全文获取类型
收费全文 | 707篇 |
免费 | 0篇 |
专业分类
化学工业 | 7篇 |
建筑科学 | 1篇 |
轻工业 | 1篇 |
石油天然气 | 1篇 |
一般工业技术 | 1篇 |
冶金工业 | 694篇 |
自动化技术 | 2篇 |
出版年
2013年 | 1篇 |
2012年 | 1篇 |
2010年 | 1篇 |
2009年 | 1篇 |
2008年 | 1篇 |
2006年 | 2篇 |
2005年 | 2篇 |
2000年 | 1篇 |
1999年 | 20篇 |
1998年 | 197篇 |
1997年 | 110篇 |
1996年 | 63篇 |
1995年 | 35篇 |
1994年 | 47篇 |
1993年 | 32篇 |
1992年 | 5篇 |
1991年 | 11篇 |
1990年 | 6篇 |
1989年 | 15篇 |
1988年 | 12篇 |
1987年 | 6篇 |
1986年 | 4篇 |
1985年 | 3篇 |
1983年 | 5篇 |
1982年 | 2篇 |
1981年 | 6篇 |
1980年 | 15篇 |
1979年 | 1篇 |
1978年 | 4篇 |
1977年 | 28篇 |
1976年 | 66篇 |
1975年 | 2篇 |
1974年 | 1篇 |
1955年 | 1篇 |
排序方式: 共有707条查询结果,搜索用时 0 毫秒
101.
The authors present clinical and case material on two male triplets with aberrant gender identity. Their findings coincide with those of the few family studies reported in which there were two or more transsexual members; they also reveal patterns generally in keeping with the psychological determinants of transsexualism suggested by Stoller. 相似文献
102.
Since it covers the lateral wall of the mastoid air system, the suprameatal triangle is of importance to otologic surgeons during mastoidectomy. Because of this clinical importance, topographic anatomy of the suprameatal spine and depression was studied on Anatolian skulls. In all, 363 male and 231 female skulls were studied. The most prevalent type of suprameatal spine resembled a crest and was found in both sexes on the right (77.6%) and left (80%) sides. The absence of a suprameatal depression was significantly higher in females (right 9.1%; left 8.7%) than in males (right 1.7%; left 2.5%). Suprameatal depressions were mostly shallow in female subjects, but were mostly observed in males to be at a medium depth or deep. 相似文献
103.
104.
105.
106.
ES Flamm HB Demopoulos ML Seligman JJ Tomasula V De Crescito J Ransohoff 《Canadian Metallurgical Quarterly》1977,46(3):328-335
Two models have been used to study the effects of ethanol on injuries of the central nervous system. The spinal cords of cats were injured by delivering a 200 gm-cm impact to the exposed dura mater. A second group of animals received a similar injury to the exposed dura mater overlying the cerebral hemispheres. The animals were divided into two groups, those that received an infusion of ethanol before injury, and control animals that received no ethanol. The parameters of injury used in this model produced small and insignificant lesions in those animals that received no ethanol; however, when the animals were pretreated with ethanol, a considerable increase in the extent of the injury was noted. These include alterations in membranes-bound enzymes and clotting mechanisms, and alteration of cell membranes through abnormal free radical reactions. 相似文献
107.
GO Korsrud HB Conacher GA Jarvis JL Beare-Rogers 《Canadian Metallurgical Quarterly》1977,12(2):177-181
A quantitative counterimmunoelectrophoresis technique has been applied to evaluation of RNA antibodies in serum and unconcentrated CSF. Serum anti-RNA antibodies have been found at high dilutions in some patients with infectious diseases, subacute panencephalitis and multiple sclerosis. RNA antibodies in CSF are significantly linked to oligoclonal aspect, i.e. to a synthesis of IgG inside the CNS. 相似文献
108.
SM Genuth HB Houser JR Carter I Merkatz JW Price OP Schumacher RG Wieland 《Canadian Metallurgical Quarterly》1976,25(12):1110-1117
The Diabetes Association of greater Cleveland screened 307,000 individuals in the metropolitan area for diabetes with a 75-gm. oral load of carbohydrate. Of these subjects 12,600 (4.1 per cent) had a two-capillary blood glucose level of greater than 139 mg. per cent and were defined as positive. Seventy per cent of the positives were retested, and 65 per cent of these again had two-hour levels greater than 139 mg. per cent. Seventy-one per cent of the original screening values were between 104 and 199 mg. per cent. The rate of positivity on retesting increased with the original screening bracket reaching 90 per cent at an original screening level of 240 mg. per cent or higher. The frequency of positive retests also increased with age irrespective of whether the original screening level was less than or greater than 200 mg. per cent. The implications of this large detection experience for conducting future mass surveys for diabetes are discussed. 相似文献
109.
110.
Neonatal encephalopathy following fetal distress. A clinical and electroencephalographic study 总被引:2,自引:0,他引:2
Twenty-one neonates of over 36 weeks' gestation suffered perinatal asphyxia but not chronic hypoxia. Three clinical stages of postanoxic encephalopathy were distinguished. Stage 1 lasted less than 24 hours and was characterized by hyperalertness, uninhibited Moro and stretch reflexes, sympathetic effects, and a normal electroencephalogram. Stage 2 was marked by obtundation, hypotonia, strong distal flexion, and multifocal seizures. The EEG showed a periodic pattern sometimes preceded by continuous delta activity. Infants in stage 3 were stuporous, flaccid, and brain stem and autonomic functions were suppressed. The EEG was isopotential or had infrequent periodic discharges. Infants who did not enter stage 3 and who had signs of stage 2 for less than five days appeared normal in later infancy. Persistence of stage 2 for more than seven days or failure of the EEG to revert to normal was associated with later neurologic impairment or death. 相似文献