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Parametric study on smoothed particle hydrodynamics for accurate determination of drag coefficient for a circular cylinder

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Water Science and Engineering 2017年第2期10卷 143-153页

作者： Maziar Gholami Korzani Sergio A. galindo-Torres Alexander Scheuermann david J. Williams School of Civil Engineering The University of Queensland St Lucia Brisbane QLD 4072 Australia School of Mathematics and Physics The University of Queensland St Lucia Brisbane QLD 4072 Australia

Simulations of two-dimensional(2D) flow past a circular cylinder with the smoothed particle hydrodynamics(SPH) method were conducted in order to accurately determine the drag coefficient. The fluid was modeled as a viscous liquid with weak compressibility. Boundary conditions,such as a no-slip solid wall, inflow and outflow, and periodic boundaries, were employed to resemble the physical problem. A sensitivity analysis, which has been rarely addressed in previous studies, was conducted on several SPH parameters. Hence, the effects of distinct parameters, such as the kernel choices and the domain dimensions, were investigated with the goal of obtaining highly accurate results. A range of Reynolds numbers(1-500) was simulated, and the results were compared with existing experimental data. It was observed that the domain dimensions and the resolution of SPH particles, in comparison to the obstacle size, affected the obtained drag coefficient significantly. Other parameters, such as the background pressure, influenced the transient condition, but did not influence the steady state at which the drag coefficient was determined.

关键词： Smoothed particle hydrodynamics Drag coefficient Reynolds number Sensitivity analysis Viscous flow

THE BLOCH SPACE ON THE UNIT BALL OF A HILBERT SPACE: MAXIMALITY AND MULTIPLIERS

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Acta Mathematica Scientia 2021年第3期41卷 899-906页

作者： Pablo galindo Mikael LINDSTRÖM Departamento de Análisis Matemático Universidad de Valencia.C/Dr.Moliner 50.46.100BurjasotValenciaSpain Department of Mathematics Abo Akademi University.FI-20500ÅboFinland

We prove that, as in the finite dimensional case, the space of Bloch functions on the unit ball of a Hilbert space contains, under very mild conditions, any semi-Banach space of analytic functions invariant under automorphisms. The multipliers for such Bloch space are characterized and some of their spectral properties are described.

关键词： Analytic functions on Hilbert space invariance under automorphisms multiplier

Proteomic analysis of F_(1)hybrids and intermediate variants in a Littorina saxatilis hybrid zone

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Current Zoology 2022年第3期68卷 351-359页

作者： Angel P.DIZ Mónica R.ROMERO Juan galindo María SAURA david O.F.SKIBINSKI Emilio ROLÁN-ALVAREZ Centro de Investigación Mariña(CIM-UVIGO) Universidade de VigoVigo 36310Spain Departamento de Mejora Genética Animal INIAMadrid 28040Spain Institute of Life Science Swansea University Medical SchoolSwansea SA28PPUK

Proteomic analysis was carried out on the Crab(upper-shore)and Wave(lower-shore)ecotypes of Littorina saxatilis from a hybrid zone at Silleiro Cape,*** profiles of individual snails were *** expression in F_(1)hybrid snails bred in the laboratory and snails with intermediate shell phenotypes collected from the mid-shore were compared with Crab and Wave ecotypes using analytical approaches used to study *** analysis over many protein spots showed that the F_(1)snails are distinct from both ecotypes but closer to the Wave *** intermediate snails are highly variable,some closer to the Crab and others to the Wave *** on a protein by protein basis,some proteins are significantly closer in expression to the Crab and others to the Wave ecotype for both F_(1)and intermediate ***,a significant majority of proteins were closer in expression to the Wave ecotype for the F_(1),consistent with the multivariate *** such significant majority toward either the Crab or Wave ecotype was observed for the intermediate *** closer similarity of F_(1)and Wave ecotype expression patterns could be the result of similar selective pressures in the similar mid-shore and low-shore *** a significantly larger number of proteins,intermediate snails were closer in expression to the ecotype having the lower expression,for both Crab and Wave *** is somewhat unexpected as lower expression might be expected to be an indication of impairment of function and lower *** analysis could be important for the identification of candidate proteins useful for gaining improved understanding of adaptation and barriers to gene flow in hybrid zones.

