Bøger af Yumin Zhang

Microelectronics is a challenging course to many undergraduate students and is often described as very messy. Before taking this course, all the students have learned circuit analysis, where basically all the problems can be solved by applying Kirchhoff's

Engineering Thermodynamics is a core course for students majoring in Mechanical and Aerospace Engineering. Before taking this course, students usually have learned \textit{Engineering Mechanics}-Statics and Dynamics, and they are used to solving problems with calculus and differential equations. Unfortunately, these approaches do not apply for Thermodynamics. Instead, they have to rely on many data tables and graphs to solve problems. In addition, many concepts are hard to understand, such as entropy. Therefore, most students feel very frustrated while taking this course.The key concept in Engineering Thermodynamics is state-properties: If one knows two properties, the state can be determined, as well as the other four properties. Unlike most textbooks, the first two chapters of this book introduce thermodynamic properties and laws with the ideal gas model, where equations can be engaged. In this way, students can employ their familiar approaches, and thus can understand them much better. In order to help students understand entropy in depth, interpretation with statistical physics is introduced. Chapters 3 and 4 discuss control-mass and control-volume processes with general fluids, where the data tables are used to solve problems. Chapter 5 covers a few advanced topics, which can also help students understand the concepts in thermodynamics from a broader perspective.

Microelectronics is a challenging course to many undergraduate students and is often described as very messy. This book tries to illustrate the major ideas and the basic analysis techniques, so that students can derive the right equations easily when facing an electronic circuit.

Chinese is rapidly becoming one of the most popular foreign languages taught in many countries all over the world; however, it is also one of the most challenging to learn. The standard method of teaching Chinese is often adopted from elementary schools in China, where students learn the language through repetition and practice. Unfortunately, this approach is not very effective for teenagers and adults living in other countries, as Chinese children are already familiar with the spoken language before entering elementary school. In addition, learning through rote memorization is not a good approach for teenagers and adults, who have stronger analytical abilities than young children. It is clear that more effective ways of learning Chinese are needed. Western languages are composed of letters with specific pronunciations. In this sense, we can call them audio languages. In contrast, Chinese is a visual language, originating from the images of objects. Therefore, reading is easier than speaking in learning Chinese. If total immersion in the language environment is not an option, studying Chinese characters first is recommended as this can form the foundation for reading and speaking Chinese later on. At first glance, Chinese characters are like randomly scattered beads, and beginners often feel that it is almost impossible to grasp this mysterious language. But if examined closely, the Chinese language is actually similar to a piece of tightly-knit silk woven from basic radicals. If Chinese characters are considered as the chemical compounds, the radicals are the elements in the periodic table. With two hundred radicals, thousands of characters can be constructed. In addition, the weaving process involves wisdom, philosophy, science, and even ancient legends. To introduce the intricate fabric of Chinese to its readers, this book follows the structure of a tree: each chapter is like a large branch, the sections within a chapter are like smaller branches, and each individual character is like a twig growing out from the branch. This is the first book teaching Chinese with the radicals in a systematic way, which is proved much more interesting and efficient. This book is divided into three units: the first unit covers thirty radicals, and each of them includes five characters. This unit serves as an introduction to beginners and also builds some basic vocabulary for the later chapters. The second and third units cover natural environment and human society, respectively. These two units are suitable for intermediate Chinese learners, as they go more in depth to explore the connected network of characters. This book has detailed explanations of around 650 characters, and introduces around 1,400 closely related characters as well as lists more than 1,000 characters belonging to these categories. Therefore, this book exposes readers to approximately 3,000 commonly used Chinese characters in a well-organized way, and with this vocabulary one can start advanced learning by reading Chinese essays and stories.