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: Design of Environmentally Friendly Cold Storage
Abstrak: Sebagai negara maritim, Indonesia memiliki keanekaragaman sumber daya lautan yang sangat berlimpah. Hal ini membuat banyak dari masyarakat Indonesia yang memiliki profesi sebagai nelayan. Namun sama halnya dengan produk pertanian, produk hasil sumber daya laut seperti ikan merupakan produk yang mudah rusak dan perlu perhatian khusus dalam penanganannya agar tidak menurunkan harga jual produk tersebut. Hal ini kemudian memaksa nelayan untuk menerapkan sistem one day fishing untuk melaut dan mencari ikan karena keterbatasan fasilitas penyimpanan ikan yang baik. Tujuan dari penelitian ini adalah merancang cold storage dengan sistem refrigerasi kompresi uap ramah lingkungan dengan penggunaan refrigeran R32 serta sumber energi alternatif dari photovoltaic. Cold storage dirancang memiliki kapasitas 500 kg dan dirancang dapat dipasang pada kapal nelayan sehingga memberi kesempatan waktu lebih lama nelayan untuk melaut. Hasil pengujian kinerja cold storage tanpa beban produk dilakukan dengan melakukan variasi mass charge refrigeran, tekanan evaporasi, beban aktual, serta analisa emisi dengan LCCP dan diperoleh mesin memiliki performansi terbaik dengan mass charge 190 gram pada tekanan 1,3 bar gauge dengan suhu capaian -18℃. Secara berturut-turut cold storage memiliki nilai kapasitas pendinginan, konsumsi daya listrik, serta COP tertinggi sebesar 3,37 kW, 0,68 kW, dan 5,54. Emisi yang dengan penggunaan photovoltaic dihasilkan dari cold storage ini adalah 2148,8 kg CO2e per tahunnya., As maritime country, Indonesia has a very abundant diversity of marine resources. This makes many Indonesian people have professions as fishermen. However, just like agricultural products, marine products such as fish are products that are easily perishable and require special attention in handling to keep the quality as good as possible. This then forces fishermen to do one day fishing system to go to sea and do fishing due to limited proper storage facility. The aims of this research were to design an environmentally friendly cold storage using vapor compressed refrigeration cycle with R32 refrigerant and alternatif energi resource from photovoltaic. This cold storage designed to have a capacity of 500 kg and possible to be installed on fishing boats. Cold storage was tested without cooling load product with variation of mass charges, evaporation pressure, actual load, anda emission analysis using LCCP method and it was found that the cold storage had the best performance with mass charge of 190 gram at evaporation pressure at 1,3 bar gauge with reachable temperature of -18℃. Respectively, cold storage had the highest cooling capacity, energi consumption, and COP values of 3,37 kW, 0,68 kW, and 5,54. The emissions produced by the use of this cold storage using photovoltaic system is 2148,8 kg CO2e per year.
Keyword: Cold storage, One day fishing, Photovoltaic, Refrigerant R32, Vapor compression refrigeration cycle

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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