全文获取类型
收费全文 | 3400篇 |
免费 | 80篇 |
国内免费 | 10篇 |
专业分类
电工技术 | 44篇 |
综合类 | 1篇 |
化学工业 | 707篇 |
金属工艺 | 58篇 |
机械仪表 | 59篇 |
建筑科学 | 49篇 |
矿业工程 | 4篇 |
能源动力 | 91篇 |
轻工业 | 201篇 |
水利工程 | 12篇 |
石油天然气 | 7篇 |
无线电 | 299篇 |
一般工业技术 | 525篇 |
冶金工业 | 1110篇 |
原子能技术 | 27篇 |
自动化技术 | 296篇 |
出版年
2023年 | 27篇 |
2022年 | 61篇 |
2021年 | 76篇 |
2020年 | 70篇 |
2019年 | 65篇 |
2018年 | 85篇 |
2017年 | 60篇 |
2016年 | 62篇 |
2015年 | 57篇 |
2014年 | 78篇 |
2013年 | 174篇 |
2012年 | 105篇 |
2011年 | 108篇 |
2010年 | 75篇 |
2009年 | 87篇 |
2008年 | 84篇 |
2007年 | 74篇 |
2006年 | 83篇 |
2005年 | 58篇 |
2004年 | 43篇 |
2003年 | 45篇 |
2002年 | 45篇 |
2001年 | 22篇 |
2000年 | 41篇 |
1999年 | 71篇 |
1998年 | 355篇 |
1997年 | 225篇 |
1996年 | 162篇 |
1995年 | 96篇 |
1994年 | 83篇 |
1993年 | 81篇 |
1992年 | 45篇 |
1991年 | 34篇 |
1990年 | 24篇 |
1989年 | 46篇 |
1988年 | 39篇 |
1987年 | 31篇 |
1986年 | 29篇 |
1985年 | 24篇 |
1984年 | 20篇 |
1983年 | 20篇 |
1982年 | 34篇 |
1981年 | 34篇 |
1980年 | 37篇 |
1979年 | 21篇 |
1978年 | 20篇 |
1977年 | 56篇 |
1976年 | 113篇 |
1974年 | 15篇 |
1973年 | 24篇 |
排序方式: 共有3490条查询结果,搜索用时 15 毫秒
21.
OBJECTIVES: Injury is the leading cause of death in the male working population of Brazil. An important fraction of these deaths are work related. Very few cohort studies of steel workers, and none from developing countries, have reported on mortality from injuries. This paper analyses mortality from work and non-work related injuries among Brazilian steel workers. METHODS: Deaths during employment from 1 January 1977 to 30 November 1992 were analysed in a cohort of 21,816 male steel workers. Mortality rates specific for age and calendar year among the workers were compared with those of the male population of the state where the plant is located. Work related injuries were analysed by comparing the mortality rates for different subgroups of the cohort. RESULTS: The number of deaths (391) was less than half that expected based on death rates of the general population. Over 60% (242) of deaths were due to injuries. Mortality from most causes was substantially below that in the general population, but that from unintentional injury, was 50% above that of the general population. Standardised mortality ratios (SMRs) were highest for the youngest and the oldest employees and for labourers and clerical workers. Mortality from motor vehicle injury was twice that expected from population rates (SMR = 209, 95% confidence interval (95% CI) 176-244). There was a 67% fall in the age adjusted mortality from occupational injuries in the study period. CONCLUSION: The healthy worker effect in this cohort was greater than that commonly found in studies of occupational groups in developed countries, probably because of a greater socioeconomic gap between employed and unemployed populations in Brazil, and unequal distribution of health care resources. Mortality was especially high for motor vehicle injuries. The fall in mortality from occupational injuries during the study period was probably due to improvement in safety standards, increased automation, and better medical care. There is a need to investigate risk factors for unintentional injuries among steel workers, especially those due to motor vehicle injuries. Prevention of occupational and nonoccupational injuries should be a main priority in Brazil. 相似文献
22.
Sodium alginate was graft-copolymerized with ethyl acrylate using ceric ammonium nitrate as an initiator. In order to optimize the conditions for grafting, the concentrations of nitric acid, initiator and monomer together with temperature, time and amount of substrate were varied. The kinetic scheme of free radical graft copolymerization has been proposed and the equations relating the values of rate of polymerization, rate of graft copolymerization and rate of homopolymerization are also suggested. The experimental results agree very well with the proposed kinetic scheme. 相似文献
23.
GV Naccarelli DL Wolbrette JT Dell'Orfano HM Patel JC Luck 《Canadian Metallurgical Quarterly》1998,9(8):864-891
Multiple trials using antiarrhythmic drugs, pharmacologic therapy, and implantable cardioverter defibrillators have been performed in an attempt to improve survival in patients: (1) postmyocardial infarction; (2) with congestive heart failure, with and without nonsustained ventricular tachycardia; and (3) with sustained ventricular tachycardia and those who have survived an out-of-hospital cardiac arrest. This article reviews some of the key findings and limitations of completed and ongoing trials. We also make recommendations for the current treatment of such patients based on the results of these trials. 相似文献
24.
