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Quantitative Tests for Income Level Convergence in Asian Countries
Tejero, Wilma Milo,Hwang, Jinyoung KNU The Institute of ManagementEconomy Research 2019 Asia-Pacific Journal of Business Vol.10 No.1
Asian countries have been striving for economic integration for decades. This effort may lead to the convergence of income level through externalities across countries. This paper investigates whether the convergence phenomenon holds for income levels in Asian countries for the periods between 1975-2015 applying the traditional methodology of ${\sigma}-$ and ${\beta}-convergence$. Although the absolute ${\beta}-convergence$ of income levels in Asian and ASEAN+3 countries do hold, ${\sigma}-convergence$ and conditional ${\beta}-convergence$ of income level generally do not exist. This suggests that the benefits of economic integration in Asian countries were not yet realized to be significant. A plausible explanation is that the economies of Asian countries are largely based on low trade openness and a high level of informal economy.
Montserrat Iborra,Javier Tejero,Carles Fite,Eliana Ramirez,Fidel Cunill 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-
The liquid-phase synthesis of butyl levulinate by esterification of levulinic with an excess of 1-butanol(initial molar ratio 1:3) and simultaneous water removal has been studied at atmospheric pressure and atthe boiling point of the reacting medium. The catalytic performance of ten commercial sulfonic resins hasbeen compared: four gel-type and six macroreticular. For both type of resins the levulinic acid conversionwas complete after 4–6 h and no byproducts derived from the acid were detected. Selectivity of 1-butanoltowards the ester was about 95%, di-butyl ether and butenes being the detected 1-butanol-derivedbyproducts. Among the tested catalysts, gel-type resins with low crosslinking degree showed the highestactivity, what could be attributed to a higher accessibility to active centers in polar medium. In additionalexperiments where initial reactants content was at stoichiometric relation, the levulinic acid conversionwas lower (82–85%), while selectivity of 1-butanol towards the ester was slightly higher, because of thelower 1-butanol concentration.
Papavasiliou, Theodora,Park, Paul Dain,Tejero, Ricardo,Allain, Niklaas,Uppal, Lauren Korean Society of Plastic and Reconstructive Surge 2021 Archives of Plastic Surgery Vol.48 No.4
Adequate positioning of the hand is a critical step in hand fracture operative repair that can impact both the clinical outcome and the efficiency of the operation. In this paper, we introduce the use of a thermoplastic splint with an added thumb stabilizing component as a means to increase the surgeon's autonomy and to streamline the patient care pathway. The thermoplastic splint is custom fabricated preoperatively by the specialist hand therapist. The splint is used prior, during, and post operation with minimal modification. The thumb component assists maintaining the forearm in a stable pronated position whilst drilling and affixing metal work. This is demonstrated in the video of removal of metal work and open reduction and internal fixation of a metacarpal fracture.
Assembly strategies of wind turbine towers for minimum fatigue damage
Nunez-Casado, Cristina,Lopez-Garcia, Oscar,de las Heras, Enrique Gomez,Cuerva-Tejero, Alvaro,Gallego-Castillo, Cristobal Techno-Press 2017 Wind and Structures, An International Journal (WAS Vol.25 No.6
The aim of this paper is to present a method to obtain the dynamic response of a wind turbine tower in time domain by means of the generation of time series and to estimate the associated fatigue damage by means of a Rainflow counting algorithm. The proposed method is based on assuming the vortex shedding is a bidimensional phenomena and on following a classical modal superposition method to obtain the structure dynamic response. Four different wind turbine tower geometric configurations have been analyzed in a range of usual wind velocities and covering extreme wind velocities. The obtained results have shown that, depending on the turbulence intensity and the mean wind velocity, there are tower geometric configurations more advantageous from the fatigue load standpoint. Consequently, the presented model can be utilized to define assembly strategies oriented to fatigue damage minimization.
Assembly strategies of wind turbine towers for minimum fatigue damage
Cristina Nunez-Casado,Oscar Lopez-Garcia,Enrique Gomez de las Heras,Alvaro Cuerva-Tejero,Cristobal Gallego-Castillo 한국풍공학회 2017 Wind and Structures, An International Journal (WAS Vol.25 No.6
The aim of this paper is to present a method to obtain the dynamic response of a wind turbine tower in time domain by means of the generation of time series and to estimate the associated fatigue damage by means of a Rainflow counting algorithm. The proposed method is based on assuming the vortex shedding is a bidimensional phenomena and on following a classical modal superposition method to obtain the structure dynamic response. Four different wind turbine tower geometric configurations have been analyzed in a range of usual wind velocities and covering extreme wind velocities. The obtained results have shown that, depending on the turbulence intensity and the mean wind velocity, there are tower geometric configurations more advantageous from the fatigue load standpoint. Consequently, the presented model can be utilized to define assembly strategies oriented to fatigue damage minimization.