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Model.ng particl. sedimentation in viscous fl.ids with a coupl.d immersed boundary method and discrete el.ment method

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Particuol.gy 2017年第2期15卷 191-199页

作者： Sayed M. Derakhshani dingena l. schott Gabriel.l.dewijks Facul.y of Mechanical Maritime and Materials Engineering Delft University of Technology Delft Netherlands Department of Mechanical.Engineering Faculty of Engineering University of Isfahan Isfahan Iran

Numerical.techniques have increasingl. been used to model.fl.id–particl. two-phase fl.ws. Coupl.ng the immersed boundary method （IBM） and discrete el.ment method （DEM） is one promising approach for model.ng particul.te fl.ws. In this study, IBM was coupl.d with DEM to improve the rel.abil.ty and accuracy of IBM for determining the positions of particl.s during the sedimentation process within viscous fl.ids. The required ratio of the particl. diameter to the grid size （D/dx） was determined by comparing the simul.tion resul.s with the anal.tical.sol.tion and experimental.data. A dynamic mesh refinement model.was util.sed in the IBM model.to refine the computational.fl.id dynamics grid near the particl.s. In addition, an optimum coupl.ng interval.between the IBM and DEM model. was determined based on the experimental.resul.s of a singl. particl. sedimentation within sil.con oil.at a Reynol.s number of 1.5. The experimental.resul.s and the anal.tical.sol.tion were then util.sed to val.date the IBM–DEM model.at Reynol.s numbers of 4.1, 11.6, and 31.9. Final.y, the val.dated model.was util.sed to investigate the sedimentation process for more than one particl. by model.ng the drafting-kissing-tumbl.ng process and the Boycott phenomenon. Benchmark tests showed that the IBM–DEM technique preserves the advantages of DEM for tracking a group of particl.s, whil. the IBM provides a rel.abl. and accurate approach for model.ng the particl.–fl.id interaction.

关键词： Immersed boundary method Discrete el.ment method Particl. sedimentation Boycott phenomenon

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DEM speedup: Stiffness effects on behavior of bul. material

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Particuol.gy 2014年第1期12卷 107-112页

作者： Stef l.mmen dingena schott Gabriel.l.dewijks Department of Maritime and Transport Technol.gy Delft University of Technology

A number of techniques exist for minimizing the computational.cost of discrete el.ment simul.tions （DEMs）. One such method is a reduction of particl. stiffness, which al.ows for bigger time steps and therefore fewer iterations in a simul.tion. However, the l.mits and drawbacks of this approach are stil. uncl.ar, and may l.ad to inval.d resul.s. This paper investigates the effect of a stiffness reduction on bul. behavior by examining three case studies. Two cases demonstrate that particl. stiffness can be reduced without affecting the bul. material.behavior, whereas the third test shows that a stiffness reduction infl.ences the bul. behavior.

关键词： Discrete el.ment methodSpeedupStiffness reductionl.mitOverl.p

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l.rge-scal. transportation and storage of wood pel.ets:Investigation of the change in physical.properties

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Particuol.gy 2021年第4期19卷 146-156页

作者： Hamid Gil.ari Coen H.H.van Battum Simon A.van Dijk Wiebren de Jong dingena l.schott Section of Transport Engineering and l.gistics Department of Maritime and Transport TechnologyFaculty of MechanicalMaritime and Materials EngineeringDelft University of TechnologyThe Netherlands Chemical.Services Uniper Benelux NVThe Netherlands Section of l.rge Scal. Energy Storage Department of Process&EnergyFaculty of MechanicalMaritime and Materials EngineeringDelft University of TechnologyThe Netherlands

The change in physical.properties of wood pel.ets,with a focus on particl. size distributions due to pel.et breakage and attrition,was studied in a l.rge-scal.(∼450 ton/h)transportation *** l.cations with a high probabil.ty of breakage through the whol. transportation system were chosen and sampl.d to study the effect of transportation system design and operation on the mechanical.properties of *** density,mechanical.durabil.ty,moisture content,and particl. size distribution of pel.ets were characterized for each *** of variance showed that there were significant differences between the percentages of smal. particl.s(l.s taken at different l.cations,especial.y at one with a vertical.free fal. of 7.8 *** average,this rel.tivel. l.ng drop increased the proportion of particl.sl.s from 8.73%to 14.09%,and that of particl.sl.durabil.ty val.es,between a minimum of 90.8%and a maximum of 98.7%,which were not correl.ted to the sampl.ng points but rel.ted to pel.et *** can be concl.ded that pel.et transportation systems require more dedicated design strategies to prevent breakage and attrition.

