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Upwind and High-Resolution methods for Compressible Flow:From Donor Cell to Residual-Distribution Schemes

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Communications in Computational Physics 2006年第2期1卷 192-206页

作者： Bram van Leer w.m.keck Foundation laboratory for Computational Fluid Dynamics Department of Aerospace EngineeringThe University of MichiganAnn ArborMI 48108-2140USA

In this paper I review three key topics in CFD that have kept researchers busy for half a ***,the concept of upwind differencing,evident for 1-D linear ***,its implementation for nonlinear systems in the form of highresolution schemes,now regarded as ***,its genuinely multidimensional implementation in the form of residual-distribution schemes,the most recent *** lecture focuses on historical developments;it is not intended as a technical review of methods,hence the lack of formulas and absence of figures.

关键词： Upwind difference high-resolution method compressible flow nonlinear conservation laws

Upconversion hollow nanospheres CeF_(3) co-doped with Yb^(3+) and Tm^(3+) for photocatalytic nitrogen fixation

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Journal of Rare Earths 2022年第4期40卷 586-594,I0003页

作者： minghui Zhong Zhendong wang Da Dai Baozhu Yang Shixiang Zuo Chao Yao Fengqin wu Xiazhang Li Advanced Catalysis and Green manufacturing Collaborative Innovation Center Jiangsu Key Laboratory of Advanced Catalytic Materials and TechnologyChangzhou UniversityChangzhou 213164China w.m.keck Center for Advanced microscopy and microanalysis University of DelawareNewarkDE19716USA

Solar driven nitrogen(N_(2))fixation to synthesize ammonia is a potential alternative for the traditional Haber-Bosch approach to meeting industrial demand,but is largely hampered by the difficulties in the harvesting of solar energy and activating inert N_(2).In this work,hollow CeF_(3) nanospheres co-doped with activator Tm^(3+)and sensitizer Yb^(3+)(Yb^(3+):Tm^(3+):CeF_(3))were prepared by microwave hydrothermal *** product was employed as a catalyst for photo-driven N_(2) fixation by adjusting the molar ratio of Ce^(3+):Yb^(3+):Tm^(3+).Results show that the porous hollow structure enhances the light-harvesting by physical scattering and *** addition,heteroatom doping generates abundant fluorine vacancies(F_(V))which provide abundant active sites for adsorption and activation of N_(2).The sample with molar ratio of CeF_(3):Yb^(3+):Tm^(3+)at 178:20:2 demonstrates the highest utilization of solar energy attributed to the strongest upconversion capability of near-infrared(NIR)light to visible and ultraviolet(UV)light,and the NH_(4)+concentration achieves the highest value of 15.06μmol/(gcat∙h)under simulated sunlight while nearly 6.22μmol/(gcat∙h)under NIR *** study offers a promising and sustainable strategy for the fixation of atmospheric N_(2) using full-spectrum solar energy.

关键词： Rare earth CeF_(3) Hollow structure Upconversion Fluorine vacancy Photocatalytic nitrogen fixation

microstructures and Hardness Properties for β-Phase Ti-24Nb-4Zr-7.9Sn Alloy Fabricated by Electron Beam melting

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Journal of materials Science & Technology 2013年第11期29卷 1011-1017页

作者： J.Hernandez S.J.Li E.martinez L.E.murr X.m.Pan K.N.Amato X.Y.Cheng F.Yang C.A.Terrazas S.m.Gaytan Y.L.Hao R.Yang F.medina R.B.wicker Department of metallurgical and materials Engineering The University of Texas at El Paso Shenyang National laboratory for materials Science Institute of Metal ResearchChinese Academy of Sciences School of materials Science and Engineering Dalian University of Technology w.m.keck Center for 3D Innovation The University of Texas at E1 Paso

Atomized, pre-alloyed Ti-24Nb-4Zr-7.9Sn （wt%） powder was used to fabricate solid, prototype components by electron beam melting （EBm）. Vickers microindentation hardness values were observed to average 2 GPa for the precursor powder and 2.5 GPa for the solid, EBm-fabricated products. The powder and solid product microstructures were examined by optical and electron microscopy. X-ray diffraction analyses showed that they had bcc β-phase microstructure. However, it was found by transmission electron microscopy that the EBm-fabricated product had plate morphology with space -100-200 nm. Although the corresponding selected area diffraction patterns can be indexed by β-phase plus α＂-martensite with orthorhombic crystal structure, the dark-field analyses failed to observe the α＂-martensite. Such phenomenon was also found in deformed gum metals and explained by stress-induced diffusion scattering due to phonon softening.

