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On Knowledge of Binding Principles A and B by Adult Korean Learners of English
Willian Rago,유석훈,오은정 한국외국어대학교 언어연구소 2011 언어와 언어학 Vol.0 No.51
In her study on the acquisition of Principle B with adult French- and Japanese-speaking learners of English, White (1998) showed that in adult SLA Principle B is not problematic, that Principles A and B emerge together, and suggested adults have Principle P. In their study of Sensitive Period Effects Lee and Schacter (1997) suggested that their adult Korean-speaking learners of English did not make the distinction between coindexation and coreference; Principle A emerges before B. This study partially replicates Lee and Schacter (1997) with three proficiency groups of adult Korean speakers and shows that knowledge of Principles A and B are shown to emerge together.
Nonisentropic Phenomenological Model of a Reciprocating Compressor
Willian Moreira Duarte,Juan Jose Garcia Pabon,Antônio Augusto Torres Maia,LUIZ MACHADO 대한설비공학회 2019 International Journal Of Air-Conditioning and Refr Vol.27 No.4
This paper presents the development of a numerical, iterative and nonisentropic model for the thermodynamic processes of a reciprocating compressor of a refrigeration system operating at steady state. The mathematical model was implemented using the scientific software Engineering Equation Solver (EES) and it is based on the application of the energy equations in four regions of the compressor: inlet duct and chambers of pre-compression, compression, and post-compression. The model was validated with experimental data collected from an open-drive reciprocating compressor, operating with the refrigerant R-134a at different suction and discharge pressures and with different compressor rotational speeds. Model validation was made comparing the values of the mass flow rate and the discharge temperature of the compressor generated by the model with their corresponding experimental values for 33 experimental tests, the mean relative difference was − 0.2% for the discharge temperature and 2.9% for mass flow rate. In this validation, the output variables of the model were calculated considering the uncertainties from the input variables. The theoretical mean standard uncertainty is 2% for discharge temperature and 6% for mass flow rate. An analysis of the capacitive and thermal performance of the compressor was made using the model, which demonstrates a decrease in the capacitive and thermal efficiencies for increasing the pressure ratio or clearance volume.
Willian V. de Abreu,Aquilino S. Martinez,Eduardo D. do Carmo,Alessandro C. Gonçalves 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.4
This paper aims to present a new method for obtaining an analytical solution for the Kaniadakis Dopplerbroadening (KDB) function. Also, in this work, we report the computational efficiencies of this solutioncompared with the numerical one. The solution of the differential equation achieved in this paper is freeof approximations and is, consequently, a more robust methodology for obtaining an analytical representation of jk. Moreover, the results show an improvement in efficiency using the analytical approximation, indicating that it may be helpful in different applications that require the calculation of thedeformed Doppler broadening function.
Aerodynamic assessment of airfoils for use in small wind turbines
Okita, Willian M.,Ismail, Kamal A.R. Techno-Press 2019 Advances in energy research Vol.6 No.1
A successful blade design must satisfy some criterions which might be in conflict with maximizing annual energy yield for a specified wind speed distribution. These criterions include maximizing power output, more resistance to fatigue loads, reduction of tip deflection, avoid resonance and minimize weight and cost. These criterions can be satisfied by modifying the geometrical parameters of the blade. This study is dedicated to the aerodynamic assessment of a 20 kW horizontal axis wind turbine operating with two possible airfoils; that is $G{\ddot{o}}ttingen$ 413 and NACA 2415 airfoils (the Gottingen airfoil never been used in wind turbines). For this study parameters such as chord (constant, tapered and elliptic), twist angle (constant and linear) are varied and applied to the two airfoils independently in order to determine the most adequate blade configuration that produce the highest annual energy output. A home built numerical code based on the Blade Element Momentum (BEM) method with both Prandtl tip loss correction and Glauert correction, X-Foil and Weibull distribution is developed in Matlab and validated against available numerical and experimental data. The results of the assessment showed that the NACA 2415 airfoil section with elliptic chord and constant twist angle distributions produced the highest annual energy production.