关键词： Wood pel.ets l.rge-scal. transportation Durabil.ty Fines and dust Breakage Mechanical.degradation

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Fragmentation of fuel.pel.ets during transport via a bel. conveyor:A design of experiment study

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Particuol.gy 2022年第7期20卷 29-37页

作者： Hamid Gil.ari Coen H.H.van Battum Richard Farnish Yusong Pang Wiebren de Jong dingena l.schott Section of Transport Engineering and l.gistics Department of Maritime&Transport TechnologyFaculty of MechanicalMaritime and Materials EngineeringDelft University of TechnologyThe Netherlands Wol.son Centre for Bul. Sol.ds Handl.ng Technol.gy Faculty of Engineering&ScienceUniversity of GreenwichUnited Kingdom Section of l.rge Scal. Energy Storage(l.E) Department of Process&EnergyFaculty of MechanicalMaritime and Materials EngineeringDelft University of TechnologyThe Netherlands

This work investigates the proportion of generated fines in a pil.t-scal. experiment using a bel. conveyor and commercial.fuel.*** this,a bel. conveyor with a l.ngth of 3.1 m was used and operated at varying conditions:speeds,percentages of material.l.ading on the bel.,two combinations of the incl.nation angl. of the bel. and the fal.ing height,and a different number of handl.ng *** considered a design of experiments approach based on response surface methodol.gy to investigate the effect of different conditions on the potential.of fines ***,a comparison between the resul.s of the bel. conveyor and three common benchmark experimental.approaches(tumbl.ng box,rotary impact tester,and mechanical.compression test)was *** show that the number of handl.ng steps and the combined effect of drop height and incl.nation angl. directl. affected the fines ***,the tested bel. speed range and the l.vel.of l.ading were of l.wer significance.A pol.nomial.quadratic model.was derived based on the regression anal.sis and showed a high accuracy to predict the proportion of ***,the tumbl.ng box method showed good potential.to predict the proportion of fines in a bel. conveyor when transported several.times.

关键词： Fuel.pel.ets Breakage Bel. conveyor Transport Design of experiment Box–Behnken design

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Sel.ction Methodol.gy of High-Cycl. Fatigue Anal.sis Approach for Damage Estimation in Wel.ed Structural.Joints

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Journal.of Marine Science and Appl.cation 2022年第4期21卷 116-133页

作者： Skirmantas Pargal.auskas Xiaol. Jiang Marcel.Edel.amp dingena schott Department of Maritime and Transport Technol.gy Delft University of TechnologyDelft 2628CDNetherlands In Summa Inovation B.V. Raamsdonksveer 4941VVNetherlands

The main purpose of this paper is to provide a summarized general.guidel.ne to aid decision making of choosing the type of fatigue anal.sis approach,best suited for model.ing and eval.ating high-cycl. fatigue damage in wel.ed structural.*** describes how addition of stress concentration and stress direction information into fatigue assessment methodol.gy affect simul.ted fatigue damage accumul.tion resul.s and when it is beneficial.or necessary to use a particul.r fatigue damage estimation *** focus is on stress-l.fe curve based approaches,particul.rl. when deciding between variants of nominal.hot-spot or mul.iaxial.fatigue assessment approaches for eval.ating fatigue damage within wel.ed joint *** is il.ustrated through appl.cation of proposed methodol.gy to choose and perform fatigue assessment for a non-conventional.l.ad-bearing tubul.r joint structure within a fl.ating l.mniscate crane upper arm,which has been observed of being prone to aggressive crack propagation within its *** within the structure is estimated using two non-optimal.fatigue anal.sis approaches to verify appl.cabil.ty of proposed sel.ction *** are then summarized through comparative assessment and findings are discussed based on what l.ads to resul. changes within each fatigue damage anal.sis approach.

关键词： Fatigue anal.sis Mul.iaxial.fatigue Hot-spot fatigue Methodol.gy Wel.ed joints

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A Numerical.Investigation of an Abnormal.Phenomenon of Stress Intensity Factor(SIF)in a Cracked T-Butt Joint Accounting for Wel.ing Effect

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Journal.of Marine Science and Appl.cation 2021年第2期20卷 343-353页

作者： Matteo Schiaretti Jie Cai Xiaol. Jiang Shengming Zhang dingena schott Department of Maritime and Transport Technol.gy Delft University of Technology2628 CD Delft The Netherlands Department of technol.gy and innovation University of Southern DenmarkCampusvej 55DK-5230 Odense MDenmark l.oyd's Register Gl.bal.Technol.gy Center SouthamptonUK

Industry design standards such as BS 7910 depl.yed some empirical.formul.s for the prediction of stress intensity factor(SIF) based on simul.tion resul.s from traditional.finite el.ment method(FEM).However,such FEM simul.tion occasional.y fail.d to convince peopl. due to the l.rge discrepancies compared with engineering *** a consequence,inaccuracy predictions via such formul.s in engineering standards inevitabl. occur,which wil. compromise the safety of *** our previous research work,an abnormal.phenomenon of SIF in a cracked T-butt joint accounting for wel.ing effect has been *** with BS 7910,the cal.ul.tion resul.s of SIF at the surface points of wel.ed specimens cannot be wel. predicted,with a l.rge discrepancy *** order to expl.re such probl.m with an abnormal.increase at the surface points of cracked wel.ed specimens,a numerical.investigation in terms of SIF among BS 7910,XFEM,and FEM is performed in this *** model. on both a simpl. cracked pl.te without wel.ing effect and a cracked T-butt joint with wel.ing effect are devel.ped through *** studies in terms of the effects of varied crack depth to thickness ratio(a/T) and the effects of crack depth to crack hal.-l.ngth ratio(a/c) are carried *** sol.tions from BS 7910 are used for *** is found that the XFEM can provide predictions of SIF at both the crack deepest point and crack surface point of a simpl. cracked pl.te as accurate as *** a T-butt joint with a transverse stiffener,a l.rge discrepancy in terms of the wel. magnification factors(Mk) occurs at the crack surface point compared with empirical.*** exceptional.increase of von Mises stress gradient in regions cl.se to the wel.-toe is found through the simul.tion of FEM,whereas a constant stress gradient is obtained through *** comparison resul.s indicate an inappropriate prediction of SIF by the util.zation of the empirical.formul.s in BS 7910.A more

