996 resultados para Trä


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In this article we describe the methodology developed for the semiautomatic annotation of EPEC-RolSem, a Basque corpus labeled at predicate level following the PropBank-VerbNet model. The methodology presented is the product of detailed theoretical study of the semantic nature of verbs in Basque and of their similarities and differences with verbs in other languages. As part of the proposed methodology, we are creating a Basque lexicon on the PropBank-VerbNet model that we have named the Basque Verb Index (BVI). Our work thus dovetails the general trend toward building lexicons from tagged corpora that is clear in work conducted for other languages. EPEC-RolSem and BVI are two important resources for the computational semantic processing of Basque; as far as the authors are aware, they are also the first resources of their kind developed for Basque. In addition, each entry in BVI is linked to the corresponding verb-entry in well-known resources like PropBank, VerbNet, WordNet, Levin’s Classification and FrameNet. We have also implemented several automatic processes to aid in creating and annotating the BVI, including processes designed to facilitate the task of manual annotation.

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Background: While pain is frequently associated with unipolar depression, few studies have investigated the link between pain and bipolar depression. In the present study we estimated the prevalence and characteristics of pain among patients with bipolar depression treated by psychiatrists in their regular clinical practice. The study was designed to identify factors associated with the manifestation of pain in these patients.- Methods:Patients diagnosed with bipolar disorder (n=121) were selected to participate in a cross-sectional study in which DSM-IV-TR criteria were employed to identify depressive episodes. The patients were asked to describe any pain experienced during the study, and in the 6 weeks beforehand, by means of a Visual Analogical Scale (VAS).- Results: Over half of the bipolar depressed patients (51.2%, 95% CI: 41.9%–60.6%), and 2/3 of the female experienced concomitant pain. The pain was of moderate to severe intensity and prolonged duration, and it occurred at multiple sites, significantly limiting the patient’s everyday activities. The most important factors associated with the presence of pain were older age, sleep disorders and delayed diagnosis of bipolar disorder.- Conclusions: Chronic pain is common in bipolar depressed patients, and it is related to sleep disorders and delayed diagnosis of their disorder. More attention should be paid to study the presence of pain in bipolar depressed patients, in order to achieve more accurate diagnoses and to provide better treatment options.

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This book elucidates the methods of molecular gas dynamics or rarefied gas dynamics which treat the problems of gas flows when the discrete molecular effects of the gas prevail under the circumstances of low density, the emphases being stressed on the basis of the methods, the direct simulation Monte Carlo method applied to the simulation of non-equilibrium effects and the frontier subjects related to low speed microscale rarefied gas flows. It provides a solid basis for the study of molecular gas dynamics for senior students and graduates in the aerospace and mechanical engineering departments of universities and colleges. It gives a general acquaintance of modern developments of rarefied gas dynamics in various regimes and leads to the frontier topics of non-equilibrium rarefied gas dynamics and low speed microscale gas dynamics. It will be also of benefit to the scientific and technical researchers engaged in aerospace high altitude aerodynamic force and heating design and in the research on gas flow in MEMS

  • 目次内容                                                                
[1]  Molecular structure and energy states (21)  
 
[2]  Some basic concepts of kinetic theory (51)  
 
[3]  Interaction of molecules with solid surface (131)  
 
[4]  Free molecular flow (159)  
 
[5]  Continuum models (191)  
 
[6]  Transitional regime (231)  
 
[7]  Direct simulation Monte-Carlo (DSMC) method (275)  
 
[8]  Microscale slow gas flows, information preservation method (317)  
 
[App. I]  Gas properties (367)  
 
[App. II]  Some integrals (369)  
 
[App. III]  Sampling from a prescribed distribution (375)  
 
[App. IV]  Program of the couette flow (383)  
 
Subject Index (399)  

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    本书为祝贺郑哲敏先生八十华诞的学术报告会的文集,其中收录邀请报告12篇,定向征文58篇。这些论文涉及爆炸力学、岩土力学、冲击力学、材料力学性能、生物力学、物理力学、海洋工程力学、环境流体力学等几大方面,绝大多数为论文作者科研项目的最新成果。

 

