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Effect of deep cryogenic treatment on the microstructural,mechanical and ballistic properties of AA7075-T6 aluminum alloy

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Defence Technology（防务技术） 2023年第12期30卷 101-110页

作者： S.Dharani kumar U.magarajan Saurabh S Kumar rodríguez-millan m Centre for machining and material Testing KPR Institute of Engineering and TechnologyCoimbatoreIndia Department of mechanical Engineering Sri Venkateswara College of EngineeringChennaiIndia Scientific Officer Ballistic Research Centre&Testing RangeNational Forensic Sciences UniversityGandhi NagarIndia Department of mechanical Engineering University Carlos Ⅲ of MadridLeganesMadridSpain

The study focused on investigating the effect of Deep Cryogenic Treatment(DCT)on the mechanical and ballistic properties of AA7075-T6 aluminum *** microstructure,microhardness,tensile strength,and impact strength of the Base material(Bm)and DCT-treated 7075 samples were analyzed through metallographic analysis and mechanical *** microstructure of the DCT-treated 7075 samples revealed fine grains and a distribution of secondary phase *** tensile strength,impact strength,and microhardness of DCT-treated samples increased by 7.41%,4%,and 9.68%,respectively,compared to the Bm *** fractography analysis of the tensile samples showed cleavage facets,microvoids,and dimples in both the *** ballistic behavior of the Bm and DCT target plates were studied by impacting hard steel core projectiles at a velocity of 750±10 m/*** target plates failed due to petaling and ductile hole enlargement,and the depth of penetration(DOP)of the DCT target was less than that of the Bm target,indicating a higher ballistic *** post-ballistic microstructure examination of the target plates showed the formation of an Adiabatic Shear Band(ASB)without any *** was concluded that the DCT treatment improved the mechanical and ballistic properties of the aluminum alloy due to grain refinement and high dislocation density.

关键词： Deep cryogenic treatment AA7075-T6 mechanical properties Ballistic Adiabatic shear band

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Gromov Hyperbolicity of Riemann Surfaces

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Acta mathematica Sinica,English Series 2007年第2期23卷 209-228页

作者： José m.rodríguez EVa TOURIS Departamento de matemáticas Universidad Carlos Ⅲ de MadridAvenida de la Universidad 3028911 LeganésMadridSpain

We study the hyperbolicity in the Gromov sense of Riemann surfaces. We deduce the hyperbolicity of a surface from the hyperbolicity of its ＂building block components＂. We also prove the equivalence between the hyperbolicity of a Riemann surface and the hyperbolicity of some graph associated with it. These results clarify how the decomposition of a Riemann surface into Y-pieces and funnels affects the hyperbolicity of the surface. The results simplify the topology of the surface and allow us to obtain global results from local information.

关键词： Gromov hyperbolicity hyperbolic Riemann surface

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Plateau archives of lithosphere dynamics,cryosphere and paleoclimate:The formation of Cretaceous desert basins in east Asia

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Geoscience Frontiers 2022年第6期13卷 170-181页

作者： Chihua Wu Juan Pedro rodríguez-López m.Santosh State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengdu 610059China PAGODA Research Group(Plateau&Global Desert Basins Research Group) Institute of Sedimentary GeologyChengdu University of TechnologyChengdu 610059China Permafrost Laboratory Department of GeographyUniversity of SussexFalmerBrighton BN19SJUnited Kingdom School of Earth Science and Resources China University of Geosciences29 Xueyuan RoadBeijing 100083China Department of Earth Sciences University of AdelaideSA 5005Australia

