Under China's mixed ownership reform, this paper, aiming at exploring the relation among strate-owned equity, board chain and enterprise R&D investment, from a dual perspective of resource reliance and deputy theories, selects China's A-share high-tech companies' 2010 to 2019 panel data, uses fixed effect regression model to deeply study the multiple mechanism of action among state-owned equity, board chain and enterprise R&D investment，and the robustness test and heterogeneity analysis were carried out. Board chain has an influence factor at 0.226 on R&D investment, outstandingly above 10%, indicating its positive influence, helpful for enterprises to gaining innovative resources from external environment and organizations. Regression coefficients of state-owned equity to board chain and to enterprise R&D investment reach to 0.907 and 1.191, both outstandingly above 5%, suggesting their positive correlation. The influence of state-owned equity on R&D investment still remains obvious after board chain as a mediating variable added, regression coefficient down to 0.180 from 0.191, and outstanding above 5%, indicating that the board chain plays a mediating role between state-owned equity and enterprise R&D investment. The influence coefficient of the interaction term between state-owned equity and board chain is -3.299, outstandingly above 5%, indicating that stateowned equity  plays a moderating role between board chain and enterprise R&D investment, when the proportion of stateowned equity to total equity is low, board chain has a positive effect on enterprise R&D investment，when the proportion of stateowned equity is high, the board chain has a negative effect on enterprise R&D investment.

General aviation tourism as a new tourism model in China enriches tourism products, fully integrates tourism and improves tourism quality, and is listed as Shaanxi's tourism model during “the 13th Five-year's Plan” This paper reviews the situation of Shaanxi's general aviation tourism and analyze the four driving forces of general aviation tourism development, presents three practical tourism developing modes led by aviation industrial zone, pushed by leading companies and coexisting with multiple subjects. An evaluation index system is set up based on hierarchy gray evaluation to evaluate the three modes with results showing general aviation industrial zone leading mode is rated as premier, the best mode in Shaanxi's general aviation tourism development, the other two are rated as good, of potentials for future.

Scientific measurement of urbanization level is of significance to industrialization, urbanization and harmonious development of economy and society. This paper uses 16 indicators to establish a synthetic measurement index system to evaluate Yulins urbanization level. It applies entropy to measure the synthetic development level of Yulins urbanization, and the development level of its subsystems of population, economy, society and space from 1990-2009. The results show a rising urbanization level, with variance in contribution of its subsystems. Economy subsystem has the highest score and increment, followed by space subsystem. The development of society and population subsystems is slow. The improvement of society subsystem is the key to Yulins urbanization and the slow development of population subsystem will influence the development of economy subsystem in the future.

Medical minerals are a part of non-traditional mineral resources. This paper studies the medical minerals from a view of industrial economy, lists the commonly-used medical minerals in categories, discusses the utilization, analyzes the issues in utilizing the medical minerals, and presents some approaches to the sustainable development.