全文获取类型
收费全文 | 758803篇 |
免费 | 11844篇 |
国内免费 | 2769篇 |
学科分类
工业技术 | 773416篇 |
出版年
2021年 | 7824篇 |
2020年 | 5657篇 |
2019年 | 7145篇 |
2018年 | 11876篇 |
2017年 | 11969篇 |
2016年 | 12658篇 |
2015年 | 8604篇 |
2014年 | 13944篇 |
2013年 | 35417篇 |
2012年 | 21970篇 |
2011年 | 29347篇 |
2010年 | 23418篇 |
2009年 | 25700篇 |
2008年 | 26346篇 |
2007年 | 26157篇 |
2006年 | 22802篇 |
2005年 | 20463篇 |
2004年 | 19096篇 |
2003年 | 18488篇 |
2002年 | 17994篇 |
2001年 | 17568篇 |
2000年 | 16590篇 |
1999年 | 16344篇 |
1998年 | 38117篇 |
1997年 | 27627篇 |
1996年 | 21385篇 |
1995年 | 16276篇 |
1994年 | 14660篇 |
1993年 | 14271篇 |
1992年 | 10979篇 |
1991年 | 10654篇 |
1990年 | 10573篇 |
1989年 | 10277篇 |
1988年 | 9747篇 |
1987年 | 8727篇 |
1986年 | 8569篇 |
1985年 | 9729篇 |
1984年 | 8960篇 |
1983年 | 8432篇 |
1982年 | 7617篇 |
1981年 | 7848篇 |
1980年 | 7396篇 |
1979年 | 7597篇 |
1978年 | 7441篇 |
1977年 | 8157篇 |
1976年 | 10383篇 |
1975年 | 6709篇 |
1974年 | 6394篇 |
1973年 | 6466篇 |
1972年 | 5504篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
A critical review of the current status of tungsten resources, of state-of-the-art processing technology and of product development
in India vis-a-vis the world scenario is presented. An attempt has been made to identify technology gap areas requiring attention. 相似文献
992.
This article describes the phenomenon of morphological instability in solid-solid phase transformations during thin-film interdiffusion,
specifically related to the initial stages of precipitation when phase growth occurs along the interface between thin films.
The experimental observations that revealed this effect will be presented, and a working hypothesis will be discussed. Experimental
observations suggest that the ledge mechanism of growth is present in this system but does not inhibit the formation of interfacial
instabilities. It is proposed that morphological stability for solid-phase growth occurring during thin-film interdiffusion
can be treated by the inclusion of a solute-source term into the two-dimensional perturbation approach generally used to study
unstable growth morphologies. Experimental observations that provide qualitative and semiquantitative support for the solute-source
model are also presented. 相似文献
993.
OBJECTIVE: To determine the role of synovial fluid (SF) compared to peripheral blood (PB) CD45RO+ T cells in patients with reactive arthritis (ReA) and undifferentiated oligoarthritis. METHODS: We examined SF and PB of 8 patients with a specific lymphocyte proliferation to Yersinia enterocolitica (n = 5) and Chlamydia trachomatis (n = 3). After depletion of the CD45RA+ T cell subset by dynabeads, the remaining T cells (> 95% CD45RO+) from PB and SF of these patients were again stimulated with these bacterial antigens. RESULTS: The mean stimulation index (SI) of these 8 patients with ReA (n = 5) and undifferentiated oligoarthritis (n = 3) was 30.3 +/- 21.86 in SF compared to 1.36 +/- 0.75 in PB. The enrichment of CD45RO+ cells influenced the antigen specific proliferative response of T cells neither in PB (SI = 1.75 +/- 1.35) nor in SF (26.1 +/- 24.05); the initial difference remained unchanged. CONCLUSION: Our findings suggest that the antigen specific lymphocyte proliferation obtained with SF cells is not due to abundance of nonspecific CD45RO+ T cells but can rather be taken as an indication of specific recognition of local bacterial antigens in ReA. 相似文献
994.