关键词： Biomedical titanium alloy β-martensite Electron beam melting Hardness Optical and electron microscopy

Ke Hsin Kuo:A distinguished scientist and great mentor

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Protein & Cell 2019年第2期10卷 79-86页

作者： Da-Neng wang Lu-Chang Qin Skirball Institute of Biomolecular medicine and Department of Cell BiologyNew York University School of Medicine540 First AvenueNew YorkNY 10016USA w.m.keck laboratory for Atomic Imaging and manipulation Department of Physics and AstronomyUniversity of North CarolinaChapel HillNC 27599USA

Early years Professor Ke Hsin Kuo was bom in Beijing in 1923,and his childhood was spent in Harbin in northemstem China where his father worked as an engineer to build the local *** early education was at best characterized by frequent disruptions,the first of which being the"9.18 Incidenf of 1931 when the Japanese Kwantung Army launched an assault in Shenyang(mukden)on the local Chinese troops and quickly took control of all the Northeastern Provinces(manchuria).He moved to Tianjin in the spring of 1936,where he continued his education by enrolling in the famous Nankai High ***,his school life at Nankai was soon disrupted again by the eruption of full-scale war in July of 1937 after Japan attacked and occupied *** with his brothers,he fled to join his parents who had previously relocated to *** studied in Chongqing for four more years to complete his high school education,during which classes were constantly being disrupted due to the frequent bombings of the city by Japanese *** bombings not only left him with long lasting memories of the war,but also bore him a permanent burn scar on his back as a result of a bomb that exploded just meters away from him.

关键词： Professor childhood manchuria

High-throughput metagenomic analysis of petroleum-contaminated soil microbiome reveals the versatility in xenobiotic aromatics metabolism

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Journal of Environmental Sciences 2017年第6期29卷 25-35页

作者： Yun-Juan Bao Zixiang Xu Yang Li Zhi Yao Jibin Sun Hui Song National Engineering laboratory for Industrial Enzymes Chinese Academy of SciencesTianjin 300308China Key laboratory of Systems microbial Biotechnology Chinese Academy of SciencesTianjin 300308China Tianjin Institute of Industrial Biotechnology Chinese Academy of SciencesTianjin 300308China Key laboratory of Immune microenuironment and Disease of the ministry of Education Tianjin Medical UniversityTianjin 300070China w.m.keck Center for Transgene Research University of Notre DameNotre DameIN 46556USA

The soil with petroleum contamination is one of the most studied soil ecosystems due to its rich microorganisms for hydrocarbon degradation and broad applications in bioremediation. However, our understanding of the genomic properties and functional traits of the soil microbiome is limited. In this study, we used high-throughput metagenomic sequencing to comprehensively study the microbial community from petroleum-contaminated soils near Tianjin Dagang oilfield in eastern China. The analysis reveals that the soil metagenome is characterized by high level of community diversity and metabolic versatility. The metageome community is predominated by 7-Proteobacteria and a-Proteobacteria, which are key players for petroleum hydrocarbon degradation. The functional study demonstrates over-represented enzyme groups and pathways involved in degradation of a broad set of xenobiotic aromatic compounds, including toluene, xylene, chlorobenzoate, aminobenzoate, DDT, methylnaph- thalene, and bisphenol. A composite metabolic network is proposed for the identified pathways, thus consolidating our identification of the pathways. The overall data demon- strated the great potential of the studied soil microbiome in the xenobiotic aromatics degradation. The results not only establish a rich reservoir for novel enzyme discovery but also provide putative applications in bioremediation.

