Judul: Packaging of Pineapple Seeds (Ananas comosus (L) Merr.) Result of Tissue Culture to Maintain Quality during the Transportation Period
Abstrak: Kendala dari pendistribusian bibit nanas ke berbagai daerah di Indonesia adalah jarak yang cukup jauh dan banyak wilayah Indonesia yang terdiri dari pulau-pulau. Transportasi bibit jarak jauh idealnya memerlukan teknik pengemasan yang dapat menjaga mutu bibit, praktis, ringan, dan ekonomis. Penelitian ini bertujuan mempelajari teknologi pengemasan bibit Nanas (Ananas comosus (L.) Merr.) hasil kultur jaringan untuk mempertahankan mutu selama periode transportasi. Penelitian disusun menggunakan Rancangan Kelompok Lengkap Teracak (RKLT) dengan dua faktor, yaitu jenis media dan kemasan. Faktor pertama adalah jenis media dengan taraf perlakuan tanpa cocopeat, cocopeat 50 g + 100 ml air + fungisida Mankozeb 80%, cocopeat 100 g + 200 ml air + fungisida Mankozeb 80%, sedangkan faktor kedua adalah kemasan dengan taraf perlakuan strimin rangkap satu, strimin rangkap dua, dan strimin rangkap tiga. Periode transportasi dilakukan sebanyak dua kali (pulang-pergi) dengan rute Bogor-Solo-Bogor selama 252 jam 33 menit dengan 135 jam 20 menit dalam kendaraan menggunakan jasa ekspedisi (non stasioner) dan 117 jam 11 menit dalam ruangan (stasioner). Pengemasan bibit nanas menggunakan strimin, media cocopeat, maupun tanpa cocopeat mampu mempertahankan mutu bibit selama proses transportasi. Semua perlakuan mampu mempertahankan bobot bibit dengan baik dengan nilai persentase susut bobot bibit perkemasan yang rendah. Dalam aplikasinya, pengiriman tanpa cocopeat merupakan metode terbaik dalam segi efisiensi pengiriman karena memiliki total bobot perkemasan lebih rendah dibandingkan kemasan dengan cocopeat 50 g dan 100 g. Semua perlakuan tidak berpengaruh terhadap penurunan kandungan klorofil daun. Kombinasi cocopeat 50 g dan 2 lapis strimin merupakan perlakuan terbaik untuk produsen bibit dan petani karena dapat mempertahankan mutu bibit nanas dalam meminimalisir kerusakan selama transportasi, mempertahankan kesegaran bibit selama proses pemulihan pada minggu ketiga, serta kecepatan tumbuh bibit nanas., The problem with the distribution of pineapple seedlings to various regions in Indonesia is that it is quite a long distance and many parts of Indonesia consist of islands. Ideally, long-distance seedlings transportation requires a packaging techniques which can maintain the quality of seedling, practical, lightweight and economical. This research aims to study the packaging technology of the tissue cultured pineapple (Ananas comosus (L.) Merr.) Seedlings to maintain quality during transportation period. This research was arranged in a Randomized Complete Block Design (RCBD), with two factors, which are the type of media and packaging. The first factor is media i.e.: without cocopeat, cocopeat 50 g + 100 ml water + Mankozeb fungicide 80%, cocopeat 100 g + 200 ml water + Mankozeb fungicide 80%, while the second factor is packaging technique, i.e.: single strimin, double strimin, and triple strimin. Transportation was carried out twice (round trip) through Bogor-Solo-Bogor route in 252 hours 33 minutes with 135 hours 20 minutes in transportation (non stationary) and 117 hours 11 minutes days in the room (stationary). The packaging of pineapple seedlings with strimin, cocopeat media, or without cocopeat can maintain the quality of the seedlings during the transportation period. All treatments can maintain the weight of the seedlings properly with low persentage of weight loss. In its application, transportation without cocopeat is the best treatment for its shipping efficiency due to having a lower total package weight compared to packages with
Keyword: Cocopeat, fungisida, klorofil, strimin, vigor

Judul: Effect of Cold Storage Using Controlled  Atmosphere Storage on Pineapple Fruit Quality.
