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Development of FBMINC model for particle diffusion in fluids

International Journal of sediment Research 2009年第4期24卷 439-454页

作者： paul s ADDIsION CardioDigital Ltd Elvingston Science Centre

An accurate particle tracking method using FBMINC (new fractional Brownian motion) is outlined. It generates non-Fickian diffusion rather than Fickian diffusion as traditional particle tracking model does. The FBMINC model is based on fractional Brownian motion (fBm) which is generalization of regular Brownian motion. The two models of fBms (FBM model and FBMINC model) were explored and the differences of the two models are compared from the three aspects: the standard deviation of each step, the small memory and the effect of the number of particles in the cloud. The results show the FBMINC model is a better model as it produces more accurate statistics. The effect of simple shear dispersion for both Brownian and fBm was investigated. The power law scaling of fBm shear dispersion was correctly identified. In addition, a scaling coefficient was found numerically. The FBMINC model is then used for producing both superdiffusive and subdiffusive particle paths, therefore, the non-Fickian diffusion of soil particle clouds can be modelled. The particle clouds represent soil contaminant are released in an idealised coastal bay and the fBm particle tracking method is used for simulation the particle cloud spreading in the bay. There is a noticeable increase in the spreading rate of the cloud. In addition, owning to the spreading rate of the cloud, a noticeable part of it has escaped the bay area and transported downstream. The variation of the Hurst exponent can lead to an area of the flow being affected by a contaminant cloud which is not picked up by the regular Brownian motion models. The purpose of this paper is to bring soil transport engineers a new angle on soil particle transport research in fluids. Using FBMINC particle tracking model allows more flexibility in simulation of diffusion in soil contaminant spread in coastal bay or ocean surface.

关键词： Random walk Fractional Brownian motion Particle tracking soil contaminant spread

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Rock mechanical investigation of strata loading characteristics to assess caving and requirement of support resistance in a mechanized powered support longwall face

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International Journal of Mining science and Technology 2016年第6期26卷 1081-1087页

作者： Aveek Mangal P.s.paul Department of Mining Engineering Indian Institute of Technology(Indian School of Mines)Dhanbad826004JharkhandIndia

Longwall mining is one of the most acclaimed and widely used in underground method for coal extraction. The interaction of powered supports with the roof is the key issue in strata mechanics of longwall mining. Controlled caving of rock mass is a prerequisite pro thriving exploitation of coal deposits by longwall retreat with caving technique and support resistance has evolved as the most promising and effective scientific tool to predict various aspects related to strata mechanics of such workings. Load density,height of caving block, distance of fractured zone ahead of the face, overhang of goaf and mechanical strength of the debris above and below the support base have been found to influence the magnitude of load on supports. Designing powered support has been attempted at the different countries in different methods. This paper reviews the mechanism of roof caving and the conventional approaches of caving behaviour and support resistance requirement in the context of major strata control experiences gained worldwide. The theoretical explanation of the mechanism of roof caving is still continuing with consistently improved understanding through growing field experiences in the larger domain of geo-mining conditions and state-of-art strata mechanics analysis and monitoring techniques.

关键词： Longwall mining Geo-mechanics Caving behaviour support resistance

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Investigation of the role of personal factors on work injury in underground mines using structural equation modeling

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International Journal of Mining science and Technology 2013年第6期23卷 815-819页

作者： P.s.paul Department of Mining Engineering Indian School of Mines

Work injuries in mines are complex and generally characterized by several factors starting from personal to technical and technical to social *** this paper,investigation was made through the application of structural equation modeling to study the nature of relationships between the influencing/associating personal factors and work injury and their sequential relationships leading towards work injury occurrences in underground coal *** variables namely,rebelliousness,negative affectivity,job boredom,job dissatisfaction and work injury were considered in this *** were developed to quantify them through a questionnaire *** mine workers were randomly selected for the *** from 300 participants were used for the *** structural model of LIsREL was used to estimate the interrelationships amongst the *** case study results show that negative affectivity and job boredom induce more job dissatisfaction to the workers whereas risk taking attitude of the individual is positively influenced by job dissatisfaction as well as by rebelliousness characteristics of the ***,risk taking and job dissatisfaction are having positive significant direct relationship with work *** findings of this study clearly reveal that rebelliousness,negative affectivity and job boredom are the three key personal factors influencing work related injuries in mines that need to be addressed properly through effective safety programs.

