CCD测量液体折射率时边缘检测算法的改进

采用CCD作为光电探测器改进传统阿贝折射仪,进行液体折射率的自动测量,其关键是对CCD采集到的图像信号进行边缘检测,提出应用Canny算子对数字化图像进行处理,以获得亚像素分辨率边缘位置数据的数值算法。该算法能较好地抑制噪声干扰并有较高的边缘定位精度。     

建造合同中的企业所得税处理

建造合同准则和税法对收入的确认有时间和标准上的差异,给税前会计利润与所得税的应纳税所得额带来差异,这样给建造合同的所得税会计处理产生一定影响。     

The effects of a time-limited welfare program on children: the moderating role of parents' risk of welfare dependency

This study examined the effect of a time-limited welfare program on school-age children using data on almost 3,000 children (ages 5-17 at the four year follow up-point) from the random assignment evaluation of Florida's Family Transition Program (FTP). FTP was one of the first welfare reform initiatives to impose a time limit on the receipt of cash assistance, and it combined the time limit with a rich array of mandatory services. The effects of FTP on children were moderated by families' risk of long-term welfare dependency. Contrary to predictions laid out at the outset, there were few effects of FTP on middle childhood and adolescent children for children of parents most likely to be long-term welfare dependent (those most likely to hit the time limit). However, consistent negative effects on this same age group of children were found for children of parents least likely to be long-term welfare dependent--parents who had the largest employment gains--and effects of FTP were most strongly negative for the oldest adolescent children. The findings suggest a different theoretical model for movements into employment than the one suggested in the previous literature for job loss. The findings are discussed in terms of their contribution to research and policy.     

The empirical derivation of equations for predicting subjective textual information

Parameters pertaining to information processing by human beings have, in the past, been determined by learning and memory experiments with nonsense syllables, number sequences, etc. However, in the real world we are concerned with the processing of meaningful information, not senselles texts. Therefore, the determination of subjective information directly from meaningful material becomes extremely important in the instruction-learning process.This study derives an equation for predicting the subjective textual information contained in a text of material written in the English language. Specifically, this investigation describes, by a mathematical equation, the relationship between the subjective information content of written textual material and the relative number of errors committed by a learner when asked to predict, letter by letter, the content of given textual material. This relationship shows that the subjective information of a given text for a specific learner is directly proportional to the number of wrongly guessed signs made by that learner. This is expressed mathematically by% MathType!MTEF!2!1!+- % feaafeart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamysaiabg2 % da9iaaiodacaGGUaGaaGymaiaabccacaWGfbaaaa!3B57! \[ I = 3.1{\rm{ }}E \] 0935 0212 VWhere: I = Information in bits E = Number of wrongly guessed signsThe application of Shannon's guessing procedure (1951) in this study permits the measurement of the subjective information of a given text for a specific learner. Unlike senseless texts, the subjective information of a meaningful text varies from learner to learner. Therefore, the derived equation permits the measurement of information in terms of a value that is dependent not only upon the inherent qualities of the subject matter, but also upon the internal state of the learner.The derived equation for the English language is then compared to an equation derived by Weltner (1967) for the German language and found to be remarkably similar.This work was, in part, supported by United States Air Force Contract F41609-71-C-0027 entitled Flying Training Research on Airborne and Ground Training Systems, and a research grant from Arizona State University.     

一节数学课这样上好不好

在学校组织的“一节好课”中，我和教研组的同事一道听了一位青年教师的课，课题是：用公式法解一元二次方程。课从一元二次方程的一般形式ax^2＋bx＋c=0（a≠0）入手．用配方法得到求根公式。教师讲解得很严谨，注意到了二次项系数不为零、判别式要大于或等于零。     

数据库加密技术研究

对当前数据保密迫切性,数据库加密方式进行了详细的介绍和分析,并在此基础上,对基于密文查询的几种方法进行了深入的探讨,比较了他们相对的优缺点,提出了未来数据库加密机制需要努力加以解决的问题。     

谢朝华于己披,启夕秀于未振

中国古代的文学艺术理论，历来反对因袭模仿，而崇尚新奇、独创之美。在我国古代的文学艺术创作和文学艺术欣赏中，也鲜明突出地体现了文贵新奇、独创这一审美崇尚。     

浅析教育公平与我国民办高校的发展

教育公平应从不同的视角来分析,具体体现在受教育者个人、教育消费者背景、教育执行者和教育执行机构等多个方面.民办高校的发展与以下不同层面的教育公平有着密切关系:历史角色的责任公平;政府政策与法规的公平;社会大众心理的认同公平;教育资源配置与服务的公平.政府和民办高校两方面都要解决好教育公平问题,才能促进民办高校的健康持续发展.     

提高远程高等教育有效性基本途径分析

为保证远程教育成本投入的效果,本文从发展的角度,对远程教育的有效性进行了分析。研究表明,教学过程和教学条件是我国远程高等教育尚待加强的两大着力点,通过优化远程教育的教学过程,改善远程教育的教学条件,可以达到提高远程教育有效性的目的;同时,对远程教学管理体制进行改革以促进远程教育机制的优化,将成为提高远程教育有效性的制度性保障。     

美学与物理

科学真理是对现象本质的揭示,真实普遍的反映,物理学研究的是自然现象的普遍规律,从古到今的许多物理学家,在揭示自然规律时大都遵循着对称、协调、和谐、自然的完美性美学原则。因此,美学思维渗透在物理学理论研究中。