关键词： Comparative genomicsmetagenomic sequencingTaxonomic analysisOil-contaminated soils

Bilinear Forms for the Recovery-Based Discontinuous Galerkin method for Diffusion

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Communications in Computational Physics 2009年第2期5卷 683-693页

作者： marc van Raalte Bram van Leer Centrum voor wiskunde en Informatica P.O.Box 940791090 GB AmsterdamThe Netherlands w.m.keck Foundation laboratory for Computational Fluid Dynamics Department of Aerospace EngineeringThe University of MichiganAnn ArborMI 48109-2140USA

The present paper introduces bilinear forms that are equivalent to the recovery-based discontinuous Galerkin formulation introduced by Van Leer in *** recovery method approximates the solution of the diffusion equation in a discontinuous function space,while inter-element coupling is achieved by a local L_(2)projection that recovers a smooth continuous function underlying the discontinuous *** we introduce the concept of a local“recovery polynomial basis”–smooth polynomials that are in the weak sense indistinguishable from the discontinuous basis polynomials–and show it allows us to eliminate the recovery *** recovery method reproduces the symmetric discontinuous Galerkin formulation with additional penalty-like terms depending on the targeted accuracy of the *** present the unique link between the recovery method and discontinuous Galerkin bilinear forms.

关键词： Diffusion equation discontinuous Galerkin methods recovery basis L_(2)projection

Additively manufactured Ti–Ta–Cu alloys for the next-generation load-bearing implants

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International Journal of Extreme manufacturing 2024年第1期6卷 353-374页

作者： Amit Bandyopadhyay Indranath mitra Sushant Ciliveri Jose D Avila william Dernell Stuart B Goodman Susmita Bose w.m.keck Biomedical materials Research laboratory School of Mechanical and Materials EngineeringWashington State UniversityPullmanWA 99164United States of America Veterinary Clinical Sciences College of Veterinary MedicineWashington State UniversityPullmanWA 99164United States of America Department of Orthopedic Surgery Stanford University Medical CenterRedwood CityCA 94063United States of America

Bacterial colonization of orthopedic implants is one of the leading causes of failure and clinical complexities for load-bearing metallic implants. Topical or systemic administration of antibiotics may not offer the most efficient defense against colonization, especially in the case of secondary infection, leading to surgical removal of implants and in some cases even limbs. In this study, laser powder bed fusion was implemented to fabricate Ti3Al2V alloy by a 1:1 weight mixture of CpTi and Ti6Al4V powders. Ti-Tantalum(Ta)–Copper(Cu) alloys were further analyzed by the addition of Ta and Cu into the Ti3Al2V custom alloy. The biological,mechanical, and tribo-biocorrosion properties of Ti3Al2V alloy were evaluated. A 10 wt.% Ta(10Ta) and 3 wt.% Cu(3Cu) were added to the Ti3Al2V alloy to enhance biocompatibility and impart inherent bacterial resistance. Additively manufactured implants were investigated for resistance against Pseudomonas aeruginosa and Staphylococcus aureus strains of bacteria for up to 48 h. A 3 wt.% Cu addition to Ti3Al2V displayed improved antibacterial efficacy, i.e.78%–86% with respect to CpTi. mechanical properties for Ti3Al2V–10Ta–3Cu alloy were evaluated, demonstrating excellent fatigue resistance, exceptional shear strength, and improved tribological and tribo-biocorrosion characteristics when compared to Ti6Al4V. In vivo studies using a rat distal femur model revealed improved early-stage osseointegration for alloys with10 wt.% Ta addition compared to CpTi and Ti6Al4V. The 3 wt.% Cu-added compositions displayed biocompatibility and no adverse infammatory response in vivo. Our results establish the Ti3Al2V–10Ta–3Cu alloy’s synergistic effect on improving both in vivo biocompatibility and microbial resistance for the next generation of load-bearing metallic implants.

