全文获取类型
收费全文 | 705篇 |
免费 | 41篇 |
专业分类
电工技术 | 6篇 |
化学工业 | 195篇 |
金属工艺 | 12篇 |
机械仪表 | 16篇 |
建筑科学 | 15篇 |
能源动力 | 14篇 |
轻工业 | 90篇 |
水利工程 | 6篇 |
石油天然气 | 5篇 |
无线电 | 89篇 |
一般工业技术 | 105篇 |
冶金工业 | 86篇 |
原子能技术 | 3篇 |
自动化技术 | 104篇 |
出版年
2024年 | 8篇 |
2023年 | 9篇 |
2022年 | 30篇 |
2021年 | 41篇 |
2020年 | 24篇 |
2019年 | 41篇 |
2018年 | 39篇 |
2017年 | 25篇 |
2016年 | 36篇 |
2015年 | 25篇 |
2014年 | 23篇 |
2013年 | 49篇 |
2012年 | 38篇 |
2011年 | 55篇 |
2010年 | 14篇 |
2009年 | 31篇 |
2008年 | 17篇 |
2007年 | 21篇 |
2006年 | 17篇 |
2005年 | 15篇 |
2004年 | 14篇 |
2003年 | 14篇 |
2002年 | 13篇 |
2001年 | 15篇 |
2000年 | 8篇 |
1999年 | 10篇 |
1998年 | 27篇 |
1997年 | 19篇 |
1996年 | 15篇 |
1995年 | 6篇 |
1994年 | 4篇 |
1993年 | 4篇 |
1992年 | 5篇 |
1991年 | 3篇 |
1990年 | 2篇 |
1989年 | 6篇 |
1988年 | 4篇 |
1985年 | 4篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1981年 | 1篇 |
1979年 | 2篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1969年 | 1篇 |
1965年 | 1篇 |
排序方式: 共有746条查询结果,搜索用时 15 毫秒
21.
Celina M.H. de Figueiredo Guilherme D. da Fonseca Vinicius G.P. de Sa Jeremy Spinrad 《Algorithmica》2006,46(2):149-180
A homogeneous set is a non-trivial module of a graph, i.e. a non-empty,
non-unitary, proper subset of a graph's vertices such that all its elements
present exactly the same outer neighborhood. Given two graphs
the Homogeneous Set Sandwich Problem (HSSP) asks whether there
exists a sandwich graph
which
has a homogeneous set. In 2001 Tang et al. published
an all-fast
algorithm which was recently proven wrong, so that the HSSP's known upper bound would have been reset
thereafter at the former
determined by Cerioli et al. in 1998. We present, notwithstanding, new deterministic
algorithms which have it established at
We give as
well two even faster
randomized algorithms, whose simplicity might
lend them didactic usefulness. We believe that, besides providing efficient
easy-to-implement procedures to solve it, the study of these new approaches
allows a fairly thorough understanding of the problem. 相似文献
22.
23.
Maria Helena Santos Rafael M. Silva Vitor C. Dumont Juliana S. Neves Herman S. Mansur Luiz Guilherme D. Heneine 《Materials science & engineering. C, Materials for biological applications》2013,33(2):790-800
Bovine pericardium is widely used as a raw material in bioengineering as a source of collagen, a fundamental structural molecule. The physical, chemical, and biocompatibility characteristics of these natural fibers enable their broad use in several areas of the health sciences. For these applications, it is important to obtain collagen of the highest possible purity. The lack of a method to produce these pure biocompatible materials using simple and economically feasible techniques presents a major challenge to their production on an industrial scale. This study aimed to extract, purify, and characterize the type I collagen protein originating from bovine pericardium, considered to be an abundant tissue resource. The pericardium tissue was collected from male animals at slaughter age. Pieces of bovine pericardium were enzymatically digested, followed by a novel protocol developed for protein purification using ion-exchange chromatography. The material was extensively characterized by electrophoresis, scanning electron microscopy, energy dispersive X-ray spectroscopy, and infrared spectroscopy. The results showed a purified material with morphological properties and chemical functionalities compatible with type I collagen and similar to a highly purified commercial collagen. Thus, an innovative and relatively simple processing method was developed to extract and purify type I collagen from bovine tissue with potential applications as a biomaterial for regenerative tissue engineering. 相似文献
24.
25.
Guilherme Galante Luis Carlos Erpen De Bona Antonio Roberto Mury Bruno Schulze Rodrigo da Rosa Righi 《Journal of Grid Computing》2016,14(2):193-216
Elasticity can be seen as the ability of a system to increase or decrease the computing resources allocated in a dynamic and on demand way. It is an important feature provided by cloud computing, that has been widely used in web applications and is also gaining attention in the scientific community. Considering the possibilities of using elasticity in this context, a question arises: “Are the available public cloud solutions suitable to provide elasticity to scientific applications?” To answer the question, in a first moment we present a survey on the use of cloud computing in scientific scenarios, providing an overview of the subject. Next, we describe the elasticity mechanisms offered by major public cloud providers and analyzes the limitations of the solutions in providing elasticity for scientific applications. As the main contribution of the article, we also present an analysis over some initiatives that are being developed to overcome the current challenges. In our opinion, current computational clouds are developing rapidly but have not yet reached the necessary maturity level to meet all scientific applications elasticity requirements. We expect that in the coming years the efforts being taken by numerous researchers in this area identify and address these challenges and lead to better and more mature technologies that will improve cloud computing practices. 相似文献
26.
Biosynthesis and purification of histidine‐tagged human soluble catechol‐O‐methyltransferase 下载免费PDF全文
27.
28.
Tactic planning or master production scheduling focuses on time and spatial decomposition of the aggregate planning targets and forecasts, as well as, forecast and provision of needed resources. This process becomes extremely hard and time consuming with the increase of number of products, resources and periods considered. In face of such obstacles, this work shows a study of an Artificial Intelligence technique called Simulated Annealing applied to the optimization of production planning problem, more specifically, Master Production Scheduling. This work reviews some of the fundamental theory of simulated annealing, the methodology for master production scheduling calculation, the applicability of simulating annealing to planning problems, most important results and suggestions for further studies. 相似文献
29.
30.
Our previous work identified thermal instability of p-type skutterudite as a primary cause of degradation during thermoelectric generator operation at 650°C. Residual Sb in the microstructure was believed to be the cause of diminished thermal stability, especially above the melting point of Sb (631°C). This work investigated addition of Nb to p-type skutterudite to from NbSb2, thus scavenging elemental Sb. The results of this work are reported, along with comprehensive thermoelectric property characterization of the p-type skutterudite?+?NbSb2 composites. 相似文献