基于CCD的智能车导航系统研究

目前智能车导航大多采用摄像机来获取路面信息,针对这一特点研究开发了基于CCD的导航模块.详细介绍了CCD视频信号的采集及处理方法.考虑到环境光线的变化会影响导航效果,提出了一种自适应动态阈值图像处理算法;该算法运算量小,能跟踪环境光线的变化.同时给出了系统抗干扰的处理方法,从而有效解决了因外界光线和赛道变化引起的智能车跑偏问题.通过系统实验和竞赛,证明了该导航系统具有良好的智能性和抗干扰能力,即此方案是有效的.     

修辞的分类及其在各种语境中的侧重应用

修辞的应用在很大程度上可使语言显得更优雅、更形象、更富于表达力。文章主要探讨了广泛意义上修辞的分类及修辞格在不同语境中的侧重应用,并针对一些常见的语境给出了具体的例句分析。目的是切合语境选择恰当的修辞,从而提高我们的语言表达能力。     

手持设备上基于隐式反馈的网页兴趣块提取

为使用户在手持设备上提取用户兴趣是重要基础,提出一种基于用户隐式反馈的方法。该方法从网页中提取兴趣块(用户感兴趣的网页内容),假设用户的浏览行为如在块上的停留时间、滚动次数、滚动速度、进入链接的次数等与用户是否对块感兴趣相关。从手持设备上的浏览行为中提取了34种隐式反馈特征,通过分析18个用户在608个网页的9474个块上的浏览行为,验证了其中29种特征与兴趣块的相关性,并且这种相关性能用于跨用户、跨网站的兴趣块提取。该文的研究成果可用于建立个性化的用户偏好模型,应用在手持设备上的自适应网页浏览中。     

Functionally Gradient Material Laser Rapid Prototyping Technique

The functionally gradient material laser rapid prototyping system is developed based on the increasing material manufacture idea of the rapid prototyping. The system hardware is composed of a 5 kW CO2 laser, a three-dimensional numeric control table, a three-stock-bin coaxial powder delivery device, and an integration operation control desk. The system software is composed of the CAD slicing and scan filling module, materials component distributing design module, and hardware equipment integration drive module. The real time change proportion allocation technique of three metal powders, powder uniform mixing technique, and coaxial powder delivery technique are studied. According to the principle of the output powder cumulative volume invariable in unit time, the real time powder allocation formulae are deduced. The design method of the materials component distributing regularity in the part entity is studied. The gradient change regularity of the face gradient, line gradient, and point gradient is studied. A sort of the file layout of integrating material information and geometry information is brought forward.     

蛇足石杉外植体表面消毒及内生菌消除方法

为了获得蛇足石杉的无菌材料,使用双氧水、酒精、升汞等消毒剂对外植体进行表面消毒,使用混合抗菌溶液及不同温度的热水浴处理外植体以消除内生菌.结果表明:茎段经预处理后,用47 ℃热水浴处理1 h,再经70 %酒精处理30 s, 0.1 %升汞处理7 min后,能达到较好的表面消毒及内生菌消除的效果;孢子囊和茎尖经预处理后,再经过70%酒精处理30 s,0.1 %升汞处理4 min即可达到较好的表面消毒效果;消毒剂结合温度处理能降低内生菌的污染率;孢子囊和茎尖几乎不含内生菌,是可用于组织培养的较好的外植体.     

微机综合保护装置零值显示处理的方法

运行实践显示,微机综合保护装置在使用过程中,当目标对象数值为0时,存在着微小数据显示的问题。分析了数据产生的原因,并就此提出了一种简易的解决方法,经改进后实际运行检验表明效果良好。     

Theoretical analysis and simulation of InP-based uni-traveling-carrier photodetector

In this paper the photocurrent response of InP-based uniotraveling-carrier photodetectors （UTC-PDs） is analyzed using the drift-diffusion approach. Based on the theoretical analysis, an InP/InGaAs UTC-PD is modeled utilizing a numerical device simulator （ATLAS）, and the physics of the device＇s operation and its performance as a function of biasing and power level are simulated. The simulation results indicate that the linear dynamic range is up to 60 mW, the f-3 dB is about 40 GHz and the full-width at half-maximum （FWHM） of the current pulse is 28 ps with 10 mW optical power injection for an optimized structure UTC-PD.     

Regeneration and identification of interspecific asymmetric somatic hybrids obtained by donor-recipient fusion in cotton

Asymmetric hybrids between Gossypium hirsutum （YZ-1） and G. davidsonii were obtained by donor-recipient fusion. YZ-1 was considered the recipient and was pretreated with iodoacetamide （IOA）, while G. davidsonii was considered the donor and was irradiated with ultraviolet （UV） before fusion. YZ-1 protoplasts stopped growth when treated with 0.5 mmol/L IOA for 20 min, and G. davidsonii protoplasts stopped growth when irradiated with 38.7 J/cm2 UV for 30 s. Asymmetric somatic hybrids were obtained by electrofusion between the separately treated protoplasts of the 2 species. The regenerated plants were identified by morphological, cytological, and molecular analysis. Most regenerated plants derived from fused protoplasts displayed new morphology; some were intermediate between the two parents and a few displayed recipient-like morphology. Chromosome numbers in these somatic hybrids mostly ranged from 40 to 73. The hybridity was confirmed by random amplified polymorphic DNA and simple sequence repeat analysis. Organelle DNA inheritance of the YZ-1 and G. davidsonii somatic hybrid was investigated by cleaved amplified polymorphism sequence and chloroplast simple sequence repeat analysis, which indicated that recombination and rearrangements might have occurred in some regions of mitochondrial and chloroplastic DNA. This is the first report of completely asymmetric hybrid production via donor–recipient fusion between G. hirsutum and G. davidsonii, which is a novel case in hybrid production following the symmetric fusion and asymmetric fusion based on UV irradiation in cotton.     

聚合物乳液在线调驱技术的研究

针对复杂断块油藏高含水期地层非均质性严重、剩余油分布零散、近井调剖效果差的问题,开展了聚合物乳液在线调驱技术研究。研制了以聚合物乳液和交联剂XL—2为组成的聚合物乳液在线调驱体系,并对调驱体系进行了性能评价,设计了在线注入装置。结果表明:聚合物乳液稳定时间大于6个月,溶解时间小于15 min,调驱体系交联黏度大于150 mPa·s,交联时间在1~15 d可控,物模试验提高采收率大于15%,在线注入装置能够实现聚合物乳液的在线溶解。     

智能变色窗的研究现状与发展趋势

概述了一种成功研制的基于蓝色导电高分子材料聚噻吩及其衍生物的智能变色窗.开发出红色和绿色分子单体及相关器件,设计出基于有机高分子工作电极和无机碳、金属或金属氧化物对电极的器件结构,以及半固体,固体电解质.所开发出的智能变色窗、智能变色眼镜等器件样品涉及民用、工业及军事等多个领域.电致变色窗的当前及未来发展包括大尺寸建筑和汽车用玻璃窗、显示器、变色织物,装饰品及护眼等装置.