Ultrasound medicine refers to a non-invasive examination that uses the characteristics of ultrasound and the different principles of human tissue reflection on ultrasound to form images to diagnose the morphological structure, physical characteristics, functional status and pathological status of human tissue.
     Ultrasound medical diagnosis is widely used in clinical applications, with simple operation, convenient use, cost-effective, high accuracy, good localization, and high diagnosis rate of patients’ complications. Therefore, its clinical application is more extensive, providing the valuable reference information, and it can make a treatment plan in time and improve the success rate of first aid, especially in the diagnosis of some abdominal trauma and acute abdomen.It has a great effect on the development of the emergency medical system, which is recommended to provide this kind of diagnostic method for emergency patients in the clinic to improve the diagnosis accuracy of patients and improve treatment effect.
      Combined with the current social development status, this book introduces the related theories and knowledge of ultrasound medicine in many aspects, focusing on the current imaging research. The contents of the book are comprehensive, systematic and practical. It is s also suitable for teachers and students of medical imaging major in colleges and universities, and engineering and technical personnel engaged in ultrasound instrument sales, application training and hospital equipment management to learn and refer to.

前 言

超声医学是指应用超声波的特性和人体组织对超声反射不同的原理形成图像，来诊断人体组织的形态结构、物理特征和功能状态及病理状态的一种非创伤性检查。
  超声医学诊断临床应用广泛，其操作简单，使用便捷，性价比高，准确率高，定位性好，对患者的并发症也有较高的诊出率， 因此临床应用比较广泛，为临床诊断提供了有价值的参考信息，可以及时的制定治疗方案， 提高急救成功率。尤其是在一些腹部创伤和急腹症的诊断中效果突出，对于急救医疗体系的发展提供了较大的帮助，建议在临床中为急诊患者提供该种诊断方式， 提升患者的诊断准确率， 提升治疗效果。
  本书结合当前社会发展现状，从多个方面详细介绍了超声医学相关理论与知识，其中重点包含目前影像研究相关内容等。书中内容全面、系统、实用，亦适合大专院校医学影专业的师生，从事超声仪器销售、应用培训及医院设备管理的工程技术人员学习、参考。

In the 21st century, the world’s construction market is mainly in China, which is attracting worldwide attention. For this reason, many people of insight are optimistic about this opportunity, actively cultivate construction technology talents, and learn architectural design and construction technology.
    With the development of society, the construction industry and construction technology are developing rapidly, and the degree of building electrification and automation is getting higher and higher. The state has formulated and revised a number of new design standards and electrical construction specifications. Domestic and foreign new
electrical technology and new products and equipment are constantly used in practical projects, so it is urgent to have a comprehensive introduction to the design of building power supply, construction and installation, quality management, teaching reference and other aspects of the book.
    In order to meet the needs of the majority of construction engineering technical design and construction personnel, as well as the needs of the in-service construction engineering design, teaching and construction personnel, the author has compiled the comprehensive reference book, Research on electrical energy saving of building engineering. This book adopts the latest electrical graphic symbols and text marking specifications consistent with IEC (International Electrotechnical Commission), so as to connect with international standards.
  This book can be used as a comprehensive reference book for courses such as “building power supply design”, “building electrical construction” and “electrical engineering quality management”.
    This book is characterized by concise writing, illustrations and texts, and combination of theory and practice. So it is also suitable for self-study.

前 言

 在 21 世纪，全世界的建筑市场主要在我国，这是举世瞩目的。为此，许多有识之士看好这一机遇，积极培养建筑技术人才，学习建筑设计与施工技术。
    随着社会的进步，建筑工业和建筑技术正在迅速发展，建筑电气化、自动化程度越来越高，国家制定和修订了一批新的设计标准和电气施工规范。国内外的建筑电气新技术新产品和设备不断地应用于实际工程之中，因此迫切需要一本全面介绍建筑供电设计、施工安装、质量管理以及教学参考等方面的书籍。
    为了满足广大建筑工程技术设计和施工人员的需要及在职建筑工程设计、教学、施工人员的需要，作者编写了《建筑工程电气节能研究》这本综合性参考书。本书采用了与 IEC（国际电工委员会）一致的最新的电气图形符号及文字标注规范，以便和国际标准接轨。
   本书可以作为“建筑供电设计”“建筑电气施工”及“电气工程质量管理”等课程的综合参考书。也可以作为在岗的工程技术人员的工具书使用。
   本书的特点是文字简炼、图文并茂、深入浅出、理论联系实际。所以也适合于自学参阅。

Water resources development is an important project of economic construction and people’s livelihood improvement in China. In recent years, the development and utilization of water resources in China have caused damage to the natural environment in some areas. At present, these problems have attracted the attention of the environmental protection department in China, and the environmental protection in the process of water resources development has  been taken as the focus of environmental protection work.
    This book is divided into water resources development, hydrology and water resources survey technology, water conservancy project construction, hydropower project construction, environmental ethics and law of hydropower resources development, environmental problems of water resources development and utilization, water environment protection and water ecological comprehensive treatment. It expounds the environmental problems brought by water resources development, engineering construction and water resources development and their treatment and protection in several aspects. It fully embodies the guiding ideology of harmonious development of water resources development and construction and environmental protection in the future, in order to contribute to China’s water resources development and construction, and provide a practical reference book for the staff engaged in water conservancy, hydropower and energy related work.
     As this book covers a lot of contents and involves a lot of knowledge, the format, depth and breadth of the contents of each chapter may not be the same, and fallacies are inevitable. Please comment and correct.