会议论文
 
  洪友士;        
内禀Deborah数在破坏现象中的意义   白以龙;汪海英;        
爆炸波在混凝土夹层结构中传播特性分析   段祝平;        
海洋内波与海洋工程   李家春;程友良;范平;        
郑哲敏先生为推动我国力学和技术科学发展所作的贡献   谈庆明;        
开发深海资源的海底空间站技术   曾恒一;        
微系统动力学研究的一些新进展   赵亚溥;        
爆炸近区空气冲击波规则反射和非规则反射   周丰峻;陈叶青;任辉启;        
椭圆函数的精细积分算法   钟万勰;姚征;        
量子蒙特卡罗法的研究   孙祉伟;        
拟Hamilton系统随机平均法在活性布朗粒子动力学研究中的应用   朱位秋;邓茂林;        
二个二阶张量的各向同性标量函数的广义坐标   王文标;段祝平;        
弹性杆轴向碰撞波动问题理论分析   马炜;刘才山;黄琳;        
两个可变形结构的相互碰撞——模型与验证   余同希;阮海辉;        
结构动力计算中自由度减缩方法概述   刘彬;丁桦;梁乃刚;        
弹塑性系统动力行为探讨   杨桂通;        
SINGULARITY THEORY ON BUCKLING OF COMPRESSIBLE ELASTIC SLENDER RODS   张义同;谢宇新;        
GCr15钢超高周疲劳断口观察与裂纹起源分析   周承恩;洪友士;        
纳米尺度毛细作用学——纳米物理力学的新领域   朱如曾;        
METALLIC CELLULAR SOLIDS UNDER IMPACT LOADING   H.Zhao;S.Abdennadher;I.Elnasri;    
 
 
 
 

 

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Adiabatic shear localization is a mode of failure that occurs in dynamic loading. It is characterized by thermal softening occurring over a very narrow region of a material and is usually a precursor to ductile fracture and catastrophic failure. This reference source is the first detailed study of the mechanics and modes of adiabatic shear localization in solids, and provides a systematic description of a number of aspects of adiabatic shear banding. The inclusion of the appendices which provide a quick reference section and a comprehensive collection of thermomechanical data allows rapid access and understanding of the subject and its phenomena. The concepts and techniques described in this work can usefully be applied to solve a multitude of problems encountered by those investigating fracture and damage in materials, impact dynamics, metal working and other areas. This reference book has come about in response to the pressing demand of mechanical and metallurgical engineers for a high quality summary of the knowledge gained over the last twenty years. While fulfilling this requirement, the book is also of great interest to academics and researchers into materials performance.

Table of Contents

1Introduction1
1.1What is an Adiabatic Shear Band?1
1.2The Importance of Adiabatic Shear Bands6
1.3Where Adiabatic Shear Bands Occur10
1.4Historical Aspects of Shear Bands11
1.5Adiabatic Shear Bands and Fracture Maps14
1.6Scope of the Book20
2Characteristic Aspects of Adiabatic Shear Bands24
2.1General Features24
2.2Deformed Bands27
2.3Transformed Bands28
2.4Variables Relevant to Adiabatic Shear Banding35
2.5Adiabatic Shear Bands in Non-Metals44
3Fracture and Damage Related to Adiabatic Shear Bands54
3.1Adiabatic Shear Band Induced Fracture54
3.2Microscopic Damage in Adiabatic Shear Bands57
3.3Metallurgical Implications69
3.4Effects of Stress State73
4Testing Methods76
4.1General Requirements and Remarks76
4.2Dynamic Torsion Tests80
4.3Dynamic Compression Tests91
4.4Contained Cylinder Tests95
4.5Transient Measurements98
5Constitutive Equations104
5.1Effect of Strain Rate on Stress-Strain Behaviour104
5.2Strain-Rate History Effects110
5.3Effect of Temperature on Stress-Strain Behaviour114
5.4Constitutive Equations for Non-Metals124
6Occurrence of Adiabatic Shear Bands125
6.1Empirical Criteria125
6.2One-Dimensional Equations and Linear Instability Analysis134
6.3Localization Analysis140
6.4Experimental Verification146
7Formation and Evolution of Shear Bands155
7.1Post-Instability Phenomena156
7.2Scaling and Approximations162
7.3Wave Trapping and Viscous Dissipation167
7.4The Intermediate Stage and the Formation of Adiabatic Shear Bands171
7.5Late Stage Behaviour and Post-Mortem Morphology179
7.6Adiabatic Shear Bands in Multi-Dimensional Stress States187
8Numerical Studies of Adiabatic Shear Bands194
8.1Objects, Problems and Techniques Involved in Numerical Simulations194
8.2One-Dimensional Simulation of Adiabatic Shear Banding199
8.3Simulation with Adaptive Finite Element Methods213
8.4Adiabatic Shear Bands in the Plane Strain Stress State218
9Selected Topics in Impact Dynamics229
9.1Planar Impact230
9.2Fragmentation237
9.3Penetration244
9.4Erosion255
9.5Ignition of Explosives261
9.6Explosive Welding268
10Selected Topics in Metalworking273
10.1Classification of Processes273
10.2Upsetting276
10.3Metalcutting286
10.4Blanking293
 Appendices297
AQuick Reference298
BSpecific Heat and Thermal Conductivity301
CThermal Softening and Related Temperature Dependence312
DMaterials Showing Adiabatic Shear Bands335
ESpecification of Selected Materials Showing Adiabatic Shear Bands341
FConversion Factors357
 References358
 Author Index369
 Subject Index375

