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Machine learning for enumeration of cell colony forming units

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Visual computing for Industry,Biomedicine,and Art 2022年第1期5卷 315-322页

作者： louis Zhang Department of Molecular Biosciences College of Natural SciencesUniversity of Texas at AustinAustin TX 78713-8058USA

As one of the most widely used assays in biological research,an enumeration of the bacterial cell colonies is an important but time-consuming and labor-intensive *** speed up the colony counting,a machine learning method is presented for counting the colony forming units(cFUs),which is referred to as *** cellcounting program processes digital images and segments bacterial *** algorithm combines unsupervised machine learning,iterative adaptive thresholding,and local-minima-based watershed segmentation to enable an accurate and robust cell *** to a manual counting method,cFUcounter supports color-based cFU classification,allows plates containing heterologous colonies to be counted individually,and demonstrates overall performance(slope 0.996,sD 0.013,95%cI:0.97–1.02,p valuestinguishable from the gold standard of point-and-click *** cFUcounter application is open-source and easy to use as a unique addition to the arsenal of colony-counting tools.

关键词： colony forming unit Enumeration Image analysis Blue/white screen colony count

Does supplier concentration matter to investors during the cOV1D-19 crisis:evidence from china?

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Financial Innovation 2022年第1期8卷 2289-2316页

作者： louis T.W.cheng Jack s.c.Poon shaolong tang Jacqueline Wenjie Wang school of Business The Hang Seng University of Hong KongHong KongChina school of Accounting and Finance of the Hong Kong Polytechnic University Hong KongChina Division of Business and Management Beijing Normal University-Hong Kong Baptist UniversityUnited International CollegeZhuhaiChina

The literature shows that investor attention to customer–supplier disclosure increases when suppliers’information arrival is *** to the widespread of city lockdowns in china and the implementation of social distancing to control the cOVID-19 pandemic,investor attention to potential disruption of the supply chain spikes,leading to a price devaluation for firms with high supplier concentration *** find that a higher degree of supplier concentration is related to more serious stock price declines over the short-term and medium-term windows right after the Wuhan *** result lends support to the argument that the concentration risk of suppliers is a significant consideration for china stock market investors,especially under the potential financial distress at the firm level induced by the cOVID-19 crisis.

关键词： cOVID-19 supplier concentration supplier disclosure stock price effect Industry neutral portfolio

Kinetics study of the solvated electron decay in THF using laser-synchronised picosecond electron pulse

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Nuclear science and Techniques 2007年第1期18卷 10-15页

作者： Vincent De WAELE sébastien sORGUEs Pascal PERNOT Jean-louis MARIGNIER Mehran MOsTAFAVI Laboratoire de chimie Fhysique/ELYsE UMR CNRS/UPS 8000Bt.349Université Paris-Sud91405 OrsayFrance

Picosecond pulse radiolysis of neat tetrahydrofuran (THF) shows a fast decay of the solvated electron within *** decay of the solvated electron observed at 790nm is because of spur reaction.A numerical simulation using time dependent smoluchowski equation containing a sink term with a distance dependent reaction rate is used to fit the pulse-probe data and shows that the geminate reaction can proceed at long distance in this low polar solvent.

关键词：溶剂化电子衰减四氢呋喃激光同步化皮秒电子脉冲

comparative transcriptomics of anadromous and resident brook charr salvelinus fontinalis before their first salt water transition

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current Zoology 2012年第1期58卷 158-170页

作者： Boulet, Marylène Normandeau, Éric Bougas, Bérénice Audet, céline Bernatchez, louis IBIs (Institut de Biologie Intégrative et des systèmes) Université Laval Québec QC G1V 0A6 Canada IsMER Université du Québec à Rimouski Rimouski QC G5L 3A1 Canada

Most salmonid taxa have an anadromous life history strategy, whereby fish migrate to saltwater habitats for a growth period before returning to freshwater habitats for spawning. Moreover, several species are characterized by different life history tactics whereby resident and anadromous forms may occur in genetically differentiated populations within a same species, as well as polymorphism within a population. The molecular mechanisms underlying the physiological differences between anadromous and resident forms during the first transition from freshwater to saltwater environments are only partially understood. Insofar re- search has typically focused on species of the genus salmo. Here, using a 16,000 cDNA array, we tested the hypothesis that ana- dromous brook charr salvelinus fontinalis are characterized by differences in their transcriptome relative to resident brook charr before the anadromous fish migration. Families originating from parapatric populations of anadromous and resident charr were reared in controlled environments mimicking natural temperature and photoperiod, and sampled in spring, while still in fresh wa- ter. While anadromous and resident charr showed similar transcriptome profiles in white muscle, they were characterized by striking differences in their gill transcriptome profiles. Genes that were upregulated in the gills of anadromous charr were princi- pally involved in metabolism （mitochondrial electron transport chain, glucose metabolism, and protein synthesis）, development （tissue differentiation） and innate immunity. We discuss the nature of these transcriptomic differences in relation to molecular mechanisms underlying the expression of anadromous and resident life history tactics and suggest that the anadromous charr express some of the molecular processes present in other migratory salmonids [current Zoology 58 （1）： 158-170, 2012].