Southeastern Eurasia is a global window to the Cretaceous paleoclimate and lithosphere *** contains one of the most complete and complex sedimentary records of mesozoic desert basins on planet *** this study,we perform the spatio-temporal tracking of 96 Cretaceous palaeoclimate indicators during 79 myr which reveal that the plateau paleoclimate archives from East Asia resulted from an Early to mid-Cretaceous ocean–atmosphere coupling and a shift to a preponderant role of Late Cretaceous lithosphere dynamics and tectonic forcing on high-altitude depositional systems linked to the subduction margins of the Tethys and Paleo-Pacific realms beneath the Eurasian *** crustal response to tectonic processes linked with the spatio-temporal evolution of the Tethyan and Paleo-Pacific margins defined the configuration of major sedimentary basins on this *** significant increase and decrease in the number of active sedimentary basins that occur during the Cretaceous,from 16 in the Early Cretaceous,to 28 in the mid-Cretaceous,and a decreasing to 20 sedimentary basins in the Late Cretaceous,is a direct response of lithospheric dynamics associated with the two main subduction zones(Tethys and Pacific domains).A shift in subduction style from an Early Cretaceous Paleo-Pacific Plate slab roll back to a Late Cretaceous flat-slab mode might have triggered regional plateau uplift,blocked intraplate volcanism,thus enhancing the denudation and sediment availability,and created wind corridors that led to the construction and accumulation of extensive Late Cretaceous aeolian sandy deserts(ergs)that covered mid-Cretaceous plateau *** the same time,plateau uplift associated with crustal thickening following terrane assembly in the Tethyan margin triggered altitudinal cryospheric processes in sandy desert *** of an active Cretaceous cryosphere in China include ValanginianHauterivian glacial debris flows,Early Aptian geochemical signature of melt w

关键词： Cretaceous Cryosphere Aeolian Plateau Subduction Asia

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Improved deterministic and stochastic models for simulating partial discharges in non‐conducting trees inside solid dielectrics

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High Voltage 2021年第1期6卷 82-94页

作者： Johnatan m.rodríguez‐Serna Ricardo Albarracín‐Sánchez Department of Electrical and Electronic Engineering Automatic Controland Applied PhysicsSchool of Industrial Design and Engineering(ETSIDI)Universidad Politécnica de Madrid(UPM)MadridSpain Department of Electrical Engineering Universidad de AntioquiaMedellínColombia

Electrical trees are defects originated and driven by partial discharges(PD)activity and this is the reason why their modelling and simulation are fundamental for the ageing mechanisms comprehension and diagnosis analyses of insulation systems compound by solid *** study presents a brief review of the different models implemented to simulate PD in electrical trees inside solid *** addition,an improved deterministic model as well as a stochastic model are presented,which allow predicting adequately the PD pulses distribution,in magnitudes and phase,for non‐conducting electrical trees of different shape and *** case studies were simulated and their results exhibit good agreement when compared with measurements presented in the *** is concluded that the main parameters that state the PD behaviour in trees are the inception and extinction voltage mag-nitudes,including their probability distributions,and the tree *** models can be used for prognosis analysis based on on‐line measurements.

关键词： solid conducting electrical

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Ecosystem Services of Grazed Grasslands in the Flooding Pampa

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Phyton-International Journal of Experimental Botany 2024年第6期93卷 1179-1202页

作者： Elizabeth J.Jacobo Adriana m.rodríguez Facultad de Agronomía Área de AgroecologíaUniversidad de Buenos AiresBuenos Aires1417Argentina Facultad de Agronomía Departamento de Producción AnimalUniversidad de Buenos AiresBuenos Aires1417Argentina

The Flooding Pampa grasslands are the last remnant of the Rio de la Plata grasslands in ***-genic interventions have led to severe degradation and,as a result,the ecosystem services provided by the grass-lands are declining,in terms of provisioning,regulating,and supporting *** synthesized the existing literature on the ecosystem goods and services provided by these grasslands under grazing in different conditions and conservation *** found that plant and animal diversity and primary production are the most studied ecosystem services,while climate regulation,water supply,nutrient cycling,meat production and erosion control,in that order,are less *** services are *** grazing and glyphosate spraying are the main drivers of grassland *** grazing and conservative stocking rates have been shown to reverse degradation and demonstrate that livestock production is compatible with ecosystem conserva-tion by maintaining regulating and provisioning *** these management strategies are poorly integrated,improving their implementation will require important changes in farmers’decisions and the development of policies that create the economic conditions for this to *** is needed to understand the conditions that prevent the knowledge generated from being transferred to producers and translated into practices that would improve the provision of ecosystem services.