IA Bukaeva NT Ra?khlin NA Probatova EA Smirnova NN Tupitsyn EN Sholokhova R Gossrau 《Canadian Metallurgical Quarterly》1997,59(4):31-38
26 cases of lymphoproliferative diseases were studied: 8 cases of reactive follicular hyperplasia (RFH), 11 cases of non-Hodgkin's malignant lymphomas (NML), 7 cases of lymphogranulomatosis (LGM). Only gamma-glutamyl transpeptidase (GGT) was found in lymphoid cells of B- and T-dependent areas of lymph nodes with reactive changes as well as in tumor cells of NML and LGM. GGT activity was more pronounced in NML of high-grade malignancy (centroblast and immunoblast) as compared to lymphomas of lower grade of malignancy (lymphocytic, centroblast-centrocytic and in Lennert lymphoma). GGT activity in cells of Hodgkin and Berezovsky-Sterberg in some cases of LGM was high, in others low. Significant differences in GGT activity between RFH and follicular centroblast-centrocytic lymphoma were not found. Activity of aminopeptidase M was observed in histiocytes, fibroblasts, vessels and areas of connective tissue growth. Aminopeptidase A activity was observed in vessels only. Activity of dipeptidyl(amino)peptidase IV was observed in some lymphoid cells in RFH, NML and LGM. Thus, GGT activity may be considered as a differential-diagnostic marker in separating NML of high and low degree of malignancy and this may presume a different sensitivity to the therapy. 相似文献
25.
26.
27.
M Patel RF Kaltenbach DA Nugiel RJ McHugh PK Jadhav LT Bacheler BC Cordova RM Klabe S Erickson-Viitanen S Garber C Reid SP Seitz 《Canadian Metallurgical Quarterly》1998,8(9):1077-1082
Cyclic urea SD146, a potent HIV protease inhibitor bearing a flat resistance profile, possessed poor solubility and bioavailability, which precluded further development of the compound. In an effort to improve upon the pharmacokinetic profile of the compound, several analogs modified at the P1/P1' residues were prepared and evaluated. Several of those compounds displayed significant improvement of physical properties. 相似文献
28.
RI Senderoff KM Kontor L Kreilgaard JJ Chang S Patel J Krakover JK Heffernan LB Snell GB Rosenberg 《Canadian Metallurgical Quarterly》1998,87(2):183-189
This article summarizes the results of a combined analysis from two identical multicenter clinical trials that investigated the efficacy and safety of sertraline versus placebo for treating panic disorder. Patients with panic disorder who were treated with sertraline had a statistically significant reduction in the mean number of panic attacks per week (the primary efficacy measure) as compared with placebo (4.8 vs. 2.5, p < .001). Sertraline-treated patients also showed greater improvement that was statistically significant on several ratings of panic disorder symptomatology and functioning. The design characteristics, clinical rating measures, and outcome measures in these trials included most of the features deemed essential by Shear and Maser (1994) in their summary of the NIMH Consensus Conference for the development of standardized assessments for panic disorder. This suggests that the NIMH Consensus Conference played a key role in developing successful multicenter pharmacological treatment studies, such as this one that ultimately demonstrated that sertraline was an effective treatment for panic disorder. 相似文献
29.
M Cuchacovich NN Tchernitchin H Gatica R Wurgaft L Contreras AN Tchernitchin 《Canadian Metallurgical Quarterly》1996,124(2):160-169
BACKGROUND: The target cellular response to glucocorticoids is proportional to the concentrations or affinity of specific receptors to these substances. AIM: To look for a correlation between glucocorticoid receptor concentrations in synovial wall cells and the clinical response to steroidal treatment in patients with rheumatoid arthritis. PATIENTS AND METHODS: Twenty eight patients with rheumatoid arthritis were studied. Each subject was subjected to a synovial biopsy, in which a dry radioautographic technique for diffusible compounds was used. Patients were treated afterwards with three 500 mg intravenous pulses of methilprednisolone. RESULTS: A mean of 44.8% of synovial cells (range 30.1-62.8%) had binding sites for 3H dexamethasone. All patients had a significant clinical improvement after methylprednisolone. Multiple regression analysis did not show a correlation between clinical response and glucocorticoid receptor concentration. CONCLUSIONS: The lack of association between glucocorticoid receptor concentrations and clinical response could be due to the large steroid dose used, that saturated all available receptors. 相似文献
30.
Production of alumina fibre through jute fibre substrate 总被引:1,自引:0,他引:1
Alumina fibre has been produced using jute fibre as substrate material at temperatures lower than 1600 C in a reducing atmosphere. Processed jute fibre was chemically pretreated by saturation with Al2Cl6 · 12H2O, coked and then pyrolysed to obtain alumina fibre. Chemical pretreatment conditions have been determined by following weight loss measurements of the jute fibre at 0.1 to 0.6 N solutions of NaOH, KOH, NH4OH, Na2CO3, K2CO3, HCl and acetic acid. The effect of heat treatment on the jute fibre and jute fibre + aluminium salt has been studied from 150 to 1600 C. Trace elements present (Fe2O3, SiO2, K2O, Na2O, CaO, MgO, ZnO, MnO, V2O5, P2O5, CuO) on heat-treated products have been determined by atomic absorption spectrometry. Optical and scanning electron micrographs of representative samples showing growth mechanism are presented. The effect of copper, nickel and platinum catalysts and fluxing agents such as K2O and Na2O in fibre formation has also been examined. Particle size and surface area analyses of intermediate and final products have been carried out. Changes in 2 values are plotted for various products from X-ray diffraction studies. It is conceived that the porous surface of cellulosic fibrils in the jute fibre adsorbs the AlCl3 molecules which decompose to oxide and are gradually shaped to the fibrous form during the course of thermal treatment in a reducing atmosphere and due to the high surface area. 相似文献