旅游地人居空间多功能研究进展与展望     

杨兴柱  殷程强 《热带地理》2022,42(5):813-823

在旅游发展快速驱动下,旅游地人居空间正处于多功能转型的关键阶段。多功能理论为旅游地人居环境可持续发展研究提供了新理论与新范式,也为中国典型地域环境下旅游地人居环境建设与调控开拓了新思路。文章系统梳理和分析了国内外关于旅游地人居空间多功能的概念演变、评估体系、变化特征、驱动机制和适应性调控等方面的研究成果,揭示已有研究的演进路径,并提出未来研究的方向和建议。主要结论包括：1）概念内涵与评估体系层面,研究视域逐渐关注高质量人居空间的多样化需求。2）空间变化特征方面,更多的研究呈现从宏观区域整体描述、中观尺度的村镇重点分析到微观住宅内部空间深入探究的空间转变。3）驱动机制层面,研究结合自然因素与社会因素2个层面来判定驱动因子。驱动力变化呈现初期“自然资源基础决定空间功能类型”,中期“产业发展引领空间功能转型”,后期“人居环境自然舒适追求”的阶段性特征。4）适应性调控层面,研究对策主要通过协调多元主体的社会关系和优化物质空间组合实现。最后,建构了旅游地人居空间多功能研究三阶段的演进路径,提出后续研究关注的重点,包括构建更全面的多功能评估指标体系、多元主体之间多功能诉求的耦合权衡机制,以及自上而下和自下而上相结合的多功能转型优化策略。研究方法方面,跨学科方法的融合与创新将成为一个重要突破。  相似文献   

Yield and cyclic behaviour of a strain space multiple mechanism model for granular materials     

Susumu Iai  Osamu Ozutsumi 《国际地质力学数值与分析法杂志》2005,29(4):417-442

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Electronic Multi-beam Radio Astronomy Concept: Embrace a Demonstrator for the European SKA Program     

A. Van Ardenne  P. N. Wilkinson  P. D. Patel  J. G. Bij De Vaate 《Experimental Astronomy》2004,17(1-3):65-77

ASTRON has demonstrated the capabilities of a 4 m², dense phased array antenna (Bij de Vaate et al., 2002) for radio astronomy, as part of the Thousand Element Array project (ThEA). Although it proved the principle, a definitive answer related to the viability of the dense phased array approach for the SKA could not be given, due to the limited collecting area of the array considered. A larger demonstrator has therefore been defined, known as “Electronic Multi-Beam Radio Astronomy Concept”, EMBRACE, which will have an area of 625 m², operate in the band 0.4–1.550 GHz and have at least two independent and steerable beams. With this collecting area EMBRACE can function as a radio astronomy instrument whose sensitivity is comparable to that of a 25-m diameter dish. The collecting area also represents a significant percentage area (∼10%) of an individual SKA “station.” This paper presents the plans for the realisation of the EMBRACE demonstrator.  相似文献   

Multiple objective evaluation of a simple phosphorus transfer model     

Russell M. S. Smith  Howard S. Wheater 《水文研究》2004,18(9):1703-1720

A simple phosphorus (P) transfer model of the Welland catchment, UK, is evaluated against multiple objective functions using a Monte Carlo approach that combines calibration, identifiability, sensitivity and uncertainty analysis. The model is based on simple conceptual rainfall‐runoff and river routing components, combined with estimates of the daily non‐point source load derived from annual landuse‐based export coefficients, disaggregated as a function of the runoff. The model has limited data requirements, consistent with data availability, and is parsimoneous with respect to the number of parameters identified through inverse modelling. The best performing parameter sets capture the main aspects of the observed flow and total P (TP) concentrations and provide a suitable basis for a decision‐support tool. However, a trade‐off is evident between matching the observed flow peaks, flow recessions and TP concentrations simultaneously, highlighting some limitations of the model structure and/or calibration data. Model analysis indicates that daily non‐point source load cannot be described as a function of near‐surface runoff and land use alone, but that other influences, including seasonality, are important. However, further model development to improve performance is likely to introduce additional complexity (in terms of parameter numbers), and hence additional problems of parameter identifiability and output uncertainty, which in turn raises issues of the information content of the available data. Copyright © 2004 John Wiley & Sons, Ltd.  相似文献   

Triple and Multiple Systems     

Pavel Mayer 《Astrophysics and Space Science》2005,296(1-4):113-119

The triple systems display several interesting effects; and are also important for understanding the origin and evolution of binaries. Namely mutual inclination of two orbits, changes of observed inclination, and problems with the third light will be discussed in this contribution.  相似文献   

