Judul: Inventarisasi dan kajian potensi invasif Arthropoda dan tumbuhan yang masuk ke wilayah Indonesia melalui Bandara Soekarno-Hatta dan Pelabuhan Tanjung Priok:
Abstrak: Peningkatan mobilitas manusia dan barang menimbulkan peningkatan kemungkinan lalu lintas organisme di seluruh dunia. Organisme yang dilalulintaskan tersehut antara lain ternak, binatang piaraan, bibit, dan produkproduk pertanian serta kehutanan yang banyak dimasukkan ke suatu negara dari negara lain untuk berbagai tujuan. Pemasukan tersebut merupakan pemasukan yang disengaja. Selain pemasukan secara sengaja, organisme juga dapat masuk ke suatu negara secara tidak sengaja, misalnya dengan mengkontaminasi komoditas yang dimasukkan secara sengaja. Organisme yang masuk secara sengaja maupun tidak sengaja perlu diwaspadai karena kemungkinan dapat menimbulkan permasalahan di kemudian hari. Permasalahan yang dapat timbul di kemudian hari salah satunya disebabkan oleh kemampuan organisme tersebut untuk bertahan dan berkembang biak serta pada akhirnya mengancam keanekaragaman hayati. Permasalahan ini dapat ditimbulkan oleh spesies asing invasif atau dikenal dengan Invasive Alien Species (IAS).
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Judul: Keanekaragaman Spesies Tumbuhan Asing Invasif di Resort Ranu Pani Taman Nasional Bromo Tengger Semeru
Abstrak: Invasive Alien Species (IAS) is species of flora or fauna, including the microorganisms that live out of the native habitat. The IAS are growing rapidly cause it doesn’t has natural enemy, therefore it becoming weeds, pests, and diseases on native species. This study conducted on forest and savanna in Ranu Pani Resort. Vegetation analysis in the forest was using combination of strip and line quadrat method. Five species of IAS that belong into 3 families are identified based on analysis result. Vegetation analysis in savanna was using quadrat method, and the result is 2 species of IAS was identified which is also found in the forest. Seven invasive species identified in this study and the result from Morishita index showed that 5 species has a clumped distribution patterns, there are Acacia decurrens, Ageratina riparia, Austroeupatorium inulifolium, Imperata cylindrica, and Tithonia diversifolia. Furthermore, the exploration result is 2 species of IAS has found, there are Ricinus communis and Lantana camara.
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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