全文获取类型
收费全文 | 143篇 |
免费 | 13篇 |
专业分类
电工技术 | 3篇 |
化学工业 | 56篇 |
机械仪表 | 2篇 |
建筑科学 | 4篇 |
矿业工程 | 1篇 |
能源动力 | 11篇 |
轻工业 | 22篇 |
无线电 | 13篇 |
一般工业技术 | 20篇 |
冶金工业 | 6篇 |
自动化技术 | 18篇 |
出版年
2023年 | 4篇 |
2022年 | 16篇 |
2021年 | 17篇 |
2020年 | 7篇 |
2019年 | 3篇 |
2018年 | 12篇 |
2017年 | 8篇 |
2016年 | 4篇 |
2015年 | 7篇 |
2014年 | 2篇 |
2013年 | 6篇 |
2012年 | 9篇 |
2011年 | 9篇 |
2010年 | 10篇 |
2009年 | 9篇 |
2008年 | 8篇 |
2007年 | 2篇 |
2005年 | 7篇 |
2004年 | 1篇 |
2003年 | 1篇 |
2002年 | 1篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1998年 | 2篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1985年 | 1篇 |
1965年 | 1篇 |
排序方式: 共有156条查询结果,搜索用时 0 毫秒
31.
32.
Mathilde Benveniste 《Energy Policy》1985,13(1):84-96
It is well established that the presence of a monopolist producer removes efficiency from the world oil market. Efficiency in energy resource utilization can nevertheless be the proclaimed objective of an energy policy by an oil-importing nation if imported oil is considered a non-produced resource available at a given price. This article presents an example of such a policy which consists of the institution of price guarantees for energy alternatives and of government subsidies for the development of new energy technologies. We illustrate how this policy will attain efficiency, and the ratio of benefits to the costs associated with its adoption are calculated. 相似文献
33.
Felipe A. P. de Figueiredo Fabiano Mathilde Dick Carrillo Ingrid Moerman 《Wireless Personal Communications》2018,98(1):293-309
This study proposes an uncooperative-multi-cell-multiple-input–multiple-output system to increase the throughput of an ill-conditioned wireless MIMO downlink system. The proposed algorithm suppresses the inter-cell interference at each mobile station using a set of adaptive receive beamformers, but handles the intra-cell interference at each base station using a Tomlinson Harashima precoder. Using the singular vectors of channel matrices, the receive beamformers can be designed based on a linear-constrained-minimum-variance criterion. On the other hand, to obtain high enough degree of freedoms for cancelling the intra-cell interference at each base station, the precoder is applied to the re-assembled downlink virtual channel formed by the simplified channel state information. Using the proposed interference suppression techniques, a multi-cell downlink system with multiple uncooperative base stations can be decomposed into a set of parallel subchannels. The resulting system has better performance in channel capacity than conventional MIMO systems. Computer simulations support the validity of the proposed approach. 相似文献
34.
Screening of antigenic vesicular fluid proteins of Echinococcus multilocularis as potential viability biomarkers to monitor drug response in alveolar echinococcosis patients 下载免费PDF全文
35.
Marcin Bienkowski Marek Chrobak Christoph Dürr Mathilde Hurand Artur Jeż Łukasz Jeż Grzegorz Stachowiak 《Algorithmica》2013,65(1):60-94
We consider online competitive algorithms for the problem of collecting weighted items from a dynamic queue S. The content of S varies over time. An update to S can occur between any two consecutive time steps, and it consists in deleting any number of items at the front of S and inserting other items into arbitrary locations in S. At each time step we are allowed to collect one item in S. The objective is to maximize the total weight of collected items. This is a generalization of bounded-delay packet scheduling (also known as buffer management). We present several upper and lower bounds on the competitive ratio for the general case and for some restricted variants of this problem. 相似文献
36.
Mathilde Chevreuil Anthony Nouy 《International journal for numerical methods in engineering》2012,89(2):241-268
A priori model reduction methods based on separated representations are introduced for the prediction of the low frequency response of uncertain structures within a parametric stochastic framework. The proper generalized decomposition method is used to construct a quasi‐optimal separated representation of the random solution at some frequency samples. At each frequency, an accurate representation of the solution is obtained on reduced bases of spatial functions and stochastic functions. An extraction of the deterministic bases allows for the generation of a global reduced basis yielding a reduced order model of the uncertain structure, which appears to be accurate on the whole frequency band under study and for all values of input random parameters. This strategy can be seen as an alternative to traditional constructions of reduced order models in structural dynamics in the presence of parametric uncertainties. This reduced order model can then be used for further analyses such as the computation of the response at unresolved frequencies or the computation of more accurate stochastic approximations at some frequencies of interest. Because the dynamic response is highly nonlinear with respect to the input random parameters, a second level of separation of variables is introduced for the representation of functions of multiple random parameters, thus allowing the introduction of very fine approximations in each parametric dimension even when dealing with high parametric dimension. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
37.