N Haddad R Ben Khelifa H Matter H Kharmachi MF Aubert A Wandeler J Blancou 《Canadian Metallurgical Quarterly》1994,12(4):307-309
The possibility of immunizing dogs orally against rabies, using SADBern, an attenuated strain, was tested on dogs in the field in Tunisia. This strain induced high neutralizing antibody titres and conferred to all vaccinated dogs total resistance against a challenge with a Maghrebian strain. However, an excretion of virus of vaccinal origin was observed in one dog, hampering the use of SADBern in dogs. Nevertheless, this work demonstrates for the first time that dogs in developing countries, especially those which are inaccessible to parenteral vaccination, could be efficiently immunized against rabies by the oral route. 相似文献
995.
L Giorgi A Di Filippo A Franchini L Rizzo S Benvenuti M Conti GP Novelli 《Canadian Metallurgical Quarterly》1994,60(1-2):43-47
OBJECTIVE: The reflex response to orotracheal intubation provokes an increase of arterial pressure accompanied by an increase of chorioides volume and a consequent ocular hypertone. There are several methods to reduce the reflex response due to intubation. One of the most effective is topical anaesthesia of larynx and trachea. Experiments were directed to evaluate the efficacy of topical anaesthesia to reduce the intraocular hypertone due to orotracheal intubation. DESIGN: A prospective randomized mask study was conduct on patients undergoing ophthalmologic (anterior segment) surgery at the Eye Clinic of Florence University. METHODS: Intraocular pressure was measured by a Goldman tonometer at four times: T0 = basal, T1 = 2' minutes after induction of general anaesthesia, T2 = 2' minutes after laryngoscopy, T3 = 2' minutes after orotracheal intubation. At the same moments, systolic blood pressure, heart rate, rate pressure pro duct were measured. Patients were randomly divided in two groups: Group L (n = 10) in which was evaluated the efficacy of laryngotracheal topical spray of lidocaine 4% (2 ml) and Group F (n = 10) in which saline was used instead of anesthetic. The filling of the LTA kit (Abbott) was made by a person not involved in the experiments. DATA ANALYSIS: Student's t test for unpaired data. RESULTS: Topical anaesthesia reduces the increase of intraocular pressure, hypertension and rate pressure product due to intubation. The intraocular pressure reduces to 13% less than basal value in Group L and increase to 50% more than basal value in Group F. CONCLUSION: The topical anaesthesia of larynx and trachea is effective to reduce the intraocular hypertension due to the reflex response evoked by orotracheal intubation. 相似文献
996.
997.
Translated from Izmeritel'naya Tekhnika, No. 3, pp. 57–58, March, 1993. 相似文献
998.
Comments on the argument of L. T. Hoshmand and D. E. Polkinghorn (see record 1992-21300-001) that psychological practice should inform science to the same degree that science informs practice. Based on a survey of 121 faculty members in programs accredited by the American Psychological Association, 65% reported practice activity. The authors agree that the problem involves a much more complex integrative task that goes beyond simply recognizing knowledge gained in practice settings as valid. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
999.
Lewis Gloria J.; Greenburg Sharon L.; Hatch David B. 《Canadian Metallurgical Quarterly》1988,19(1):81
We report the results of the first national survey of psychologists in private practice regarding their participation in peer consultation groups. The sample (71% return) was drawn from 800 randomly selected psychologists listed in the National Register of Health Service Providers in Psychology. We found that 23% of the sample currently belonged to peer consultation groups, and 24% had belonged in the past. Of those not currently in groups, 61% expressed the desire to belong if one were available. There were virtually no significant demographic differences between current members and nonmembers. We examined the following group characteristics: formation, length of existence, size, membership, leadership, theoretical orientation, range of experience, time and place, content, and group process. Groups tended to be small, informal, and leaderless; however, we found great variation among groups on all dimensions. Findings also showed a high degree of satisfaction with membership. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
1000.
Zhengmao Ye Campbell J.C. Zhonghui Chen Eui-Tae Kim Madhukar A. 《Quantum Electronics, IEEE Journal of》2002,38(9):1234-1237
An InAs/AlGaAs quantum-dot infrared photodetector based on bound-to-bound intraband transitions in undoped InAs quantum dots is reported. AlGaAs blocking layers were employed to achieve low dark current. The photoresponse peaked at 6.2 /spl mu/m. At 77 K and -0.7 V bias, the responsivity was 14 mA/W and the detectivity, D*, was 10/sup 10/ cm/spl middot/Hz/sup 1/2//W. 相似文献