Effect of protective coal seam mining and gas extraction on gas transport in a coal seam

A gas–solid coupling model involving coal seam deformation,gas diffusion and seepage,gas adsorption and desorption was built to study the gas transport rule under the effect of protective coal seam mining.The research results indicate:(1) The depressurization effect changes the stress state of an overlying coal seam and causes its permeability to increase,thus gas in the protected coal seam will be desorbed and transported under the effect of a gas pressure gradient,which will cause a decrease in gas pressure.(2) Gas pressure can be further decreased by setting out gas extraction boreholes in the overlying coal seam,which can effectively reduce the coal and gas outburst risk.The research is of important engineering significance for studying the gas transport rule in protected coal seam and providing important reference for controlling coal and gas outbursts in deep mining in China.

Discussion on the Current Situation and Artistic Characteristics of the 4 Intangible Cultural Heritage Relics Worldwide

Nowadays, with the rapid economic and technological development, people＇s material and spiritual requirements has got great satisfaction. In the course of historical development, ancestors of human beings created incomparable cultural heritage relics and spiritual civilization with their diligent hands and the great wisdom left us countless cultural heritage relics, many of them have become the famous wonder of the world. These civilizations and cultural heritage are located in Asia, Europe and America, Africa, for example, the Egyptian Pyramids, Acropolis in Athens. Mayan Civilization in Mexico, Mogao Grottoes of Dun Huang of China, Qin Terra-Cotta Warriors and Horses Figurines, Angkor Wat-Cambodia, Venice-ltaly, the Buddhas of Bamiyan in Afghanistan. The essay will mainly choose the 4 most famous representative cultural heritages worldwide to discuss their artistic characteristics, current situation and damage level and effective protective measures.

Integrated Development of the Tourism and Protection of Ancient Towns

Local color is not only the cultural counter in the competition between cities,but the main cultural element that attracts foreign tourists.In recent years,many cities have regarded tourism development as a major mean of reviving ancient towns.The excavation of local culture,material reconstruction of local characteristics,and the resurgence and"reproduction"of local industries have become an important work in the tourism development of ancient towns.Apart from the discussion of the protection,inheritance,and touristification of tangible cultural heritage and intangible cultural heritage,this paper demonstrated the possibility of the integration and production capacity of local characteristic industry resources and analyzed the impact of the integrated development on the lifestyle and living atmosphere of residents in the ancient towns.In this paper,ways to realize the integrated development of the tourism and protection of ancient towns were included as follows:(1)to ensure the principal status of local residents and give full play to their initiatives;(2)to protect the local traditional way of life and improve the public service system;(3)to choose the appropriate development pattern and achieve the diversified development;(4)to improve service facilities in tourism and adjust the structure of tourism products.