Introduction With the growing global emphasis on green energy and sustainable development, hydropower has become an essential part of the global power system as a clean, renewable energy source. Hydropower systems are widely used around the world, and their high efficiency, reliability, and envir

Chapter 1: The History and Cultural Background of Signatures 1.1. The Origin and Development of Signatures The origin of the signature can be traced back to ancient civilizations. Initially, signatures were not the personal handwritten names we recognize today; they were symbols, seals, or mar

Introduction:   The sofa is not only an essential piece of furniture in our daily lives, but it also plays a crucial role in defining the style and atmosphere of our living spaces. As the central piece for family gatherings, entertainment, rest, and socializing, the sofa's design, col