全文获取类型
收费全文 | 2140篇 |
免费 | 11篇 |
专业分类
电工技术 | 15篇 |
综合类 | 1篇 |
化学工业 | 71篇 |
金属工艺 | 5篇 |
机械仪表 | 9篇 |
建筑科学 | 5篇 |
矿业工程 | 1篇 |
能源动力 | 9篇 |
轻工业 | 28篇 |
水利工程 | 3篇 |
石油天然气 | 5篇 |
无线电 | 22篇 |
一般工业技术 | 60篇 |
冶金工业 | 1893篇 |
原子能技术 | 1篇 |
自动化技术 | 23篇 |
出版年
2022年 | 2篇 |
2021年 | 5篇 |
2020年 | 4篇 |
2019年 | 12篇 |
2018年 | 8篇 |
2017年 | 6篇 |
2016年 | 3篇 |
2015年 | 5篇 |
2014年 | 7篇 |
2013年 | 10篇 |
2012年 | 10篇 |
2011年 | 17篇 |
2010年 | 11篇 |
2009年 | 17篇 |
2008年 | 22篇 |
2007年 | 9篇 |
2006年 | 7篇 |
2005年 | 10篇 |
2004年 | 9篇 |
2003年 | 11篇 |
2002年 | 16篇 |
2001年 | 8篇 |
2000年 | 5篇 |
1999年 | 60篇 |
1998年 | 631篇 |
1997年 | 337篇 |
1996年 | 228篇 |
1995年 | 130篇 |
1994年 | 84篇 |
1993年 | 112篇 |
1992年 | 13篇 |
1991年 | 20篇 |
1990年 | 25篇 |
1989年 | 22篇 |
1988年 | 15篇 |
1987年 | 18篇 |
1986年 | 9篇 |
1985年 | 24篇 |
1983年 | 3篇 |
1982年 | 17篇 |
1981年 | 11篇 |
1980年 | 14篇 |
1979年 | 3篇 |
1978年 | 8篇 |
1977年 | 49篇 |
1976年 | 93篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1973年 | 2篇 |
1922年 | 1篇 |
排序方式: 共有2151条查询结果,搜索用时 15 毫秒
131.
正伯利恒钢铁公司是20世纪的一个工业集团,在世界范围内运作工业设施。它于1857年在宾夕法尼亚州里海谷(Lehigh Valley)创立,逐渐占据了里海河沿线1 800英亩(约728hm2)的场地。1995年,伯利恒钢铁公司停止了炼钢业务,关闭了厂房,结束了当地悠久的工业历史,以及成千上万蓝领居民与工厂密不可分的生活模式。 相似文献
132.
133.
134.
Acute appendicitis caused by Ascaris lumbricoides is an uncommon variant of a common disease. We describe a case in which sonography was used for preoperative diagnosis of ascaris appendicitis. 相似文献
135.
Ultra-large-scale integrated devices have been investigated by a reflection mode scanning near-field optical microscope designed for semiconductor analyses. Although it could be found that imaging the reflectivity of metal structures buried underneath thin, optically transparent passivation layers is practicable, shading of the reflected light by the SNOM probe complicated the interpretability of the achieved results. This issue has been overcome by using the SNOM probe as both illumination source and detector, simultaneously. The application of focused ion beam milling to the probes has allowed the increase of the transmittivity of the probes to such an extent that coated fibres could be utilized and the interpretability of the results could be enhanced. Furthermore, the investigated structures are of great interest for an investigation of z -motion artefacts, as the presence of the polished passivation layers allows topographical influences to be distinguished from pure optical contrast. 相似文献
136.
137.
138.
BACKGROUND: Abdominal tuberculosis (TB) is common. But the diagnosis of abdominal TB is fraught with difficulties as it is often not possible to get a microbiological confirmation of the infection. We therefore undertook this study to highlight those pertinent clinical and laboratory features which would enable one to make a provisional diagnosis of abdominal TB early, to pave way for a trial of anti-tuberculosis chemotherapy. METHOD: This is a retrospective study of 12 patients treated for abdominal TB in our department over a period of 2 years. FINDINGS: Seven of the patients suffered from chronic diarrhoea for periods ranging from 4 weeks to 12 months. Four patients had progressive abdominal distension (ascites). The last patient came in with multiple abdominal swellings. Seven patients had clinical and biochemical features of malabsorption. Another 9 patients also had persistent pyrexia. The ascitic fluid was exudative in the 4 patients mentioned earlier. A definitive diagnosis could not be established in any of these patients. The diagnosis of abdominal TB was thus one of exclusion in these patients who showed prompt response to anti-tuberculosis therapy. CONCLUSION: Our study justifies a trial of anti-TB chemotherapy in TB endemic areas in the following clinical situations: (a) patients with chronic diarrhoea of unknown aetiology and (b) patients with exudative ascitic fluid, after all other possible causes, have been excluded. A prompt response to anti-TB therapy should be accepted as sufficient ground for the diagnosis of abdominal TB even when histopathological or microbiological confirmation of the disease is not possible. Our study reflects the experience of other workers from Third World countries. 相似文献
139.
Until quite recently, the cardiodepressant actions of adenosine were widely accepted. A nucleoside that produces negative chronotropic and ionotropic effects, adenosine, has been used clinically as the drug of choice for terminating supraventricular (atrioventricular node) tachycardia and is likely to play an important part in regulating arrhythmogenic activity as an endogenous antiarrhythmic metabolite. Despite this, recent experimental data, particularly resulting from in vitro studies using animal models, have shown a paradoxical excitable action of adenosine in the heart. In this article, Amir Pelleg and Steven Kutalek present the reasons why they continue to believe that any excitatory actions of adenosine in the heart are clinically irrelevant. 相似文献
140.
Distinct stability of recombinant L and H subunits of human ferritin: calorimetric and ANS binding studies 总被引:1,自引:0,他引:1
Thermodynamic and pH stability of recombinant human L- and H-ferritins were
probed by differential scanning calorimetry and 8-anilino-1-
naphthalenesulfonate (ANS) binding in the pH range 2-7. At pH 2.0-2.8 they
were dissociated into subunit monomers and in this pH interval the
H-subunit displayed a single calorimetrically-revealed domain with
properties of a molten globule-like state: low enthalpy (6.3-8.0 J/g or
169-172 kJ/mol) and Tm of thermal unfolding (approximately 50 degrees C), a
wide transition range (approximately 20 degrees C) and high ANS binding. In
contrast, at pH 2 the L-ferritin subunit showed two calorimetric domains
with Tm of 35 and 40 degrees C with similar unfolding enthalpies and with
moderate extent of interactions, as indicated by the ratio of calorimetric
enthalpy (293.9 kJ/mol) and van't Hoff enthalpy (174.2 kJ/mol) for the
thermal transition. A pH increase from 2.0 to 2.8 determined the coupling
of the two domains into a single cooperative folding unit and drastic
increase of the transition temperature (from 37 to 80 degrees C). The
contacts between the two domains in the L-subunit appeared to contribute to
about 30% of the total stabilization free energy. The unfolding enthalpies,
heat capacity changes and pronounced ANS binding of the L-subunit at pH
2.0- 2.8 indicated that part of the structure lacked 'meltable' tertiary
interactions. The results indicate that H- and L-subunits are stabilized by
largely different intra-chain interactions with a critical contribution to
L-subunit stability of embedded salt bridge(s) absent in the H-subunit.
相似文献