回归还是调整:近年来美国战略界关于“势力范围”的讨论

作为对冷战后自由国际主义外交政策的反思,“势力范围”近年来再次成为美国战略界讨论的一个议题。现实派主张正视力量对比变化的现实,强调谨慎外交,减少不必要的风险和负担,利用盟伴制衡对手。自由派坚持自由国际主义外交,拒绝妥协。归根到底,双方的分歧更多是在如何维护美国主导地位的方式上。作为美国外交调整的风向标,这场讨论展现了美国外交重心向现实主义回调的逻辑和对华政策的趋向。对中国而言,要坚持以平等合作超越美国的话语陷阱,以开放共赢打破其联盟封堵,以主动作为推进全球治理改革。

A Comparative Study of Methods for Delineating Sphere of Urban Influence: A Case Study on Central China

A number of urban and regional plans have been developed with the advancement of urbanization and regional integration, among which the delineation of sphere of urban influence and improvement of integration between the city and its hinterland have be- come vital important for guiding practices. In terms of delineating sphere of urban influence, existing studies have been focused on static study by using single year data or single method, resulting in a lack of time-series longitudinal analysis or comprehensive analysis based on multiple methods This study emphasizes on comparing two methods from both the theoretical and empirical perspective. Both gravity model and improwd field model are applied to the selected study area for measurements and comparison, to explore their strengths and weaknesses. A research framework for comprehensive analysis on delineating sphere of urban influence is proposed. In the end, the differences of deli：aeating methods are illustrated and the feasibility of comprehensive analysis is discussed. Recommendations are provided for selecting appropriate methods for delineating sphere of urban influence or developing regional hierarchy system plans and urban spatial structure schemes.

Managing Accessibility- The Configurational Approach to the Inclusive Design of Urban Spaces

This paper concerns the theme of the universal accessibility to urban spaces, proposing the contribution of configurational approach to their inclusive design. Born in the first Nineties on the roots of the efforts and the studies for reducing material and architectural barriers for disabled people, such discipline extends its sphere and purposes so as to mitigate the effects of spatial exclusion of a wider and wider variety of human categories, up to virtually include any potential urban user. Several questions persuade that a merely functional approach, essentially based on the position of the located activities, cannot be said satisfying： only a configurational approach can account for the effects of the grid configuration on the actual accessibility of its spaces. Our research focuses on Italian urban settlements, which appear as ideal case studies, due to the typical consistency of their urban spaces, which, especially in the inner historical cores, are densely build, geometrically irregular and hence generally far from actually providing a universal material accessibility. Here the impedance of space is much more than a theoretical hypothesis and concrete interventions are generally requested to eliminate or reduce its barriers and to make space actually and safely usable. Rather than at indicating the technical solution of single urban problems, which of course are strongly different each other, the research aims at defining a method suitable for any local context. Such method, integrating into a reliable tool the configurational vision with the functional and interactional approach, will provide a hierarchy of urban spaces with reference to the necessity of their universal accessibility.

Who Governs Public Health？ Donor Retreat and the Shifting Spheres of Influence in Southern African HIV/AIDS Policy Making

For the last decade, discussions about who governs policy on prevention and treatment of HIV/AIDS have revolved around the controversial relationship between Western donors and the power they have over their recipient governments. While these debates were once politically germane, recent trends show a decline of donor funding, as well as an increase of financial ownership of the epidemic within Southern Africa. Commensurate with this shifting financial influence, some well-governed, wealthy African states are beginning to deviate from global M＆E （monitoring and evaluation） indicators. These policy movements, away from global M＆E indicators, also correlate with increases in HIV prevalence, which signals the need for further investigation into policy efficacy.

＇OBOR＇ and South Asia： Can India and China Cope with the Emerging ＇New Normal＇ in the Region？

Ever since President Xi Jinping announced the ＇One Belt, One Road＇ project in 2013, more than 66 countries across the continent expressed their interest to be part of this grand project of the century. In South Asia, most of the countries embraced the idea except India. There is no doubt that OBOR is likely to have farreaching implications on South Asian politics, economy and security. China has been engaging in the region through various economic and development projects for last two decades. This has raised serious security and strategic concerns in India. China＇s growing bilateral trade investments and development-oriented connectivity projects in India＇s neighbourhood have been popularly dubbed as China＇s ＇String of Pearl Strategy＇ aimed to contract India＇s sphere of influence in the region. There is a deficit of trust between emerging India and rising China over their interests and intentions. Many observers, however, view OBOR as a game changer at least in South Asia, where this would necessitate re-alignment and re-balancing. But, how does India perceive this project is a matter of serious concern that would shape the nature of implications on South Asia？ In this context, this article examines the impact of OBOR on South Asia Region from sub-regional perspectives and it explores how China can play a constructive role by reconciling its grand strategy with national interests of South Asian countries in order to minimise the adverse impact of OBOR [especially China-Pakistan Economic Corridor （CPEC）] on the peace and security of the region through effective CBMs.

Establishment and Analysis of the Spectral Relationship Between Range-Rate and Gravity Potential Based on Energy Conservation

The spectral relationship between range-rate measurements and the gravity potential for low-low satellite-to-satellite tracking mission was established based on the energy conservation theory. Then the performances of satellite separation, the orbital altitude, and the accuracy of range-rate measurements in recovering the earth＇s gravity field were simulated and analyzed by this method. Finally, the cumulative geoid errors of the reference mode were obtained by using the configuration parameters of the GRACE mission. By comparing the cumulative geoid errors of the reference mode and GGMO2S and EIGEN-GRACEO2S models, it basically reflected the performance of GRACE and proved the feasibility of this method.