关键词： F_(1)hybrids gene expression marine invertebrates molecular phenotype reproductive isolation speciation

Effect of slake durability on time dependent swelling behavior of red-bed siltstone in Sichuan Basin

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Journal of Mountain Science 2024年第9期21卷 3123-3138页

作者： JIA Qinji Ruben Angel galindo AIRES LIU Xiaoming XU Haifeng Department of Geotechnical Engineering College of Civil EngineeringHunan UniversityChangsha 410082China Escuela de Caminos Canales y PuertosUniversidad Politécnica de MadridMadrid 28040Spain

The swelling behavior of red-bed rocks is a significant factor in the abnormal uplift of subgrades for high-speed railways constructed on the red stratum in the Sichuan Basin,*** prime objective of this paper is to investigate the impact of mineralogical composition,moisture content,and overburden load on the time-dependent unconfined and oedometric swelling behavior of red-bed siltstone in the context of differences in the slake *** samples were prepared for the swelling test,with eleven used for the unconfined swelling and slake index tests and nine for the oedometric swelling *** temporal dependency of swelling is characterized by the viscosity coefficient of water absorption in a proposed swelling *** indicate that the swelling deformation of red-bed rocks is due to a combination of hydration swelling within the rock matrix and crack expansion caused by air *** the unconfined swelling test,the final axial swelling strain of red-bed rocks decreases linearly with increasing slake index,while the viscosity coefficient increases exponentially with the slake *** the oedometric swelling test,red-bed rocks with lower slake durability show greater sensitivity to lateral constraint and overburden load compared to those with higher slake durability.

关键词： Rock swelling Slake durability Time effect Unconfined swelling test Oedometric swelling test

Revisiting the analytical solutions for ultimate bearing capacity of pile embedded in rocks

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第6期15卷 1506-1519页

作者： A.Picardo M.A.Millán R.galindo A.Alencar Escuela Técnica Superior de Arquitectura Universidad Politécnica de MadridMadrid28040Spain Escuela Técnica Superior de Ingenieros de Caminos Canales y Puertos de MadridUniversidad Politécnica de MadridMadrid28040Spain

This paper investigates the validity and shortcomings of the existing analytical solution for the ultimate bearing capacity of a pile embedded in a rock mass using the modified HoekeBrown failure *** this criterion is considered a reference value for empirical and numerical calculations,some limitations of its basic simplifications have not been clarified *** research compares the analytical results obtained from the novel discontinuity layout optimization(DLO)method and the numerical solutions from the finite difference method(FDM).The limitations of the analytical solution are considered by comparing different DLO failure modes,thus allowing for the first time a critical evaluation of its scope and conditioning for *** of up to 40%in the bearing capacity and unrealistic failure modes are the main issues in the analytical *** main aspects of the DLO method are also analyzed with an emphasis on the linearization of the rock failure criterion and the accuracy resulting from the discretization *** analysis demonstrates DLO as a very efficient and accurate tool to address the pile tip bearing capacity,presenting considerable advantages over other methods.

关键词： Discontinuity layout optimization(DLO) Analytical solution Bearing capacity Deep foundations HoekeBrown failure criterion Finite difference method(FDM)

A REMARK ON THE HENSELIZATION OF A REGULAR LOCAL RING

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Chinese Annals of Mathematics,Series B 1999年第1期20卷 63-64页

作者： C. galindo(Department of Mathematics(ESTCE)),UJI,Campus P.Roja,12071,Castellon ,Spain.E-mail:galindo@mail.uji.es UJI Dept Math ESTCE Castellon 12071 Spain

The author gives simple characterization of the Henselization of an excellent regular localring.

关键词： Regular local ring Local Henselian ring Characterization

Synthesis and Characterization of Hydrogels Based on Potato Starch/Poly(vinyl Alcohol)/N,N′-Methylenebisacrylamide

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Journal of Renewable Materials 2022年第8期10卷 2179-2201页

作者： Diego david Pinzón-Moreno Eder Clidio Vicuña-galindo JoséVulfrano González-Fernández JoséLuis Soto-Gonzales María Verónica Carranza-Oropeza Faculty of Chemistry and Chemical Engineering National University of San MarcosLima15081Peru

Several hydrogels were synthesized by free-radical polymerization in an aqueous medium based on potato starch(PS),poly(vinyl alcohol)(PVA),and N,N′-Methylenebisacrylamide(MBAm),being possible to study these hydrogels as a function of the proportion of components *** this way,the products generated from the synthesis were characterized by swelling and deswelling kinetics,the first swelling being verified with Schott and statistical models,allowing to contrast the proximity between the experimental and theoretical ***,water retention in soil(R%),spectroscopy(FTIR),morphological(SEM),and thermal(TGA and DSC)analysis allowing to know the intrinsic characteristics of the material,increasing in general terms the knowledge of this type of *** this context,it was possible to verify the characteristics and effectiveness of the synthesis and crosslinking of the main *** experimental results obtained show that the synthesized hydrogels present representative swellings consistent with kinetic and statistical models,optimal thermal stability depending on the amount of crosslinker,and excellent water retention in environments such as soil,presenting it as an excellent alternative to be used in agro-industrial applications in an eco-friendly way.

