Judul: Motivation and Interest Buffalo Breeders in
Development of Sekolah Peternakan Rakyat (SPR) Program in North Musi Rawas
Utara District.
Abstrak: Kabupaten Musi Rawas Utara merupakan salah satu Kabupaten yang berada di Provinsi Sumatera Selatan. Masyarakat Kabupaten Musi Rawas Utara juga memilih berprofesi sebagai peternak kerbau. Pentingnya memberikan dedikasi pada peternak mengenai cara beternak yang efektif, efisien hingga cara berbisnis ternak yang menguntungkan mereka, salah satunya adalah program Sekolah Peternakan Rakyat (SPR). Tujuan dari penelitian ini adalah menganalisis tingkat motivasi, minat, dan hubungan antara motivasi dan minat peternak kerbau terhadap pembangunan SPR. Responden penelitian berjumlah 43 orang dipilih dengan metode purposive sampling yang merupakan peternak kerbau dari Desa Maur, Bingin Rupit, dan Surulangun. Data diolah menggunakan analisis regresi linear berganda dan korelasi rank Spearman. Hasil analisis menunjukkan bahwa motivasi peternak didasarkan pada indikator relasi dengan kelompok ternak dan meningkatkan kesejahteraan hidup. Minat peternak terhadap pengembangan SPR termasuk kedalam kategori sangat tinggi. Faktor eksternal yang memengaruhi minat peternak hanya faktor jaminan harga., Musi Rawas Utara Regency is one of the regencies in South Sumatra Province. The people of Musi Rawas Utara Regency also choose to work as buffalo farmers. It is important to dedicate efforts to educating farmers on effective and efficient farming methods, as well as profitable livestock business practices, one of which is the Sekolah Peternakan Rakyat (SPR) program. The aim of this research is to analyze the level of motivation, interest, and the relationship between motivation and interest of buffalo farmers towards the development of SPR. The study's respondents numbered 43, selected using purposive sampling method, consisting of buffalo farmers from Maur, Bingin Rupit, and Surulangun villages. Data were processed using multiple linear regression analysis and Spearman’s rank correlation. The analysis results showed that the farmer’s motivation is based on indicators such as relationships with livestock groups and improving living standards. Farmer’s interest in the development of SPR falls into the very high category. The external factor influencing farmer’s interest is only the price guarantee factor.
Keyword: motivasi, Sentra Peternakan Rakyat, minat

Judul: New Initiative to Build a Breeding Business of Bali Cattle Based on Community in Field Station of Sekolah Peternakan Rakyat (SL-SPR)
Abstrak: The government has launched a meat self-sufficiency program to meet meat needs since 2005. The main target was to increase the population of cattle in smallholder farmers. The problem is that there are no records and data on smallholder farmers so that it is difficult to increase the population of cattle. The purpose of this study was to (1) produce baseline data on the productive and reproductive performance of Bali cattle and their supporting factors which are used as the basis for starting recording at SL-SPR Maju Bersama (2) to analyze the carrying capacity with feed production and the carrying capacity index of forage land (3) to analyze the projection of Bali cattle population in the next 10 years so that it can be used as basic data to start a breeding business. The research was conducted at SL-SPR Maju Bersama, Sungai Lilin District, Musi Banyuasin Regency in October-December 2019. The material used in this study was the all population of bali cattle, totaling 330 head of the dam belonging to 219 farmers in SL-SPR Maju Bersama, Sungai Lilin District. This study was used survey methods and direct observation of the research object. The parameters analyzed were the potential of bali cattle, reproductive performance, the potential of feed resources and carrying capacity as well as the projection of the bali cattle population for the next 10 years based on 3 simulations, constant, improvement through the SPR program, and intervention of SPR with the government. Data were analyzed using descriptive analysis by presenting the test results in tabular form as well as the non-parametric Kruskal Wallis test to analyze the influence of factors that affect the reproductive performance of the dam. The projection of bali cattle population was calculated by the Microsoft Excel program. The results showed that the population of bali cattle in SL-SPR Maju Bersama was 1 277 heads. The dam as much as 72.7% came from non-groups, while the others were born and came from in the SPR group; 87.9% owned by themselves, while the others were profit sharing; 70% maintained intensively while the others maintained by semi-intensively and extensively; 58% mated by AI, while the others by natural; 24.5% were in the age range of 3-4 years and 43.0% had a BCS value of 3. The reproductive performance was obtained, age first calving 1 098 ± 12 days; calving interval 455.4 ± 8.33 days; days open 169.4 ± 8.33 and service per conception 5.37 ± 0.42. The origin and age of the dam had a significant effect on calving interval, days open and service per conception (P <0.05). Ownership status had a significant effect (P <0.05) on the age first calving. The total production of feed obtained from forages and agricultural crop residues as much as 15 646.92 tonnes of DM per year with a capacity of 6 259 AU and a capacity to increase the population of ruminants by 5 063 AU. The projection of the bali cattle population for the next 10 years with constant projections, projections with the SPR program and projections of SPR intervention with
Keyword: Bali cattle, Sekolah Peternakan Rakyat, reproductive performance

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.
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