Judul: Alat Pendingin Ikan Portabel Menggunakan Energi Listrik Tenaga Surya.
Abstrak: Indonesia is a maritime country, with a vast sea area, producing huge number of fish as the biggest sea commodity. The utilization of marine products, particularly fish, can be optimized with a good handling process. Catched fish should be stored at temperature 0ºC-5ºC to maintain its freshness. Unfortunately, many Indonesian fishermen are still using conventional methods to deal with the haul. For instance, a lot of ice are used to maintain the temperature and the addition of salt to prevent rotten fish. However, those methods will result in changes of quality and taste of the fish. Author created a model of portable solar-powered fish-chiller instrument. Solar power was selected as the alternative source of electric energy for this instrument, considering the fact that sunlight is the best resource which can be utilized when fishermen sail. The design of this instrument is divided into 3 parts: chiller design, energy source and energy source connector. The capacity is 40 liter with dimension : 80 cm of length, 70 cm of width and 90 cm of height. According to the trial, this instrument is able to generate a minimum temperature of -13.5º C and maximum temperature of -0.9º C in 90 minute. Based on the data obtained, this instrument can be used as the fish chiller to maintain the freshness of the fish.
Keyword: the temperature., the fishermen, the freshness of the fish, solar panels, Instrument cooling

Judul: Refrigerated Portable Refrigerated Fish Storage for Small Scale Fisheries
Abstrak: Metode penyimpanan ikan dengan suhu rendah merupakan salah satu proses penanganan yang sangat dibutuhkan untuk menjaga kualitas ikan pasca penangkapan. Penggunaan es sebagai media penyimpanan juga ternyata hanya dapat bertahan dalam waktu yang singkat serta seringkali memberikan kerusakan fisik pada ikan. Hal tersebut memunculkan ide untuk dapat membuat alternatif penyimpanan ikan berpendingin di atas kapal sebagai solusi dari masalah tersebut. Tujuan dari penelitian ini adalah: (1) membuat rancangan portable mini fish box; (2) mengetahui kebutuhan daya dan performa portable mini fish box; (3) mengetahui efisiensi biaya dalam pengoperasian portable mini fish box. Hasil penelitian ini menunjukkan bahwa Mini Fish Box dapat dibangun dengan menggunakan sistem refrigerasi dengan dimensi 65x66x50 cm. Besar daya yang dibutuhkan portable mini fish box secara berturut-turut untuk kondisi tanpa beban dan beban 4 kg adalah 374,94 watt dan 651,93 watt dengan waktu yang dibutuhkan untuk mencapai suhu 5 oC adalah 34 menit pada kondisi berawan tanpa beban dengan suhu lingkugan berkisar 23-30 oC dan waktu terlama adalah 76 menit dengan kondisi terik berbeban pendinginan 4 kg dengan suhu lingkungan berada pada antara 30–36 oC. Portable mini fish box juga secara efektif dapat menghemat 90% dari biaya pendingin konvensional dengan biaya perkg ikan yang dikeluarkan hanya sebesar Rp127/kg hasil tangkapan., The method of storing fish at low temperatures is one of the handling processes that is needed to maintain the quality of fish after capture process. The use of ice as a storage medium also turns out only works in short time and often causes physical damage to fish. This gave rise to the idea of creating an alternative to refrigerated fish storage on board as a solution to this problem. The objectives of this research are: (1) to design a portable refrigerated fish storage; (2) determine the power and performance requirements of a refrigerated portable storage; (3) find out the cost efficiency in operating a refrigerated portable storage compare to traditional fish storage. The results of this study indicate that a portable storage can be built using a refrigeration system with dimensions of 65x66x50cm. The power requirements required for a refrigerated portable storage respectively for no-load and 4 kg load conditions are 374.94 watt and 651.93 watt with the time needed to reach 5 oC temperature is 34 minutes in cloudy conditions without load and the longest time is 76 minutes in hot conditions. 4 kg cooling load. The refrigerated portable storage can also effectively save 90% of the cost of conventional coolers with a per kg fish cost of only Rp127 per kg of catch.
Keyword: efisiensi biaya, kesegaran ikan, portable mini fish box, cost efficiency, fish quality

Judul: Quantitative Trait Loci Mapping for Trait in Categorical Scale
Abstrak: Genes or regions on chromosome underlying a quantitative trait are called Quantitative Trait Loci (QTL). Characterizing genes controlling quantitative trait on their position in chromosome and their effect on trait is through a process called QTL mapping. In estimating the QTL position and its effect, QTL mapping basically utilize the association between QTL and DNA markers. However, many important traits are obtained in categorical scale, such as resistance from certain disease. From a theoretical point of view, QTL mapping method assuming continuous trait could not be applied to categorical trait. This research was focusing on the assessment of the performance of Maximum Likelihood (ML) and Regression (REG) approach employed in QTL mapping as well as the performance of Lander and Botstein (LB) and Piepho method in determining critical value in testing the existence of QTL for binary and ordinal trait by means of simulation study. The simulation study to evaluate the performance of ML and REG approach was conducted by taking into account several factors that may affecting the performance of both approaches. The factors are: (1) marker density; (2) QTL effect; (3) sample size; (4) shape of phenotypic distribution; (5) number of categories; and (6) number of QTL. Moreover, the simulation study for evaluating LB and Piepho method in determining critical value was conducted by generating distribution of the test statistic under null hypothesis. From simulation study, it was obtained that LB and Piepho method showing similar performance in determining critical value in testing the existence of QTL for binary and ordinal trait. The simulation study also indicating that both methods could be used in determining critical value in QTL mapping analysis for binary trait as well as for ordinal trait if the REG approach is used but not if ML approach is used due to their poor performance. In assessing the performance of ML and REG approach in QTL mapping analysis for binary trait, the two approaches showing comparable performance; whereas for ordinal trait REG approach showing poor performance compared with ML approach in estimating thresholds. As a result, in QTL mapping analysis, ML and REG approach could be used when dealing with binary trait, whereas ML approach is suggested when dealing with ordinal trait.
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