Judul: Studi Efisiensi dan Kinerja dari Sel Surya Multijunction Al0.3Ga0.7As/Inp/Ge terhadap Variasi Suhu
Abstrak: Penggabungan beberapa bahan semikonduktor sel surya untuk memperoleh nilai efisiensi yang tinggi dikenal dengan sel surya multijunction. Salah satu faktor yang dapat memengaruhi kinerja dan efisiensi dari sel surya adalah suhu sel surya itu sendiri. Penelitian ini menggunakan program PC1D sebagai simulator sel surya dan program Matlab untuk melakukan perhitungan intensitas. Bahan semikoduktor yang digunakan adalah Al0.3Ga0.7As, InP dan Ge. Sel surya multijunction Al0.3Ga0.7As/InP/Ge dengan variasi suhu 25, 50, 75 dan 100 ºC menghasilkan tegangan open circuit yang menurun pada setiap lapisan sebanding dengan kenaikan suhu sel surya. Tegangan open circuit pada lapisan pertama Al0.3Ga0.7As menurun sebesar -8.7 mV/ ºC, lapisan kedua InP mengalami penurunan sebesar -1.4 mV/ ºC dan lapisan ketiga Ge mengalami penurunan sebesar -1.3 mV/ ºC. Koefisien suhu dari efisiensi total sel surya multijunction Al0.3Ga0.7As/InP/Ge adalah sebesar -0.34 %/ ºC. Peningkatan suhu sel surya menyebabkan penurunan terhadap kinerja dan efisiensi sel surya multijunction Al0.3Ga0.7As/InP/Ge.
Keyword: efisiensi, sel surya multijunction, spektrum AM1.5G, suhu

Judul: Simulasi Kinerja Sel Surya 4-Junction Al0.3Ga0.7As/GaAs/InP/Ge dengan Pembatasan Daerah Serapan Radiasi Matahari.
Abstrak: Solar cells development increased rapidly indicated by the increasing solar cells efficiency. One way to increase the efficiency is by using multi-junction solar cells. In this research, 4-junction solar cells Al0.3Ga0.7As/GaAs/InP/Ge has been designed and simulated using PC1Dv5.9 program in two different models. In Model 1, different current is produced in each sublayer, while in Model 2 the identical current restricted in each sublayer. Every models are simulated in two different conditions, i.e without absorption area restriction (wavelength fron 280 to 2500 nm) and with restriction of solar radiation (restricted cutoff wavelength). Model 1 showed that solar cells without spectrum restriction (efficiency 64.23%) are more efficient than the one with restriction (efficiency 36.48%). Model 2 showed smaller efficiency compared to Model 1, with 12.75 % efficiency for solar cells without spectrum restriction and 2.81% for the one with restriction. All simulations were performed using AM1.5G radiation spectrum.
Keyword: solar cells, PC1D program, multi-junction, efficiency

Judul: Pola Distribusi Penyu Lekang (Lepidochelys olivacea) Berdasarkan Struktur Genetik di Teluk Cendrawasih, Pulau Kapoposang, dan Kupang.Pola Distribusi Penyu Lekang (Lepidochelys olivacea) Berdasarkan Struktur Genetik di Teluk Cendrawasih, Pulau Kapoposang, dan Kupang.
Abstrak: The olive ridley sea turtle (Lepidochelys olivacea) is one species of sea turtles that can be found in Indonesia. The distribution pattern of olive ridley turtle (Lepidochelys olivacea) based on the genetic structure is poorly known. Therefore, this study aimed to determine the distribution pattern of olive ridley sea turtle (Lepidochelys olivacea) based on the genetic structure Mitochondrial. DNA Cytochrome Oxidase 1 (CO1) was used as marker. The distribution pattern indicated that the absence of inter-population genetic structure of olive ridley turtle (Lepidochelys olivacea) between three populations of Cendrawasih Bay, Kapoposang Island, and Kupang (FST=-0.023;P-value=0.462). High genetic diversity was observed in three populations (h=1.00+/-0.04). High gene flow seems influenced by the behavior of turtle migration. The olive ridley turtle migration patterns moving within the Indonesian waters.
Keyword: Lepidochelys olivacea, DNA Barcoding, genetic structure, migration