Judul: The  revenue  analysis  and technical efficiency of  cassava  farming  in  galuga  village,  cibungbulang  district,  Bogor  regency
Abstrak: Ubi kayu merupakan salah satu komoditas tanaman pangan yang penting di Indonesia karena relatif mudah dibudidayakan dan juga mengandung karbohidrat yang dapat digunakan sebagai pengganti beras. Desa Galuga dipilih sebagai lokasi penelitian karena merupakan salah satu sentra produksi ubi kayu terbesar di Kabupaten Bogor. Tujun penelitian ini adalah untuk mengetahui keragaan, tingkat pendapatan, serta efisiensi treknis usahatani ubi kayu di Desa Galuga. Keragaan usahatani dianalisis secara deskriptif, pendapatan usahatani menggunakan rasio R/C, serta efisiensi teknis dengan metode OLS (Ordinary Least Square) dan MLE (Maximum Like-lihood Estimated). Hasil analisis keragaan usahatani dalam hal budidayanya masih perlu dibenahi pada tahap persiapan lahan, penanaman, dan pemupukan. Pendapatan petani atas biaya tunai dan total bernilai positif. Rasio R/C atas biaya tunai sebesar 12.35 dan atas biaya total 1.67. Sehingga dapat dikatakan usahatani ubi kayu di Desa Galuga menguntungkan. Kemudian rata-rata efisiensi teknis petani sebesar 65.5 persen. Oleh karena itu, usahatani ubi kayu di Desa Galuga dapat dikatakan masih kurang efisien, Cassava is one of the important food crops in Indonesia because it is relatively easily cultivated and also contain carbohydrates that can be used as a substitute for rice. Galuga village selected for the study because it is one of the largest cassava production center in Bogor Regency. The purpose of this study are to determine the Performance, level of income, as well as the technical efficiency of cassava farming in the Galuga village. The performance farming analyzed descriptively, farming income using the ratio of R/C, and technical efficiency using OLS (Ordinary Least Square) and MLE (Maximum Like-lihood Estimated). The analysis result of the performance farming in terms of cultivation farming still needs to be addressed at the stage of land preparation, planting, and fertilizing. Farmers' income over cash and total costs are positive. The ratio of R/C on cash cost is 12.35 and the total cost is 1.67. So it can be said that cassava farming in Galuga village is profitable. Then the average technical efficiency of farmers is 65.5 percent. Therefore, cassava farming in the Galuga village can be said is less efficient.
Keyword: Efisiensi Teknis, Frontier, MLE, Rasio R/C

Judul: Analysis of Factors Affecting Interest of Young Farmer Families to Work in Cassava Farming (Case Study: Benteng Village, Ciampea District, Bogor Regency)
Abstrak: Kabupaten Bogor termasuk dalam kawasan khusus pengembangan ubi kayu berdasarkan Keputusan Menteri Pertanian No. 03/Kpts/PD. 120/1/2015. Salah satu penghasil ubi kayu Kabupaten Bogor terletak di Desa Benteng, Kecamatan Ciampea. Ubi kayu menjadi komoditas unggulan dan sumber pendapatan bagi petani di Desa Benteng. Petani ubi kayu didominasi oleh petani berumur tua, hal ini diindikasi karena kurangnya ketertarikan generasi muda Desa Benteng terhadap usahatani ubi kayu sehingga perlunya regenerasi untuk keberlanjutan usahatani ubi kayu di Desa Benteng. Penelitian ini bertujuan untuk (1) menganalisis persepsi pemuda keluarga tani terhadap usahatani ubi kayu di Desa Benteng, (2) menganalisis pendapatan usahatani ubi kayu di Desa Benteng, (3) menganalisis faktor-faktor yang memengaruhi minat pemuda keluarga tani untuk bekerja pada usahatani ubi kayu di Desa Benteng. Metode analisis data yang digunakan adalah skala likert, analisis pendapatan, dan regresi logistik biner. Hasil penelitian menunjukkan bahwa persepsi pemuda secara keseluruhan terhadap usahatani ubi kayu memiliki persepsi positif atau setuju namun tidak setuju terhadap kategori risiko usahatani ubi kayu. Nilai R/C rasio lebih dari satu yang artinya usahatani ubi kayu di Desa Benteng menguntungkan. Faktor-faktor yang berpengaruh secara signifikan terhadap minat pemuda keluarga tani pada usahatani ubi kayu adalah jenis kelamin, pendapatan usahatani orang tua dan pengalaman usahatani., Bogor Regency is included in a special area for cassava development based on the Decree of the Minister of Agriculture No. 03/Kpts/PD. 120/1/2015. One of the centers of cassava in Bogor Regency is located in Benteng Village, Ciampea District. Cassava is a leading commodity and source of income for farmers in Benteng Village. Cassava farmers are dominated by old age farmers, this is indicated because of the lack of interest of the younger generation of Benteng Village towards cassava farming so that regeneration is needed for the sustainability of cassava farming in Benteng Village. This study aims to (1) analyze the perception of young farming families on cassava farming in Benteng Village, (2) analyze the income of cassava farming in Benteng Village, (3) analyze the factors that influence the interest of young farming families to work in cassava farming. wood in the Fort Village. Data analysis methods used are Likert scale, income analysis, and binary logistic regression. The results showed that the youth's overall perception of cassava farming had a positive perception or agreed but disagreed with the risk category of cassava farming. The value of the R/C ratio is more than one, which means that cassava farming in Benteng Village is profitable. Factors that significantly influence the interest of young farming families in cassava farming are gender, parents' farm income and farming experience.
Keyword: binary logistic regression, cassava, income analysis, perception, Likert scale

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