The research on adolescents' health is one of the main topics in the field of health geography. The health problems in one's teen age tend to have some potential influence in his adulthood, especially the health behaviors. Compared to adult, drug abuse of a teenager is more harmful to one's brain and more likely to lead to addiction. The study of factors that affect drug abuse among middle school students, will contribute to interventions introducing and health risks reducing. Previous researches focused on the factors that lead to drug abuse, including individual, neighborhood and regional factors. But less literature focused on the surrounding built environment of schools or studied the mechanism leading to the differences in the health behavior of different regions. This paper tries to fill in the gaps by a case study of 124 middle schools in Guangdong province, China. Using the factorial ecological analysis and cluster analysis to explore the social spatial structure of the districts in which sample schools located, as well as the multiple stepwise regression models, this paper explores the situation and factors that affect middle school students' drug abuse in different social areas. The results reveal that there are differences in the incidence of drug abuse among middle school students in different social areas. The incidence of young floating population gathering areas is the highest, followed by the aging areas. And the local business practitioners gathering areas have the lowest incidence. In the young floating population gathering areas, built and social environments such as the high proportion of students who would go to internet bars, game centers, and billiard parlors in their free time, as well as the high density of internet bars and game centers within 1000 m around the school, will cause a high incidence of drug abuse among school students. In the aging areas, characterizing good social supervision, the built environment such as the high density of intersections helps to reduce the risk of drug abuse among students. In the local business practitioners gathering areas, family factors such as harmonious family relationship help to reduce drug abuse among students. Meanwhile, if middle school students have more pocket money, they have more chances to buy drugs, and are more likely to suffer from the drug abuse.

In recent years, the innovation study has received more and more attention from Western human geography scholars, and has become a new direction of Western human geography studies. Taking the Web of Science (WOS) as the literature search engine, this paper chooses 14 geography journals indexed by SSCI among the top 500 journals which published articles with the theme of innovation as literature sources. The data cover a total of 2048 English literature records associated with the innovation topic from 1982 to 2015. Based on the platform of CiteSpace which shows the relationship between evolution and structure for knowledge, we made keywords co-occurrence analysis and references co-citation analysis, and drew a map of knowledge that visualized research hotspots, intellectual base and evolution route of Western geography of innovation. We found that: firstly, there has been a significant increase in the number of the published articles and emerging keywords of Western geography of innovation, and Western Europe and North America are the two core regions of the distribution of researchers. Recent research points to hot keywords including "technology", "spillover", "cluster", "research and development", and "entrepreneurship". Secondly, the geography of innovation has an obvious evolution subject, but its research contents are broad, and the research topics have not yet focused on. "Global city", "global buzz", "spatialization pattern", "industries", "life-cycle", "Cambridge region", "knowledge", "industrial development", and "regional innovation strategies" are 9 hot topics based on the 32 most cited articles. Thirdly, the development of geography of innovation follows the orientation of economic geography, and is especially affected by the development of the new regionalism, turn trends and evolutionary economic geography, which has shown a clear evolution.

China is now experiencing rapid urbanizatioin. Powerful tools are required to assess its urban spatial policies toward a more competitive and sustainable development paradigm. This study develops a Land Use Transport Interaction (LUTI) model to evaluate the urban activity impacts of urban land-use policies. The model consists of four sub-models, i.e., transport, residential location, employment location and real estate rent. It is then applied to Beijing metropolitan area to forecast the urban activity evolution trend based on the land use policies between 2009 and 2013. The modeling results show that more and more residents and employers in the city choose to stay in the outskirts, and new centers have gradually emerged to share the services originally delivered by central Beijing. The general trend verifies the objectives of the government plan to develop more sub-centers around Beijing. The proposed activity-based model provides a distinct tool for the urban spatial policy makers in China. Further research is also discussed in the end.

Grid cell is the basic unit to express population distribution based on gridded population data. The choice of suitable grid size is very important, as the resolution must be fine enough to capture the desired spatial variation of population within the area of interest. The research on grid size suitability refers to determinate an appropriate grid size for revealing the population distribution difference and the distribution position for human beings in geographical space. It is important to provide improvement in accuracies of gridded population distribution. However, currently little research has been done in this area. Many well-modeled gridded population dataset are basically built at a single grid scale. If the grid cell size is not appropriate, it will result in spatial information loss or data redundancy. Besides, there is scale dependency in the spatial distribution of population. And the characteristics of population distribution patterns are different at varied grid scales. This study designed a scheme on grid size suitability evaluation method. The rural area of Xuanzhou District in Anhui Province was selected as the study area. The research on grid size suitability was carried out by constructing three kinds of expressed levels, which included location expressed level, numeric information expressed level and spatial relationship expressed level. The scheme on choosing suitable grid size was determined in combination of grid size-indicator value curves. Then the suitable grid size was selected and its rationality was evaluated. Results reveal that comsidering three expressions of location, numeric information and spatial relationship, 40 m and 50 m grids are relatively suitable grid size, which can be recommended as the appropriate scale for generating a high-quality gridded population distribution in the study area. Based on the preliminary study, result also indicates that it is reasonable and effective to assess grid size suitability by the evaluation method in three perspectives of expressed level. It is expected that the method on grid size suitability can make contributions to the advancement of accurate gridded population mapping.

