全文获取类型
收费全文 | 207篇 |
免费 | 18篇 |
专业分类
电工技术 | 4篇 |
化学工业 | 56篇 |
机械仪表 | 3篇 |
建筑科学 | 13篇 |
能源动力 | 30篇 |
轻工业 | 40篇 |
无线电 | 11篇 |
一般工业技术 | 28篇 |
冶金工业 | 11篇 |
原子能技术 | 2篇 |
自动化技术 | 27篇 |
出版年
2024年 | 2篇 |
2023年 | 5篇 |
2022年 | 10篇 |
2021年 | 14篇 |
2020年 | 8篇 |
2019年 | 9篇 |
2018年 | 7篇 |
2017年 | 10篇 |
2016年 | 7篇 |
2015年 | 15篇 |
2014年 | 9篇 |
2013年 | 29篇 |
2012年 | 8篇 |
2011年 | 21篇 |
2010年 | 17篇 |
2009年 | 12篇 |
2008年 | 6篇 |
2007年 | 12篇 |
2006年 | 7篇 |
2005年 | 2篇 |
2004年 | 1篇 |
2003年 | 6篇 |
2002年 | 1篇 |
2001年 | 2篇 |
1996年 | 1篇 |
1993年 | 1篇 |
1990年 | 2篇 |
1984年 | 1篇 |
排序方式: 共有225条查询结果,搜索用时 15 毫秒
221.
Sakine Yalçın Suzan Yalçın Kemal Çakın Önder Eltan Levent Dağaşan 《Journal of the science of food and agriculture》2010,90(10):1695-1701
BACKGROUND: The objective of this study was to determine the effects of dietary yeast autolysate on performance, egg traits, egg cholesterol content, egg yolk fatty acid composition, lipid oxidation of egg yolk, some blood parameters and humoral immune response of laying hens during a 16 week period. A total of 225 Hyline Brown laying hens, 22 weeks of age, were allocated equally to one control group and four treatment groups. Yeast autolysate (Saccharomyces cerevisiae, InteWall) was used at levels of 1, 2, 3 and 4 g kg?1 in the diets of the first, second, third and fourth treatment groups respectively. RESULTS: Dietary treatments did not significantly affect body weight, feed intake and egg traits. Yeast autolysate supplementation increased egg production (P < 0.001) and egg weight (P < 0.001) and improved feed efficiency (P < 0.05). Yeast autolysate at levels of 2, 3 and 4 g kg?1 decreased egg yolk cholesterol level as mg g?1 yolk (P < 0.01) and blood serum levels of cholesterol and triglyceride (P < 0.05) and increased antibody titres to sheep red blood cells (P < 0.01). Total saturated fatty acids and the ratio of saturated/unsaturated fatty acids increased (P < 0.01) and total monounsaturated fatty acids (P < 0.001) decreased with yeast autolysate supplementation. CONCLUSION: Dietary yeast autolysate at levels of 2, 3 and 4 g kg?1 had beneficial effects on performance, egg cholesterol content and humoral immune response. It is concluded that 2 g kg?1 yeast autolysate will be enough to have beneficial effects in laying hens. Copyright © 2010 Society of Chemical Industry 相似文献
222.
Didar Sevim Oya Köseoğlu Durmuş Özdemir Mehmet Hakan Elif B. Büyükgök Hatice Uslu Özgür Dursun M. Kerem Savran Önder Eralp Serkan Kaptan Halil Köktürk Özlem Asker Sibel Pazarlı Melike Ayaztek Nurdan Akbaş Serkan Yalçın Pınar Çakır Topdemir 《Journal of the American Oil Chemists' Society》2023,100(3):197-213
Virgin olive oils (VOOs) obtained from olives grown in different regions of Turkey under changing climatic conditions sometimes show different sensory and chemical properties. This study was planned to determine whether these deviations are due to climatic changes or not. For this purpose, five different olive varieties (Ayvalık, Memecik, Gemlik, Nizip Yağlık, Kilis Yağlık) of commercial importance were harvested from the provinces/districts (four different region) where cultivation is intense during the 2017/2018–2020/2021 harvest years. Every year, olive samples were collected from 3 orchards from 13 provinces/districts. One hundred and fifty-six samples were subjected to the purity, quality and sensory analysis. Basic climatic values (average, minimum and maximum temperature, humidity and precipitation) were examined for four consecutive years. All of the examined olive oil samples were determined within the legal limits in terms of fatty acid composition and fatty acid ethyl ester values. However, delta-7-stigmastenol value from the sterol composition was found to be above 0.5% in some samples in all the years studied (total 21 samples). Delta-7-stigmastenol values of olive oil samples varied between 0.16% and 1.14%. Multiple linear regression analysis was applied using a genetic algorithm-based inverse least squares method to determine whether there is a relationship between climate data and delta-7-stigmastenol values. According to this result, it has been determined that the delta-7-stigmastenol value is high when the annual average relative humidity is low and the annual average temperature is high. There is an urgent need to make forward-looking plans due to climate change. 相似文献
223.
Noor Abu Jarad Kenneth Rachwalski Fereshteh Bayat Shadman Khan Amid Shakeri Roderick MacLachlan Martin Villegas Eric D. Brown Leyla Soleymani Tohid F. Didar 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(12):2205761
Engineered surfaces that repel pathogens are of great interest due to their role in mitigating the spread of infectious diseases. A robust, universal, and scalable omniphobic spray coating with excellent repellency against water, oil, and pathogens is presented. The coating is substrate-independent and relies on hierarchically structured polydimethylsiloxane (PDMS) microparticles, decorated with gold nanoparticles (AuNPs). Wettability studies reveal the relationship between surface texturing of micro- and/or nano-hierarchical structures and the omniphobicity of the coating. Studies of pathogen transfer with bacteria and viruses reveal that an uncoated contaminated glove transfers pathogens to >50 subsequent surfaces, while a coated glove picks up 104 (over 99.99%) less pathogens upon first contact and transfers zero pathogens after the second touch. The developed coating also provides excellent stability under harsh conditions. The remarkable anti-pathogen properties of this surface combined with its ease of implementation, substantiate its use for the prevention of surface-mediated transmission of pathogens. 相似文献
224.
Leyla Nur Akay Cevriye Kalkandelen Necmettin Akti Merve Sazimet Sengul Cumali Tav Ugur Yahsi Ziya Engin Erkmen 《Journal of the American Ceramic Society》2023,106(5):3220-3227
In this study, the nanostructural vacancy behavior of bovine derived hydroxyapatite (BHA) doped with powder zirconmullite (ZM) contents of 5, 7.5, 10 and 12.5 wt.% were presented at sintering temperatures of 1000, 1100, 1200 and 1300°C. ZM-doped BHA (ZM-BHA) was characterized by X-ray diffraction and positron annihilation lifetime spectroscopy (PALS). Density and hardness behavior were measured with respect to increasing sintering temperature. PALS results indicate that the longest lifetime component τ3 of ortho-positronium (o-Ps) localized at open spaces is attributed to the vacancy site and almost constant with the ZM contents and the sintering temperatures to have a mean value of 0.680 ns (corresponding to the radius of 0.997 nm). This average value is ascribed to the OH group defects along the main crystalline line. On the other hand, the o-Ps intensity attributed to the number of vacancy sites increases almost linearly with ZM additives and sintering temperatures. The intensity is also related to the density and hardness of ZM-BHA in terms of ZM contents. 相似文献