Judul: Perbaikan proses pemasakan teh dan uji mutu tutup botol (Crown cork) di PT> Sinar Sosro, Jakarta
Abstrak: Kepercayaan konsumen terhadap P.T. Sinar Sosro sebagai produsen teh botol yang ditandai dengan meningkatnya permintaan teh botol Sosro (TBS) dapat dipertahankan apabila P.T. Sinar Sosro mampu melayani permintaan konsumen akan teh botol Sosro dari segi jumlah maupun mutu. Terlepas dari hal ini, kemampuan yang ada belum memungkinkan P.T. Sinar Sosro menyediakan produk dalam jumlah lebih banyak pada tahun 1997 bahkan diperkirakan sebaliknya. Perhatian terhadap mutu perlu diperluas sampai tahap distribusi dan pemasaran. Tujuan kegiatan ini adalah mengupayakan beberapa perbaikan untuk optimalisasi proses dan jaminan mutu sehingga dapat memberikan produk yang lebih baik kepada konsumen. Perbaikan proses dilakukan pada tahap pemasakan teh. Kegiatan yang dilakukan meliputi penentuan waktu ekstraksi teh untuk mendapatkan warna seduhan sesuai standar, penentuan volume suspensi yang terpakai untuk dosing (penambahan kieselguhr selama penapisan). penentuan jumlah kieselguhr (bahan pembantu penapisan), penentuan outpul untuk 1 kali cuci cosmos (alat penapis tekanan menggunakan pompa), penentuan efisiensi kieselguhr untuk 1 kali cuci cosmos can perancangan alat pengoperasian kieselguhr dosing lini 3. Uji mutu tutup botol yang dilakukan adalah uji ketahanan warna tutup botol, uji ketahanan karat tutup botol sebagai bahan baku dan uji ketahanan karat tutup botol sebagai produk TBS. Ekstraksi teh dilakukan di tangki tertutup dengan cara menyirkulasi air panas menggunakan pompa. Seduhan teh dengan warna A. A, B, B dan B pada kondisi ekstraksi normal (suhu 98°C, air 6750 liter, teh kering 42,5 kg dan sirkulasi tambahan 35 menit) membutuhkan waktu ekstraksi berturut-turut 45, 51, 56,63 dan 71 menit. Data ini menunjukkan seduhan teh dengan warna yang semakin gelap membutuhkan waktu ekstraksi yang semakin lama. Kadar dosing lini 2 maupun lini 3 sangat bervariasi yaitu 2,3 8,6 kg kieselguhr/1000 I suspensi untuk lini 2 dan 2.69.6 kg kieselguhr/1000 1 suspensi untuk lini 3. Hal ini disebabkan oleh penambahan kieselguhr dan teh cair pahit (TCP) dengan cara dikira-kira pada setiap pembuatan suspensi sehingga perbandingannya terkadang berubah. Kadar dosing yang bervariasi bisa menjadi penyebab cosmos cepat mampet. Kadar dosing, kieselguhr untuk dosing dan efisiensi kieselguhr untuk 1 kali cuci cosmos pada kedua lini hampir sama. Kieselguhr untuk precoating lini 2 lebih banyak daripada lini 3. dimana lini 2 (1.4 kg/m²) termasuk pemakaian boros sedangkan lini 3 (0.7 kg/m) termasuk pemakaian dalam selang yang dianjurkan....
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Judul: Kajian Peluang Aplikasi Produksi Bersih Untuk Meningkatkan Efisiensi Produksi Teh Botol Sosro (Studi Kasus di PT. Sinar Sosro KPB Cibitung)
Abstrak: Teh Botol Sosro (TBS) is one of the main products of tea processing in PT Sinar Sosro KPB Cibitung. The total production efficiency was influenced by efficiency in the water treatment process unit, extraction process unit, mixing process unit, and bottling process unit. TBS production efficiency in 2011 was 58.24% with total production of 228 129 672 bottles. The efficiency continuously decreased in 2012 and 2013 at 57.08% and 56.35% with total production of TBS 271 265 184 bottles and 246 664 944 bottles, respectively. The decrease of production efficiency was affected by machines performance. The purpose of this study was to analyse the opportunity for cleaner production implementation and to formulate its alternative strategy for improving the efficiency of TBS production process. The methods used in this study were quick scan on the production process of TBS, and implementation feasibility assessment. The result from quick scan showed that inefficiency of TBS production occured in some unit processes, namely water treatment process unit, extraction process unit, mixing process unit, and bottling process unit. The inefficiency of production with respect to the highest breakdown time were the bottle washing process unit and fillercrowner process unit. Alternative strategies of cleaner production recommended are implementation of good operating practices, the use of control level sensors for the extraction tank and mixing tank, good maintenance of bottle washer units and liquid sweet tea (TCM) filling units of as a preventive action. Result of the feasibility assessment and the highest frequency (modus) of breakdown time, it is recommended the priority for implementation of cleaner production in the the bottle washing machine maintenance system.
Keyword: Bogor Agricultural University (IPB), feasibility assessment., cleaner production, TBS production line, Efficiency

Judul: Dinamika populasi manusia dan vektor pada penularan penyakit malaria oleh plasmodium falciparum dan plasmodium vivax
Abstrak: Malaria is a disease that transmitted to human by the bitting of infectious Anopheles mosquitoes. This infectious desease caused by parasite genus Plasmodium. There are two species of the parasites studied here, that cause human malaria namely Plasmodium vivax and Plasmodium falciparum. The mathematical model in discribing the transmission of Plasmodium falciparum and Plasmodium vivax on human population is divided into four classes, the susceptible, the infectious, the dormant, and the recovered classes. Mosquitoes that caused malaria are called the vector. In this case, the vector population is divided into two classes, the susceptible and infectious classes. There are two equilibrium states, a disease free state E0 and an endemic state E1. The stability of E0 and E1 is determined by considering the basic reproductive number (R0). The E0 is stable if R0 is less than one. On the other hand, the point E1 was stable given the value of R0 is greater than one. In this research the dynamic of human population and vector is discribed in to some ilustrative sample with 5% and 50% of the infected vector. It is found that, if R0 < 1, with 5% infected vector could reach the stability faster than the 50% infected vector. For R0 > 1 , it was found that, 5% infected vector could reach the stability slower than the 50% infected vector. This research also showed that the interaction between susceptibles and infectious human has no effect in to the dynamic of the human population.
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