Turbulent drag reduction by additives has long been a hot research topic. This phenomenon is inherently associated with multifold expertise. Solutions of drag-reducing additives are usually viscoelastic fluids having complicated rheological properties. Exploring the characteristics of drag-reduced turbulent flows calls for uniquely designed experimental and numerical simulation techniques and elaborate theoretical considerations. Pertinently understanding the turbulent drag reduction mecha...

This book systematically reviews recent advances in the synthetic methods and applications of helicenes. The first part of this book introduces the nomenclature and structural features of helicenes. The second part reviews several classic and useful methods as well as recently-developed approaches for the preparation and functionalization of helicenes, including photocyclization and Diels-Alder reactions, which are two important breakthroughs in the syntheses of helicenes. In the last part...

Iptycenes Chemistry: From Synthesis to Applications provides a comprehensive overview of the development of iptycene chemistry in the past seventy years. This book covers: (1) the basic nomenclature and general properties of iptycenes and their derivatives; (2) the synthesis and functionalization reactions of triptycenes, pentiptycenes, higher iptycenes, heterotriptycenes, and homotriptycenes; (3) the methods for the preparation of iptycene-based polymers with different types; and (4) the ...

This book focuses on the fundamentals, technologies and properties of ion irradiation of dielectric materials (e.g. glasses, crystals) with regard to various photonic applications. It introduces readers to diverse ion-beam techniques for the fabrication and modification of micron- or nanoscale photonic structures, including optical waveguides, photonic crystals, and nanoparticle (nano-spheres and nano-rods) systems, and presents state-of-the-art advances in this multi-disciplinary research...

In this book, we collected recent results on the control of underactuated mechanical systems subject to internal uncertainties and external disturbances. The strategy developed is so universal that it is not restricted to a specific system but a large class of underactuated systems. Several benchmark systems are studied in this book, including detailed literature review, system dynamics derivation, control problem formulation, and simulation verification. The control strategy developed in ...

This book reviews the history and development of rhizobial ecology (diversity, function and interactions with the biotic and abiotic environments), evolution (genome diversification, systematics of symbiotic genes) and application. Further, it describes the new concept of rhizobia, the latest systematic methods, biogeographic study methods, and genomic studies to identify the interactions between rhizobia, legumes and environments. To enable readers to gain a comprehensive understanding of...

This book focuses on the applications of Equivalent-Small-Parameter Method (ESPM) in solving the steady-state periodic solutions, as well as stability analysis, of kinds of open-loop or closed-loop operated DC/DC converters, such as PWM, quasi-resonant and resonant ones. The analytical expressions of DC components and harmonics of state variables (inductor current and capacitor voltage) with DC/DC converters can be obtained by ESPM, which can be helpful to understand the nonlinear operatin...

If your home feels heavy, cluttered, or quietly draining your energy, The 7-Day Feng Shui Money Reset offers a gentle, grounded way to rebuild clarity—emotionally, financially, and energetically. This isn't superstition or complicated feng shui rules. It's a simple, human-centered system that transforms your space so it can finally support the life you want.Across seven intentional days, you'll learn how to clear stagnant energy, create a supportive wealth corner, design a...

Digital Chinese integrates situational and communicative methods to provide practical language skills and a deep understanding of the digital world.Digital Chinese is a pioneering textbook designed to meet the dual needs of Chinese language proficiency and digital literacy. Each of the ten chapters focuses on a specific theme, from social media and online shopping to AI chatbots, reflecting the most engaging aspects of contemporary Chinese digital life. Each lesso...

在天文观测中，有不少“引力异常现象”，是既有的引力理论所无法解释的。因此，研究各种空间粒子的运动对形成力的影响，具有举足轻重的意义。本人从客观实际出发，根据恒星的粒子辐射，推导出了恒星的三个斥力公式，并且撰写了恒星斥力的文章。力的存在一定会有施力者。我反复揣摩：靠质量本身就能形成引力，这从能量守恒定律的角度看，是说不通的。进一步的推论是，引力的施力者应该存在于质量之外。经过长期思考，我认为，相邻的两个物体之间，能出现“引力”，根据引力表现出的各种特征，比较像是宇宙空间环境中漫射的神秘莫测的强透射粒子捣鬼的结果。目前，我们虽然全面探测它们有困难，但也不能轻率地否认它们的存在和作用。中微子是强透射粒子的典型代表，尤其是 。 是隐形高手，身怀绝技，最有可能是引力的肇事者。宇宙中中微子的通量，目前我们无法确知。在没有找到更有说服力的引力理论之前，要认可宇宙大爆炸理论是完全正确的，也为时尚早。2013年3月，我对强透射粒子作用于两物体之间，建立分析模型，从构造方面重新推导了引力公式，当得到 这一形式后，并...

The rise of China's economy is an integral part of world history. Since 1978, China achieved tremendous economic success. What is the secret behind China's economic rise? This book approaches the topic by focusing on origins, models, and characteristics — a comprehensive perspective that offers further reflection on the often-discussed and ever-relevant subject of China's economic rise.The rise of China's economy keeps puzzling the intellectual minds. With clear and professional in...

引力无处不在，容易感知，但很不容易被检测。引力形成的原因到底是什么，至今仍是困扰着科学界的一大难题。万有引力理论和广义相对论，是引力理论的先驱。它们成就巨大，但也遗留下一些问题。力的存在一定会有施力者。作者反复揣摩：相邻的两个物体，靠质量自身就能形成引力，这从能量守恒定律的角度看，是说不通的。目前，也没有人能够从物质的内在构造中寻找到产生引力的机制。2012年，作者思考引力形成的原因，思路越来越清晰：引力的施力者，只能来自两物体之外。由引力具有极强穿透性和质量越大引力越强这两个特性推断：引力极有可能是由宇宙空间的强透射粒子漫射作用于两物体之间形成的。至于物体的质量，只是起到了一部分内在的作用。2013年3月，作者推导出了新引力公式的结构。这个新的引力公式具有牛顿引力公式F与Mm/（RR）成正相关的非凡身姿，但是，在G的宝座上有七个因子在各司其职。后来，作者把自己的收获写成了一篇论文《新引力公式的结构》，可能从此揭开了万有引力理论“系数G值”的神秘面纱。这篇文章是本书的核心内容之一。作者还指导学生，推导得到了“宇宙线引力...