关键词： Ti6Al4V load-bearing implants additive manufacturing 3D printing antibacterial performance

YPED: An integrated Bioinformatics Suite and Database for mass Spectrometry-based Proteomics Research

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Genomics, Proteomics & Bioinformatics 2015年第1期13卷 25-35页

作者： Christopher m.Colangelo mark Shifman Kei-Hoi Cheung Kathryn L.Stone Nicholas J.Carriero Erol E.Gulcicek TuKiet T.Lam Terence wu Robert D.Bjornson Can Bruce Angus C.Nairn Jesse Rinehart Perry L.miller Kenneth R.williams w.m.keck Foundation Biotechnology Resource laboratory School of Medicine Yale University Department of molecular Biophysics & Biochemistry Yale University Yale Center for medical Informatics School of Medicine Yale University Department of Anesthesiology School of Medicine Yale University Department of Emergency medicine School of Medicine Yale University VA Connecticut Healthcare System w.m. keck Foundation Biotechnology Resource laboratory School of Medicine Yale University Department of Computer Science Yale University Yale Center for Genome Analysis West Campus Yale University Yale west Campus Analytical Core West Campus Yale University Yale Bioinformatics Resource School of Medicine Yale University Department of Psychiatry School of Medicine Yale University Department of Cellular & molecular Physiology School of Medicine Yale University Systems Biology Institute Yale University

we report a significantly-enhanced bioinformatics suite and database for proteomics research called Yale Protein Expression Database（YPED） that is used by investigators at more than 300 institutions worldwide. YPED meets the data management, archival, and analysis needs of a high-throughput mass spectrometry-based proteomics research ranging from a singlelaboratory, group of laboratories within and beyond an institution, to the entire proteomics community. The current version is a significant improvement over the first version in that it contains new modules for liquid chromatography–tandem mass spectrometry（LC–mS/mS） database search results, label and label-free quantitative proteomic analysis, and several scoring outputs for phosphopeptide site localization. In addition, we have added both peptide and protein comparative analysis tools to enable pairwise analysis of distinct peptides/proteins in each sample and of overlapping peptides/proteins between all samples in multiple datasets. we have also implemented a targeted proteomics module for automated multiple reaction monitoring（mRm）/selective reaction monitoring（SRm） assay development. we have linked YPED＇s database search results and both label-based and label-free fold-change analysis to the Skyline Panorama repository for online spectra visualization. In addition, we have built enhanced functionality to curate peptide identifications into an mS/mS peptide spectral library for all of our protein database search identification results.

关键词： Proteomics Database Bioinformatics mass spectrometry Repository Spectral library

Near-UV light assisted green reduction of graphene oxide films through l-ascorbic acid

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International Journal of Smart and Nano materials 2021年第1期12卷 20-35页

作者： Jaime Regis Sebastian Vargas Andrea Irigoyen Elsa Bramasco-Rivera Jose L.Bañuelos Luis C.Delfin Anabel Renteria Ulises martinez Tommy RockwardYirong Lin Department of mechanical Engineering The University of Texas at El PasoEl PasoTX USA w.m.keck Center for 3D Innovation the University of Texas at El PasoEl PasoTX USA Department of Physics The University of Texas at El PasoEl PasoTX USA materials Physics and Applications Los Alamos National LaboratoryLos AlamosNM USA Department of mechanical Engineering The University of Texas At El Paso 500 w.University Ave.El Paso TX 79968United States

Recent studies have highlighted the effects of various stimuli on the chemical reduction of graphene oxide(GO)through green reductant L-ascorbic acid(L-AA);however,the combination of near ultraviolet(NUV)light to increase the reduction rate has yet to be thoroughly *** this study,drop-casted GO films were subjected to chemical reduction through L-AA with various levels of exposure under 405 nm NUV *** structure and uniformity of GO stackings that form the film were characterized through scanning electron microscopy(SEm)and wide-angle x-ray scattering(wAXS).Additionally,wAXS was used to track the removal of oxygen-containing functional groups along with Fourier-transform infrared(FT-IR)spectroscopy and x-ray photoelectron spectroscopy(XPS)as a function of L-AA and NUV light exposure *** results demonstrated that the interaction between L-AA and NUV exposure has a significant effect on the reduction of ***,the results that yielded the highest reduction(C-C bond concentration of 60.7%)were the longest L-AA and NUV light exposure times(48 hours and 3 hours,respectively).This report provides a study on the effects of NUV on the green reduction of GO films through L-AA with potential application in solar energy and chemical sensing applications.

关键词： Graphene Oxide Films Green Reduction Near Ultraviolet Light L-Ascorbic Acid wide-Angle X-Ray Scattering