全文获取类型
收费全文 | 1330篇 |
免费 | 2篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 20篇 |
化学工业 | 52篇 |
金属工艺 | 21篇 |
机械仪表 | 24篇 |
建筑科学 | 2篇 |
矿业工程 | 6篇 |
能源动力 | 2篇 |
轻工业 | 5篇 |
水利工程 | 14篇 |
石油天然气 | 22篇 |
无线电 | 56篇 |
一般工业技术 | 137篇 |
冶金工业 | 902篇 |
原子能技术 | 53篇 |
自动化技术 | 17篇 |
出版年
2022年 | 6篇 |
2021年 | 9篇 |
2019年 | 8篇 |
2018年 | 19篇 |
2017年 | 15篇 |
2016年 | 19篇 |
2014年 | 18篇 |
2013年 | 22篇 |
2012年 | 13篇 |
2011年 | 19篇 |
2010年 | 12篇 |
2009年 | 16篇 |
2008年 | 18篇 |
2007年 | 18篇 |
2006年 | 10篇 |
2005年 | 8篇 |
2004年 | 10篇 |
2003年 | 11篇 |
2002年 | 7篇 |
2000年 | 6篇 |
1999年 | 16篇 |
1998年 | 180篇 |
1997年 | 128篇 |
1996年 | 101篇 |
1995年 | 61篇 |
1994年 | 62篇 |
1993年 | 51篇 |
1992年 | 18篇 |
1991年 | 11篇 |
1990年 | 11篇 |
1989年 | 5篇 |
1988年 | 9篇 |
1987年 | 13篇 |
1986年 | 5篇 |
1985年 | 5篇 |
1983年 | 10篇 |
1982年 | 10篇 |
1981年 | 21篇 |
1980年 | 25篇 |
1979年 | 5篇 |
1978年 | 9篇 |
1977年 | 103篇 |
1976年 | 133篇 |
1975年 | 8篇 |
1974年 | 7篇 |
1973年 | 7篇 |
1972年 | 6篇 |
1971年 | 5篇 |
1968年 | 4篇 |
1965年 | 4篇 |
排序方式: 共有1333条查询结果,搜索用时 0 毫秒
41.
IuG Suchkov IV Khudiakov EN Emel''ianenko MI Levi VI Pushkareva IIu Suchko VIu Litvin EV Kulesh RS Zotova AL Gintsburg 《Canadian Metallurgical Quarterly》1997,17(4):42-46
The purpose of this study was to find criteria characteristic for patients in need of care and social services. The criteria should serve as a guideline for patients and staff to facilitate care planning before discharge. The sample consisted of 49 patients, born before 1925, in need of emergency inpatient treatment, admitted to medical- or orthopaedic wards. Data of the patient's self care needs were collected by interviews, assessment of self care status and need of treatment. The patients could be divided into three groups depending on type of discharge. Group A (n = 27) discharged home, group B (n = 7) discharged to geriatric clinic and group C (n = 15) discharged and in need of further care and social services. Criteria indicating the patients further assistance from the community were in group C (medical- and orthopaedic wards) deficit in daily living activities and locomotion. Group B had an increased need of support from the physiotherapist and the occupational therapist, in locomotion as well as daily living activities The physician's assessment showed that the criteria behind the decision "no further medical treatment appropriate" and "ready for discharge" were not related to medical impairment but to lack of self care, need of care, rehabilitation and social services. 相似文献
42.
Nemanja Gavrilov Milica Vujkovi? Igor A. Pašti Gordana ?iri?-Marjanovi? Slavko V. Mentus 《Electrochimica acta》2011,(25):9197
The electrocatalytic activity of carbonized polyaniline nanostructures (Carb-nanoPANI) towards oxygen reduction reaction (ORR), estimated in 0.1 mol dm−3 KOH solution, was significantly improved upon a hydrothermal treatment in 1 mol dm−3 KOH solution. Namely, the onset of ORR was shifted by ∼70 mV to more positive potentials, and the number of electrons consumed per O2 molecule was enhanced in comparison to the original material. The number of electrons involved in ORR depended on loading, and with a loading of 0.5 mg cm−2, for the potentials lower than −0.5 V vs SCE, the number of electrons approached 4. For this material, high stability of electrochemical behavior and resistance to the poisoning by ethanol was evidenced by potentiodynamic cycling. 相似文献
43.
Zaripov Z. I. Burtsev S. A. Gavrilov A. V. Mukhamedzyanov G. Kh. 《Theoretical Foundations of Chemical Engineering》2002,36(4):400-405
The thermal-expansion coefficient and isobaric heat capacity c
p of n-hexane at 298.15–363.5 K and 0.098–147 MPa are measured by flux calorimetry. Observed and calculated c
p data are compared, and a general equation for determining c
p is suggested. 相似文献
44.