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本书收录关于力学领域的论文301篇。内容包括:回顾20世纪力学在中国的发展,描绘了2000年中国和世界在力学各主要领域的发展现状;展望力学在21世纪的发展方向,探论新世纪中可能面临的新的重大力学等问题。

前言 白以龙;杨卫;  
力学学科《学科发展与优先领域战略研究报告》   
世纪之交对力学的回顾、展望和想象 白以龙;  
计算流体力学中发展物理分析的几个问题 张涵信;李沁;宗文刚;张来平;  
非对称Riccati方程基于本征解的分析解 钟万勰;  
实验固体力学近几年的概况 伍小平;  
HIGHER-ORDER COHESIVE ELASTICITY THEORIES OF FRACTURE Anna Vainchtein;  
疲劳短裂纹群体损伤随机特征研究 洪友士;郑亮;乔宇;  
半浮区热毛细对流及其不稳定性机理 胡文瑞;唐泽眉;  
ZONAL AND CORRELATION ANALYSIS IN SWEPT SHOCK/BOUNDARY LAYER INTERACTIONS 邓学蓥;  
经典约束系统动力学的研究进展 梅凤翔;  
复杂系统的非线性动力学问题 陆启韶;  
时滞受控系统动力学研究进展 胡海岩;王在华;  
力学与航天器工程 马兴瑞;苟兴宇;周志成;  
采矿工程中的力学问题与分析 谢和平;  
CHALLENGING PROBLEMS IN FAILURE ANALYSIS OF DUAL-PHASE MATERIALS: CYCLIC MICRO-PLASTICITY AND SMALL FATIGUE CRACK TIP BEHAVIOR   
力学与国防科技 周丰峻;  
流体力学和气动热弹性力学新一代反命题的研究 刘高联;  
含灰气体近壁区流动及传热增强机制分析 王柏懿;戚隆溪;王超;江先金;  
三维定常、二维非定常分离模式及准则研究 吕志咏;

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本书收录会议论文60篇。

  本书内容大体分为三类。一类着重介绍了钱学森先生的风范,他的爱国主义,他的勤奋好学,他的治学精神和治学态度,他在学术上的重大贡献以及他的科学思想。第二类是介绍在他的领导或影响下,五十年来我国力学研究取得的成就及进一步的进展。第三类涉及我国力学界正在开展的其他方面的学术研究进展。我们的共同目的是继承优良传统,开拓我国力学在新世纪的发展。

  读者对象:力学、航空航天、机械等领域的工程技术人员,研究人员。

会议论文
 
学习钱学森先生技术科学思想的体会 郑哲敏;  
国家目标与技术科学——钱学森的力学研究所建所思想 吴承康;  
钱学森和中国空气动力研究与发展中心 焦安昌;钮颂镛;  
钱学森教授与近代力学教育   
钱学森开创的物理力学之路 朱如曾;  
工程结构优化设计 钱令希;  
压电类智能材料与结构的力学分析 余寿文;沈亚鹏;匡震邦;  
一般力学(动力学、振动与控制)研究动态与发展趋势 黄文虎;胡超;  
力学系统控制的几个问题 黄琳;  
与物理分析相结合的计算流体力学 张涵信;庄逢甘;  
烧蚀防热的非线性气固耦合 姜贵庆;  
湍流的复杂系统论 佘振苏;程雪玲;  
纳米力学进展 杨卫;郑泉水;方岱宁;黄克智;  
从简单系统的定量分析到复杂巨系统的综合集成 庄逢甘;黄志澄;  
关于力学研究的方法论问题 童秉纲;  
哈密顿原理中时端条件的处理方法及其推广 刘高联;  
ASYMMETRIC VORTEX FLOW OVER SLENDER BODIES 罗时钧;  
亚、超声喷管中声传播的数值模拟 高军辉;李晓东;  
格子Boltzmann数值流体力学 冯士德;毛江玉;任荣彩;  
微型飞行器的仿生流体力学——昆虫产生高升力的机理 孙茂;唐剑;

