全文获取类型
收费全文 | 905篇 |
免费 | 1篇 |
专业分类
电工技术 | 2篇 |
化学工业 | 4篇 |
机械仪表 | 2篇 |
轻工业 | 5篇 |
石油天然气 | 4篇 |
无线电 | 1篇 |
一般工业技术 | 11篇 |
冶金工业 | 870篇 |
自动化技术 | 7篇 |
出版年
2022年 | 1篇 |
2021年 | 2篇 |
2017年 | 1篇 |
2016年 | 1篇 |
2015年 | 1篇 |
2014年 | 2篇 |
2013年 | 5篇 |
2011年 | 1篇 |
2010年 | 2篇 |
2009年 | 1篇 |
2008年 | 2篇 |
2006年 | 1篇 |
2004年 | 1篇 |
2002年 | 1篇 |
1999年 | 10篇 |
1998年 | 174篇 |
1997年 | 121篇 |
1996年 | 95篇 |
1995年 | 55篇 |
1994年 | 59篇 |
1993年 | 50篇 |
1992年 | 13篇 |
1991年 | 4篇 |
1990年 | 8篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1987年 | 3篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1983年 | 4篇 |
1982年 | 6篇 |
1981年 | 18篇 |
1980年 | 19篇 |
1978年 | 4篇 |
1977年 | 98篇 |
1976年 | 129篇 |
1975年 | 4篇 |
1974年 | 2篇 |
1954年 | 1篇 |
1899年 | 1篇 |
排序方式: 共有906条查询结果,搜索用时 15 毫秒
41.
42.
VI Veksler 《Vacuum》1983,33(3):159-163
The energy spectra of the secondary ion emission (SIE) for transition metals of the fourth period are calculated under the assumption that SIE is caused by the joint action of electron-exchange and kinetic ion emission (KIE) mechanisms. Some improvement of the KIE theory is carried out for the cases of high (of the order of tens of keV) and low (less than 2 keV) energies EO of bombarding ions. It is found that the KIE plays an essential role in SIE, starting from the EO value of the order of tens of keV. It is shown that the KIE energy spectra (1) are broader than the sputtering energy spectra by an order of magnitude, (2) differ essentially in both cases indicated, (3) show a peak (at high EO in accordance with an experiment) or a break (at low EO) near to the secondary ion energy corresponding to the KIE threshold. 相似文献
43.
44.
45.
VI Volkolup 《Canadian Metallurgical Quarterly》1977,119(10):91-93
The combined anterolateral osteoplastic fixation of the spine was carried out on 17 cases out of 73 operated upon for pathological spinal changes of various etiology. The tibial crest rigid homograft and the rib autograft on vasoneuromuscular feeding pedicle were used. Such a combination of bone grafts possessing different mechanic and osteogenic properties permitted to obtain a reliable fixation of the spine for all the period necessary for anatomic and functional reconstruction of the grafts. 相似文献
46.
In a 4 month study, a group of 16 patients with stable renal graft function receiving triple immunosuppressive therapy including cyclosporin A (Cy A) were investigated for the levels of calcium, magnesium and zinc in erythrocytes. The patients were randomized to be converted to the new microemulsion formulation (Sandimmun Neoral) in a 1:1 fashion (n = 8) or to continue with the classical formulation (Sandimmun) (n = 8). The concentrations of creatinine, phosphate, alkaline phosphatase activity, calcium, magnesium and zinc were measured twice a month in blood plasma. The concentration of calcium, magnesium and zinc in erythrocytes was also measured. The concentration of magnesium in blood plasma and erythrocytes during the study showed no deviation from normal values. The level of zinc in erythrocytes was almost twice as high as in normal healthy controls and was not dependent on Cy A formulation. Calcium content in erythrocytes of patients receiving Sandimmun was 27.6% higher than in healthy persons. Conversion of the patients to Sandimmun Neoral normalized the calcium concentration in erythrocytes and caused a transient increase of calcium levels in blood plasma. 相似文献
47.
48.
49.
NV Tat'ianko LL Gromashevskaia AD Vovk MG Kasatkina OV Liashok VI Matiash SP Iasinovy? IaN Kovgan 《Canadian Metallurgical Quarterly》1996,(5-6):119-122
In this paper, characterization is given of clinical and biochemical features of VH B course against the background of narcomania. Recordable in such patient populations are high percentage of delta hepatitis (14.2%), unusual severity of the intoxication syndrome, protracted course with exacerbations (12.2%) and recurrences (8%), outcome being a chronic hepatitis (14.2%), slower normalization of biochemical indicators, persistently low ratio of AIAT activity in diluted and whole blood sera. The persistence of viral markers in drug addicts discharged from the hospital (68%) is fraught with danger of spreading viral hepatitis of prophylactic measures are not strictly observed. 相似文献
50.
This study examines the nature and extent of the relationship between stress levels and intentions to participate in a worksite smoking cessation program among male current smokers (n = 220) employed in an automobile manufacturing plant. A plantwide survey was conducted which measured job stress, nonjob stress, smoking behavior, and intent to participate. The results of polychotomous logistic regressions suggest that among the current smokers in this plant, job and nonjob stress were positively associated with workers' intentions to participate in a worksite smoking cessation program. Thus, contrary to the popular notion that stress diminishes the motivation to quit, employees under high levels of stress may be most receptive to educational interventions intended to persuade smokers to commit to quitting. 相似文献