Nemanja M. Gavrilov Igor A. Pašti Jugoslav Krstić Miodrag Mitrić Gordana Ćirić-Marjanović Slavko Mentus 《Ceramics International》2013,39(8):8761-8765
Single phase tungsten carbide nanoparticles (WC-NPs), (mean particle diameter 5.4 nm), distributed over carbonized polyaniline (C-PANI) nanotubes/nanosheets were synthesized by a solid state reaction between WO3 and nitrogen-rich carbonized polyaniline at 1000 °C in a reducing atmosphere. The resulting composite was characterized by X-ray diffractometry, electron microscopy, thermogravimetry in oxidizing and reduction atmospheres and elemental analysis. We suggested that the synthesis of WC as a single phase was facilitated by reactive C atoms with dangling bonds, formed upon nitrogen removal. 相似文献
45.
Konstantin L. Gavrilov Stephen J. Bennison Kurt R. Mikeska Jan M. Chabala Riccardo Levi-Setti 《Journal of the American Ceramic Society》1999,82(4):1001-1008
Trace SiO2 and MgO additive distributions in sintered alumina have been studied using high-resolution scanning secondary ion mass spectrometry (SIMS). When doped with each additive individually, evidence is seen for both strong silicon segregation to grain boundaries ( C gb / C grain similar/congruent 300) in SiO2 -doped alumina and strong magnesium segregation to grain boundaries ( C gb / C grain similar/congruent 400) in MgO-doped alumina. When codoped with both SiO2 and MgO, segregation of both ions to grain boundaries is reduced by a factor of 5 or more over single doping. The additive concentrations increase proportionally in the grains, and both dopants become more uniformly distributed throughout the bulk. It is concluded that codoping with these additives increases their mutual bulk solid solubility and decreases their interfacial segregation over single doping. The beneficial effect of MgO additions in controlling microstructure development in alumina and improving corrosion resistance to aqueous HF stems from its ability to redistribute silicon ions from grain boundaries into the bulk. 相似文献
46.
M Feuerstein LM Burrell VI Miller A Lincoln GD Huang R Berger 《Canadian Metallurgical Quarterly》1999,35(3):232-245
Carpal tunnel syndrome (CTS) is a disorder frequently encountered by occupational health care specialists. The health care management of this disorder has involved a diverse set of clinical procedures. The present article is a review of the literature related to CTS with an emphasis on occupational-related CTS. MEDLINE, Cumulative Index to Nursing and Allied Health Literature, PsycLIT, and NIOSHTIC databases from 1985-1997 were searched for treatment outcome studies related to CTS. Treatments of interest included surgery, physical therapy, drug therapy, chiropractic treatment, biobehavioral interventions, and occupational rehabilitation. A systematic review of the effects of these interventions on symptoms, medical status, function, return to work, psychological well-being, and patient satisfaction was completed. Compared to other treatments, the majority of studies assessed the effects of surgical interventions. Endoscopic release was associated with higher levels of physical functioning and fewer days to return to work when compared to open release. Limited evidence indicated: 1) steroid injections and oral use of B6 were associated with pain reduction; 2) in comparison to splinting, range of motion exercises appeared to be associated with less pain and fewer days to return to work; 3) cognitive behavior therapy yielded reductions in pain, anxiety, and depression; and, 4) multidisciplinary occupational rehabilitation was associated with a higher percentage of chronic cases returning to work than usual care. Workers' compensation status was associated with increased time to return to work following surgery. Conclusions are preliminary due to the small number of well-controlled studies, variability in duration of symptoms and disability, and the broad range of reported outcome measures. While there are several opinions regarding effective treatment, there is very little scientific support for the range of options currently used in practice. Despite the emerging evidence of the multivariate nature of CTS, the majority of outcome studies have focused on single interventions directed at individual etiological factors or symptoms and functional limitations secondary to CTS. 相似文献
47.
V. A. Atoyan A. A. Bolberov G. A. Bragin B. K. Bylkin S. D. Gavrilov A. A. Dovbenko A. L. Egorov V. A. Elin I. A. Engovatov V. A. Kazakov N. V. Kafel'nikova A. S. Kornitskii V. A. Kremnev A. V. Kudryavtseva V. V. Lysenko E. S. Matusevich V. P. Mashkovich A. I. Musorin V. A. Neretin V. G. Nersesyan S. G. Tsypin V. A. Cherkashin Yu. V. Shirokov 《Atomic Energy》1992,72(4):309-316
Moscow Physics Research Institute. State Atomic Inspectorate Scientific Center. Moscow Special Research Institute. Armenian Nuclear Power Station. Institute for Atomic Energy. Dekom Cooperative. All-Union Nuclear Materials Research Institute. Gidropress Special Designs Office. Translated from Atomnaya Énergiya, Vol. 72, No. 4, pp. 345–353, April, 1992. 相似文献
48.
49.
50.