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: Nisbah Jenis Kelamin Hasil Penetasan Telur Itik Cihateup dan Alabio
Abstrak: Duck eggs are more difficult to hatch than chicken eggs as the duck does not incubate their eggs and the duck eggs need more time to hatch (in 28 days). This study aimed to determine the sex ratio of DOD (Day Old Duck) from two different breeds, namely cihateup from Tasikmalaya West Java and alabio from South Kalimantan. This experiment was conducted from May 2012 to July 2012 at the Hatchery Laboratory of Animal Science Faculty of IPB. 500 eggs consist of 300 alabio eggs and 200 cihateup eggs were used in this experiment. Temperature, humidity, egg weight, egg shape index, hatching weight and mortality were measured. The data of egg weight, egg shape index, and hatching weight were analyzed using t-test, the data of sex ratio DOD were analyzed using chi-square test. The result showed that there were no significant difference between egg weight and egg shape index on sex ratio. Sex ratio of male and female cihateup ducks was equal (50%:50%), however the sex ratio of alabio ducks was different (32%:68%). Mortality rate was affected by sex of duck (P<0.05). The Higher mortality was occured at early (day 0-7) and late (day>25) hatching period.
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Judul: Metode generalized minimal residual(GMRES) dalam menyelesaikan sistem persamaan linear
Abstrak: Metode GMRES (Generalized Minimal Residual) adalah salah satu metode proyeksi subruang Krylov Kapan(r. Ar Aro) untuk menyelesaikan sistem persamaan linear tak-simetrik. Metode ini diperkenalkan oleh Saad dan Schultz tahun 1986. Cara kerja metode GMRES tampak pada algoritma GMRES. Pada algoritma GMRES terdapat 2 tahap dalam menyelesaikan masalah sistem persamaan linear yaitu tahap penentuan basis dan tahap penentuan solusi. Perbedaan yang nyata antara metode GMRES dengan metode yang lain (baik yang menggunakan bantuan subruang Krylov maupun yang tidak menggunakan subruang Krylov) adalah dalam mendapatkan solusi. Pada setiap iterasi algoritma GMRES, selain diperoleh basis subruang Krylov, dapat diperoleh pula estimasi besarnya residu tanpa menghitung solusi aproksimasi pada iterasi tersebut. Dari implementasi metode GMRES yang diterapkan pada matriks JPWH 991, tampak bahwa metode GMRES jauh lebih efisien dalam hal memori yaitu 177.768 bytes, sedangkan metode Gauss memerlukan memori minimal sebesar 982.081 bytes. Juga dalam hal banyaknya operasi floating point (dalam hal ini berhubungan dengan waktu yang digunakan) metode GMRES jauh lebih unggul dibandingkan dengan metode eliminasi Gauss.
Keyword: Generalized Minimal Residual Method, subspace projection methods, non-symmetric linear equations