Judul: Utilization of zeolites and activated carbon in a closed transportation of BEST tilapia fish seed Oreochromis sp. with different salinity.
Abstrak: Ikan Nila BEST Oreochromis sp. merupakan salah satu komoditas penting budi daya perikanan air tawar di Indonesia. Permasalahan yang sering dihadapi oleh petani Indonesia dalam pengiriman benih ikan nila BEST adalah tingkat kelangsungan hidup yang rendah akibat perubahan kualitas air selama transportasi, sehingga diperlukan teknologi transportasi yang mampu mengangkut ikan sebanyak mungkin dengan kematian sedikit mungkin. Salah satu usaha yang dilakukan untuk menetralisir amoniak adalah dengan cara menambahkan zeolit dan karbon aktif di dalam media pengepakan. Transportasi dilakukan selama 24 jam, kemudian ikan dipelihara selama 20 hari. Pengepakan benih ikan nila BEST ukuran 2-3 cm pada kepadatan 700 ekor/L yang ditambahkan 20 g zeolit dan 10 g karbon aktif. Perbedaan perlakuan adalah penambahan dosis garam yaitu 4 g/L, 8 g/L, 12 g/L, dan 20 g/L. Hasil penelitian menunjukan perlakuan penambahan dosis garam 4 g/L lebih efektif dibandingkan perlakuan lainnya dengan nilai kelangsungan hidup sebesar 99,57%. Hal ini juga terlihat pada nilai kualitas air yang lebih baik dibandingkan perlakuan lainnya, TAN 1,70±0,02 mg/L, NH3 0,003±0,000 mg/L, CO2 15,98±0,00 mg/L, suhu 24±0,00 oC, pH 5,4±0,08, DO 3,55±0,35 mg/L, dan kesadahan 115±1,41 mg/L. Nilai kelangsungan hidup pemeliharaan benih pascaperlakuan selama 20 hari adalah 98,14%, lebih tinggi dibandingkan perlakuan lainnya, dengan laju pertambahan bobot harian sebesar 5,06% dan biaya selama transportasi sebesar Rp. 31,199,-.
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Judul: Efektivitas Penambahan Zeolit, Karbon Aktif, dan Minyak Cengkeh dalam Transportasi Tertutup Ikan Nila BEST Oreochromis sp. dengan Kepadatan Tinggi.
Abstrak: Fish transportation was usually held at high density to efficient the transportation cost, but higher density of fish carried inside the container will be increase stress level of fish. Some stress will result in increased activity of fish physycology that could worst the water quality especially DO, CO2, and NH3. An attempt done to neutralize toxic ammonia that is by adding zeolite and active carbon to packing medium, and adding clove oil can condition the fish in a state of calm. Transportation is carried out for 24 hours and 20 days old maintenance with the packing of BEST tilapia fish seed 2-3 cm size with a density 700 fish/ and add the ingredients according to the dosage of 20 g of zeolite, 10 g of activated carbon. Treatment difference is the addition of clove oil dosage is 12 , 24 , 36 , and 48 . The results showed the addition of the treatment dose of clove oil 24 is more effective than other treatments with the SR of 93.36 %. It is also seen on the water quality better than other treatments, TAN 2.73±0.07, NH3 0.0137±0.0004, CO2 39.95±0, temperature 24.75±1.06, pH 6.98±0, and DO 2.20±0. Value of SR seed maintenance post treatment for 20 days was 97.12 %, higher than other treatments, with the rate of daily weight of 8.74 % and the cost for transportation of IDR 47.70, -.
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Judul: Socioeconomic and psychological variables influencing household debt
Abstrak: The overall objective of this study was to examine factors influencing total debt, total debt payment, and patterns of debt payments. The study examined the impacts of both psychological (credit attitudes and perception of future income) and socioe- conomic variables on total debt, total debt payment and patterns of debt payments. A conceptual model for this study was developed by incorporating the theory of borrower risk, the economic and psychological economic theory of borrowing, and the results of previous studies. This model identifies socioeconomic and psycholog- ical variables that influence total debt, total debt payment, and patterns of debt payments. Socioeconomic variables included in the model are gender, race, mari- tal status, employment status, household size, age, education, and household assets. Psychological variables are credit attitudes toward the use of credit, and perception of future income. This study used data from the 1989 Survey of Consumer Finances. The survey was sponsored by the Federal Reserve in cooperation with some other federal agencies. Data for the survey were collected by the Survey Research Center at the University of Michigan between August 1989 and March 1990. dst ...
Keyword: Gender