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Programming the Semantic Web by Toby Segaran, Colin Evans, and Jamie Taylor Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472. Editor: Mary E. Treseler Production Editor: Sarah Schneider Copyeditor: Emily Quill Proofreader: Sarah Schneider Indexer: Seth Maislin Cover Designer: Karen Montgomery Interior Designer: David Futato Illustrator: Robert Romano Printing History: July 2009: First Edition. ISBN: 978-0-596-15381-6 [M] 1246569738 -------------------------------------------- Some years back, Tim Berners-Lee opined that we would know that the semantic web was becoming a success when people stopped asking “why?” and started asking “how?”—the same way they did with the World Wide Web many years earlier. With this book, I finally feel comfortable saying we have turned that corner. This book is about the “how”—it provides the tools a programmer needs to get going now!

Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472. Author: David Sklar & Adam Trachtenberg Save precious web development time using PHP Cookbook, Second Edition. With solutions to real-world problems at your fingertips, information is instantly available for a multitude of coding challenges. Editor: Tatiana Apandi Production Editor: Adam Witwer Copyeditor: Adam Witwer Proofreader: Sada Preisch Indexer: Joe Wizda Cover Designer: Karen Montgomery Interior Designer: David Futato Illustrators: Robert Romano and Jessamyn Read Printing History: November 2002: First Edition. August 2006: Second Edition.

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Greetings, and welcome to Unix and Linux! In this book, you’ll find the information you need to get started with the operating system, advance your skills, and make Linux or Unix do the hard work for you. This book focuses on the most common Unix and Linux commands, but it also gives you ideas for working smartly and efficiently. For the purposes of this book, Unix and Linux are pretty much interchangeable—the commands and usages are the same. You may find small differences among Unix versions or between specific Unix or Linux versions, but they’ll be small indeed.

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从简单的计算机操作到大规模的编程和互动式的文件准备，Mathematica 是科学研究前沿、工程分析和建模、从中学到研究生的技术教育、以及只要数量方法涉及之处必备的工具。 　　Mathematica是由美国物理学家Stephen Wolfram领导的Wolfram Research开发的数学系统软件。它拥有强大的数值计算和符号计算能力，在这一方面与Maple类似，但它的符号计算不是基于Maple上的，而是自己开发的。 它的主要使用者是从事理论研究的数学工作者和其它科学工作者、以及从事实际工作的工程技术人员。Mathematica可以用于解决各种领域的涉及复杂的符号计算和数值计算的问题。它代替了许多以前仅仅只能靠纸和笔解决的工作，这种思维和解题工具的革新可能对各种研究领域和工程领域产生深远的影响。 Mathematica可以做许多符号演算工作：它能进行多项式的计算、因式分解、展开等。进行各种有理式计算，求多项式、有理式方程和超越方程的精确解和近似解。进行数值的或一般代数式的向量、矩阵的各种计算。求极限、导数、积分，幂级数展开，求解某些微分方程等。 Mathematica还可以做任意位数的整数或分子分母为任意大整数的有理数的精确计算，做具有任意位精度的数值(实、复数值)的计算。所有Mathematica系统内部定义的整函数、实(复)函数也具有这样的性质。使用Mathematica可以很方便地画出用各种方式表示的一元和二元函数的图形。通过这样的图形，我们可以立即形象地把握住函数的某些特性，而这些特征一般很难从函数的符号表达式中看清楚。 Mathematica的能力不仅仅在于上面说的这些功能，更重要的在于它把这些功能有机地结合在一个系统里。在使用这个系统时，人们可以根据自己的需要，一会儿从符号演算转去画图形，一会又转去做数值计算。这种灵活性能带来极大的方便，常使一些看起来非常复杂的问题变的易如反掌。在学习和使用Mathematica的过程中读者会逐步体会这些。Mathematica还是一个很容易扩充和修改的系统，它提供了一套描述方法，相当于一个编程语言，用这个语言可以写程序，解决各种特殊问题。