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Shape-changing particles for locally resolved particle geometry in DEM simulations

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Particuology 2024年第6期89卷 185-190页

作者： Enric Illana Klidi Qyteti maik scharnowski Maximilian Brömmer Siegmar Wirtz Viktor Scherer Institute of Energy Plant Technology Ruhr-University BochumBochumGermany

Taking into account the complex shape of particles in discrete element method (DEM) simulations of large-scale granular systems is computationally demanding due to the time-consuming contact detection algorithms for polyhedral particles. In this short communication, a novel approach that locally resolves the particle shapes where needed and uses a simplified representation elsewhere, to accelerate simulations without compromising accuracy, is presented. For this purpose, a method employing a smooth transition of the particle shape representation from analytical spheres to shape-resolving polyhedra is introduced in DEM. The feasibility and correct implementation of this approach are demonstrated through simulations of hopper discharge involving spherical and dodecahedral particles from a flat bottom silo or shaft kiln. The model capabilities, in terms of accuracy as well as reduction in computational effort, are quantified for a moving bed with continuous outflow.

关键词： Polyhedron Size change Shape change Locally resolved DEM

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橡胶串联混炼技术提效节能分析

中国橡胶 2024年第S1期 16-21页

作者：车沛懿 Lukas Hermeling maik Rinker 青岛海福乐机械设备有限公司 HF mixing集团公司

近年来，不断上涨的电力和能源成本，已经成为工业企业日益沉重的负担，其原因包括公共卫生事件、局部区域冲突，以及气候保护、节能降耗等。因此，企业必须不断优化和调整自身的生产工艺流程，同时还需引进技术以提升产品质量和经济效...

近年来，不断上涨的电力和能源成本，已经成为工业企业日益沉重的负担，其原因包括公共卫生事件、局部区域冲突，以及气候保护、节能降耗等。因此，企业必须不断优化和调整自身的生产工艺流程，同时还需引进技术以提升产品质量和经济效益。轮胎生产商和橡胶制品企业越来越多地从能源角度审视和优化生产流程。串联混炼技术是提高能源效率的一种可行方式。

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Secured ECG Signal Transmission Using Optimized EGC with Chaotic Neural Network in WBSN

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Computer Systems Science & Engineering 2023年第2期44卷 1109-1123页

作者： Ishani Mishra Sanjay Jain Vivek maik Department of ECE New Horizon College of EngineeringBengaluru560103India CMR Institute of Technology Bengaluru560037India SRM University Chennai603203India

In wireless body sensor network(WBSN),the set of electrocardiogram(ECG)data which is collected from sensor nodes and transmitted to the server remotely supports the experts to monitor the health of a *** transmit-ting these collected data some adversaries may capture and misuse it due to the compromise of ***,the major aim of this work is to enhance secure trans-mission of ECG signal in *** attain this goal,we present Pity Beetle Swarm Optimization Algorithm(PBOA)based Elliptic Galois Cryptography(EGC)with Chaotic Neural *** optimize the key generation process in Elliptic Curve Cryptography(ECC)over Galoisﬁeld or EGC,private key is chosen optimally using PBOA *** the encryption process is enhanced by presenting chaotic neural network which is used to generate chaotic sequences or cipher *** of this work show that the proposed cryptogra-phy algorithm attains better encryption time,decryption time,throughput and SNR than the conventional cryptography algorithms.

关键词： Wireless body sensor network ECG pity beetle swarm optimization algorithm elliptic galois cryptography and chaotic neural network

Secure and Optimal LOADng Routing for IoT with Composite RoutingMetric

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Computers, Materials & Continua 2023年第1期74卷 655-669页

作者： Divya Sharma Sanjay Jain Vivek maik Department of Electronics and Communication New Horizon College of EngineeringBengaluru560103India CMR Institute of Technology Bengaluru560037India Department of Electronics and Communication SRM Institute of Science and TechnologyKattankulathurChennai603203India

Security is the one of the major challenges for routing the data between the source and destination in an Internet of Things(IoT)*** overcome this challenge,a secure Lightweight On-demand Ad hoc Distancevector—Next Generation(LOADng)Routing Protocol is proposed in this *** the LOADng protocol is the second version of Ad Hoc On-Demand Distance Vector(AODV)protocol,it retains most of the basic functionality and characteristics of *** the route discovery process,the cyclic shift transposition algorithm(CSTA)is used to encrypt the control packets of the LOADng protocol to improve its *** approach only derives transposition and substitution without product cipher with respect to input *** this,for choosing the best probable path between the source and destination,routing metrics such as link quality Indicator(LQI),hop count(HC)and queue length(QL)are included in the control *** data is then securely sent using CSTA using the optimal secure path *** Results depict that the proposed secure and optimal LOADng(SO-LOADng)using CSTA encryption obtains better throughput,delivery ratio encryption time and decryption time than the existing state-ofart approaches.

