Judul: Sejarah Hidup Karang Skleraktinia di Perairan Pulau Lancang, DKI Jakarta dan Pulau Mandangin, Jawa Timur
Abstrak: Terumbu karang memiliki kemampuan untuk mempertahankan hidupnya dari stresor. Pendekatan menggunakan sejarah hidup pada karang keras dapat menduga respons yang ditunjukkan oleh karang tersebut. Respons yang diberikan oleh karang dapat berbeda setiap lokasi. Penelitian ini bertujuan untuk mengetahui perbedaan life history karang keras di Pulau Lancang dan Pulau Mandangin. Penelitian dilakukan di Pulau Mandangin, Jawa Timur pada bulan November 2020 dan Pulau Lancang, DKI Jakarta pada bulan April 2021 menggunakan metode Line Intercept Transect dengan panjang transek 20 meter dengan tiga kali ulangan sejajar garis pantai. Aktivitas antropogenik pada kedua pulau cukup tinggi sehingga komposisi komunitas bentik kedua pulau didominasi oleh abiotik. Persentase life history tertinggi di Pulau Lancang adalah stress-tolerant (33,36 ± 3,39%) dan weedy (30,54 ± 3,84%) sedangkan untuk Pulau Mandangin adalah competitive (46,59 ± 12,28%) dilanjutkan dengan weedy (31,50 ± 3,54%). Kategori life history karang keras dari kedua pulau menunjukkan bahwa tidak ada perbedaan signifikan antara karang keras di Pulau Lancang dan Pulau Mandangin karena hasil uji sampel independen menunjukkan nilai sig. 2 tailed >0.05., Coral reefs have an ability to adapt from stressors. Life history of hard coral approaching can predict the response shown by these corals. The response given by corals can vary for each location. This study aims to determine the differences of life history of hard corals on Lancang Island and Mandangin Island. This study was conducted on Mandangin Island, East Java in November 2020 and Lancang Island, DKI Jakarta in April 2021 using the Line Intercept Transect method with a transect length of 20 meters with three replications parallel to the coastline. Anthropogenic activity on the two islands is quite high as of composition of the benthic community of the two islands is dominated by abiotic. The highest percentage of life history in Lancang Island is stress-tolerant (33.36 ± 3.39%) and weedy (30.54 ± 3.84%), while Mandangin Island is competitive (46.59 ± 12.28%), continued with weedy (31.50 ± 3.54%). The hard coral life history category from the two islands shows that there is no significant difference between hard corals on Lancang Island and Mandangin Island because the results of the independent sample t-test test shows sig values. 2 tailed >0.05.
Keyword: Coral reef, Fisheries, Lancang Island, Life history, Mandangin Island

Judul: Sebaran Terumbu Karang di Perairan Pulau Menjangan Taman Nasional Bali Barat dan Biorock Pemuteran, Bali
Abstrak: Penelitian ini bertujuan mengetahui sebaran genus karang keras, bentuk pertumbuhan (lifeform) karang keras, komposisi komunitas bentik serta persentase tutupan karang keras di perairan Pulau Menjangan dan Biorock Pemuteran, Bali. Pengambilan data dilakukan pada bulan Juni 2016 menggunakan metode Point Intercept Transect (PIT) dengan panjang setiap transeknya 50 meter dan dilakukan sebanyak tiga kali pengulangan yang dibentangkan sejajar garis pantai. Komposisi komunitas bentik di kedua lokasi penelitian didominasi oleh dead coral with algae (Perairan Pulau Menjangan 51%, Biorock Pemuteran 48.9%). Diikuti oleh persentase abiotic (18%), hard coral (16%), soft coral (10%), dead coral (4.5%) dan other fauna (0.5%) di perairan Pulau Menjangan. Sedangkan di Biorock Pemuteran persentase abiotic (35%), hard coral (12%), dead coral (4%) dan other fauna (0.1%). Alveopora dan Stylophora merupakan genus karang keras yang paling dominan ditemukan di perairan Pulau Menjangan, sedangkan Acropora dan Porites dominan di Biorock Pemuteran. Coral branching dan Coral massive merupakan lifeform karang yang mendominasi kedua lokasi penelitian., This study aims to determine the distribution of hard coral genus, hard coral lifeform, benthic community composition and the percentage of hard coral cover in the waters of Menjangan Island and Biorock Pemuteran, Bali. Data collection was carried out in June 2016 using the Point Intercept Transect (PIT) method with a length of each transect of 50 meters and carried out three repetitions spread parallel to the shoreline. The composition of benthic communities in both study sites was dominated by dead coral with algae (Menjangan Island waters 51%, Biorock Pemuteran 48.9%). Followed by abiotic percentages (18%), hard coral (16%), soft coral (10%), dead coral (4.5%) and other fauna (0.5%) in the waters of Menjangan Island. Meanwhile in Biorock Pemuteran the percentage of abiotic (35%), hard coral (12%), dead coral (4%) and other fauna (0.1%). Alveopora and Stylophora are the dominant hard coral genus found in Menjangan Island waters, while Acropora and Porites are dominant in Biorock Pemuteran. Coral branching and Coral massive are coral lifeforms that dominate both study sites.
Keyword: benthic, biorock, hard coral genus, lifeform, Menjangan

Judul: Pembuatan Film Tipis Cu2ZnSnS4 sebagai Lapisan Penyerap Cahaya pada Sel Surya Menggunakan Metode Elektrodeposisi
Abstrak: Thin film of Cu2ZnSnS4 (CZTS) is an alternative semiconductor used as light absorber layer on solar cell. CZTS can replace silicon that commonly used as commercial semiconductor. The advantage of using CZTS as absorber layer is due to the abundance of its chemical composer on earth, and its high value of absorption coefficient. The absorber layer was made by using electrodeposition method on ITO glass substrates. The films were deposited at room temperature using potentiostatic mode with a potential of –1.05 V for 30, 45, and 60 minutes. After that, the films were annealed at two different temperatures, 180 ºC and 500 °C, for 45 minutes in N2/H2S atmosphere. Based on X-ray diffraction analysis, the polycrystalline thin film obtained fall into kesterite crystal phase. This type of crystal was obtained when the CZTS was annealed at 500 °C in H2S/N2 atmosphere. The value of optical band gap energy for the CZTS thin film was 2.2 eV with the film thickness about 1.228–6.366 μm. The sample of CZTS with electrodeposition time of 45 minutes and annealing temperature of 500 °C showed the best result and in conformity with absorber layers criteria for solar cells.
Keyword: semiconductor, ITO glass, CZTS thin film, electrodeposition