过程控制测量信号数字滤波方法优化

在对过程控制实验装置上某一液位测量信号分析的基础上,提出了兼顾平滑性和准确性的滤波性能指标。应用该指标分别编写了查询一阶惯性滤波法、中位值滤波法和平均值滤波法的最佳滤波参数程序。通过对3种方法最佳滤波参数的分析,确定了一阶惯性滤波法更适合过程控制实验装置的这一液位信号,该方法的实验室装置应用效果也证明了其有效性。     

一种改进的加权滤波去噪算法

噪声图像的恢复是影响图像信息的一个重要因素,提出了一种新的滤波算法,该算法首先利用阀值把噪声和图像像素区分开来,再对像素进一步区分出脉冲噪声和图像像素,最后对脉冲噪声用改进的加权中值滤波器滤波。仿真结果表明,该方法对脉冲噪声有很好的抑制作用,而且较好地保存了图像细节和结构信息,证明该方法具有实用性和有效性。     

含噪图像滤波方法及MATLAB实现

根据图像退化的数学模型,讨论了图像滤波的几种可行方法,并给出了MATLAB实现的实例。     

动态卡尔曼滤波综述

随着动态定位技术的发展,对于滤波算法提出了新的要求.本文在对当前动态滤波算法的发展及其相关比较的基础上,找出了各种算法之间的差异与不足,并对今后卡尔曼滤波的发展趋势进行了预测.     

基于双边滤波与小波变换的分频滤波算法的分析

针对图像在滤波时把图像的一些特征信息去除和图像分割边缘模糊的问题,提出了基于双边滤波和小波变换的分频滤波算法.通过二代小波提升变换后,得到图像的高频分量和低频分量,然后结合双边滤波和小波变换各自的优缺点,在低频分量部分采用双边滤波,在高频分量部分采用阈值小波变换,通过Matlab仿真结果分析,该方法在滤波过程中有很明显的优势.     

滤波反投影图像重建算法研究

CT是一种先进的成像技术,被广泛应用于工业无损检测和医学图像处理中。目前CT图像重建算法多采用滤波反投影算法。本文介绍了滤波反投影算法的基本原理,讨论了滤波函数的设计,给出了采用该算法的计算机仿真重建结果。实验结果表明,重建精度依赖于具体的滤波函数．而且在投影数据完全时可获得较高质量的重建图像。     

电力系统中谐波的危害和抑制

本文针对由于当前工矿企业大量使用的非线性负载,尤其是电力电子装置和变频调速装置,在电力系统中产生谐波的问题进行了分析。对谐波的产生和谐波的危害二方面进行了研究和探讨,找出了多种抑制谐波的方法。     

数字滤波技术

工业系统遇到干扰时，会出现不稳定的问题，对此探讨了几种用数字滤波技术对信号进行处理的方法，即算术平均值法、中值滤波法、低通滤波法、滑动滤波法．     

基于小波分析的图像去噪

针对图像去噪展开研究,结合均值滤波技术和小波分析技术,提出了使用高斯平滑滤波与小波局部阈值处理相结合的方法。首先对图像进行高斯平滑滤波,然后选取适当的小波阈值对小波系数进行处理、重构得到新的图像,并将去噪图像的峰值信噪比作为性能指标,仿真实验结果表明文中所用的方法去噪效果更佳,图像有着更好的视觉效果。     

基于蚁群优化的边缘化粒子滤波器跟踪算法

针对边缘化粒子滤波器(MPF)中的Kalman滤波通常无法从量测方程中获得线性状态估计,以及标准粒子滤波器估计非线性状态计算量大和粒子退化的问题,提出了一种改进的MPF粒子滤波目标跟踪算法。该方法采用状态的预测值作为Kalman粒子滤波的量测更新,用Kalman滤波估计目标的速度和加速度,并通过蚁群优化算法改进标准粒子滤波器,并用以估计目标的位置信息。仿真结果表明:该方法在提高目标状态估计精度的同时,降低了粒子滤波的计算复杂度,克服了粒子滤波退化现象。     

胡主席在印度,我却在中国

Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer.     

对海德格尔“人(此在)是澄明”的再思考

西方传统哲学对人的思考严格遵循主—客的思维模式,大力弘扬主体性原则,崇尚“人类中心主义”。而自西方现当代人文思潮产生以来,对人的理解发生了转向,弘扬非理性,倡导人与自然的融合。海德格尔就是这种思潮的代表。文章从本体论和认识论两个维度对海氏“人（此在）是澄明”这一哲学命题作出了新的解释。     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.     