关键词： IoT LOADng CSTA link quality indicator queue length

Optimized Tuning of LOADng Routing Protocol Parameters for IoT

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Computer Systems Science & Engineering 2023年第8期46卷 1549-1561页

Interconnected devices and intelligent applications have slashed human intervention in the Internet of Things(IoT),making it possible to accomplish tasks with less human ***,it faces many problems,including lower capacity links,energy utilization,enhancement of resources and limited resources due to its openness,heterogeneity,limited resources and *** is challenging to route packets in such a constrained *** an IoT network constrained by limited resources,minimal routing control overhead is required without packet *** constrained environments can be improved through the optimal routing *** is challenging to route packets in such a constrained ***,this work is motivated to present an efficient routing protocol for enhancing the lifetime of the IoT *** On-demand Ad hoc Distance-vector Routing Protocol—Next Generation(LOADng)protocol is an extended version of the Ad Hoc On-Demand Distance Vector(AODV)*** AODV,LOADng is a lighter version that forbids the intermediate nodes on the route to send a route reply(RREP)for the route request(RREQ),which originated from the source.A resource-constrained IoT network demands minimal routing control overhead and faster packet ***,in this paper,the parameters of the LOADng routing protocol are optimized using the black widow optimization(BWO)algorithm to reduce the control overhead and ***,the performance of the proposed model is analyzed with the default LOADng in terms of delay,delivery ratio and *** results show that the LOADng-BWO protocol outperforms the conventional LOADng protocol.

关键词： Internet of things optimization algorithm routing protocol LOADng

Scalable fabrication,compartmentalization and applications of living microtissues

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Bioactive Materials 2023年第1期19卷 392-405页

作者： maik Schot Nuno Araújo-Gomes Bas van Loo Tom Kamperman Jeroen Leijten Department of Developmental Bioengineering Faculty of Science and TechnologyTechnical Medical CentreUniversity of TwenteDrienerlolaan 57522NBEnschedethe Netherlands

Living microtissues are used in a multitude of applications as they more closely resemble native tissue physiology,as compared to 2D *** are typically composed of a combination of cells and materials in varying combinations,which are dictated by the applications’design *** applications range wide,from fundamental biological research such as differentiation studies to industrial applications such as cruelty-free meat ***,their translation to industrial and clinical settings has been hindered due to the lack of scalability of microtissue production *** microfluidic processes provide an opportunity to overcome this limitation as they offer higher throughput production rates as compared to traditional batch techniques,while maintaining reproducible control over microtissue composition and *** this review,we provide a comprehensive overview of the current approaches to engineer microtissues with a focus on the advantages of,and need for,the use of continuous processes to produce microtissues in large ***,an outlook is provided that outlines the required developments to enable large-scale microtissue fabrication using continuous processes.

关键词： Tissue engineering Micromaterials Microfluidics Upscaling Clinical translation Industrial translation

Melting of hydrous pyroxenites with alkali amphiboles in the continental mantle:*** relations and major element compositions of melts

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Geoscience Frontiers 2022年第4期13卷 48-74页

作者： Stephen F.Foley Isra S.Ezad Sieger R.van der Laan maik Pertermann School of Natural Sciences Macquarie UniversityNorth RydeNew South Wales 2109Australia Research School of Earth Sciences Australian National UniversityCanberraACT 2601Australia Tata Steel Europe Research and DevelopmentIjmuidenThe Netherlands Coos Bay OregonUSA

