Spatial–temporal distribution and geographic context of Neolithic cultural sites in the Hanjiang River Basin,Southern Shaanxi,China

Understanding how to live successfully within our environment is among the most pressing challenges facing contemporary society. This paper probes the problem based on comparative analysis and discusses the relationship between the spatial–temporal distribution of the Neolithic cultural sites and the geographic context in the Hanjiang River Basin in the south of Shaanxi Province, China. Archaeological studies have identified 175 Neolithic cultural sites in the study area, with a sequence of Laoguantai (¹⁴C age 8–7 ka BP), Yangshao (¹⁴C age 7–5 ka BP) and the late period of the Neolithic Age (¹⁴C age 5–4 ka BP). The total number of archaeological sites, the distribution area and the density all showed an early ascending and later descending trend, but the proportion of the number of archaeological sites in the study area to the corresponding value of the entire Shaanxi Province declined sharply. Spatially, these sites were concentrated on the terraces of the Hanjiang River and its main tributaries with an altitude of 400–800 m. Multiple data were integrated to clarify the critical effects of tectonic and geomorphologic conditions on the distribution of the Neolithic sites. Further comparisons revealed the correlation of Holocene climate change and environmental evolution with the Neolithic cultural succession in the study area that ameliorated conditions to generally promote the development of the primitive culture while degeneration coincided with the culture's transition or interruption. The discussion on the origin of the primitive culture and the temporal–spatial distribution corresponding to the regional culture differentiation sheds light on the complex and dynamic human–nature interaction system during the Neolithic Age, thus emphasising the wider field-based investigation and high-resolution reconstruction works of the palaeoclimate and palaeoenvironment in the future.     

SLIDING MODE CONTROL OF BUILDING FRAMES UNDER RANDOM GROUND MOTION

A sliding mode control theory is presented to control the response of building frames to predominant frequency components of the random ground motions. The control algorithm is derived based on a sliding surface which is a function of a state vector containing the structural displacements and velocities and variables that dictate the predominant frequency components of the excitation. Three control mechanisms are employed to control the response of the building frame namely, (1) active mass damper (AMD) placed at the top storey of the building, (2) an actuator placed at a storey level and, (3) an actuator placed at a storey level along with a tuned mass damper (TMD) situated at the top storey level. Responses obtained by the proposed control strategy are compared with those obtained by the linear feedback and feedforward-feedback control strategies (conventional control strategies). Also, they are compared with those obtained by the sliding mode control strategy that considers in its state vector only structural displacements and velocities. It is shown that the proposed control strategy generally performs better than other control strategies in the higher range of control forces. For the lower range of control forces, conventional control strategies are more effective.     

多源大数据下的北京市居民就餐活动与城市空间关系探究

融合了位置和文本信息的社交媒体数据为城市空间研究提供了有力的数据支撑,也为发现其背后隐藏的人类行为时空模式及规律提供了可能.本文构建了文本信息挖掘技术与空间分析有机结合的居民时空行为研究框架,利用2017年微博数据,采用BERT与Fast.AI结合的文本分类模型,结合LDA主题模型进行文本主题挖掘,对北京居民日常就餐活...     

青海省发展工业循环经济的模式选择和主要任务

青海省发展工业循环经济,应根据资源禀赋、产业特点、工业经济发展程度等因素,选择出适合本省实际的工业循环经济发展模式,抓好资源开发、资源消耗和废弃物利用三个环节,紧紧围绕青海省的主要工业行业以及柴达木循环经济试验区的建设,提升工业发展的产业关联度,形成多产业横向扩展和资源深加工纵向延伸相结合的循环型工业,实现青海省工业循环经济的健康快速发展。     

树立和落实科学发展观推进经济增长方式的根本性转变

党的十六届三中全会提出的科学发展观,对我国经济保持可持续发展和现代化顺利实现具有极其重要的意义。以科学发展观为指导,大力推进经济增长方式的根本性转变,不仅是妥善应对我国经济社会发展关键时期可能遇到的各种风险和挑战的唯一选择,也是全面贯彻和落实科学发展观的必然要求。     

西部大城市居民通勤特征及其与城市空间结构的关系研究——以成都市为例

以成都市为实证研究对象,在大规模问卷调查的基础上,对西部大城市居民通勤基本特征进行了研究。分析发现,西部大城市居民通勤方式以公共交通为主,选择私家车作为通勤工具的比例较高;大部分居民的通勤时间在30分钟以内,通勤距离小于5km。和北京、广州等东部大城市相比,西部大城市职住分离现象还不是非常严重;不同属性居民的通勤时间存在差异,西方空间错位假说反映的城市社会空间不平等现象在中国西部大城市同样存在并逐步显化;通勤空间组织特征与城市结构以及城市功能分区存在密切的关系;西部大城市的快速发展对居民日常通勤影响较大。     

求新动机、满意度对重游间隔意愿的影响——以凤凰古城旅游者为例

由于重游所带来的经济利益日益凸显,使得重游问题受到学界的广泛关注。本研究以湖南凤凰古城为案例地,采用问卷调查获得基础数据,建立结构方程模型从求新动机、满意度两个方面考究旅游者重游间隔意愿的形成机制。研究发现,在凤凰古城这样的快速发展旅游地,求新动机会直接影响旅游者的短期重游意愿,但对中期、长期重游意愿则没有显著的直接影响,同时求新动机会对满意度产生积极的影响。     

基于时空尺度下陕西省旅游经济差异及形成机制研究

本文选取1998—2007年陕西省10个地级市的旅游综合收入作为主要指标,对陕西省旅游经济的时空差异进行分析。研究结果表明：（1）陕西旅游经济绝对差异不断扩大但相对差异逐渐缩小;（2）空间差异显著但呈现均衡化的演变趋势。进一步的研究显示了旅游资源禀赋和区域经济发展水平是陕西省旅游经济差异形成的主导因素,表明了陕西省是资源和区域经济双重依赖型旅游经济。     

自然保护区的社区参与管理模式探索 --以九寨沟自然保护区为例

九寨沟自然保护区在实践中摸索了一套社区参与景区管理的办法：设立专门机构和利用社区组织对居民进行管理;建立多渠道社区居民就业和参与管理方式;组建股份制旅游经营公司;建立公平的利益分配机制等,这些经验具有实践上的创新和理论上的突破,具有典型性。进一步完善社区管理,需要进一步解决“公平”问题、加强社区居民“实质性”参与、重视区域的协调发展、建立就业培训机制。     

我国世界文化遗产的时空分布——兼论我国世界文化遗产的申报

世界文化遗产已经成为许多旅游目的地的核心吸引物。我国的世界文化遗产数量居于世界第三,主要分布在黄河、长江流域,从遗产项目入选的时间看呈突变型、渐变型和平稳型三阶段特征,入选项目以符合世界文化遗产遴选标准第Ⅱ项和第Ⅲ项的居多,且以佛教文化遗存为多。目前我国比较重视对线性文化遗产、工业遗产、文化景观等的保护。本文认为：下一步开展申报时,要重视目前还没有世界文化遗产的部分省市,以体现文化的权力与利益平衡;在竞争性和选择性语境中,要宽容地对待各种历史文化遗产。