三种基于Cesium的重庆市漫游飞行算法及其对比分析

漫游飞行在数字地球、虚拟现实和仿真等领域有着广泛的应用。以往的研究多集中于客户机/服务器(client/server,C/S)结构的桌面端应用程序,本文以浏览器/服务器(browser/server,B/S)结构下的Web端开源三维地理框架Cesium为基础构建虚拟地球,设计了三种不同的漫游算法:常规漫游算法、回调函数漫游算法、拉格朗日插值漫游算法,并在地球表面成功加载了重庆市主城区的倾斜摄影模型以实现漫游飞行功能,从帧率(frames per second,FPS)和网络延迟(network latency,NL)两方面对比分析三种算法的有效性。结果表明,常规漫游算法、回调函数漫游算法、拉格朗日插值漫游算法前50 s的平均FPS分别为70、74、80 Hz,平均NL分别为14.145、13.166、12.419 ms。就FPS而言,回调函数漫游算法较常规漫游算法提升了5.714%,拉格朗日插值漫游算法较常规漫游算法提升了14.286%。就NL而言,回调函数漫游算法较常规漫游算法缩短了6.921%,拉格朗日插值漫游算法较常规漫游算法缩短了12.202%。总体而言,算法运行效率从大到小最终排序为:拉格朗日插值漫游算法、回调函数漫游算法、常规漫游算法,即在漫游飞行过程中,回调函数漫游算法、拉格朗日插值漫游算法较常规漫游算法有一定的提升,拉格朗日插值漫游算法可实现更高效、流畅的渲染效果。

The Fuzzy Synthesizing Evaluation of City's Environmental Quality Based on GIOWA Operator:A Case of 13 Cities of Jiangsu Province

In this paper, the generally induced ordered weighted averaging (GIOWA) operator is used to construct the fuzzy evaluating system of the quality of a city’s environment including air, water and noise. Based on the part data of air, water and noise of the 13 cities under the jurisdiction of Jiangsu provincial government in 2002, a case study is given. The evaluating results show that the evaluating system of the quality of a city’s environment based on the GIOWA operator can reflect the condition of pollution controlled and environmental quality of a city in a period of time.

二三线城市保障性租赁住房高质量发展对策研究——基于江苏省S市的调研分析

随着城市化进程的加速,二三线城市正成为人才集聚的新舞台。本文基于对江苏省S市保障性租赁住房主管部门、运营企业和住户的调研数据,剖析了当前保障性租赁住房目前存在的问题,并针对S市保障性租赁住房高质量发展提出了包括加紧落实信贷支持政策、明确项目退出机制、出台“非居改保”细则等一系列对策,以期推动保障性租赁住房市场的健康、有序发展。

基于CLUE-S模型的吴忠市土地利用时空演变及多情景模拟预测

【目的】研究不同情景下的未来土地利用时空演变格局,为合理利用土地资源、科学规划国土空间开发格局和区域高质量发展提供助力。【方法】研究团队以宁夏回族自治区吴忠市为研究对象,选取2000年、2010年和2020年3期土地利用数据,运用土地利用转移矩阵、CLUE-S模型,分析研究区2000—2020年土地利用变化特征,模拟自然增长情景、生态保护情景和经济增长情景下2030年吴忠市土地利用演变特征。【结果】1)2000—2020年吴忠市草地面积占比最大,其次是耕地和未利用地,建设用地面积不断增长;建设用地面积变化最快,并以耕地转化为建设用地为主。2)2030年建设用地面积在自然增长情景下将会减少,生态保护情景下林地面积增幅较大,经济增长情景下各土地利用类型变化较小。3)在3种情景下,吴忠市2030年土地利用结构仍然以耕地、林地、草地为主,建设用地面积在生态保护情景和经济增长情景下将呈增长的趋势,在自然增长情景下将呈减少趋势。【结论】生态保护情景下的预测结果更符合国土空间规划要求和经济社会发展的需求。该研究成果对推动吴忠市未来土地利用格局规划具有重要意义。

Developing a Subjective Evaluation Scale for Assessing the Built Environments of China’s Hygienic City Initiative

Objective To develop a preliminary subjective evaluation scale for assessing the built environments of China’s Hygienic City Initiative and to evaluate its reliability and validity.Methods The initial items of the scale were determined based on a review of policy documents and consultations with experts. The final items of the scale were confirmed through individual interviews with residents combined with the discretetrend method, critical ratio method, correlation coefficient method, and factor analysis method. Then, the dimensions of the scale were determined using exploratory factor analysis(EFA). The Cronbach’s α coefficient, split-half reliability coefficient, and confirmatory factor analysis(CFA) were used to assess the reliability and validity of the scale.Results A scale containing five dimensions with 22 items was established, including urban lifestyle,governance, basic functions, environmental sanitation, and amenities. The Cronbach’s α coefficient of the scale was 0.876, and the split-half reliability coefficient was 0.796. The CFA results indicate that each inspection level was within the standard limit.Conclusion The preliminarily subjective evaluation scale for assessing the built environments of China’s Hygienic City Initiative demonstrates a high level of reliability and validity. Additional empirical studies should be carried out to further verify the value of the scale in terms of practical application.

