Judul: Developing Information System for Climate Based Potential Area of Brown Plant Hopper (Nilaparvata lugens) in North Coast of West Java
Abstrak: Pest infestation is still a big limiting factor for crop production in Indonesia. Although a number of efforts have been made to solve this problem, serious damages caused by pest attacks are still reported from some crop production areas. Among those several pest and diseases, Brown Plant Hopper/BPH (Nilaparvata lugens) is the one that caused severe damage in rice farming. It was recorded on 1998 in West Java that there was 84,976 hectares of rice has been damaged due to BPH and decreased the national rice production as much as 1 percent. There are some reasons for the increase of crop pest and disease attack i.e.: (1) rice planting season is not at the same schedule, (2) climate anomaly like La-Nina, where on some occasions rainfall occur during dry season. To reduce the worst impact of pest on crop production and productivity, it is needed to have an anticipated efforts and adaptation to climate change. The anticipation strategy and technology deals with adaptation to climate change and the pest attack are aspects that have to be considered in the strategic planning. To support the development of this strategic planning, information system for potential area attack of Brown Plant Hopper (Nilaparvata lugens) is needed. The objectives of this study are as follows : (1). to study climate parameters that stimulate the BPH attack, (2). to define the relationship between climate parameters and area of BPH attacked, and (3) to build information system of potential area of BPH attack on the paddy field areas. A set of historical climate and area of BPH attack are needed to know the climate parameters are influenced area of BPH attack and to predict future area of BPH attack base on climate prediction. The information system of potential area of BPH attack deals with database, models, and interface that work together over one stand alone application. The potential area of BPH attack can be displayed with spatial distribution. In the implementation phase, this information system needs future climate data prediction as an input to the model. As a result for prediction potential of area of BPH attack of January 2008, there was area that by prediction was attacked, and it was present in the field. In contrast, there was by prediction was attacked but it was absent in the field. Thus, there are other factors such as rice varieties and planting time that have to be considered in the further model development.
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Judul: Analysis of Climatic Factors on Brown  Planthopper Attack in Northern Subang
Abstrak: Subang merupakan salah satu sentra produksi padi di Jawa Barat setelah Indramayu dan Karawang. Fluktuasi produksi padi tidak terlepas dari faktor iklim serta serangan hama dan penyakit. Wereng batang coklat (Nilaparvata lugens Stal.) merupakan salah satu hama berbahaya pada tanaman padi karena dapat menularkan virus lain. Pemodelan Climex digunakan untuk mengetahui respon suatu spesies terhadap komponen iklim. Penelitian ini bertujuan menganalisis dampak variabilitas dan perubahan iklim terhadap potensi serangan hama wereng batang coklat di wilayah Subang Utara. Fungsi yang digunakan dalam model Climex adalah compare years dan compare locations. Skenario iklim yang digunakan adalah RCP 4.5 dan RCP 8.5 dengan model CCSM4 dan MIROC5. Hasil penelitian menunjukkan bahwa pada tahun 2011-2020 (baseline) wilayah Subang Utara secara umum memiliki iklim yang sesuai untuk perkembangan wereng batang coklat dengan nilai EI sebesar 62. Adanya variabilitas iklim dapat berdampak pada perkembangan wereng batang coklat. Fenomena El-Nino dapat menurunkan nilai EI menjadi 46 (tahun 2015) dan 43 (tahun 2019). Terjadinya peningkatan suhu, perubahan pola curah hujan, dan naiknya permukaan laut pada tahun 2050-an dapat menurunkan nilai EI menjadi 45 dan 39 (CCSM4) serta 55 dan 50 (MIROC5)., Subang is one of the centers of rice production in West Java after Indramayu and Karawang. Fluctuations in rice production are inseparable from climatic factors and attacks by pests and diseases. Brown planthopper (Nilaparvata lugens Stal.) is a dangerous pest on rice plants because it can transmit other viruses. The Climex model is used to determine the response of a species to climate components. This study aimed to analyze the impact of climate variability and climate change on the potential attack of brown planthoppers in Northern Subang. The functions used in the Climex model are compare years and compare locations. The climate scenarios used are RCP 4.5 and RCP 8.5 with CCSM4 and MIROC5 models. The results showed that in 2011-2020 (baseline) Northern Subang had a climate suitable for the development of brown planthoppers with an EI value of 62. The existence of climate variability can have an impact on the development of brown planthoppers. Phenomenon El-Nino can decrease the EI value to 46 (in 2015) and 43 (in 2019). An increase in temperature, changes in rainfall patterns, and rising sea levels in the 2050s can decrease EI values to 45 and 39 (CCSM4) and 55 and 50 (MIROC5).
Keyword: climate change scenario, climex, compare locations, ecoclimatic index, pest suitability

Judul: Sifat optik dan sifat listrik diode schottky film Barium Titanat (BaTiO3) berstruktur emas - BaTiO3 (Metal – ferroelektrik)
Abstrak: Diode Schottky (emas - BaTiO3) berhasil dibuat dengan ditumbuhkan di atas permukaan interdigital electrode berbahan emas(Au) menggunakan metode Chemical Solution Deposition (CSD) . Film BaTiO3 dibuat dengan proses annealing pada suhu 400oC dengan variasi holding time annealing 4 jam dan 10 jam. Karakterisasi sifat optik diode Schottky dilakukan menggunakan UV-Vis Spektrofotometer untuk memperoleh nilai energi gap Film BaTiO3. Nilai energi gap BaTiO3 pada dua perlakuan holding time annealing 4 jam dan 10 jam sebesar 3.27 eV dan 3.21 eV dan nilai energi gap tersebut termasuk dalam kategori semikonduktor. Karakterisasi sifat listrik diode Schottky dilakukan menggunakan LCR Meter yang didapatkan nilai konduktivitas listrik pada Holding time annealing 10 jam lebih besar daripada 4 jam. Kemudian, didapatkan nilai impedansi yang menunjukkan bahwa pada holding time annealing 4 jam lebih besar daripada holding time 10 jam. Didapatkan pula nilai konstanta dielektrik yang menunjukkan pada waktu holding time annealing 4 jam lebih besar daripada 10 jam.
Keyword: Barium titanat, diode schotty, ferroelektrik, sifat optik, sifat listrik, emas, metal