Judul: Analisis Daya Tahan Pengguna Nomor Kartu Prabayar Telekomunikasi
Abstrak: Telecomunication prepaid customer has increased significanly compared to postpaid customers. The growth in prepaid is driven by a end-to-end simple ecosystem that is built by telecommunication operator, for example started pack can be bought anywhere anytime, retail outlet for voucher can be found everywhere. That simplicity has been creating another effect to customer in which they can easily switch sim card after the balance run out.That behavior driven by regulation in buying prepaid SIM that not optimum in which customer data can not be validated. The impact of rotational prepaid customer gives a high cost to telecommunication provider and the availability of number becomes limited. For customers, the impact of rotational SIM has made them vulnerable from spamming. Those impact can be minimized if regulator and telecommunication operator knows the factors that drives customer changing their SIM cards.This study is to define the factors which has driven customers in buying new SIM cards, by survival model of prepaid customers and to define the probability loyal customer based on significant characteristics. Data in this study is based on survey to 300 prepaid customers in DKI Jakarta. Survival Analysis is a statistical technique to define the pattern of survivals based on failure times and survival times. Data of survival times is measured from the time customer bought the SIM card until event in which customer stop using it. In his study, characteristic that are both significantly effect to drives rotational customer is age, voucher price and income. Based on the value of its hazard ratio, age 16 until 18 years, income 1.5 until 3 million voucher price under 10 thousand rupies category is an indicator that gives customer the greatest influence in determining the level of one’s impact of rotational prepaid customer.
Keyword: 

Judul: Analisis Faktor-Faktor Yang Dipentingkan Konsumen Dalam Keputusan Pembelian Sim Card Simpati Di Era Mobile Apps (Studi Kasus Mahasiswa Strata 1 Institut Pertanian Bogor)
Abstrak: Telkomsel as the biggest operator cellular in Indonesia with GSM prepaid card Simpati which is the biggest selling product keep trying to be the market leader in this business. Factors are made of factor analysis is four factors have been made as consumers important factor in buting Simpati card. The factors are efficiency and opportunity, communication and motivation, charges and influence of other people and major advantage. In efficiency and opportunity there is an easily in buying voucher, the prices, effective terms and the place. And then in communicationand motivation there is an advertisement, brand name, motivation of buting and information. Meanwhile in charging and influence of of other people there is price, prime card (SMS and phone cell), bonus (SMS and phone cell)and influence of other people. And the last factor is the major advantage, there is high speed internet service and communication.
Keyword: Simpati., major advantage, influence of other people, efficiency, communication

Judul: Natural Pearlescent Pigment Dari Kristal Guanin Sisik Ikan Bandeng (Chanos Chanos)
Abstrak: Pearlescent pigment yang dikenal dengan nama pearl essence atau fish silver merupakan pigmen berwarna keperakan yang memiliki kenampakan seperti mutiara. Natural pearlescent pigment diperoleh dari sisik ikan dengan kandungan guanin 75-97%, dan kini mulai banyak digunakan pada industri personal care dan produk kosmetika. Penelitian ini bertujuan untuk menentukan teknologi ekstraksi natural pearlescent pigment dan karakteristik kualitatif kristal guanin pada sisik ikan bandeng (Chanos chanos). Perlakuan dalam penelitian ini meliputi ekstraksi menggunakan air deionisasi dengan sisik yang dibekukan terlebih dahulu, air deionisasi 10 οC, dimetil sulfoksida 15%, dan 25% (v/v). Hasil spektrum absorbansi UV-Vis menunjukkan kristal guanin merupakan pigmen berwarna putih berdasarkan serapan pada panjang gelombang 200-800 nm. Hasil terbaik diperoleh pada ekstraksi menggunakan air deionisasi dengan sisik beku nilai kristalinitas 68,4%, serapan gugus amina pada 3410 cm-1 dan gugus amida pada1681 cm-1, puncak intensitas 2θ pada sudut 27,7° yang menunjukan identitas dari kristal guanin anhidrat. Tingkat kandungan guanin sebesar 0,0455 ± 0,0033 g (0,46%).
Keyword: Dimetil sulfoksida, guanin, kosmetik, kristalinitas, pearlescent pigment