China's Forest Sector Markets: Policy Issues and Recommendations
SUMMARY Based on the papers contributed to this Special Issue and other studies an effort is made to identify the major policy issues facing the Chinese forest sector. The policy analysis is organized around the so-called ‘supply china’ (from stump to final products' markets). The discussion of policy issues and implications centers on the identified large and growing gap in the demand/supply balance of forest products. A major problem to carry out the policy analysis is the identified lack of consistent and transparent data for the different components of the ‘supply chain’. This is a situation which must be substantially improved in order to undertake relevant policy setting for the Chinese forest sector.
Development of sustainable forestry plantations in China: a review
While the title suggests a review of all forestry plantations in China, the majority of the book is dedicated to documenting the development of eucalypt plantations in southern China. The fi rst chapter provides an overview of China’s existing forest resources and the Chinese timber processing industry, highlighting an increasing imbalance between the rapidly escalating demand for wood products and the capacity of its forests to supply. While the per capita wood consumption is much lower than world average, a population of 1.3 billion creates a massive demand for forest products. This demand is increasing rapidly as the Chinese economy booms, and despite a doubling of plantation area since 1990 the conclusion is drawn that China will need to make up the substantial defi cit from imports for decades into the future. Fast growing, short rotation eucalypt plantations are providing an increasing proportion of the domestic production of wood products. Since the establishment of the People’s Republic of China in 1949, ownership of forest resources and Government forest policies have undergone substantial changes. In the second chapter Turnbull provides a very relevant summary of the substantial impacts these changes had on the nation’s Hearing a different drummer: a new paradigm for the ‘keepers of the forest’
Time‐domain analysis of yagi‐uda antennas using the FD‐TD method
The fundamental importance of the Yagi-Uda antenna is its structural simplicity and its director and reflector actions. To fully comprehend the working principle of this antenna, it is important to be able to visualize the radiation mechanism directly in the time domain. In this paper, transient analysis of the Yagi-Uda antenna is performed using the FD-TD method. First, the input impedances and directivities obtained by this method are compared with the moment method, good agreement was found between the two methods, and the validity of this method was demonstrated. Next, the quasi-impulse responses of the antenna are calculated. The field pattern obtained by this method was visualized in the time domain. The radiation from the antenna edge is shown in the early time responses, and dispersion of the pulse shape with the passage of time is shown in late time responses. Moreover, the difference of characteristics due to the length of parasitic elements is shown by time-domain observation.