关键词： Salado basin sustainability biodiversity rangelands meat production adaptative multi paddock grazing process technologies agroecology

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magnetic filtration of an iron oxide aerosol by means of magnetizable grates

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China Particuology 2007年第1期5卷 140-144页

作者： A. Alvaro J.m. rodríguez Paulo A. Augusto A.m. Estvez Department of Chemical Engineering University of Salamanca Plaza de los Caídos 1-5 37008 Salamanca Spain Department of Chemical Engineering University of Salamanca Plaza de los Caídos 1-5 37008 Salamanca Spain Department of Chemical Engineering Faculty of Engineering University of Porto Rua Dr. Roberto Frias 4200-465 Porto Portugal

The cleaning of gases with low concentrations of small ferromagnetic or paramagnetic particles is a difficult task for conventional filtration. A new alternative procedure, magnetic filtration, is used in this work. Iron oxide aerosol was generated by elutriation of iron oxide particles from a fluidized bed consisting of a mixture of Geldart-C iron oxide powder and large spherical Geldart-B sand particles. The aerosol was filtered by means of a magnetic filter which consisted of one, two or three iron grates staggered to each other. The experimental installation contained also an isokinetic sampling system and a microtrac SRA 150 Particle Analyser. A theoretical expression for filtration efficiency was deduced from a previous model taking into account the different forces acting on the iron oxide particles. Experimental filtration efficiency matches quite well calculated theoretical efficiency. It was found that an increase in particle size, in thee number of grates or in the applied magnetic field produced higher filtration efficiencies up to 100% in some cases. In all filtration experiments pressure drop through the magnetic filter was very small.

关键词： Iron oxide aerosol magnetic filtration Iron grates

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Large-Scale Group Decision making:A Systematic Review and a Critical Analysis

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IEEE/CAA Journal of Automatica Sinica 2022年第6期9卷 949-966页

作者： Diego García-Zamora Alvaro Labella Weiping Ding Rosa m.rodríguez Luis martínez Department of Computer Science University of JaénJaén 23071Spain IEEE School of Information Science and Technology Nantong UniversityNantong 226019China

The society in the digital transformation era demands new decision schemes such as e-democracy or based on social *** novel decision schemes require the participation of many experts/decision makers/stakeholders in the decision *** a result,large-scale group decision making(LSGDm)has attracted the attention of many researchers in the last decade and many studies have been conducted in order to face the challenges associated with the ***,this paper aims at reviewing the most relevant studies about LSGDm,identifying the most profitable research trends and analyzing them from a critical point of *** do so,the Web of Science database has been consulted by using different *** these results a total of 241 contributions were found and a selection process regarding language,type of contribution and actual relation with the studied topic was then carried *** 87 contributions finally selected for this review have been analyzed from four points of view that have been highly remarked in the topic,such as the preference structure in which decision-makers’opinions are modeled,the group decision rules used to define the decision making process,the techniques applied to verify the quality of these models and their applications to real world problems ***,a critical analysis of the main limitations of the existing proposals is ***,taking into account these limitations,new research lines for LSGDm are proposed and the main challenges are stressed out.

关键词： Challenges large-scale consensus models large-scale group decision making(LSGDm) systematic review

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mETA-R:A software to analyze data from multi-environment plant breeding trials

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The Crop Journal 2020年第5期8卷 745-756页

