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judgment

  • This judgment day this year is the first few days

    This judgment day this year is the first few days

    標簽: judgment first This days

    上傳時間: 2015-10-06

    上傳用戶:invtnewer

  • Enter what day the first letter to a judgment as of the week, if the first letter, continue to judge

    Enter what day the first letter to a judgment as of the week, if the first letter, continue to judge the second letter.

    標簽: letter the first continue

    上傳時間: 2015-10-06

    上傳用戶:gdgzhym

  • UHF讀寫器設計中的FM0解碼技術

       針對UHF讀寫器設計中,在符合EPC Gen2標準的情況下,對標簽返回的高速數據進行正確解碼以達到正確讀取標簽的要求,提出了一種新的在ARM平臺下采用邊沿捕獲統計定時器數判斷數據的方法,并對FM0編碼進行解碼。與傳統的使用定時器定時采樣高低電平的FM0解碼方法相比,該解碼方法可以減少定時器定時誤差累積的影響;可以將捕獲定時器數中斷與數據判斷解碼相對分隔開,使得中斷對解碼影響很小,實現捕獲與解碼的同步。通過實驗表明,這種方法提高了解碼的效率,在160 Kb/s的接收速度下,讀取一張標簽的時間約為30次/s。 Abstract:  Aiming at the requirement of receiving correctly decoded data from the tag under high-speed communication which complied with EPC Gen2 standard in the design of UHF interrogator, the article introduced a new technology for FM0 decoding which counted the timer counter to judge data by using the edge interval of signal capture based on the ARM7 platform. Compared with the traditional FM0 decoding method which used the timer timed to sample the high and low level, the method could reduce the accumulation of timing error and could relatively separate capture timer interrupt and the data judgment for decoding, so that the disruption effect on the decoding was small and realizd synchronization of capture and decoding. Testing result shows that the method improves the efficiency of decoding, at 160 Kb/s receiving speed, the time of the interrogator to read a tag is about 30 times/s.

    標簽: UHF FM0 讀寫器 解碼技術

    上傳時間: 2013-11-10

    上傳用戶:liufei

  • 財務分析與決策

    財務分析與決策,全面認識公司財務狀況 會計是一門藝術(會計是一個職業判斷 professional judgment) (在會計準則的統計范圍之內做出合理的選擇和判斷,讓它能夠準確地描述一個企業)(Within the accounting standards, reasonable choices and judgments are used to accurately describe an enterprise) 會計是一門魔術(虧損一個億通過抵押 3 千萬的房子到 1.3 億將財務報表變為盈利 3 千萬) 

    標簽: 財務

    上傳時間: 2018-01-13

    上傳用戶:懶蟲羊羊

  • B型剩余電流保護器設計

    隨著光伏發電系統快速發展,以及電動汽車充電樁的普及,傳統的剩余電流保護器無法滿足實際需求。介紹了一款B型剩余電流保護器,采用磁調制剩余電流互感器和零序電流互感器采集剩余電流。根據GB/T 22794—2017標準要求,可識別1 kHz及以下的正弦交流、帶和不帶直流分量的脈動直流、平滑直流等剩余電流信號。經信號調理電路將電壓信號送到單片機進行采集和判斷。通過試驗測試,該樣機在測試精度和速度上均符合國家標準的相關要求。The rapid development of photovoltaic power generation systems and the popularity of electric vehicle charging piles make the traditional residual current protective devices unable to meet the actual demand.This paper proposed a type B residual current protective device,which uses the magnetically modulated residual current transformer and the zero sequence current transformer to acquire the residual current.According to the requirements of GB/T 22794—2017,the type B residual current protective device can detect sinusoidal AC residual current of 1kHz and below 1kHz,pulsating DC residual current with and without DC component,smooth DC residual current and so on.The signal processing circuit sends the voltage signal to the MCU for acquisition and judgment.Through experimental tests,the device meets the relevant requirements of national standards in terms of test accuracy and speed.

    標簽: 電流保護器

    上傳時間: 2022-03-27

    上傳用戶:

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