全文获取类型
收费全文 | 4537篇 |
免费 | 74篇 |
国内免费 | 5篇 |
专业分类
电工技术 | 48篇 |
综合类 | 6篇 |
化学工业 | 804篇 |
金属工艺 | 93篇 |
机械仪表 | 57篇 |
建筑科学 | 272篇 |
矿业工程 | 55篇 |
能源动力 | 122篇 |
轻工业 | 407篇 |
水利工程 | 61篇 |
石油天然气 | 27篇 |
武器工业 | 1篇 |
无线电 | 286篇 |
一般工业技术 | 650篇 |
冶金工业 | 1199篇 |
原子能技术 | 35篇 |
自动化技术 | 493篇 |
出版年
2022年 | 30篇 |
2021年 | 49篇 |
2020年 | 34篇 |
2019年 | 45篇 |
2018年 | 53篇 |
2017年 | 39篇 |
2016年 | 51篇 |
2015年 | 27篇 |
2014年 | 72篇 |
2013年 | 275篇 |
2012年 | 140篇 |
2011年 | 223篇 |
2010年 | 181篇 |
2009年 | 146篇 |
2008年 | 217篇 |
2007年 | 196篇 |
2006年 | 209篇 |
2005年 | 209篇 |
2004年 | 170篇 |
2003年 | 138篇 |
2002年 | 108篇 |
2001年 | 83篇 |
2000年 | 90篇 |
1999年 | 102篇 |
1998年 | 136篇 |
1997年 | 94篇 |
1996年 | 95篇 |
1995年 | 76篇 |
1994年 | 87篇 |
1993年 | 75篇 |
1992年 | 70篇 |
1991年 | 52篇 |
1990年 | 75篇 |
1989年 | 74篇 |
1988年 | 58篇 |
1987年 | 59篇 |
1986年 | 55篇 |
1985年 | 59篇 |
1984年 | 80篇 |
1983年 | 50篇 |
1982年 | 70篇 |
1981年 | 64篇 |
1980年 | 50篇 |
1979年 | 44篇 |
1978年 | 35篇 |
1977年 | 35篇 |
1976年 | 31篇 |
1975年 | 28篇 |
1974年 | 28篇 |
1973年 | 27篇 |
排序方式: 共有4616条查询结果,搜索用时 15 毫秒
1.
Moustapha Moussa Amudhan Ponrajan Osvaldo H. Campanella Martin R. Okos Mario M. Martinez Bruce R. Hamaker 《International Journal of Food Science & Technology》2022,57(7):4594-4601
Traditional West African pearl millet couscous products are popular; however, their preparation is laborious, time-consuming and energy-demanding, involving agglomeration, steaming, drying and sieving steps. In this study, a process was developed to produce millet couscous using a high pressure, high temperature and low-cost single-screw extruder. The innovation was to directly process the cooked low-moisture extrudate to a couscous product by drying and milling to the appropriate particle size (ranging between 1 and 2 mm). Throughput for the traditional process as prepared for commercial sale is 50 kg per day, but with the same amount of labour, the extrusion process yields ~350 kg per day. A consumer sensory study held in Niamey (Niger) showed that the extruded millet couscous was comparable to traditional couscous, though this was dependent on selection of the proper millet variety. This novel extrusion process could stimulate small- to medium-scale manufacturing of couscous and couscous-type products in West Africa. 相似文献
2.
3.
Vivien Walsh Robin Roy Margaret Bruce Stephen Potter 《Creativity & Innovation Management》1993,2(2):78-86
A series of studies of top European and other firms has revealed patterns of design management associated with commercial success. Firms that invest resources and professional expertise in product and industrial design in traditional and new industries have been commercially more successful than firms that pay less attention to these aspects of design. As an industry matures there is a shift in emphasis from design associated with technological innovation, to designs supporting technical improvements, and then to supporting user needs, fashion and product variants. These issues are illustrated through the history of the evolution of the bicycle. 相似文献
4.
In this paper we analyse issues associated with overloads in tandem switching systems in Common Channel Signalling (CCS) networks. In particular, we examine the need for, and effectiveness of, Automatic Congestion Control (ACC), a CCS mechanism which allows a congested switching system to inform adjacent CCS nodes of its level of overload, and subsequently controls the rate at which traffic is sent to the congested node. We demonstrate the critical need for end-offices and tandem switching systems to implement some form of ACC if network performance is to be maintained during congestion, especially in tandem exchanges. In addition, we find that the presently defined ACC should be expanded to allow more levels of congestion to be reported to adjacent nodes, so that a more effective, finer grained control is produced. 相似文献
5.
Much of the writing on the psychological autopsy is reviewed. Several writers' opinions about what should be included in a comprehensive behavioral analysis conducted after an individual's death are compiled in an Appendix. Several additional and new areas to be covered in a psychological autopsy are included. The primary emphasis is on the provision of a practical guide for the working professional. Twenty-four separate factors, ranging from reconstruction of events that occurred before the death to the deceased's family death history, are presented. Some legal considerations are examined briefly in order to acquaint the professional with the significant impact that the results can have on family benefits and criminal prosecution. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
6.
7.
8.
9.
Carolyn McGregor Bruce Kneale Mark Tracy 《Journal of Network and Computer Applications》2007,30(4):1309-1323
Premature and ill term babies born in regional Australia must be moved to another hospital with Neonatal Intensive Care Unit (NICU) facilities. Transferred pre-term and critically ill term babies have higher mortality rates and much higher rates of long term disability than similar babies born in hospitals with NICU facilities. This paper details the Bush Babies Broadband project that aims to significantly improve the quality of treatment for babies born in rural, remote as well as urban areas by providing the first on-demand virtual NICU architecture in Australia. Real-time data collected from medical monitors and ventilators attached to the baby, audiovisual streams and static physiological data such as X-ray images are transmitted to the consulting Neonatologist to gain a better picture of the patient's condition than is currently available. The key contribution of this significant research is the infrastructure providing a mechanism for Neonatologists to receive information directly from a regional hospital, thereby preventing, in some cases, the immediate need to move the baby. A key benefit of this framework is that it is available to link regional hospitals with the supporting NICU Neonatologist ‘on demand’ eliminating the need to establish permanent point to point connections. This paper further describes the application of that architecture to a specific pilot connecting the Bathurst regional hospital with Neonatologists within the NICU at Nepean Hospital, Penrith Australia. 相似文献
10.
The ability to accurately and reliably predict whether an older adult will commit suicide has eluded clinicians and researchers. A random national sample of psychologists who work with older adults was surveyed regarding their perception of 36 risk factors for completed suicide and indirect self-destructive behavior in older adults. This study produced a profile of psychologists' assessment and treatment practices when working with suicidal older adults. Determining what psychologists consider to be the most salient risk factors for completed suicide is important in identifying a minimum standard that clinicians should follow when assessing older adults. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献