全文获取类型
收费全文 | 1734篇 |
免费 | 25篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 39篇 |
化学工业 | 327篇 |
金属工艺 | 34篇 |
机械仪表 | 29篇 |
建筑科学 | 74篇 |
矿业工程 | 9篇 |
能源动力 | 43篇 |
轻工业 | 98篇 |
水利工程 | 22篇 |
石油天然气 | 31篇 |
无线电 | 108篇 |
一般工业技术 | 264篇 |
冶金工业 | 442篇 |
原子能技术 | 32篇 |
自动化技术 | 208篇 |
出版年
2021年 | 25篇 |
2020年 | 18篇 |
2019年 | 25篇 |
2018年 | 29篇 |
2017年 | 25篇 |
2016年 | 25篇 |
2015年 | 18篇 |
2014年 | 32篇 |
2013年 | 96篇 |
2012年 | 48篇 |
2011年 | 82篇 |
2010年 | 63篇 |
2009年 | 53篇 |
2008年 | 57篇 |
2007年 | 65篇 |
2006年 | 43篇 |
2005年 | 37篇 |
2004年 | 38篇 |
2003年 | 41篇 |
2002年 | 40篇 |
2001年 | 28篇 |
2000年 | 22篇 |
1999年 | 21篇 |
1998年 | 66篇 |
1997年 | 50篇 |
1996年 | 37篇 |
1995年 | 39篇 |
1994年 | 42篇 |
1993年 | 27篇 |
1992年 | 21篇 |
1991年 | 16篇 |
1990年 | 28篇 |
1989年 | 24篇 |
1988年 | 25篇 |
1987年 | 34篇 |
1986年 | 23篇 |
1985年 | 36篇 |
1984年 | 18篇 |
1983年 | 23篇 |
1982年 | 25篇 |
1981年 | 23篇 |
1980年 | 15篇 |
1979年 | 26篇 |
1978年 | 20篇 |
1977年 | 22篇 |
1976年 | 22篇 |
1975年 | 30篇 |
1974年 | 15篇 |
1973年 | 19篇 |
1972年 | 15篇 |
排序方式: 共有1760条查询结果,搜索用时 15 毫秒
1.
Programming and Computer Software - In this paper, we overview the approaches and techniques employed by the Svace static analysis tool for intraprocedural analysis. This analysis implies the... 相似文献
2.
Jie Hong Chiang Allan K. Hardacre Michael E. Parker 《International Journal of Food Science & Technology》2020,55(2):649-659
This study investigated the effects of moisture content (MC) on the physicochemical properties of extruded meat alternatives made from Maillard-reacted beef bone hydrolysate and plant proteins. Samples were extruded at 170 °C (maximum barrel temperature), at 3.6 kg h−1 (liquid feed rate) and at 1.8, 2.2, 2.6 and 3.0 kg h−1 (dry feed rates) to obtain MC of 60%MC, 56%MC, 52%MC and 49%MC, respectively. Meat alternatives at 52%MC showed the greatest degree of texturisation. However, meat alternatives at 49%MC were the closest in terms of both textural and microstructural properties to reference sample, boiled chicken breast. Results from protein solubility suggested that a large amount of aggregated proteins were associated with hydrogen bonds, while disulphide bonds were the main contributor in the formation of fibrous structure in meat alternatives. Results showed that the change in MC as process parameter played an important role in the formation of fibrous structure in extruded meat alternatives. 相似文献
3.
Behaviormetrika - In the original publication of the article, Appendix A was published incorrectly. 相似文献
4.
Rodrigo Montoya Allan G. Ruiz-García Alma Ortiz-Ozuna Blanca Ramírez-Barat Juan Genesca 《工业材料与腐蚀》2021,72(7):1259-1269
The electrochemical interactions between aluminum alloy 7075 and low-carbon steels under gelled electrolytes were studied. Such electrolytes provided the opportunity to investigate both thick and thin electrolyte systems. The electrolyte was chemically modified to visually track the acidic fronts during the anodic reaction and the subsequent hydrolysis process. Two mathematical models were validated for both thick and ultrathin electrolytes. The acidification of thick electrolytes was extended some millimeters beyond the aluminum alloy surface, whereas the acidic front was localized next to the metallic joint using ultrathin electrolytes. The combination of both numerical and experimental results allows proving (and explaining why) that the acidification process is more aggressive under dilute than under concentrated electrolytes. 相似文献
5.
