The book is written for those concerned with the design and performance of satellite communications systems employed in fixed point-to-point, broadcasting, mobile, radio- navigation,data-relay,computercommunications,andrelatedsatellite-basedapplications.The recentrapidgrowthinsatellitecommunicationshascreatedaneedforaccurateinformationon both satellite communications systems engineering and the impact of atmospheric effects on satellite link design and system performance. This book addresses that need for the first time in a single COMprehensive source.
標(biāo)簽： Communications Satellite Systems
上傳時間： 2020-06-01
上傳用戶：shancjb
This effort started as an answer to the numerous questions the authors have repeatedly had to answer about electrostatic discharge (ESD) protection and input/output (1/0) designs. In the past no COMprehensive book existed suffi- ciently covering these areas, and these topics were rarely taught in engineering schools. Thus first-time I/O and ESD protection designers have had consider- able trouble getting started. This book is in part an answer to such needs.
標(biāo)簽： Design Basic ESD and IO
上傳時間： 2020-06-05
上傳用戶：shancjb
This book provides a COMprehensive overview of the technology behind the pico-solar revolution and offers guidance on how to test and choose quality products. The book also discusses how pioneering companies and initiatives are overcoming challenges to reach scale in the market- place, from innovative distribution strategies to reach customers in rural India and Tanzania, to product development in Cambodia, product assembly in Mozambique and the introduction of ‘pay as you go’ technology in Kenya.
標(biāo)簽： Pico-solar Electric Systems
上傳時間： 2020-06-07
上傳用戶：shancjb
CAMS設(shè)備用戶管理功能技術(shù)白皮書1 介紹 隨著網(wǎng)絡(luò)規(guī)模的增長，網(wǎng)絡(luò)環(huán)境也越來越復(fù)雜，企業(yè)網(wǎng)絡(luò)的骨干架構(gòu)常常會由許多 的服務(wù)器、網(wǎng)絡(luò)設(shè)備所連接，負(fù)責(zé)系統(tǒng)、網(wǎng)絡(luò)或信息安全的管理者經(jīng)常需要登錄網(wǎng) 絡(luò)里的各臺重要設(shè)備，進(jìn)行例行維護(hù)、故障修復(fù)或安裝最新修補程序等諸多操作。 而登錄不同設(shè)備的用戶名和密碼管理則成為網(wǎng)絡(luò)管理中最重要的環(huán)節(jié)之一。 目前常見的情形是管理員的用戶名和密碼分散存儲在各個需要進(jìn)行日常管理的網(wǎng)絡(luò) 設(shè)備中，同一用戶在多臺網(wǎng)絡(luò)設(shè)備中擁有多套身份和密碼，而同一網(wǎng)絡(luò)設(shè)備中又可 能保存多套用戶身份、權(quán)限信息。在一個大型網(wǎng)絡(luò)中，需要管理員遠(yuǎn)程登錄進(jìn)行管 理的網(wǎng)絡(luò)設(shè)備往往數(shù)量眾多。如果增加一個設(shè)備管理員，用戶可能需要在數(shù)十臺網(wǎng) 絡(luò)設(shè)備上都做相應(yīng)的管理員信息配置，同時用戶的每一個密碼都可能受到不同規(guī)則 的制約，支持不同安全級別的訪問，而且還有不同的期限。顯而易見，這不僅導(dǎo)致 網(wǎng)絡(luò)維護(hù)的不便，還容易引起密碼混亂，存在安全隱患。 因而針對上述問題，H3C CAMS綜合訪問管理服務(wù)器提供設(shè)備用戶管理功能，統(tǒng) 一管理網(wǎng)絡(luò)中多臺設(shè)備的管理用戶信息。 2 CAMS設(shè)備管理用戶功能介紹 H3C CAMS（COMprehensive Access Management Server）綜合訪問管理服務(wù)器 是一個集事前認(rèn)證、事中監(jiān)控、事后審計和業(yè)務(wù)管理為一體的多業(yè)務(wù)安全接入管理 平臺。 設(shè)備用戶管理功能可以對設(shè)備管理用戶（CAMS系統(tǒng)提供的對配合CAMS系統(tǒng)中的 各種網(wǎng)絡(luò)設(shè)備完成設(shè)備管理工作的管理員用戶）進(jìn)行管理。這里所說的設(shè)備管理用 戶不同于CAMS系統(tǒng)維護(hù)的可進(jìn)行接入認(rèn)證的帳號和卡號用戶，不能用于提供寬帶 網(wǎng)絡(luò)服務(wù)，不提供帳務(wù)管理功能。 設(shè)備用戶管理功能可以對被管理的網(wǎng)絡(luò)設(shè)備設(shè)定可以訪問設(shè)備的用戶主機IP地址范 圍（可以隸屬于不同的多個網(wǎng)段），并對不同用戶設(shè)置不同的訪問服務(wù)類型
