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Aries Astradhani Subgan
Jurusan Fisika FMIPA UNIPA
Agriculture, Biological Sciences & Forestry Chemistry Mathematics Physics

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ANALISIS SENSITIVITAS BEBERAPA WILAYAH DI PAPUA BARAT TERHADAP FENOMENA ENSO Aries Astradhani Subgan
Jurnal Natural Vol. 13 No. 1 (2014)
Publisher : FMIPA Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/jn.v13i1.21

Abstract

Inter-annual climate variability (ENSO) become major issues for sciences for nowadays because the effect of globally. The purpose of this research is to know the characteristic of the climate on West Papua Region that can investigate and to know variable of the responds to every area of the ENSO phenomena. This is use for the climate parameter for rainfall and sea surface temperature (SST). Technic analysis begins to see periodicities rainfall using wavelet transformation. Next, analysis percentage of rainfall on the phases of ENSO Cases to see how big the influence of ENSO to the Increasing and Decreasing of rainfall in every region. Next step is to use statistic technical to see the connection between rain drop variable into the Standardized Precipitation Index (SPI) to the ENSO index. The result of wavelet analysis to the rainfall showed the domination of periodicities in one year, this indicated that the research area is effected by monsoon and local factors. The result of rain fall percentage and linier correlation analysis of ENSO index to the SPI in each territorial in general showed the ENSO influence. This can be shown by negative correlation score that means, when there is an EL NINO (La Nina) in Pacific Ocean at the same time there is a decreasing or increasing of rainfall in research territorial. The variation in each location responds showed the ENSO effect doesn’t have to influence directly to the rain fall in the research zone.
KAJIAN TEORITIS RANCANGAN BILAH KINCIR ANGIN HORIZONTAL MODIFIKASI NACA 4412, 4415, 23012, DAN 23015 SEBAGAI PENGHASIL ENERGI ALTERNATIF DI MANOKWARI Rosalina Rosina Mirino; I Gede Deny Arsemaya Partadinova; Aries Astradhani Subgan
Jurnal Natural Vol. 18 No. 2 (2022): Jurnal Natural
Publisher : FMIPA Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/jn.v18i2.200

Abstract

This research aims to produce a windmill blade design simulation using Airfoil NACA series 4412, 4415, 23012, 23015 and to determine the best type of windmill blade design based on the amount of power generated by the wind speed. The blade design was made using the Qblade v0.91b program based on the NACA 4412, 4415, 23012, and 23015 airfoils with taper and taperless types. Blade design begins with determining blade geometry and continues with blade design performance testing. Wind speed in Manokwari is classified based on the limit of the effective wind occurring in a day, which is 9 hours. The results showed that NACA 4412 and NACA 4415 were better than NACA 23012 and NACA 23015 with the efficiency of each blade reaching 49%. The NACA 4412 series taper produces an average total power per month of 168.38 KW and taperless of 196.93 KW from the average number of occurrences of potential wind speed of 9.35 m/s of 26 days. The NACA 4415 taper blade produces 164.8 KW of power while the taperless blade is 192.73 KW for the same average number of wind potentials. Based on the amount of power generated, the taperless type in the 4412 series is the best blade for wind speed in Manokwari.
Co-Authors I Gede Deny Arsemaya Partadinova Rosalina Rosina Mirino