Melting experiments on ultramafic rocks rich in the hydrous minerals phlogopite or phlogopite+K-rich terite,some including 5%of accessory phases,have been conducted at 15 and 50 *** assemblages represent probable source components that contribute to melts in cratonic regions,but whose melt compositions are poorly known.A main series of starting compositions based on MARID xenoliths consisted of a third each of clinopyroxene(CPX),phlogopite(PHL)and K-richterite(KR)with or without 5%ilmenite,rutile or *** experiments were run without KR and with higher proportions of accessory *** traps were used at near-solidus temperatures to facilitate accurate analysis of wellquenched melts,for which reversal experiments demonstrate *** show that KR melts rapidly and completely within 50°C of the solidus,so that melts reflect the composition of the amphibole and its melting *** have high SiO_(2) and especially K_(2)O but low CaO and Al_(2)O_(3) relative to basaltic melts produced from peridotites at similar *** have no counterparts amongst natural rocks,but most closely resemble leucite lamproites at 15 *** and PHL melt incongruently to form olivine(OL)and CPX at 15 kbar,promoting SiO2 contents of the melt,whereas orthopyroxene OPX is increasingly stable at lower lithosphere pressures,leading to an increase in Mg O and decrease in SiO_(2) in melts,which resemble olivine *** of mica pyroxenites without KR are richer in CaO and Al_(2)O_(3) and do not resemble *** experiments show that low CaO and Al_(2)O_(3) in igneous rocks is not necessarily a sign of a depleted peridotite *** phases produce melts exceptionally rich in P_(2)O_(5) or TiO_(2) depending on the phases present and are unlike any melts seen at the Earth’s surface,but may be important agents of metasomatism seen in *** addition of the 5%accessory phases ilmenite,rutile or apatite result in melting temper

关键词： Hydrous pyroxenite Experimental petrology Mantle melts Phlogopite Lamproite Mantle metasomatism

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Auxin-Oxylipin Crosstalk:Relationship of Antagonists

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Journal of Integrative Plant Biology 2011年第6期53卷 429-445页

作者： maik Hoffmann Mathias Hentrich Stephan Pollmann Centro de Biotecnología y Genómica de Plantas(U.P.M.-I.N.I.A.) Parque Científico y Tecnológico de la U.P.M. Campus de Montegancedo Ruhr-Universitt Bochum Lehrstuhl fr PflanzenphysiologieUniversittsstrasse

Phytohormones regulate a wide array of developmental processes throughout the life cycle of plants. Herein, the various plant hormones may interact additively, synergistically, or antagonistically. By their cooperation they create a delicate regulatory network whose net output largely depends on the action of specific phytohormone combinations rather than on the independent activities of separate hormones. While most classical studies of plant hormonal control have focused mainly on the action of single hormones or on the synergistic interaction of hormones in regulating various developmental processes, recent work is beginning to shed light on the crosstalk of nominally antagonistic plant hormones, such as gibberellins and auxins with oxylipins or abscisic acid. In this review, we summarize our current understanding of how two of the first sight antagonistic plant hormones, i.e. auxins and oxylipins, interact in controlling plant responses and development.

关键词： Auxin biosynthesis crosstalk hormone jasmonic acid.

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Spent coffee ground as source for hydrocarbon fuels

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Journal of Energy Chemistry 2016年第1期25卷 146-152页

作者： Peter Döhlert maik Weidauer Stephan Enthalera Technische Universitat Berlin Department of ChemistryCluster of Excellence"Unifying Concepts in Catalysis"Straβe des 17.Juni 135/C2D-10623 BerlinGermany Universitat Hamburg Department of ChemistryMartin-Luther-King-Platz 6D-20146 HamburgGermany

The conversion of triglycerides（coffee oil） obtained from spent coffee ground to produce hydrocarbon fuel（diesel） was studied. In more detail, a catalytic hydrodeoxygenation of the coffee oil was performed applying polymethylhydrosiloxane（PMHS） as cheap reductant under mild reaction conditions. However, along with the hydrocarbons significant amounts of PMHS-waste are generated, since only～1.7% of the PMHS is required for the reduction process. Based on that, in a subsequent depolymerization step the PMHS-waste was converted to methyltrifluorosilane and difluoromethylsilane, which can be applied as building blocks for the production of new silicones, with boron trifluoride diethyl etherate（BF3OEt2） as depolymerization reagent.

关键词： Catalysis Triglyceride Hydrocarbons Hydrodeoxygenation Depolymerization

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