影响雷达阵地选择的因素权系数研究

本文采用层次分析法对影响雷达阵地选择的地形、战术、生存等因素及其子因素进行了分析与研究,确定了在选择雷达阵地时对这些因素考虑的权系数。分析结果表明,采用层次分析法确定各类因素在阵地选择中的权重,比专家指定法和效用函数法更加客观、方便,能满足快速决策的要求。     

Interpretation of the 4f-5d Excitation Spectra of Eu^3＋ and Tb^3＋ Doped in Crystals

The structure of the low-temperature 4f^N→4f^N-15d excitation spectra of Eu^3＋ and Tb^3＋ doped in crystals LiYF4, YPO4 and CaF2 measured by van Pieterson et al. in 2002 was analyzed and assigned based on the simple model proposed by Duan and co-workers in the last few years. Some complemental discussion on effects of J-mixing on the f-d transition intensities for Eu^3＋ due to the f-electron crystal-field interaction Hcf（f）, which was ignored in the simple mod- el, was presented. Some previously unexplained peaks for Tb^3 ＋ were interpreted to be spin-forbidden transitions to higher 5d crystal-field levels, or assigned to be f→d excitations with the core 4f7 excited from ^8S to ^6P, ^6I and ^6D, respectively. It is shown that the main structure of 4f-Sd excitation spectra of Eu^3＋ and Tb^3＋ can be well interpreted with the simple model.     

上海电网高压配电网络电压等级技术经济比较

本文从电网实际运行的情况出发 ,根据上海现有电网的特点 ,结合地区电力负荷的发展 ,对上海市中心区地区高压配电网的电压等级选择进行技术经济分析 ,建议 110kV和 35kV电网共同发展 ,现阶段可首先释放 2 2 0kV变电站中 110kV降压容量 ,110kV高压配电网主要用在负荷密度较高的地区     

Associations and Predictors of Posttraumatic Stress Levels According to Person-Related, Disability-Related, and Trauma-Related Variables Among Individuals With Spinal Cord Injuries.

Objective: To examine the associations and predictors of posttraumatic stress among individuals with spinal cord injuries (SCI) in the framework of a Person x Disability x Traumatic Event model. Design: An exploratory study involving analyses of variance, correlations, and a hierarchical multiple regression of a cross-sectional sample. Participants: Three hundred twelve individuals with SCI using a veteran or a civilian SCI clinic. Main Outcome Measures: Purdue Posttraumatic Stress Disorder--Revised scale (PPTSD-R). Results: Four out of all the examined variables had significant regression coefficients: spiritual-religious coping, pain level, severity of SCI, and number of traumatic events. Severity of SCI was a significant predictor, but data suggested that severity of SCI had a curvilinear association with both total posttraumatic stress levels and hyperarousal scores. Conclusion: Treatment of an individual's pain may reduce posttraumatic stress symptoms. Clinicians also can evaluate for previous trauma unrelated to the onset of the SCI and can intervene with the goal of reducing the impact of previous trauma on the individual's present emotional state and reactions to SCI. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于FPGA的多功能图像目标发生器的设计与实现

本文介绍了一种基于FPGA的图像目标发生器的设计方法,介绍了它的设计原理、硬件电路结构、各功能的实现方法。该图像发生器能产生灰度阶图像、静态目标图像和运动目标图像,用来对图像采集系统进行评估。     

Layer‐by‐Layer Decoupling of Twisted Graphene Sheets Epitaxially Grown on a Metal Substrate

The electronic properties of graphene can be efficiently altered upon interaction with the underlying substrate resulting in a dramatic change of charge carrier behavior. Here, the evolution of the local electronic properties of epitaxial graphene on a metal upon the controlled formation of multilayers, which are produced by intercalation of atomic carbon in graphene/Ir(111), is investigated. Using scanning tunneling microscopy and Landau‐level spectroscopy, it is shown that for a monolayer and bilayers with small‐angle rotations, Landau levels are fully suppressed, indicating that the metal–graphene interaction is largely confined to the first graphene layer. Bilayers with large twist angles as well as twisted trilayers demonstrate a sequence of pronounced Landau levels characteristic for a free‐standing graphene monolayer pointing toward an effective decoupling of the top layer from the metal substrate. These findings give evidence for the controlled preparation of epitaxial graphene multilayers with a different degree of decoupling, which represent an ideal platform for future electronic and spintronic applications.     

Towards a multi-levelled social process perspective on firm innovation: integrating micro,meso and macro concepts of knowledge creation

Abstract

The aim of this paper is to suggest a framework for studying firm innovation processes in a social process perspective that integrates the micro, meso and macro levels of analysis, that is, the knowledge creation of individuals/communities, the knowledge coordination of organisations, and the spatial–institutional contextualisation of knowledge. For this purpose, we suggest using as a starting point the so-called Combinatorial Knowledge Bases approach, which allows merging concepts about micro practices and macro contexts in an effective way. The suggested framework pays attention to different phases in the entire innovation process, characterised by different (micro) learning modes, situated in varying (macro) contexts and delineated by organisational (meso-level) choices, therefore enabling an integrated approach to the studying of firm innovation. To illustrate the potentials of applying the framework we present a process-oriented in-depth empirical case study of an innovation, following it from idea generation to market introduction by means of an innovation biography method.     

三层次互动情感体验在叉车内饰设计中的研究

目的以叉车内饰设计为实例,探索情感化设计理论的三个层次的互动指导在工程机械产品设计中的应用。方法结合产品的市场定位,讨论三层次情感体验的设计实现及相互影响,论述互动的三层次情感化体验在叉车内饰产品的设计流程中,以实现美与功能的恰当融合。结论三层次互动情感体验的应用可以帮助工程机械产品在设计上有所突破,在外观及功能的设计中始终围绕统一的设计主旨,能够塑造内外一致的产品形象,以满足用户对产品日益精进的审美要求。     

远海船舶噪声分布初步研究

舰船数量、吨位以及航行距离的急剧上升导致了海洋环境噪声级大幅度升高,对海洋环境的影响也日趋加重。但是当前的海洋环境噪声研究所使用的历史航船数据库的信息却非常匮乏且无法及时更新,不能反映出船舶噪声真实的变化情况。此外,对于远离岸边的海域,岸基船舶自动识别系统(Automatic Identification System,AIS)与雷达无法监测到,卫星AIS技术的不成熟导致了船舶数据时效性和完整性的严重不足。因此,尚无可用的远海大范围的船舶数据。为了解决远海船舶数据缺乏的问题,提出了一种基于多源AIS数据的数据融合方法,根据某海域在某个时间段内收到的所有AIS信息,处理后进行融合,融合结果可以得到任一时刻该海域的船舶分布情况,进而可计算出该海域的区域船舶噪声级。     

Simultaneous Boost of Power Factor and Figure‐of‐Merit in In–Cu Codoped SnTe

Significantly enhanced thermoelectric performance is achieved for eco‐friendly SnTe by a coorperative effect between a dopant resonant energy level and interstitial defects. By manipulating the band structure through indium doping, the Seebeck coefficient is remarkably improved, leading to an enhanced power factor, with a high level of ≈29 µW cm^?1 K^?2 at 873 K. Lattice thermal conductivity is sharply reduced, approaching the amorphous limit, through the strong phonon scattering induced by multiple scales of Cu₂Te nanoprecipitates, as well as Cu interstitials, leading to a high ZT value of ≈1.55 at 873 K.