Judul: Pengelolaan panen dan pasca panen stroberi (Fragaria xananassa Duch) di Vin's Berry Park, Cisarua, Lembang, Jawa Barat
Abstrak: Kegiatan magang dilakukan untuk menambah pengetahuan, keterampilan, dan pengalaman penulis tentang aspek produksi, aspek teknis, aspek manajemen dan pengelolaan pada kondisi yang sebenarnya; membandingkan sistem budidaya stroberi secara konvensional dan sistem penanaman stroberi secara hidroponik, dan melakukan analisis usahatani stroberi. Magang dilaksanakan di Vin’s Berry Park, Cisarua, Lembang, Jawa Barat. Metode pelaksanaan magang dengan mengikuti seluruh kegiatan yang dilaksanakan di Vin’s Berry Park meliputi: budidaya stroberi, pemasaran dan agrowisata. Penulis juga melakukan observasi ke Kampung Langkop, Desa Alam Endah, Kecamatan Rancabali untuk membandingkan sistem budidaya yang dilakukan oleh petani di Kampung Langkop dengan sistem budidaya stroberi di Vin’s Berry Park. Data yang diperoleh terdiri dari data primer dan data sekunder. Data primer diperoleh dari pengamatan langsung di lapang dan hasil wawancara serta diskusi. Data sekunder diperoleh dari arsip perusahaan. Tanaman stroberi ditanam di dalam greenhouse menggunakan sistem hidroponik dengan populasi tanaman 1 600 – 2 000 polybag. Tanaman stroberi di Vin’s Berry Park merupakan hasil penanaman ulang. Penanaman ulang dilakukan secara bertahap. Tahap pertama dilakukan pada bulan Agustus 2009 (greenhouse A dan greenhouse C), tahap kedua bulan November 2009 (greenhouse B) dan tahap ketiga dilakukan pada pertengahan bulan Februari 2010 (greenhouse D).
Keyword: 

Judul: Pengelolaan Pembibitan Stroberi Di Vin’s Berry Park, Cisarua, Bandung Barat, Jawa Barat
Abstrak: The study was conducted at Vin’s Berry Pak, Cisarua, West Java, from February 15th until June 15th, 2010. The purpose of the study is to improve the knowledge, experience, skills and insights of students on the overall management of strawberry cultivation. The next is to compare the system of strawberry cultivation in farmer’s farm (conventional) with the system in Vin’s Berry Park (hydroponic). The spesific objective of this study is to examine and analyze aspects of nursery management on strawberry plants. The primary data obtained from observation and direct work in the field, interviews and discussion with staff employees, both managerial aspects and aspects of cultural. Secondary data obtained from data that already exist in companies which included geographical location and the farm, the climate, land area, production, employment, and organizational structure. The population of strawberry is 7400 that will be sampled two groups each containing 25 plants of strawberries. Each of strawberry plants that observed consists one parent plant and one seed. Each group will be given different treatment in the parent plants. Group 1 are fertilized only once a day in the morning. Group 2 are fertilized twice a day in the morning and evening. Fertilization interval is three times a week. Observations on the stolon and the seeds are conducted twice a week for four consecutive weeks. The observation of aspects of nurseries, especially in the growth of stolon length, stolon diameter, and height of seed showed different results. In stolon length, the average difference in Group 1 with Group 2 in the fourth week of 3.91 cm or 10%. In stolon diameter, the average difference in Group 1 with Group 2 in the fourth week of 0.44 mm or 15%. While the difference in average height seed of Group 1 with Group 2 in the fourth week of 0:39 inches or about 3.5%. In each of these variables, Group 2 had greater growth than Group 1. From observation it is concluded that giving larger doses of fertilizer had no significant effect on all variables observed. The observation of secondary data shows that crop productivity in Vin's Berry Park only 65.85 kg / month, far from the standard rate of productivity of 231.25 kg / month. This is because plants affected pests and plant age who had more than two years.
Keyword: 

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
Keyword: