一种远程LED照明监控系统的设计

利用STC单片机结合以太网驱动模块,设计一种基于以太网的远程发光二极管(LED)照明监控系统.该以太网驱动模块由RTL8019以太网芯片及相关外围电路组成,利用电量采集芯片AD7755对整个系统所耗电量进行采集,采用大功率LED恒流驱动方案,并利用可调光芯片CAT4109和脉宽调制(PWM)技术对LED灯实现调光.结果表明:设计的系统可实时采集系统所耗电量,可对灯的亮度、色温进行远程调节.     

LED路灯模拟控制系统的设计与实现

设计了一套LED路灯模拟控制系统。系统采用单片机控制,由支路控制器和单元控制器构成,控制器间采用多机串行通信方式通信,以两路1W的LED灯控制系统模拟两个单元控制器,采用恒流电路驱动,通过多种控制方式,如定时控制、根据环境光线明暗控制、根据交通情况控制及LED灯的短路和断路故障报警等,实现了LED灯的节能和智能控制。制作表明,本系统达到了较高的技术指标.     

简易LED点阵显示屏系统的设计

本文介绍了一种简易LED显示系统的设计与实现。该系统由单片机和8个LED灯组成,可实现图文显示,能完成LED点阵显示屏的基本功能,并且可根据情况实现图形显示的形状。文中给出了具体的硬件电路和软件设计,并对硬件和软件进行了介绍,经实物证明,该设计显示稳定可靠。     

大功率LED灯强化冷却散热器的创新设计

LED灯由于节能、环保、工作寿命长等特点而倍受社会各界的关注,然而大功率LED灯在工作过程中,除发光外同时产生大量热能,约有80%的能量转化为热能。随着LED的功率以及集成度的提高,LED灯的发热热流密度迅猛增加,其工作过程中散发热量大幅提高,而LED结温(芯片温度)的高低直接影响灯的使用寿命;因此,大功率LED灯的散热问题急需改善。本设计针对LED灯散热问题日益严重的现象而提出,设计出一种自然回流散热系统,使LED灯工作过程中产生的大部分热量通过回流系统散发出去,实验证明该散热系统能取得良好的散热效果。     

轨道车辆车厢LED照明控制系统

结合LED节能环保、超长寿命的优点,采用了恒流驱动方式。以STC89C51单片机为控制核心,采用PWM技术对LED灯发光强度进行控制,通过亮度传感器采集车厢内的亮度信息,对车厢内LED照明系统进行亮度调节。仿真结果表明,系统LED发光亮度均匀,达到了设计要求。     

基于MSP430的新型LED调光系统

文中设计了一种基于MSP430单片机的新型LED无线遥控调光系统。该系统驱动电源部分采用单端反激式开关电源拓扑结构,采用MAXl6822作为LED的恒流驱动器。调光部分采用MSP430F149单片机作为控制核心,利用定时器的精确定时来产生占空比可调的PWM信号对LED灯进行调光。无线控制模块采用体积小、功耗低、成本低的红外遥控,实验结果显示所设计的LED调光系统效率高、满足大功率LED照明的电压电流工作要求,具有良好的无线调光功能。     

电子扑克游戏机的设计与实现

使用单片机最小系统、二位一体数码管、LED灯等器件设计并实现了电子扑克游戏机,使用二位一体数码管显示1～13之间的数字,用于区分每张牌的点数,每个二位一体数码管下面安装4个LED灯,4个LED灯的颜色不同,每次只有一个被点亮,用于区分每张牌的花色。采用74HC595芯片进行单片机端口扩展。电子扑克游戏机可代纸牌进行游戏,克服了纸牌游戏偷牌、换牌、看牌等诸多弊端。也可用于大学生实习、实训、创新创业训练等。     

高校教室照明节能系统的设计

本文实现教室照明节能系统的设计,采用STC-AT89C52RD单片机实现控制系统的设计。该系统主要由传感器电路、控制电路、数码显示及模拟灯等部分组成。系统采用红外对射式传感器检测教室人数,通过单片机控制点亮相应照明灯的个数。该系统能精确检测人应对意外情况的需求。     

民用机场LED停止排灯光学设计

随着LED光效的不断提升,其作为照明光源的技术也在不断探索发展中,这使得LED应用于民用机场灯光系统中成为可能.设计了一种民用机场滑行道LED停止排灯的光学系统,在光学设计软件Tracepro中建立模型进行了追迹模拟仿真,并通过分布式光度计测试其光学输出效果.实验结果证明,该系统结构可靠,光度学性能均达到国家标准的要求.该系统相比传统的卤钨灯光源,具有功率低、寿命长、抗震度好、低污染等优点,并且在提高整灯寿命的同时降低了整灯功率,符合国家"节能减排"的政策.     

基于单片机的高亮度LED应用设计

介绍了基于AT89C51单片机和高亮LED灯的简易LED显示棒设计原理,给出了设计原理框图、主要硬件电路设计及软件流程图,指出所设计的LED显示棒性能可靠,成本低,能清晰地显示字符、图像,并可显示简单动画图案.     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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-