Results 71 to 80 of about 56,474 (245)
Assessment Research of Coastal Ecosystem Carrying Capacity: a Case Study in Guangxi Coastal Area [PDF]
, 2015 海岸带自然资源充足，环境条件优越，支撑着沿海地区社会经济发展。然而，海岸带由于受到来自陆域和海洋的强烈相互作用，成为了最易受到环境影响而变化的生态敏感区和脆弱性较强的生态系统。相比自然的影响，人类活动是海岸带生态系统受到的最主要干扰源。随着近年来海岸带地区人类开发活动强度的持续增加，海岸带出现了资源日渐匮乏、环境质量下降、生态风险升高等一系列问题，海岸带生态系统呈现出一定的退化趋势。开展海岸带生态系统承载力评价研究，有利于协调自然、经济、社会之间的发展关系，为制定合理的海洋发展战略提供科学依据和技术支撑。
韩宇
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Rare Metals, EarlyView.ABSTRACT Two‐dimensional (2D) nonlayered niobium nitrides have attracted considerable interest for electrochemical energy storage. However, the synthesis of these materials is hampered by their nonlayered crystal structures, which are characterized by strong three‐dimensional chemical bonding.
Rui Huo +7 more
wiley +1 more source
Guangxi Zhiwu该文报道了广西苦苣苔科报春苣苔属（Primulina Hance）一新种——平果报春苣苔（Primulina pingguoensis H. S. Ma & B. Pan），该新种在形态学上与囊筒报春苣苔（P. carinata Y. G. Wei, F. Wen & H. Z. Lü）相似，但两者能明显区别，平果报春苣苔花冠裂片狭披针形至线型，长宽比大于2（vs.圆形至卵圆形，长宽比小于1.5），花冠内部具8~10条紫色条纹，与花冠同色，无明显导蜜线（vs.棕色条纹，与花冠不同色，具两条黄色导蜜线 ...
马 虎生 +3 more
doaj +1 more source
, 2017 渤海是中国的内海,受海岸带地区人为活动的影响,海域生态环境退化严重,其主要表现为海洋生态灾害频发。本文对渤海近年典型生态灾害,如赤潮、大型藻类及水母发生的时空分布特征进行了总结,结合水环境变化,对其演变趋势进行了评估 ...
邢前国 +1 more
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Highly Anisotropic TbCo11Ti: Phase Evolution, Microstructure and Magnetic Properties
Rare Metals, EarlyView.ABSTRACT Among the 1:12‐type compounds, TbCo11Ti stands out due to its high Curie temperature and pronounced magnetocrystalline anisotropy. However, its magnetic behavior at room temperature and its phase evolution process have not been clearly established.
Wei Chen +11 more
wiley +1 more source
Shuitu Baochi Xuebao, 2023 为探究宁夏引黄灌区生态承载力和可持续发展情况,基于生态足迹法,通过生态服务价值当量对生态足迹模型中的通用均衡因子和产量因子进行本地化,定量评价引黄灌区2010—2019年不同土地利用生态承载力状况,并将生态承载力结果与通用因子计算结果进行对比分析,结果表明:(1)优化后均衡因子的 平均值为水域(11.735)＞林地(1.561)＞草地(0.901)＞耕地(0.785)＞建筑用地(0.073)＞未利用地(0.027),产量因子均值为耕地=建筑用地(1.701)＞水域(1.681)＞林地(1.680)＞草地(
郑佳乐 +4 more
doaj
Rare Metals, EarlyView.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
A study on the breeding-site fidelity of Chinese egret——based on stable carbon and nitrogen isotopic analyses [PDF]
, 2015 稳定同位素技术因具有示踪、整合和指示等多项功能，以及检测快速、结果准确等特点，近二十几年来被作为一种比较成熟的技术应用于生态学及环境科学的各个领域。例如，研究生物与环境的相关关系，检测环境污染，研究动物的食性、食物构成、营养级层次、食物链及食物网结构，动物迁徙活动，农产品溯源，食品安全等方面。同时，稳定同位素技术在动物生态学研究，尤其是鸟类生态学研究中发挥了巨大的作用，解决了很多传统方法无法解决的难题。例如鸟类食性选择、迁徙路线及中途停留地选择、繁殖地忠实度等问题上。至此 ...
于小桐
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Rare Metals, EarlyView.ABSTRACT MCrAlX coatings are widely used as bond coats in thermal barrier coating systems to protect turbine blades from high‐temperature oxidation. However, their oxidation resistance is often restricted by uncontrolled microstructures, surface roughness, and aggregation of reactive elements (REs). In this study, high‐repetition‐rate femtosecond laser
Wei Qian +7 more
wiley +1 more source