Results 11 to 20 of about 78,947 (114)

轻负荷磁头的气动特性

open access: yes, 1987
本文采用数值方法求解修正雷诺方程,给出轻负荷、小间隙浮动块的气膜压强分布,飞升曲线以及浮动块几何尺寸、负荷 ...
王春海, 傅仙罗
core   +2 more sources

Phosphorus‐Doping Drives the Formation of a Pt‐Skin@PtFe Alloy Catalyst With Modulated d‐Band Center for Oxygen Reduction

open access: yesRare Metals, Volume 45, Issue 3, March 2026.
ABSTRACT Platinum (Pt)‐based catalysts are crucial for the commercialization of hydrogen/metal air batteries, but they suffer from Pt scarcity, high cost, and nanoparticle dissolution/agglomeration, mainly leading to performance degradation. We address this by synthesizing a PtFe alloy catalyst (PtFe–PA–NC) via a phytic acid (PA) assisted pyrolysis ...
Chenyang Shu   +9 more
wiley   +1 more source

Nitrogen‐transforming microorganisms potentially facilitate the invasion of Moso bamboo (Phyllostachys edulis) into evergreen broadleaf forests

open access: yesFunctional Ecology, Volume 39, Issue 10, Page 2704-2716, October 2025.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Moso bamboo (Phyllostachys edulis) invasions into broadleaf forests can cause serious ecological problems, such as reducing biodiversity and disrupting community succession.
Ting Zhou   +5 more
wiley   +1 more source

Guanotrophy: Waterbirds Pay for Using Resources at Their Wintering Habitats 鸟粪营养学 :水鸟在越冬栖息地使用资源后留下回报

open access: yesIntegrative Conservation, Volume 3, Issue 4, Page 382-397, December 2024.
Significant waterbird colonisation was recorded in the wintering period (October through March in 2018–2019 and 2019–2020) in wetlands on Central Asian and East Australasian Flyways. Different limnochemical conditions influenced nitrate and phosphate concentrations.
Arkajyoti Mukherjee   +3 more
wiley   +1 more source

海水盐度对短程硝化反硝化的影响

open access: yesGongye shui chuli, 2003
采用SBR工艺研究了海水盐度对短程硝化反硝化影响,同时研究了不同海水盐度下,温度、pH、氨氮负荷对氨氮去除率的影响。试验结果表明:大生活用水范围内(海水占生活用水的比例在35%以内)的海水盐度情况下仍能实现短程硝化反硝化,但不同海水盐度情况下的氨氮去除率与氨氮负荷有关,随着海水占生活污水比例的增加氨氮负荷应逐渐减少。当短程硝化系统的单位MLSS氨氮负荷小于0.15kg/(kg·d)时,氨氮去除率仍可达到90%以上。升高温度有利于提高短程硝化脱氮效率,反应温度应保持在25~30℃。
于德爽   +3 more
doaj   +2 more sources

两级BAF处理高浓度尿素废水影响因素研究

open access: yesGongye shui chuli, 2010
采用两级BAF处理某石化厂高浓度冷凝液废水,考察了尿素容积负荷、氨氮容积负荷、pH及滤床高度对两级BAF去除尿素效果的影响。结果表明,BAF处理高浓度尿素废水可行,当进水平均尿素容积负荷、氨氮负荷分别为6.92、0~3 kg/(m3·d),pH为7.0~11.0时,两级BAF对尿素的去除率<85%。
任源, 闫立龙, 马放
doaj   +2 more sources

心理负荷概念之概述

open access: yes, 1988
随着人-机系统的复杂化,心理负荷的问题越来越引起人们的注意。影响心理负荷的因素有:(1)任务变量。包括任务目标和要求,以及任务结构。(2)环境变量。包括物理环境和社会环境。前者如海下,高空或空间、气候(温度、湿度、空气质量等),工作场地安排,噪音和照明,以及来自自然或人造的危险程度。(3)操作者变量。包括操作者资格、能力,操作者对任务要求的如觉,操作者的行为,操作者所体验到的工作负荷。(4 ...
方俐洛
core   +1 more source

一种气缸盖激光热负荷试验方法

open access: yes, 2015
本发明公开了一种气缸盖激光热负荷试验方法,此方法采用光束整形器将原始激光束整形为具有特定光强分布的非均匀光束,将此非均匀光束加载到气缸盖火力面上,能够模拟实际工况下气缸盖火力面的整体温度分布情况,借助冷却装置及测温系统可开展激光热负荷试验。此方法和规范具有成本低、效率高 ...
郑彩云   +4 more
core   +2 more sources

垃圾渗滤液难降解有机物与氮同步去除影响因素

open access: yesGongye shui chuli, 2015
针对中老龄垃圾渗滤液中难降解有机物与高氨氮去除的难题, 提出了难降解有机物与硝酸盐氮的同步降解技术。通过试验考察了硝氮负荷、温度、pH及营养物质投加量等因素对系统去除效能的影响。结果表明, 硝氮负荷、进水pH、温度及营养物质投加量对系统处理效能的影响显著, 当pH为6.5~7.5, 温度为30 ℃, 硝氮负荷为0.08kg/(m3·d)时, 系统状况最佳。
刘思云   +4 more
doaj   +2 more sources

氨氮负荷对垃圾渗滤液与城镇污水协同处理效能影响研究

open access: yesGongye shui chuli, 2015
以掺入比作为垃圾渗滤液与城镇污水协同处理掺入量控制指标, 不能反映渗滤液水质变化, 导致出现协同处理不达标的问题。采用SBBR工艺, 以老龄化垃圾渗滤液与城镇生活污水为对象, 研究以进水氨氮负荷作为协同处理垃圾渗滤液掺入量的控制指标。结果表明, 氨氮负荷对协同处理效果影响显著, 当协同处理氨氮负荷为0.24 kg/(m3·d)时, 出水COD、NH4+-N和TN均达到《城镇污水处理厂污染物排放标准》的一级A标准。以氨氮负荷为0.24~0.4 kg/(m3·d)控制老龄化渗滤液掺入量较适宜。
刘佳东   +4 more
doaj   +2 more sources

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