Autor: Tran, Dat Van - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Free vibration analysis of FGM stepped nanostructures using nonlocal dynamic stiffness model
Autorzy:: Lien, Tran Van
Duc, Ngo Trong
Dinh, Tran Binh
Dat, Pham Tuan
Powiązania:: https://bibliotekanauki.pl/articles/2086972.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: nonlocal
DSM
FGM
nanostructure
nondimensional frequency
Opis:: A nonlocal Dynamic Stiffness Model (DSM) for free vibration analysis of Functionally Graded Material (FGM) stepped nanostructures based on the Nonlocal Elastic Theory (NET) is proposed. An exact solution to the equation of motion of a nanobeam element according to the Timoshenko beam theory, NET, and taking into account position of the neutral axis is constructed. Nondimensional frequencies and mode shapes of complete FGM stepped nanostructures are easily obtained using the nonlocal DSM. Numerical results are presented to show significance of the material distribution profile, nonlocal effect, and boundary conditions on free vibration of nanostructures.
Źródło:: Journal of Theoretical and Applied Mechanics; 2022, 60, 2; 279--292
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Input Use Efficiency in Operational and Maintenance Management of Small-Pumping Scale Irrigation Systems in Red River Delta, Vietnam
Autorzy:: Dinh, Dao Van
Nguyen, Phong Tung
Tran, Dat Van
Mukheibir, Pierre
Ton, Au Nu Hai
Powiązania:: https://bibliotekanauki.pl/articles/2086427.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: technical efficiency
scale efficiency
irrigation system
DEA
data envelopment analysis
Opis:: In the Red River Delta (RRD) of Vietnam, small-pumping systems are one of main systems for paddy irrigation. It is imperative to analyze the operation and maintenance performance of irrigation systems by using the input factors when applying pricing mechanisms in the irrigation sector in Vietnam. In this study, based on the data of 48 irrigation systems managed by teams under irrigation companies, the non-parametric program, Data Envelopment Analysis, was used to measure the technical efficiency and scale efficiency for small-pumping scale irrigation systems in the Red River Delta. The seven input factors were the annual direct and indirect labor, materials, electricity, recurrent maintenance, overhead, and depreciation cost, and an output factor was the paddy areas irrigated by the systems. The results demonstrated that the average technical efficiency scores under constant returns to scale and variable returns to scale were 0.924 and 0.946, respectively. Thus, the wasted inputs were suggested to be 7.6% and 5.4% of the current input level, respectively. The average scale efficiency score was 0.977 and therefore, some 72.9% of the Decision-Making Units should adjust their input scales to achieve the efficiency in input factors.
Źródło:: Journal of Ecological Engineering; 2022, 23, 5; 207--215
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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