前 言

水资源开发是我国经济建设和民生改善的重要工程，近些年来，我国水资源的开发利用对一些地区的自然环境造成了破坏，这些问题目前已经引起我国环境保护部门的重视，并且将水资源开发过程中的环境保护作为环保工作的重点。
  本书分为水资源开发、水文水资源勘测技术、水利工程建设、水电工程施工、水电资源开发的环境伦理与法律、水资源开发利用环境问题、水环境保护以及水生态综合治理，几个方面阐述了水资源开发及其工程施工建设和水资源开发所带来的环境问题及其治理保护两个方面的内容，充分体现了未来水资源开发建设与环境保护和谐发展的指导思想，以期为我国水资源开发建设事业添砖加瓦，为从事水利水电与能源相关工作的工作人员提供一本切合实用的参考书。
  由于本书包罗内容较多，涉及知识较烦琐，各章节内容的格式、深度和广度可能并不一致，且谬误无可避免，敬请广大读者批评指正。

The book is rich in content, including project management, hydrology, engineering geology, engineering tasks and scale, water conservation, the protection of water resource , the impact and assessment of the environment, etc. This book is a general reference material for all related disciplines of water conservancy and hydropower, water administration and water resource management, environmental water conservancy and water resource protection, as well as for engineering technicians engaged in water conservancy and hydropower project planning, feasibility study, preliminary design and water administration and water resource management.
    Our intention of compiling Water Conservancy and Hydropower Engineering Construction and Water Resource Protection is to provide a practical textbook and reference book for water conservancy workers. However, due to the complexity of knowledge involved in this book, the format, depth and breadth of the contents of each chapter may not be the same, and fallacies are inevitable. Readers are welcome to criticize and correct them.

前 言

本书主要内容丰富，包括项目管理、水文、工程地质、工程任务与规模、水体保持、水资源保护、环境影响评价等。本书是相关水利水电类各专业及水政水资源管理专业、环境水利与水资源保护类的通用参考资料，也可供从事水利水电工程规划、可行性研究、初步设计及水政水资源管理等方面工作的工程技术人员参考。
  我们编写《水利水电工程施工与水资源保护》的意图，是为水利工作者提供一本贴合实用的教材与参考书。然而，由于本书涉及知识较繁杂，各章节内容的格式、深度和广度可能并不一致，谬误无可避免，敬请读者批评指正。

According to the actual situation of the long-term development of water conservancy and hydropower in China, there are deficiencies, which not only affect the economic benefits of the construction of water conservancy and hydropower projects, but also bring many hidden dangers to the economic production and people’s life. Water conservancy and hydropower have always been an important part of the development of national economy in China. Therefore, we should strengthen the management and quality control of water conservancy and hydropower projects, and actively take scientific measures to promote the management of water conservancy and hydropower projects in the new era. This is the development direction of water conservancy and hydropower in China. 

The construction quality and safety management of hydropower projects will directly affect the quality of water conservancy and hydropower projects. But in the actual construction, because of the construction management personnel and management system is not perfect, it will seriously affect the construction safety of water conservancy and hydropower. This paper discusses the safety management and control of water conservancy and hydropower engineering construction, so as to improve its management quality and ensure the construction quality level.
     There are many complex problems in the construction of water conservancy project, and the safety production is of great importance. In order to ensure the safety production, we must consider many factors comprehensively, take corresponding safety management measures, and improve the level of safety production.
    Water conservancy and hydropower engineering construction is an important part of social development, which plays an important role in economic and social development. Therefore, it is necessary to strengthen the construction technology of water conservancy and hydropower engineering.
    With the gradual improvement of the market economy system and the deepening of the reform of state-owned enterprises, strengthening enterprise management and improving the level of scientific management is one of the important ways for water conservancy and hydropower construction enterprises to transform their operation mechanism and achieve the goal of turning losses into profits. Water conservancy and hydropower are the basic industries for the development of national economy and society.
The construction projects of water conservancy and hydropower projects are the basic points and main benefits for the operation and management of water conservancy and hydropower construction enterprises. Strengthening project management is one of the key factors to improve management level, economic benefits and sustainable and stable development of water conservancy and hydropower construction enterprises.

前 言

就我国水利水电长期发展的实际情况来看存在着不足，不仅影响着水利水电工程建设的经济效益，而且还给经济生产、民众生活带来诸多安全隐患，水利水电事业一直以来都是我国国民经济发展的重要部分，因此加大对水利水电工程管理和质量控制，积极采取科学发展策略来促进新时期的水利水电工程管理，这是我国水利水电事业必须要重视的发展方向。
  水电工程施工质量安全管理将会直接影响到水利水电工程的质量。但是在实际的施工中，由于施工管理人员和管理制度不健全，最终会严重影响到水利水电的施工安全性。通过对水利水电工程施工安全管理与控制进行相应的探讨，从而提升其管理质量，保证施工质量水平。
  水利工程施工中面临很多复杂的问题，其安全生产事关重大，为了确保其安全生产，必须要综合考虑多方面的因素，采取相应的安全管理措施，提高安全生产水平。
  水利水电工程建设是社会发展的一个重要部分，对经济和社会的发展有着很重要的作用，因此，要加强水利水电工程施工技术。
  随着市场经济体制的逐步完善和国企改革的深入，强化企业管理，提高科学管理水平是水利水电施工企业转换经营机制、实现扭亏增盈的重要途径之一，水利水电是国民经济和社会发展的基础产业，水电工程施工项目是水利水电施工企业经营管理的基点、效益的主体、信誉的窗口，加强项目管理是水利水电施工企业提高管理水平、经济效益和持续稳定发展的关键因素之一。