全文获取类型
收费全文 | 416篇 |
免费 | 2篇 |
专业分类
电工技术 | 11篇 |
化学工业 | 32篇 |
金属工艺 | 31篇 |
机械仪表 | 7篇 |
建筑科学 | 2篇 |
能源动力 | 2篇 |
轻工业 | 11篇 |
无线电 | 32篇 |
一般工业技术 | 49篇 |
冶金工业 | 198篇 |
自动化技术 | 43篇 |
出版年
2022年 | 4篇 |
2021年 | 7篇 |
2018年 | 4篇 |
2016年 | 11篇 |
2015年 | 3篇 |
2014年 | 4篇 |
2013年 | 11篇 |
2012年 | 12篇 |
2011年 | 12篇 |
2010年 | 13篇 |
2009年 | 11篇 |
2008年 | 9篇 |
2007年 | 6篇 |
2006年 | 15篇 |
2005年 | 4篇 |
2004年 | 7篇 |
2003年 | 5篇 |
2002年 | 8篇 |
2001年 | 5篇 |
2000年 | 8篇 |
1999年 | 7篇 |
1998年 | 44篇 |
1997年 | 42篇 |
1996年 | 15篇 |
1995年 | 10篇 |
1994年 | 12篇 |
1993年 | 12篇 |
1992年 | 11篇 |
1991年 | 7篇 |
1990年 | 7篇 |
1989年 | 11篇 |
1988年 | 8篇 |
1987年 | 12篇 |
1986年 | 5篇 |
1985年 | 3篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1981年 | 4篇 |
1980年 | 2篇 |
1979年 | 3篇 |
1977年 | 4篇 |
1976年 | 5篇 |
1975年 | 3篇 |
1974年 | 4篇 |
1972年 | 5篇 |
1971年 | 1篇 |
1970年 | 4篇 |
1969年 | 4篇 |
1968年 | 3篇 |
1964年 | 1篇 |
排序方式: 共有418条查询结果,搜索用时 15 毫秒
411.
J O'Connor D Ballantyne JG Pollock B Cairney TD Lawrie 《Canadian Metallurgical Quarterly》1977,27(3):325-331
Fourteen patients with hyperlipoproteinaemia and peripheral vascular disease have been investigated to determine the effect on limb blood flow of hypolipidaemic therapy. Satisfactory lowering of serum lipoprotein levels was achieved in the treated group. There was a significant deterioration in peak reactive blood flow measurements in the placebo group compared with the treated group. Treatment of hyperlipoproteinaemia may, therefore, be of value in preventing the progression of peripheral atherosclerosis. 相似文献
412.
Kai Chang Michael A. Pollock Michael K. Skrehot G. Dickey Jerry Suddath 《Journal of Infrared, Millimeter and Terahertz Waves》1989,10(1):1-19
A 35 GHz millimeter-wave radar system has been studied for space debris tracking. The objective is to track the particles ranging in size from 4 mm to 80 mm up to a range of 25 km. The system requires various state-of-the-art technologies including phased arrays, monopulse tracking, pulse compression, high power transmitters, low noise receivers, and pulse integration signal processing techniques. 相似文献
413.
This paper investigates decision-theoretic planning in sophisticated autonomous agents operating in environments of real-world complexity. An example might be a planetary rover exploring a largely unknown planet. It is argued that existing algorithms for decision-theoretic planning are based on a logically incorrect theory of rational decision making. Plans cannot be evaluated directly in terms of their expected values, because plans can be of different scopes, and they can interact with other previously adopted plans. Furthermore, in the real world, the search for optimal plans is completely intractable. An alternative theory of rational decision making is proposed, called "locally global planning." 相似文献
414.
415.
J. R. A. Pollock 《Journal of the Institute of Brewing》1981,87(6):356-359
By extraction of acidified aqueous extracts of malt with organic solvents, methylation of the resulting extracts, gas chromatography and detection with a nitrosamine-specific detector, it is shown that N-nitrosoproline is present in malt and that N-nitrososarcosine is sometimes present. N-Nitrosopipecolinic acid has not been observed. 相似文献
416.
