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Experimental and numerical investigation to elucidate the fluid flow through packed beds with structured particle packings

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Particuology 2024年第6期89卷 218-237页

作者： Shirin Patil Christian Gorges joel Lòpez Bonilla Moritz Stelter Frank Beyrau Berend van wachem Laboratory of Technical Thermodynamics Otto-von-Guericke-Universität MagdeburgUniversitätsplatz 239106 MagdeburgGermany Chair of Mechanical Process Engineering Otto-von-Guericke-Universität MagdeburgUniversitätsplatz 239106 MagdeburgGermany

The present paper presents an experimental and numerical investigation of the dispersion of the gaseous jet flow and co-flow for the simple unit cell(SUC)and body-centred cubic(BCC)configuration of particles in packed *** experimental setup is built in such a way that suitable and simplified boundary conditions are imposed for the corresponding numerical framework,so the simulations can be done under very similar conditions as the ***,a porous plate is used for the co-flow to achieve the uniform velocity and the fully developed flow is ensured for the jet *** SUC and BCC particle beds consist of 3D-printed spheres,and the non-isotropy near the walls is mostly eliminated by placing half-spheres at the channel *** flow velocities are analysed directly at the exit of the particle bed for both beds over 36 pores for the SUC configuration and 60 pores for the BCC configuration,for particle Reynolds numbers of 200,300,and *** particle image velocimetry is experimentally arranged in such a way that the velocities over the entire region at the exit of the packed bed are obtained *** numerical method consists of a state-of-the-art immersed boundary method with adaptive mesh *** paper presents the pore jet structure and velocity field exiting from each pore for the SUC and BCC packed particle *** numerical and experimental studies show a good agreement for the SUC configuration for all flow *** the BCC configuration,some differences can be observed in the pore jet flow structure between the simulations and the experiments,but the general flow velocity distribution shows a good overall *** axial velocity is generally higher for the pores located near the centre of the packed bed than for the pores near the *** addition,the axial velocities are observed to increase near the peripheral pores of the packed *** behaviour is predominant for the BCC configuration as compared to t

关键词： Uniform particle packing Packed bed reactor Stereo particle image velocimetry Immersed boundary method

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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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Everything is Primitive Accumulation?

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Fudan Journal of the Humanities and Social Sciences 2024年第2期17卷 337-360页

作者： David S.Pena joel wendland-Liu Palm Beach State College Palm Beach GardensFLUSA Grand Valley State University AllendaleMIUSA

This paper explores the Marxist concept of primitive accumulation and its relationship to capitalist development. Primitive accumulation occurs as a historical process before the complete emergence of capitalism as the dominant mode of production. Primitive accumulation is distinguished from other forms of exploitation employed by capitalist societies to spread capitalism into non-capitalist regions. An exploration of different interpretations of primitive accumulation within Marxist theory highlights the transition from primary accumulation to capitalist accumulation in specific contexts. This paper provides a comprehensive overview of the multifaceted nature of primitive accumulation and its significance in the development of capitalism. It argues that many uses of primitive accumulation in the present context are erroneous.

关键词： Marxism Primitive accumulation Origins of capitalism Political economy

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Size and crystallinity effect on the ultrafast optical response of chemically synthesized silver nanoparticles

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Journal of Materiomics 2024年第3期10卷 594-600页

作者： Nadzeya khinevich Domantas Peckus Asta Tamuleviciene Gerda klimaite joel Henzie Tomas Tamulevicius Sigitas Tamulevicius Institute of Materials Science of kaunas University of Technology K.Barsausko St.59LT-51423KaunasLithuania Department of Physics Kaunas University of TechnologyStudentu˛St.50LT-51368KaunasLithuania International Center for Materials Nanoarchitectonics(wPI-MANA) National Institute for Materials Science(NIMS)Tsukuba305-0044Japan

The excited localized surface plasmon(LSP)in metallic nanoparticles is known to relax through several processes such as electron-electron scattering,electron-phonon coupling,and phonon-phonon *** the current research,the ultrafast electron-phonon(e-ph)coupling relaxation processes for different average sizes and crystallinity of chemically synthesized silver nanoparticles were evaluated utilizing transient absorption *** nanoparticle size and crystallinity of similar linear dimension polycrystalline spherical and monocrystalline cubic nanoparticles ranging from ca.30-60 nm was related to their electron relaxation time constants and revealed very different *** the monocrystalline nanocubes,the electron-phonon coupling was not dependent on the cube edge length,while for the polycrystalline nanospheres,it was linearly decreasing with *** demonstrate that the e-ph coupling time constant could be used to evaluate crystallinity and crystallite size in plasmonic metal nanoparticles when the size(surface area)of the nanoparticle is known.

