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Turbulent flow simulation of a single-blade Magnus rotor

Advances in Aerodynamics 2021年第1期3卷 316-337页

作者： X.Bai C.Ji P.Grant n.phillips U.Oza E.J.Avital J.J.R.Williams School of Engineering and Materials Science Queen Mary University of LondonMile End RoadLondon E14NSUK Siemens Ltd. ChinaTechnologyBeijing 100102China State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China Grant Applied Sciences 3rd Floor3 Fitzhardinge StreetLondon W1H 6EUK.

This paper presents numerical studies of the Magnus effect for a kinetic turbine on a horizontal *** focus on the Magnus blade,a single self-spinning cylindrical blade is *** iterative direct-forcing immersed boundary method is employed within the Eulerian-Lagrangian framework due to its capability to treat complex and moving *** Eulerian fluid domain is discretized using the finite volume method while the Magnus rotor is represented by a set of discrete points/*** aim of the numerical studies is to provide insights for the design process and predict aerodynamic performances under various operating *** for stationary and self-spinning cylinders in turbulent flows are found to be in good agreement with published *** increasing the aspect ratio of the cylinder(simulated segment length over its diameter)from 3 to 10,a 30%drop in lift coefficient and a 22%increase in drag coefficient were observed,which is believed to be attributed to an enhancement of the three-dimensionality of the *** the Magnus rotor,key parameters such as dynamic forcing and frequency,distribution of pressure coefficient and torque have been produced for two cases with different structural designs and working *** increase of the aspect ratio from 3 to 10,stable forces are observed from the root side of the blade and the torque coefficient increases from 0.68 to 2.1,which indicates a superior performance in terms of power extraction.

关键词： Immersed boundary method Large eddy simulation Magnus effect Spinning cylinder

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相位测量的误差问题

相位测量的误差问题

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作者： Edwin n.phillips 刘通阳

相比誤差模糊点的极限,不管是单个元件还是級联元件的,均能通过相应的列綫图迅速确定。要达到±1度的相位测量精度,困难来自諸元件的公差上。在微波领域內,由于复馈传輸系統的出現,使精确测量相位和幅度显得更为重要。但是,对于这样的測...

相比誤差模糊点的极限,不管是单个元件还是級联元件的,均能通过相应的列綫图迅速确定。要达到±1度的相位测量精度,困难来自諸元件的公差上。在微波领域內,由于复馈传輸系統的出現,使精确测量相位和幅度显得更为重要。但是,对于这样的測量,由于电路連結处和与此类似的不連續处难免要有失配,因而必定会碰到一个誤差范围問題。这个誤差范围利用普通的开槽綫式干涉仪能很好地分析判断出来。因为它是同时而不是相继地測定出相对的振幅和相位。所得結果,不仅适用于复馈传輸系統和一般的TEM同軸传輸設备,而且同样也适用于其它类型的传輸結构和系統。

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Discovery of a non-adenylating acyl-CoA ligase and restoring its adenylation activity

Discovery of a non-adenylating acyl-CoA ligase and restoring...

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中国化学会第十二届全国天然有机化学学术会议

作者： nan Wang Jeffrey D.Rudolf Liao-Bin Dong Jerzy Osipiuk Catherine Hatzos-Skintges Michael Endres Chin-Yuan Chang Gyorgy Babnigg AnDrzej Joachimiak George n.phillips Jr Ben Shen Department of Chemistry The Scripps Research Institute Midwest Center for Structural Genomics and Structural Biology Center Biosciences DivisionArgonne National Laboratory Department of Biosciences Rice University Department of Molecular Medicine The Scripps Research Institute natural Products Library Initiative at The Scripps Research Institute The Scripps Research Institute

Acyl-coenzyme A（CoA） ligases catalyze the activation of carboxylic acids via a two-step reaction of adenylation followed by ***,we report the discovery of a non-adenylating acyl-CoA ligase PtmA2 and the functional separation of an acyl-CoA ligase *** PtmA1 and PtmA2,two acyl-CoA ligases from the biosynthetic pathway of platensimycin and platencin,are necessary for the two steps of CoA *** inactivation of ptmA1 and ptmA2 resulted in the accumulation of free acid and adenylate intermediates,*** and structural characterization of PtmA2 confirmed its ability to only catalyze *** characterization of PtmA2 revealed it binds both free acid and adenylate substrates and undergoes the established mechanism of domain ***,site-directed mutagenesis restored both the adenylation and complete CoA activation *** study challenges the currently accepted paradigm of adenylating enzymes and inspires future investigations on functionally separated acyl-CoA ligases and their ramifications in biology.

