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Indentation Size Effect and Microhardness Study of β-Sn Single Crystals

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Chinese Physics Letters 2005年第12期22卷 3137-3140页

作者： o. SAHIN o. uZuN u. kolEMEN b. DuZGuN N. uCAR Department of Physics Art and Science Faculty Suleyman Demirel University Isparta Turkey Department of Physics Art and Science Faculty Gaziosmanpasa University Tokat Turkey Department of Physics K. K. Education Faculty Ataturk-University Erzurum Turkey

The load dependence of apparent microhardness of β-Sn single crystals having different growth directions is investigated. The measurements are performed on （110） planes of these crystals in the load range from 10 to 50 mN. It is found that the degree of the microhardness anisotropy decreases for higher indentation test loads. The examined materials exhibit the behaviour of indentation size effect （ISE）, i.e., the apparent hardness increases with decreasing indentation load. Neither Meyer＇s law nor the proportional specimen resistance （PSR） model can fully explain the nonlinear variation of microhardness with load. Instead, preference is given to modified the PSR model based on the consideration of the effect of machining-induced residually stressed surface on the hardness measurement.

关键词： Microhardness

Synthesis and Some Properties of Metal organic Chemical Vapour Deposited Molybdenum oxysulphide Thin Films

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Journal of Materials Science & Technology 2010年第6期26卷 552-557页

作者： b.olofinjana G.o.Egharevba M.A.Eleruja C.Jeynes A.V.Adedeji o.o.Akinwunmi b.A.Taleatu C.u.Mordi E.o.b.Ajayi Department of Physics Obafemi Awolowo UniversityIle-IfeNigeria Department of Chemistry Obafemi Awolowo UniversityIle-IfeNigeria Department of Electronic and Electrical Engineering University of SurreyGuildfordSurrey GU2 5XHUK Department of Chemistry and Physics Elizabeth City State UniversityElizabeth CityNC 27909USA

Molybdenum oxodithiocarbamate was prepared as thin films which were deposited on sodalime glass a single solid source precursor for molybdenum oxysulphide substrates using metal organic chemical vapour deposition （MoCVD） technique at a temperature of 420~C. Rutherford backscattering spectroscopy （RbS） was used to determine the elemental composition of the film which showed that the films contained large amounts of oxygen. The large amount of oxygen was attributed to the large abundance of oxygen in the starting material. A direct optical energy gap of 3.31 eV was obtained from the analysis of the absorption spectrum. The scanning electron microscopy （SEM） micrographs of the films showed that the films were continuous and porous. An estimated average size of the grains was below 5 #m. X-ray diffraction （XRD） showed that the deposited films were crystalline in nature.

关键词： Molybdenum oxodithiocarbamate Molybdenum oxysulphide Metal organic chemical vapour deposition (MoCVD) Thin film

Metal organic Chemical Vapour Deposited Thin Films of Cobalt oxide Prepared via Cobalt Acetylacetonate

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Journal of Materials Science & Technology 2009年第1期25卷 85-89页

作者： C.u. Mordi M.A. Eleruja b.A. Taleatu G.o. Egharevba A.V. Adedeji o.o. Akinwunmi b. olofinjana C. Jeynes E.o.b. Ajayi Department of Physics Obafemi Awolowo University Ile-Ife Nigeria Department of Chemistry Obafemi Awolowo University Ile-Ife Nigeria Department of Physics Auburn University Alabama United States Department of Electronics and Electrical Engineering University of Surrey Guildford Surrey GU2 7XH UK

The single solid source precursor, cobalt （Ⅱ） acetylacetonate was prepared and characterized by infrared spectroscopy. Thin films of cobalt oxide were deposited on soda lime glass substrates through the pyrolysis （metal organic chemical vapour deposition （MoCVD）） of single solid source precursor, cobalt acetylacetonate, Co[C5H7o2]2 at a temperature of 420℃. The compositional characterization carried out by rutherford backscattering spectroscopy and X-ray diffraction （XRD）, showed that the films have a stoichiometry of Co2o3 and an average thickness of 227±0.2 nm. A direct energy gap of 2,15±0.01 eV was calculated by the data obtained by optical absorption spectroscopy. The morphology of the films obtained by scanning electron microscopy, showed that the grains were continuous and uniformly distributed at various magnifications, while the average grain size was less than i micron for the deposited thin films of cobalt oxide.

关键词： Precursor Thin film oxide Metal organic chemical vapour deposition (MoCVD) Rutherford backscattering spectroscopy (RbS)

Delamination Testing of AlSi10Mg Sandwich Structures with Pyramidal Lattice Truss Core made by Laser Powder bed Fusion

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Chinese Journal of Mechanical Engineering 2021年第6期34卷 51-62页

作者： M.Nuño J.bühring M.N.Rao K.-u.Schröder Institute of Structural Mechanics and Lightweight Design RWTH Aachen UniversityWüllnerstraβe 752072 AachenGermany

Sandwich structures possess a high bending stiffness compared to monolithic structures with a similar *** makes them very suitable for lightweight applications,where high stiffness to weight ratios are *** common manufacturing methods of sandwich structures involve adhesive bonding of the core material with the ***,adhesive bonding is prone to delamination,a failure mode that is often difficult to *** paper presents the results of delamination testing of fully additive manufactured(AM)AlSi10Mg sandwich structures with pyramidal lattice truss core using Laser Powder bed Fusion(LPbF).The faces and struts are 0.5 mm thick,while the core is 2 mm *** inclination of the struts is 45°.To characterise the bonding strength,climbing drum peel tests and out-of-plane tensile tests are *** formulas are derived to predict the expected failure loads and *** analytics and tests are supported by finite element(FE)*** the analytic approach,design guidelines to avoid delamination in AM sandwich structures are *** study presents a critical face sheet thickness to strut diameter ratio for which the structure can *** ratio is mainly influenced by the inclination of the *** peel tests resulted in face yielding,which can also be inferred from the analytics and *** out-of-plane tensile tests didn’t damage the structure.

