全文获取类型
收费全文 | 249篇 |
免费 | 1篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 2篇 |
综合类 | 1篇 |
化学工业 | 20篇 |
金属工艺 | 5篇 |
机械仪表 | 2篇 |
建筑科学 | 34篇 |
矿业工程 | 1篇 |
能源动力 | 8篇 |
轻工业 | 31篇 |
水利工程 | 2篇 |
石油天然气 | 1篇 |
无线电 | 10篇 |
一般工业技术 | 46篇 |
冶金工业 | 63篇 |
原子能技术 | 1篇 |
自动化技术 | 25篇 |
出版年
2021年 | 1篇 |
2020年 | 1篇 |
2019年 | 5篇 |
2018年 | 4篇 |
2017年 | 2篇 |
2016年 | 1篇 |
2014年 | 5篇 |
2013年 | 15篇 |
2012年 | 8篇 |
2011年 | 14篇 |
2010年 | 13篇 |
2009年 | 14篇 |
2008年 | 9篇 |
2007年 | 23篇 |
2006年 | 9篇 |
2005年 | 3篇 |
2004年 | 10篇 |
2003年 | 6篇 |
2002年 | 7篇 |
2001年 | 3篇 |
2000年 | 4篇 |
1999年 | 6篇 |
1998年 | 14篇 |
1997年 | 6篇 |
1996年 | 9篇 |
1995年 | 10篇 |
1994年 | 9篇 |
1993年 | 6篇 |
1992年 | 1篇 |
1991年 | 5篇 |
1990年 | 4篇 |
1989年 | 1篇 |
1988年 | 4篇 |
1987年 | 3篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1977年 | 1篇 |
1976年 | 3篇 |
1974年 | 1篇 |
1972年 | 1篇 |
1969年 | 1篇 |
1954年 | 1篇 |
1951年 | 1篇 |
排序方式: 共有252条查询结果,搜索用时 93 毫秒
11.
Cousinou M Nilsen B López-Barea J Dorado G 《The Science of the total environment》2000,247(2-3):213-225
12.
C Beisland S Kolltveit BH Nilsen NH Hagness 《Canadian Metallurgical Quarterly》1998,118(12):1860-1862
Tetanus has become an uncommon disease in developed countries. Tetanus is caused by exotoxins from the bacteria Clostridium tetani. This microbe, which is obligate anaerobe, is present in soil, and animal and human faeces. The condition usually appears after contamination of wounds. However, reports have been published of tetanus occurring after both acute and selective gastrointestinal surgery. We present a case of severe postoperative tetanus in a 57 year-old woman who underwent bowel resection after strangulation of the ileum. The patient was treated on an intensive care unit and was artificially ventilated for 64 days. Seven months later she had fully recovered. Clinical presentation, diagnosis, treatment, and complications are discussed in the report. The diagnosis of tetanus is made by clinical observation. Nowadays, lack of suspicion of this condition may cause delay in administering proper treatment. Women and older men are often inadequately immunized. Doctors should therefore examine the immunization status of these groups of patients regularly. 相似文献
13.
David L. Trimm Anders Holmen Odd Lindvag 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1981,31(1):311-316
Studies have been carried out on the effect of pre-sulphiding a nickel-chromium-iron alloy on coke formation under steam cracking conditions. Pre-sulphiding has no great effect on the gaseous product spectrum as long as some sulphur is present, but the coking rate is dependent on the amount of sulphur pre-deposited. Small amounts of sulphur reduce the coke formation, but the coking rate increases with increasing amounts of pre-deposited sulphur. As the sulphur content increases still further, coke formation passes through a maximum. A tentative explanation of these observations is advanced in terms of the effect of metal sulphides on the established mechanism of coke formation. Initial sulphiding is suggested to increase grain boundary penetration by coke and to result in the accumulation of iron sulphide on the surface. Eventually this may act to seal off grain boundaries, thereby inhibiting further coke formation. 相似文献
14.
