Judul: Analisis Infiltrasi Tanah pada Berbagai Penggunaan Lahan di Kebun Percobaan Cikabayan, Dramaga
Abstrak: Infiltration rate of soil is influenced by a variety soil properties, such as soil texture, type of clay mineral, soil structure, aggregate stability, soil water content, soil organic matter content, soil pore distribution, and land use. The purpose of this study was to determine the infiltration rate of the soil on several land uses, and soil infiltration relationships with other soil properties, especially soil aggregate stability, organic matter content, and the content and type of cation. The result showed that the initial soil infiltration rate (t = 0,05 hour) was highest on Durian Garden 90 cm/hr, followed by Open Land 80 cm/hr, Cassava Garden 79 cm/hr, and the lowest in Rubber Garden 60 cm/hr. The initial soil infiltration rate is more determined by initial soil water content. Rubber Garden have the lowest soil infiltration rate because it has the highest initial soil water content. Cassava Garden has a constant infiltration rate of 7,80 cm/hr that classified as slightly fast. Infiltration rate constant on Rubber Garden 6,00 cm/hr, followed by Durian Garden 5,40 cm/hr, and Open Land have the lowest infiltration rate constant of 5,20 cm/hr which all classified as medium. Based on observations made soil infiltration rate is not always influenced by land use and some soil properties such as high aggregate stability, organic matter content, and exchangeable cation. Initial soil moisture condition controls initial soil infiltration rate. Tuber formation can loosen the soil so as to stimulate the movement of water into the ground to be faster.
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Judul: Keragaan Infiltrasi Tanah Latosol pada Beberapa Penggunaan Lahan di DAS Ciujung
Abstrak: Land use is an important aspect in maintaining ecosystem sustainability, particularly in the watershed ecosystem. Land use determines to physical, chemical, and biological characteristics of soil. These soil characteristics influence to the growth of plants and the performances of water infiltration into soil. Infiltration is an essential part of the hydrological cycle that has an important role water availability in the soil. Infiltration process have an important role to the distribution of rainfall and control to runoff, flood, erosion and ground water storage and finally will determines the availability of river discharge in dry season. The aims of this research is to assess the performance of soil infiltration in various land use in Ciujung watershed. The study was conducted on three land use types that included plantative forest (HT), dense mixed garden (KCR), and less-dense mixed garden (KCTR). The field observation was done by using the Double Ring infiltrometer method, while the the analysis of the physical and chemical and other soil characteristics were done in the Laboratory of Soil and Water Conservation, Department of Soil Science and Land Resources, Faculty of Agriculture. The results of this research showed that the infiltration rate is strongly influenced by land use. Infiltration rate is the highest and most stable on HT land use, followed by KCR and KCTR. Constant infiltration rate at HT and KCR is belonging to quickly class, while at KCTR is relatively moderate to fast. The magnitude of the rate constant infiltration in HT (23.4 cm h-1) is higher than KCR (13.2 cm h-1) and KCTR (6.0 cm h-1). The high rate infiltration of the soil on the land use of HT support it able to accommodate as much water (6.45 dm3) that higher than at KCR (3,66 dm3) and at KCTR (1.52 dm3). Infiltration rate is influenced by pores with large size (PDSC), while the volume of water infiltration is more influenced by the total porosity of the soil. Besides it is influenced by land use, soil infiltration in the study area is also determined by the physical and chemical characteristic of the soil organic matter, bulk density, total porosity, aggregate stability, macro pores, very fast drainage pore (PDSC), and soil texture.
Keyword: Bogor Agricultural University (IPB), infiltration volume., physical and chemical characterstics of soil, land use, Infiltration rate

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