Judul: Hubungan Retensio Sekundinae Dan Endometritis Pada Sapi Perah: Studi Kasus Di Koperasi Peternakan Bandung Selatan (Kpbs) Pangalengan, Jawa Barat
Abstrak: Retensio sekundinae dan endometritis merupakan gangguan reproduksi yang dapat menyebabkan kerugian ekonomi bagi peternak. Tujuan penelitian ini adalah untuk membuktikan adanya hubungan kejadian retensio sekundinae dan endometritis serta mengetahui pengaruhnya pada sapi perah. Penelitian dilaksanakan di Koperasi Peternakan Bandung Selatan (KPBS) Pangalengan, Jawa Barat. Data kejadian retensio sekundinae dan endometritis selama tahun 2011 sampai 2013 dianalisis secara deskriptif dan korelasi menggunakan aplikasi SPSS 22.0 untuk menyatakan ada atau tidaknya hubungan antara dua kejadian tersebut. Hasil menunjukan bahwa korelasi signifikannya yaitu 0.036 < 0.05. Hasil tersebut dapat dikatakan retensio sekundinae memiliki korelasi yang signifikan dengan endometritis. Nilai koefisien korelasinya positif yaitu 0.351 yang menunjukan bahwa jika jumlah kasus retensio sekundinae naik maka endometritis juga akan naik dan sebaliknya. Pengaruh kejadian tersebut yaitu dapat menurunkan tingkat kesuburan dan produksi pada sapi perah.
Keyword: endometritis, retensio sekundinae, sapi perah

Judul: Hubungan Retensio Sekundinae Danendometritisdenganefisiensi Reproduksi Pada Sapi Perah: Studi Kasus diKoperasi Peternak Sapi Bandung Utara (KPSBU) Lembang, Jawa Barat
Abstrak: This study aims to explore the relationship between retained placenta and endometritis with reproduction efficiency i.e. conception rate (CR) and service per conception (S/C) in dairy cows. The study was conducted at Koperasi Peternak Sapi Bandung Utara (KPSBU) Lembang, and Badan Meteorologi, Klimatologi, dan Geofisika (BMKG) Dramaga Bogor Station, West Java. Data of retained placenta, endometritis cases, and reproduction efficiency during 2007-2009 were collected from KPSBU Lembang, and data of rainfall during 2007-2009 were compiled from BMKG Dramaga Bogor Station, West Java. Descriptive and correlation analysis were applied in data processing. Correlation coefficient (r) and determination coefficient (r2%) were tested using Minitab version 14 to respectively show degree of relationship and influence between variables. The result shows that retained placenta has correlation with endometritis (r=0.013), CR (r = 0.279), S/C (r=-0.119), and rainfall (r=0.235). Endometritis is correlated with CR (r=0.264), S/C (r=-0.159), and rainfall (r=-0.198). The rainfall has correlation with reproduction efficiency (CR) (r=0.103) and (S/C) (r=-0.222). Retained placenta explains 0.017% of endometritis, 7.78% of CR, 1.42% of S/C, and 5.52% of rainfall. Endometritis illustrates 6.97% of CR, 2.53% of S/C, and 3.92 of rainfall. Rainfall clarifies reproduction efficiency 1.06% of CR and 4.93% of S/C. Thus, retained placenta, endometritis, and rainfall are factors influencing CR and S/C.
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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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