Flexible Construction of girth-six QC-LDPC Codes
標簽: Construction girth-six Flexible QC-LDPC
上傳時間: 2017-09-27
上傳用戶:gaojiao1999
Construction of Regular Gallagher Parity Check
標簽: Construction Gallagher Regular Parity
上傳時間: 2014-01-18
上傳用戶:csgcd001
compiler Construction
標簽: Construction compiler
上傳時間: 2019-04-03
上傳用戶:zsx097
Compiler Construction
標簽: Construction Compiler
上傳時間: 2019-04-03
上傳用戶:zsx097
Abstract: With the large number of analog switches on the market today, there are many performance criteria for a product designer to consider. This application note reviews the basic Construction of
上傳時間: 2013-11-09
上傳用戶:xiaohanhaowei
為了改變目前電網現場作業管理的變電巡檢、變電檢修試驗、輸電線路巡檢檢修等管理系統各自獨立運行,信息不能共享,功能、效率受限,建設和維護成本高的現狀,提出了采用B/S+C/S構架模式,將各現場作業管理模塊和生產MIS(管理系統)集成為一體的現場作業管理系統的設計方案,做到各子系統和生產MIS軟硬資源共享,做到同一數據唯一入口、一處錄入多處使用。各子系統設備人員等基礎信息來源于生產管理系統,各子系統又是生產管理系統的作業數據、缺陷信息的重要來源。經過研究試用成功和推廣應用,目前該系統已在江西電網220 kV及以上變電站全面應用。 Abstract: In order to improve the status that the substation field inspection system, substation equipments maintenance and testing system, power-line inspection and maintenance system are running independent with each other. They can?蒺t share the resource information which accordingly constrains their functions and efficiency, and their Construction and maintenance costs are high. This paper introduces a field standardized work management system based on B/S+C/S mode, integrating all field work management systems based on MIS and share the equipments and employee?蒺s data of MIS,the field work data of the sub systems are the source information of MIS, by which the same single data resouce with one-time input can be utilized in multiple places. After the research and testing, this system is triumphantly using in all 220kV and above substations in Jiangxi grid.
上傳時間: 2013-11-15
上傳用戶:han_zh
The latest generation of Texas Instruments (TI) boardmountedpower modules utilizes a pin interconnect technologythat improves surface-mount manufacturability.These modules are produced as a double-sided surfacemount(DSSMT) subassembly, yielding a case-less Constructionwith subcomponents located on both sides of theprinted circuit board (PCB). Products produced in theDSSMT outline use the latest high-efficiency topologiesand magnetic-component packaging. This providescustomers with a high-efficiency, ready-to-use switchingpower module in a compact, space-saving package. Bothnonisolated point-of-load (POL) switching regulators andthe isolated dc/dc converter modules are being producedin the DSSMT outline.TI’s plug-in power product line offers power modules inboth through-hole and surface-mount packages. The surfacemountmodules produced in the DSSMT outline use asolid copper interconnect with an integral solder ball fortheir
上傳時間: 2013-10-10
上傳用戶:1184599859
介紹了一種基于MSP430系列單片機和ADXL203加速度傳感器的數字式傾角儀,它不僅可以實現水平度檢測,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字結果,因此它也可以與其他的數字設備結合起來,組合成一個功能更加強大的儀器。該數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
上傳時間: 2013-11-14
上傳用戶:lizhizheng88
本文介紹了開關磁阻電機驅動系統(Switched Reluctance Drive, SRD)的發展概況、系統構成以及目前的研究熱點。 關 鍵 詞: 開關磁阻電機 研究熱點 Abstract:In this paper, development, Construction and research focus of Switched Reluctance Drive were introduced. Keywords: Switched Reluctance Motor Research focus 1 發展簡介 開關磁阻電機(Switched Reluctance Motor, SRM)最早可以追溯到1970年,英國Leeds大學步進電機研究小組首創一個開關磁阻電機雛形。到1972年進一步對帶半導體開關的小功率電動機(10w~1kw)進行了研究。1975年有了實質性的進展,并一直發展到可以為50kw的電瓶汽車提供裝置。1980年在英國成立了開關磁阻電機驅動裝置有限公司(SRD Ltd.),專門進行SRD系統的研究、開發和設計。1983年英國(SRD Ltd.)首先推出了SRD系列產品,該產品命名為OULTON。1984年TASC驅動系統公司也推出了他們的產品。另外SRD Ltd. 研制了一種適用于有軌電車的驅動系統,到1986年已運行500km。該產品的出現,在電氣傳動界引起不小的反響。在很多性能指標上達到了出人意料的高水平,整個系統的綜合性能價格指標達到或超過了工業中長期廣泛應用的一些變速傳動系統。下表是當時對幾種常用變速傳動系統各項主要經濟指標所作的比較。成本 1.0 1.5 1.0 美國、加拿大、南斯拉夫、埃及等國家也都開展了SRD系統的研制工作。在國外的應用中,SRD一般用于牽引中,例如電瓶車和電動汽車。同時高速性能是SRD的一個特長的方向。據報道,美國為空間技術研制了一個25000r/min、90kW的高速SRD樣機。我國大約在1985年才開始對SRD系統進行研究。SRD系統的研究已被列入我國中、小型電機“八五”、“九五”和“十五”科研規劃項目。華中科技大學開關磁阻電機課題組在“九五”項目中研制出使用SRD的純電動轎車,在“十五”項目中將SRD應用到混合動力城市公交車,均取得了較好的運行效果。紡織機械研究所將SRD應用于毛巾印花機、卷布機,煤礦牽引及電動車輛等,取得了顯著的經濟效益。 從上世紀90年代國際會議的上有關SRD系統的文章來看,對SRD系統的研究工作已經從論證它的優點、開發應用階段進入到設計理論、優化設計研究階段。對SR電機、控制器、功率變換器等的運行理論、優化設計、結構形式等方面進行了更加深入的研究。
上傳時間: 2013-10-11
上傳用戶:xjz632
為了能夠滿足基站易于選址、優質快速的建站要求和易維護、低成本、高可靠的運行要求,本文對以方艙來實現一體化結構基站做出一番探討。從系統設計的觀點闡述了移動通信高性能基站天線設計的幾個關鍵問題,介紹了智能天線技術在基站中的應用,并且用HFSS軟件仿真了一種新型的對稱陣子天線,該天線駐波比小于2的帶寬可以達到60%,具有良好的寬頻帶特性。 Abstract: In order to meet the station Construction requirement of easy site selection and fast base station, and meet the operational requirement of easy maintenance, low cost and high reliability, this paper discussed the unified architecture base station using shelter. Several key problems of high performance mobile communication base station antenna were illustrated from the view of system design, the application of smart antenna in base station was also introduced. And a novel dipole antenna was simulated by using HFSS, the VSWR of the antenna is less than 2, and the bandwidth was reach to 60%. So it has good broadband properties.
上傳時間: 2013-11-20
上傳用戶:linlin