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A Novel Approach to Predict the Stability Limits of Combustion Chambers with Large Eddy Simulation

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Journal of Thermal Science 2010年第3期19卷 261-265页

作者： b.pritz F.Magagnato M.Gabi Department of Fluid Machinery University of Karlsruhe Kaiserstr.1276131 KarlsruheGermany

Lean premixed combustion,which allows for reducing the production of thermal NOx,is prone to combustion *** is an extensive research to develop a reduced physical model,which allows-without time-consuming measurements-to calculate the resonance characteristics of a combustion system consisting of Helmholtz resonator type components (burner plenum,combustion chamber).For the formulation of this model numerical investigations by means of compressible Large Eddy Simulation (LES) were carried *** these investigations the flow in the combustion chamber is isotherm,non-reacting and excited with a sinusoidal mass flow *** a combustion chamber as a single resonator subsequently a coupled system of a burner plenum and a combustion chamber were *** this paper the results of additional investigations of the single resonator are *** flow in the combustion chamber was investigated without excitation at the *** was detected,that the mass flow rate at the outlet cross section is pulsating once the flow in the chamber is *** fast Fourier transform of the signal showed that the dominant mode is at the resonance frequency of the combustion *** result sheds light on a very important source of self-excited combustion *** the LES can provide not only the damping ratio for the analytical model but the eigenfrequency of the resonator also.

关键词： compressible large-eddy simulation combustion instabilities oscillating flow damping ratio

Prediction of the Resonance Characteristics of Combustion Chambers on the basis of Large-Eddy Simulation

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Journal of Thermal Science 2005年第2期14卷 156-161页

作者： Franco MAGAGNATO balázs pritz Horst bCHNER Martin GAbI Department of Fluid Machinery University of Karlsruhe GermanyDepartment of Fluid Machinery University of KarlsruheGermanyEngler-Bunte-Institute/Division for Combustion Technology University of KarlsruheGermanyDepartment of Fluid Machinery University of KarlsruheGermany

In the last few years intensive experimental investigations were performed at the University of Karlsruhe to develop an analytical model for the Helmholtz resonator-type combustion system. In the present work the resonance characteristics of a Helmholtz resonator-type combustion chamber were investigated using large-eddy simulations (LES), to understand better the flow effects in the chamber and to localize the dissipation. In this paper the results of the LES are presented, which show good agreement with the experiments. The comparison of the LES study with the experiments sheds light on the significant role of the wall roughness in the exhaust gas pipe.

关键词： compressible large-eddy simulation combustion instabilities oscillating flow damping ratio.

Numerical Investigation of the Flow inside the Combustion Chamber of a Plant Oil Stove

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Journal of Thermal Science 2013年第5期22卷 491-496页

作者： b. pritz M. Werler H. Wirbser M. Gabi Institute of Fluid Machinery Karlsruhe Institute of Technology (KIT)Kaiserstr. 12 76131 Karlsruhe Germany Institute of Technical Thermodynamics KITKaiserstr. 12 76131 Karlsruhe Germany

Recently a low cost cooking device for developing and emerging countries was developed at KIT in cooperation with the company bosch und Siemens Hausger^ite GmbH. After constructing an innovative basic design further development was required. Numerical investigations were conducted in order to investigate the flow inside the combustion chamber of the stove under variation of different geometrical parameters. beyond the performance improvement a further reason of the investigations was to rate the effects of manufacturing tolerance problems. In this paper the numerical investigation of a plant oil stove by means of RANS simulation will be presented. In or- der to reduce the computational costs different model reduction steps were necessary. The simulation results of the basic configuration compare very well with experimental measurements and problematic behaviors of the ac- tual stove design could be explained by the investigation.