关键词： acyl-CoA synthetase acyl-CoA ligase platensimycin platencin

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nanofabricated high turn-density spiral coils for on-chip electromagneto-optical conversion

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Microsystems & nanoengineering 2024年第2期10卷 181-192页

作者： Ilhan Bok Alireza Ashtiani Yash Gokhale Jack phillips Tianxiang Zhu Aviad Hai Department of Biomedical Engineering University of Wisconsin–MadisonMadisonWIUSA Department of Electrical and Computer Engineering University of Wisconsin–MadisonMadisonWIUSA Wisconsin Institute for Translational neuroengineering(WITne) University of Wisconsin–MadisonMadisonWIUSA

Circuit-integrated electromagnets are fundamental building blocks for on-chip signal transduction,modulation,and tunability,with specific applications in environmental and biomedical micromagnetometry.A primary challenge for improving performance is pushing quality limitations while minimizing size and fabrication complexity and retaining spatial *** efforts have exploited highly involved three-dimensional synthesis,advanced insulation,and exotic material ***,we present a rapid nanofabrication process that employs electron beam dose control for high-turn-density diamond-embedded flat spiral coils;these coils achieve efficient on-chip electromagnetic-to-optical signal *** fabrication process relies on fast 12.3 s direct writing on standard poly(methyl methacrylate)as a basis for the metal lift-off *** with 70 micrometer overall diameters and 49–470 nm interturn spacings with corresponding inductances of 12.3–12.8 nH are *** utilize optical micromagnetometry to demonstrate that magnetic field generation at the center of the structure effectively correlates with finite element modeling *** designs based on our process can be integrated with photolithography to broadly enable optical magnetic sensing and spin-based computation.

关键词： utilize retaining high

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Shifting the paradigm:A critical review of social innovation literature

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International Journal of Innovation Studies 2024年第1期8卷 45-58页

作者： Amy phillips Rosalie Luo Joel Wendland-Liu Social Innovation Program Grand Valley State UniversityGrand Rapids49504USA Ivey School of Business Western UniversityPLondonN6A 0E1Canada Social Innovation Program Grand Valley State UniversityAllendale49401USA

In this review of ten years of social innovation research(2012e2022),we define and explore three paradigms in the field:instrumentalist,strong,and *** investigate how language usage and geography play a central role in identifying which paradigms recently published scholarship falls *** we do not insist that sharp divisions exist between each paradigm,we do find that on the“instrumentalist”side,language tends to abstract or neutralize power ***,these perspectives tend to derive from Western or Eurocentric orientations or ***“strong”paradigm accepts the necessity of institutional and stakeholder engagement and seeks to engage socially excluded *** contrast,geographical diversity,attendance to historicized and systemic inequalities,and elevation of the most marginalized communities are more likely to be centered in the“democratic”*** apply this discussion to recent research in arts-related social innovation and the related field of social entrepreneurship.

关键词： Social innovation Culture Arts Social entrepreneurship Ethnocentrism

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Characterisation of the optical properties of InGan MQW structures using a combined SEM and CL spectral mapping system

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Journal of Semiconductors 2011年第1期32卷 1-2页

作者： Mark n.Lockrey Matthew R.phillips Physics and Advanced Materials University Technology

We demonstrate the ability of a combined scanning electron microscope and cathodoluminescence （CL） spectral mapping system to provide important spatially resolved information. The degree of inhomogeneity in spectral output across a multi-quantum well sample is measured using the SEM-CL system as well as measuring the efficiency roll-off with increasing carrier concentration. The effects of low energy electron beam modification on the InGan/Gan multi quantum wells have also been characterized.

关键词： InGan/Gan quantum wells cathodoluminescence spectral mapping electron beam irradiation

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Capacity of Old Trees to Respond to Environmental Change

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Journal of Integrative Plant Biology 2008年第11期50卷 1355-1364页

作者： nathan G.phillips Thomas n.Buckley David T.Tissue Centre for Plant and Food Science University of Western Sydney Department of Geography and Environment Boston University Department of Biology Sonoma State University School of Biological Earth and Environmental SciencesUniversity of New South Wales Bushfire Cooperative Research Centre

Atmospheric carbon dioxide [CO2] has increased dramatically within the current life spans of long-lived trees and old forests. Consider that a 500-year-old tree in the early twenty-first century has spent 70% of its life growing under preindustrial levels of [CO2], which were 30% lower than current levels. Here we address the question of whether old trees have already responded to the rapid rise in [CO2] occurring over the past 150 years. In spite of limited data, aging trees have been shown to possess a substantial capacity for increased net growth after a period of post-maturity growth decline. Observations of renewed growth and physiological function in old trees have, in some instances, coincided with Industrial Age increases in key environmental resources, including [CO2], suggesting the potential for continued growth in old trees as a function of continued global climate change.

关键词： carbon dioxide hydraulic limitation old growth stomata tree rings.

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Transport Characteristics of Mesoscopic Radio-Frequency Single Electron Transistor

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Chinese Physics Letters 2008年第1期25卷 250-253页

作者： A. H. phillips n. A. I. Aly K. Kirah H. E. El-Sayes Faculty of Engineering Ain-Shams University Cairo Egypt Higher Technological Institute Ramadan Tenth City Egypt

The transport property of a quantum dot under the influence of external time-dependent field is investigated. The mesoscopic device is modelled as semiconductor quantum dot coupled weakly to superconducting leads via asymmetric double tunnel barriers of different heights. An expression for the current is deduced by using the Landauer-Buttiker formula, taking into consideration of both the Coulomb blockade effect and the magnetic field. It is found that the periodic oscillation of the current with the magnetic field is controlled by the ratio of the frequency of the applied ac-field to the electron cyclotron frequency. Our results show that the present device operates as a radio-frequency single electron transistor.

