全文获取类型
收费全文 | 384篇 |
免费 | 2篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 3篇 |
综合类 | 6篇 |
化学工业 | 12篇 |
金属工艺 | 2篇 |
机械仪表 | 5篇 |
建筑科学 | 4篇 |
能源动力 | 2篇 |
轻工业 | 18篇 |
石油天然气 | 1篇 |
无线电 | 4篇 |
一般工业技术 | 12篇 |
冶金工业 | 310篇 |
自动化技术 | 9篇 |
出版年
2021年 | 1篇 |
2020年 | 3篇 |
2018年 | 1篇 |
2015年 | 2篇 |
2014年 | 2篇 |
2013年 | 12篇 |
2012年 | 4篇 |
2011年 | 5篇 |
2010年 | 7篇 |
2009年 | 7篇 |
2008年 | 7篇 |
2007年 | 4篇 |
2006年 | 1篇 |
2005年 | 2篇 |
2004年 | 3篇 |
2003年 | 4篇 |
1999年 | 9篇 |
1998年 | 109篇 |
1997年 | 50篇 |
1996年 | 25篇 |
1995年 | 20篇 |
1994年 | 13篇 |
1993年 | 24篇 |
1992年 | 3篇 |
1991年 | 4篇 |
1990年 | 3篇 |
1989年 | 8篇 |
1988年 | 3篇 |
1987年 | 3篇 |
1986年 | 1篇 |
1985年 | 4篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1981年 | 3篇 |
1979年 | 2篇 |
1977年 | 10篇 |
1976年 | 20篇 |
1975年 | 3篇 |
1973年 | 1篇 |
1971年 | 1篇 |
1970年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有388条查询结果,搜索用时 15 毫秒
101.
102.
103.
In Norway, the work on multimodal travel information services is based on ARKTRANS, the national framework architecture for multimodal intelligent transportation systems (ITS). ARKTRANS is harmonised across all transport modes, and arranges for services supporting all phases of door-to-door travel. The authors describe the process towards such services and how they are enabled by ARKTRANS. As a result of ARKTRANS, the experience gained in pilot projects providing new and improved travel information services can be transferred into generic knowledge and used in national, regional and local travel planners. Stakeholder involvement, use of existing solutions and the iterative evolution of services are described as well as the use of the architecture 相似文献
104.
EJ Heyer DC Adams RA Solomon GJ Todd DO Quest DJ McMahon SD Steneck TF Choudhri ES Connolly 《Canadian Metallurgical Quarterly》1998,29(6):1110-1115
BACKGROUND AND PURPOSE: One hundred twelve patients undergoing elective carotid endarterectomy for symptomatic and asymptomatic carotid artery stenosis were enrolled in a prospective study to evaluate the incidence of change in postoperative cerebral function. METHODS: Patients were evaluated preoperatively and postoperatively before hospital discharge and at follow-up 1 and 5 months later with a battery of neuropsychometric tests. The results were analyzed by both event-rate and group-rate analyses. For event-rate analysis, change was defined as either a decline or improvement in postoperative neuropsychometric performance by 25% or more compared with a preoperative baseline. RESULTS: Approximately 80% of patients showed decline in one or more test scores, and 60% had one or more improved test scores at the first follow-up examination. The percentage of declined test scores decreased and the percentage of improved test scores increased with subsequent follow-up examinations. Group-rate analysis was similar for group performance on individual tests. However, a decline in performance was seen most commonly on verbal memory tests, and improved performance was seen most commonly on executive and motor tests. CONCLUSIONS: Neuropsychometric evaluation of patients undergoing carotid endarterectomy for significant carotid artery stenosis demonstrates both declines and improvements in neuropsychometric performance. The test changes that showed decreased performance may be associated with ischemia from global hypoperfusion or embolic phenomena, and the improvement seen may be related to increased cerebral blood flow from removal of stenosis. 相似文献
105.
106.
Heterotopic gastric mucosa may occur throughout the gastrointestinal tract, including the upper esophagus. The capability of this ectopic mucosa to secrete acid has been suggested in different reports. We report for the first time a case of heterotopic gastric mucosa in the upper esophagus complicated by a stricture with secretion of acid demonstrated by prolonged ambulatory pH monitoring. Lansoprazole, 30 mg twice daily, produced symptom resolution, and repeat ambulatory pH showed complete acid suppression in the proximal esophagus. 相似文献
107.
D Pye KL Vandenberg SL Dyer DO Irving NH Goss GC Woodrow A Saul CR Alving RL Richards WR Ballou MJ Wu K Skoff RF Anders 《Canadian Metallurgical Quarterly》1997,15(9):1017-1023
Various formulations of the Plasmodium falciparum merozoite surface antigen, MSA-2, were made and tested in animals in order to select one for use in human vaccine trials. Recombinant constructs representing both major allelic forms of MSA-2 were formulated with a range of adjuvants and used to immunize rabbits, mice and sheep. After immunization, antibody responses obtained with the most potent adjuvants were at least tenfold greater than responses obtained with the least potent adjuvant Alhydrogel, which was used as the reference standard, although its lower potency indicated against its further use in clinical trials. Based on broadly similar results obtained with the three animal species, several adjuvants, including the water-in-oil adjuvant Montanide ISA 720, the oil-in-water adjuvant SAF-1, and liposomes containing lipid A formulated with Alhydrogel were demonstrated to be potent and potentially suitable for the clinical evaluation of MSA-2 as a candidate malaria vaccine antigen. Of these, ISA 720 was selected for further trial. 相似文献
108.
Endoscopic ultrasound (EUS) of the esophagus has been used primarily in staging biopsy-proven cancers. Its use as a primary diagnostic modality for esophageal malignancy has not been previously described. We report our recent experience in four patients with dysphagia and endoscopic biopsies negative for malignancy, including one patient with clinical and manometric features suggestive of achalasia. In all cases, EUS revealed a large infiltrating tumor invading through the esophageal wall into the surrounding tissues, and in one case into the aorta. Computed tomography suggested the possibility of a tumor in only one of the cases. Two patients underwent esophagectomy and were found to have adenocarcinoma. Two patients underwent repeat biopsy with alternative aggressive biopsy techniques and were found to have squamous cell carcinoma. We conclude that EUS is useful in the diagnosis of esophageal cancer and should be performed in selected patients with esophageal strictures whose biopsies are negative for malignancy; i.e., those with suspicious endoscopic or radiographic appearance, atypical presentation (e.g., profound weight loss, short duration of symptoms, or advanced age), and failure to respond to treatment. 相似文献
109.
110.
DO Kennedy S Nishimura T Hasuma Y Yano S Otani I Matsui-Yuasa 《Canadian Metallurgical Quarterly》1998,110(3):159-172
Recently, elucidation has progressed on a crucial role played by dendritic cells (DCs) in the induction of primary antigen-specific immune reactions. Although mature DCs exhibit potent antigen presenting function, DCs are scattered in nonlymphoid organs throughout the body as immature cells that have only minimum antigen presenting function. When they are stimulated to maturate, they increase their expression of class II major histocompatibility (MHC) antigen and several co-stimulatory molecules, resulting in the augmentation of antigen presenting function. Furthermore, these maturated DCs move to the T-dependent areas of secondary lymphoid organs to sensitize naive T cells for these antigens. Therefore, it is important to understand the mechanism to induce the maturation of DCs. Recent progress in the study of DC biology depicts various factors, such as cytokines, bacterial products and haptens, which are responsible for DC maturation. In this paper, the mechanism of DC maturation induced by cytokines and chemicals is described. 相似文献