Py3爬取B站視頻彈幕。。。。。。。。。。。。。
上傳時間: 2019-12-17
上傳用戶:wine
1998年建模B題,內(nèi)含解題方法解題步驟。
標簽: 1998 數(shù)學(xué)建模 論文
上傳時間: 2020-05-02
上傳用戶:isomerrrr
This book is an entry-level text on the technology of telecommunications. It has been crafted with the newcomer in mind. The eighteen chapters of text have been prepared for high-school graduates who understand algebra, logarithms, and basic electrical prin- ciples such as Ohm’s law. However, many users require support in these areas so Appen- dices A and B review the essentials of electricity and mathematics through logarithms.
標簽: Telecommunications Fundamentals 1st of ed
上傳時間: 2020-05-27
上傳用戶:shancjb
This book is an entry-level text on the technology of telecommunications. It has been crafted with the newcomer in mind. The twenty-one chapters of text have been prepared for high-school graduates who understand algebra, logarithms, and the basic principles of electricity such as Ohm’s law. However, it is appreciated that many readers require support in these areas. Appendices A and B review the essentials of electricity and mathematics up through logarithms. This material was placed in the appendices so as not to distract from the main theme, the technology of telecommunication systems. Another topic that many in the industry find difficult is the use of decibels and derived units. Appendix C provides the reader a basic understanding of decibels and their applications. The only mathematics necessary is an understanding of the powers of ten
標簽: Telecommunications Fundamentals 2nd of ed
上傳時間: 2020-05-27
上傳用戶:shancjb
全國大學(xué)生電子設(shè)計競賽2020年TI杯模擬電子系統(tǒng)設(shè)計專題邀請賽多種幅度調(diào)制信號發(fā)生電路(B 題)
標簽: 幅度調(diào)制 信號發(fā)生電路
上傳時間: 2021-07-08
上傳用戶:st-15180703380
NS32F103x8(B) 軟件硬件兼容STM32F103C8/CBT6,實際測試過,完全可以兼容。支持國產(chǎn),國產(chǎn)加油!
標簽: ns32f103x8 STM32
上傳時間: 2021-10-31
上傳用戶:
5V USB扁口接口TP4055鋰離子電池充電接口板ALTIUM設(shè)計硬件原理圖+PCB文件,2層B板手設(shè)計,大小為33*18mm,,可以做為你的學(xué)習(xí)設(shè)計參考。TP4055 是一款完整的單節(jié)鋰離子電池充電器,帶電池正負極反接保護,采用恒定 電流/恒定電壓線性控制。其 SOT 封裝與較少的外部元件數(shù)目使得 TP4055 成為便攜式應(yīng) 用的理想選擇。TP4055 可以適合 USB 電源和適配器電源工作。 由于采用了內(nèi)部 PMOSFET 架構(gòu),加上防倒充電路,所以不需要外部檢測電阻器和 隔離二極管。熱反饋可對充電電流進行自動調(diào)節(jié),以便在大功率操作或高環(huán)境溫度條件 下對芯片溫度加以限制。充滿電壓固定于 4.2V,而充電電流可通過一個電阻器進行外部 設(shè)置。當(dāng)電池達到 4.2V 之后,充電電流降至設(shè)定值 1/10,TP4055 將自動終止充電。 當(dāng)輸入電壓(交流適配器或 USB 電源)被拿掉時,TP4055 自動進入一個低電流狀 態(tài),電池漏電流在 2uA 以下。TP4055 的其他特點包括充電電流監(jiān)控器、欠壓閉鎖、自 動再充電和一個用于指示充電結(jié)束和輸入電壓接入的狀態(tài)引腳。
上傳時間: 2021-11-22
上傳用戶:trh505
該文檔為A、B、AB、D類音頻功率放大器簡介文檔,是一份很不錯的參考資料,具有較高參考價值,感興趣的可以下載看看………………
上傳時間: 2021-11-28
上傳用戶:qdxqdxqdxqdx
基于ARM-FPGA的IRIG-B碼產(chǎn)生器的研制這是一份非常不錯的資料,歡迎下載,希望對您有幫助!
上傳時間: 2021-12-30
上傳用戶:
隨著光伏發(fā)電系統(tǒng)快速發(fā)展,以及電動汽車充電樁的普及,傳統(tǒng)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(diào)制剩余電流互感器和零序電流互感器采集剩余電流。根據(jù)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(jīng)信號調(diào)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(guān)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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