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  • a function for calculating specific volume for ideal gas

    a function for calculating specific volume for ideal gas

    標簽: calculating for function specific

    上傳時間: 2014-01-25

    上傳用戶:yepeng139

  • Fluid catalytic cracking of petroleum fraction

    Fluid catalytic cracking of petroleum fraction (vacuum gas oil) to produce gasoline

    標簽: 石油

    上傳時間: 2022-01-14

    上傳用戶:

  • 基于GNU工具鏈的ARM-MINIX嵌入式系統(tǒng)交叉編譯環(huán)境的移植.pdf

    信息技術的發(fā)展,數(shù)字化產(chǎn)品的普及,導致了對嵌入式開發(fā)的巨大需求。以Linux為宿主機系統(tǒng),搭配一個交叉編譯環(huán)境,為嵌入式設備生成可執(zhí)行程序己成為現(xiàn)在日益流行的編譯嵌入式軟件的解決方案。而開放源代碼的GNUT具鏈是一套開源的開發(fā)環(huán)境,是嵌入式軟件開發(fā)中理想的交叉編譯器。但現(xiàn)有GNUI具鏈支持的平臺并不能滿足層出不窮的嵌入式產(chǎn)品的開發(fā)需要,仍有許多平臺得不到支持,例如我們進行的minix向ARM-MINIX平臺的移植。 本文以在linux環(huán)境下構建MINIX嵌入式系統(tǒng)的交叉編譯工具鏈為背景,首先介紹了交叉編譯系統(tǒng)的基本組成和結構,以及利用GCC構建交叉編譯環(huán)境的優(yōu)越性。然后對目標平臺作了介紹。分析了GCC編譯器,說明了GCC的設計思想,系統(tǒng)結構,介紹了GNU Binutils的功能,使用方法;接著分析了GNU工具鏈中的GAS和GLD的實現(xiàn)機制及源代碼結構,由于BFD是GNUBinutils的基礎,GAS和GLD都是使用BFD庫來操作目標文件,因此在這一部分本文對BFD庫的工作機制,數(shù)據(jù)結構也作了重點分析。緊接著說明了GCC交叉編譯系統(tǒng)的移植思路和方法,實現(xiàn)難點,以及一些相關技術細節(jié),這涉及到了若干重要的C源文件,Makefile,配置文件的修改,重點給出了BFD庫,GAS和GLD的分析及其重定向(通常GCC生成的目標程序是針對GNU/Linux系統(tǒng)的)的實現(xiàn);然后本文給出了在GNU/Linux宿主機上構建針對ARM-MINIX的參數(shù)設置及過程:最后對本文所做的工作進行了總結。

    標簽: ARM-MINIX GNU 嵌入式系統(tǒng)

    上傳時間: 2013-05-31

    上傳用戶:wangzhen1990

  • 基于ATmega16的標記機控制系統(tǒng)

    介紹了當前普通標記機控制系統(tǒng)現(xiàn)狀及其存在缺點,給出氣動標記機及相頻修正PWM模式的工作原理。采用ATmega16單片機和USB轉換RS232接口器件CH341T實現(xiàn)驅動控制系統(tǒng)與PC的實時通訊,標記控制系統(tǒng)可升級到USB接口。采用基于ATmega16的相頻修正PWM替換555振蕩電路產(chǎn)生的PWM,可直接通過軟件調整PWM信號。使用達林頓三極管TIP122替代直流繼電器驅動高頻電磁閥,使得電磁閥驅動電路簡單,成本低廉。該控制系統(tǒng)已成功應用于氣動標記機。 Abstract:  In this paper,the actuality and demerit of the common gas marking machine control systems are described.The operation principle of the gas marking machine and the phase and frequency correct PWM of ATmega16is introduced.The real-time communication between the driving control system and PC by CH341T which its function is translated USB to RS232is realized,the control systems is updated grade to USB interface.The PWM signal can be adjustable by software for the555surge circuit was substituted by the phase and frequency.The high frequency electromagnetic value’s driving circuit by DC relay is replaced by TIP122,therefore,the circuit is become simple and the cost cheap.The control systems has been widely used in gas marking machine.

    標簽: ATmega 16 標記 控制系統(tǒng)

    上傳時間: 2013-10-18

    上傳用戶:1427796291

  • 基于AT89C51的智能礦井環(huán)境質量監(jiān)控系統(tǒng)

     為滿足礦井安全生產(chǎn)要求,介紹了一種以AT89C51單片機為主控器,對環(huán)境空氣的溫度、有毒易燃氣體的濃度等進行檢測的監(jiān)控系統(tǒng)。該系統(tǒng)配合外圍電路能實現(xiàn)對上述環(huán)境指標的控制并存儲相關數(shù)據(jù)與上位PC機通信。它采用硬件抗干擾和軟件抗干擾技術,以確保整個系統(tǒng)工作的準確性。 Abstract:  In order to meet the needs of mine produce safety,a kind of intellignet mine ambient monotoring and control system based on AT89C51 is introduced.This system can detect the temperature of ambient of mine,the density of poisonous inflammable gas,combined external circuit.With its function part, this system can change above-mentioned elements.

