Judul: The use of Temu Ireng (Curcuma aeruginosa  Roxb) and Eggshell in Feed on the Quality of Storage Chicken Eggs.
Abstrak: Kualitas telur akan menurun selama penyimpanan dipengaruhi kualitas kerabang dan oksidasi. Penelitian ini bertujuan mengevaluasi pengaruh penggunaan temu ireng (TI) dan kerabang telur (KT) pada pakan terhadap kualitas telur serta kadar MDA yang disimpan pada suhu ruang selama 3 minggu. Penelitian ini menggunakan 72 ekor ayam Lohman Brown fase II umur 45-49 minggu dengan Rancangan Acak Lengkap (RAL) Faktorial 3 x 4 dengan 4 ulangan. Faktor A adalah penambahan suplemen TI+KT ke dalam pakan (0%, 0,15%, 0,3%). Faktor B adalah lama penyimpanan (0, 7, 14, 21 hari) di suhu ruang. Hasil penelitian ini menunjukkan bahwa penggunaan TI+KT cenderung menurunkan kadar MDA pada hari ke-14. Lama penyimpanan selama 7 hari menurunkan bobot telur, nilai haugh unit, indeks kuning telur, indeks putih telur, persentase bobot putih telur dan meningkatkan persentase bobot kuning telur. Skor warna kuning telur menurun pada lama penyimpanan ke-21 hari. Penambahan TI+KT sampai 0,3% serta penyimpanan hingga 21 hari tidak memengaruhi tebal kerabang telur. Simpulan penelitian ini yaitu penggunaan TI+KT tidak mempengaruhi kualitas telur, tetapi lama penyimpanan mempengaruhi kualitas telur., Egg quality will decrease during storage due to eggshell quality and oxidation. This study aimed to evaluate the effect of using temu ireng (TI) and eggshells (KT) in the diet on egg quality and MDA levels stored in room temperature for 3 weeks . The research used 72 Phase II Lohman Brown chickens aged 45-49 weeks with a 3 x 4 Factorial Completely Randomized Design (CRD) with 4 replications. Factor A was the addition of TI+KT supplements to the diet (0%, 0.15%, 0.3%). Factor B was the storage time (0, 7, 14, 21 days) at room temperature. The results showed that there was no effect between the use of TI+KT reduce MDA levels on day 14. Storage for 7 days lowered egg weight, haugh unit, egg white index, and increased egg yolk index. Egg yolk colour score decreased at storage up to 21 days. The addition of TI+KT up to 0.3% and storage up to 21 days did not affect the thickness of eggshells. The best results were shown by increasing the level TI+KT up to 0.3% without long storage, whereas after storage the best egg quality was obtained from the control treatment. The conclusion of this study is that the use of TI+KT there was no effect for egg quality, but storage duration affects egg quality.
Keyword: kerabang telur, kualitas telur, penyimpanan, temu ireng

Judul: Quality of Eggs Stored without Egg Trays in Room Temperature and Refrigerator Temperature
Abstrak: Telur merupakan pangan asal hewan dengan kandungan nutrisi yang lengkap, seperti protein, lemak, vitamin, dan mineral. Lama dan suhu penyimpanan dapat mengakibatkan penurunan kualitas telur. Penelitian ini bertujuan untuk mengevaluasi perubahan nilai Haugh Unit, indeks kuning telur, dan indeks albumin telur yang disimpan tanpa rak selama 21 hari. Penelitian ini menggunakan 40 butir telur ayam. Sebanyak 20 telur disimpan pada suhu ruang dan 20 telur lainnya disimpan pada suhu refrigerator. Seluruh telur disimpan dalam wadah tanpa diatur. Pengujian dilakukan terhadap nilai Haugh Unit (HU), indeks kuning telur (IKT), dan indeks albumin (IA) pada hari ke-0, ke-7, ke-14, dan ke-21 penyimpanan dari setiap suhu perlakuan. Setiap pengujian menggunakan 5 sampel telur. Desain penelitian menggunakan metode rancangan acak lengkap dua faktorial dan uji Tukey. Hasil penelitian menunjukkan terjadinya penurunan nilai HU, IKT, dan IA. Penurunan nilai HU, IKT, dan IA berbeda nyata (p < 0,05) antara suhu kamar dan refrigerator. Suhu dingin (refrigerator) dapat mempertahankan kualitas telur ayam., The egg is one of the food of animal origin containing complete nutrients, e.g., proteins, fats, vitamins, and minerals. Storage period and temperature can decrease egg quality. This study aimed to evaluate the change in Haugh Unit, yolk index, and albumin index of eggs that storaged for 21 days without egg tray. This study used forty chicken eggs. Twenty eggs were stored at room temperature, while the twenty other eggs were stored at refrigerator temperature. All eggs were put in bowl. The examination of eggs were carried out for Haugh Unit (HU), yolk index (YI), and albumin index (AI) at the storage of day 1, 7, 14, and 21 from each storage temperature. Every examination used 5 eggs. The study was designed using randomized block design with two factorials and Tukey test. This study showed that HU, YI, and AI of eggs in both temperature decreased. The decrease of HU, YI, and AI was significantly different (p < 0,05) between both temperatures. The storage of eggs in refrigerator could keep the quality of eggs.
Keyword: Haugh Unit, indeks albumin, indeks kuning telur, suhu refrigerator, suhu ruang

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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