Judul: Kondisi Habitat dan Sebaran Rafflesia rochussenii di RPH Legokherang KPH Kuningan Jawa Barat
Abstrak: Rafflesia rochussenii merupakan spesies yang langka dan dilindungi pemerintah. Spesies tersebut ditemukan di Kuningan Jawa Barat yang merupakan distribusi baru di luar kawasan konservasi. Penelitian ini bertujuan mengidentifikasi kondisi habitat R. rochussenii dan sebarannya di RPH Legokherang, KPH Kuningan, Jawa Barat. Penelitian dilakukan pada bulan Februari-Maret 2020. Metode yang digunakan adalah purposive sampling dengan petak tunggal seluas 0.1 ha. Selain itu, studi literatur sebagai data penunjang. Hasil penelitian ditemukan sebanyak 29 individu R. rochussenii, kelas diameter kuncup yang paling besar yaitu 6.1-7cm. Spesies inang yang digunakan adalah Tetrastigma leucostaphylum dan spesies yang mendominasi adalah Oreocnide rubescens. Ditemukan sebanyak 6 spesies fauna dari 5 ordo yang beraktivitas di sekitar habitat R. rochussenii. Habitat R. rochussenii berada pada tipe hutan dataran rendah dengan ketinggian 536-594 m dpl dan kemiringan 77-87%, jenis tanah laterit merah dengan pH 5 dan suhu ratarata sebesar 26.5°C. Sebaran R. rochussenii di RPH Legokherang ditemukan sebanyak 3 titik. Belum adanya upaya yang dilakukan pengelola kawasan terhadap perlindungan kelestarian R. rochussenii dan habitatnya.
Keyword: Kata kunci: habitat, Rafflesia rochussenii, sebaran, Tetrastigma leucostaphylum.

Judul: Habitat Characteristics of Rafflesia rochussenii Teijsm. et Binn. in Cimande Resort, Gunung Gede Pangrango National Park
Abstrak: Rafflesia rochussenii is a rare and protected plant species. This species is found in Cimande Resort, Gunung Gede Pangrango National Park, Bogor, West Java. The purpose of this study is to describe the habitat characteristics of Rafflesia rochussenii in Cimande Resort, both biotic and abiotic components, and to explain its management program. The method used is purposive sampling with circular plots with a radius of 17.8 m. Literature study was done to find supporting data. Results identified 57 Rafflesia individuals were found consisting of alive and dead flowers as well as alive and dead buds. The host was Tetrastigma leucostaphylum. The dominating species at the tree, sapling, seedling and undergrowth level were Schima wallihcii, Castanopsis acuminatissima, Aspnlenium nidus, and Cinchona pubescens, respectively. Six species of animals were identified. Rafflesia habitat is found in the altitude of 840-1,360 masl, a slope of 10% -88%, average temperature of 19°C and relative humidity ranging from 80-90%. Soil pH ranges from 5-6.5, soil color is reddish brown to yellow. Leaf Area Index value ranges from 1.85-2.11. Management done by the National Park is inventory and monitoring.
Keyword: abiotic, biotic, habitat, Rafflesia rochussenii

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