Judul: Perbedaan Kualitas Nutrisi Hijauan Pada Musim Hujan dan Kemarau Serta Pengaruhnya terhadap Produksi dan Kualitas Susu di Kampung Barunagri, Lembang, Bandung Utara.
Abstrak: Availabilities of quality forages fluctuated during the year. In dry season, where plants grow slower and their qualities drop rapidly, is one of the hardest season for dairy farmer. High cattle stocking rate and limited available land hit the farmer harder. Barunagri village is one of the cattle stocking rate in Lembang Regency. The farmer experienced the difficulties of affording forage during dry season for several years. The research was aimed to studying the influence of season on availability quality forage and their impact on milk production and quality. The study have been conducted during wet and dry season (2007/2008) and observed 27 respondent from 8 different farmer groups. The study used both primary and secondary data. Parameter observed in the study included availability of quality forage, feed intake, milk production and quality. The data were described or analyzed used T-test. During dry seasons, forage qualities and availabilities as well as milk production were significantly lower in compare to wet season. However, milk fat contents were higher during dry season. Although Barunagri farmer had difficulties in affording high quality forages for their cows during dry seasons, but the farmer provided forage with lower quality and added with some agriculture by product that could maintained body weight of the animal but lowering milk production.
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Judul: Evaluasi Kecukupan Nutrien Sapi Perah pada Musim yang Berbeda di Koperasi Peternak Sapi Bandung Utara (KPSBU) Lembang
Abstrak: This research was aimed at evaluating dairy cows nutritional status on milk production and quality in different rainfall. The research was done from September 2012 until June 2013 for field survey and laboratory analysis. Body weight, feed intake, nutrient contents, milk production, and milk quality have been measured and analyzed. The data were analyzed using T-test to compare the differences rainfall effect, correlation between all parameters heve been tested and regression model of milk production and quality have been made based on the correlation test. The results showed that in average dairy cows kept by small holder famer under KPSBU administration has been offered feed to fulfilled their nutrients requirement,except for mineral Ca. During early rainy, milk production, lactose, protein, and solid non fat (SNF) tends to be lower, but milk quality especially fat content of milk were higher. No satisfaction regression of milk production and quality model could be made from the parameters used which show that farmers did not consider cow performance in feeding their cattle.
Keyword: nutrient adequacy, milk quality, milk production, dairy cows

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