现代数字物理教学连载①——现代数字物理教学的主要特色

介绍了现代数字物理教学的主要研究成果,分析了现代数字教学的主要特色．     

红外焦平面信号读出及处理技术

读出电路是红外探测器组件的重要组成部分,其性能对组件乃至整个成像系统的性能影响重大。本文旨在说明根据不同类型的红外探测器及应用需求特点,读出电路应采取相应的信号读出处理技术,以提高组件性能。文章介绍了适用于不同探测器及应用需求的源随输入级、直接注入输入级、容性反馈放大器输入级信号读出技术,相关双采样低噪声处理技术以及像素级数字化技术。     

雷达中频信号数字化研究及实现

文中结合雷达中频信号数字化课题的具体要求,在讨论数字中频的理论算法和工程实现方案的基础上,设计了基于软件无线电思想的雷达中频数字化硬件平台。针对软件无线电的中频数字化技术进行探讨,深入研究了有关信号采样和数字正交的理论,探讨了实现数字正交采样相干检波的高精度算法,设计了基于软件无线电思想的中频数字化硬件系统,主要包括信号采集电路设计、中频数字化电路设计、逻辑控制电路设计和系统自检电路设计四个部分。此外,本方案还可在无雷达回波数据的情况下进行系统自检,大大提高了系统的可调试性和可靠性。     

满映射Logistic数字混沌序列的产生及性能分析

Logistic映射形式简单,但表现出了复杂的动态性能。以满映射Logistic混沌序列为对象,讨论了混沌序列数字化的两种方法,推导了数字混沌序列比特位分布概率,计算了截短数字混沌序列的相关性能。结果表明,在不变分布偶对称的情况下,两种方法得到的数字化混沌序列都是"0""1"等概率的,截短序列的自相关函数旁瓣方差和互相关方差均等于序列长度N的倒数。对数字化Lo gistic混沌序列进行了数值仿真,所得结果与结论相吻合;仿真结果还显示,自相关旁瓣和互相关均服从高斯分布。研究结果使得能够从理论上对一类数字混沌序列的特性进行整体把握,超越了经验性的结论,便于在有关系统中进行应用分析。     

战场数字化基础设施建设探析

借鉴发达国家军队战场数字化基础设施建设的有关情况,探析了战场数字化基础设施及其支撑能力、战场数字化基础设施建设的内容和措施等问题。     

THREE DIMENSIONAL DIGITIZATION OF HUMAN HEAD BY FUSING STRUCTURED LIGHT AND CONTOURS

Three dimensional digitization of human head is desired in many applications.In this paper, an information fusion based scheme is presented to obtain 3-D information of human head, Structured light technology is employed to measure depth.For the special reflection areas, in which the structured light stripe can not be detected directly, the shape of the structured light stripe can be calculated from the corresponding contour.By fusing the information of structured light and the contours, the problem of reflectance influence is solved, and the whole shape of head ,including hair area, can be obtained.Some good results are obtained.     

解构面向B端客户的营销数字化与数字化营销

结合面向B端客户的营销特点,对营销数字化与数字化营销的关系进行了阐述,尝试解构2B营销数字化与数字化营销的具体内涵与实施方式,总结出2B营销数字化的四条可行路径与数字化营销实施的四个层级,结合工作实践给出了具体方法建议。     

语言类录音教材产品编辑加工中的音色处理

通过对语音信号频谱特点和听感特征的分析,探讨了语言类录音教材产品后期制作中语音音色处理的基本要求和主要方法,为高质量语言录音教材的产品加工提供了相应的技术指导。     

工业互联网推动区域产业创新

随着新一轮科技革命和产业变革的蓬勃兴起,工业互联网为实体经济各领域的数字化、网络化、智能化转型提供了具体的实现方式和可行的实施路径。从工业互联网带动区域产业转型升级的角度,结合深圳宝安区区域产业基础特点、转型升级的现实需求和挑战,探讨了工业互联网区域发展的路径和举措。     

Studies of the wetting kinetics of liquid drops on solid surfaces

The viscosity _L and the surface tension _L of the liquid as well as the equilibrium contact angle _e are essential parameters governing the wetting kinetics of liquids on solids. By means of a contact angle apparatus with video image digitization, the dynamic contact angle and the radiusr of the contact area of sessile drops on solid surfaces have simultaneously been determined in dependence on time after drop application between about 3·10^–2 s and long times.The measurements were performed with series of liquids: polydimethylsiloxanes with different molecular masses and solutions of polyisobutylene in decalin and polyacrylic acid in water, covering a wide range of concentrations. The liquids in each series have a constant surface tension, but viscosities ranging over about four orders of magnitude, allowing the influence of _L and _L to be studied independently. Solids such as glass, polyethylene and polytetrafluoroethylene were chosen so that the cases of complete wetting (spreading) and partial wetting ( _e) could be studied.The curves of cos andr/R ₀ vs. time for the different liquids of a series can be superimposed to a master curve by plotting them against _L·t _L·R ₀, whereR ₀ is the radius of the original drop. All these master curves coincide at small wetting times, with exception of the data for the polysiloxanes. That means that the early stage of the wetting process is determined only by the properties of the wetting liquid. The influence of the solid surface, characterized by the equilibrium contact angle _e becomes significant only at the end of the wetting process.Dedicated to Professor Dr. H. Willersinn on the occasion of his 65^th birthday