Results 11 to 20 of about 12,979 (200)

Photometric calibration of the Stellar Abundance and Galactic Evolution Survey (SAGES): Nanshan One-meter Wide-field Telescope g, r, and i band imaging data

open access: yes, 2023
In this paper, a total of approximately 2.6 million dwarfs were constructed as standard stars, with an accuracy of about 0.01-0.02 mag for each band, by combining spectroscopic data from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope Data ...
Ali, Esamdin   +18 more
core   +1 more source

The Research on Wind-induced Vibration Control of Large Span Roof Structures with Different Damping Systems and Optimization of MTMD Damping System [PDF]

open access: yes, 2016
近年来,随着国内经济实力的增强和社会发展的需要,大跨空间结构在我国得到迅速发展,且跨度越来越大。由于大跨空间结构具有质量轻、阻尼小、柔性大、自振频率低等特点,因而对风荷载的作用很敏感。在风荷载的作用下,结构会产生较大的变形,严重降低结构的安全性和舒适性。为抑制结构的动力响应,学者们提出在结构适当位置处安装控制装置的概念。目前,高层建筑在风荷载作用下的振动控制研究已取得丰硕成果,并有大量的工程应用实例。然而,国内外学者对大跨空间结构的风振控制研究相对较少,因此有必要开展大跨空间结构的风振控制研究 ...
邵辉
core  

Urbanization and Seasonality Increase Introduced Plant Consumption by the World's Southernmost Parrot 城市化与季节性增加了全球最南端鹦鹉对引入植物的取食

open access: yesIntegrative Conservation, EarlyView.
Urbanization may alter bird foraging. Austral Parakeets (Enicognathus ferrugineus) in Patagonia rely on introduced plants in urban areas, especially in winter, despite preferring natives in the wild. This seasonal reliance on introduced species highlights urbanization trade‐offs and underscores the need to manage green areas with native plants to ...
Rocío Bahía   +2 more
wiley   +1 more source

Simulation and Prediction of Xiamen Urban Expansion Based on A Coupling Relationship Between Land Use and Transportation [PDF]

open access: yes, 2016
在经济新常态和新型城镇化战略不断推进的时代背景下,中国城市空间结构发展模式的转型已势在必行。在经历了长期的外延式城市空间快速扩张之后,人口和资源环境的矛盾、建设用地的紧张、交通供给与需求的脱节等成为我国城市空间发展中一系列不容回避的问题,城市空间由外延式扩张向内涵式提升的转型已经迫在眉睫。厦门市可建设用地的稀缺将对城市规模的扩张构成直接限制,但同时,在过去几十年的快速城市化进程中,由于缺乏对城市空间政策和公共投资的有效整合,城市空间增长有明显的分散化迹象 ...
周玉
core  

Sun Bear Ecology and Conservation: Multiscale Habitat Associations in Southeast Asia 马来熊的生态与保护:东南亚地区的多尺度生境关联研究

open access: yesIntegrative Conservation, EarlyView.
We collated detections of the sun bear from new and previously published camera trap studies across its range. We then analysed these detections at two different spatial scales to assess the habitat associations and diel activity of this species. We found that the sun bear is tolerant to moderate habitat disturbances. ABSTRACT Degraded tropical forests,
Alexander Hendry   +5 more
wiley   +1 more source

Research on the spatial topological structure of Tourism traffic——take Xiamen city as an example [PDF]

open access: yes, 2015
交通作为旅游产业发展的基础条件,一直是学者研究的重点。纵观旅游业发展史,每一次的历史性发展无不与交通技术进步紧密相关,交通布局合理与否直接关系到旅游产业的发展程度。厦门作为国际知名的海上花园城市,是我国著名的滨海旅游城市,也是东南沿海重要的交通枢纽,但也深受福建交通发展的制约。 交通系统作为一个复杂的系统,不同的结构体系呈现出不同的交通运输力。旅游交通既依附于大的交通体系,又有其特殊性,日常交通结构分析的方法无法简单系统、直观地反映出整个旅游交通网络结构体系的空间特征。因此 ...
陈秋莹
core  

Justice in coexistence: Pastoralism and large carnivores on the Qinghai‐Tibet Plateau

open access: yesPeople and Nature, EarlyView.
Abstract The conflict between livestock husbandry and large carnivore conservation presents significant challenges in grassland ecosystems worldwide. Achieving sustainable coexistence among herders, livestock and large carnivores requires reconciling diverse perspectives and interests through equitable, inclusive and fair processes that address both ...
Yufang Gao, Yue Yu
wiley   +1 more source

Research on The Choice of Rail Transit's Route Scheme of The Third Line in X City [PDF]

open access: yes, 2016
轨道交通在国内发展非常迅速,很多城市在积极规划或扩建中。同时在持续快速城镇化的冲击时,我国很多城市在市级中心以外建立起了多个城市副中心,轨道交通线网串联起这些中心,承载着引导城市空间形态由高强度“单中心”向功能相互渗透的“多中心”空间结构转变。但面临在一个城市已经修建了既有骨架地铁线路穿越市级中心后,需要再次修建地铁线路时,其线路走向是采用中心到副中心方案还是副中心连接副中心方案的问题。 本人针对上述问题,以X市轨道交通第三条地铁线为研究对象,针对第三条地铁线两个备选方案的特点 ...
沈峰
core  

Internal physiological drivers of leaf development in trees: Understanding the relationship between non‐structural carbohydrates and leaf phenology

open access: yesFunctional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Plant phenology is crucial for understanding plant growth and climate feedback. It affects canopy structure, surface albedo, and carbon and water fluxes. While the influence of environmental factors on phenology is well‐documented, the role of plant intrinsic factors ...
Yunpeng Luo   +8 more
wiley   +1 more source

Industrial Upgrade Effects of Product Space Dynamic Evolution——in Case of China [PDF]

open access: yes, 2016
保持一国经济持续发展,提高国民收入水平,是经济学界所关注的重要课题。现有的比较优势理论认为,发展中国家可以通过充分发挥其比较优势,实现专业化生产,依靠产业分工和专业化经济,推动要素禀赋的内生转换,从而实现国家生产技术结构的升级和调整,内生地达到产业结构升级、高级化、合理化,推动经济的持续增长。但是“中等收入陷阱”现象对该理论的合理性和科学性提出了挑战,为什么光靠比较优势实现的专业化生产,无法实现内生的产业结构升级和持续的经济发展?显而易见,在解释和回答这个现实经济问题方面 ...
任天翔
core  

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