中国省际工业生态效率空间分布及影响因素研究

将中国30省市（不含港、澳、台和西藏地区）作为研究对象,进行省际工业生态效率空间分布及影响因素研究。首先构建中国省际工业生态效率评价指标体系,其次利用DEA-BCC模型结合Malmquist指数对2006~2015年中国30省市在时空两个维度上的工业生态效率进行测算,再次运用Geoda软件分析中国工业生态效率的空间分布特征,最后通过空间误差模型对中国工业生态效率的影响因素进行检验。研究结果表明：① 中国工业生态效率虽呈现小幅度下降趋势,但整体效率水平较高;30省市之间存在明显差异性,呈现出东部>中部>西部的分布格局。② 中国工业生态效率Malmquist指数增长率水平较高;30省市Malmquist指数均为正向增长,呈现出稳定增长趋势;技术进步效率是Malmquist指数的主要推动力。③ 中国30省市工业生态效率呈现正向空间自相关性,且存在明显的集聚状态,近邻效应显著。④ 中国省际工业生态效率的主要影响因素有经济发展水平、产业结构、政府规制、技术进步、外商投资和产业集聚。     

珠江三角洲区域一体化研究综合信息系统的设计与应用

在分析地理信息系统技术发展与应用现状的基础上,设计了珠江三角洲区域一体化研究综合信息系统的结构框架。根据珠江三角洲的实际情况,并在经济地理学,城市地理学,区域科学等理论的指导下,开发了针对该区域一体化研究的模型分析系统。基于元数据库的数据集成与模型管理技术,能对不同数据源,不同数据类型与时空特性的多元数据处理与分析。本综合信息系统在区域产业布局,资源窨组合,城市体系空间结构演化等方面得到应用,将为     

Perceptions of climate change in China: The research and policy connection

Global climate change has evolved from a scientific problem into an economic and political problem oI worlOwloe rater- est. National perspectives play a crucial role in addressing climate change. Mutual understanding of perspectives is nec- essary to result in rational policies and a consensus among stakeholders with divergent interests. Conceptual frameworks for understanding the problem of climate change in China, the largest developing country and the largest greenhouse gas emitter, are of great significance to national and international efforts to address the problems of climate change. Chinese perceptions of climate change as a sustainable development problem have recently been in tension with an emerging Western perspective that frames climate change as a security issue. This paper explores Chinese perceptions of climate change as expressed in recent governmental policy statements, public opinion surveys, and academic scholarship with a focus on publications in Chinese-language journals, often unfamiliar in the West. It looks at the relationship between Chinese research and policy and finds that the Chinese policy frame of climate change as a sustainable development problem draws from the body of domestic research and is reflective of the perspectives and multidisciplinary approach of Chinese researchers in areas of climate change.     

Timing analysis of the black hole candidate EXO 1846-031 with insight-HXMT monitoring

We present the observational results from a detailed timing analysis of the black hole candidate EXO 1846-031 during its outburst in 2019 with the observations ...     

A density-based approach for detecting network-constrained clusters in spatial point events

Existing spatial clustering methods primarily focus on points distributed in planar space. However, occurrence locations and background processes of most human mobility events within cities are constrained by the road network space. Here we describe a density-based clustering approach for objectively detecting clusters in network-constrained point events. First, the network-constrained Delaunay triangulation is constructed to facilitate the measurement of network distances between points. Then, a combination of network kernel density estimation and potential entropy is executed to determine the optimal neighbourhood size. Furthermore, all network-constrained events are tested under a null hypothesis to statistically identify core points with significantly high densities. Finally, spatial clusters can be formed by expanding from the identified core points. Experimental comparisons performed on the origin and destination points of taxis in Beijing demonstrate that the proposed method can ascertain network-constrained clusters precisely and significantly. The resulting time-dependent patterns of clusters will be informative for taxi route selections in the future.     