关键词： pulsars x-ray spectra relativity and gravitation redshift

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Ranking higher taxa using divergence times:a case study in Dothideomycetes

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Fungal Diversity 2017年第3期84卷 75-99页

作者： Jian-Kui Liu Kevin D.Hyde Rajesh Jeewon Alan J.L.phillips Sajeewa S.n.Maharachchikumbura Martin Ryberg Zuo-Yi Liu Qi Zhao Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of SciencesKunming 650201People’s Republic of China Guizhou Institute of Biotechnology Guizhou Academy of Agricultural SciencesGuiyang 550006People’s Republic of China Guizhou Key Laboratory of Agricultural Biotechnology Guizhou Academy of Agricultural SciencesGuiyang 550006People’s Republic of China Center of Excellence in Fungal Research Mae Fah Luang UniversityChiang Rai 57100Thailand Departmental of Health Sciences Faculty of ScienceUniversity of MauritiusReduitMauritius University of Lisbon Faculty of SciencesBiosystems and Integrative Sciences InstituteCampo Grande1749-016 LisbonPortugal Department of Crop Sciences College of Agricultural and Marine SciencesSultan Qaboos UniversityPO Box 8123 Al KhoudOman Department of Organismal Biology Uppsala UniversityNorbyvägen 18D75236 UppsalaSweden

The current classification system for the recognition of taxonomic ranks among fungi,especially at highranking level,is *** the development of molecular approaches and the availability of fossil calibration data,the use of divergence times as a universally standardized criterion for ranking taxa has now become *** can therefore date the origin of Ascomycota lineages by using molecular clock methods and establish the divergence times for the orders and families of *** chose Dothideomycetes,the largest class of the phylum Ascomycota,which contains 32 orders,to establish ages at which points orders have split;and Pleosporales,the largest order of Dothideomycetes with 55 families,to establish family divergence *** have assembled a multi-gene data set(LSU,SSU,TEF1 and RPB2)from 391 taxa representing most family groups of Dothideomycetes and utilized fossil calibration points solely from within the ascomycetes and a Bayesian approach to establish divergence times of Dothideomycetes *** separated datasets were analysed:(i)272 taxa representing 32 orders of Dothideomycetes were included for the order level analysis,and(ii)191 taxa representing 55 families of Pleosporales were included for the family level *** results indicate that divergence times(crown age)for most orders(20 out of 32,or 63%)are between 100 and 220 Mya,while divergence times for most families(39 out of 55,or 71%)are between 20 and 100 *** believe that divergence times can provide additional evidence to support establishment of higher level taxa,such as families,orders and *** advantage of this added approach,we can strive towards establishing a standardized taxonomic system both within and outside *** this study we found that molecular dating coupled with phylogenetic inferences provides no support for the taxonomic status of two currently recognized orders,namely Bezerromycetales and Wiesneriomycetales and these are treated as sy

关键词： BEAST Clade age Classification Calibration Family Order Phylogeny Pleosporales

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活性细胞骨架网络中的力传播

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医用生物力学 2024年第S1期 401-401页

作者：屈子杰刘世琛 Rosalind Wenshan Pan Heun Jin Lee Shahriar Shadkhoo Fan Yang David Larios 李春赫 Rob phillips Matt Thomson 上海交通大学密西根学院美国加州理工学院

在生物系统中,由驱动蛋白和丝蛋白构成的消耗能量的活性网络可以产生驱动力并作用于多种生物过程,包括细胞运动、形状变化和复制等。这种活性网络的功能不可或缺,然而,分子尺度蛋白的相互作用如何能够使力在微米尺度上进行组织和传递仍...

在生物系统中,由驱动蛋白和丝蛋白构成的消耗能量的活性网络可以产生驱动力并作用于多种生物过程,包括细胞运动、形状变化和复制等。这种活性网络的功能不可或缺,然而,分子尺度蛋白的相互作用如何能够使力在微米尺度上进行组织和传递仍然难以捉摸。本研究证明了微管的捆绑(增长)可以使活性物质系统在“全局力传递”相和“局部力耗散”相间相互转化。平均微管长度增加5倍会导致局部相到全局相的转变。转变后,力传播的长度尺度增加100倍并且力的大小增加了20倍。全局相下活性物质系统可产生(10 p n)力场,使包括细胞运输和液滴运动等应用成为可能。通过理论和模拟证明,即使存在少数长微管也可以诱导局部和全局相之间的逾渗转变,为细胞中的力传递提供调节机制。本研究结果揭示了细胞中力传导机制,并使活性材料应用于合成生物学和软机器人成为可能。

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