全文获取类型
收费全文 | 2574篇 |
免费 | 236篇 |
国内免费 | 63篇 |
专业分类
电工技术 | 52篇 |
综合类 | 198篇 |
化学工业 | 80篇 |
金属工艺 | 212篇 |
机械仪表 | 97篇 |
建筑科学 | 118篇 |
矿业工程 | 66篇 |
能源动力 | 26篇 |
轻工业 | 1390篇 |
水利工程 | 34篇 |
石油天然气 | 44篇 |
武器工业 | 16篇 |
无线电 | 90篇 |
一般工业技术 | 83篇 |
冶金工业 | 228篇 |
自动化技术 | 139篇 |
出版年
2024年 | 20篇 |
2023年 | 41篇 |
2022年 | 75篇 |
2021年 | 77篇 |
2020年 | 74篇 |
2019年 | 86篇 |
2018年 | 75篇 |
2017年 | 89篇 |
2016年 | 81篇 |
2015年 | 106篇 |
2014年 | 163篇 |
2013年 | 145篇 |
2012年 | 161篇 |
2011年 | 182篇 |
2010年 | 136篇 |
2009年 | 124篇 |
2008年 | 135篇 |
2007年 | 164篇 |
2006年 | 139篇 |
2005年 | 145篇 |
2004年 | 120篇 |
2003年 | 86篇 |
2002年 | 80篇 |
2001年 | 70篇 |
2000年 | 52篇 |
1999年 | 54篇 |
1998年 | 38篇 |
1997年 | 28篇 |
1996年 | 21篇 |
1995年 | 15篇 |
1994年 | 23篇 |
1993年 | 16篇 |
1992年 | 15篇 |
1991年 | 5篇 |
1990年 | 6篇 |
1989年 | 7篇 |
1988年 | 8篇 |
1987年 | 6篇 |
1986年 | 2篇 |
1982年 | 1篇 |
1980年 | 1篇 |
1958年 | 1篇 |
排序方式: 共有2873条查询结果,搜索用时 15 毫秒
1.
2.
Zaidatul Akmal Othman Zaida Zakaria Joseph Bagi Suleiman Victor Udo Nna Aminah Che Romli Wan Syaheedah Wan Ghazali Mahaneem Mohamed 《International journal of molecular sciences》2021,22(8)
Obesity and hyperlipidemia are major risk factors for developing vascular diseases. Bee bread (BB) has been reported to exhibit some biological actions, including anti-obesity and anti-hyperlipidemic. This study aims to investigate whether bee bread can ameliorate vascular inflammation and impaired vasorelaxation activity through eNOS/NO/cGMP pathway in obese rats. Forty male Sprague-Dawley rats were randomly divided into four groups (n = 10/group), namely: control (normal group), obese rats (OB group), obese rats treated with bee bread (0.5 g/kg/day, OB/BB group) and obese rats treated with orlistat (10 mg/kg/day, OB/OR group). The latter three groups were given a high-fat diet (HFD) for 6 weeks to induced obesity before being administered with their respective treatments for another 6 weeks. After 12 weeks of the total experimental period, rats in the OB group demonstrated significantly higher Lee obesity index, lipid profile (total cholesterol, triglyceride, low-density lipoprotein), aortic proinflammatory markers (tumor necrosis factor-α, nuclear factor-κβ), aortic structural damage and impairment in vasorelaxation response to acetylcholine (ACh). Bee bread significantly ameliorated the obesity-induced vascular damage manifested by improvements in the lipid profile, aortic inflammatory markers, and the impaired vasorelaxation activity by significantly enhancing nitric oxide release, promoting endothelial nitric oxide synthase (eNOS) and cyclic guanosine monophosphate (cGMP) immunoexpression. These findings suggest that the administration of bee bread ameliorates the impaired vasorelaxation response to ACh by improving eNOS/NO/cGMP-signaling pathway in obese rats, suggesting its vascular therapeutic role. 相似文献
3.
4.
ABSTRACT: Grain of the soft white wheat cultivar Harus was harvested weekly from anthesis to maturity and fructooligosaccharides (FOS) contents were determined by reversed-phase high-performance liquid chromatography. Tests were carried out to determine the effect of adding immature wheat meal to a base flour of cultivar Russ (hard red spring) on the quality characteristics of bread. FOS content was also analyzed in baked bread, and the effect of transglutaminase in improving bread quality was examined. Marked decreases in FOS contents, such as 1-kestose and nystose, were observed with grain maturation. The overall quality of bread appeared to be acceptable, and the added FOS were retained after baking. 相似文献
5.
大规格圆钢质量分析和控制 总被引:1,自引:0,他引:1
针对湘钢棒材厂生产大规格圆钢出现的表面质量问题,重点介绍了在成品轧机后采用U形辊道和立活套替换棍道;冷床输入辊道采用镶WT合金套;增设高压水除鳞装置;中间轧件尺寸精度控制等措施,成功的解决了大规格圆钢表面擦伤、“麻面”、尺寸超差等表面质量问题,产品质量显著提高。 相似文献
6.
本文通过焊接试验对奥氏体不锈钢绕带容器环板与绕带焊接工艺进行了研究分析,并得出了合理的焊接方法和工艺参数。 相似文献
7.
8.
10.
Effect of Flour Quality, Ascorbic Acid, and DATEM on Dough Rheological Parameters and Hearth Loaves Characteristics 总被引:1,自引:0,他引:1
ABSTRACT: The effects of protein quality, protein content, ascorbic acid, diacetyl tartaric acid ester of monoglyc-erides (DATEM), and their interactions on dough rheology and hearth bread properties were studied by size-exclusion fast protein liquid chromatography, Kieffer Dough & Gluten Extensibility Rig, and small-scale baking of hearth loaves. The effect of protein content was either positive or negative on hearth loaf characteristics, form ratio, and area, depending on the amount of the largest glutenin polymers in the flour. Ascorbic acid brought out the potential in the wheat flour known as protein quality. Ascorbic acid and DATEM strengthened the doughs and improved hearth bread characteristics. 相似文献