The application and comparison of several flux profile relations in CoLM

This paper discusses the important role that flux profile relations play in momentum flux, sensible heat flux, and latent heat flux simulations in CoLM （Common Land Model） and compares the application of three flux profile relation schemes in CoLM by means of the Loess Plateau Land-Atmosphere Interaction Pilot Experiment （LOPEX） of 2005. It reveals that the results simulated by the model barely changed in the original flux profile schemes of the models a~er eliminating the very stable condition and the very unstable condition, and there were only tiny changes in numerical values. This indicates that the corrected terms added to fm（ξm）,fh（ξh） were very tiny and can be ignored under very stable and very unstable circumstances. According to a comparison of the three flux profile relations, the simulation results were basically coherent by using any CoLM： the correlation coefficient of the simulation value and the observed value was 0.89, and this bears on the coherence with the numerical procedures for the flux pro- file relations under unstable circumstances. The simulation results were improved considerably by utilizing the Lobocki flux pro- file schemes, which numerical procedures under unstable circumstances differed significantly fi＇om other three flux profile schemes; in this case the correlation coefficient of the value of simulation and the observed value became 0.95. In the next itera- tion of this study, it will be of great importance for the development of the land surface process model to continue experimenting with the application of some novel flux profile schemes in the land surface process models in typical regions.     

云南省出口东盟的特征及其经济和就业贡献率分析

利用海关信息数据、统计年鉴数据、相关贸易指标以及投入产出方法分析云南省与东盟之间的出口贸易特征,出口带来的经济和就业贡献。结果表明：云南省与东盟之间的贸易依赖关系显著增强,但是与东盟联系强度的空间分布不均匀,同时云南对东盟的出口产品出现升级特征,由矿产品、化工产品为主的出口转向了以农产品、电子制造产品为主的出口。云南省出口东盟农林牧渔产品对本省经济和就业贡献率最大,对农林牧渔产品深加工,有助于云南省的经济增长和保障就业,同时也有助于促进产业发展向技术密集型产业转型。     

清代东北地区土地开发及其动因分析

论述了清代东北地区土地开发过程、特点和趋动因子。指出封禁时期土地开发主要集中于辽河流域及辽西地区,吉、黑两地只有零星开发,总的呈现一派大荒景象。开禁后,先后在奉天、吉林、黑龙江进行了大面积的放垦。大规模的移民和高速度的土地开发世所少见。最后分析了影响东北地区土地开发的主要趋动因子,指出巨大的人口压力、连年的大灾荒以及清朝政府的土地开发政策是造成清代晚期东北地区大规模移民和高速度土地开发的重要原因。     

蒙古野驴(Equus hemionus)昼间行为时间分配初探

于2007 年和2010 年采用焦点动物取样法研究了新疆卡拉麦里山有蹄类野生动物保护区蒙古野驴昼间行为时间分配和活动节律,共采集行为数据460 h,观察蒙古野驴2 760 头次,将蒙古野驴昼间行为分为采食、移动、警戒、休息和“其他”5 类。采用卡方检验分析不同季节各种行为时间分配,结果表明：季节因素对蒙古野驴行为时间分配存在极显著影响（χ2=79.06,df=12,P<0.01）。采用ANOVA分析同季节不同行为间差异,结果表明,春季：移动、警戒、“其他”两两间无显著差异（[WTBX]P＞0.05）,其余两两间差异显著（P＜0.05）;夏季：仅移动与“其他”间无显著差异（P＞0.05）;秋冬季：仅警戒与“其他”间无显著差异（P＞0.05）。对蒙古野驴昼间活动节律研究结果表明,蒙古野驴采食时间比例在春季各时段均较高（＞45%）,仅中午（14:00～15:00）有1个低谷（27.62%）,夏秋季则为晨昏采食模式,冬季采食峰值（87.85%）在中午时段（13:00～14:00）。休息和采食高峰在各季节交叉出现,呈现此消彼长的趋势。各季节移动主要发生在晨昏时段。蒙古野驴以特定的行为时间分配模式和活动节律适应环境条件季节性变化,如气候条件、食物资源、人为干扰、生理期、昼间长度、捕食风险等。