Judul: Pendugaan Umur Itik Alabio dan Cihateup Berdasarkan Tempat Tumbuh Bulu Tetap pada Bagian-Bagian Tubuh
Abstrak: Duck selection for replacement is difficult for farmers, as day old duck (DOD) are generally sold in a group although they have different ages. The purpose of this study was to estimate the age of ducks (cihateup and alabio) through the growth of fixed feather on the body. A total of 143 alabio ducks eggs originate from Borneo and 32 cihateup ducks from Tasikmalaya had hatched in Animal Husbandry Hatching Laboratory then grew up at the Field Laboratory of Poultry Production, Bogor Agricultural University. The results showed that the overall changing of hatching feathers into fixed feathers on both types of ducks is observes successively from the chest, armpits, upper back, tail, lower back, neck, wing primary and secondary wings. The alabio ducks hatching feathers substitution into fixed feathers were faster than cihateup ducks. Cihateup ducks showed changing of hatching feathers into fixed feathers in its chest in weeks 4, while the alabio ducks showed changing in the chest, armpit and upper back on the same week. Alabio ducks changed all the fixed feathers in their body on weeks 6, mean while cihateup duck on weeks 7.
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Judul: Daya Tetas Telur Itik Cihateup dan Alabio
Abstrak: Local ducks in Indonesia such as alabio duck and cihateup duck have advantages as egg producer and meat producer. Efforts is needed to increase the population of ducks by doing hatching. This research is to learn the hatchability of alabio duck and cihateup duck and identify of the factors that can be affected hatching duck eggs. Eggs ducks used 200 grains eggs ducks cihateup and eggs ducks alabio 300 grains. The process of hatching the egg ducks held for 28 days. The percentage fertility and hatchability results duck eggs alabio higher than cihateup duck eggs. Death embryonic the biggest occurred on the day to 26-28 days. Greater egg weights produce larger DOD. Weight of eggs and duck eggs index has no effect on hatchability but which affect hatchability of duck eggs in this study is high temperature during incubation, lower humidity during the period hatcher and egg hygiene. Alabio duck egg weight is lighter than duck eggs cihateup and more oval shaped while cihateup duck eggs more rounded shape. Weight egg and index egg on two types of eggs uniforms.
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Judul: Aproksimasi Fungsi Sinus dan Kosinus sebagai Kombinasi Linear dari Fungsi Eksponensial
Abstrak: Salah satu gagasan yang menarik dalam matematika adalah aproksimasi suatu fungsi oleh fungsi lain. Sebagai contoh, fungsi polinom dapat diaproksimasi menggunakan deret Taylor atau fungsi persamaan diferensial dapat diaproksimasi menggunakan deret Fourier. Adapun fungsi yang dapat mengaproksimasi fungsi lain salah satunya adalah fungsi eksponensial. Kemungkinan mengaproksimasi fungsi dengan kombinasi linear dari fungsi eksponensial dari bentuk eˣ, e²ˣ, ... dianggap sebagai perkembangan sejajar dengan gagasan Deret Taylor yang mengaproksimasi fungsi dengan kombinasi linear dari segi fungsi kuadrat. Fungsi sin x dan cos x digunakan sebagai target untuk menilai seberapa baik aproksimasi yang dilakukan oleh fungsi yang diberikan. Aproksimasi fungsi sinus dan kosinus menggunakan hampiran Taylor lebih akurat dibandingkan dengan aproksimasi menggunakan fungsi eksponensial.
Keyword: Aprosimaksi eksponensial, aproksimasi fungsi, aprosimaksi Taylor, fungsi eksponensial