    標簽: 89C C51 AT 89

    上傳時間: 2013-11-10

    上傳用戶:wendy15

  • 基于PIC16C711的脈沖點火控制器設計

     針對目前燃氣灶市場的狀況,提出一種基于PIC16C711單片機的燃氣灶脈沖點火控制器設計,具體包括有系統(tǒng)的組成和功能介紹、硬件電路設計及軟件功能實現(xiàn)。 Abstract:  Aiming at today’s gas cooker market, a pulse ignition controler design based on PIC16C711 is presented.The specific descriptions of system components and functions,hardware circuit design and software function are given.

    標簽: C711 PIC 16C 711

    上傳時間: 2013-10-31

    上傳用戶:zhqzal1014

  • 基于MSP430F149的無線環(huán)境監(jiān)測傳感器系統(tǒng)設計

    為了提高環(huán)境參數(shù)采集的自動化水平,提升效率,設計了無線傳感器系統(tǒng)。本系統(tǒng)運用了傳感器技術、通信技術和單片機技術,實現(xiàn)了對環(huán)境溫度、濕度、光照度以及可燃性氣體濃度等參數(shù)的檢測。它能夠實時地與上位機進行無線通信,滿足對環(huán)境參數(shù)實時監(jiān)測的要求。 Abstract:  In order to increase the degree of automation and improve the efficiency of the environment monitoring parameters,the wireless sensor system was developed.Combining with the technique of sensor,automatic monitoring,communication and single-chip microcomputer,it realized real-time monitoring environment parameters,such as temperature,humidity,illumination,concentration of com- bustible gas and so on.At the same time it can communicate with upper personal computers,satisfy the desire of real-time monitoring.

    標簽: 430F F149 MSP 430

    上傳時間: 2013-11-22

    上傳用戶:longlong12345678

  • 基于msp430單片機的便攜式數(shù)字傾角儀的研制

    介紹了一種基于MSP430系列單片機和ADXL203加速度傳感器的數(shù)字式傾角儀,它不僅可以實現(xiàn)水平度檢測,而且可以測量00~3600范圍內的任意傾角,分辨率可達O.1。。此外,由于該傾角儀輸出為數(shù)字結果,因此它也可以與其他的數(shù)字設備結合起來,組合成一個功能更加強大的儀器。該數(shù)字傾角儀可廣泛應用于建筑、機械、道路、橋梁、石油、煤礦和地質勘探等各種需要測量重力參考系下傾角的場合。關鍵詞:MSP430F133單片機;力敏傳感器;ADXL203加速度計;角度測量 Abstract:This paper presents a new style digital inclinometer which is developed on the basis of the MSP430F133 MCU and the ADXL203 dual axis aeeelerometer.This inclinometer not only can test levelness,but also can measure any angle between 0。and 360。with an accuracy of 0.1 O.In addition,its output is a digital result,which makes it possible to integrate itself with other digital devices to form a more functional unit.This inclinometer can be widely used in any construction site,oil field,coal-mine or geologic survey and SO on where it will provide the working people with convenience to measure any angles.Key words:MSP430F133 MCU;force sensor;ADXL203 accelerometer;angle measurement

    標簽: msp 430 單片機 便攜式

    上傳時間: 2013-11-14

    上傳用戶:lizhizheng88

  • 基于ZigBee技術的無線智能家用燃氣報警系統(tǒng)

    在研究傳統(tǒng)家用燃氣報警器的基礎上,以ZigBee協(xié)議為平臺,構建mesh網(wǎng)狀網(wǎng)絡實現(xiàn)網(wǎng)絡化的智能語音報警系統(tǒng)。由于傳感器本身的溫度和實際環(huán)境溫度的影響,傳感器標定后采用軟件補償方法。為了減少系統(tǒng)費用,前端節(jié)點采用半功能節(jié)點設備,路由器和協(xié)調器采用全功能節(jié)點設備,構建mesh網(wǎng)絡所形成的家庭內部報警系統(tǒng),通過通用的電話接口連接到外部的公用電話網(wǎng)絡,啟動語音模塊進行報警。實驗結果表明,在2.4 GHz頻率下傳輸,有墻等障礙物的情況下,節(jié)點的傳輸距離大約為35 m,能夠滿足家庭需要,且系統(tǒng)工作穩(wěn)定,但在功耗方面仍需進一步改善。 Abstract:  On the basis of studying traditional household gas alarm system, this paper proposed the platform for the ZigBee protocol,and constructed mesh network to achieve network-based intelligent voice alarm system. Because of the sensor temperature and the actual environment temperature, this system design used software compensation after calibrating sensor. In order to reduce system cost, semi-functional node devices were used as front-end node, however, full-function devices were used as routers and coordinator,constructed alarm system within the family by building mesh network,connected to the external public telephone network through the common telephone interface, started the voice alarm module. The results indicate that nodes transmit about 35m in the distance in case of walls and other obstacles by 2.4GHz frequency transmission, this is able to meet family needs and work steadily, but still needs further improvement in power consumption.

    標簽: ZigBee 無線智能 報警系統(tǒng)

    上傳時間: 2013-10-30

    上傳用戶:swaylong

  • 一個最常用的GA程序

    一個最常用的GA程序,可以以此為基礎,擴展出很多版本的GAs

    標簽: 程序

    上傳時間: 2013-12-21

    上傳用戶:shawvi

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