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The purpose of this paper is to evaluate the rural public services in a metropolitan suburb and to put forward suggestions for urban rural space governance. Research methods include the two-step floating catchment area (2SFCA) method was used to evaluate the spatial accessibility of education, health care, and old-age care; furthermore, a comprehensive accessibility evaluation model was established. 203 villages in the Shanghai Qingpu District were taken as examples. The results show that there are 61 villages with high comprehensive accessibility mainly in Zhaoxiang and other towns in the Qingdong area. Several are located in the Zhujiajiao town of the Qingxi area, accounting for 30.05% of all the villages and 50.27% of the total population. There are 78 villages with low comprehensive accessibility, mainly located in towns such as Jinze in Qingxi, accounting for 38.42% of all villages and 18.02% of the total population. There are 64 villages in the comprehensive accessibility, mainly in towns such as Liantang, accounting for 31.53% of all villages and 31.71% of the total population. To promote the implementation of the Rural Revitalization, it is suggested that the population concentration policy in a suburb (rural residential regulation) and the effective supply of rural public service be considered as a whole. The basic public service circle of “30 minutes” in the metropolis countryside should also be planned. [ABSTRACT FROM AUTHOR]

Chinese industrial parks present noticeable problems, including expansion, upscaling, attracting investment and potential, improving efficiency, and planning. This results in a major contradiction, namely, the shortage of land resources on the one hand and their inefficient use on the other; thus, there is need for a system that can reduce inefficient industrial land use. This study uses different methods to analyze the conflict between supply and demand in the existing system of reducing inefficient industrial land use. It is based on a comprehensive analysis of the associated methods and processes currently in use. Among other suggestions, it also proposes an innovative mechanism for reducing inefficient industrial land use. [ABSTRACT FROM AUTHOR]

5G communication, energy internet, new energy automobiles, quantum technology and other advanced and sophisticated fields have put forward new and higher requirements for the performance of semiconductors. The fourth generation of semiconductor diamond is known as the “ultimate semiconductor” because of its excellent physical and chemical properties. It is considered to be the most ideal material for developing the next generation of high power, high frequency, high temperature and low power loss electronic devices. However, the technical bottleneck of shallow n-type doping has hindered the development of diamond semiconductor applications to a certain extent. The research of surface terminals has provided new strategies for the development of diamond functionalization. Diamond has realized important applications such as field effect transistors, Schottky diodes, solar-blind ultraviolet detectors, electronic emission devices and near-surface color center tuning through surface terminals. The mechanism of surface terminals exerting effects is inseparable from the characteristics of their energy band structure. In this paper, the research methods of energy band structure of several common terminals are summarized, the characteristics of their energy band structures are analyzed, the mechanism of exerting effects in combination with the characteristics are introduced, finally prospected. [ABSTRACT FROM AUTHOR]

Due to the extensive expansion of urbanization since 1990s in Shanghai, there are serious problem in industrial land use, such as low efficient, high pollution risk and decentralized spatial layout. As the first city in China committing to limit the total amount of land allocated for construction, Shanghai plays a critical role in informing reducing industrial land. Reducing industrial land emphasized that the land use should be returned from industrial land to ecological land or agricultural land. Taking Datuan Town in Pudong of Shanghai as an example, this study provides a suitability evaluation method for reducing industrial land in metropolitan suburbs. Geographical Information System tools are used to analyze the 218 industrial land parcels in the whole town. Results indicate that: 1) Among the five factors influencing the reduction suitability of the 218 industrial land parcels, the values of pollution and energy consumption showed the biggest difference, while the value of rationality of layout had the smallest difference, and willingness of land right owners had the biggest difference in spatial distribution. 2) When the suitability grade of reduction of industrial land increases, the industrial land parcels become more sporadic. The average area of parcels varieties from 9 507 m2 in suitability grade 1 to 3 300 m2 in suitability grade 5. 3) According to the evaluation index value and its spatial distribution, five suitable grades are classified. The total area of parcels in the first grade is 24.06%, in the second grade is 21.51%, in the third grade is 29.45%, in the fourth grade is 12.63% and in the fifth grade is 12.35%. The distribution of the area in different grades is close to the normal distribution. 4) The industrial lands which are suitable for reducing before 2020 are mainly located in Zhaoqiao Village, Shaocun Village, Tuanxin Village, Jinyuan Village and Jinshi Village. The industrial lands which are not suitable for reducing before 2020 are mainly distributed in Tuanxi Village, Guoyuan Village, Longshu Village, Zhennan Village and Chezhan village. The method proposed in this paper not only can be used to evaluate the suitability of reducing industrial land in one city, but also can be used to compare the suitability reducing industrial land among similar cities so as to improve the coordination of the industrial reduction on a larger scale. [ABSTRACT FROM AUTHOR]

Nanodiamonds have shown excellent mechanical properties, thermal conductivity, biocompatibility and structural tunability, and have been widely demonstrated their application in the fields of composite materials, electrochemistry, catalysis, medicine and so on. In industry, the mass production of nanodiamonds by detonation method provides a foundation for their application. Due to the complex surface structure of nanodiamonds, precise control is required to achieve the target performance and the research on surface functionalization is of great practical significance. This review firstly introduces various surface modification methods of nanodiamonds, then focuses on the impact of surface functionalization research on the application of nanodiamonds in mechanical properties, catalytic properties and biomedical fields, and finally prospects the future research direction of nanodiamonds. [ABSTRACT FROM AUTHOR]

MEMS, deep space and deep sea exploration tasks put forward higher requirements for long-term and portable power supply. Due to its high energy density and stable power output, isotopic battery can continuously provide energy for Lunar Rover and seabed detector in extreme environments such as high and low temperature and no sunlight. As the main type of isotope battery, radio-voltaic effect isotope battery has been widely studied because of its high theoretical energy conversion efficiency and easy miniaturization, and it has been successfully applied to cardiac pacemaker. The isotope battery made of energy converters using semiconductor with wide band gap can obtain higher energy conversion efficiency. The 5. 5 eV band gap and radiation resistance of single crystal diamond make it the best choice for making energy converters for radio-voltaic effect isotope batteries. With the development of chemical vapor deposition technology, the epitaxial technology of diamond crystal has made rapid progress, which has laid a material foundation for the development of diamond semiconductor devices. The characteristics of common semiconductor materials for energy converters and radiation source materials for isotopic battery are compared in this paper, the basic principle of radio-voltaic effect is introduced, then the key parameters of radio-voltaic effect isotopic battery is analyzed, and the literatures on the research of diamond radio-voltaic effect isotopic battery are summarized. The development status and existing problems of diamond isotope battery are pointed out. By analyzing the current performance and application of hetero pn junction composed of diamond and other n-type semiconductor materials, the structural design of high-performance isotope battery based on diamond hetero pn junction is given, summarized and prospected. [ABSTRACT FROM AUTHOR]