《朗文当代高级英语词典》（Longman Contemporary English Dictionary）第三版是一款专为Mac用户设计的电子词典资源，提供了丰富的英语学习和查询功能。这款词典在Mac平台上为用户提供了便捷、全面的英语词汇解释，是提高英语水平、理解和运用现代英语的重要工具。 作为一款专业的英语学习软件，它涵盖了广泛的词汇量，包括了日常生活、学术研究以及专业领域的词汇，尤其注重对当代英语的更新和变化。词典中的释义清晰易懂，适合各个级别的英语学习者使用。同时，它还包含了丰富的例句、短语和搭配，帮助用户更好地掌握词汇的实际用法。 在Mac上使用LM3.dictionary文件，用户可以享受以下功能： 1. 快速查找：只需输入单词，即可迅速得到详细的释义、发音、同义词、反义词等信息。 2. 实用例句：每个单词都配以生动的例句，展示其在不同语境中的应用。 3. 语音支持：内置发音功能，帮助用户纠正发音，提升听力理解能力。 4. 学习工具：提供单词记忆、学习计划等功能，帮助用户系统地进行英语学习。 5. 更新与升级：定期更新词汇库，保持与时代同步，确保用户获取最准确的英语信息。 在Mac操作系统中，通常可以通过安装特定的字典应用程序或者将LM3.dictionary文件导入到系统字典库中来使用。这样，在任何需要查词的场合，只需选中单词，右键点击并选择“定义”选项，就可以快速查阅到《朗文当代高级英语词典》的解释。 《朗文当代高级英语词典》第三版对于Mac用户来说，不仅是一款日常学习的得力助手，也是提高英语综合能力的重要资源。通过深入使用LM3.dictionary文件，用户可以更加高效地学习和掌握现代英语，提升自身的语言素养。

《雷达系统分析与设计使用MATLAB 3rd Edition》是一本深入探讨雷达系统设计与分析的专业书籍，其配套代码提供了实践操作的平台，使理论知识得以直观化和具体化。MATLAB作为强大的数学计算和仿真工具，对于理解和实现雷达系统的各种算法至关重要。 雷达系统的基础在于信号处理，包括信号的生成、发射、接收以及信号处理。MATLAB代码可能涵盖了脉冲压缩、匹配滤波、多普勒处理等关键技术。脉冲压缩技术通过线性调频信号生成宽脉冲，提高距离分辨率；匹配滤波则利用已知信号形状最大化信噪比，提高目标检测性能；多普勒处理则用于分析目标的相对运动，提供速度信息。 雷达目标探测和识别是另一个重点。在MATLAB代码中，可能包含自适应阈值检测、恒虚警率(CFAR)检测等算法。自适应阈值检测根据背景噪声动态设定检测阈值，避免假警报；CFAR技术则确保在不同背景噪声下保持恒定的虚警概率，提高目标检测的可靠性。 再者，雷达系统设计还涉及目标参数估计，如距离、角度和速度的估计。MATLAB代码可能涉及到最小二乘法、最大似然估计等方法，这些方法用于从接收到的回波信号中提取目标参数，提高估计精度。 此外，波形设计也是雷达系统的重要部分。例如，线性调频连续波(LFM)、频率捷变(FM)等雷达波形可能在代码中有所体现，这些波形具有优良的特性，如距离分辨率高、多普勒处理能力强等。 MATLAB代码可能还包括了雷达信号的仿真，模拟真实雷达系统的工作流程，包括发射信号的建模、传播环境的模拟、接收信号的处理等。这有助于读者理解雷达系统在不同条件下的表现，并为优化系统设计提供依据。 在学习这本书时，配合MATLAB代码进行实践，不仅可以加深对理论的理解，还能提高解决实际问题的能力。通过调试代码，可以直观地看到算法的运行效果，这对于理论学习和工程应用都是非常有价值的。因此，这本书的配套代码无疑是学习雷达系统分析与设计的宝贵资源。

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Summary The Well-Grounded Rubyist, Third Edition is a beautifully written tutorial that begins with your first Ruby program and takes you all the way to sophisticated topics like reflection, threading, and recursion. Ruby masters David A. Black and Joe Leo distill their years of knowledge for you, concentrating on the language and its uses so you can use Ruby in any way you choose. Updated for Ruby 2.5. Purchase of the print book includes a free eBook in PDF, Kindle, and ePub formats from Manning Publications. About the Technology Designed for developer productivity, Ruby is an easy-to-learn dynamic language perfect for creating virtually any kind of software. Its famously friendly development community, countless libraries, and amazing tools, like the Rails framework, have established it as the language of choice for high-profile companies, including GitHub, SlideShare, and Shopify. The future is bright for the well-grounded Rubyist! About the Book In The Well-Grounded Rubyist, Third Edition, expert authors David A. Black and Joseph Leo III deliver Ruby mastery in an easy-to-read, casual style. You'll lock in core principles as you write your first Ruby programs. Then, you'll progressively build up to topics like reflection, threading, and recursion, cementing your knowledge with high-value exercises to practice your skills along the way. What's Inside Basic Ruby syntax Running Ruby extensions FP concepts like currying, side-effect-free code, and recursion Ruby 2.5 updates About the Reader For readers with beginner-level programming skills, as well as more advanced programmers interested in Ruby and experienced Rubyists looking to review the foundations of their practice. About the Authors David A. Black is an internationally known Ruby developer and author, and a cofounder of Ruby Central. Ruby teacher and advocate Joseph Leo III is the founder of Def Method and lead organizer of the Gotham Ruby Conference. Table of Contents PART 1 RUBY FOUNDATIONS Chapter 1. Bootstrapping your Ruby literacy Chapter 2. Objects, methods, and local variables Chapter 3. Organizing objects with classes Chapter 4. Modules and program organization Chapter 5. The default object (self), scope, and visibility Chapter 6. Control-flow techniques PART 2 BUILT-IN CLASSES AND MODULES Chapter 1. Built-in essentials Chapter 2. Strings, symbols, and other scalar objects Chapter 3. Collection and container objects Chapter 4. Collections central: Enumerable and Enumerator Chapter 5. Regular expressions and regexp-based string operations Chapter 6. File and I/O operations PART 3 RUBY DYNAMICS Chapter 1. Object individuation Chapter 2. Callable and runnable objects Chapter 3. Callbacks, hooks, and runtime introspection Chapter 4. Ruby and functional programming