Demands on Attention and the Role of Response Priming in Visual Discrimination of Feature Conjunctions.

This study examined how response mapping of features within single- and multiple-feature targets affects decision-based processing and attentional capacity demands. Observers judged the presence or absence of 1 or 2 target features within an object either presented alone or with distractors. Judging the presence of 2 features relative to the less discriminable of these features alone was faster (conjunction benefits) when the task-relevant features differed in discriminability and were consistently mapped to responses. Conjunction benefits were attributed to asynchronous decision priming across attended, task-relevant dimensions. A failure to find conjunction benefits for disjunctive conjunctions was attributed to increased memory demands and variable feature-response mapping for 2- versus single-feature targets. Further, attentional demands were similar between single- and 2-feature targets when response mapping, memory demands, and discriminability of the task-relevant features were equated between targets. Implications of the findings for recent attention models are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The Influence of Rapid Annealing Cycles on the Recrystallisation Behaviour of Cold Rolled Ultra Low Carbon and Low Carbon Steel

For ultra low carbon (ULC) and low carbon steel (LC), the influence of heating rate, annealing temperature, and holding time on the recrystallisation behaviour and the resulting grain size was investigated. For ULC smallest grain sizes of about 9 μm were obtained at the lowest heating rate whereas for LC significant smaller grain sizes of about 5 μm were determined at the highest heating rate. Furthermore, the evolution of the grain size distribution with varying heating rate, annealing temperature, and holding time was studied in dependence of the rolling and normal direction. The state of the as‐hot rolled microstructure as well as the precipitation state exert a strong influence on the development of the recrystallised microstructure along the different directions for both steel grades. The inherent prolonged microstructure due to the cold rolling process is still obvious just after recrystallisation. With ongoing annealing and grain growth, the aspect ratio approaches the equiaxed state. This change proceeds faster for the ULC steel grade. With increasing annealing temperature, the bimodal character of the grain size distribution disappears and the distribution becomes more homogeneous.     

Evaluation of Desulphurization Flux in CaO‐Al2O3‐BaO‐CeO2‐MgO System

The flux of the CaO‐Al₂0₃‐BaO‐CeO₂‐MgO system as a desulphurization flux containing no fluorine for the secondary metallurgy process was evaluated in this study. The flux composition was designed using the eutectic compositions of the binary systems. The melting and desulphurization abilities of the fluxes were evaluated by measuring their liquidus temperatures and the distribution ratios of sulphur between the fluxes and the carbon‐saturated iron or stainless steel. The lowest liquidus temperature of 1325°C was obtained by adding 5.7 mass% MgO to the 80mass%A‐20mass%B flux. (A: 12CaO‐7Al₂O₃, B: BaCeO₃+12mass%Al₂O₃). The distribution ratios of sulphur and sulphide capacities of the fluxes in this study were higher than those of the commercial product of calcium aluminate flux. This means that the CaO‐Al₂O₃‐BaO‐CeO₂‐MgO fluxes developed in this study have higher desulphurization and melting abilities compared with the commercial product of calcium aluminate flux.     

Physical and Electrochemical Properties of Doped LiFePO4 as Cathode Material for Lithium-Ion Batteries

LiFePO4 cathode material was synthesized by a solid-state reaction using doping several elements (Nb5 ,Zr4 ). The starting materials were mixed with a high-efficient sander and treated thermally under flowing N2. The samples were characterized by X-ray diffraction (XRD), field-emission gun electron microscopy (FEG), and their electrochemical performance was investigated in the term of cycling behavior. Room temperature discharge capacity about 140.6 mA·h·g-1 was obtained at C/5 rate.     

蓝牙网络的带宽容量分析

目前,无线个人域网(WPAN)的发展已经吸引了人们的特别关注,其中的蓝牙技术就是一种新兴的WPAN技术。蓝牙是一种短距离的无线通信技术,它的带宽资源非常有限,因此合理利用蓝牙网络的带宽以及有效地分配带宽资源就成为了目前蓝牙网络发展的一个重要方面。该文在介绍蓝牙网络、比较蓝牙网络与IEEE802.11无线局域网(WLAN)的基础上,对蓝牙网络的容量进行了定量分析,并分析了其网络模型,给出了链路的容量条件。此外,还分析了无线网络在资源分配时所使用的流量模型。这两个模型的相同之处就在于都可以通过凸形优化问题来解决容量的分配。     

嵌入式设备中一种大容量存储系统的软件设计

该文结合工程实践,提出了一个采用NORFlash和NANDFlash混合设计的大容量、低成本存储系统的解决方案,并结合具体的开发环境,描述了该存储系统支撑软件的体系结构,最后给出了驱动软件的详细设计与实现方法。     

内蒙古东部区主要作物降水利用率与生产潜力研究

2000～2002年在内蒙古东部区四盟市开展了主要作物降水利用率与生产潜力的研究。经过3年的调查研究,建立了大豆、玉米等六大主栽作物的降水生产潜力模型,分析讨论了各地区不同作物降水资源的利用现状。     

间隙对磁流体密封水介质的影响规律

为提供磁流体密封水的应用技术支持,研制了磁流体密封的试验装置,提出了新的试验方法来验证和解释理论分析和推导的正确性。试验中采用不同的密封间隙,以确定磁流体密封能力与密封间隙之间的关系。试验结果表明,磁流体的密封能力随密封级数的增加而提高;在一定范围内随密封间隙的增大而减小;密封间隙在0.05-0.20 mm时,效果较好,同时密封级数有一个最佳值;但是在特别小的时候,与所有文献报道不同的是密封能力不是提高而是在减小。     

我国交通运输设备制造业科技投入竞争力研究 --以大中型工业企业为案例的分析

交通运输设备制造业的竞争力,在很大程度上代表了一个国家或一个地区制造业的水平。其中科技投入是重要决定因素。本文以大中型工业企业为案例,实证研究了我国交通运输设备制造业科技投入竞争力建设的行业特征、地区特征和存在问题,为我国机电产业科技竞争力提升提供决策依据。     

基于惯量支撑和一次调频需求的VSG储能单元配置方法

分布式电源大量接入电网会引发电网惯量、阻尼缺失和系统稳定性下降问题,虚拟同步发电机(VSG)在分布式电源友好接入和提高电力系统稳定性等方面极具应用前景。作为虚拟惯量的物理基础,储能单元的配置直接影响着VSG的性能和成本。文中基于VSG的惯量支撑、一次调频两大基本功能,建立了响应电网频率波动的储能单元出力模型,提出了一种以元件参数和控制参数为基础的储能单元配置方法。然后,计及下垂系数、阻尼系数和惯性常数,研究了储能单元出力的暂态特性及其调节机制,并分析了储能单元功率、容量需求受控制参数影响的机理,明确了影响程度最大的控制参数。最后,借助仿真和实验证明了所提方法的正确性。