Article Per Year (5 Year)
p-Index From 2021 - 2026
0.23
P-Index
This Author published in this journals
All Journal Jurnal Ilmiah Agroust Journal of Applied Science and Advanced Engineering
Septiawan, Dedy
Unknown Affiliation
Agriculture, Biological Sciences & Forestry Computer Science & IT Electrical & Electronics Engineering Engineering Mechanical Engineering Physics

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
PEMBERIAN PUPUK ORGANIK DAN SUMBER NITROGEN HUMAT TERHADAP PERTUMBUHAN DAN HASIL TANAMAN LIDAH BUAYA (Aloe vera L.) di LAHAN PASIR Septiawan, Dedy; Darini, Maria Theresia; Darnawi, Darnawi
JURNAL ILMIAH AGROUST Vol 3 No 1 (2019): Maret
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study aims to determine the effect of rate of cow manure and the right source of humic nitrogen on the growth and yield of aloe vera plants in sand fields. The study was conducted in Cangkringan Hamlet, Poncosari, Srandakan, Bantul, D.I. Yogyakarta. The study was conducted from November 2017 - March 2018. The study was arranged in a Complete Randomized Block Design (RAKL), factorial 2 replications. The first factor is the dose of cow manure, consisting of two levels, namely 30 tons per ha and 45 tons per ha. The second factor, the type of nitrogen fertilizer supplemented with humic acid, consisted of urea + humic acid, ZA + humic acid, NPK + humic acid, KNO3 + humic acid. Analysis with variance at 5% real level, followed by Duncan Multiple Range Test (DMRT) and level of 5%. Observations were observed, namely leaf length, leaf width, leaf thickness, leaf fresh weight, leaf dry weight, and number of leaves. The results of this study show that there is no significant difference and the interaction between cow manure and humic nitrogen sources on all variables observed in the growth of aloe vera plants in sandy soil
Aerodynamic Performance of the NACA 0012 Airfoil: Lift and Drag Characteristic Across a Range of Angles of Attack Septiawan, Dedy; Yuliaji, Dwi; Waluyo, Roy
Journal of Applied Science and Advanced Engineering Vol. 4 No. 1 (2026): JASAE: March 2026
Publisher : Master Program in Mechanical Engineering, Gunadarma University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59097/jasae.v4i1.79

Abstract

The wing is one of the most critical components in an aircraft structure, as it directly contributes to the generation of lift, which enables flight. Without wings, an aircraft would be unable to produce lift or counter aerodynamic drag effectively. This study aims to analyze the lift and drag forces acting on a NACA 0012 airfoil under varying angles of attack and flow velocities. Two approaches were employed: numerical simulations using ANSYS Fluent to investigate airflow patterns and pressure distribution on the upper and lower surfaces of the airfoil, and experimental testing in a wind tunnel to validate and complement the findings. The experiments considered angles of attack of 0°, 3°, 6°, and 9°, with freestream velocities of 1 m/s and 3 m/s. The quantitative data collected include lift coefficient (CL), drag coefficient (CD), the relationships between CL–α, CD–α, and CL–CD, as well as pressure and velocity distributions from the CFD simulations. Both computational and experimental results indicate that increasing the angle of attack produces a significant change in the lift and drag characteristics of the airfoil. In conclusion, variations in the angle of attack have a substantial impact on the aerodynamic flow behavior around the airfoil and on the magnitude of the resulting lift and drag forces.
Co-Authors Darnawi Darnawi Dwi Yuliaji Maria Theresia Darini Roy Waluyo