to evade the immune response and that caution needs to be exercised in using cytokines as therapeutic agents to control infections in various human diseases. 相似文献