Judul: Evaluasi Daerah Penangkapan Ikan Layang (Decapterus spp.) Berdasarkan Indikator Komposisi Hasil Tangkapan, Suhu Permukaan Laut dan Klorofil-a
Abstrak: Determination of accurate fishing ground gives influence on efficiency of fishing operation and productivity. However, fishermen in the northern part of Aceh have difficulties in deciding the position and resulting to the minimum yields. The objective of the research were: (1) to determine the distribution of sea surface temperature (SST), and a-chlorophyll in the north water of Aceh, (2) to determine the composition catch number and size of indian scad (Decapterus spp.) in north water of Aceh, (3) analyzing the relationship between SST and chlorophyll on the catch number and size of indian scad in north water of Aceh, and (4) predicting potential fishing ground in the north water of Aceh. Data were obtained from field data (in-situ) and satellite image data (ex-situ). It was performed by three steps, (1) field surveying in the study location, (2) collecting field data, and (3) downloading SST image and a-chlorophyll from MODIS satellite. Results showed the relationship between SST and chlorophyll is not significant towards catch number and size length of indian scad. Furthermore, SST and chlorophyll are varied in each seasonal period at the range from 27.53oC to 28.83oC and from 0.20 mg/m3 to 0.22 mg/m3. Sizes of fish captured using purse seine are not complying with the current standard and are included under category of restricted to be captured. The most potential fishing ground of indian scad in north water of Aceh during January-March 2012 located Pulo Beras waters.
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Judul: Evaluasi Daerah Penangkapan Ikan Layang (Decapterus spp.) Berdasarkan Indikator Komposisi Hasil Tangkapan, Suhu Permukaan Laut dan Klorofil-a
Abstrak: Determination of accurate fishing ground gives influence on efficiency of fishing operation and productivity. However, fishermen in the northern part of Aceh have difficulties in deciding the position and resulting to the minimum yields. The objective of the research were: (1) to determine the distribution of sea surface temperature (SST), and a-chlorophyll in the north water of Aceh, (2) to determine the composition catch number and size of indian scad (Decapterus spp.) in north water of Aceh, (3) analyzing the relationship between SST and chlorophyll on the catch number and size of indian scad in north water of Aceh, and (4) predicting potential fishing ground in the north water of Aceh. Data were obtained from field data (in-situ) and satellite image data (ex-situ). It was performed by three steps, (1) field surveying in the study location, (2) collecting field data, and (3) downloading SST image and a-chlorophyll from MODIS satellite. Results showed the relationship between SST and chlorophyll is not significant towards catch number and size length of indian scad. Furthermore, SST and chlorophyll are varied in each seasonal period at the range from 27.53oC to 28.83oC and from 0.20 mg/m3 to 0.22 mg/m3. Sizes of fish captured using purse seine are not complying with the current standard and are included under category of restricted to be captured. The most potential fishing ground of indian scad in north water of Aceh during January-March 2012 located Pulo Beras waters.
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Judul: Bifurkasi Hopf pada Model Siklus Bisnis Kaldor Kalecki tanpa dan dengan Waktu Tunda
Abstrak: Business cycle model is one of dynamical system models in economic. One of the business cycles model is Kaldor-Kalecki model. Kaldor-Kalecki business cycle model that is written in delayed defferential equations, is a business cycle model that involves gross product and capital stock of a company. In this paper Kaldor-Kalecki business cycle model is analyzed using both nondelay and delay in time of capital stock. By Taylor expansion for the time delayed model, an analysis of stability around the fixed points has been done. Furthermore, by using Hopf bifurcation theorem, it can be shown that there exists periodic orbits and limit cycle. In the nondelayed model, changing the parameter of goods market could lead to the occurrence of Hopf bifurcation and the existence of limit cycle. Similarly, for the delayed model, it has been shown that changing the time delay parameter may result in the occurrence of Hopf bifurcation and limit cycle.
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