全文获取类型
收费全文 | 3637篇 |
免费 | 11篇 |
专业分类
电工技术 | 5篇 |
综合类 | 2篇 |
化学工业 | 93篇 |
金属工艺 | 1篇 |
机械仪表 | 4篇 |
建筑科学 | 20篇 |
矿业工程 | 1篇 |
能源动力 | 2篇 |
轻工业 | 14篇 |
无线电 | 10篇 |
一般工业技术 | 29篇 |
冶金工业 | 3449篇 |
原子能技术 | 1篇 |
自动化技术 | 17篇 |
出版年
2023年 | 2篇 |
2021年 | 2篇 |
2020年 | 2篇 |
2018年 | 2篇 |
2017年 | 6篇 |
2016年 | 3篇 |
2015年 | 6篇 |
2014年 | 3篇 |
2013年 | 48篇 |
2012年 | 2篇 |
2011年 | 4篇 |
2010年 | 5篇 |
2009年 | 5篇 |
2008年 | 4篇 |
2006年 | 8篇 |
2005年 | 11篇 |
2004年 | 4篇 |
2003年 | 11篇 |
2002年 | 7篇 |
2000年 | 3篇 |
1999年 | 109篇 |
1998年 | 1019篇 |
1997年 | 611篇 |
1996年 | 388篇 |
1995年 | 245篇 |
1994年 | 182篇 |
1993年 | 219篇 |
1992年 | 37篇 |
1991年 | 67篇 |
1990年 | 51篇 |
1989年 | 64篇 |
1988年 | 62篇 |
1987年 | 46篇 |
1986年 | 36篇 |
1985年 | 38篇 |
1983年 | 8篇 |
1982年 | 21篇 |
1981年 | 16篇 |
1980年 | 23篇 |
1979年 | 6篇 |
1978年 | 6篇 |
1977年 | 95篇 |
1976年 | 141篇 |
1975年 | 5篇 |
1974年 | 2篇 |
1968年 | 1篇 |
1963年 | 1篇 |
1961年 | 4篇 |
1955年 | 1篇 |
1954年 | 1篇 |
排序方式: 共有3648条查询结果,搜索用时 15 毫秒
991.
Colson Donald B.; Horwitz Leonard; Allen Jon G.; Frieswyk Siebolt H.; Gabbard Glen O.; Newsom Gavin E.; Coyne Lolafaye 《Canadian Metallurgical Quarterly》1988,5(3):259
In this article we show that a focus on patient collaboration, as a marker for the therapeutic alliance, is advantageous not only for theory and research but also for clinical practice. This point of view in no way minimizes the importance of the therapist's activity or the clinical significance of the interaction between patient and therapist. Rather, it focuses attention on how the therapist's personality, skill, and technique interact with the problems the patient brings to psychotherapy. (PsycINFO Database Record (c) 2011 APA, all rights reserved) 相似文献
992.
993.
994.
995.
996.
The effect of intraventricular atrial natriuretic peptide (ANP) on elevated intracranial pressure (ICP) was evaluated in a rodent model of global ischemia and reperfusion. ANP administration into the lateral ventricle 30 minutes after reperfusion statistically significantly reduced ICP compared with both vehicle treated animals (p < 0.001) and pretreatment pressures (p < 0.001). The ICP effects of ANP did not coincide with specific changes in regional perfusion parameters measured by laser-Doppler flowmetry. Two different vehicles for ANP were used to verify that the changes in ICP observed were independent of the sodium content administered in the vehicle. Based on the reductions observed in ICP, ANP deserves further evaluation as a treatment modality for the acute elevations in ICP associated with ischemic brain injury. 相似文献
997.
Y Ilan P Attavar M Takahashi A Davidson MS Horwitz J Guida NR Chowdhury JR Chowdhury 《Canadian Metallurgical Quarterly》1996,98(11):2640-2647
Recombinant adenoviruses are highly efficient at transferring foreign genes in vivo. However, duration of gene expression is limited by the host antiviral immune response which precludes expression upon viral readministration. We tested the feasibility of prolonging gene expression by induction of central tolerance to adenoviral antigens in bilirubin-UDP-glucuronosyltransferase-1 (BUGT1)-deficient Gunn rats. Tolerance was induced by intraperitoneal injection of antilymphocyte serum, followed by intrathymic inoculation of one of the following: a recombinant adenovirus (Ad), adenovirus human UDP-glucuronosyltransferase (Ad-hBUGT1) carrying the hBUGT1 gene; a protein extract of the same virus; or viral infected hepatocytes. Controls received intrathymic injections of normal saline. After 12 d all groups were injected intravenously with 5 x 10(9) pfu of either Ad-hBUGT1 or adenovirus beta-galactosidase (Ad-LacZ) (expressing the Escherichia coli beta-galactosidase [LacZ] gene). In all three groups of tolerized rats, hBUGT1 was expressed in the liver after administration of Ad-hBUGT1, with glucuronidation of biliary bilirubin of above 95%. Serum bilirubin levels decreased from 7.2 to 1.8 mg/dl within 1 wk and remained low for 7 wk. Similar findings were observed following repeat injections given on days 45 and 112. In control rats serum bilirubin levels were reduced for only 4 wk, and viral readministration was ineffective. In all tolerized groups, but not in controls, there was a marked inhibition of appearance of neutralizing antibodies and cytotoxic lymphocytes against the recombinant adenovirus. Injection of wild type adenovirus-5 (Ad5) into the tolerized rats elicited a wild type-specific cytotoxic lymphocyte response. This is the first demonstration of Ad-directed long-term correction of an inherited metabolic disease following central tolerization with thymic antigen. 相似文献
998.
999.
1000.
C Deschamps VF Trastek MS Allen PC Pairolero JO Johnson DR Larson 《Canadian Metallurgical Quarterly》1997,113(3):545-50; discussion 550-1
From January 1960 to June 1995, 185 patients underwent reoperation without esophageal resection for symptoms of recurrent gastroesophageal reflux disease. There were 102 men and 83 women. Median age was 58 years (range 20 to 84 years). A single previous antireflux operation had been performed in 147 patients, two in 33, and three in 5. The median interval between the reoperation and the previous operation was 36 months (range 1 to 291 months). Indications for reoperation were symptoms in 184 patients and a large paraesophageal hernia in one patients. The surgical approach was by means of a thoracotomy in 133 patients (71.9%), laparotomy in 27 (14.6%), and a thoracoabdominal incision in 25 (13.5%). A Nissen fundoplication was performed in 107 patients (57.8%), Belsey fundoplication in 47 (25.4%), truncal vagotomy and antrectomy with Roux-en-Y reconstruction in 17 (9.2%), anatomic hernia repair in 12 (6.5%), and Hill gastropexy in 2 (1.1%). A Collis gastroplasty was added to the fundoplication in 116 patients (62.7%), and a pyloroplasty was performed in 17 (9.2%). There was one operative death (0.5%). Complications occurred in 47 patients (25.4%). Median postoperative hospitalization was 9 days (range 5 to 58 days). Follow-up was complete in 156 patients (84.3%) and ranged from 3 to 283 months (median 44 months). Improvement occurred in 137 patients (87.8%). Functional results were classified as excellent in 65 patients (41.6%), good in 29 (18.6%), fair in 43 (27.6%), and poor in 19 (12.2%). No single operative approach or procedure proved to be functionally superior. We conclude that reoperation with esophageal preservation after a failed antireflux procedure will result in significant functional benefit and can be performed with low mortality and acceptable morbidity. The type of repair should be tailored to the individual patient. 相似文献