关键词： Additive Manufacturing Sandwich Structures Pyramidal Lattice Core

Potential Effect of Conservation Tillage on Sustainable Land use: A Review of Global Long-Term Studies

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Pedosphere 2006年第5期16卷 587-595页

作者： WANG Xiao-bin CAI Dian-Xiong W.b.HooGMoED o.oENEMA u.D.PERDoK State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing 210008 （China） Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences Beijing 100081 （China） Farm Technology Group Wageningen University P. O. Box 17 6700 AA Wageningen （The Netherlands） Soil Quality Group Wageningen University P.O.Box 8005 6700 EC Wageningen （The Netherlands）

Although understood differently in different parts of the world, conservation tillage usually includes leaving crop residues on the soil surface to reduce tillage. Through a global review of long-term conservation tillage research, this paper discusses the long-term effect of conservation tillage on sustainable land use, nutrient availability and crop yield response. Research has shown several potential benefits associated with conservation tillage, such as potential carbon sequestration, nutrient availability, and yield response. This research would provide a better perspective of the role of soil conservation tillage and hold promise in promoting application of practical technologies for dryland farming systems in China.

关键词： conservation tillage no-till reduced tillage residue management

Effects of slag fineness on durability of mortars

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Journal of Zhejiang university-Science A(Applied Physics & Engineering) 2007年第11期8卷 1725-1730页

作者： ToPu lker bekir bLR Turhan Department of Civil Engineering Eski■ehir osmangazi university Eski■ehir 26480 Turkey

In recent years, the usages of by-products and wastes in industry have become more important. The importance of the sustainable development is also of increasing. The utilizations of wastes, as mineral admixture or fine aggregate, reduce the consumption of the natural resources and improve the durability of concrete. In this study, the effect of the fineness on the high temperature and sulphate resistances of concrete mortar specimens, produced with ground granulated blast-furnace slag (GbFS) replacing cement, is investigated. The compressive and flexural strength test results for all series related to durability effects, exposing temperature and solutions, exposure times for these durability effects, slag content and fineness are discussed. Conse- quently, the optimum slag contents are determined for producing the sulphate and high temperature resistant mortars.

关键词： Cement Fineness Ground slag High temperature effect Sulphate attack Sustainable development

Scenario Analysis of Tillage, Residue and Fertilization Management Effects on Soil organic Carbon Dynamics

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Pedosphere 2005年第4期15卷 473-483页

作者： WANG Xiao-bin CAI Dian-Xiong W. b. HooGMoED o. oENEMA u. D. PERDoK Soil and Fertilizer Institute Chinese Academy of Agricultural Sciences Beijing 100081 （China） Soil Technology Group Wageningen University P. O. Box 17 6700 AA Wageningen （The Netherlands） Soil Quality Group Wageningen University P. O. Box 8005 6700 EC Wageningen （The Netherlands）

based on data from 10-year field experiments on residue/fertilizer management in the dryland farming region of northern China, Century model was used to simulate the site-specific ecosystem dynamics through adjustment of the model＇s parameters, and the applicability of the model to propose soil organic carbon （SoC） management temporally and spatially, in cases such as of tillage/residue/fertilization management options, was identified v/a scenario *** between simulations and actual measurements were in close agreement when appropriate applications of stover,manure and inorganic fertilizer were combined. Simulations of extreme C/N ratios with added organic materials tended to underestimate the measured effects. Scenarios of changed tillage methods, residue practices and fertilization options showed potential to maintain and enhance SoC in the long run, while increasing inorganic N slowed down the SoC turnover rate but did not create a net C sink without any organic C input. The Century model simulation showed a good relationship between annual C inputs to the soil and the rate of C sequestration in the top 20 cm layer and provided quantitative estimations of changes in parameters crucial for sustainable land use and management. Conservation tillage practices for sustainable land use should be integrated with residue management and appreciable organic and inorganic fertilizer application, adapted according to the local residue resource, soil fertility and production conditions. At least 50% residue return into the soil was needed annually for maintenance of SoC balance, and manure amendment was important for enhancement of SoC in small crop-livestock systems in which crop residue land application was limited.

关键词： Century model conservation tillage crop residue dryland soil organic carbon

Resonant production of color octet muons at Future Circular Collider-based muon-proton colliders

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Chinese Physics C 2018年第8期42卷 99-107页

作者： Y.C.Acar u.Kaya b.b.oner Department of Material Science and Nanotechnology TOBB University of Economics and Technology Department of Physics Ankara University

We investigate the resonant production of color octet muons in order to explore the discovery potential of Future Circular Collider（FCC）-based μp *** is shown that the search potentials of μp colliders essentially... 详细信息

关键词： leptogluons lepton-hadron interactions composite models muon-proton colliders color octet muon,beyond the standard model

Study of nucleon-nucleon and alphanucleon elastic scattering by the Manning-Rosen potential

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Communications in Theoretical Physics 2020年第7期72卷 60-64页

作者： A K behera J bhoi u Laha b Khirali Department of Physics National Institute of TechnologyJamshedpur831014India Department of Physics Veer Surendra Sai University of TechnologyBurla-768018OdishaIndia

Although often used in molecular dynamics,in this work the Manning-Rosen potential is parameterized to compute the scattering phase shifts for the nucleon-nucleon and the alphanucleon systems by exploiting the standard phase function *** obtain excellent agreement in phase shifts with the more sophisticated calculations up to partial waves l=2.

关键词： phase function method Manning-Rosen potential scattering phase shifts nucleon-nucleon and the alpha-nucleon systems