The core content of ancient Chinese cartography is "the six principles of cartography" pioneered by Pei Xiu (Hawn) in the 3rd century, which was subsequently developed by several generations of renowned cartographic experts in China. A large number of highly valuable ancient and modern maps had been completed by the end of the 19th century. Eleven Chinese world-renowned maps were selected based on the author’s personal participation in the Basic Science & Technological Special Program National Project, which also referred to three ancient Chinese atlases (published in AD 1990-1997). The eleven maps include the following: Dixing Fangzang Tu (a general map), the first scientific map produced in the 3rd century; Hainei Huayi Tu (a general map covering Asia), made in the 8th century; Astronomical figure, a first scientific star figure depicted 1440 constellations made in 1190, which was the original drawing of Suzhou stone carving astronomical figure; Yu Ditu (a general map), made in 1315, which marked the perfection of ancient Chinese cartography; Daming Hunyi Tu (a general map), made in 1389; Genglu Bo (a South China Sea chart used by fishermen), and Zheng He's Nautical Chart, made in the 15th century; Guangyu Tu (a comprehensive atlas) made in 1541; Kunyu Wanguo Quantu (a large Chinese world map in color), made in 1602; Kangxi Quanlan Tu (a general map), which was the first large map including measurements of latitude and longitude made in 1718; Haiguo Tuzhi (a world atlas and annals), which is the predecessor of the contemporary and modern Chinese world atlases made in 1842-1852. The discussion of these ancient maps focused on their scientific, historical, foreign, sailing, territorial, military, and cultural values. Simultaneously, we evaluated their innovations and evolution of map-positioning technology between Chinese and Western cartography. Finally, we hope that the National Bureau of Surveying and Mapping of China provide more support and promote the construction of an ancient Chinese map ecosystem to accelerate the use, evaluation, and mining of the heritage of ancient Chinese maps.

The cluster development of academic journals has become an international trend. Foreign publishing groups have long retained the dominant position in sci-tech periodicals, while the cluster development of Chinese sci-tech periodicals is still at the initial stage. After the continuous efforts of nearly a decade to actively and creatively respond to the development opportunities and challenges of foreign and domestic journals, since 2006, Chinese geographical and recourse journals and their staff have basically completed the strategic development planning of Chinese geographical and resource journals cluster service platform and successfully launched 14 outstanding multiple value-added journal products include a cluster service platform site (www.geores.com.cn) with 54 joined journal and comprehensive module functions, a unified online editing system, the structurization of underlying data, rich media publishing, mobile phone APP and the WeChat service public number, data publishing, scientific cloud assistant system, media publicity and promotion, authoritative expert database of geography and resources in China, Chinese geographical conference service system, Chinese Geographical Editing and Publishing Annual Conference, the occasional thematic journal salon, China Geographical and Resources State Express policy and popular science edition, excellent papers of influential Chinese geographical journals etc. With clear business ideas, bold action, solid and orderly work, complete cluster function and high input-output ratio, the realization of two fundamental transformations have been promoted greatly, which is the Chinese Geographical and Resources Journals publishing from the traditional paper to the rich media, and from the literature producer to the academic and social integrated knowledge service platform, thus the Chinese Geographical and Resources Journals have further taken the initiative, grasped the opportunities, and opened a new situation and a new era of the cluster development.

Despite increasing importance of academic papers in global knowledge flows, the structural disparities and proximity mechanism related to international scientific collaboration network attracted little attention. To fill this gap, based on data mining from Thomson Reuters' Web of Science database in 2014, its heterogeneities in topology and space were portrayed using visualizing tools such as Pajek, Gephi, VOSviewer, and ArcGIS. Topologically, 211 countries and 9928 ties are involved in global scientific collaboration network, but the international network of co-authored relations is mono-centricand dominated by the United States. It exhibits some features of a "small-world" network with the smaller average path length of 1.56 and the extremely large cluster coefficient of 0.73 compared to its counterpart, as well as the better-fitting exponential distribution accumulative nodal degree. In addition, the entire network presents a core-periphery structure with hierarchies, which is composed of 13 core countries and the periphery of 198 countries. Spatially, densely-tied and high-output areas are mainly distributed in four regions: West Europe, North America, East Asia and Australia. Moreover, the spatial heterogeneity is also observed in the distributions of three centralities. Amongst these, the countries with greater strength centrality are mainly concentrated in North America (i.e. the US and Canada), Western Europe (i.e. the UK, France, Germany, Italy and Spain), and China, noticeably in the US, which forms the polarizing pattern with one superpower of the US and great powers such as China and the UK. Similarly, the big three regions consisting of West Europe, North America and Asian-Pacific region have the peak betweenness centrality as well. Slightly different from the two above, the distribution of nodal degree centrality is uneven in the world, although regional agglomeration of high-degree countries is still observed. Last but not least, the proximity factors of its structural inequalities were also verified by correlational analysis, negative binomial regression approach and gravity model of STATA. The findings further confirm that geographical distance has weakened cross-country scientific collaboration. Meanwhile, socio-economic proximity has a positive impact on cross-country scientific collaboration, while language proximity plays a negative role.