全文获取类型
收费全文 | 795篇 |
免费 | 5篇 |
专业分类
综合类 | 2篇 |
化学工业 | 11篇 |
机械仪表 | 6篇 |
矿业工程 | 1篇 |
轻工业 | 14篇 |
无线电 | 3篇 |
一般工业技术 | 6篇 |
冶金工业 | 750篇 |
原子能技术 | 1篇 |
自动化技术 | 6篇 |
出版年
2022年 | 3篇 |
2021年 | 1篇 |
2020年 | 1篇 |
2018年 | 3篇 |
2016年 | 2篇 |
2014年 | 2篇 |
2013年 | 4篇 |
2012年 | 6篇 |
2011年 | 6篇 |
2010年 | 2篇 |
2009年 | 5篇 |
2008年 | 5篇 |
2006年 | 3篇 |
2005年 | 2篇 |
2004年 | 1篇 |
2003年 | 2篇 |
1999年 | 23篇 |
1998年 | 199篇 |
1997年 | 107篇 |
1996年 | 83篇 |
1995年 | 49篇 |
1994年 | 43篇 |
1993年 | 47篇 |
1992年 | 10篇 |
1991年 | 11篇 |
1990年 | 15篇 |
1989年 | 14篇 |
1988年 | 18篇 |
1987年 | 14篇 |
1986年 | 8篇 |
1985年 | 8篇 |
1983年 | 2篇 |
1982年 | 7篇 |
1981年 | 8篇 |
1980年 | 9篇 |
1979年 | 1篇 |
1978年 | 3篇 |
1977年 | 10篇 |
1976年 | 56篇 |
1975年 | 5篇 |
1974年 | 1篇 |
1955年 | 1篇 |
排序方式: 共有800条查询结果,搜索用时 790 毫秒
131.
132.
133.
It is estimated that there are 750,000 people each year who are intimately affected by suicide. Prominent among these are the family survivors and their family physician. This paper offers a time frame which divides the period following the suicide into three phases: Immediate (the first ten days after the suicide); Intermediate (after the first ten days through the first year); and Extended (from the first year until restitution occurs). It identifies the chief emotional reactions which occur in each phase, explores their psychodynamic origins, and proposes suggestions for appropriate management during each of the three periods. The goal of this plan of management is to enable the family physician to function in a supportive emphatic, and restorative manner for the post-suicide family. 相似文献
134.
ML Pantelides JV Moore E Forbes TG Truscott NJ Blacklock 《Canadian Metallurgical Quarterly》1993,57(5):838-841
The relative distribution of sensitizer drugs in the prostate and its contiguous organs is of importance in the treatment of localized prostatic cancer with photodynamic therapy. Using the primate model, whose prostate is both morphologically and physiologically homologous with its human counterpart, the distribution of hematoporphyrin derivative (HpD) amongst organs of urological interest was determined. Hematoporphyrin derivative levels were comparatively low in both caudal and cranial prostatic lobes (0.93-1.77 micrograms/g) and were similar to those in rectum, urethra and the skin. The reticuloendothelial organs, liver, spleen and also the kidney accumulated the highest quantities of porphyrin (4.76-9.8 micrograms/g, liver > spleen > kidney). Despite a high avidity of prostatic tissue for zinc, a zinc-metalloporphyrin (Zn-HpD) did not concentrate selectively in the prostate. The results are of clinical value in view of the homology between the primate and the human. 相似文献
135.
136.
F Ramirez JV O'Donnell PA Marks A Bank S Musumeci G Schilirò G Pizzarelli G Russo B Luppis R Gambino 《Canadian Metallurgical Quarterly》1976,263(5577):471-475
In patients with betao thalassaemia from Ferrara, beta globin mRNA sequences are either absent or structurally abnormal while in betao thalassaemia in Catania, beta globin mRNA sequences are present. In deltabeta thalassaemia there is a deletion of beta-like globin genes, while in betao Catania DNA, no beta globin gene deletion is detectable. 相似文献
137.
138.
139.
The safety of deep corneal incisions in radial keratotomy was evaluated in a porcine model of blunt trauma. One eye of each enucleated pair (right and left) of porcine eyes was subjected to a variation of radial keratotomy; the fellow eyes served as unoperated-on controls. All eyes were subjected to a standard injury. Control eyes ruptured at the equatorial sclera. Eyes with radial incisions cut through approximately 70% of corneal thickness also ruptured at the equator. When incisions of this depth (70%) were extended across the limbus (rather than to the corneal-scleral junction), all ruptures occurred at the limbal incisions. Eyes cut 95% to 100% of corneal thickness tended to rupture at the incisions. The safety of deep radial keratotomy incisions with respect to ocular integrity is discussed. 相似文献
140.
A Milián Masanet JV Bagán Sebastián J Riera Grimalt E Lloria de Miguel Y Jiménez Soriano 《Canadian Metallurgical Quarterly》1998,49(5):408-410
Aspergillosis is an opportunistic deep mycosis that occurs in immunocompromised patients, often in the paranasal sinuses. However, it sometimes occurs in healthy subjects, producing symptoms similar to those of a chronic sinusitis that is unresponsive to conventional treatment. A possible entry point for Aspergillus is the oroantral communication originated by perforation of the dental root cavity during root canal of a molar with penetration of material. We report the clinical case of a patient with symptoms of chronic sinusitis who was diagnosed as sinus aspergillosis after radiological and histological study. The origin may have been a third upper molar in which a root canal was performed. 相似文献