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En los últimos años, las Guías Clínicas basadas en la revisión sistemática de la evidencia científica se han convertido en un vehículo esencial para la transferencia efectiva del conocimiento médico a la atención primaria. Sin embargo, su difusión no ha sido todo lo efectiva que hubiera sido deseable. En este contexto aparece Aide Portal (www.aide-portal.ehu.es), el primer portal de habla hispana de Guías Clínicas Informa-tizadas ejecutables. Aide Portal facilita la asimilación del conocimiento contenido en guías clínicas, ya que ofrece múltiples funcionalidades como la particularización de las recomendaciones proporcionadas por las guías a pacientes concretos, la conexión con sistemas de Historia Clínica Electrónica o el acceso a informa-ción terminológica, bibliográfica y farmacológica en tiempo real. En este informe detalla paso a paso cómo extraer el máximo rendimiento de todas las funcionalidades que ofrece Aide Portal, y resultará de especial ayuda a aquellos profesionales del ámbito sanitario que deseen familiarizarse con el mismo.

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En los últimos años, las Guías Clínicas basadas en la revisión sistemática de la evidencia científica se han convertido en un vehículo esencial para la transferencia efectiva del conocimiento médico a la atención primaria. Sin embargo, su difusión no ha sido todo lo efectiva que hubiera sido deseable. En este contexto aparece Aide Portal (www.aide-portal.ehu.es), el primer portal de habla hispana de Guías Clínicas Informatizadas ejecutables. Aide Portal facilita la asimilación del conocimiento contenido en guías clínicas, ya que ofrece múltiples funcionalidades como la particularización de las recomendaciones proporcionadas por las guías a pacientes concretos, la conexión con sistemas de Historia Clínica Electrónica o el acceso a información terminológica, bibliográfica y farmacológica en tiempo real. Este informe recoge de forma detallada cómo llevar a cabo la administración y gestión tanto de las Guías Clínicas Informatizadas desplegadas en Aide Portal, cómo de los distintos usuarios que acceden a las mismas y a todas las funcionalidades que se les ofrecen.

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[EU]Lan honetan, adibideetan oinarritutako patroi batzuk sortu ditugu, erregeletan oinarritutako itzulpen-sistema automatiko bat hobetzeko asmoz. Patroirik erabilgarrienak emango zituzten adibideak bakarrik hartzeko, euren erabilera-maiztasunari eta itzulpen automatikoen egokitasunari erreparatu diegu. Ondoren, adibideetako entitate-izenak eta zenbakiak orokortu ditugu, elementu horiek aldatuta ere, patroiak erabili ahal izateko.

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Accurate and fast decoding of speech imagery from electroencephalographic (EEG) data could serve as a basis for a new generation of brain computer interfaces (BCIs), more portable and easier to use. However, decoding of speech imagery from EEG is a hard problem due to many factors. In this paper we focus on the analysis of the classification step of speech imagery decoding for a three-class vowel speech imagery recognition problem. We empirically show that different classification subtasks may require different classifiers for accurately decoding and obtain a classification accuracy that improves the best results previously published. We further investigate the relationship between the classifiers and different sets of features selected by the common spatial patterns method. Our results indicate that further improvement on BCIs based on speech imagery could be achieved by carefully selecting an appropriate combination of classifiers for the subtasks involved.

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The Linear Ordering Problem is a popular combinatorial optimisation problem which has been extensively addressed in the literature. However, in spite of its popularity, little is known about the characteristics of this problem. This paper studies a procedure to extract static information from an instance of the problem, and proposes a method to incorporate the obtained knowledge in order to improve the performance of local search-based algorithms. The procedure introduced identifies the positions where the indexes cannot generate local optima for the insert neighbourhood, and thus global optima solutions. This information is then used to propose a restricted insert neighbourhood that discards the insert operations which move indexes to positions where optimal solutions are not generated. In order to measure the efficiency of the proposed restricted insert neighbourhood system, two state-of-the-art algorithms for the LOP that include local search procedures have been modified. Conducted experiments confirm that the restricted versions of the algorithms outperform the classical designs systematically. The statistical test included in the experimentation reports significant differences in all the cases, which validates the efficiency of our proposal.

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[EN]The Mallows and Generalized Mallows models are compact yet powerful and natural ways of representing a probability distribution over the space of permutations. In this paper we deal with the problems of sampling and learning (estimating) such distributions when the metric on permutations is the Cayley distance. We propose new methods for both operations, whose performance is shown through several experiments. We also introduce novel procedures to count and randomly generate permutations at a given Cayley distance both with and without certain structural restrictions. An application in the field of biology is given to motivate the interest of this model.

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[EN]In this paper we deal with distributions over permutation spaces. The Mallows model is the mode l in use. The associated distance for permutations is the Hamming distance.