关键词： Silver nanospheres Silver nanocubes Electron-phonon coupling Transient absorption spectroscopy Crystallite size Polycrystalline structure

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Hydrogeochemical and isotopic assessment of the origin of NO_(3)^(−)and N-NH_(3)contents in the aquifer located in a closed lacustrine volcano-sedimentary basin in the metropolitan area of Mexico City

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Acta Geochimica 2024年第4期43卷 719-736页

作者： Jose Ivan Morales-Arredondo Maria Aurora Armienta Hernandez joel Edmundo Ortega-Gutierrez Elisa Cuellar Ramirez Natural Resources Department Institute of GeophysicsNational Autonomous University of MexicoCiudad Universitaria No.3000Col.Copilco UniversidadCoyoacán Delegation04360 MexicoCDMXMexico Instituto Politecnico Nacional ***án 55La Laguna Ticoman07340 MexicoCDMXMexico Benemérita Universidad Autónoma de Puebla Ciudad Universitaria Col.San ManuelPueblaPueMexico

To explain the presence and spatial distribution of NO_(3)^(−)and N-NH_(3)in the Aquifer of the Metropolitan Area of Mexico City(AMAMC),a hydrogeochemical and isotopic analysis using^(13)C DIC(as well as the stable isotopes^(18)O and^(2)H)in groundwater was *** aquifer is located in an old closed lacustrine volcano-sedimentary basin;some wells hosted in the semi-confined zone contain high N-NH_(3)concentrations,while others present NO_(3)^(−)contents in the recharge zones(hosted in an oxidizing environment).In this study,a change in the isotopic signature(primarily in^(18)O and^(2)H)was observed from the recharge zones to the basin center in some of the wells with high NO_(3)^(−)concentrations,this behavior can be attributed to evaporation during the incorporation of recently infiltrated *** addition,the results for^(13)C(along with ^(2) H)in wells with the highest N-NH_(3)concentrations exhibited an atypically broad range of *** indicated the occurrence of hydrogeochemical and/or biochemical processes in the aquifer(in an oxidizing or reducing environment),such as organic degradation,bacterial decomposition(primarily in the ancient Lake Texcoco and which acts as a natural sink for carbon,nitrogen,sulfur,and phosphorus),besides rock weathering and dissolution,which may be responsible for a very marked isotopic modification of the^(13)C(and,to a lesser extent,2 H).Methanotrophic bacterial activity and methanogenic activity may be related to N-NH_(3)removal processes by oxidation and residual water incorporation respectively,whereas the increase in the NO_(3)^(−)content in some wells is due to the recent contribution of poor-quality water due to contamination.

关键词： 18 O and^(13)C isotopes Iron Hydrogeochemical processes Nitrate Nitrogen species

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Synergistic redox reactions toward co-production of H_(2)O_(2)and value-added chemicals:Dual-functional photocatalysis to achieving sustainability

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SusMat 2024年第3期4卷 36-72页

作者： Brenden Jing Su joel Jie Foo Grayson Zhi Sheng Ling wee-Jun Ong School of Energy and Chemical Engineering Xiamen University MalaysiaSelangor Darul EhsanMalaysia Center of Excellence for NaNo Energy&Catalysis Technology Xiamen University MalaysiaSelangor Darul EhsanMalaysia State key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamenChina Gulei Innovation Institute Xiamen UniversityZhangzhouChina Shenzhen Research Institute Xiamen UniversityShenzhenChina

IntegratingH_(2)O_(2)evolution with oxidative organic synthesis in a semiconductordriven photoredox reaction is highly attractive since H_(2)O_(2)and high-value chemicals can be concurrently produced using solar light as the only energy *** dual-functional photocatalytic approach,free from sacrificial agents,enables simultaneous production of H_(2)O_(2)and high-value organic *** strategy promises a green and sustainable organic synthesis with minimal greenhouse gas *** this review,we first elucidate the fundamental principles of cooperative photoredox integration of H_(2)O_(2)synthesis and selective organic oxidation with simultaneous utilization of photoexcited electrons and holes over semiconductor-based ***,a thorough review on the recent advancements of cooperative photoredox synthesis of H_(2)O_(2)and value-added chemicals is ***,in-depth discussions and insights into the techniques for unravelling the photoredox reaction mechanisms are ***,critical challenges and prospects in this thriving field are comprehensively *** is envisioned that this review will serve as a pivotal guidance on the rational design of such dual-functional photocatalytic system,thereby further stimulating the development of economical and environmentally benignH_(2)O_(2)and high-value chemicals production.

关键词： cooperative photoredox synthesis dual-functional photocatalysts H_(2)O_(2) photocatalysis selective organic oxidation

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The “Dead Universe” Theory: Natural Separation of Galaxies Driven by the Remnants of a Supermassive Dead Universe

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Natural Science 2024年第6期16卷 65-101页

作者： joel Almeida Department of Theology and Metaphysics UniFil University Curitiba Brazil

This article explores the dead universe theory as a novel interpretation for the origin and evolution of the universe, suggesting that our cosmos may have originated from the remnants of a preceding universe. This perspective challenges the conventional Big Bang theory, particularly concerning dark matter, the expansion of the universe, and the interpretation of phenomena such as gravitational waves.