Szilvia Eosoly Nihal Engin Vrana Stefan Lohfeld Mathilde Hindie Lisa Looney 《Materials science & engineering. C, Materials for biological applications》2012,32(8):2250-2257
In the current study PCL/HA composites were fabricated using SLS as two- and three-dimensional lattice structures and exposed to a cellular component (MC 3T3 osteoblast-like cells). The main aims were to determine the mechanical differences due to powder composition and to observe the physical and mechanical changes pertaining to cell presence. These structures were characterized by compressive mechanical testing, and the effects of cell culturing and degradation on mechanical properties of the scaffolds with different PCL/HA compositions were determined. Moreover, changes in the scaffold morphology due to the cell culture conditions were determined by μ-CT analysis.Cells steadily grew on the scaffolds for 21 days with preferential distribution around the macropores and initially PCL/HA(15%) composites had higher cell numbers. Removal of loosely sintered parts was observable during the culturing period. Cell culture conditions did not change the compressive moduli significantly but had a distinct effect on compressive strength. For PCL/HA(15%) composites, an initial loss in strength caused by cell culture was reversed by longer cell exposure, with compressive strength of the structures restored to the initial properties (p ≤ 0.05). μ-CT measurements showed widespread morphological changes in the scaffolds, such as a decrease in the roughness of the struts. In general, in the initial period composites with lower HA content (15 wt.%) showed better metabolic activity compared to the higher HA content, however by day 14 the performance of the two compositions was equal. These results suggest that changes in sintering due to the differences in powder composition can have profound effects on the short and long term mechanical properties of the scaffold particularly under cell culture conditions, and this should be closely considered for SLS processing of scaffolds. 相似文献
38.
Causse M Friguet C Coiret C Lépicier M Navez B Lee M Holthuysen N Sinesio F Moneta E Grandillo S 《Journal of food science》2010,75(9):S531-S541
Although tomato flavor has not been a major goal for breeders, nowadays it becomes important as it is a subject of consumer complaint. A better knowledge of tomato consumer preferences, at the European level, should provide the basis for improvement of fruit quality and for market segmentation. In the framework of a large European project, 806 consumers from 3 countries, The Netherlands, France, and Italy, were presented with a set of 16 varieties representing the diversity of fresh tomato offer in order to evaluate their preferences. In parallel, sensory profiles were constructed by expert panels in each country. Preference maps were then constructed in each country revealing the structure of consumer preferences and allowing identification of the most important characteristics. Then a global analysis revealed that preferences were quite homogeneous across countries. This study identified the overall flavor and firmness as the most important traits for improving tomato fruit quality. It showed that consumer preferences from different European countries, with different cultures and food practices, are segmented following similar patterns when projected onto a common referential plan. Moreover, the results clearly showed that diversification of taste and texture is required to satisfy all consumers' expectations as some consumers preferred firm tomatoes, while others preferred melting ones and were more or less demanding in terms of sweetness and flavor intensity. Detailed comparisons also showed the importance of the fruit appearance in consumer preference. 相似文献
39.
Julien Danielle; Brault Mathilde; Chartrand élise; Bégin Jean 《Canadian Metallurgical Quarterly》2000,32(2):84
Examined whether the organization of positive behaviors during marital problem-solving discussion discriminated martially satisfied couples (MSCs) from maritally dissatisfied couples (MDCs). The mean age of men and women was, respectively, 33.9 and 32.8 yrs. 10 MSCs and 10 MDCs' interactions were coded with an observation system assessing partners' respective immediacy behaviors. The authors used sequential analyses to assess synchrony between the 2 partners' changes in levels of immediacy behaviors. The findings showed that, relative to MDCs, MSCs showed stronger associations between the 2 partners' respective changes in levels of immediacy behaviors. The results suggest that interactional synchrony is a useful framework for discriminating MSCs and MDCs' communication patterns. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
40.