today bought a book, reflected good to upload source code package. 1. Based on the struts of customer information management system 2. Struts-based personnel management system 3. Office log system 4. E-government management system 5. Food industry Invoicing System 6 SMS Data Acquisition System
標簽： reflected custome package bought
上傳時間： 2014-07-09
上傳用戶：baitouyu
隨著系統設計復雜性和集成度的大規模提高，電子系統設計師們正在從事100MHZ以上的電路設計，總線的工作頻率也已經達到或者超過50MHZ，有一大部分甚至超過100MHZ。目前約80% 的設計的時鐘頻率超過50MHz，將近50% 以上的設計主頻超過120MHz，有20%甚至超過500M。當系統工作在50MHz時，將產生傳輸線效應和信號的完整性問題；而當系統時鐘達到120MHz時，除非使用高速電路設計知識，否則基于傳統方法設計的PCB將無法工作。因此，高速電路信號質量仿真已經成為電子系統設計師必須采取的設計手段。只有通過高速電路仿真和先進的物理設計軟件，才能實現設計過程的可控性。傳輸線效應基于上述定義的傳輸線模型，歸納起來，傳輸線會對整個電路設計帶來以下效應。 · 反射信號reflected signals · 延時和時序錯誤Delay & Timing errors · 過沖(上沖/下沖)Overshoot/Undershoot · 串擾Induced Noise (or crosstalk) · 電磁輻射EMI radiation
上傳時間： 2013-11-16
上傳用戶：lx9076
首先研究CAN總線和SAE J1939協議，提出一種基于MC9S12HZ256微控制器的總線式汽車數字儀表解決方案。詳細介紹SAE J1939協議的報文幀格式及應用層協議中發動機相關參數的定義，以及步進電機及其驅動和車速信號的處理方法。該數字儀表系統硬件平臺由微處理器和信號采集和信息處理及顯示等模塊組成。軟件設計部分編程實現了對CAN總線和各傳感器數據的讀取、處理。該系統能夠實時反映車輛工況。 Abstract: In this paper，CAN bus and SAE J1939protocol are researched，and a vehicle digital instrument solution based on MC9S12HZ256MCU is proposed.The message frame format and some engine-related parameters’definition in SAE J1939application layer protocol are introduced in detail.Stepper motor and its driver，the methods of speed signal process-ing are also introduced.The hardware platform of vehicle digital instrument is composed by MCU，signal acquisition mod-ule，and signal processing and displaying module.Data receiving and processing from CAN bus and sensors are accom-plished by programming，and vehicle condition can be reflected in real-time.
上傳時間： 2013-10-20
上傳用戶：huannan88
隨著系統設計復雜性和集成度的大規模提高，電子系統設計師們正在從事100MHZ以上的電路設計，總線的工作頻率也已經達到或者超過50MHZ，有一大部分甚至超過100MHZ。目前約80% 的設計的時鐘頻率超過50MHz，將近50% 以上的設計主頻超過120MHz，有20%甚至超過500M。當系統工作在50MHz時，將產生傳輸線效應和信號的完整性問題；而當系統時鐘達到120MHz時，除非使用高速電路設計知識，否則基于傳統方法設計的PCB將無法工作。因此，高速電路信號質量仿真已經成為電子系統設計師必須采取的設計手段。只有通過高速電路仿真和先進的物理設計軟件，才能實現設計過程的可控性。傳輸線效應基于上述定義的傳輸線模型，歸納起來，傳輸線會對整個電路設計帶來以下效應。 · 反射信號reflected signals · 延時和時序錯誤Delay & Timing errors · 過沖(上沖/下沖)Overshoot/Undershoot · 串擾Induced Noise (or crosstalk) · 電磁輻射EMI radiation
上傳時間： 2013-11-05
上傳用戶：tzrdcaabb
The MATLAB coding style, project options and synthesis directives can have a significant effect on the final results. Knowledge about how a particular algorithm should be implemented in hardware can be reflected in the MATLAB code to improve the results. In doing so, the MATLAB loses a bit of its abstraction but the lower-level MATLAB will infer the desired architecture into the device.
標簽： significant directives synthesis project
上傳時間： 2013-12-03
上傳用戶：13517191407
A new cable fault location method based on wavelet reconstruction is proposed. In this method the difference between the currents of faulty phase and sound phase under the high voltage pulse excitation is used as the measured signal and is decomposed in multi-scale by wavelet transform, then reconstructed in single scale. Comparing with traditional fault location method by travelling wave, the presented method will not be interfered by the reflected wave from the branch joint of cables or from other positions where the impedances are not matched and not be influenced by fault types, otherwise, the reflected waves can be recognized even the faulty position is near to the measuring terminal, at the same time, the influence of the wave speed uncertainty can be reduced. The correctness of the proposed method is proved by simulation results.
標簽： method reconstruction location proposed
上傳時間： 2016-02-04
上傳用戶：maizezhen
Someone who wants to get to know the customs of a country frequently receives the advice to learn the language of that country. Why? Because the dif- ferences that distinguish the people of one country from those of another are reflected in the language. For example, the people of the islands of the Pacific do not have a term for war in their language. Similarly, some native tribes in the rain forests of the Amazon use up to 100 different terms for the color green.
上傳時間： 2020-05-27
上傳用戶：shancjb
This book was born from the perception that there is much more to spectrum use and sharing than one sees reflected in publications, whether academic, commercial or political. the former – in good research style – tend towards reductionism and concentrate on specific, detailed aspects. commercial publications tend to empha- size the positive aspects and they tend to put promise above practice. Given the ever increasing pace of technology development and recent successes of new wireless technologies, some pundits predict large-scale spectrum scarcity, potentially lead- ing to economic catastrophe. Although economic theory has a hard time explaining recent events that shook the world economy, the notion of spectrum scarcity is intui- tively acceptable, even if not correct or immediately relevant.
上傳時間： 2020-06-01
上傳用戶：shancjb
近距電能傳輸——高效安全近距電能傳輸一般基于電磁感應原理進行。在此技術基礎上，當接收器鄰近發射器時才會進行電能傳輸。電磁感應技術的歷史長達百年，多年米一直應用于各類電子產品中—如此普及全因其簡單、高效以及安全技術概覽以下將為你簡要介紹無線電能傳輸技術。System Overview(Communication)Receiver sends messagesTo provide control information to the transmitterBy load modulation on the power signaTransmitter receives messagesTo receive control information frorn the recelverBy de-modulation of the reflected loadPower Pick Up( Receiver)Secondary coil (L Serial resonance capacitor (C) for efficient power transfer Parallel resonance capacitor(C, )for detection purposes Rectifier: full bridge(diode, or switched)+ capacitor Output switch for(dis)connecting the loadReceiver modulates load by Switching modulation resistor(R,n),or Switching modulation capacitor(Ca)Transmitter de-modulates reflected load by Sensing pnmary coil curent (p)and/o Sensing primary coil voltage (V,
上傳時間： 2022-03-31
上傳用戶：