Abstrak: Buah nanas merupakan salah satu buah unggulan di Indonesia. Indonesia merupakan salah satu produsen nanas segar terbesar di Asia Tenggara. Besarnya produksi buah nanas di Indonesia tidak seimbang dengan volume ekspor yang masih tergolong rendah. Buah nanas di Indonesia sebagian besar di ekspor dalam bentuk olahan dikarenakan umur simpan buah nanas yang tergolong pendek.Salah satu cara untuk memperpanjang umur simpan buah nanas adalah dengan penyimpanan menggunakan suhu dingin yang dikombinasikan dengan pengaturan komposisi udara. Penyimpanan jenis ini biasa disebut controlled atmosphere storage (CAS). Tujuan penelitian ini adalah menganalisis pengaruh metode penyimpanan CAS terhadap mutu buah nanas segar selama penyimpanan dingin. Buah nanas akan disimpan dengan 3 jenis penyimpanan, yaitu penyimpanan menggunakan suhu lingkungan (T 29°C), penyimpanan menggunakan suhu dingin (T 10°C), dan penyimpanan menggunakan metode CAS (T 10°C, O2 5-7%, CO2 < 5%, RH 85-90%). Buah nanas disimpan menggunakan 4 jenis lama penyimpanan, yaitu 7 hari, 14 hari, 21 hari, dan 28 hari. Mutu yang diukur adalah susut bobot, kekerasan, total padatan terlarut, total asam tertitrasi, dan warna daging buah. Rancangan percobaan yang digunakan adalah rancangan acak kelompok 2 faktorial. Hasil dari penelitian menunjukkan susut bobot terkecil terdapat pada jenis penyimpanan CAS yaitu 2,24%. Tingkat kekerasan tertinggi juga terdapat pada metode CAS sebesar 28,12 N. Metode penyimpanan CAS tidak berpengaruh terhadap nilai total padatan terlarut dan total asam tertitrasi. Nilai warna L, a, dan b cenderung dipengaruhi oleh lama penyimpanan. Semakin lama waktu penyimpanan akan menunjukkan tingkat warna kematangan buah nanas. Berdasarkan nilai susut bobot dan kekerasan, penyimpanan menggunakan CAS adalah jenis penyimpanan terbaik, Pineapple is one of the leading fruits in Indonesia. Indonesia is one of the largest fresh pineapple producers in Southeast Asia. The amount of pineapple production in Indonesia is not balanced with the export volume which is still relatively low. Pineapple fruit in Indonesia is mostly exported in processed form due to the short shelf life of pineapple. One way to extend the shelf life of pineapple is to store it using cold temperatures combined with air composition settings. This type of storage is known as controlled atmosphere storage (CAS). The purpose of this study was to analyze the effect of the CAS storage method on the quality of fresh pineapple during cold storage. Pineapple fruit will be stored in 3 types of storage, namely storage using ambient temperature (T 29°C), storage using cold temperature (T 10°C), and storage using the CAS method (T 10°C, O2 5-7%, CO2 < 5%, RH 85-90%). Pineapple fruit is stored using 4 types of storage duration, namely 7 days, 14 days, 21 days, and 28 days. Quality measured was weight loss, hardness, total dissolved solids, total acid titrated, and flesh color. The experimental design used was a 2-factorial randomized block design. The results of the study showed that the smallest weight loss was found in the CAS storage type, which was 2.24%. The highest hardness level was also found in the CAS method of 28.12 N. The CAS storage method had no effect on the value of total dissolved solids and total titrated acid. The color values of L, a, and b
Keyword: controlled atmosphere storage, mutu, nanas, suhu dingin

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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