Results 11 to 20 of about 18,127 (224)
工程施工技术, 2023 文中主要讲述了振动试验的基本原理，对电动振动系统进行校准时相关参数的不确定度评定方法，主要针对频率、加速度、随机振动加速度总均方根值、随机振动加速度功率谱密度值、台面加速度幅值均匀度、台面横向振动比。
杉林 唐
semanticscholar +1 more source
工程建设, 2023 近年来，我国的工业化进程有了很大进展，对汽轮机的应用也越来越广泛。汽轮机在运行过程中的振动问题是引发汽轮机故障、降低工作效率的重要因素。为避免汽轮机振动带来的危害提高汽轮机工作效率，文中首先分析汽轮机振动原因，其次探讨汽轮机振动问题防治处理，最后就汽轮机振动防治案例分析，以供参考。
杜海 李, 昭 李
semanticscholar +1 more source
工程建设, 2023 由于大功率往复式压缩机本身特性所致，该装置会随着运行时间延长而不断加大内部气体压力及运行功率，从而使内部管道装置产生强烈的振动甚至断裂，进而引发一系列严重的安全事故。基于此，文中简单分析大功率往复式压缩机管道振动特性，并深入探讨大功率往复式压缩机管道振动控制方法，以供参考。
洪浩 关
semanticscholar +1 more source
Rare Metals, Volume 42, Issue 1, Page 234-243, January 2023., 2023 Graphical abstract Abstract The heating and helicity effects induced by circularly polarized laser excitation are entangled in the helicity‐dependent all‐optical switching (HD‐AOS), which hinders understanding the magnetization dynamics involved. Here, applying a dual‐pump laser excitation, first with a linearly polarized (LP) laser pulse followed by a
Guan‐Qi Li +9 more
wiley +1 more source
Review of Policy Research, Volume 40, Issue 1, Page 153-175, January 2023., 2023 Abstract This article studies the formation of a local Creative Placemaking (CPM) policy network based on the Advocacy Coalition Framework (ACF) and social capital perspective of policy networks. This article hypothesizes that policy beliefs, policy learning, social capital, and the perceived risks induced by defections, as well as macro‐level changes ...
Wen Guo
wiley +1 more source
Characterization of Retained Austenite in Advanced High‐Strength Steel
Scanning, Volume 2023, Issue 1, 2023., 2023 The retained austenite (RA) in advanced high‐strength steels directly affects their plasticity. It is very important for the accurate characterization of their content and types. This paper prepared three specimens with three different Mn contents (1.0%, 1.4%, and 1.7%) that are used to obtain high‐strength steel by ultrafast cooling heat treatment ...
Shouhua Li +8 more
wiley +1 more source
Antipode, Volume 54, Issue 2, Page 608-628, March 2022., 2022 Abstract Large‐scale demolition has been ubiquitous in fast urbanising China. The politics of redevelopment is often seen as secondary, derived from and defined by local entrepreneurial governance. However, changing state politics, in particular national political mandates, has not been adequately addressed. Through examining variegated practices, this
Fulong Wu, Fangzhu Zhang, Yuqi Liu
wiley +1 more source
水电科技, 2022 文章尝试用周期性振动荷载代替冲击荷载，即采用振动排水固结法处理软土。借鉴振动采油，并结合动力排水固结法。设计将一定频率的机械波通过人工震源在地面上形成波动场，传递到一定深度范围内的土体上，然后再对土层进行大面积的震动和加固，使松软的土基在波动的作用下，推进固结过程的速度更快，效率更高。在不同地区，受矿物成分、沉积条件、物理和化学等因素影响，软土的含水率、扰动程度都不一样。所以有必要对不同土样的振动排水固结特性进行试验分析。
静 胡, 成林 胡
semanticscholar +1 more source
Scanning, Volume 2022, Issue 1, 2022., 2022 Hydrogen embrittlement can easily occur in high strength martensitic steel, manifesting itself as a sudden failure or fracture without warning and greatly threatening the safety of automotive applications. Optimizing the composition of the alloy can be performed by matching heat treatment processing methods and controlling the precipitation amounts to ...
Bo Liu +8 more
wiley +1 more source
The Anatomical Record, Volume 304, Issue 11, Page 2538-2551, November 2021., 2021 Abstract This study aimed to explore the changes in functional connections between cerebral hemispheres and local brain regions functional activities in patients with acute ischemic stroke (AIS) treated with International Standard Scalp Acupuncture (ISSA).
Huacong Liu +11 more
wiley +1 more source