关键词： Hydrogel potato starch polyvinyl alcohol N,N′-Methylenebisacrylamide kinetic swelling and deswelling water retention thermal characterization morphology characterization

Impact of ZnSO_(4)^(-)and ZnO Nanoparticles on Seed Germination and Seedling Growth of Lettuce

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Phyton-International Journal of Experimental Botany 2023年第6期92卷 1831-1840页

作者： Adalberto Benavides-Mendoza Rebeca Betancourt-galindo Nazario Francisco-Francisco Departamento de Horticultura Universidad Autónoma Agraria Antonio NarroSaltillo25315México Departamento de Materiales Avanzados Centro de Investigación en Química AplicadaSaltillo25294México Departamento de Agricultura Sustentable y Protegida Universidad Tecnológica de TehuacánTehuacán75859México

Micronutrient nanoparticles(NPs)are currently an option for chemical fertilization and biostimulation in ***,there is little information on the phytotoxic or biostimulatory effects of NPs at low concentrations of some elements,such as *** this study,the effect of low concentrations of Zn oxide(ZnO)NPs on germination,growth variables,and nutritional attributes of lettuce(Lactuca sativa L.)was evaluated in comparison to Zn *** lettuce seeds were treated with ZnSO_(4)^(-)×7H_(2)O and ZnO NPs at Zn molar concentrations of 1×10^(−3),5×10^(−3),1×10^(−4),5×10^(−4),1×10^(−5),5×10^(−5),1×10^(−6),and 5×10^(−6).The seeds treated with ZnSO4−at 5×10^(−6)registered the highest radicle length,73%more than the control *** seeds treated with ZnSO4−at 5×10^(−3)registered the lowest values,with 50%less than the control *** NPs at 5×10^(−6)significantly increased content of chlorophyll A and B and total *** results indicate the possible existence of a mechanism related to the intrinsic nanoparticle properties,especially at low concentrations.

关键词： Micronutrients biostimulation nanotechnology nanofertilizers germination chlorophyll total phenols

Validity of autorefractor based screening method for irregular astigmatism compared to the corneal topography-a cross sectional study

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International Journal of Ophthalmology(English edition) 2017年第9期10卷 1412-1418页

作者： Alicia galindo-Ferreiro Julita De Miguel-Gutierrez Manuel González-Sagrado Alberto Galvez-Ruiz Rajiv Khandekar Silvana Schellini Julio galindo-Alonso King Khaled Eye Specialist Hospital Riyadh 12329SaudiArabia Department of Ophthalmology Rio-Hortega University HospitalValladolid 47012Spain Unit Research Support Rio-Hortega HospitalValladolid 47012Spain Faculdade de Medicina de Botucatu State University of SgoPauloUNESP 18618687Brazil galindo Clinic Valladolid 47003Spain

AIM：To present a method of screening for irregular astigmatism with an autorefractor and its determinants compared to corneal ***：This cross-sectional validity study was conducted in 2013 at an eye hospital in Spain.A tabletop autorefractor（test 1）was used to measure the refractive status of the anterior surface of the cornea at two corneal meridians of each *** corneal topography（test 2）and Bogan’s classification was used to group eyes into those with regular or no astigmatism（GRI）and irregular astigmatism（GRII）.Test 1 provided a single absolute value for the greatest cylinder difference（Vr）.The receiver operating characteristic（ROC）were plotted for the Vr values measured by test 1 for GRI and GRII *** the basis a Vr value of 1.25 D as cut off,sensitivity,specificity were also ***：The study sample was comprised of 260 eyes（135 patients）.The prevalence of irregular astigmatism was 42%[95%confidence interval（CI）：36,48].Based on test 2,there were 151 eyes in GRI and 109 eyes in *** median Vr was 0.75 D（25%quartile,0.5 D）for GRI and1.75 D（25%quartile,1.25 D）for *** area under curve was 0.171 for GRI and 0.83 for *** sensitivity of test I was 78.1%and the specificity was 76.1%.CONCLUSION：A conventional autorefractor can be effective as a first level screening method to detect irregular corneal astigmatism in places where corneal topography facilities are not available.

关键词： screening irregular astigmatism autorefrac-tot corneal topography cornea validity