作者： Gregorio Alvarado Francisco m.rodríguez Angela Pacheco Juan Burgueño JoséCrossa mateo Vargas Paulino Pérez-rodríguez marco A.Lopez-Cruz Biometrics and Statistics Unit International Maize and Wheat Improvement Center(CIMMYT)MexicoDF 6-64106600Mexico Centro de Investigación en matemáticas(CImAT)A.C. Jalisco S/NCol.ValencianaGuanajuatoGto 40236023Mexico Universidad Autónoma Chapingo Carretera Federal México-Texcoco km 38.5TexcocoMéxico 6356230Mexico Colegio de Postgraduados Carretera México-Texcoco Km.36.5MontecilloTexcoco 6356231Mexico Department of Plant Soil and Microbial SciencesMichigan State University1066 Bogue StEast LansingMI 48824USA

mETA-R(multi-environment trial analysis in R)is a suite of R scripts linked by a graphical user interface(GUI)designed in Java *** objective of mETA-R is to accurately analyze multi-environment plant breeding trials(mETs)by fitting mixed and fixed linear models from experimental designs such as the randomized complete block design(RCBD)and the alpha-lattice/lattice ***-R simultaneously estimates the best linear and unbiased estimators(BLUEs)and the best linear and unbiased predictors(BLUPs).Additionally,it computes the variance-covariance parameters,as well as some statistical and genetic parameters such as the least significant difference(LSD)at 5%significance,the coefficient of variation in percentage(CV),the genetic variance,and the broad-sense *** parameters are very important in the selection of top performing genotypes in plant ***-R also computes the phenotypic and genetic correlations among environments and between traits,as well as their statistical *** genetic correlations between environments or traits can be visualized in a biplot graph or a tree diagram(dendrogram).Genetic correlations are very important for identifying environments with similar behavior or making indirect selection and identifying the most highly associated ***-R performs multi-environment analyses by using the residual maximum likelihood(REmL)method;these analyses can be done by environment,across environments by grouping factors(stress conditions,nitrogen content,etc.)and across environments;the analyses across environments can be done with a pre-defined degree of heritability.

关键词： environments breeding variance

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Electron states and electron Raman scattering in semiconductor double cylindrical quantum well wire

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Chinese Physics B 2016年第11期25卷 453-460页

作者： m munguía-rodríguez Ri Betancourt-Riera Re Betancourt-Riera R Riera J m Nieto Jalil Departamento de Investigación en Física Universidad de Sonora Apartado Postal 5-88 83190 Hermosillo Sonora México Instituto Tecnológico de Hermosillo. Avenida Tecnologico S/N Col. Sahuaro 83170 Hermosillo Sonora México Tecnológico de monterrey-Campus Sonora Norte. Bulevar Enrique mazón Lopez No. 965 83000 Hermosillo Sonora México

The differential cross section for an electron Raman scattering process in a semiconductor GaAs/AlGaAs double quantum well wire is calculated,and expressions for the electronic states are *** system is modeled by considering T = 0 K and also with a single parabolic conduction band,which is split into a subband system due to the *** gain and differential cross-section for an electron Raman scattering process are *** addition,the emission spectra for several scattering configurations are discussed,and interpretations of the singularities found in the spectra are *** electron Raman scattering studied here can be used to provide direct information about the efficiency of the lasers.

关键词： Electron cylindrical confinement conduction radius decoupling AlGaAs parabolic modeled resonant

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Cementite Characterization with Chromium and Vanadium Contents Using Indentation Technique

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Journal of Iron and Steel Research International 2015年第4期22卷 366-370页

作者： John Jairo CORONADO Sara Aida rodrguez Research Group of Fatigue and Surfaces School of Mechanical EngineeringUniversity of Valle

Cast irons with some kinds of cementite with different chromium and vanadium contents were character- ized. Fracture toughness was determined by using an indentation technique, along with microhardness and elastic modulus. The results show that at the load of 1 N, microhardness of the cementite with 5.1% Cr is 10.53 GPa, the microhardness for cementite with 9.2% Cr increased to 11.25 GPa and for cementite with 4.5% V the microhard- ness is 9.18 GPa. The cementite with 9.2% Cr presented the highest elastic modulus of 230.4 GPa and the cement- ire with 4% V presented the lowest value of 201.32 GPa. Cementite with 5.1% Cr presented higher fracture tough- ness than cementite with 9.2% Cr; however, cementite with 4.5% V presented the highest fracture toughness of 2.74 mPa ·m1/2 and the lowest brittleness index of 3.35 μm-1/2.

关键词： cementite microhardness elastic modulus fracture toughness indentation technique

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