White James F. Holladay Johnathan E. Zacher Allan A. Frye John G. Werpy Todd A. 《Topics in Catalysis》2014,57(17):1325-1334
Fermentation derived succinic acid ammonium salt is an ideal precursor for manufacture of renewable N-methyl pyrrolidinone (NMP) or 2-pyrrolidinone (2P) via heterogeneous catalysis. However, there are many challenges to making this a practical reality. Chief among the challenges is avoiding catalyst poisoning by fermentation by- and co-products. Battelle/Pacific Northwest National Laboratory have developed an effective technology strategy for this purpose. The technology is a combination of purely thermal processing, followed by simple catalytic hydrogenation that together avoids catalyst poisoning from fermentation impurities and provides high selectivity and yields of NMP or 2P.
相似文献6.
Defined Conjugation of Glycans to the Lysines of CRM197 Guided by their Reactivity Mapping 下载免费PDF全文
Dr. Stefano Crotti Dr. Huili Zhai Dr. Jing Zhou Martin Allan Dr. Daniela Proietti Dr. Werner Pansegrau Dr. Qi‐Ying Hu Dr. Francesco Berti Dr. Roberto Adamo 《Chembiochem : a European journal of chemical biology》2014,15(6):836-843
Systematic characterisation of the reactivity of the lysine moieties in CRM197 towards N‐hydroxysuccinimide linkers bearing alkynes or azides is described. This involves two‐step conjugation of various glycans to CRM197 by click chemistry in a well‐defined manner. By semiquantitative LC‐MS/MS analysis of proteolytic digests of the conjugates formed, the reactivity of lysine residues in the protein was mapped and ranked. Computational analysis of the solvent accessibility of each lysine residue (based on the CRM197 crystal structure) established a correlation between reactivity and surface exposure. By this approach, conjugation involving lysine residues (normally a random process) can be controlled. It enables the preparation of lysine‐mediated glycoconjugates with improved batch‐to‐batch reproducibility, thereby producing neo‐glycoconjugates with more‐consistent biological activity. 相似文献
7.
安利路位于阿德莱德大城市地区南部近郊,它是澳大利亚大城市中相当常见的“中心大街”的一个缩影。本文通过南澳大利亚大学规划专业学生在社区调查基础上进行的项目研究,反映了安利路作为中心大街商业区的主要特征、对安利路形成竞争的因素、对安利路产生影响的问题,并探讨了从社区愿望出发对安利路进行改善的方法和管理战略。 相似文献
8.
A diffusion-based kinetic model for resin-based ion exchange is proposed that simultaneously describes extra- and intraparticle diffusion for the purpose of predicting batch transient adsorption rates during resin operation. The extraparticle diffusion is simulated through Newton's-law-of-cooling assuming a stagnant laminar layer, while the intraparticle simulation assumes a homogeneous internal pore environment and uses the Nernst–Planck equation to describe multi-ion diffusion. The key parameters of the model are the mass transfer coefficient, the intrinsic diffusivities of the adsorbing and desorbing ions and the equilibrium coefficient associated with the Mass-Action-Law, which is assumed to be applicable at the liquid/resin interface. A novel method is described to determine the critically important ion concentration at the interface from experiment. Kinetic tests are undertaken in a closed circuit system, adsorbing Na, Mg, and Ba ions separately onto gel type acid resin, and the simulation is fitted to the measured raw data using the Hook–Jeeves search algorithm. The intraparticle diffusivities of the three ions are hence measured and reported. 相似文献
9.
Noor Liyana Yusof Allan G. Rasmusson Federico Gómez Galindo 《Food and Bioprocess Technology》2016,9(8):1358-1366
Vacuum impregnation (VI) has been widely utilized as a pre-treatment method prior to, e.g., the minimal processing, freezing, or drying of foods. In many cases, VI has been used to focus on the enrichment of fruits and vegetables with probiotics or micronutrients, texture enhancement, the modification of the sensory attributes, and extension of shelf life by pH reduction. However, little attention has been paid to the exploration of the metabolic consequences of VI that could lead to changes in the quality characteristics of plant tissues. Since nitrate has long been discussed as a compound that is harmful to human health, the aim of this investigation was to reduce the nitrate content in spinach leaves by feeding sucrose into the tissue using VI. The leaves, either non-treated or treated with VI, were stored under saturated humidity conditions and in darkness at 8 °C, for up to 72 h. VI-treated leaves showed a remarkable reduction in nitrate content as compared to the non-treated samples. Upon storage, sucrose was reduced, indicating that this sugar had been respired and had induced metabolization of the stored nitrate. The nitrite content of the treated leaves was unaffected, proving that this toxic compound was not accumulated in the baby spinach leaves upon external sucrose feeding. 相似文献