Results 41 to 50 of about 12,492 (169)

Interfacial Electronic Interactions in Hierarchical Heterostructure Electrocatalyst for Energy‐Saving Hydrogen Production at Industrial Current Densities

open access: yesRare Metals, Volume 45, Issue 2, February 2026.
ABSTRACT Developing low‐energy‐input electrocatalytic systems for efficient hydrogen production is crucial for advancing sustainable energy technologies. The overall hydrazine splitting (OHzS) has emerged as a promising strategy to reduce the overall energy consumption by replacing the sluggish oxygen evolution reaction.
Haozhou Chen   +13 more
wiley   +1 more source

等离子体反应器流场、温度场和浓度场的参数研究 [PDF]

open access: yes, 1987
文献[3,4]表述了描述等离子CVD化学反应器流场的数学物理模型,并利用Patankar方法对冷热流场作了求解。本文在此基础上就影响反应器流场、温度场和浓度场的有关参数作了理论研究。所研究的问题有:冷热流场的差别,喷射环缝密度和主流旋转速度对流动的影响。所得结果清楚地表明:这些参数的选择对反应器的性能有着不同程度的影响 ...
朱清文, 赵国英
core  

伊塞克湖典型小流域径流变化差异性及其影响因素分析

open access: yesShuitu Baochi Xuebao, 2020
基于伊塞克湖流域近70年来气温、降水和径流量资料,采用Mann—Kendall法、突变检验和小波分析进行研究流域气温、降水和径流量的变化特征及差异性,在此基础上,探讨区域气候变化对径流量的影响。结果表明:(1)1951—2012年伊塞克湖典型小流域气温呈上升的趋势;其中,乔尔蓬-阿塔站(湖盆中部)和克孜尔苏站(东部)气温分别在1975年和1989年后上升趋势增大,秋季增温幅度均对气温升高的贡献较大;2个水文站降水量变化相对复杂,整体呈增加趋势,秋季降水量增加幅度最大。(2)受气温升高和降水量的直接影响 ...
伊丽努尔   +3 more
doaj  

Advancing Water Security in the Tropical and Subtropical Regions: An Integrative Topic Modeling Approach

open access: yesWorld Water Policy, Volume 12, Issue 1, February 2026.
ABSTRACT Water security in tropical regions faces escalating pressures from climate change, land‐use shifts, and population growth. We conducted a bibliometric review of 1146 peer‐reviewed articles (1964–2023) on tropical water security. Latent Dirichlet Allocation identified 13 thematic topics and their evolution. Publications rose sharply after 2012,
Karling Fernanda Schuster   +3 more
wiley   +1 more source

Optimal control of multi-zone vav air-conditioning system [PDF]

open access: yes, 2017
2006-2007 > Academic research: refereed > Publication in refereed journalVersion of ...
Wang, SW, Xu, XH
core  

基于Fluent软件的二次开发计算气举阀流量

open access: yesShiyou jixie, 2012
气举采油作业中,气举阀流量与采油效率、成本紧密相关,是确定采油工艺的关键因素,因此了解其流量特性十分必要。气举阀可伸缩的阀杆总成与阀腔内气体流场的交互作用,使其流量不仅与进出口压力相关,而且与阀杆行程相关,这样的流量求解问题具有流固耦合特性,采用单纯的固体力学方法或流体力学方法均难以求解。通过对Fluent软件开放的用户自定义函数UDF的二次开发,研究出在任意进、出口压力条件下气举阀流量的计算方法。该方法应用于某型号1 in气举阀,得到合理的阀杆行程,重现了气举阀的“流量堵塞”现象 ...
王言聿   +3 more
doaj  

自能式SF6断路器开断过程中阀连续运动特性的仿真分析

open access: yesGaoya dianqi, 2021
自能式SF6断路器单向阀、回气阀和泄压阀的运动与气流场之间存在着复杂的相互作用。基于3个阀的实际运动规律,利用牛顿第二定律,建立阀连续运动的数学模型,同时基于二维轴对称电弧磁流体动力学(MHD)模型并结合真实气体物性参数,对自能式SF6断路器在大电流燃弧阶段的气流场及阀的连续运动进行仿真分析。研究表明:电弧燃烧产生的热气回流是热膨胀室内产生高压和单向阀关闭的主要原因;不同监测点上气体压力变化与燃弧电流、静弧触头位置和阀所处状态密切相关;单向阀的动作受燃弧电流和热膨胀室压力大小影响 ...
赵伟涛   +4 more
doaj  

Experimental methods for wind tunnel studies of seed dispersal by wind

open access: yesApplications in Plant Sciences, Volume 14, Issue 1, January-February 2026.
Abstract The complexity and variability of natural environments make quantitative studies of seed wind dispersal challenging. Wind tunnel experiments offer a controlled alternative to investigate the mechanisms of seed wind dispersal. This review focuses on wind tunnels and the associated technologies used for studying seed wind dispersal, including ...
Liang Tian   +5 more
wiley   +1 more source

Application Research of Photochemical Vapor Generation and Inductively Coupled Plasma Mass Spectrometry [PDF]

open access: yes, 2015
本论文建立了光化学蒸汽发生(PCVG)-电感耦合等离子体质谱(ICPMS)联用技术同时测定钴(Co)、砷(As)、锑(Sb)、硒(Se)、碲(Te)等五种元素及直接测定八种As和Se形态的方法。建立的在线分离测定方法具有快速和准确的特点,为Co、As、Sb、Se和Te的同时测定及As和Se形态的直接测定提供了新的技术手段。本论文分为4章,具体内容如下: 第1章介绍了环境中Co、As、Sb、Se、Te和不同As、Se形态的理化性质及危害,并对上述元素常用的分析测定方法和研究进展进行了概述 ...
朱建颖
core  

Atomic Synergy of Vacancy‐Engineered Layered Double Hydroxide/Heteroatom‐Doped Carbon Quantum Dots for Bifunctional Oxygen Electrocatalysis in Zn–Air Batteries

open access: yesRare Metals, Volume 45, Issue 1, January 2026.
ABSTRACT Low conductivity and poor oxygen reduction reaction (ORR) catalytic activity limit the bifunctional catalytic performance of layered double hydroxide (LDH) in zinc–air batteries. In this work, an efficient bifunctional electrocatalyst was prepared by loading nitrogen and phosphorus co‐doped carbon quantum dots (NPCQDs) onto a cationic‐vacancy ...
Wenhao Tang   +4 more
wiley   +1 more source

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