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流体-固体相互作用、碰撞和起飞的建模

Acta Mechanica Sinica 2023年第5期39卷 1-12页

作者： Frank T.Smith Ellen M.Jolley Ryan a.palmer Department of Mathematics University College LondonLondonUK School of Biological Sciences University of BristolBristolEngland School of Mathematics University of BristolBristolEngland

本文是流体-固体相互作用机制方面的最新进展综述,主要研究固体物体自身的运动与其周围流体运动之间的相互影响.非稳态相互作用的数学模型是对两个空间维度和时间尺度的内部通道和外部近壁流的描述.本文重点描述伴随计算量减少的分析发... 详细信息

本文是流体-固体相互作用机制方面的最新进展综述,主要研究固体物体自身的运动与其周围流体运动之间的相互影响.非稳态相互作用的数学模型是对两个空间维度和时间尺度的内部通道和外部近壁流的描述.本文重点描述伴随计算量减少的分析发展过程.文章讨论无黏性流中掠过和下沉、物体的起飞、飞离或弹跳,以及黏性效应,特别是黏性和无黏性之间的相互作用和影响.主要研究结果涉及撞击时间、起飞条件、撞击和飞离之间的边界、主要参数及其范围以及物体形状和质量对物理及力学机制的影响.

关键词： Fluid-body interactions Skimming Impacts Analysis

Salicylic acid-mediated plant defense： Recent developments, missing links, and future outlook

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Frontiers in Biology 2017年第4期12卷 258-270页

作者： ian Arthur palmer Zhenhua Shang Zheng Qing Fu University of South Carolina Department of Biological Sciences University of South Carolina Columbia SC 29208 USA

BACKGROUND： Plant pathogens are responsible for many of history＇s greatest famines. Understanding how plants defend themselves against pathogens is crucial to preventing future famines. Salicylic acid （SA）-mediated plant defense is a key defense pathway, which plants use to defend against biotrophic and hemi-biotrophic pathogens. As a master regulator of SA- mediated plant defense, NPR1 interacts with TGA and WRKY transcription factor families, individual members of which positively or negatively regulate plant defense. OBJECTIVE： In this review we describe the recent developments and predict future directions of research on the involvement of circadian rhythm-, autophagy-, and viral RNA silencing-related genes in SA-mediated plant defense on SA, on plant defense, the induction effects of PR proteins, and the mechanisms by which NPR1 regulates defense-related genes. METHODS： We performed an extensive search of current and past literature using the PubMed, Google Scholar, and Google search engines. Our search terms included：＂SA-mediated plant defense,＂ and ＂NPR1 [AND] salicylic acid.＂ Other search terms, wildcards, and Boolean operators were paired with ＂NPRI＂ or ＂plant defense＂ as needed to research more detailed information related to specific topics covered within this review. We also used Google to search for, ＂economic impact citrus greening,＂＂aspirin,＂＂Irish potato famine,＂ and ＂rice blast,＂ among other terms, to gather background information on the history and impact of plant diseases, and the historical use of aspirin. RESULTS： Of 148 sources found, 132 were directly related to plant defense. The remaining sources are related to the historical and economic impact of plant diseases and the historical use and mechanism of action of aspirin or salicylate. All reviewed sources have been documented in the references section. CONCLUSION： The topic of salicylic acid-mediated plant defense is broad, and new research is expanding our understanding of this topic qui

关键词： salicylic acid plant defense SA-mediated defense

21世纪的环境教育理论、实践、进展与前景第1版

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Shifting Daoist Ritual Practices,Specialists and Practitioners in Hong Kong

丛书名：基础教育改革与发展译丛

2002年

作者：（英）Joy a.palmer 田青刘丰译

本书包括：环境教育的历史与进展、全球议程、关于环境教育理论和研究的展望、环境教育的全球纵览、21世纪环境教育的发展与前景等内容。

ISBN: (数字)7501935955

ISBN: (纸本)7501935955

本书包括：环境教育的历史与进展、全球议程、关于环境教育理论和研究的展望、环境教育的全球纵览、21世纪环境教育的发展与前景等内容。

关键词：文化、科学、教育、体育

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宗教人类学 2014年第1期 496-501页

作者：宗树人香港大学社会学系

This set of four articles,focusing on cases in Hong Kong,offer rich materials for studying the evolution of ritual practices in Chinese religion,within a local social *** on Daoism and Chinese religion has identified ... 详细信息

关键词：香港宗教中国发展现状

Competition Creates Deep Space Cuisine

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Engineering 2024年第9期40卷 4-7页

作者： Chris palmer Senior Technology Writer

For decades,meals for astronauts during their trips off planet have mostly consisted of prepackaged dehydrated or freeze-dried food,occasionally garnished with terrarium-grown lettuce(Fig.1)[1,2].With longer-term missions to extraterrestrial outposts on the near horizon,a US National Aeronautics and Space Agency(NASA)competition now in its final stages aims to meet the nutritional needs of astronauts on deep space *** added benefit could be innovations in low-resource food production that could help feed Earth’s still growing human population.

关键词： Create planet dried

As Planet Warms,Heat Pumps Get Hotter

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Engineering 2023年第10期29卷 2-4页

作者： Chris palmer Senior Technology Writer

The heat pump,an old device dating back to the early 1850s[1],has captured new attention for its potential to help meet climate change *** in large part by legislated incentives and bans on fossil-fuel heating in a growing number of countries,the heightened interest has also spawned improvements in the technology’s efficiency and *** unique benefit is for one device to provide,depending on seasonal needs,both heating and cooling.

关键词： pump Pump dating

Latest Climate Report Sounds Alarm on Closing Window for Mitigation

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Engineering 2023年第11期30卷 7-9页

作者： Chris palmer Senior Technology Writer

In a year that had already seen dozens of heat and extreme weather records shattered[1]and temperatures approaching the limit of human survival[2],the Intergovernmental Panel on Climate Change(IPCC)published its latest large-scale report,concluding that the world has warmed 1.1℃ above pre-industrial levels[3].Along with dire warnings for the future,the authors of the March 2023 report issued the hopeful message that many feasible and effective options are currently available to reduce greenhouse gas emissions and adapt to human-caused climate change—they just need to be implemented at greater speed and scale.

关键词： approaching extreme weather

Innovations Not Enough—Yet—to Make Headset Market an Actual Reality

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Engineering 2024年第10期41卷 4-6页

作者： Chris palmer Senior Technology Writer

In January 2024,after decades of intermittent improvements in virtual reality(VR)and augmented reality(AR)devices failing to help the technology catch on with the public,tech behemoth Apple(Cupertino,CA,USA)launched its marketing of a headset with by far the highest resolution and sharpest contrast of any commercially available device to date[1].Yet sales of the Vision Pro(Fig.1),Apple’s much anticipated first entry in the VR/AR marketplace,have fallen far short of the company’s already low expectations[2].

关键词： Market Apple sharp

Global Timekeepers Push Pause on the Leap Second

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Engineering 2023年第8期27卷 6-7页

作者： Chris palmer Senior Technology Writer

Half a century—plus 37 seconds—after it was first introduced to the world,the leap second has been scheduled for *** 18 November 2022 at the General Conference on Weights and Measures(CGPM)outside of Paris,France,representatives of governments around the globe decided that astronomical time(known as UT1),which is determined by Earth’s rotation,will be allowed to diverge by more than one second from Coordinated Universal Time(UTC),which is based on the steady ticking of atomic clocks[1].While the change—not to be implemented until 2035—will go unnoticed by most people,it promises to simplify the timekeeping vital to services provided by a wide range of global industries,including transportation,defense,and finance.

关键词： Push finance outside