关键词： plant oil stove cooking device fuel evaporation combustion chamber CFD RANS

Neuroinflammation revisited through the microglial lens

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Neural Regeneration Research 2025年第7期20卷 1989-1990页

作者： Renato Socodato João b.Relvas Institute of Research and Innovation in Health(i3S)and Institute for Molecular and Cell biology(IbMC) University of PortoPortoPortugal Department of biomedicine Faculty of Medicine of the University of Porto(FMUP)PortoPortugal

Neuroimmunology is emerging as a pivotal field,shedding light on the intricate dialogues between the central nervous system(CNS)and the immune *** exploration is particularly significant in understanding microglia,the CNS’s innate immune cells,beyond the conventional conflation of“neuroinflammation”and“microglial activation.”This conflation has clouded the true complexity of these processes,potentially stalling scientific progress and the development of new *** challenge the long-standing perspectives that have oversimplified these interactions,advocating for a deeper exploration of the dynamic relationship between neuroinflammation and microglial *** dissecting specific molecular pathways,we aim to illuminate their elaborate roles in neuroinflammatory responses,especially in the context of Alzheimer’s disease(AD).Here,neuroinflammation is not merely a passive observer or a direct antagonist but a complex agent in the disease’s *** article calls for a significant paradigm shift towards an integrative,multi-omics approach to *** such a comprehensive framework is crucial for advancing our understanding of neuroinflammatory conditions and paving the way for targeted therapeutic strategies for brain diseases.

关键词： inflammation simplified activation

Machine learning in solid organ transplantation:Charting the evolving landscape

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World Journal of Transplantation 2025年第1期15卷 165-177页

作者： badi Rawashdeh Haneen Al-abdallat Emre Arpali beje Thomas Ty b Dunn Matthew Cooper Division of Transplant Surgery Medical College of WisconsinMilwaukeeWI 53202United States Department of Medicine Jordan University HospitalAmman 11263Jordan Department of Nephrology Medical College of WisconsinMilwaukeeWI 53226United States

bACKGROUND Machine learning(ML),a major branch of artificial intelligence,has not only demonstrated the potential to significantly improve numerous sectors of healthcare but has also made significant contributions to the field of solid organ *** provides revolutionary opportunities in areas such as donorrecipient matching,post-transplant monitoring,and patient care by automatically analyzing large amounts of data,identifying patterns,and forecasting *** To conduct a comprehensive bibliometric analysis of publications on the use of ML in transplantation to understand current research trends and their *** On July 18,a thorough search strategy was used with the Web of Science *** and transplantation-related keywords were *** the aid of the VOS viewer application,the identified articles were subjected to bibliometric variable analysis in order to determine publication counts,citation counts,contributing countries,and institutions,among other *** Of the 529 articles that were first identified,427 were deemed relevant for bibliometric analysis.A surge in publications was observed over the last four years,especially after 2018,signifying growing interest in this *** 209 publications,the United States emerged as the top ***,the"Journal of Heart and Lung Transplantation"and the"American Journal of Transplantation"emerged as the leading journals,publishing the highest number of relevant *** keyword searches revealed that patient survival,mortality,outcomes,allocation,and risk assessment were significant themes of *** The growing body of pertinent publications highlights ML's growing presence in the field of solid organ *** bibliometric analysis highlights the growing importance of ML in transplant research and highlights its exciting potential to change medical practices and enhance patient *** collaboration between signific

关键词： Machine learning Artificial Intelligence Solid organ transplantation bibliometric analysis

Compact embedding in besov spaces and b-separable elleptic operators

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Science China Mathematics 2010年第4期53卷 1067-1084页

作者： SHAKHMUROV Veli b. Department of Electronics Engineering and Communication Okan University

Necessary and sufficient conditions for compactness of sets in banach space valued besov class bp,q s(Ω;E) is *** embedding theorems in besov-Lions type spaces b l,s p,q(Ω;E0,E) are studied,where E0,E are two banach spaces and E 0  *** most regular class of interpolation space E α,between E 0 and E are found such that the mixed differential operator D α is bounded and compact from b p,q l,s (Ω;E 0,E) to b p,q s (Ω;E α) and Ehrling-Nirenberg-Gagliardo type sharp estimates *** using these results the separability of differential operators with variable coefficients and the maximal b-regularity of parabolic Cauchy problem are *** applications,the infinite systems of the elliptic partial differential equations and parabolic Cauchy problems are studied.