关键词： structural equation modeling Mine safety Occupational health and safety Work injury

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Progress in noncommutative function theory

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science China Mathematics 2011年第11期54卷 2275-2294页

作者： MUHLY paul s sOLEL Baruch Department of Mathematics University of IowaIowa CityIA 52242USA Department of Mathematics TechnionHaifa 32000Israel

In this expository paper,we describe the study of certain non-self-adjoint operator algebras,the Hardy algebras,and their representation *** view these algebras as algebras of (operator valued) functions on their spaces of *** will show that these spaces of representations can be parameterized as unit balls of certain W*-correspondences and the functions can be viewed as schur class operator functions on these *** will provide evidence to show that the elements in these (non commutative) Hardy algebras behave very much like bounded analytic functions and the study of these algebras should be viewed as noncommutative function theory.

关键词： Hardy algebras tensor algebras schur class representations W^*-correspondence

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Predictors of work injury in underground mines—an application of a logistic regression model

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Mining science and Technology 2009年第3期19卷 282-289页

作者： P. s. paul Department of Mining Engineering Indian School of Mines University

Mine accidents and injuries are complex and generally characterized by several factors starting from personal to technical, and technical to social *** this study, an attempt has been made to identify the various factors responsible for work related injuries in mines and to estimate the risk of work injury to mine *** prediction of work injury in mines was done by a step-by-step multivariate logistic regression modeling with an application to case study mines in *** total, 18 variables were considered in this *** of the variables are not directly *** were developed to quantify them through a questionnaire type *** mine workers were randomly selected for the *** from 300 participants were used for the *** variables, age, negative affectivity, job dissatisfaction, and physical hazards, bear significant discriminating power for risk of injury to the workers, comparing between cases and controls in a multivariate situation while controlling all the personal and socio-technical *** analysis reveals that negatively affected workers are 2.54 times more prone to injuries than the less negatively affected workers and this factor is a more important risk factor for the case-study *** term planning through identification of the negative individuals, proper counseling regarding the adverse effects of negative behaviors and special training is urgently *** should be taken for the aged and experienced workers in terms of their job responsibility and training *** should provide a friendly atmosphere during work to increase the confidence of the injury prone miners.

关键词： mine safety logistic model case control study occupational injury

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How to make a human germ cell

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Asian Journal of Andrology 2015年第3期17卷 441-442页

作者： paul s Cooke Manjunatha K Nanjappa Department of Physiological sciences College ofVeterinary Medicine University of Florida GainesvilleFL 32608 USA

How the primordial germ cell （PGC） lineage, which eventually gives rise to spermatozoa in males and oocytes in females, is established in the developing mammalian embryo has been a critical topic in both developmental and reproductive biology for many years. There have been significant breakthroughs over the past two decades in establishing both the source of PGCs and the factors that regulate the specification of this lineage in mice,~ but our understanding of the factors that control PGC development in the human is rudimentary. The sRY-related HMG-box （sOX） family of transcription factors consists of 20 genes in humans and mice that are involved in the maintenance of pluripotency, male sexual development, and other processes. A recent paper in Cell has identified one member of this family, sOX17, as an essential factor for inducing the PGC lineage in ***, this protein does not appear to have a role in PGC specification in mice. This work not only introduces a new and important player to the field of germ cell specification, but also emphasizes the uniqueness of human PGC development compared to more extensively studied mouse models.

关键词： @@

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Another piece of the meiosis puzzle

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Asian Journal of Andrology 2017年第1期19卷 3-4页

作者： paul s Cooke Manjunatha K Nanjappa Department of Physiological sciences College ofVeterinary Medicine University of Florida GainesvilleFL 32608 USA.

Meiosis, the process by which the ovary and testis produce haploid gametes from initially diploid cells, is essential for sexual reproduction in mammals. This process, initially described in the late 19th and early 20th century using model organisms such as sea urchins, worms and fruit flies, continues to attract extensive interest from reproductive biologists due to its centrality in gametogenesis.

