Judul: Pengaruh Pengendalian Langkap (Arenga obtusifolia) Terhadap Komposisi Tumbuhan Pakan Badak Jawa (Rhinoceros sondaicus
Abstrak: Langkap is a plant that invades on javan rhino habitat. Thus, a proper control management of langkap needs to be carried out by using logging method. Research study in the effect of langkap control management of the plant composition is done to determine effectiveness of logging methods. Research had been conducted during in June 2013 at Kalejetan Resort, Selokan Bayun- Seuseupan Block, Ujung Kulon National Park. Data were collected using vegetation analysis in eight plots of control management to monitor the diversity of plants, and also to monitor 53 control plots to find out the correlation between javan rhino visitations and langkap control management. Based on the result of the research, cut-leave logging method is the best method to conduct. Furthermore, by eliminating seedling and sapling of langkap will also increase the diversity number of javan rhino food plants. Increasing numbers of javan rhino visitation on the sites known related to the growing levels of javan rhino food plants.
Keyword: Ujung Kulon National Park., langkap, javan rhino, control management

Judul: Studi mekanisme pertahanan langkap (Arenga obtusifolia Blumme ex Mart.) terhadap herbivory di Taman Nasional Ujung Kulon Jawa Barat
Abstrak: Taman Nasional Ujung Kulon merupakan habitat terakhir badak Jawa (Rhinoceros sondaicus Desmarest 1822) dengan populasi yang relatif kecil (± 47: 27-56 ekor, MacGriffiths, 1993). Dinamika ekologis (ekosistem) di kawasan yang menjadi habitat badak Jawa akan mempengaruhi perkembangan populasinya. Salah satu aspek penting tekanan biologis yang terjadi terhadap habitat badak Jawa adalah suksesi vegetasi khususnya adanya kecenderungan invasi langkap. (Arenga obtusifolia) dan kaitannya dengan penyediaan tumbuhan pakan badak (Muntasib, et al., 1992). Berdasarkan kondisi tersebut, sangat penting dilakukan penelitian yang bertujuan untuk mengidentifikasi karakteristik ekologi langkap, khususnya yang berhubungan dengan kapabilitas invasi dan pengaruhnya terhadap dinamika habitat badak Jawa (Haryanto, 1992). Tujuan penelitian ini adalah mengidentifikasi mekanisme perta- hanan buah langkap terhadap herbivory, yang terdiri atas identifikasi jenis satwa liar pelaku herbivory; identifikasi kelas umur buah yang dikonsumsi dan identifikasi mekanisme interaksi, serta menganalisis kandungan natrium oksalat dalam pendugaan mekanisme pertahanan lang- kap terhadap herbivory; menganalisis golongan senyawa metabolit se- kunder dan analisis proksimat. Pengamatan lapangan dilakukan di Resort Cibunar pada bulan Januari 1995 yaitu dengan pengamatan langsung dan pengamatan tak langsung. Analisis kandungan senyawaan kimia dilakukan pada bulan Juli 1995 meliputi analisis kandungan natrium oksalat dengan metode titrasi oksidi-reduktometri dan uji umum golongan senyawaan metabolit sekunder (alkaloid, flavonoid dan terpenoid) dilakukan di Lab Kimia Analitik Jurusan Kimia P-MIPA IPB; sedangkan analisis proksimat dilakukan di Lab Biokimia dan Lab Kimia Analisis Terpadu IPB. ...
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Judul: Elektrodeposisi Film Tipis Semikonduktor Cu2ZnSnS4 (CZTS) pada Substrat Kaca ITO
Abstrak: Semiconductor Cu2ZnSnS4 (CZTS) thin film that can be used as absorber layers on solar cell module was made via electrodeposition method. CZTS thin film was electrodeposited on the surface of a silicate glass coated with a thin layer of indium tin oxide (ITO). Deposition process was done using potentiostatic mode at room temperature with a potential of 1.05 V for 30, 45, and 60 minutes, followed with annealing the film at 2 different temperatures, 500 ºC using furnace and 180 ºC using hot plate, both treatments for 45 minutes in N2/H2S atmosphere. The X-ray difractograms were analyzed using Match 2 program and showed that the CZTS thin films had kesterit crystalline structure, with a low percentage of CZTS phase. The thin film also contained secondary phases such as Cu2S, ZnS, and SnS. The obtained CZTS thin films had a thickness between 1.039 and 1.676 μm. Absorption study showed that the band gap energy of CZTS thin films which was annealed using furnace ranged from 1.50 to 1.52 eV, whereas that annealed using the hot plate was not observed. The band gap energy value showed that CZTS thin films can be used as sunlight absorber layers on solar cell. The formation of CZTS crystal film on this investigation was effectively performed using furnace annealing process at a temperature of 500 ºC with deposition time of 45 minutes.
Keyword: Thin film, Electrodeposition, Cu2ZnSnS4