全文获取类型
收费全文 | 8499篇 |
免费 | 4篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 1篇 |
综合类 | 5篇 |
化学工业 | 36篇 |
金属工艺 | 5篇 |
建筑科学 | 5篇 |
轻工业 | 13篇 |
水利工程 | 1篇 |
石油天然气 | 3篇 |
武器工业 | 1篇 |
无线电 | 10篇 |
一般工业技术 | 18篇 |
冶金工业 | 8387篇 |
原子能技术 | 1篇 |
自动化技术 | 18篇 |
出版年
2022年 | 1篇 |
2020年 | 4篇 |
2018年 | 2篇 |
2016年 | 2篇 |
2015年 | 1篇 |
2014年 | 4篇 |
2013年 | 3篇 |
2012年 | 4篇 |
2011年 | 5篇 |
2010年 | 5篇 |
2009年 | 5篇 |
2008年 | 5篇 |
2007年 | 8篇 |
2006年 | 7篇 |
2005年 | 7篇 |
2004年 | 13篇 |
2003年 | 12篇 |
2002年 | 1篇 |
2001年 | 3篇 |
2000年 | 6篇 |
1999年 | 278篇 |
1998年 | 2682篇 |
1997年 | 1489篇 |
1996年 | 952篇 |
1995年 | 551篇 |
1994年 | 422篇 |
1993年 | 528篇 |
1992年 | 62篇 |
1991年 | 102篇 |
1990年 | 99篇 |
1989年 | 87篇 |
1988年 | 95篇 |
1987年 | 91篇 |
1986年 | 95篇 |
1985年 | 66篇 |
1984年 | 1篇 |
1983年 | 9篇 |
1982年 | 35篇 |
1981年 | 38篇 |
1980年 | 77篇 |
1979年 | 3篇 |
1978年 | 12篇 |
1977年 | 182篇 |
1976年 | 431篇 |
1975年 | 9篇 |
1963年 | 2篇 |
1955年 | 7篇 |
1954年 | 1篇 |
排序方式: 共有8504条查询结果,搜索用时 15 毫秒
101.
Chondromas are benign tumours of cartilage which are rare in the head and neck. We present a case report of a chondroma in the neck of condyle and demonstrate the value of multiplanar spiral CT and the limitations of 3D reconstruction. 相似文献
102.
103.
104.
105.
In recent years fracture fixation in the horse has changed significantly. New devices, mainly adapted from the human field, have been successfully introduced into large animal surgery. Examples of such implants include the DCS/DHS implant system, the self-tapping screw, the cannulated screw, and the pinless external fixator. However, new devices have also been developed exclusively for equine fracture management, including the interlocking intramedullary nail and the external skeletal fixation device. With these devices the surgeon has more options for repairing fractures in horses. Nevertheless, many problems are still unsolved. Indications exist that during the next few years new, exciting fracture fixation systems will be developed, providing further advancements in the quest for the ideal implant for horses. However, the development stages of these devices are such that mentioning the possibilities here is premature. 相似文献
106.
The characteristics of the five Korean isolates of Japanese encephalitis (JE) virus were compared with those of the already reported JE virus strains from Japan and China using the hemagglutination test and polymerase chain reaction direct sequencing of the JE virus genomes (capsid/premembrane, envelope region). The hemagglutination patterns of all the isolates were distinctly different from the Nakayama-NIH strain. The optimal pH of hemagglutination of all the Korean isolates was 6.6-7.0 and the reaction range was broader than that of the Nakayama-NIH strain. The 198 nucleotide sequences in the capsid/premembrane gene region of the five Korean strains indicated that they were classified into the third genotype group, the JE strains from the countries in the temperate zone including the Nakayama-NIH, JaOArS982, and Beijing-1 strains. Four of the five Korean isolates formed a unique phylogenetic tree within the third genotype group, although the last one was genetically highly related to the Nakayama-NIH strain. The 251 nucleotide sequences in the envelope region of the five isolates were more divergent than the capsid/premembrane region. Four of the five isolates showed a large nucleotide divergency as compared with the JaOArS982 strain (< or = 12.4%), but the last one was similar to the JaOArS982 strain (98% of nucleotide homology). These results suggest the evolutionary divergence of the JE viruses isolated in Korea from the Japanese and Chinese strains and that there may exist at least two antigenically different JE virus strains in Korea. 相似文献
107.
108.
CR Marmar DS Weiss WE Schlenger JA Fairbank BK Jordan RA Kulka RL Hough 《Canadian Metallurgical Quarterly》1994,151(6):902-907
OBJECTIVE: The aim of this study was to determine the reliability and validity of a proposed measure of peritraumatic dissociation and, as part of that effort, to determine the relationship between dissociative experiences during disturbing combat trauma and the subsequent development of posttraumatic stress disorder (PTSD). METHOD: A total of 251 male Vietnam theater veterans from the Clinical Examination Component of the National Vietnam Veterans Readjustment Study were examined to determine the relationship of war zone stress exposure, retrospective reports of dissociation during the most disturbing combat trauma events, and general dissociative tendencies with PTSD case determination. RESULTS: The total score on the Peritraumatic Dissociation Experiences Questionnaire--Rater Version was strongly associated with level of posttraumatic stress symptoms, level of stress exposure, and general dissociative tendencies and weakly associated with general psychopathology scales from the MMPI-2. Logistic regression analyses supported the incremental value of dissociation during trauma, over and above the contributions of level of war zone stress exposure and general dissociative tendencies, in accounting for PTSD case determination. CONCLUSIONS: These results provide support for the reliability and validity of the Peritraumatic Dissociation Experiences Questionnaire--Rater Version and for a trauma-dissociation linkage hypothesis: the greater the dissociation during traumatic stress exposure, the greater the likelihood of meeting criteria for current PTSD. 相似文献
109.
1. A case of poisoning due to the raw root tuber of a Chinese medicinal plant, Alocasia macrorrhiza is presented. 2. The patient developed neurological (severe pain and numbness in the perioral area and throat) and gastrointestinal (nausea, vomiting, abdominal pain) symptoms immediately after eating the root tuber. 3. A macrorrhiza has properties and morphology very similar to another medical plant. A. odora. The root tuber of the latter is known to contain a neurotoxin sapotoxin. 相似文献
110.
Mechanisms for the abnormal copper (Cu) accumulation in the liver of LEC rats were examined using primary cultured liver parenchymal cells prepared from mutant LEC rats and those from control LEA rats (original strain). The Cu and metallothionein (MT) mRNA levels in the liver of LEC rats were caused to decrease to the same levels as those of LEA rats by removing Cu in vivo selectively with tetrathiomolybdate. Cu was taken up by LEC rat cells to the same extent as LEA rat cells by exposure to low medium Cu and to a higher extent by exposure to high medium Cu, while the MT mRNA level in LEC rat cells increased dose-dependently at a much higher rate than that in LEA rats. MT mRNA levels in both cells were comparable by exposure to cadmium, zinc and dexamethasone. The results indicate that expression of MT mRNA is selectively enhanced by Cu in LEC cells despite the fact that uptake of Cu is comparable with normal cells. 相似文献