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ruby on rails tutorials 中文版 第二版 高清版 带书签 pdf 《Ruby on Rails Tutorial》中文版（原书第2版，涵盖 Rails 4） Ruby 是一门很美的计算机语言，其设计原则就是“让编程人员快乐”。David Heinemeier Hansson 就是看重了这一点，才在开发 Rails 框架时选择了 Ruby。Rails 常被称作 Ruby on Rails，它让 Web 开发变得从未这么快速，也从未如此简单。在过去的几年中，《Ruby on Rails Tutorial》这本书被视为介绍使用 Rails 进行 Web 开发的先驱者。 在这个全球互联的世界中，计算机编程和 Web 应用程序开发都在迅猛发展，我很期待能为中国的开发者提供 Ruby on Rails 培训。学习英语这门世界语言是很重要的，但先通过母语学习往往会更有效果。正因为这样，当看到 Andor Chen 把《Ruby on Rails Tutorial》翻译成中文时，我很高兴。 我从未到过中国，但一定会在未来的某一天造访。希望我到中国时能见到本书的一些读者！ 衷心的祝福你们， 《Ruby on Rails Tutorial》作者 Michael Hartl 原文： Ruby is a delightful computer language explicitly designed to make programmers happy. This philosophy influenced David Heinemeier Hansson to pick Ruby when implementing the Rails web framework. Ruby on Rails, as it’s often called, makes building custom web applications faster and easier than ever before. In the past few years, the Ruby on Rails Tutorial has become the leading introduction to web development with Rails. In our interconnected world, computer programming and web application development are rapidly rising in importance, and I am excited to support Ruby on Rails in China. Although it is important to learn English, which is the international language of programming, it’s often helpful at first to learn in your native language. It is for this reason that I am grateful to Andor Chen for producing the Chinese-language edition of the Ruby on Rails Tutorial book. I’ve never been to China, but I definitely plan to visit some day. I hope I’ll have the chance to meet some of you when I do! Best wishes and good luck, Michael Hartl Author The Ruby on Rails Tutorial

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OpenMP是由The Board of the OpenMP Architecture Review Board（ARB）提出的一套用于共享内存并行系统的多线程程序设计标准。目前，OpenMP仅支持C、C++和Fortran语言。由于OpenMP是一种共享存储的标准，所以在非共享存储系统上不能使用，如集群（Cluster）（目前在非共享存储系统上并行主要采用MPI）。简而言之，OpenMP就是一种多线程程序设计的标准，适合在个人计算机上进行并行计算。它提供了对并行算法的抽象描述，程序员只需在源代码中加入专用的pragma来指明，编译器将自动将程序进行并行。

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David.M.Pozar 的《微波工程》第四版英文版 This page is intentionally left blank Microwave Engineering This page is intentionally left blank Microwave Engineering Fourth Edition David M. Pozar University of Massachusetts at Amherst John Wiley & Sons, Inc. Vice President & Executive Publisher Don Fowley Associate Publisher Dan Sayre Content Manager Lucille Buonocore Senior Production Editor Anna Melhorn Marketing Manager Christopher Ruel Creative Director Harry Nolan Senior Designer Jim O’Shea Production Management Services Sherrill Redd of Aptara Editorial Assistant Charlotte Cerf Lead Product Designer Tom Kulesa Cover Designer Jim O’Shea R This book was set in Times Roman 10/12 by Aptara, Inc. and printed and bound by Hamilton Printing. The cover was printed by Hamilton Printing. Copyright C 2012, 2005, 1998 by John Wiley & Sons, Inc. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning or otherwise, except as permitted under Sections 107 or 108 of the 1976 United States Copyright Act, without either the prior written permission of the Publisher, or authorization through payment of the appropriate per-copy fee to the Copyright Clearance Center, Inc. 222 Rosewood Drive, Danvers, MA 01923, website www.copyright.com. Requests to the Publisher for permission should be addressed to the Permissions Department, John Wiley & Sons, Inc., 111 River Street, Hoboken, NJ 07030-5774, (201)748-6011, fax (201)748-6008, website http://www.wiley.com/go/permissions. Founded in 1807,