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电子密码锁是现代电子科技与安全结合的产物。它在现代锁业扮演着重要的角色，本文的主要内容是用AT89c52单片机为核心控制元件，用存储器24c04进行存储密码锁的密码，当用户输入的密码与存储器储存的密码相同时，即可开锁成功，并也可以修改密码，若不相同，则不能开锁，并提示密码错误。

Lumped Elements for RF and Microwave Circuits英文版，射频微波电路入门Lumped Elements for RFand microwave circuitsFor a listing of recent titles in the Artech House Microwave library,turn to the back of this bookLumped Elements for RFand microwave circuitsInder bahlArtech houseBoston londonwww.artechhouse.comLibrary of Congress Cataloging-in-Publication DataBahl, I.J.Lumped elements for RF and microwave circuits /Inder Bahlp cm.--(Artech House microwave libraryncludes bibliographical references and indexISBN 1-58053-309-4(alk. paper1. Lumped elements(Electronics) 2. Microwave integrated circuits. 3. Radiofrequency integrated circuits. 4. Passive components. I. Title. II. SeriesTK7874.54B342003621.38132-dc212003048102British Library Cataloguing in Publication DataBahl, I. J. Inder jit)Lumped elements for RF and microwave circuits.-(Artech House microwave library1. Radio circuits 2. Microwave circuits I. Title621.38412ISBN1-58053-3094Cover design by Igor Valdmar2003 ARTECH HOUSE, INC.685 Canton StreetNorwood Ma 02062All rights reserved Printed and bound in the United States of America. no part of this bookmay be reproduced or utilized in any form or by any means, electronic or mechanical, includingphotocopying, recording, or by any information storage and retrieval system, without permissionn writing from the publisherall terms mentioned in this book that are known to be trademarks or service marks have beenappropriately capitalized. Artech House cannot attest to the accuracy of this information. Useof a term in this book should not be regarded as affecting the validity of any trademark or servicemarkInternational Standard Book Number: 1-58053-309-4Library of Congress Catalog Card Number: 200304810210987654321To my adorable grandsons, Karan and Rohan Kaushal, with whom I play, cry,and laugh, and who have provided me with the idea and inspiration towrite this bookContentsPrefaceXVAcknowledgmentsXXIntroduction1.1 History of Lumped Elcements)Why Use Lumped Elements for rF andMicrowave circuits1.3 L, C, R Circuit Elements1.4 Basic Design of Lumped Elements4.1 Capacitor1.4.2 Inductor4.3 Resistorumped-Element Modelin1. 6 Fabrication1.7 ApplicationsReferencesInductors2.1 IntroductionLumped Elements for RF and Microwave Circuits2.2 Basic Definitions2.2.1 Inductance2.2.2 Magnetic Energy182.2.3 Mutual Inductance202. 2. 4 Effective Inductance202.2.5Imedang2.2.6 Time Constant2.2.7 Quality Factor222.2.8 Self-Resonant Frequency232.2.9aximum Current Ratin2.2.10 Maximum Power Rating2.2.11 Other Parameters232.3 Inductor Configurations242.4 Inductor models2. 4. 1 Analytical Models252.4.2 Coupled-Line Appiroach282.4.3 Mutual Induse arppi342.4.4 Numerical Approach362.4.5 Measurement-Based model382.5 Coupling Between Inductors452.5. 1 Low-Resistivity Substrates2.5.2 High-Resistivity Substrates462.6 Electrical Representations2.6. 1 Series and Parallel representations2.6.2 Network Representations51References52Printed Inductors573.1 Inductors on Si Substrate583.1.1 Conductor Loss3.1.2 Substrate Loss3. 1.3 Layout Considerations3.1.4 Inductor Model3. 1.5 Q-Enhancement Techniques3.1.6 Stacked-Coil Inductor803.1.7 Temperature Dependence84

【实例简介】可以有效完成两个excel数据核对，通过有效选择内容，实现自动对账。是财务、审计、资金等行业工作人员的好帮手。

利用matlab处理对两幅图像的叠加处理 其中一幅作为前景需要提取主干信息，另一幅则作为背景图将第一幅中提取出的主干信息叠加到第二幅图像中三个色面的单独处理

非局部均值图像去噪算法的matlab实现的讨论，包括算法实现过程的转换以及matlab实现的流程图。最后则是对仿真结果的分析，分别从两个角度进行了比较：同一图像在不同噪声下的PSNR（峰值信噪比），以及在同一噪声下不同的图像下的PSNR比较，从而判断非局部均值图像去噪算法的去噪效果。

需要的可以下载，本人自己编写的，支持显示和序列号、时间、日期等功能的标刻，并且可以实现打标的同时进行识别二维码，检查二维码是否正确，本程序一共分为三那部分

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包含热电偶 pid 的控制程序 原理图，可以直接用于工业产品。源码是直接产品在用的，质量方面仁者见仁智者见智。

利用曲率尺度空间(CSS)算法检测角点，matlab实现，含GUI界面