关键词： embedding theorems banach-valued function spaces differential-operator equations maximal b-regularity operator-valued Fourier multipliers interpolation of banach spaces abstract parabolic Cauchy problem

Estimation of radiative capture^(13)b(n,γ0+1)^(14)b reaction rate in the modified potential cluster model

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Chinese Physics C 2023年第10期47卷 130-142页

作者： A.S.Tkachenko N.A.burkova b.M.Yeleusheva S.b.Dubovichenko Fesenkov Astrophysical Institute 050020AlmatyKazakhstan al-Farabi Kazakh National University 050040AlmatyKazakhstan

We discuss current attempts to employ the modified potential cluster model to describe the available experimental data on the^(13)b(n,γ0+1)^(14)b total *** estimated results of the M1 and E1 transitions from the n^(13)b scattering states to the ground and first excited states of^(14)b are *** 1st resonance at Ex=1.275 MeV(1+)is revealed in both the cross-section and reaction *** the variation in the asymptotic constant,a thermal cross-section interval of 5.1-8.9 mb is *** on the theoretical total cross-sections at energies of 0.01 eV to 5 MeV,we calculate the reaction rate in the temperature range of 0.01 to *** ignition T9 values of the^(13)b(n,γ0+1)^(14)b reaction depending on a neutron number density n_(n)of~10^(22)cm^(−3)are *** radiative neutron capture reaction rates on the boron^(10-13)b and carbon^(12-14)Сisotopes are compared.

关键词： radiative neutron capture ^(14)b nucleus total cross-sections reaction rate potential cluster model r-process

Microstructural characteristics of Nd_2Fe_(14)b/α-Fe nanocomposite ribbons bearing Nb element

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Rare Metals 2008年第3期27卷 299-302页

作者： WANG Zhanyong LIU Wenqing ZHOU bangxin NI Jiansen XU Hui LI Qiang Department of Materials Engineering Shanghai Institute of Technology Shanghai 200235 China Institute of Materials Shanghai University Shanghai 200072 China

The effects of Nb on the microstructure and magnetic properties of （Nd0.9Dy0.1）9.5Fe79_xCo5Nbxb6.5 （x = 0, 1） nanocomposite magnets were investigated. A fine and uniform microstructure was achieved for the ribbons annealed at 710℃ for 4 min, enhancing the interaction coupling between grains and improving the magnetic properties. The results of three-dimensional atom probe （3DAP） indicated that Fe-Nb-b inter- granular phase existed at the grain boundaries, suppressing the grain growth during the crystallization process. The coercivity was improved from 224 to 643 kA/m for the modification of the microstructure.

关键词： Nd2Fe14b/α-Fe nanocomposite magnet 3DAP magnetic properties

The fat and the furious:fatty acids fuel hyperproliferative germinal center b cells

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Cellular & Molecular Immunology 2020年第8期17卷 794-796页

作者： Rens Peeters Annemiek b.van Spriel Department of Tumor Immunology Radboud Institute for Molecular Life SciencesRadboudumcNijmegenThe Netherlands

The germinal center(GC)reaction is considered the cornerstone of our humoral immune *** in specialized follicles inside secondary lymphoid organs,germinal center b cells(GCbCs)execute a pivotal *** an infection,the number of GCbCs is rapidly expanded,and subsequently GCbCs differentiate into specialized antibody-secreting *** intricate process is driven by the positive selection of GCbCs via the b-cell receptor with the highest affinity for the respective *** this period of extensive proliferation,GCbCs are among the fastest dividing cells in our *** has been established that cell proliferation requires tremendous amounts of energy and building ***,there remains a paucity of evidence to explain how proliferating GCbCs meet these metabolic *** their latest publication in Nature Immunology,Weisel et *** new insights that may have a far-reaching impact on the evolution of the immunometabolism field.

关键词： metabolism organs specialized