低损耗TiO2/Ormosil平面波导的制备及表征

TiO2/ ormosil planar waveguide was prepared by sol-gel method at low thermal treatment temperature （ 〈 200 ℃）. Scanning electron microscope, FT-IR spectrometer, spectrophotometer, atomic force microscopy, thermal analyzer, and dark m-line spectroscopy were used with the method of scattering-detection to investigate optical and structural properties. High optical quality waveguide film was obtained. The propagation loss of film was 0.569 dB/cm at a wavelength of 632.8 nm.     

简化的Smale马蹄模型

定义了符号空间上的拟移位映射,并用该类映射描述了平面Cantor集上的混沌映射,给出此映射的一些性质和Smale马蹄模型的简化形式.     

BBM方程孤立波和周期波解的分支

用平面动力系统的方法研究了BBM方程，光滑的孤立波和周期波解的存在性被证明了。在参数平面的不同区域，给出了足够的条件来保证上述解的存在性。在一些条件下，列出了解析的精确孤立波解和周期波解。     

mBBM方程的钟状代数孤立波解

本文以连结尖点的同宿轨对应的钟状代数孤波解为研究对象,以修正的Benjamin-Bona-Mahoney（简称mBBM）方程为例,利用平面动力系统知识,分析了其代数孤波解出现的条件,提出了求解的新方法,称之为代数孤波解解法,获得了方程的代数孤波解.以往对这种解的关注很少,因而对这种解及其解法的研究具有一定的创新性。     

具有平面超薄膜结构的二维材料太阳能吸收器

单原子层二维材料是有潜力的太阳能光伏电池材料。研究基于二维材料的具有简单平面结构的太阳能吸收器的吸收率能否达到100%。提出二维材料/透明材料/金属基底结构,引入透明材料厚度和入射角度2个可调参数,因而能满足增强平面薄膜结构吸收率的2个维度的相位匹配条件。以MoS₂和石墨烯为例,研究表明一定存在一对透明材料厚度值和入射角度值,使结构吸收率达到100%。平面结构加工简单,利于推广二维材料在光伏转换中的应用。     

Flexible Calibration Method for 3D Laser Scanner System简

In this paper, a flexible high-precision calibration method suitable for industrial field was proposed. The complexity of the coordinate transformation was simplified by choosing the camera coordinate system as the unified reference coordinate system. A flexible planar calibration pattern was introduced to the calibration process, which can be arbitrarily placed and from which the known feature points can be extracted to construct other unknown feature points. With the known intrinsic parameters, the laser projector plane equation was fitted by the multi-noncollinear points, which were acquired through the principle of triangulation and the projective invariance of cross ratio. With this method, the strict alignment and multiple times of coordinate transformation can be avoided. Experimental results showed that the arithmetic mean of the root mean square （RMS） error of distance was 0.000 7 mm.     

低损耗TiO_2/Ormosil平面波导的制备及表征(英文)

1IntroductionPlanar waveguides have recently received much at-tention dueto their promising applications inintegratedoptics[1-5].Formation of a waveguide requires a guid-inglayer with the refractive index higher than that ofthe substrate and cladding. The number of guidingmodes depends on thickness and refractive index ofthe guiding layer . Low optical loss is an i mportantproperty of waveguide . Although pure inorganic fil msusing the sol-gel technique have both good mechanicaland thermal st…     

广告专业平面构成课程教学改革的思考

分析广告专业平面构成课程教学中“教”与“学”两方面的问题,提出合理安排“平面构成”的教学内容、引导思维从具象到抽象的转换、加强创造思维的训练、创建有效的评价机制等具体措施,力求在教学内容、方法、及成绩测评等几方面进行改革,以实现教学的“科学性”和“合目的性”,使平面构成课程能坚持以创意为核心、以形象为依托、以法则为规矩的造型训练,为学生今后的广告设计打下坚实牢固的基础。     

可实现(γmin推)max、[γ]的双曲柄机构设计

将运动倒置原理与"辅助角方法"巧妙、有机地结合起来,并引入虚拟的曲柄摇杆机构为桥梁,成功地得到了按行程速比系数K兼按最佳传动角(γmin推)max或许用传动角[γ]设计Ⅰ型、Ⅱ型平面双曲柄机构的解析方法.     

多沟道平板波导的TM模色散方程的确定

采用分析转移矩阵方法(ATMM)研究了多沟道平板光波导的模式特性,导出了任意多层平板波导和多沟道波导的TM模的色散方程.