Judul: Karakter Agronomi Tanaman Aren (Arenga pinnata (Wurmb) Merr.) untuk Produksi Nira
Abstrak: This research was aimed to study the agronomic performance of tapped sugar palm tree and their sap production. Experiment used 15 productive trees of sugar palm that were tapped by 3 farmers. The observation including volume of sap every morning and evening for each male infloresence while brown sugar was observed everyday per farmer. Results showed that sugar palm trees in the research site of Desa Salagedang, Kecamatan Cibeber, Kabupaten Cianjur, have range of trunk height between 6.9 – 20.3 m, with a trunk circumference of 0.5–1.53 m and up to the 14th position of the male infloresence, it can still be taped for 50 days and producing sap with volume until 233.3 liters. Growth environment of sugar palm in the research sites had a pH range of 5.0–6.4, range of the light intensity under the canopy near the soil surface from 1243–49012 lux, and range of the temperature from 25.7–31.3 oC with a relative humidity of 53.7–78%. Sap production of male infloresence varied in the range of 6.5–1045.7 liters with an average 5.4 liters per infloresence perday, with tapping period range between 2–167 days. Morning tapping (with an average 118 liters/infloresence and averaging 3.1 liters per day per infloresence) generally 40.3% higher than evening tapping (with an average 84.1 liters/infloresence and averaging 2.2 liters per day per infloresence). Brown sugar that was produced has a yield approximately 14.2% of brown sugar weight of sap volume. Arenga sap has content 0.12% of fructose, 0.16% of glucose, and 12.47% of sucrose with a total 12.75%.
Keyword: 

Judul: Standing and Habitat Condition of Sugar Palm (Arenga pinnata. (Wurmb.) Merr.) ‎in Hariang Village, Sobang District, Lebak Regency, Banten Province.
Abstrak: Pemanfaatan nira aren di desa hariang sudah dilakukan untuk waktu yang ‎cukup lama, oleh karena itu dilakukan penelitian untuk mengetahui seberapa besar ‎potensi nira aren yang dapat di manfaatkan. Penelitian ini bertujuan untuk ‎menduga potensi tegakan aren yang dapat di produksi niranya, mengidentifikasi ‎tingkat regenerasi serta pola persebaran, mengetahui tipologi habitat aren, serta ‎mengidentifikasi spesies vegetasi yang tumbuh di sekitar habitat aren. Penelitian ‎dilakukan pada kedua lereng yang menghadap kearah mata angin barat dan timur ‎dengan menggunakan metode observasi lapang, wawancara kepada beberapa ‎narasumber, analisis vegetasi dengan ukuran plot 20m x 20m, serta mencari ‎beberapa literatur yang sebagai acuan dan pendukung untuk hasil yang di dapat ‎dalam penelitian. Pada hasil penelitian di temukan persentase potensi tumbuhan ‎aren yang dapat di produksi sebesar 3% pada desa Hariang. Tingkat regenerasi ‎aren yang di dapat berada pada kategori bagus dengan pola persebaran yang ‎seragam. Sebanyak 48 jenis tumbuhan di temukan pada habitat aren. Vegetasi ‎hutan di sekitar desa hariang tergolong kedalam hutan rakyat dengan pola kebun ‎campuran. Hasil dari penelitian ini dapat dijadikan sebagai data tambahan dalam ‎upaya pengelolaan habitat aren.‎, Utilization of palm sap in Hariang village has been carried out for quite a ‎long time, therefore a study was conducted to find out how much potential palm ‎sap can be utilized. This study aims to estimate the potential of sugar palm stands ‎that can be produced for sap, identify the level of regeneration and distribution ‎patterns, determine the typology of sugar palm habitat, and identify vegetation ‎species that grow around the sugar palm habitat. The study was conducted on ‎both cliffs, each facing the west and east cardinal directions using field ‎observation methods, interviews with several sources, analysis of vegetation with ‎a plot size of 20m x 20m, and looking for some literature that can be used as a ‎reference and support for the results obtained. obtained in research. In the results ‎of the study, it was found that the percentage of potential sugar palm plants that ‎could be produced was 3% on Hariang village. The level of regeneration of sugar ‎palm that can be obtained is in the good category with a regular distribution ‎pattern. A total of 48 species of plants were found in the sugar palm habitat. The ‎forest vegetation around Hariang village is classified as community forest with ‎mixed garden pattern. The results of this study can be used as additional data ‎needed in efforts to manage sugar palm habitat.‎
Keyword: potential, sugar palm, typology

Judul: Peluang Partikel Plasma Berada Pada Dimensi Debye Akibat Gangguan Gelombang Elektromagnetik dengan Menggunakan Persamaan Schrödinger
Abstrak: The solution of Schrodinger equations with plasma Coulomb potential in spherical coordinat results solution wave function and energy plasma particle. Electron probability density at Debye length with thermal effect same as ion, which indicates plasma in neutral state. Electromagnetic waves perturbation of an electric field given to result wave function perturbation system. The probability density of plasma particle due to electromagnetic waves perturbation is the largest when an electromagnetic waves frequency 1.41 times the plasma frequency .
Keyword: Schrödinger, plasma, electromagnetic wave