The rapid urbanization and industrialization involve an unsustainable use of natural systems,leading to various problems in cities.The urban hydrological system
To realize equal power splitting at two arbitrary gigahertz-frequencies, this paper presents a new type of Wilkinson dual frequency power divider, consisting of
The background and purpose, and the current situation of the cost control theory of real estate development project are disscussed in the paper. Problems of cos
Civil airports in China in the last 10 years have expanded substantially, and the construction of airports has come into a period planning to build airports int