用变焦镜头摄影的焦距实时检测方案

在摄影测量中，用变焦距镜头摄取图像时，需对变焦的全过程做实时的检测。这一焦距检测的过程是通过对镜头各镜组间距的检测完成的，并采用实验的方法，通过布设控制点，首先在变焦镜头使用之前对变焦起始位置的镜头焦距进行检测。论述了变焦镜头焦距实时检测的基本原理、精度分析及具体实施方案。     

基于面阵CCD测量镜头焦距的一种方法

提出一种实时测量镜头焦距的方法,用彩色面阵CCD实时采集光谱图像,然后利用MATLAB软件环境计算出镜头焦距值,并对结果进行误差分析.     

高速电视测量仪中精密变焦系统控制方法的研究

介绍了高速电视测量仪中用于精密交焦系统在测量中的控制方法。系统主要采用PC104系统核心模块、运动控制卡,以及步进电机来实现对变焦系统的精确控制,再加上对镜头的精确标焦,修正镜头自身的系统误差,从而使得基于交焦距镜头的高速电视在用于弹道测量中成为可能,大大提高了靶场测量精度。     

变焦距镜头电子变焦模式

提出一种全新的高斯光学算法，对电子变焦模式的变焦距系统高斯光学参数的计算方法进行研究．通过求解超越方程(组)及三次样条函数插值法计算凸轮曲线，处理了与自动调整物距(调焦)相关联的连续变焦模式以及与其无关的独立变焦模式，实现了任一变焦方式的高斯光学参数的计算．该算法基于高斯光学乘加递推算法，采用多项式，避免了有理函数的运算，比高斯括号法简明方便，有利于简化电子变焦模式变焦系统镜头参数的计算．     

沉筒式数码相机变焦镜头结构仿真分析

为了减小沉筒凸轮回转中的阻力，避免自锁，必须限制凸轮变焦曲线压力角的极限值；针对常用沉筒式数码相机变焦镜头结构进行了分析，仿真了具有3倍光学变焦的沉筒式变焦镜头光学设计和装配结构设计，建立了筒型凸轮的压力角公式，并对光学设计、结构设计、变焦过程以及零件的工艺要求进行了分析探讨．     

高倍变焦的小相机

10倍变焦的卡片数码相机已经不足为奇。但是,要把10倍变焦能力和轻薄小巧的机身定义在一起,却是一道难以破解的命题。而奥林巴斯Ix9000恰恰针对这道难题给出了完美的答案,为μ9000装配了10倍光学变焦镜头（焦距折合35毫米相机为28～280毫米）,同时又将机身厚度控制在最薄处约24．8毫米的程度。而高感光度、双重防抖功能,可以全面提升相机的防抖效果,保证清晰锐利的成像效果。另外,美颜模式等众多特色功能,还能让用户在体验方便携带之余,轻松享受到精彩影像的无穷魅力。     

工业摄像机自动聚焦系统设计

在工业射线实时成像检测系统中,常常通过调节成像系统的光圈和焦距对被检测构件的局部位置进行放大,以达到最佳的检测灵敏度。因此光学系统焦距、光圈的调节直接影响系统的成像质量。针对这一背景,研究了自动聚焦系统的设计与实现方法。     

时尚新品

望远相机产品名:Lumix DMC-FZ70标签:60倍光学变焦、松下①亮点:Lumix DMC-FZ70拥有1610万像素的感光元件,60倍的变焦镜头可达到等效1200mm望远焦段,并提供PowerO.I.S防抖系统。这颗镜头的最大光圈为f/2.8-5.9,还可以带来20mm的超广角表现。FZ70的高清录像能力,最高可提供20Mbps的1080p/30fps录像规格。     

基于电润湿效应的液体透镜焦距随电压变化的响应时间的测量法

运用高斯光束传输理论,提出了运用高斯光束经焦距变化的变焦液体透镜时光束光通量的变化来测量变焦液体透镜的焦距变化随电压变化的响应时间的观点。运用光电探测器测量光束光通量的变化,来反映液体透镜焦距的变化。并讨论了光通量变化时光电探测器放置的最佳位置和小孔半径的最佳大小。     

中等视场大相对孔径水下两档变焦光学系统

研究了水下两档变焦光学系统的设计方法并给出了具体设计实例。采用轴向移动变焦方式,变焦过程中相对孔径保持不变,相对孔径为1/1.4,系统变焦比为2,在水下的宽视场角为60,°有效焦距3.6 mm,用于大范围内搜索目标;窄视场角为20°,有效焦距7.2 mm,用于对目标进行具体分析。在空间42 lp/mm处的宽视场和窄视场的光学传递函数值均大于0.4,成像质量较好。既满足了水下成像对大相对孔径和较大视场的要求,又能够在大范围内搜索目标,小范围内对具体目标进行分析,满足实际应用的需要。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with