Results 21 to 30 of about 11,385 (119)
Microstructure Engineering Toward High Cost‐Effective Nd–Fe–B Sintered Magnets: A Review
Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Nd–Fe–B sintered magnets, critical for enhancing electromechanical conversion efficiency and operational stability in wind turbines and electric vehicle drives, are prized for their outstanding coercivity, high remanence, and superior maximum energy product.
Dongmin Zhang +5 more
wiley +1 more source
Jingshui jishu【目的】精确预测水厂进水量是水资源规划与管理的重要基础，有助于合理分配水资源、降低生产成本，同时满足城市供水需求。本文旨在构建一个创新的混合模型，实现水厂进水量的精确预测与调度优化，提升水厂的整体运行效率并实现节能减排。【方法】本文创新性地将水动力模型与极端梯度提升(XGBoost)数据模型相结合，构建混合模型，精确预测进水量并生成梯度化的优化调度方案。混合模型在考虑水厂运行特点的基础上，对进水量进行优化处理，形成满足实际调度需求的方案，为调度人员提供科学支持。本文以Z市某水厂为例，
Zhang Xiaohong +5 more
doaj +1 more source
Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT In electrocatalysis, traditional single‐atom catalysts (SACs) face challenges in achieving coordinated control of reaction pathways due to limitations such as single local energy levels and carrier recombination. By introducing an additional defect structure, it is possible to break the electronic structure symmetry, thereby activating SACs ...
Juanjuan Huo +8 more
wiley +1 more source
四川大学学报. 自然科学版, 2002 用模拟动力学最优化方法 ,研究了在调强放射治疗 (IMRT)中角度优化的必要性 .作者在一个模拟体模上 ,采用 9,7,5和 3束照射方式 ,从不同角度共面照射 ,然后采用模拟动力学最优化方法进行调强优化计算 .在最优化计算中 ,考虑了对紧要器官的硬约束和体积约束 .在优化完成后记录下每一组参数下的目标函数、剂量体积直方图 (DVH曲线 )、强度分布和剂量分布 .通过比较不同射束角度设置下的DVH曲线表明 :在 9束照射时 ,不需进行角度优化 ;但7,5 ,3束照射时 ...
汪俊, 吴章文, 侯氢
doaj
Gaoya dianqi, 2023 气固界面电场畸变是诱发绝缘子沿面放电和降低其沿面耐电性能的重要原因，研究直流GIL绝缘子沿面电场分布调控对于提升绝缘子运行的可靠性具有重要意义。直流电压下，绝缘子沿面电场分布由其电导率分布所决定，合理地优化绝缘子表层电导率分布可以达到调控气固界面电场分布的目的。文中利用高电导涂层方法改变绝缘子表层电导率，类比现有的体介电常数优化算法，以沿面电场均匀度为优化目标，开发了表层电导率迭代优化算法，研究了迭代优化次数、涂层层数和厚度对优化后涂层电导率分布和涂层绝缘子沿面电场分布的影响。迭代优化后结果表明 ...
李宾宾 +5 more
doaj
Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Bimodal grain structure (BGS) demonstrates significant potential in synergistically optimizing the strength and plasticity of magnesium alloys. Acquiring the desired BGS consequently became a critical challenge. This study took the Mg‐9Gd‐1Zn‐0.5Zr (wt%, VZ91K) alloy as its subject. From the perspective of BGS formation mechanisms, it suggests
Shuai Yuan +5 more
wiley +1 more source
Gaoya dianqi, 2021 优化调度策略是有源配电网对分布式能源实施主动管理的核心技术,也是有源配电网安全经济运行的重要保障。文中以不同类型分布式电源的出力为控制变量,构建了突出电压质量提升和运行成本降低为目标的模糊化调度模型。引入均匀分布的初始和声库及变维数和声记忆库对基本和声搜索算法的改进用于调度模型的求解。通过IEEE33节点系统上的大量仿真测试和比较分析,验证了所建立的优化调度模型和改进算法的正确性和有效性。
段建东 +4 more
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Functional Ecology, Volume 40, Issue 7, Page 2332-2344, July 2026.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
Functional Ecology, Volume 40, Issue 7, Page 2128-2142, July 2026.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
Poverty &Public Policy, Volume 18, Issue 2, June 2026.ABSTRACT Rapid urbanisation and persistent socio‐economic inequality continue to entrench multidimensional poverty within South Africa's urban informal settlements, with women and female‐headed households experiencing disproportionate deprivation. This study analysed primary household survey data collected in 2023 from 322 households across three ...
Adrino Mazenda +3 more
wiley +1 more source