全文获取类型
收费全文 | 1658篇 |
免费 | 130篇 |
国内免费 | 15篇 |
专业分类
电工技术 | 2篇 |
综合类 | 52篇 |
化学工业 | 109篇 |
金属工艺 | 5篇 |
机械仪表 | 16篇 |
建筑科学 | 15篇 |
矿业工程 | 1篇 |
能源动力 | 6篇 |
轻工业 | 1502篇 |
水利工程 | 2篇 |
石油天然气 | 13篇 |
武器工业 | 1篇 |
无线电 | 18篇 |
一般工业技术 | 23篇 |
冶金工业 | 5篇 |
原子能技术 | 6篇 |
自动化技术 | 27篇 |
出版年
2024年 | 19篇 |
2023年 | 27篇 |
2022年 | 52篇 |
2021年 | 63篇 |
2020年 | 80篇 |
2019年 | 80篇 |
2018年 | 61篇 |
2017年 | 58篇 |
2016年 | 87篇 |
2015年 | 73篇 |
2014年 | 70篇 |
2013年 | 98篇 |
2012年 | 127篇 |
2011年 | 112篇 |
2010年 | 73篇 |
2009年 | 55篇 |
2008年 | 63篇 |
2007年 | 87篇 |
2006年 | 84篇 |
2005年 | 66篇 |
2004年 | 42篇 |
2003年 | 46篇 |
2002年 | 45篇 |
2001年 | 33篇 |
2000年 | 16篇 |
1999年 | 32篇 |
1998年 | 24篇 |
1997年 | 14篇 |
1996年 | 12篇 |
1995年 | 13篇 |
1994年 | 11篇 |
1993年 | 10篇 |
1992年 | 4篇 |
1991年 | 11篇 |
1990年 | 7篇 |
1989年 | 10篇 |
1988年 | 8篇 |
1987年 | 13篇 |
1986年 | 4篇 |
1985年 | 6篇 |
1984年 | 3篇 |
1982年 | 1篇 |
1980年 | 2篇 |
1979年 | 1篇 |
排序方式: 共有1803条查询结果,搜索用时 0 毫秒
71.
72.
73.
花芸豆淀粉的性质研究 总被引:1,自引:0,他引:1
研究测定花芸豆淀粉颗粒、糊及其凝胶等特性。发现淀粉颗粒多呈椭圆的腰形,少数圆形,大颗粒表面有明显轮纹,有呈细长或中心放射状的位于颗粒中部的裂纹;偏光十字清晰,多沿长轴方向拉伸呈X形;线条有少许弯曲,有裂纹的颗粒,其偏光十字多有分叉。粒径范围为10~60μm,平均粒径24μm,呈A型结晶图样,结晶区约56.8%,糊化温度73.7~88.3℃,糊化焓15.8 J/g。淀粉碘复合物可见光吸收光谱的最大吸收波长为607nm,链淀粉相对含量为38.4%。花芸豆淀粉糊的抗剪切能力、凝沉性、冻融性和粘度等特性都与玉米淀粉较相近,糊丝长度小,为1.1 cm。加糖对淀粉凝胶的破裂强度及弹性模量的影响较大。 相似文献
74.
从腐败的豆瓣酱中分离获得了1株细菌和1株酵母菌;进行了苦瓜提取物对它们的抑制作用实验,并做了苦瓜提取物用于豆瓣酱防腐的应用试验,研究了添加不同浓度苦瓜提取物对豆瓣酱风味的影响。 相似文献
75.
The effect of volatiles related to feeding activity of nonprey caterpillars, Spodoptera exigua, on the olfactory response of the predatory mites Phytoseiulus persimilis was examined in a Y-tube olfactometer. At a low caterpillar density (20 caterpillars on 10 Lima bean leaves), the predators were significantly more attracted to volatiles from infested leaves on which the caterpillars and their products were present or from infested leaves from which the caterpillars and their products had been removed when compared to volatiles from uninfested leaves. The predators, however, significantly avoided odors from 20 caterpillars and their products (mainly feces) removed from bean leaves. In contrast, at a higher caterpillar density (100 caterpillars on 10 Lima bean leaves), the predators avoided volatiles from caterpillar-infested bean leaves. Volatiles from infested leaves from which the caterpillars and their products had been removed were not preferred over volatiles from uninfested leaves. Volatiles from feces collected from 100 caterpillars were strongly avoided by the predators, while the behavior of the predatory mites was not affected by volatiles from 100 caterpillars removed from a plant. The data show that carnivorous arthropods may avoid nonprofitable herbivores. This avoidance seems to result from an interference of volatiles from herbivore products with the attraction to herbivore-induced plant volatiles. 相似文献
76.
77.
Yuwei Luo Weihua Xie Qunxiang Cui 《International Journal of Food Science & Technology》2010,45(2):358-364
Simulations of gastro‐intestinal digestion was used to try to identify the nature of the complexes between antinutritional factors and zinc in faba bean fractions. In the hull fraction, the action of phytases and the simultaneous action of cellulase and phytase allowed about 7% and 35% additional zinc to be solubilised, respectively. Single enzymatic degradation of phytates from dehulled faba bean allowed solubilisation from 65% to 93% of zinc depending upon the treatment. The zinc of faba bean flour was mainly linked to phytates and the greater the degree of phytate degradation before in vitro digestion, the greater the quantity of zinc released. In dehulled faba bean zinc was almost exclusively chelated by phytates. In the hull of faba bean, the majority of zinc was chelated in complexes between phytates and fibres. 相似文献
78.
Inmaculada Mateos-Aparicio Araceli Redondo-Cuenca María-José Villanueva-Suárez María-Aurora Zapata-Revilla María-Dolores Tenorio-Sanz 《LWT》2010,43(9):1467-1470
Disposal of by-products generated by plant food processing represent an important problem in the industry, but these by-products are also promising sources of compounds which may be used for their technological or nutritional properties, and today they are considered as a possible source of functional compounds. This work has contributed to the knowledge of three legume by-products, pea pod (Pisum sativum L.), broad bean pod (Vicia faba L.) and okara from soybean (Glycine max L.). These three by-products have in common that their major fraction is dietary fibre (pea pod: 58.6 g/100 g; okara: 54.3 g/100 g; broad bean pod: 40.1 g/100 g). Sucrose, glucose and fructose are the most important soluble sugars in both pods; however α-galactosides (stachyose and raffinose) are in greater concentration in okara. Protein is also a considerable component, although in higher amount in okara than in pods. Okara presents a large quantity of fat however both pods show similar low contents. Linoleic acid is the most important fatty acid; oleic acid is remarkable in okara and pea pod and linolenic acid in broad bean pod. Mineral amount is major in by-product pods than in okara, and the most important minerals are potassium, calcium and iron. 相似文献
79.
易嘉玲 《武汉工业学院学报》1994,(1)
豆渣虽是豆制品之残渣,但富含营养素,尤以含有纤维素为独特。而纤维素是人体保健之必需。豆渣来源广,价格低,开发以豆渣为原料的多种食品和食品添加剂已在国内外初见成效,本文介绍了豆渣在不同方面及不同功能的利用、制作的详细方法。 相似文献
80.
文章从吊装机械选择、布置、负荷分配及净空计算入手,到垂直度、同步性、就位三大措施,描述了该工程锅炉大板梁的吊装方案。 相似文献