关键词： testis produce haploid

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Osteopontin is an important mediator of alcoholic liver disease via hepatic stellate cell activation

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World Journal of Gastroenterology 2014年第36期20卷 13088-13104页

作者： Devanshi seth Alastair Duly paul C Kuo Geoffrey W McCaughan paul s Haber Drug Health services Royal Prince Alfred Hospital Camperdown NSW 2050 Australia Garvan Institute Darlinghurst NSW 2010 Australia Central Clinical school of Medicine the University of Sydney Sydney NSW 2050 Australia Department of surgery Loyola University Medica Centre Maywood IL 60153 United States AW Morrow Gastroenterology and Liver Centre RPAH Camperdown NSW 2050 Australia

AIM: To investigate over-expression of Osteopontin (OPN) pathway expression and mechanisms of action in human alcoholic liver disease (ALD), in vivo and in vitro acute alcohol models.

关键词： Hepatic stellate cells Liver cirrhosis Plasmin steatosis Fibrogenesis Transforming growth factor β Osteopontin isoform

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Oxidative dehydrogenation of propane under steady-state and transient regimes over alumina-supported catalysts prepared from mixed V_2W_4O_(19)^(4-) hexametalate precursors

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Journal of Natural Gas Chemistry 2010年第2期19卷 123-133页

作者： sébastien paul Elise Berrier Marcia Cristina Kaezer Frana Jean-Guillaume Eon Univ Lille Nord de France F-59000 LilleFrance ECLille UCCSF-59650 Villeneuve d'AscqFrance CNRs UMR 8181F-59650 Villeneuve d'AscqFrance UsTL UCCSF-59650 Villeneuve d'AscqFrance Instituto de Quimíca Universidade Federal do Rio de Janeiro-Cidade UniversitáriaIlha do Fundo21945-970 Rio de JaneiroBrazil

An integrated approach combining the development of an innovative catalyst and the research of a set of adequate operating conditions for the propane oxidative dehydrogenation （ODH） is *** experimental set-up,specially designed for steady-state and transient studies is *** preparation method,the characterization and the performances in steady-state and transient regimes of catalysts based on V2W4O194-Lindqvist isopolyanion used as a precursor and supported on alumina are *** influence of the preparation method of the catalyst and the role of water in the feed gas are more particularly discussed.

关键词： propane oxidative dehydrogenation (ODH) transient regime pulsed reactor Lindqvist isopolyanion in-situ Raman

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Keggin-type H_4PVMo_(11)O_(40)-based catalysts for the isobutane selective oxidation

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science China Chemistry 2010年第9期53卷 2039-2046页

作者： paul sébastien sULTAN Manzoor BORDEs-RICHARD Elisabeth Université Lille Nord de France ECLilleUnité de Catalyse et de Chimie du Solide(UMR CNRS 8181)Cité Scientifique Université Lille Nord de France ENSCLUnité de Catalyse et de Chimie du Solide(UMR CNRS 8181)Cité Scientifique

Cesium heteropolysalts Cs3PMo12O40 and HCs3PVMo11O40 were synthesized by modifying the preparation conditions in order to get materials with a much higher surface area than the original Keggin-type heteropolyacids(H3PMo12O40 and H4PVMo11O40).These solids were used as carriers for the dispersion of H4PVMo11O40 heteropolyacid by the incipient wetness impregnation *** textural and structural properties of supports and catalysts were examined by scanning electron microscopy,N2 adsorption-desorption isotherms and Raman *** supported catalysts were studied before and after red/ox pretreatments by X-ray photoelectron spectroscopy,which showed that both the surface composition and oxidized to reduced species ratio depend on the used *** catalytic performances of these novel supported catalysts in the selective oxidation of isobutane to methacrylic acid and methacrolein were *** best catalytic properties were obtained when H4PVMo11O40 was supported on *** isobutane conversion and yield of the desired oxygenates increased along the unsupported H4PVMo11O40s3PMo12O40s3PVMo11O40 series.

关键词： cesium heteropolysalts supports supported H4PVMo11O40 red/ox XPs isobutane selective oxidation Keggin-type heteropolycompounds

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