面向FLASH存储器应用的电压自举电荷泵电路设计

基于SMIC 0.18μm 1P6M工艺,设计出一款面向FLASH存储器应用需求的开环电荷泵升压电路。该电路主要由振荡电路、分频电路、非交叠时序电路、电荷泵和高压选择电路组成。为实现电荷泵电压的自举,本设计采用高电压选择电路和开环无反馈结构电荷泵,通过调整电容比值,满足不同的输出升压需求。仿真结果表明,在电源电压为1.8 V、内部开关时钟频率为50 kHz、带载为5 mA的条件下,电荷泵的输出电压为3.3 V,纹波仅为10 mV,升压效率高达96%。与其他电荷泵相比,本设计提高了输出效率,可满足不同输出升压的需求。     

基于太阳能光伏电池组件的微芯片电源电路设计

采用无线通信技术实现太阳能光伏组件的电流、电压、温度等重要数据采集、传输、汇聚,一般必须安装数据采集和通信控制电路板在太阳能光伏组件板上.电路板上主控微芯片工作电压在3.3 V左右,若用太阳能光伏电池组件发电为微芯片提供电能,则有必要研究设计一种特殊的供电电路,该电路必须具备适于比较宽的输入电压范围,确保输出的低电压不变,工作效率高,考虑充分利用微芯片资源,简化设计,降低成本.针对CC2530微芯片设计研究一种自适应宽动态电源电路,该电路巧妙利用CC2530芯片中的MCU产生PWM波实现电源控制,获得稳定的3.3 V输出电压值,解决太阳能光伏的组件数据采集电路板安全稳定的供电问题.其创新之处在于实现了一片CC2530芯片采集数据、无线通讯和电源管理的目的,简化了电路,省去了传统采用的独立DC-DC电源模块.实验证明,基于CC2530芯片设计的自适应宽动态电源电路工作效率高,输出电压稳定.     

24V交流单相在线式不间断电源的设计

设计了一款输出24V交流单相在线式不间断电源。设计中采用正弦波单相逆变电源控制芯片U3990F6-50作为主控芯片;采用Boost升压电路对输入电压升压,使逆变之前的电压维持在40V以上,使电压和负载调整率大大提高了;采用恒压恒流的形式对蓄电池进行充电;电路具有过流保护,电池欠压报警及保护等功能。     

一种低功耗、高性能BICMOS DC-DC限流电路的设计

采用0.6μm BICMOS工艺,设计了一种高性能、低功耗的限流电路,并成功地将其应用于一款高效率、宽输入电压范围的DC-DC升压型开关电源管理芯片中.该电路作为整个芯片的核心模块,主要由限流比较器、软启动和斜坡补偿电路组成,其中限流比较器引入了动态偏置的思想,提高了电路性能,降低了功耗.分析了各个电路的设计原理和过程,并给出了芯片的仿真和测试结果.结果表明该比较器在电源电压为3.3 V时,增益达117 dB,总静态电流仅15μA.     

三代像增强器的高速选通控制设计

针对水下成像等主动探测应用的需要,设计了一种能够使三代微光像增强高速选通工作的控制电路。应用串联雪崩管电路原理,设计了一种适应三代光阴极的高速选通的控制装置,通过分析和试验,实现了选通控制电路的参数匹配,产生一个-800 V左右、频率125 Hz的选通脉冲,使三代像增强器光阴极能够在3.3、4.9和15.2 ns宽度的脉冲下高速选通工作;测试该选通的三代像增强器极限分辨率,结果表明其极限分辨率在各选通脉冲宽度下基本一致,与不选通时的极限分辨率相差不超过3.8%。     

一种新型光伏独立发电系统拓扑及控制策略

提出一种采用推挽输出的新型光伏独立发电主电路拓扑结构,系统由光伏电池阵列、充电器、蓄电池和逆变器组成.该逆变器能同时实现升压和逆变,省去了蓄电池之后的DC-DC升压部分.在简化主电路拓扑的同时,能够有效输出稳定的220 V交流电压.此外,该系统采用基于高频链SPWM调制方法及电压有效值外环、瞬时值内环的闭环控制策略.采用该系统不仅可以减小系统体积,降低系统成本,而且具有输出电压动态响应好、稳态精度高等优点.     

多重化大容量制氢电源的研究

针对传统的三相桥式晶闸管相控整流制氢电源的不足,提出新型不控整流桥加三相三重斩波电路的制氢电源主电路拓扑,采用DSP+FPGA设计了数字化整流电源控制器,具有多种故障保护功能、显示功能,开发出了多重化大容量制氢电源装置,仿真与现场运行状态良好.     

Buck+Boost电路级联的LED灯应急电源电路

本文提出了一款新型Buck+Boost电路级联的LED灯应急电源电路,设计核心是由MT7844S与MT7261组成的Buck升压电路与Boost降压电路,掉电控制电路与电池充电电路等组成,并通过掉电控制电路实现正常市电供电与应急备用电源供电切换,维持LED灯照明。本文中的Buck+Boost电路级联的LED灯应急电源电路能适应市电185 V-265V电压,控制电路结构简单,充电方式简洁,具备过压、过流保护,抗电磁干扰性能好,电压稳定性高,有较强的实际意义。     

高效率自举升压式OTL场输出电路的研究

提出一种高效率自举升压式OTL场输出电路,它可以在电源电压较低的情况下工作,满足逆程电压的需要,减少管上热损耗,使电源利用率提高10%左右.     

基于压电的传感器自供电系统设计方法

针对规模化养殖场通风状态监测的需求,设计风致振动压电俘能系统解决监测传感器自供电问题.自供电系统由压电俘能结构和能量管理电路组成,可将风能转换为电能.分析和测试结果表明压电式俘能结构可输出电压10.88 V,功率6.975 mW;LTspice软件仿真结果表明能量管理电路可实现电压转换,并稳定输出电压3.3 V.根据机械系统与电路系统的相似关系,对自供电系统整体建模,Matlab/Simulink软件仿真结果显示:压电俘能结构输出电压10.87 V、功率6.989 mW,自供电系统终端可输出3.3 V电压,结果与俘能结构和能量管理电路仿真、测试结果基本一致,说明系统整体建模正确,方案合理.通过现场测试,通风口处风速为2.6 m/s时,自供电系统能够输出电压3.3 V,为监测传感器稳定供电,该研究可在通风监测传感器自供电系统中广泛应用.      

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-