太阳能高压气体放电灯智能控制系统

为了提高太阳能高压气体放电灯照明效率,延长照明时间,实现智能充放电控制、智能照明控制,提出一种新型太阳能高压气体放电灯照明控制系统。系统充电控制策略实现了最大功率点跟踪技术和蓄电池三段式精确充电,照明控制策略采用变开关频率控制和恒功率控制。硬件结构采用单级式逆变结构,减少了硬件成本开销,提高了能量转化率。实验结果表明:该系统延长了蓄电池寿命及点灯时间,提高了电灯效率,效率达90%以上,使得太阳能高压钠灯照明系统智能、高效、稳定的运行。     

基于单片机太阳能路灯模型的设计

利用STC12C5410AD单片杌作为控制电路的核心,设计一款太阳能照明系统智能控制器,实现了对蓄电池的快充、浮充、停充等充、放电管理策略。根据环境光照强度不同进行了照明系统的智能开关电路设计,实现了系统的无人控制。编制了软件程序,进行了样机设计及制作,实验结果验证了硬件电路和程序设计的正确性及方案的可行性。     

基于PIC微控制器的光伏照明系统

本论文主要阐述了基于PIC微控制器,实现基于单片机的太阳能光伏照明系统的总体方案和主要技术。论文重点分析了控制器的低功耗关键技术和低成本实现方案,并就对蓄电池充电和负载亮度调整问题进行了分析;在硬件设计的基础上,论文对软件控制的设计要点和软件运行流程进行了分析。     

太阳能家用照明装置单片机自动控制器

为了缩短充电时间,提高充电效率,太阳能家用照明装置自动控制器能在充电过程中实时跟综蓄电池充电电压、电流、温度和太阳能蓄电池的电压,通过单片机硬件软件资源动态调整蓄电池充电电压、电流和控制用户照明装置,使蓄电池充电效率达到最佳效果,太阳能利用率达到最高。     

太阳能照明系统优化设计

针对目前市场上的太阳能路灯控制器,存在可靠性不高、利用率不高、性价比不高的现状,本文基于单片机控制搭建的太阳能照明系统,从太阳能最大功率跟踪,蓄电池的充电控制,路灯驱动调光等方面进行了研究和改进,同时为了达到高的照明效率,本文使用了具有小体积、长寿命以及低能量消耗的大功率白光LED灯,并根据照明的需求以及蓄电池存储的能量多少,采取分段控制LED灯的照明亮度,进一步达到节能效果。     

基于太阳能LED照明系统的研究

由于能源紧张问题日趋严重,近年来太阳能光伏发电和LED开始引起了人们的关注.文章介绍了将两者结合应用于太阳能LED照明系统,着重分析该系统中的DC-DC转换器、蓄电池、MCU控制器等各个组成部分的配置原则,使得系统能简单可靠地实现智能控制,进而提出一种新颖的充电控制方法.     

水泥工艺篦冷机的仿人智能控制器设计

针对篦冷机滞后性强、系统非线性、无法直接观测料层厚度等工艺难点,提出运用仿人控制的思想,采取多点观测和优先控制的策略,设计包括变积分的PI控制器、Bang Bang控制器、偏差校正控制器以及趋势异常校正控制器在内的仿人智能控制器。将该控制器应用于实际水泥生产线上,运行结果表明,仿人智能控制器在运行中不仅节省人工投入实现了自动控制,而且将篦冷机的风室风压、油压以及风机电流控制在一定范围内,使工况更加稳定。     

LED太阳能路灯控制器的设计

根据LED太阳能路灯系统特点,设计了太阳能路灯控制器.详细说明了蓄电池充电控翻及负载输出控制的硬件设计原理,并采用三段式充电理论实现了控制器的软件设计.控制器功能易于实现,满足控制和环保节能的要求.     

基于嵌入式太阳能LED照明驱动系统设计与实现

从高效利用绿色能源的角度出发,设计了一款新型的基于嵌入式技术的太阳能LED照明驱动系统.系统采用太阳能电池发电并对其进行实时检测,利用PWM对升降压DC/DC转换器进行控制以实现最大功率点跟踪充电控制和蓄电池的智能管理,利用LED照明以提高能源利用率.系统工作可靠性,具有实用性及环保性.     

基于ATMEGA16的铅酸蓄电池充放电控制器的设计

为了保护离网型太阳能系统中的铅酸蓄电池,实际设计了基于ATMEGA16单片机为控制芯片的太阳能铅酸蓄电池充放电控制器.该控制器的设计主要包括主电路拓扑结构的选择,蓄电池充放电控制策略的研究.在此基础上设计了基于C语言的控制程序,并且对各部分电路进行了测试,得到的实际测试充放电数据与理论分析的一致.     

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     

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     

Journal of Donghua University ( English Edition) Contents of Volume 31

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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has