Special issue on wireless sensor networks: from theory to practice

Wireless sensor network(WSN)is characterized by the dense deployment of sensor nodes that continuously observe physical phenomenon.The main advantages of WSN include its low cost,rapid deployment,self-organization,and fault tolerance.WSN has received tremendous interests of various research communities,and significant progresses have been made in various aspects including sensor platform development,wireless communication and networking,signal and information processing,as well as network performance evaluation and design.Such work has established good foundation     

FLOCCULATION/COAGULATION OF NATURAL ORGANIC MATTER FOR PRETREATMENT OF WATER ANDWASTE WATER

Characterization of water, waste water and natural organic matter are involved in this paper, and as well as the features of flocculation and coagulation for removing natural organic matter from water and waste water Novel flocculant and coagualant is strongly asked for improving removal efficiency and environment friendly. Enhanced coagulation is introduced to meet the experimental and practical requirement.     

Optical and Structural Properties of In_(0.52)Al_(0.48)As/InP Structures Grown at Very High Arsenic Overpressures by Molecular Beam Epitaxy

Growth of ln0.52Al0.48As epitaxial layers on lnP(100) substrates by molecular beam epitaxy at a wide range of arsenic overpressures (V/III flux ratios from 30 to 300) has been carried out. Analysis performed using low-temperature photoluminescence (PL) and double-axis X-ray diffraction (XRD) shows a strong and prominent dependence of the PL and XRD linewidths on the V/III flux ratio. Under our growth conditions, both the PL and XRD linewidths exhibit a minimum point at a V/III flux ratio of 150 which corresponds to a maximum in the PL intensity and XRD intensity ratio. Flux ratios exceeding 150 result in an increase in both the PL and XRD linewidths corresponding to a reduction in their associated intensities. Room temperature Raman scattering measurements show a narrowing in the lnAs-like and AlAs-like longitudinal-optic (LO)phonon linewidths which broaden at high flux ratios, while the LO phonon frequencies exhibit a gradual reduction as the flux ratio is increased. PL spectra taken at increasing temperatures show a quenching of the main emission peak followed by the evolution of a broad lower energy emission which is possibly associated with deep lying centres. This effect is more prominent in samples grown at lower V/III flux ratios. Hall effect measurements show a gradual reduction in the mobility in correspondence to an increase in the electron concentration as the flux ratio is increased.     

DIRECT RESONANCE OF TURBULENT BOUNDARY LAVER OVER COMPLIANT WALLS

１．　ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｍａｉｎｇｏａｌｏｆｔｈｉｓｐａｐｅｒｉｓｔｏｅｘｐｌｏｒｅｔｈｅｐｏｓｓｉｂｉｌｉｔｙｔｏｌｅａｒｎｍｏｒｅａｂｏｕｔｔｈｅｍｅｃｈａｎｉｓｍｏｆｔｕｒｂｕｌｅｎｔｂｏｕｎｄａｒｙｌａｙｅｒｆｌｏｗｉｎｔｅｒａｃｔｉｏｎｓａｎｄｉｔｓｅｆｆｅｃｔｓｏｎｃｏｍｐｌｉａｎｔｗａｌｌｐｅｒｆｏｒｍａｎｃｅ．Ｔｈｅｒｅａｒｅｃｅｒｔａｉｎｐｒｅｒｅｑｕｉｓｉｔｅｃｏｎｄｉｔｉｏｎｓｔｏｆｕｒｔｈｅｒｔｈｅｓｔｕｄｙｏｎｔｈｅｍｅｃｈａｎｉｓｍ，ｉ．ｅ．ｔｈｅｃｏ…     

新加坡电影业和数字影院技术的发展概况

近年来，在新加坡政府的支持及各项政策的推动下，新加坡数字技术应用和网络资讯科技的发展位于世界领先地位，特别是电影放映业取得较大发展，票房收入不断提高。为了解新加坡数字电影放映技术的最新发展情况及其市场运作模式，3月27日至4月1日，中国电影科研所电影技术考察组在新加坡进行了为期4天的专访和考察。考察期间我们与新加坡有关政府部门的代表、相关公司的主要负责人和技术专家进行了交流和座谈，现将考察情况综述如下。     

高温热管在硫酸工业余热回收中的应用

将高温热管蒸汽发生器应用于硫酸生产工艺,回收了大量的ＳＯ２炉气高温余热,解决了硫酸生产工艺炉气降温的难题,取得了很好的经济效益和社会效益。     

陕西省信息大厦超高层结构设计和安全性分析

陕西省信息大厦结构设计有以下特点:(1)是目前国内8度抗震设防地区最高的超限高层钢筋混凝土组合简体结构,主楼高189.4m;(2)国内首次在黄土地区采用68m长的超长钻孔灌注桩;(3)为减少建筑物高度,7～48层采用部分无粘结预应力混凝土板结构;(4)进行了结构弹塑性分析,包括静力推覆(Pushover)分析和动力反应时程分析。     

基于广义装配原理的产品生长型设计

通过研究生物生长与产品设计之间的相似性,提出了基于广义装配原理的生长型设计过程,研究了广义装配原理的三个理论构成。首先,在产品生长阶段,为实现生长过程中的自然选择,提出了以复杂度理论为控制因素的设计推理策略;其次,提出了功能公差设计理论,通过加工成本以及基于多因素的模糊质量损失成本体现广义装配成本,在确保产品功能的同时,以较低的装配与制造成本为公差的分配策略;在产品进化阶段,为保证产品良好的装配性能,采用了虚实结合设计技术。将以装配质量因素为核心的产品复杂度、精度以及制造、装配成本等众多设计因素并行集成于生长型设计过程中,实现了以全生命周期装配质量保障为核心的产品生长型设计。     

THR EFFECT OF OXIDE LAYER FORMATION ON THE ADHESION OF CONDUCTIVE POLYMER COATING TO A MILDSTEEL

１．ＩｎｔｒｏｄｕｃｔｉｏｎＲｅｃｅｎｔｌｙ,ｔｈｅｒｅｈａｓｂｅｅｎａｎｕｐｓｕｒｇｅｏｆｉｎｔｅｒｅｓｔｉｎｔｈｅｐｒｅｖｅｎｔｉｏｎｏｆｃｏｒｒｏｓｉｏｎｏｆｓｔｅｅｌｔｈｒｏｕｇｈｔｈｅｕｓｅｏｆｃｏｎｄｕｃｔｉｖｅｐｏｌｙｍｅｒｃｏａｔｉｎｇｓ〔１〕．Ｕｎｆｏｒｔｕｎａｔｅｌｙ,ｐｏｏｒｃｏａｔｉｎｇａｄｈｅｓｉｖｅｄｕｒａｂｉｌｉｔｙ,ｗｈｉｃｈｈａｄｏｆｔｅｎｂｅｅｎｅｎｃｏｕｎｔｅｒｅｄｄｕｒｉｎｇｃｏａｔｉｎｇｅｍｐｌｏｉｅｄ,ｌｉｍｉｔｅｄｔｈｅａｐｐｌｉｃａｔｉｏｎｏｆｃｏ…