Judul: Growth, nutrient uptake and morphophysiology characters responses on drought stress of oil palm seedling inoculated with AMF
Abstrak: Drought stress is one of the limiting factors in growth, nutrient uptake and yield of oil palm, particulary those which are planted on Red Yellow Podzolic (RYP) and peat soils. One of the alternatives to overcome this drougt stress problem on many plants is through inoculation with Arbuscular Mycorrhiza Fungi (AMF). AMF occurs n each rhizospere of certain plant in an ecosystem. Each ecosystem contains various kinds of AMF and each kind to AMF possesses different level of effectiveness in oil palm seedlings growing on various types of soil.
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Judul: Morpho-Physiological Response Of Grass Feed Drought Stress On The Inoculated AMF(Arbuscula mycorrhiza fungi).
Abstrak: The research was aimed to evaluate the morpho-physicology response of grass innoculated with AMF (Arbuscula mychorrhiza fungi). This experiment used factorial completely randomized design. First factor is combination of drought and aplication AMF consisting of W0M0 (watering and without AMF), W0M1 (watering and with AMF), W1M0 (drought and without AMF), W1M1 (drought and with AMF) and the second factor are 10 species of grasses consisting of Chloris gayana, Setaria Splendida, Panicum maximum, Brachiaria humidicola, Digitariadecumben, Paspalum dilatatum, Stenotatum secundatum, Brachiaria decumbens, Melinis minutiflora, Paspalum notatum. Result of analysis of variance showed that. Result of analysis of variance showed there is interaction between drought treatments and application AMF with plant species at all parameters (P<0,01). Treatment application AMF given the best value for all parameters Aplication AMF of drought stress significantly (P<0,01) incresing yield production, decreasing water water potensial, water defisit and leaf relative water content. Determination the best plant tolerance based on sensitivity drought index. Result that paspalum dilatatum have the highest score.
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Judul: Desain Sistem Transfer Energi Nirkabel Berbasiskan Tesla Coil
Abstrak: Tesla coil merupakan alat yang ditemukan oleh Nikola Tesla yang dapat mentransmisikan daya tanpa kabel dengan memanfaatkan prinsip induksi elektromagnetik. Pada penelitian ini dibuat sebuah prototype Tesla Coil dengan menggunakan transistor C1970 dan receiver menggunakan rangkaian LC. Identifikasi alat meliputi pengaruh daya input transmitter terhadap receiver, bentuk signal yang dipancarkan transmitter, pengaruh jarak transmitter dan receiver, nilai efisiensi serta efek alat terhadap perangkat lain. Hasil pengamatan menunjukkan bahwa semakin besar daya input maka semakin besar daya yang dipancarkan oleh transmitter. Bentuk sinyal yang dipancarkan oleh transmitter berupa gelombang listrik AC sinusoidal dengan frekuensi ~2.9 MHz. Semakin jauh jarak receiver terhadap transmitter maka semakin kecil amplitudo gelombang AC yang diterima oleh receiver, menyebabkan semakin kecil daya yang diterima oleh receiver. Adapun nilai efisiensi terbesar penangkapan daya oleh receiver yaitu sebesar 0.00516 % serta terdapat gangguan pada alat-alat tertentu seperti monitor komputer dan radio.
Keyword: rangkaian LC, receiver, tesla coil, transistor C1970, transmitter