基于CLUE-S和InVEST模型的苏州市生境质量评估及预测

评估城市化进程中土地利用变化下的生境质量演变,对于构建综合生态规划体系、应对全球可持续发展的重大挑战具有重要意义。基于苏州市2010年和2018年遥感影像解译的土地利用数据和社会经济等数据,选取高程、坡度、到公路的距离、人口密度等驱动因子,采用CLUE-S模型模拟多情景下2030年土地利用变化,并通过生态系统服务评估与权衡(InVEST)模型评估过去并预测未来的生境质量时空演变,探讨土地利用变化对生境质量的影响。结果表明:最优拟合尺度为400 m×400 m,Kappa系数达到0.8545,模型能够很好地模拟研究区未来的土地利用格局;苏州市2030年生态保护情景下的生境质量优于2018年,而2030年自然增长情景下的生境质量差于2010年和2018年;从空间分布看,苏州市中心城区、工业较集中和人口活动强度大的地区生境质量差,太湖周边等水系发达地区生境质量较好。因此,未来研究区在发展经济的同时,更要注重生态保护,实现高质量发展。

Rank-size Distributions of Chinese Cities: Macro and Micro Patterns

A large number of studies have been conducted to find a better fit for city rank-size distributions in different countries. Many theoretical curves have been proposed, but no consensus has been reached. This study argues for the importance of examining city rank-size distribution across different city size scales. In addition to focusing on macro patterns, this study examines the micro patterns of city rank-size distributions in China. A moving window method is developed to detect rank-size distributions of cities in different sizes incrementally. The results show that micro patterns of the actual city rank-size distributions in China are much more complex than those suggested by the three theoretical distributions examined(Pareto, quadratic, and q-exponential distributions). City size distributions present persistent discontinuities. Large cities are more evenly distributed than small cities and than that predicted by Zipf′s law. In addition, the trend is becoming more pronounced over time. Medium-sized cities became evenly distributed first and then unevenly distributed thereafter. The rank-size distributions of small cities are relatively consistent. While the three theoretical distributions examined in this study all have the ability to detect the overall dynamics of city rank-size distributions, the actual macro distribution may be composed of a combination of the three theoretical distributions.

Purchase willingness of new energy vehicles: A case study in Jinan City of China

Speeding up the promotion of new energy vehicles is an important measure to optimize the energy structure,promote energy conservation and emission reduction,and develop the economy sustainability.The research uses a questionnaire survey to analyze the residents’willingness to purchase new energy vehicles in Jinan Gty of China,and utilizes the binomial logistic regression model and Global Moran's I to explain the impact of three factors(including responden ts'personal characteristics and subjective cognition,products,and social environment)on the purchase willingness of new energy vehicles.According to the survey,75.12%of the responden ts consider buying new energy vehicles in the future,but only 11.66%of the respondents know new energy vehicles well.It can be seen that the respondents in Jinan City generally have an insufficient understanding of new energy vehicles.It may lead to a decline in residents’trust in new energy vehicles,which will in turm affect their purchase willingness.Based on the survey,we find that women who live far from the city center enjoy high incomes and have a low-carbon awareness,generally exhibit a higher willingness to purchase new energy vehicles.Spatial distribution of the purchase willingness has certain aggregation characteristics,showing a positive spatial correlation pattern.Purchase willingness has a certain positive diffusion effect in space,and areas with a higher purchase willingness have a positive driving effect on their surrounding regions.Spatial distribution of the purchase willingness can be used as one of the breakthroughs in promoting new energy vehicles.In addition,safety,price,after-sales service,and infrastruicture of new energy vehicles are important determinants of people's purchase willingness.Among the types of subsidies,financial subsidy is most effective on the residents’purchase wilingness.Our research provides an impor tant information for the promotion of new energy vehicles in the region.

Technical Investigation on V2G,S2V,and V2I for Next Generation Smart City Planning

The paper investigates a few of the major areas of the next generation technological advancement,“smart city planning concept”.The areas that the paper focuses are vehicle to grid(V2G),sun to vehicle(S2V),and vehicle to infrastructure(V2I).For the bi-directional crowd energy single entity concept,V2G and building to grid(B2G)are the primary parts of distributed renewable generation(DRG)under smart living.This research includes an in-depth overview of this three major areas.Next,the research conducts a case analysis of V2G,S2V,and V2I along with their possible limitations in order to find out the novel solutions for future development both for academia and industry levels.Lastly,few possible solutions have been proposed to minimize the limitations and to develop the existing system for future expansion.