关键词： Dead Universe Theory Heat Death of the Universe Big Bang Theory Universe’s Ultimate Fate Universe Expansion Big Freeze Universe Cosmological Models End of Universe Theories Natural Galaxy Drift Future of the Universe Universe Cooling Down Cosmology and Entropy

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wheat zinc finger protein TaZF interacts with both the powdery mildew AvrPm2 protein and the corresponding wheat Pm2a immune receptor

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Plant Communications 2024年第5期5卷 25-41页

作者： Beatrice Manser Helen Zbinden Gerhard Herren joel Steger Jonatan Isaksson Stephanie Braunlich Thomas wicker Beat keller Department of Plant and Microbial Biology University of ZurichZollikerstrasse 1078008 ZurichSwitzerland Agroscope Route de Duillier 501260 NyonSwitzerland BIOREBA AG Christoph Merian-Ring 74153 ReinachSwitzerland

Plant defense responses to pathogens are induced after direct or indirect perception of effector proteins or their activity on host *** fungal–plant interactions,relatively little is known about whether,in addi-tion to avirulence effectors and immune receptors,other proteins contribute to specific *** nucleotide-binding leucine-rich repeat(NLR)immune receptor Pm2a in wheat recognizes the fungal pow-dery mildew effector *** found that the predicted wheat zincfinger TaZF interacts with both the fungal avirulence protein AvrPm2 and the wheat NLR *** further demonstrated that the virulent AvrPm2-H2 variant does not interact with *** silencing in wheat resulted in a reduction but not a loss of Pm2a-mediated powdery mildew *** studies showed that the leucine-rich repeat domain of Pm2a is the mediator of the interaction with *** recruits both Pm2a and AvrPm2 from the cytosol to the nucleus,resulting in nuclear localization of Pm2a,TaZF,and AvrPm2 in *** propose that TaZF acts as a facilitator of Pm2a-dependent AvrPm2 effector *** highlight the importance of identifying effector host targets for characterization of NLR-mediated effector recognition.

关键词： plant immunity plant-fungal interactions pathogen effectors nucleotide-binding leucine-rich repeat immune receptor NLR wheat powdery mildew

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General practice trainee,supervisor and educator perspectives on the transitions in postgraduate training:a scoping review

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Family Medicine and Community Health 2024年第4期12卷 17-28页

作者： Michael Tran joel Rhee wendy Hu Parker Magin Boaz Shulruf Discipline of General Practice School of Clinical MedicineUniversity of New South WalesSydneyNew South WalesAustralia School of Medicine Western Sydney UniversitySydneyNew South WalesAustralia Discipline of General Practice School of Medicine and Public HealthThe University of NewcastleNewcastleNew South WalesAustralia Office of Medical Education University of New South WalesSydneyNew South WalesAustralia

Transitions are a period and a process,through which there is a longitudinal adaptation in response to changing circumstances in clinical practice and *** the experience of the transition in medical student learning and in hospital-based specialty training programmes are well described and researched,the experience of the transition in community-based postgraduate general practitioner(GP)training has not been described *** we aimed to identify,and categorise,the formative experiences of transitions in GP training and their impacts on personal and professional *** we adopted Levac et al’s scoping review *** 1543 retrieved records,76 were selected for data *** on a combined model of the socioecological and multiple and multi-dimensional theories of transitions,data relating to the experiences of transitions were organised into contextual themes:being physical,psychosocial,organisational culture and *** criteria Empirical studies focused on general practice trainees or training,that discussed the transitions experienced in general practice training and that were published in English were *** sources PubMed,MEDLINE and web of Science databases were searched in January 2024 with no date limits for empirical studies on the transition experiences of GP into,and through,*** Our findings describe context-dependent formative experiences which advance,or impede,learning and *** is a significant modulator of the factors contributing to more negative experiences,with some initially adverse experiences becoming more *** of the inflection point that represents a shift from initially adverse to more positive experiences of transitions may help moderate expectations for learning and performance at different stages of *** Challenges in training can either advance development and contribute positively to pr

关键词： finding initially programme

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Characterizations That Help Explain Particle and Cosmic Data

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Journal of High Energy Physics, Gravitation and Cosmology 2024年第3期10卷 1304-1357页

作者： Thomas joel Buckholtz Ronin Institute for Independent Scholarship Montclair USA

This paper suggests explanations for otherwise seemingly unexplained data about elementary particles and cosmology. The explanations have bases in coordinate-based modeling and in integer-based characterizations for some catalogs. One catalog features properties—including charge, mass, and angular momentum—of objects. Another catalog features all known and some possible elementary particles. Assumptions include that multipole-expansion mathematics has uses regarding long-range interactions, such as gravity, and that nature includes six isomers of all elementary particles other than long-range-interaction bosons. One isomer associates with ordinary matter. Five isomers are associated with dark matter. Multipole notions help explain large-scale aspects such as the rate of expansion of the universe.

关键词： Elementary Particles Dark Matter Rate of Expansion of the Universe Galaxy Formation Neutrino Masses Vacuum Energy Dark Energy Quantum Gravity

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