全文获取类型
收费全文 | 90篇 |
免费 | 4篇 |
专业分类
综合类 | 1篇 |
化学工业 | 20篇 |
金属工艺 | 2篇 |
机械仪表 | 1篇 |
建筑科学 | 2篇 |
能源动力 | 2篇 |
轻工业 | 15篇 |
无线电 | 12篇 |
一般工业技术 | 18篇 |
冶金工业 | 1篇 |
自动化技术 | 20篇 |
出版年
2023年 | 3篇 |
2022年 | 4篇 |
2021年 | 2篇 |
2019年 | 2篇 |
2018年 | 2篇 |
2017年 | 2篇 |
2016年 | 1篇 |
2015年 | 2篇 |
2014年 | 2篇 |
2013年 | 6篇 |
2012年 | 7篇 |
2011年 | 7篇 |
2010年 | 7篇 |
2009年 | 5篇 |
2008年 | 6篇 |
2007年 | 7篇 |
2006年 | 5篇 |
2005年 | 6篇 |
2004年 | 3篇 |
2003年 | 3篇 |
2002年 | 1篇 |
2001年 | 4篇 |
2000年 | 1篇 |
1998年 | 1篇 |
1997年 | 2篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有94条查询结果,搜索用时 31 毫秒
1.
Networks and Spatial Economics - This paper analyzes the socio-economic dimension of vulnerability and resilience from the viewpoint of connectivity. While no consensus has yet emerged on... 相似文献
2.
Casalaro Giuseppina Lucia Cattivera Giulio Ciccozzi Federico Malavolta Ivano Wortmann Andreas Pelliccione Patrizio 《Software and Systems Modeling》2022,21(1):19-49
Software and Systems Modeling - Mobile robots operate in various environments (e.g. aquatic, aerial, or terrestrial), they come in many diverse shapes and they are increasingly becoming parts of... 相似文献
3.
Anubhav Jain Ivano E. Castelli Geoffroy Hautier David H. Bailey Karsten W. Jacobsen 《Journal of Materials Science》2013,48(19):6519-6534
We examine the performance of genetic algorithms (GAs) in uncovering solar water light splitters over a space of almost 19,000 perovskite materials. The entire search space was previously calculated using density functional theory to determine solutions that fulfill constraints on stability, band gap, and band edge position. Here, we test over 2500 unique GA implementations in finding these solutions to determine whether GA can avoid the need for brute force search, and thereby enable larger chemical spaces to be screened within a given computational budget. We find that the best GAs tested offer almost a 6 times efficiency gain over random search, and are comparable to the performance of a search based on informed chemical rules. In addition, the GA is almost 10 times as efficient as random search in finding half the solutions within the search space. By employing chemical rules, the performance of the GA can be further improved to approximately 12–17 better than random search. We discuss the effect of population size, selection function, crossover function, mutation rate, fitness function, and elitism on the final result, finding that selection function and elitism are especially important to GA performance. In addition, we determine that parameters that perform well in finding solar water splitters can also be applied to discovering transparent photocorrosion shields. Our results indicate that coupling GAs to high-throughput density functional calculations presents a promising method to rapidly search large chemical spaces for technological materials. 相似文献
4.
Francesco Losurdo Alessandro Marra Ernesto Cassetta Umberto Monarca Ivano Dileo Vittorio Carlei 《Papers in Regional Science》2019,98(2):737-753
In order to overcome the limitations of defining industrial specializations in digital industries through SIC codes, this paper suggests measuring the specializations and competences of these industries on the basis of the degree of digital technologies present in the products and services supplied. Metadata from CrunchBase are employed, as proxies of firms' specializations and competences which are defined as the fields of activity in which firms are involved. Applying a network analysis, these specializations and competences are linked to the recognition of emerging digital technologies and the strongest combinations of products and services. We tested the proposed methodology on London, a leading centre for the digital economy. 相似文献
5.
Ivano Camoni Riccardo Fabbrini Leonello Attias Alfonso Di Muccio Elvira Cecere Antonio Consolino Francesca Roberti 《Food Additives & Contaminants》2001,18(10):932-936
In 1997 the Italian monitoring programme for pesticide residues in food comprised 7951 samples of 152 different foods for which a total of 275 pesticides were analysed. For 90 pesticides, the National Estimated Daily Intakes (NEDIs) were calculated by using the 90th percentile value and the food consumption data for the general Italian population. The calculated NEDIs were found to represent only a small portion of the respective Acceptable Daily Intake (ADI). 相似文献
6.
7.
Raphael Pfattner Marta Mas‐Torrent Ivano Bilotti Aldo Brillante Silvia Milita Fabiola Liscio Fabio Biscarini Tomasz Marszalek Jacek Ulanski Andrzej Nosal Maciej Gazicki‐Lipman Michael Leufgen Georg Schmidt Laurens W. Molenkamp Vladimir Laukhin Jaume Veciana Concepció Rovira 《Advanced materials (Deerfield Beach, Fla.)》2010,22(37):4198-4203
8.
Hen’s egg lysozyme (LYZ) is added to red wine for preventing malolactic activity. Sulphur dioxide and polyphenolic compounds can depress LYZ solubility and effectiveness, likely by sulphonation of enzyme disulphide bonds or protein binding, respectively. These phenomena were evaluated in either young red wine or model wine systems. A reliable and validated HPLC method was first developed in order to quantify soluble LYZ in wine (r95% = 10.7 mg l−1). The amount of insolubilized LYZ in red wine was related to the content of non-anthocyan flavonoids of low molecular weight and enzyme precipitation occurred in few minutes when flavonoid concentration exceeded 50 mg l−1. Interaction between sulphur dioxide and LYZ occurred in polyphenol-free model wine systems and for the first time the formation of mono-thiosulphonated LYZ was demonstrated. This reaction was favoured by increasing pH value and sulphur dioxide concentration. Nevertheless, sulphonation alone did not fully explain LYZ instability in model wine systems. 相似文献
9.
Ivano Caprioli Michael O’Sullivan Frank J. Monahan 《European Food Research and Technology》2009,228(3):433-440
The objective of this study was to investigate the influence of sodium caseinate films containing glycerol [glycerol:protein
ratio 0.32 (w/w)] on lipid oxidation in cooked turkey breast meat slices. Slices were wrapped in films of different thickness
(22, 42, and 58 μm) and were stored at 4 °C for 1, 2, 3 and 4 days. Lipid oxidation was measured using TBARS and hexanal assays
on each day of storage while an olfactory sensory analysis was carried out on all the samples after 4 days of storage. TBARS
values and hexanal levels of unwrapped samples (~6.0 mg MDA/kg and ~8.0 mg hexanal/kg) were significantly (P ≤ 0.05) higher than those of the casein film wrapped samples (~3.0 mg MDA/kg and ~3.0 mg hexanal/kg). Sensory analysis also
showed significant (P ≤ 0.05) differences between wrapped samples and unwrapped samples, the former being perceived as less rancid. Thus wrapping
in caseinate films may help reduce lipid oxidation in cooked turkey meat. 相似文献
10.
A product line architecture is a single specification capturing the overall architecture of a series of closely related products. Its structure consists of a set of mandatory elements and a set of variation points. Whereas mandatory elements are part of the architecture of every product in the product line architecture, variation points precisely define the dimensions along which the architectures of individual products differ from each other.The increased use of product line architectures in today's software development projects poses several challenges for existing testing techniques. In this paper we discuss those challenges and discuss what we believe are opportunities for addressing them. 相似文献