Study on Landscape Pattern Based on Landsat-8 in the Center of Chengdu City, China

Study on landscape spatial pattern in the center of Chengdu City is based on the Landsat-8 image by using 3S technique and spatial pattern analysis software Fragstats 3.3. The results showed that there covered an area of 193.92 km2 in the center of Chengdu City. 55.24% of the total area was made up of buildings, covering an area of 107.12 km2, and the overall landscape of impervious ground-based. There were 22,666 patches;29.67% of the patches were roads. The human interference of buildings, roads and green space was a maximum;fragmentation of the highest was green space. The fragmentation of overall urban landscape was high;the diversity was low;the value of Shannon’s diversity index was 0.63;the value of Shannon’s evenness index was 0.70. All kinds of landscape distribution were not balanced, and lack of connectivity. This research puts important reference for creating good urban landscape space and restoring the natural ecological environment in the western regions of China.

基于B/S架构的地球物理观测台站管理系统的设计与实现

为做好江苏省地球物理观测台站的运行维护管理工作,解决业务交流不便,尤其是市县台站维护管理缺乏信息化平台等问题,设计实现了基于B/S架构的地球物理观测台站运行维护管理系统,并投入使用。该系统采取任务模式与可视化流程式操作,方便区域地球物理台网中心和台站维护人员快速熟悉并使用,减轻工作负担、提高工作效率,重点弥补了市县站信息化管理薄弱的缺陷,是对全国地球物理台网管理系统的补充和完善。

The Ecological Service Function Development of Urban Modern Agriculture in Tianjin City and Corresponding Countermeasures

Based on the current situation of ecological environment of agriculture in Tianjin City,we divide the ecological service function of urban modern agriculture in Tianjin City into seven types: air regulation,climate regulation,water conservation,soil formation and protection, waste disposal,biodiversity conservation,and ecological entertainment. According to the method for assessing the value of natural ecosystem, coupled with the ecological service value equivalency factor table of China's ecosystem formulated by domestic scholars,we estimate the ecological value in Tianjin City. The results show that the actual ecological value of agriculture in Tianjin City was 30. 752 billion yuan in 2010,close to the agricultural economic value ( 31. 733 billion yuan) in 2010. Finally we put forth the following countermeasures for the ecological function development of urban modern agriculture in Tianjin City: strictly protecting arable land,and raising the standards of compensation for agricultural land requisition; actively and prudently developing facility agriculture,and preventing the blind scale expansion of facility agriculture to better give play to its ecological function; strengthening the construction of ecological agriculture,and promoting the market conversion of the ecological service value of agriculture; improving the environment,to form relatively complete agro-ecological system.

Spatio-temporal Distribution Characteristics and Environmental Impact Factors of Lung Cancer Mortality: A Case Study of Yuhui District in Bengbu City, China

Among cancers, lung cancer is the most common cause of death in China. For the prevention and control of lung cancer, it is necessary to investigate the spatial and temporal distribution of lung cancer mortality, as well as the changes in the trend and the affecting mechanism. Based on statistics and auto-correlation analysis, this paper studied the spatial and temporal distribution of lung cancer mortality in Yuhui District, Bengbu, Huaihe River Basin, from 2017 to 2020. In addition, Spearman’s Rank Correlation Assessment Model and Geographic Detector Model were used to examine the relationship between environmental factors and lung cancer mortality to identify impact factors and their mechanisms. The findings indicated that: 1) from the characteristics of temporal distribution, the number of lung cancer deaths exhibited a linear growth tendency, with the highest mortality in winter;2) from the characteristics of spatial distribution, lung cancer mortality showed a strong spatial agglomeration form, concentrating on two clustering areas, located in the old city and the central city of Bengbu, near the Huaihe River;3) from the point of view of the whole research area, there were 15 impact factors with significant correlation in the built and natural environment factors. The significant impacting factors in the built environment included land use, road traffic, spatial form and blue-green space, which could indirectly affect lung cancer mortality, while air pollution and temperature constituted the significant impacting factors in the natural environment;4) the influence of screened environmental factors on lung cancer mortality was different. Spatial stratified heterogeneity assessment, the interaction among environmental factors demonstrated statistical significance, it was found that the interaction between environmental factors in pairs had a significant enhancement effect on lung cancer mortality. To some extent, urban planning and policies could reduce lung cancer mortality.