北斗三号高边坡实时监测系统应用研究     

邵沛涵  高成发  金俭俭 《测绘科学》2021,46(1):7-14,23

针对高速公路建设过程中因线形和环境需要形成的高边坡会产生的边坡失稳进而造成财产损失和人身安全的问题,该文采用BDS与GPS组合定位方法,初步完成高边坡实时监测系统的设计和数据处理。目前,BDS-3系统已经完成基本系统建设,并向全球提供服务。在中国范围内,可观测到的BDS卫星数量较多、质量较好,该文详细分析了BDS-2、BDS-3和GPS在边坡监测中的应用效果。结果表明,该方案能提高定位精度、改善单系统观测条件较差时定位的稳定性和可靠性,在高边坡变形监测中具有重要应用价值。  相似文献   

地基微波辐射计探测大气边界层高度方法   总被引：4，自引：3，他引：1       下载免费PDF全文

刘思波  何文英  刘红燕  陈洪滨 《应用气象学报》2015,26(5):626-635

采用2013年中国科学院大气物理研究所香河大气综合观测试验站的地基微波辐射计和激光雷达观测数据,以激光雷达探测的大气边界层高度为参考,分别利用非线性神经网络和多元线性回归方法建立微波亮温直接反演大气边界层高度的算法,并对比两种方法的反演能力, 同时分析非线性神经网络算法在不同时段及不同天气状况下反演结果的差异。结果表明:非线性神经网络算法的反演能力优于多元线性回归算法,其反演结果与激光雷达探测的大气边界层高度有较好一致性,冬、春季的相关系数达到0.83,反演精度比线性回归算法约高26%;对于不同时段和不同天气条件,春季的反演结果最好,晴空的反演结果好于云天; 四季和不同天气状况的划分也有利于提高反演精度。  相似文献   

逐步线性回归法实现中华虎头蟹(Orithyia sinica) 形态指标与体重的通径分析   总被引：2，自引：0，他引：2  

来守敏  王仁杰  姜令绪  秦浩  李玉全 《海洋与湖沼》2015,46(6):1438-1443

为探讨中华虎头蟹(Orithyia sinica)形态指标与体重的关系, 为良种选育提供最佳的测量指 标, 实验以中华虎头蟹为材料, 测量甲宽、甲长、眼间距、侧齿间距、大螯不动指长、大螯宽、步足 长节长、体高、体重等26 个指标, 借助逐步线性回归、相关分析和通径分析等方法, 分析形态指标 与体重的关系。结果表明, 除第Ⅳ侧齿间距(A₈)外, 实验所测形态指标与体重的相关系数均达到了显 著水平(P<0.05); 采用逐步线性回归的方法建立了多元回归方程Y=-273.841+10.4X₁+2.867X₂, 其中 Y 为体重(g), X₁ 为右大螯宽(mm), X₂ 为第Ⅱ侧齿间距(mm), 定量分析了形态指标对体重的影响结果。  相似文献   

多级多源控制点影像数据库建立数据分析与处理   总被引：1，自引：0，他引：1  

王月莉  李发红  王占宏 《东北测绘》2012,(5):20-23

地面控制点GCP（Ground Control Point）是表达地理空间位置的信息数据,归结为空间位置坐标、点位局部影像、点位特征描述及说明（点之记）、辅助信息。本文基于＂多级多源控制点影像数据库系统的建立研究＂课题,重点阐述多级多源控制点（GCP）的数据内容及形式、数据的获取方法、数据的组织方案及数据库的概念设计。  相似文献   

Using multiple‐variable indicator kriging to assess groundwater quality for irrigation in the aquifers of the Choushui River alluvial fan     

Cheng‐Shin Jang  Shih‐Kai Chen  Lin Ching‐Chieh 《水文研究》2008,22(22):4477-4489

This work attempted to locate clean and safe groundwater for irrigation use in the Choushui River alluvial fan. Multiple‐variable indicator kriging (MVIK) was adopted to evaluate numerous hydrochemical parameters for a standard of water quality for irrigation in Taiwan. Many hydrochemical parameters in groundwater were distinguished into three main categories—salinity/sodium hazard, nitrogen hazard and heavy metal hazard. Safe and potential hazardous regions of groundwater for irrigation were delineated according to different probabilities estimated by MVIK. The probabilistic results of the classifications gave an opportunity to explore the spatial uncertainty of the hazards and helped government administrators establish a sound policy associated with the development and management of groundwater resources. Analysis of the results indicate that the central distal‐fan and mid‐fan aquifers are the best places to extract clean and safe groundwater for irrigation, and the deep aquifer (exceeding 200 m depth) has wider regions with clean and safe groundwater for irrigation than shallow aquifers. The northern and southern aquifers, with multiple hazards, limit groundwater use for irrigation. Although the proximal‐fan aquifer is a zone of groundwater recharge, the high nitrogen content seriously affects the environment and is not suitable for irrigation use. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献