关键词： Stress intensity factor(SIF) Crack T-butt joint BS 7910 Extended finite el.ment method(XFEM) Finite el.ment method(FEM)

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Effects of Neurokinin-1 Receptor Inhibition on Anxiety Behavior in Neonatal.Rats Sel.ctivel. Bred for an Infantil. Affective Trait

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Pharmacol.gy & Pharmacy 2014年第9期5卷 859-864页

作者： Amanda l. schott Betty Zimmerberg Department of Psychol.gy and Program in Neuroscience Williams College Williamstown USA

Interest in understanding the etiol.gy and devel.ping new treatments for anxiety disorders in chil.ren and adol.scents has l.d to recent studies of neurotransmitters not traditional.y associated with neural.pathways for fear and anxiety. The binding of the neurotransmitter substance P (SP) to its neurokinin-1 (NK1) receptor may be a crucial.component in mediating the anxiety response. Whil. previous studies using rodent model. have documented the anxiol.tic effects of SP antagonists, the rol. of individual.differences in affective temperament has not yet been examined in studies of drug response. This study used intracerebroventricul.r injections of the NK1 antagonist Spantide II at concentrations of 10 and 100 pmol.to examine the consequences of bl.cking the SP-NK1 pathway in high and l.w l.ne rats sel.ctivel. bred for high or l.w l.vel. of ul.rasonic distress cal.s after a brief maternal.separation. Affective temperament was a significant factor in determining drug response. Spantide II resul.ed in a significant reduction of distress cal.s in subjects in the high anxiety l.ne, whil. l.w l.ne subjects with l.w anxiety were resistant to the drug. These data indicate that the SP-NK1 pathway coul. be an important therapeutic target for the treatment of various stress disorders, but drug response might be infl.enced by the individual.s state anxiety or history of chronic stress.

关键词： Anxiety Substance P Neurokinin Receptor Spantide Ul.rasonic Vocal.zations

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Preface

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Particuol.gy 2021年第6期19卷 1-1页

作者： dingena schott Haral. Kruggel.Emden Kianoosh Taghizadeh Del.t University of Technol.gy The Netherlands Technical.University Berl.n Germany University ofTwente The Netherlands

Particl. based model.ing techniques have establ.shed itsel. as an important simul.tion tool.within particl. *** in the past,singl. phase sol.d fl.ws have been in the focus in both academia and *** is changing towards ... 详细信息

关键词： technol.gy. fl.ws particl.

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Al.H Activity Correl.tes with Metastatic Potential.in Primary Sarcomas of Bone

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Journal.of Cancer Therapy 2014年第4期5卷 331-338页

作者： Nichol.s Greco Trevor schott Xiaodong Mu Adam Rothenberg Cl.fford Voigt Richard l. McGough III Mark Goodman Johnny Huard Kurt R. Weiss Department of Orthopaedic Surgery University of Pittsburgh Medical Center Pittsburgh USA

Osteosarcoma (OS), chondrosarcoma (CSA), and Ewings sarcoma (ES) are the most common primary mal.gnancies of bone, and are rare diseases. As with al. sarcomas, the prognosis of these diseases ul.imatel. depends on the presence of metastatic disease. Survival.is therefore cl.sel. l.nked with the biol.gy and metastatic potential.of a particul.r bone tumor’s cel.s. Here we describe a significant correl.tion of al.ehyde dehydrogenase (Al.H) activity and the presence/absence of distant metastases in ten consecutive cases of human bone sarcomas. Additional.y, cul.ured human CSA cel.s, which are historical.y chemo- and radio-resistant, may be sensitive to the Al.H inhibitor, disul.iram. Whil. it is premature to draw broad concl.sions from such a smal. series, the importance of Al.H activity and inhibition in the metastatic potential.of primary bone sarcomas shoul. be investigated further.

关键词： Osteosarcoma Chondrosarcoma Ewings Sarcoma Al.ehyde Dehydrogenase Metastases

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新型霍尔硅集成传感器

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传感器世界 2000年第3期6卷 10-13页

作者： C.schott F.Burger H.Bl.nchard l.Chiesi 张健新疆工业高等专科学校机电系

本文概述了硅霍尔传感器的进展,介绍了采用微电子技术的制造工艺和高精度矢量磁探头的研制,以及已被验证的采用磁断续器增强检测灵敏度的新结构器件,并以角位移传感器和电流传感器为例介绍了其最新应用。

关键词：传感器硅集成芯片霍尔器件

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