Results 61 to 70 of about 108,435 (188)
Visible‐Light‐Excited Optical Thermometry in Ca3Sc2Si3O12: Er3+ via an Efficient Eu2+ Bridge
Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Er3+ ions are promising for optical thermometry due to their thermally coupled levels. However, their parity‐forbidden transitions result in weak and narrowband absorption, which restricts excitation to infrared lasers (e.g., 808, 980, or 1550 nm). Moreover, the single emission center inherently limits temperature sensitivity. In this work, we
Yi Liu +6 more
wiley +1 more source
Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Because of superior transportability and high energy capacity, methanol is regarded as a potential hydrogen carrier. Photocatalytic methanol dehydrogenation offers a sustainable and cost‐effective method for releasing hydrogen. Conventional photocatalysts face challenging obstacles, including the low catalytic efficiency and rapid ...
Rundong Chen +9 more
wiley +1 more source
Gongye shui chuli, 2003 提出了纯水制备反渗透膜系统优化设计的经典模型, 导出了相应的简化模型, 描述了用现行设计软件实现优化设计的具体计算过程, 明确了系统优化结构的两个判据。在此理论与方法指导下, 得出了对应低难溶盐给水条件的膜系统最优"六支段饱和结构", 并结合浓差极化指标严格界定了低难溶盐给水的各难溶盐临界饱和度, 从而为小型反渗透膜系统的设计提供了一套完整的优化理论、优化方法与优化结构。
靖大为, 徐腊梅, 王婷
doaj
Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Biodegradable zinc (Zn)‐based materials are considered promising candidates for orthopedic applications because of their favorable mechanical properties, controllable biodegradability, and good biosafety profiles. However, their clinical translation is limited by early‐stage corrosion‐induced cytotoxicity and inflammation, as well as ...
Jinlong Mao +9 more
wiley +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
Shiyou jixie, 2014 为使煤层气排采生命周期更长、煤层气产出量最大化，对地面直驱螺杆泵在煤层气排采中的生产参数进行了优化研究。综合考虑煤层气排采制度及井、泵之间的供排协调的实际约束条件，建立以生命周期内煤层气产气量最大为优化目标的数学模型。引入煤层气井生产数值模拟结果，将其作为优化过程中的参数，将煤层气井生产排采制度这一较难表征的约束条件恰当转化，以适当的时间段内压降值作为计算排水量的依据，编制优化流程图，按照优化流程及其他各约束条件对生产参数进行优化。通过具体实例验证了优化方法的有效性。
孙艳萍, 赵, 宁, 屈文涛, 刘, 庆
doaj
Gaoya dianqi, 2022 针对因真空断路器大电流故障开断过程中灭弧室断口场域磁感应强度弱，导致磁场对电弧等离子体有效控制力减弱的问题，将NSPSO多目标优化方法与磁场有限元分析相结合，以12 kV/1 250 A/31.5 kA典型技术参数的中压真空断路器灭弧室纵磁触头系统为对象进行结构优化设计，以触头片开槽长度、斜槽深度、触头片开槽偏转角、触头杯座厚度为优化设计变量，以灭弧室断口中心截面纵磁最大值与磁场有效作用面积同时达到最大值为优化设计目标，求得Pareto前沿非支配优化解集 ...
臧谦 +6 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
Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Biodegradable Zn‐based alloys are promising candidates for temporary implants, yet excessive Zn2+ release during degradation may induce cytotoxicity and adverse tissue responses. In this study, Zn‐xBa alloys (x = 0.1 wt%, 0.5 wt%, 1.0 wt% and 3.0 wt%) were developed to achieve controlled corrosion behaviors with improved biocompatibility.
Liu‐Dang Fang +9 more
wiley +1 more source
Zhendong Ceshi yu Zhenduan面向组合式新概念飞行器领域的发展需要，提出了一种固定销式单体机翼的组合式飞行器设计方案，采用尺寸参数优化和稳健性拓扑优化方法，研究了在外载荷作用位置非确定条件下，单体机翼承力结构的最优构型设计。首先，建立单体机翼结构有限元模型，基于Navier‑Stokes方程和尺寸参数优化方法，分析了气动载荷下连接固定销的最优布局，固定销最大局部应力降低了6.30%；其次，采用变密度法对单体机翼进行稳健性拓扑优化，对优化结果进行参数化模型重构；最后，通过二次尺寸优化，完善了单体机翼最优承力结构设计 ...
doaj +1 more source