Jean-Charles Stinville Etienne Martin Mallikarjun Karadge Shak Ismonov Monica Soare Tim Hanlon Sairam Sundaram McLean P. Echlin Patrick G. Callahan William C. Lenthe Jiashi Miao Andrew E. Wessman Rebecca Finlay Adrian Loghin Judson Marte Tresa M. Pollock 《Metallurgical and Materials Transactions A》2018,49(9):3865-3873
Cyclic fatigue experiments in the high and very high cycle fatigue regimes have been performed on a René 88DT polycrystalline nickel-based superalloy. The microstructural configurations that favor early strain localization and fatigue crack initiation at high temperature from 400 °C to 650 °C have been investigated. Competing failure modes are observed in the high to the very high cycle fatigue regime. Fatigue cracks initiate from non-metallic inclusions and from intrinsic internal microstructural features. Interestingly, as stresses are reduced into the very high cycle regime, there is a transition to initiation only at crystallographic facets. At higher stress in the high cycle fatigue regime, a significant fraction of specimens initiate cracks at non-metallic inclusions. This transition is analyzed with regard to microstructural features that favor strain localization and accumulate damage early during cycling. 相似文献
417.
Ji Bian Ann Liebert Brian Bicknell Xin-Ming Chen Chunling Huang Carol A. Pollock 《International journal of molecular sciences》2022,23(14)
Chronic kidney disease (CKD) is a growing global public health problem. The implementation of evidence-based clinical practices only defers the development of kidney failure. Death, transplantation, or dialysis are the consequences of kidney failure, resulting in a significant burden on the health system. Hence, innovative therapeutic strategies are urgently needed due to the limitations of current interventions. Photobiomodulation (PBM), a form of non-thermal light therapy, effectively mitigates mitochondrial dysfunction, reactive oxidative stress, inflammation, and gut microbiota dysbiosis, all of which are inherent in CKD. Preliminary studies suggest the benefits of PBM in multiple diseases, including CKD. Hence, this review will provide a concise summary of the underlying action mechanisms of PBM and its potential therapeutic effects on CKD. Based on the findings, PBM may represent a novel, non-invasive and non-pharmacological therapy for CKD, although more studies are necessary before PBM can be widely recommended. 相似文献
418.
Henry H. L. Wu Ewa M. Goldys Carol A. Pollock Sonia Saad 《International journal of molecular sciences》2022,23(14)
Chronic kidney disease (CKD) is a global health issue, affecting more than 10% of the worldwide population. The current approach for formal diagnosis and prognostication of CKD typically relies on non-invasive serum and urine biomarkers such as serum creatinine and albuminuria. However, histological evidence of tubulointerstitial fibrosis is the ‘gold standard’ marker of the likelihood of disease progression. The development of novel biomedical technologies to evaluate exfoliated kidney cells from urine for non-invasive diagnosis and prognostication of CKD presents opportunities to avoid kidney biopsy for the purpose of prognostication. Efforts to apply these technologies more widely in clinical practice are encouraged, given their potential as a cost-effective approach, and no risk of post-biopsy complications such as bleeding, pain and hospitalization. The identification of biomarkers in exfoliated kidney cells from urine via western blotting, enzyme-linked immunosorbent assay (ELISA), immunofluorescence techniques, measurement of cell and protein-specific messenger ribonucleic acid (mRNA)/micro-RNA and other techniques have been reported. Recent innovations such as multispectral autofluorescence imaging and single-cell RNA sequencing (scRNA-seq) have brought additional dimensions to the clinical application of exfoliated kidney cells from urine. In this review, we discuss the current evidence regarding the utility of exfoliated proximal tubule cells (PTC), podocytes, mesangial cells, extracellular vesicles and stem/progenitor cells as surrogate markers for the early diagnosis and prognostication of CKD. Future directions for development within this research area are also identified. 相似文献