全文获取类型
收费全文 | 1782篇 |
免费 | 1篇 |
专业分类
电工技术 | 6篇 |
化学工业 | 30篇 |
金属工艺 | 8篇 |
机械仪表 | 7篇 |
建筑科学 | 3篇 |
矿业工程 | 11篇 |
轻工业 | 5篇 |
水利工程 | 3篇 |
石油天然气 | 10篇 |
无线电 | 13篇 |
一般工业技术 | 105篇 |
冶金工业 | 1573篇 |
原子能技术 | 5篇 |
自动化技术 | 4篇 |
出版年
2022年 | 2篇 |
2018年 | 6篇 |
2017年 | 10篇 |
2016年 | 7篇 |
2015年 | 5篇 |
2014年 | 4篇 |
2013年 | 11篇 |
2012年 | 10篇 |
2011年 | 6篇 |
2010年 | 8篇 |
2009年 | 13篇 |
2008年 | 4篇 |
2007年 | 8篇 |
2006年 | 6篇 |
2005年 | 7篇 |
2004年 | 6篇 |
2003年 | 8篇 |
2001年 | 7篇 |
2000年 | 7篇 |
1999年 | 29篇 |
1998年 | 413篇 |
1997年 | 257篇 |
1996年 | 172篇 |
1995年 | 98篇 |
1994年 | 76篇 |
1993年 | 104篇 |
1992年 | 11篇 |
1991年 | 15篇 |
1990年 | 10篇 |
1989年 | 9篇 |
1988年 | 11篇 |
1987年 | 10篇 |
1986年 | 10篇 |
1985年 | 8篇 |
1984年 | 3篇 |
1983年 | 7篇 |
1982年 | 15篇 |
1981年 | 27篇 |
1980年 | 31篇 |
1979年 | 11篇 |
1978年 | 7篇 |
1977年 | 97篇 |
1976年 | 187篇 |
1975年 | 8篇 |
1973年 | 3篇 |
1969年 | 2篇 |
1968年 | 3篇 |
1967年 | 4篇 |
1963年 | 1篇 |
1955年 | 1篇 |
排序方式: 共有1783条查询结果,搜索用时 62 毫秒
101.
More than 600 cases of ovarian tumors were analyzed for histological type, age of patient, bilateral occurrence, mobility and malignant degeneration in restant ovaries. Tumors of germinal epithelial origin show the highest incidence (24%) of malignant degeneration, tumors of germ cells the lowest (3,5%). Incidence of malignant degeneration increases in relation to the age of the patient from 2% (and under 30 years) to 36,5% (60-70 years). Each form of tumor has its typical age peak, which is about 20 years higher for carcinomas than for their benign counterpart. Bilateral ovarian tumors are malignant in 29%, one-sided only in 13%. Among freely movable ovarian tumors, only 6% enclose a malignant tumor, among adhaerent ones 34%. The examination of the prognosis of granulosacell-tumors, dysgerminomas and teratoblastomas is based on a larger material. 相似文献
102.
A reduction of red cell SA in patients following acute myocardial infarction is reported and the effects of SA-depleted red cells on cardiac index and alveolar capillary blood flow in the dog are described. The mean red cell SA in 26 patients following acute myocardial infarction was 0.021 +/- 0.001 compared with a mean of 0.031 +/- 0.002 mumol./0.1 ml RBC in 12 normal subjects (p less than 0.01). In five dogs injected with neuraminidase, an enzyme which removes SA from the red cell membrane, a 43% decrease in mean cardiac index from 2.3 +/- 0.22 to 1.3 +/- 0.16 (p less than 0.01) occurred. In films of the pulmonary microcircuation the mean widths of typical alveolar capillary beds decreased 42.6% +/- 5% (p less than 0.01). In three other dogs, autotransfusion with SA-depleted stored blood resulted in a 25% decrease in mean cardiac index from 2.0 +/- 0.21 to 1.5 +/- 0.21 (p less than 0.2), and a 21.7% +/- 0.9% (p less than 0.01) decrease in mean widths of typical alveolar capillary beds. We conclude that a reduction of red cell SA follows acute myocardial infarction and that SA-depleted red cells decrease cardiac index and alveolar capillary blood flow in the dogs. 相似文献
103.
104.
105.
106.
LS Cherkasova GG Vereshchako TM Mironova VA Novik MIu Ta?ts GF Tsykhun VG Fomichenko 《Canadian Metallurgical Quarterly》1977,49(4):15-18
Intensity of glycolysis was studied under conditions of immobilization stress and adrenalectomy as well as with administration of adrenaline and hydrocortisone. The processes of aerobic glycolysis, activity of enzymes of the tricarboxylic acid cycle and mitochondria respiratory chain, content of total, free and protein-bound glycogen, glucose-I-phosphate, glucose-6-phosphate, pyruvate, alpha-ketoglutarate, cytrate and macroergs in the brain are shown to depend on the level of adrenal hormones producing a multilateral effect on a series of energy metabolism links. 相似文献
107.
II Gitel'zon VP Nefedov VV Mezhevikin VA Samo?lov IuV Kotlovski? 《Canadian Metallurgical Quarterly》1977,84(7):23-24
Hypoxemia (45-minute) influence in vivo on erythropoietic activity of the kidney, liver, spleen, and sternum was studied by normoxemic perfusion of the isolated organs. The erythropoietic activity proved to increase after 6-hour perfusion of the liver; this confirmed the participation of this organ in the extrarenal secretion of the erythropoietic factor. 相似文献
108.
109.
OBJECTIVE: The authors examined the efficacy of intramuscular flunitrazepam compared with intramuscular haloperidol for the immediate control of agitated or aggressive behavior in acutely psychotic patients. METHOD: Twenty-eight actively psychotic inpatients, aged 20-60 years, who were under treatment with neuroleptic agents were selected for the study. Each was randomly assigned on a double-blind basis to receive either 5 mg i.m. of haloperidol (N=13) or 1 mg i.m. of flunitrazepam (N=15) during an aggressive event. Verbal and physical aggression was measured over time with the Overt Aggression Scale. Patients were also rated with the Brief Psychiatric Rating Scale and the Clinical Global Impression scale. RESULTS: Both flunitrazepam and haloperidol exhibited acute antiaggressive activity. This beneficial effect, as assessed by the Overt Aggression Scale, was obtained within 30 minutes. CONCLUSIONS: Intramuscular flunitrazepam may serve as a convenient, rapid, safe, and effective adjunct to neuroleptics in reducing aggressive behavior in emergency psychiatric settings. 相似文献
110.
We report the results of studies of the new measurement standards GÉT 160-00. The primary standard is to be used to reproduce and transfer the size of the unit of electromagnetic energy flux in the frequency range 0.3–78 GHz. 相似文献