15.
Technological change as a trade-off between social construction and technological paradigms 总被引:2,自引:0,他引:2
The theory of social construction of technology (SCOT) and the theory of technological paradigms (TTP) are normally regarded as competing or even incompatible perspectives on technological change. In this paper, we show how and when the perspectives are complementary by comparing how the theories conceptualise technology development, understand stakeholders, and determine driving forces for technological change. When stakeholders have different relations to the innovation process, and when the outcome of the innovation process is open, we argue that the two theories could be complementary tools for analysing the process. When using SCOT and TTP as complementary analytical tools, it becomes easier to understand and design innovation processes in which different stakeholders are attached to roles where they are able to contribute in the most productive ways. 相似文献
16.
A multiagent framework for coordinated parallel problem solving 总被引:1,自引:1,他引:0
Today’s organizations, under increasing pressure on the effectiveness and the increasing need for dealing with complex tasks
beyond a single individual’s capabilities, need technological support in managing complex tasks that involve highly distributed
and heterogeneous information sources and several actors. This paper describes CoPSF, a multiagent system middle-ware that
simplifies the development of coordinated problem solving applications while ensuring standard compliance through a set of
system services and agents. CoPSF hosts and serves multiple concurrent teams of problem solving contributing both to the limitation
of communication overheads and to the reduction of redundant work across teams and organizations. The framework employs (i) an interleaved task decomposition and allocation approach, (ii) a mechanism for coordination of agents’ work, and (iii) a mechanism that enables synergy between parallel teams. 相似文献
17.
B. Nilsen 《Bulletin of Engineering Geology and the Environment》2000,58(3):173-178
The paper discusses alternative approaches to stability analyses including the traditional deterministic principle, the so-called
partial factor principle and the probabilistic approach which assesses the probability of failure rather than the factor of
safety. To illustrate the different principles and approaches, stability analyses of road cuts near Trondheim, central Norway,
are used as examples. It is concluded that although the traditional deterministic approach has the advantage of being well
established and easy to understand, to conform with new standards and guidelines it is likely to be replaced by the partial
factor principle. To obtain the best possible basis for evaluation it is useful to include a probabilistic analysis.
Received: 5 August 1999 · 28 August 1999 相似文献
18.
Anna-Lena Kjøniksen Bo Nyström Torgeir Nakken Odd Palmgren Terje Tande 《Polymer Bulletin》1997,38(1):71-79
Oscillatory shear, shear relaxation and viscosity experiments have been carried out on semidilute solutions of chitosan and
on a hydrophobically modified analogue (HM-chitosan) in 1% acetic acid. This was done in the presence of various amounts of
cetyltrimethylammonium bromide (CTAB) and at different pH values. All the rheological measurements on the HM-chitosan solutions
revealed significant polymer-surfactant interaction and pH effects. The observed rheological effects were least pronounced
at pH ≈ 4, while a strong viscoelastic response was found at pH values of 1 and 5 in HM-chitosan solutions of low surfactant
concentration. At these conditions, significant shear-thinning effects were observed. In semidilute solutions of unmodified
chitosan, the influence of pH, surfactant concentration and shear rate on the rheological properties was moderate or insignificant.
Received: 25 September 1996/Revised version: 30 October 1996/Accepted: 4 November 1996 相似文献
19.
Indentation studies were carried out on a two-phase model system of alpha-beta brass so as to understand the role of phase boundary on the propagation of deformation. Unlike in the case of uniaxial loading, the phase boundary acts as a very effective barrier for slip propagation, irrespective of its geometry. 相似文献
20.
Odd Jostein Svendsli 《今日电子》2010,(1):28-31
锂离子电池由于拥有能量密度高、电压高、自放电率低,以及无记忆效应等优势,因而逐渐成为使用充电电池的便携应用产品的常用技术。 相似文献