Results 1 to 10 of about 561,838 (163)

Planning coordination of rural tourism and village renovation—a case of Aigrette Vale in Huzhou City(乡村旅游开发与农村居民点整治的规划协调对策研究——湖州市白鹭谷案例)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2008
乡村旅游开发过程往往涉及到农村居民点整治问题,两者的规划协调对促进乡村旅游与新农村建设具有重要意义.以湖州市白鹭谷旅游开发与农村居民点整治规划为例,剖析了两者在规划协调中存在的问题,构建了两者协调发展框架,并从土地功能适宜性分区、村落-旅游体系有机聚合、延续乡村景现意境、社区参与、生态环境分级控制保护、联动合作机制与渐进开发等六个方面提出了具体对策.
WANGWei-wu(王伟武)   +2 more
doaj   +1 more source

风电集群接入柔直互联多区域协同调频策略 [PDF]

open access: yes全球能源互联网, 2019
由于柔直电网“隔离”了频率信号,互联多区域协同调频问题亟待研究。现有研究大多利用换流站的下垂控制以及直流电压偏差实现频率信号的传递,但忽略了风电集群接入后由风电功率正常波动引起的直流电压偏差干扰,可能导致风电集群在无需调频时频繁地调整出力。对此,提出了基于直流电压偏差及其特征量的多区域协同调频策略,分别针对电网频率偏移和风电功率波动两种场景提取直流电压偏差特征量,包含电压变化量、电压变化率和滤波后的电压分量幅值3个特征,并基于二者的差异设置换流站启动下垂控制的判据。仿真结果验证了所提方法的有效性。
崔阳   +5 more
doaj   +1 more source

Leaf C:P ratio as a universal indicator of photosynthesis in subtropical woody species: Stoichiometric thresholds and metabolic trade‐offs

open access: yesFunctional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract The stoichiometric ratios of carbon (C), nitrogen (N) and phosphorus (P) serve as important indicators for assessing nutrient balance in forest ecosystems, but their relationships with photosynthetic dynamics require deeper characterization.
Minghao Chen   +9 more
wiley   +1 more source

Land use overrides climatic controls on soil organic nitrogen transformations: Contrasting responsiveness between forest and cropland ecosystems

open access: yesFunctional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Soil organic nitrogen (SON) transformation is critical for global nutrient cycling and ecosystem productivity, yet how its responsiveness to climate change differs across diverse land use types remains poorly resolved.
Xinyi Yang   +10 more
wiley   +1 more source

Organ‐specific ozone and nitrogen legacies strengthen substrate control over litter decomposition

open access: yesFunctional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Elevated tropospheric ozone (O3) and nitrogen (N) deposition are concurrent atmospheric changes that strongly influence terrestrial carbon cycling, yet their combined effects on below‐ground decomposition remain poorly understood.
Xiaofan Hou   +8 more
wiley   +1 more source

Dehydrogenation Thermodynamic and Kinetic Challenges of Mg‐Ni‐Based Alloy Hydrides

open access: yesRare Metals, Volume 45, Issue 6, June 2026.
ABSTRACT Solid‐state hydrogen storage stands as a pivotal, safe, and efficient solution for the future hydrogen economy. Among diverse hydrogen storage systems, Mg‐Ni‐based alloy hydrides are recognized as cornerstone materials. However, their practical application is hindered by two core challenges: the high thermodynamic stability of the hydride ...
Jinglan He   +6 more
wiley   +1 more source

Super‐High Coercivity Sintered NdFeB Magnets Enabled by High‐Rate Dy/Tb Grain Boundary Synergistic Diffusion

open access: yesRare Metals, Volume 45, Issue 6, June 2026.
ABSTRACT The surging demand for high‐performance NdFeB magnets has made it essential to achieve ultrahigh coercivity while minimizing the consumption of heavy rare earths. To tackle this challenge, this study proposes a Dy/Tb bilayer grain boundary diffusion strategy and systematically investigates the co‐diffusion behavior of Dy and Tb.
Rui Chang   +7 more
wiley   +1 more source

风电场参与电网一次调频最优方案选择与风储协调控制策略研究 [PDF]

open access: yes全球能源互联网, 2019
研究了大型风电场联合集中式储能系统参与电网一次调频的可行性与经济性,并提出一种风储联合调频控制策略。统计分析了正常运行与发生功率缺额事件下实际电网的频率特性,仿真验证了新能源机组参与电网一次调频的必要性;类比火电机组一次调频原理,提出了新能源机组参与一次调频的基本条件;分析了风电机组基于转子惯量、预留备用和配置储能3种调频方案的技术经济性,指出风电场装配集中式储能以承担一次调频是更为经济有效的调频方案。旨在充分利用风机转子惯量以减少配置储能容量,提出一种风储协调的调频控制策略,有效减少储能容量。
刘辉   +4 more
doaj   +1 more source

3D Printed High‐Strength Hydrogel for Dual Release of Cu2+ and Ag+ Ions to Enhance Bone Repair and Antibacterial Properties

open access: yesRare Metals, Volume 45, Issue 6, June 2026.
ABSTRACT Bone restoration is often hindered by the spatiotemporal dysregulation of immune and regenerative signals. Conventional bio‐inert implants, providing only passive support, fail to modulate this microenvironment, leading to infections and poor healing.
Zhizhong Sun   +8 more
wiley   +1 more source

基于新能源发电的构网型协调储能控制策略研究

open access: yesGaoya dianqi, 2023
中国正加速构建以新能源为主体的新型电力系统,其在缺少同步机后,没有了阻尼和惯性支撑,会导致系统稳定性下降,因此构网型控制技术(GFM)应运而生。在此基础上基于新能源发电的构网型控制需要某种形式的能量存储与发电装置耦合。此时储能系统(ESS)可在变流器的直流侧或交流侧耦合接入。文中提出了一种基于新能源发电的构网型协调储能控制策略,该策略允许安装在变流器交流侧的ESS具有与安装在变流器直流侧获得的相同的特性和动态行为。此外,所提出的控制还可以协调储能保证系统在新能源不能正常发电时 ...
郑云平   +3 more
doaj  

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