نتایج جستجو برای: jmak model
تعداد نتایج: 2104312 فیلتر نتایج به سال:
abstract the present study was conducted to investigate the effect of using model essays on the development of writing proficiency of iranian pre-intermediate efl learners. to fulfill the purpose of the study, 55 pre- intermediate learners of parsa language institute were chosen by means of administering proficiency test. based on the results of the pretest, two matched groups, one as the expe...
Abstract This paper presents a numerical model of the laser welding steel, taking into account heat and mass flows, as well thermal effects associated with phase transformations. It was assumed that source is symmetrical power distribution TEM 10 beam in two condition variants: stationary moving at constant speed along sample. After reaching melting temperature, movement liquid forced by Marang...
In metastable ?-Ti alloys, nanoscale isothermal ?-phase (?iso) precipitates are regarded as the nucleation sites for ? strengthening phase. Here we investigate precipitation kinetics of ?iso a function cooling rate (air and water quenching) after ?-solutionising. A combined in situ small-angle neutron scattering (SANS) electrical resistivity measurement approach was used during ageing Ti–5Al–5M...
Crystallization in an undercooled Aluminum (Al) droplet occurs via the formation of crystalline nuclei by homogeneous or heterogeneous nucleation and successive growth nuclei. Clusters a new phase appear system due to fluctuations after reaching critical size grow up microscopic size. event at low undercooling 6.4°C 9.91 mg compact Al sample was detected using isothermal differential scanning c...
abstract this paper discusses several commonly used models for strategic marketing¹ including market environmental analysis methods (i.e. swot and pest analysis) and strategic marketing tools and techniques (i.e. boston matrix and shell directional policy matrix)and shows how these models may help a firm to achieve its strategic goals. at first, the main reason for doing this research is de...
Nucleation and growth of ice in the fibrous gas-diffusion layer (GDL) of a proton-exchange membrane fuel cell (PEMFC) are investigated using isothermal differential scanning calorimetry (DSC). Isothermal crystallization rates and pseudo-steady-state nucleation rates are obtained as a function of subcooling from heat-flow and induction-time measurements. Kinetics of ice nucleation and growth are...
• Solidification experiments of Al-Cu alloys are observed in situ and real-time. Large-scale 2D PF simulations solidification realized. Effects cooling rate liquid flow on multi-grain growth discussed. The equiaxed dendritic nearly isothermal temperature field under continuous condition is studied using real-time observation by synchrotron X-ray radiography large-scale quantitative two-dimensio...
Wire and Arc Additive Manufacturing (WAAM) emerged as a manufacturing process for large scale structures with extensive form design freedom. WAAM can be fully exploited once the relation between transient thermal history its to microstructure development resultant mechanical properties is established. This further used computational tools such Topology Optimization. paper presents model predict...
rivers and runoff have always been of interest to human beings. in order to make use of the proper water resources, human societies, industrial and agricultural centers, etc. have usually been established near rivers. as the time goes on, these societies developed, and therefore water resources were extracted more and more. consequently, conditions of water quality of the rivers experienced rap...
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