A survey of anatomy and physiology pedagogy and lifestyle factors in undergraduate medical students in Zimbabwe

Abstract

Studies on health pedagogy in medical students in African universities are lacking. The aim of the current investigation was to assess the following pedagogy influences on second year Zimbabwean medical students’ well-being. A group of 100 students studying Physiology and Anatomy in MBChB. II program at the University of Zimbabwe College of Health Sciences were asked to voluntarily complete a structured questionnaire. As Physiology was examinable, students desired to practice MCQ questions. Dissection was regarded as excellent for medical knowledge. The stress of study probably necessitated the drinking of alcohol. Most of the respondents did not actively smoke. Although students knew about calories, they were unaware of the daily requirements. Their diets were mostly balanced. Music helped alleviate stress. Stress levels were high although no overwhelming effects on general health were observed. IT use was rated well although the slow internet was problematic. We encourage more studies on medical students in central and southern Africa.     

The golden thread: educator connectivity as a central pillar in the development of creativity through childhood education. An Irish life history study

This paper presents the narratives of five creative Irish Adults who contributed to the study by sharing their childhood education experiences. The five participants are all of different ages and occupations. All identify themselves as highly creative people and all worked with me over the course of this study to identify how this creativity developed within their engagement with the Irish childhood education system. All excelled with higher education and they share a high degree of success within their careers. Between them, they express their creativity across five key genres. These are: Science, Engineering, The Arts, Entrepreneurship and Social Entrepreneurship. Well-developed themes were analysed to identify interrelationships which formed a theoretical framework of core concepts that demonstrate what holds great importance in the lives of these participants for the development of their creativity during childhood education in Ireland. A clear theme of this study was that of connectivity. Connections and relationships matter greatly. The creative journey is joyful and clear where children experience a positive connection with their educator. Conversely, the creative journey is stymied by a lack of connection or by a negative connection. These stand in the way of creative growth, like a big boulder on the child's developmental path. This paper showcases, through the stories of these five research participants, how creativity development is affected by the connection between the child and their educator.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

An Archetypal Reading of Toni Morrison''s Nobel Lecture

Toni Morrison is widely recognized as American's preeminent novelist.As the Pulitzer Prize and Nobel Prize winning novelist,her stature as a post war American novelist can be no doubt compared to that of great novelists like Hemingway and Faulkner.Historically alert,Toni Morrison magnificently explores the life of the black,especiaiiy that of black women.Her Nobel Prize Lecture.in which she again tells a story of a black wom- an.can be regarded as an epitome of Mortison's works.The dialogue between the blind black old woman and the young people is full of wisdom and profoundness.Like many great works,Morrison's Lecture can also be traced back to some ancient archetypes,this thesis attempts to use archetypal theories to probe into the archetypes in Toni Morrison's Nobel Prize Lecture from characters, and theme.These archetypes denote deeper meaning of the author.     

Reconstructing masculinity and power in Africa through open distance learning for sustainable development： A critical analysis of Wole Soyinka＇s Climate of Fear

The strabismus conception of masculinity and power with its manipulation as reflected in the consequences of actions endorsed and demonstrated by leaders, followers, citizens as individuals and groups at different times in the past, and present has been a major source of the seemingly quiescence and underdevelopment in Africa. Masculinity has often been associated with being athletic, breadwinner, objective, sexually aggressive, unemotional, dominating, etc.; while power is frequently construed as a tool of dominance, authority, superiority, influence, and governance. This inapt perception was borne out of Africa＇s nictitating and ignorance. The consequences of the misconception include abuse of power, intolerance, intimidation, militancy, humiliation, insecurity, inadequate dialogic tools and opportunities, etc. These result in the Climate of Fear as being experienced in the Niger-Delta of Nigeria, Kenya, and other parts of Africa. Thus, this paper examines the concepts of masculinity and power with exemplification from Africa with Wole Soyinka＇s Climate of Fear. The research methodology employs a combination of critical discourse analysis and Halliday＇s systemic functional theory of grammar with sociolinguistics approaches for the analysis. The study posits that the root of the problems that abound in Africa is traceable to the lack of precise socio-cultural, political and philosophical ideologies by Africans. The research opines that these fundamental problems of Africa can be resolved through orientation with education for all, which is one of the challenges of the millennium development goals. Thus, the paper examines the contrivance of open distance learning and its role in the education of African citizenry. It concludes on the ground that open distance learning as a recent and welcomed information technological development in Africa, if properly channeled and adequately funded would enhance sustainable development in Africa by its elimination of some of the aforementioned obstacles.     

The Reader Response Approach to Teaching of English Literature

During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context.