全文获取类型
收费全文 | 94篇 |
免费 | 1篇 |
专业分类
化学 | 25篇 |
力学 | 21篇 |
数学 | 13篇 |
物理学 | 36篇 |
出版年
2021年 | 3篇 |
2018年 | 1篇 |
2016年 | 3篇 |
2015年 | 1篇 |
2014年 | 2篇 |
2013年 | 5篇 |
2012年 | 4篇 |
2011年 | 3篇 |
2010年 | 6篇 |
2009年 | 3篇 |
2008年 | 6篇 |
2007年 | 3篇 |
2006年 | 1篇 |
2005年 | 5篇 |
2004年 | 5篇 |
2003年 | 8篇 |
2002年 | 1篇 |
2001年 | 4篇 |
2000年 | 1篇 |
1999年 | 2篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 4篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1989年 | 2篇 |
1988年 | 5篇 |
1987年 | 4篇 |
1983年 | 1篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1976年 | 1篇 |
1885年 | 1篇 |
排序方式: 共有95条查询结果,搜索用时 15 毫秒
11.
Auger electron spectroscopy (AES), low energy electron diffraction (LEED) and work function (Kelvin probe) measurements have been used to study the initial interaction of clean Al(111), (100) and (110) surfaces with oxygen at room temperature. The oxidation process was found to be surface orientation dependent, but a common feature has been always observed on the three low-index surfaces: they show two distinct phases, i.e. a chemisorbed phase followed then by an oxidized phase. From analysis of AES, LEED and Kelvin probe results, an adsorption mechanism of O on Al for each surface orientation is proposed. 相似文献
12.
Jean-Charles Boisson Laetitia Jourdan El-Ghazali Talbi Dragos Horvath 《Journal of Mathematical Modelling and Algorithms》2010,9(2):195-208
In this article, the impact of single-objective methods as intensification factors in a multi-objective approach is presented
for the flexible docking problem. Based on a novel tri-objective model, a parallel multi-objective genetic algorithm has been
designed. However, due to the high variability of the energy objective, intensification methods focused on this objective
have been also included in order to improve the convergence speed of the genetic algorithm and the quality of the results.
The corresponding approach, combining single- and multi-objective methods, has been proved efficient according to the tested
instances and the quality criterion used. 相似文献
13.
Marie-Éléonore Marmion Laetitia Jourdan Clarisse Dhaenens 《Journal of Mathematical Modelling and Algorithms》2013,12(1):3-26
Landscape analysis has been identified as a promising way to develop efficient optimization methods. Nevertheless, the links between properties of the landscape and efficiency of methods is not easy to understand. In this article, we propose to give a contribution in this field using a vehicle routing problem as an illustration. Metaheuristics use a neighborhood operator that connects solutions of the search space. Thus, this operator acts on the dynamics of the search and impacts metaheuristics efficiency. Therefore, we characterize two landscapes differenciated by their neighborhood function and then, we analyze the performance of classical metaheuristics using one or the other neighborhood operator. Finally, a discussion provides insights on the relations between results of the landscape analysis and results of methods performance. 相似文献
14.
This “in situ” and real time study is an approach to the role of matrix dislocations in the nucleation of the α or β phases in titanium single crystals. When the dislocations interact, forming tangles, subboundaries…, the residual stresses, present at the transformation temperature, trigger the new phase. If the dislocations are isolated at the transformation temperature they are destabilized by the large crystalline anisotropy resulting from the vibrational entropy dependence with the temperature. These dislocations disappear and do no act as preferential nucleation sites. 相似文献
15.
Sébastien Verel Arnaud Liefooghe Laetitia Jourdan Clarisse Dhaenens 《European Journal of Operational Research》2013
The structure of the search space explains the behavior of multiobjective search algorithms, and helps to design well-performing approaches. In this work, we analyze the properties of multiobjective combinatorial search spaces, and we pay a particular attention to the correlation between the objective functions. To do so, we extend the multiobjective NK-landscapes in order to take the objective correlation into account. We study the co-influence of the problem dimension, the degree of non-linearity, the number of objectives, and the objective correlation on the structure of the Pareto optimal set, in terms of cardinality and number of supported solutions, as well as on the number of Pareto local optima. This work concludes with guidelines for the design of multiobjective local search algorithms, based on the main fitness landscape features. 相似文献
16.
17.
Thomas Jourdan Frédéric Lançon Laurent Vila 《Journal of magnetism and magnetic materials》2009,321(14):2187-2191
FePt thin layers have been epitaxied either on Pt(0 0 1) or on MgO(0 0 1) substrates, and magnetically characterized using extraordinary Hall effect magnetometry and magnetic force microscopy. The coercivity originates in both cases from the pinning of domain walls on structural defects. Whereas the coercivity increases with the FePt layer thickness in FePt/Pt samples, it decreases in FePt/MgO samples. This discrepancy is explained on the basis of structural observations, and of atomistic simulations of magnetic domain wall pinning. 相似文献
18.
19.
Fomin N Arrington J Asaturyan R Benmokhtar F Boeglin W Bosted P Bruell A Bukhari MH Christy ME Chudakov E Clasie B Connell SH Dalton MM Daniel A Day DB Dutta D Ent R El Fassi L Fenker H Filippone BW Garrow K Gaskell D Hill C Holt RJ Horn T Jones MK Jourdan J Kalantarians N Keppel CE Kiselev D Kotulla M Lindgren R Lung AF Malace S Markowitz P McKee P Meekins DG Mkrtchyan H Navasardyan T Niculescu G Opper AK Perdrisat C Potterveld DH Punjabi V Qian X Reimer PE Roche J Rodriguez VM Rondon O 《Physical review letters》2012,108(9):092502
We present new measurements of electron scattering from high-momentum nucleons in nuclei. These data allow an improved determination of the strength of two-nucleon correlations for several nuclei, including light nuclei where clustering effects can, for the first time, be examined. The data also include the kinematic region where three-nucleon correlations are expected to dominate. 相似文献
20.
Arnaud Liefooghe Jérémie Humeau Salma Mesmoudi Laetitia Jourdan El-Ghazali Talbi 《Journal of Heuristics》2012,18(2):317-352
This paper discusses simple local search approaches for approximating the efficient set of multiobjective combinatorial optimization
problems. We focus on algorithms defined by a neighborhood structure and a dominance relation that iteratively improve an
archive of nondominated solutions. Such methods are referred to as dominance-based multiobjective local search. We first provide
a concise overview of existing algorithms, and we propose a model trying to unify them through a fine-grained decomposition.
The main problem-independent search components of dominance relation, solution selection, neighborhood exploration and archiving
are largely discussed. Then, a number of state-of-the-art and original strategies are experimented on solving a permutation
flowshop scheduling problem and a traveling salesman problem, both on a two- and a three-objective formulation. Experimental
results and a statistical comparison are reported in the paper, and some directions for future research are highlighted. 相似文献