Results 41 to 50 of about 5,603 (160)
A Study of Spatial-Temporal Difference and Spatial Effect of Pan-Yangtze River Delta’s Tourism Economy——A Spatial Econometrics Perspective [PDF]
, 2016 由于我国区域间社会经济发展水平、基础设施条件、旅游资源禀赋、旅游服务水平等方面的差异，不同地区间旅游经济的发展会呈现不同的时空特征。同时在经济活动外部性的作用下，区域旅游经济发展也存在着某种程度的溢出效应。国内学者在对我国区域旅游经济发展差异的研究中，研究尺度多集中在省域范围，对旅游经济发展空间效应的研究还有待丰富。本文拟探究区域旅游经济发展时空差异特征及其空间效应，并根据实证结果提出对策建议，促进地区间旅游经济协调发展，形成相互联动、互利共赢的区域旅游发展格局 ...
冷翔
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Integrative Conservation, Volume 5, Issue 1, Page 137-149, March 2026.Pometia pinnata demonstrated life‐stage‐specific genetic responses to landscape features, with asymmetric gene flow patterns and population recovery following historical bottlenecks, revealing complex topographic and demographic influences on forest genetic structure.
Madhuparna Chatterjee +5 more
wiley +1 more source
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT High‐power piezoelectric ceramics which have a wide operating temperature range are essential for sensor and actuator applications in extreme conditions. However, their development is fundamentally hindered by the inherent trade‐off among key parameters (TC, d33, Qm).
Rui Yan +10 more
wiley +1 more source
Ultrasound in Obstetrics &Gynecology, Volume 67, Issue 3, Page 272-282, March 2026.ABSTRACT Objective Complete hydatidiform mole and coexisting normal fetus (CHMCF) is a rare condition for which there is significant heterogeneity in diagnosis, counseling and management of complications. The objective of this study was to summarize the prevalence of clinical outcomes in reported cases of CHMCF.
N. Salmeri +8 more
wiley +1 more source
Shuitu Baochi Xuebao, 2007 采用地统计学的方法,研究了江西泰和退化红壤区不同模式重建森林在高温干旱季节土壤水分空间变异规律及其分布格局。结果表明,在该研究尺度下,湿地松纯林、枫香纯林、湿地松与枫香混交林0~20 cm,20~40cm土层含水量分布都符合正态分布,都可较好地拟合成球状模型,表现出明显的空间相关性和空间分布格局。3种重建模式样地0~20 cm,20~40 cm层土壤含水量变异函数的基台值、变程都较无林荒地明显增大,而且基台值和变程在0~20 cm,20~40 cm两土层间的差异明显大于无林荒地,说明植被恢复以后 ...
杜志勇 +3 more
doaj +2 more sources
野生动物学报, 2023 为了解全球海蛇（Hydrophiinae）的地理分布格局对陆上温度的响应，进一步研究其生存环境与分布丰度模式的关系。从GBIF网站收集全球71种海蛇地理分布信息，划分全球海蛇的高中低丰度区，并划分海蛇的“广布种”和“特有种”，用GIS技术建立物种丰富度模式，获取气候变量数据，对分布丰度和陆上温度生态位宽度进行统计分析。结果显示：有8个区域可被定义为“高丰度区”，22种海蛇可被定义为“广布种”。在高丰度区，部分海蛇加宽陆上温度生态位，部分则收窄生态位；1个物种的局部陆上温度生态位存在地理变异 ...
王湘君 +4 more
doaj
The Relationship of Environmental Factors with Community Structures and Diversities of Microorganisms in Activated Sludge from Wastewater Treatment Plants [PDF]
, 2013 随着我国社会经济的飞速发展和城镇化进程的加快，大量肆意排放的废水造成水体严重污染，导致“水危机”日趋严重。废水在排入水体前，应首先由污水处理厂进行处理。较之于增加污水处理厂数量需要耗费大量资金成本，提高现有污水处理设施的废水处理效率至关重要。活性污泥法是污水处理厂应用最广泛的废水处理方式之一。由于在活性污泥系统中，微生物是去除污染物的主体。因此，深入了解活性污泥中微生物的群落结构与功能，理解其时空分布格局及受控机理，对于深化认识污水处理系统的本质，进而提高污水处理效率具有重要意义。此外 ...
杨晓永
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Functional Ecology, Volume 40, Issue 3, Page 636-654, March 2026.Read the free Plain Language Summary for this article on the Journal blog. Abstract The nested subset pattern (nestedness) has been widely used to explain species distributions in island and fragmented systems. Mountain sky islands serve as critical natural laboratories for understanding the evolutionary consequences of geographic isolation and climate
Caiwen Zhang +5 more
wiley +1 more source
Design and Implementation of Online Environmental Monitoring System Based on B/S [PDF]
, 2015 随着社会经济的快速发展和人类生活水平的逐步改善，人类在创造所需物质文明的同时，环境污染和生态破坏也在日益加重。传统的环境监测系统缺乏长时间的、具有代表性的监测数据，无法适应长期有效管理机制的需求，所以需要一种远程的在线环境监测系统。随着计算机网络技术的快速发展，建立一套自动化的环境在线自动监测系统，是环境监测发展的一个必然趋势。它能及时反映环境质量，实时跟踪污染源的变化，能准确预测各种突发环境事件。 针对传统监测方法的缺陷，本文基于B/S架构进行在线环境监测，利用GIS、ArcGISServer ...
刘兰兰
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Genetic origins and climate‐induced erosion in economically important Asian walnuts
Conservation Biology, Volume 40, Issue 1, February 2026.Abstract The global climate is undergoing unprecedented changes, posing significant threats to species persistence. However, the spatiotemporal impacts on genetic diversity remain poorly understood, hindering species conservation and management. Walnuts, generally referred to as Juglans regia and J. sigillata, are economically vital in Asia, but little
Peng‐Zhen Fan +17 more
wiley +1 more source