Judul: Performa Penetasan Ayam SENKUB di Kandang Inti Desa Tunggulo dengan Lama Penyimpanan Telur yang Berbeda
Abstrak: Telur sebelum inkubasi disimpan terlebih dahulu di ruang penyimpanan telur untuk mencukupi kapasitas telur dalam mesin tetas. Penelitian ini bertujuan mengkaji pengaruh lama penyimpanan telur ayam SENKUB terhadap performa penetasan. Bahan yang digunakan adalah 120 butir telur ayam SENKUB. Rancangan yang digunakan adalah Rancangan Acak Lengkap (RAL) dengan 3 perlakuan dan 5 ulangan. Perlakuan yang digunakan adalah lama penyimpanan telur yang terdiri atas 3 hari (P1), 5 hari (P2), dan 7 hari (P3). Parameter yang diamati meliputi penyusutan bobot telur, kedalaman kantung udara, fertilitas, daya tetas telur fertil, bobot tetas, salable chick, dan fase kematian embrio. Hasil penelitian menunjukkan lama penyimpanan telur tetas ayam SENKUB kurang dari 5 hari memiliki hasil performa penetasan yang baik. Penyimpanan yang semakin lama pada telur tetas menyebabkan penurunan kualitas telur yang ditandai dengan menurunnya nilai fertilitas, daya tetas telur fertil, dan salable chick, namun nilai penyusutan bobot telur dan bobot tetas relatif sama. Fase kematian embrio terjadi pada fase awal inkubasi dan akhir inkubasi. Penyebab kematian embrio sebagian besar disebabkan oleh penanganan telur saat proses penetasan., Eggs before incubation are first stored in the egg storage room to meet the egg capacity in the incubator. This study aims to determine the effect of storage time for SENKUB chicken eggs on hatching performance. The material used is 120 eggs of SENKUB chicken. The design used was a Complete Random Design (CRD) with 3 treatments and 5 replications. The treatments used were egg storage times consisting of 3 days (P1), 5 days (P2), and 7 days (P3). Parameters observed included weight loss of eggs, depth of air sacs, fertility, hatchability of fertile egg, hatching weight, salable chick, and embryonic death phase. The results showed that the storage time for hatching eggs of SENKUB chickens of less than 5 days had food hatching performance. The longer storage of hatching eggs causes a decrease in egg quality which is indicated by a decrease in the value of fertility, hatchability of fertile egg, and salable chick, but weight loss of egg and hatching weight are relatively the same. The embryonic death phase occurs in the early and late incubation phases. The cause of embryo death is mostly due to the handling of the eggs during the hatching process.
Keyword: SENKUB chicken, Egg storage time, The hatching performance

Judul: External Quality of Hatching Eggs of Ayam  Kampung Unggul Balitbangtan (KUB) from Different Hen Ages
Abstrak: Peningkatan umur ayam dapat menyebabkan warna kerabang telur semakin pudar, kerabang telur semakin tipis dan bobot telur semakin berat sehingga menurunkan kualitas telur yang dihasilkan. Tujuan penelitian adalah menganalisis perbedaan kualitas eksternal telur tetas ayam KUB dari induk parent stock (PS) yang berumur 40 dan 60 minggu yang berasal dari pembibitan ayam Taman Teknologi Pertanian (TTP), Cigombong, Bogor, Jawa Barat. Kualitas eksternal telur yang diamati meliputi bobot, bentuk telur, indeks bentuk telur, bobot kerabang, kebersihan kerabang, warna kerabang dan tebal kerabang telur. Jumlah telur yang diamati sebanyak 30 butir setiap kelompok umur. Data yang diperoleh dianalisis dengan statistik deskriptif yaitu pada kebersihan kerabang, bentuk telur, warna kerabang, dan kehalusan kerabang. Uji T (T-Test) independen digunakan untuk menganalisis data bobot telur, indeks bentuk telur, bobot kerabang dan ketebalan kerabang. Hasil penelitian menunjukan perbedaan yang nyata (P<0,05) pada bobot telur, indeks bentuk telur, bobot kerabang dan ketebalan kerabang. Penelitian ini menduga faktor lingkungan kandang, dan juga kesehatan ayam juga menentukan kualitas eksternal eksternal telur., The increasing of hen age may reduce the hatching egg color and shell thickness, and also increase the hatching egg weight. The aim of the study was to analyze the differences in the external quality of hatching eggs from 40 (P1) and 60 weeks of age (P2) of KUB chicken parent stock produced by chicken breeding farm TTP Cigombong, Bogor, West Java. The external hatching egg quality observed were included off the weight, egg shape, egg shape index, shell weight, shell cleanliness, shell color and egg shell thickness. There were 30 hatching eggs which were observed in this study for each age of group. The shell cleanliness, egg shape, shell color and shell smoothness were analyzed descriptively. The egg weight, egg shape index, shell weight and shell thickness was analyzed by T test (T-Test) independent. There were significantly differences (P< 0.05) in the egg weight, shell weight, and hatching egg shell thickness between hatching eggs produced by hens aged 40 (P1) and 60 weeks (P2). This study predicts that the environmental factor, and also chicken health might influence the external quality of chicken hatching egg.
Keyword: hatching egg, hen age, KUB chicken, parent stock, quality

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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