关键词： Transcriptome Life history tactics Anadromy Migration to salt water Ecotypes salmohids

Investigation of Particle Breakdown in the Production of composite Magnesium chloride and Zeolite Based Thermochemical Energy storage Materials

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Energy Engineering 2023年第10期120卷 2193-2209页

作者： louis F.Marie Karina sałek Tadhg s.O’Donovan HeriotWatt University Institute of MechanicalProcess and Energy EngineeringEdinburghUK

composite thermochemical energy storage(TcEs)represents an exciting field of thermal energy storage which could address the issue of seasonal variance in renewable energy ***,there are open questions about their performance and the root cause of some observed *** researchers have observed the breakdown of particles in their production phase,and in their *** study seeks to investigate the underlying cause of this *** and EDX analysis have been conducted on Mgcl2 impregnated 13X zeolite composites of differing diameters,as well as LiX *** was done in order to study the level of impregnation of salt into the zeolite matrix,as well as the effect this impregnation process has on the morphology of the *** was conducted using ImageJ software to study the effect of the impregnation process on the diameter of the *** has been found that a by weight impregnation concentration of magnesium chloride of 11.90%for the LiX zeolite,and 7.59%and 5.26%for the large diameter 13X zeolite and the small diameter 13X zeolite respectively has been *** has been found that the impregnation process significantly affects themorphology of 13X zeolite particles,causing large fissures to form,and eventually resulting in the previously found breakdown of these *** has been verified that a primary factor influencing the breakdown of the 13X zeolite particles is the efflorescence and sub-fluorescence phenomena,which leads to a build-up of crystals in the zeolite *** has also been found that prolonged impregnation times and the use of high concentration salt solutions in the soaking process can induce significant crystal growth which also leads to the breakdown of these *** demonstrate that LiX zeolite is the optimum host matrix choice in these *** results will allow for the design of more resilient composite TcEs particles.

关键词： composites thermochemical energy storage salt-in-porous-matrix zeolites seasonal storage

Homogenization of Hyperbolic Damped stochastic Wave Equations

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Acta Mathematica sinica,English series 2018年第2期34卷 233-254页

作者： Aurelien FOUETIO Jean louis WOUKENG Department of Mathematics and computer science University of Dschang P.O. Box 67 Dschang Cameroon Interdisciplinary center for scientific computing ( IWR) University of Heidelberg Im Neuenheimer Feld 205 69120 Heidelberg Germany

For a family of linear hyperbolic damped stochastic wave equations with rapidly oscillating coefficients, we establish the homogenization result by using the sigma-convergence method. This is achieved under an abstrac... 详细信息

关键词： Algebras with mean value stochastic hyperbolic partial differential equations Wiener process sigma-convergence

MULTIscALE HOMOGENIZATION OF NONLINEAR HYPERBOLIc EQUATIONs WITH sEVERAL TIME scALEs

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Acta Mathematica scientia 2011年第3期31卷 843-856页

作者： Jean louis Woukeng David Dongo Department of Mathematics and computer science Faculty of science University of Dschang

We study the multiscale homogenization of a nonlinear hyperbolic equation in a periodic *** obtain an accurate homogenization *** also show that as the nonlinear term depends on the microscopic time variable,the global homogenized problem thus obtained is a system consisting of two hyperbolic *** is also shown that in spite of the presence of several time scales,the global homogenized problem is not a reiterated one.

关键词： hyperbolic multiscale nonlinear

Phase coexistence properties of liquid mercury:a simulation study

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Rare Metals 2006年第5期25卷 567-571页

作者： Jean-louis Bretonnet Jean-Marc Bomont Laboratoire de Physique des Milieux Denses Université Paul Verlaine1bd F.D.Arago57078 MetzCedex 3France

The thermophysical properties of expanded liquid mercury have been investigated along the liquid-vapor coexistence curve by using Monte carlo and Molecular Dynamic simulations. For the purpose, an empirical state dependent interatomic potential for the region of dense metallic liquid is used, while the state dependence is not necessary near the cliffcal point. In order to test the validity of this potential, we determine the surface layering and the sound velocity, two properties very sensitive to the choice of the potential. Our results are in quite good agreement with other theoretical results and to the experimental data available in the literature.

关键词： mercury simulation phase coexistence liquid state

Examining the Factors that Influence the Use of social Media for Disaster Management by Underserved communities

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International Journal of Disaster Risk science 2022年第1期13卷 52-65页

作者： Thiagarajan Ramakrishnan louis Ngamassi shahedur Rahman Accounting Financeand Management Information Systems(MIS)Prairie View A&M UniversityPrairie ViewTX 77446USA

This study examined the propensity of social media use by underserved communities by drawing on the literature on the digital divide and attribution ***,this research explored the factors that can influence the use of social media for disaster *** study used survey methodology to collect data and partial least squares structural equation modeling(PLssEM)to analyze the data and test the *** results of the study indicate:(1)that the propensity of social media use for disaster management is low for underserved communities;(2)a positive relationship between an individual’s effort and the intention to use social media for disaster management;and(3)a negative relationship between task difficulty and the intention to use social media for disaster *** study expanded the literature on the use of social media in disaster *** article also provides both theoretical and practical implications.

关键词： Attribution theory Digital divide Disaster management social media use Texas Underserved communities