Variation characteristics of extreme precipitation from 1955 to 2015 in Shijiazhuang City,Hebei Province

In order to give guidelines for the execution of countermeasures in response to extreme precipitation events.the tempo-spatial variation characteristics of extreme precipitationare are analyzed by 11 extreme precipitation indexes during the past 60 years(1955-2015)in Shijiazhuang City.The results showed that the extreme precipitation of Shijiazhuang City generally showed a downward trend in the past 60 years,and the wet day precipitation(PRCPTOT)exhibited the most obvious downward trend.There were significant spatial differences in the trend of extreme precipitation indexes.According to the spatial superposition of the historical trend of extreme precipitation index and Hurst index,the extreme precipitation intensity indexes in most areas of Shijiazhuang city will continue to decline in the future,and the extreme precipitation intensity indexes in some central areas will continue to rise.

The Racial Prejudice in City in Paul Auster’s Novels

In Auster’s novels,the racial prejudice occupies a vital part;the whites presently take a majority privileged position in the mainstream culture;both the blacks and Jews become the target of racial prejudice which is vividly embodied in City of Glass:The Graphic Novel,Ghosts,Man in the Dark,In the Country of Last Things.

Qualitative and Environmental Aspects Study of Water Distributed in West Algeria： The Case of Sidi Bel Abbes City

Water comes from various different sources, such as lakes, rivers, streams, springs and boreholes. Depending on the quality of its source, water will almost certainly have to be treated to make it safe to drink. All water supplies for human consumption must be well stored, free from micro-organisms, parasites and any substances that endanger public health if found in sufficient numbers or concentrations, in the same time. In our continued effort for a better result in our study of qualitative aspects, by physicochemical and bacteriological analysis, the authors focus in two crucial questions： a） is the water quality of Sidi-bel-Abbes good or bad ,and well stored？ b） is the people of Sidi-bel-Abbes are aware of the importance of water and knowledgeable about how to use this vital？ This study is the first to use data from I real work based upon a developed method and a good investigation to know exactly if water of Sidi-Bel-Abbes is safely treated, well stored and consumed in resemble way. In first, the authors plotted the method in analysing the qualitative aspect of water using developed material for a precise result starting by the distribution connection （condition and management） and the verification of water tank storage and finishing by analyzing the all the aspect of water （physicochemical and bacteriological analysis）. In second, the authors focus on the way that people of Sidi Bel Abbes used and consumption water by introducing a targeted method （questionnaires） which help us a lot to know precisely the way, time and the real quantity of water consumed daily. In final step of our study of qualitative aspects, by physico-chemical and bacteriological, and environmental analyses, investigation processed by PCA （principal component analysis） of the drinking water supplied to Sidi Bel Abbes city （Algeria north-west） concluded by an encouraging result, that despite the various constraints faced by the departments concerned, they ensure the supply of safe drinking water in households almost daily.

From Sequential to Parallel Growth of Cities： Theory and Evidence from Canada

This paper examines city growth patterns and the corresponding city size distribution evolution over long periods of time using a simple New Economic Geography(NEG) model and urban population data from Canada. The main findings are twofold. First, there is a transition from sequential to parallel growth of cities over long periods of time: city growth shows a sequential mode in the stage of rapid urbanization, i.e., the cities with the best development conditions will take the lead in growth, after which the cities with higher ranks will become the fastest-growing cities; in the late stage of urbanization, city growth converges according to Gibrat′s law, and exhibits a parallel growth pattern. Second, city size distribution is found to have persistent structural characteristics: the city system is self-organized into multiple discrete size groups; city growth shows club convergence characteristics, and the cities with similar development conditions eventually converge to a similar size. The results will not only enhance our understanding of urbanization process, but will also provide a timely and clear policy reference for promoting the healthy urbanization of developing countries.

A Critical Regionalism in the Golf Architecture:A Masdar’s‘Eco-city Project’

This article echoes Kenneth Frampton’s critical regionalism to address maintaining the values of the past into the present.For Frampton,architecture design is regionally infused due to essentially dealing with“specificity and locality”,however,remains reluctant to adopt a“universal technology”.A Masdar City’s design represents a valuable case due to casting light on the complexity embedded in intertwining the modernist technologies and a regional architecture.The case study’s analyses cited here suggest that the design of the present evolves from this complexity witnessing a deviation from a“universal technology”and a local architecture.A vernacular style of architecture has been blamed because it stitches together the“globe”and the“local”.A universal technology has been also witnessed here which yields support for the vernacular approaches embedded in a traditional architecture.What Frampton’s critical regionalism appears to overlook are the vernacular approaches that in the analysis of this article embrace a model of the design principles for the“tectonics”to be realised.The key argument brought forward in this article concerns Frampton’s critical regionalism that yet lacks a realistic approach to produce a sense within a local context,thereby needing in its theory to neatly twist the vernacular approaches with a critical regionalism’s synthesis.