標(biāo)簽： cams
上傳時間： 2022-02-27
上傳用戶：
近年來反季節(jié)種植已成火熱趨勢,溫室大棚的普及十分迅速,而溫室大棚對自動化、智能化的要求也越來越迫切,本系統(tǒng)將溫室大棚的溫濕度、二氧化碳濃度各個方面的檢測,通風(fēng)、澆灌、溫度、噴灑農(nóng)藥等各個方面的控制進(jìn)行綜合系統(tǒng)研究,實現(xiàn)溫室大棚對自動化、智能化的要求。這一系統(tǒng)是基于單片機控制的智能檢測,控制系統(tǒng)包含單片機主控模塊、感應(yīng)檢測模塊、傳感模塊,顯示、控制模塊等[1]。從而提高溫室大棚的種植效率,減少勞動力,提高利潤等。In recent years,counter-season planting has become a hot trend featuring the rapid popularization of greenhouse and urgent requirement for the automation and intellectualization of greenhouse.This paper offers a COMprehensive and systematic study of the monitoring of temperature,humidity and carbon dioxide concentration in the greenhouse and the control of ventilation,irrigation,temperature and pesticide spraying in order to achieve automation and intellectualization in greenhouse.This system is based on the intelligent detection controlled by single chip computer with the control system including the main control module,induction detection module,sensing module,display and control module of single chip computer,which is effective in improving planting efficiency of greenhouse,reducing labor force and increasing profits.
標(biāo)簽： 智能溫室大棚 控制系統(tǒng)
上傳時間： 2022-03-27
上傳用戶：
設(shè)計了自動控制系統(tǒng)綜合實驗案例“基于LabVIEW和單片機的溫度控制系統(tǒng)設(shè)計”。實驗系統(tǒng)硬件部分由單片機、溫度傳感器、D/A轉(zhuǎn)換模塊、調(diào)壓模塊和電烤箱組成,設(shè)計了單片機與各個模塊之間的接口電路。軟件部分采用LabVIEW軟件實現(xiàn)控制算法,并設(shè)計監(jiān)控界面實現(xiàn)參數(shù)設(shè)定、溫度數(shù)據(jù)實時監(jiān)控等功能。設(shè)計了單片機與LabVIEW軟件之間的串口通信程序,實現(xiàn)了輸入、輸出數(shù)據(jù)的傳輸。通過綜合實驗系統(tǒng)設(shè)計,使學(xué)生得到控制系統(tǒng)設(shè)計和實驗調(diào)試等綜合能力的訓(xùn)練。A COMprehensive experimental case of the automatic control system is presented,which is the design of the temperature control system based on LabVIEW and SCM.The hardware part of the experimental system is composed of the SCM,temperature sensor,D/A conversion module,voltage regulating module and electric oven.The interface circuit between the SCM and each module is designed.In the software part,LabVIEW software is used to realize the control algorithm,and the monitoring interface is designed to realize the functions of parameter setting,temperature data real-time monitoring,etc.The serial communication program between the SCM and LabVIEW software is designed to realize the transmission of input and output data.Through the design of this COMprehensive experimental system,students can get the COMprehensive ability training for the control system design,experiment debugging,etc.
標(biāo)簽： labview 單片機 自動控制系統(tǒng)
上傳時間： 2022-03-27
上傳用戶：qdxqdxqdxqdx
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