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Pengaruh Kepadatan Awal Inokulum terhadap Kualitas Kultur Chaetoceros gracilis (Schütt) pada Sistem Batch Gede Suantika; Pingkan Adityawati; Dea Indriani Astuti; Yusup Sofyan
Jurnal Matematika & Sains Vol 14, No 1 (2009)
Publisher : Institut Teknologi Bandung

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Abstract

Chaetoceros gracilis (Schütt) is a common live food used in white shrimp Litopenaeus vanamei larviculture that is commonly produced by using batch culture system. The aim of this study was to evaluate the effect of different initial densities inoculums to obtain the optimum quality of C. gracilis culture in batch culture system. Based on the result from step 1, the highest cell density of 9,85x106 ± 5,00x105 cells/mL was obtained in the culture with inoculum initial density of 1,0x105 cells/mL. At step 2, the highest cell density of 9,87 x 106 ± 2,00 x 105 cells/mL was obtained in the culture with inoculum initial density of 1,0x105 cells/mL and it was significantly (p
Efektivitas Teknik Kultur menggunakan Sistem Kultur Statis, Semi-kontinyu, dan Kontinyu terhadap Produktivitas dan Kualitas Kultur Spirulina sp. Gede Suantika; Deri Hendrawandi
Jurnal Matematika & Sains Vol 14, No 2 (2009)
Publisher : Institut Teknologi Bandung

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Abstract

Cyanobacteria, Spirulina sp., is used in many industries such as aquaculture, medical, and food industry due to its high nutrient level such as protein, fatty acid, vitamin, and antioxidant. In this experiment, three different culture techniques of batch culture, semi-continuous culture, and continuous culture were tested and developed in order to evaluate their effects on Arthrospiras culture production. During 24 days of culture period, batch culture biomass produced was 6.53±0.16 g, semi-continuous culture was 7.51±0.22 g, and continuous culture was 5.42±0.02 g. The highest contaminant presence was obtained in continuous culture, the highest pH level was found in semi-continuous culture. The highest concentration of nitrate, nitrite, ammonium, and orthophosphate was measured in continuous culture. Based on the result, it can be concluded that semi-continuous culture can produce highest biomass for 24 days culture period with a total production of biomass was 7.51±0.22 g and can maintain the stability of water quality.
Perbandingan Hasil Atenuasi Tomografi 3D Menggunakan Metoda Spectral Fitting & Spectral Ratio Dalam Usaha Pemetaan Bawah Permukaan (Studi Kasus Gunung Guntur) Awali Priyono; Gede Suantika; Sri Widiyantoro
Jurnal Matematika & Sains Vol 15, No 3 (2010)
Publisher : Institut Teknologi Bandung

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Abstract

Spectral fitting and spectral ratio methods are tested to estimate the Q value or attenuation in the effort on imaging the subsurface structure using three-dimensional tomographic inversion techniques. In this study, we used microearthquakes data around Mount Guntur that was collected from 1995 until 2007 that consist of 4800 seismograms. Analyses using the spectral fitting and spectral ratio methods generally depict the same anomalous areas. Studies using P and S waves indicate that the area of high attenuation corresponds to the area of low velocity that extending from mount Guntur to Kamojang caldera. In terms of the image quality, it can be seen that the attenuation derived using the spectral ratio of S wave has the same pattern with the one derived using P wave. This is due to the attenuation of S wave, which was derived directly from the P-wave. The Q value in the spectral ratio method depends on the width of the frequency window taken and the effect of noise in the determination the slope of the linear relationship between the natural logarithm of spectral ratio with frequency. The result of the spectral fitting analysis shows that the pattern of S wave attenuation image is different from the pattern inferred from the P wave data, because each attenuation image has been determined separately and does not depend on each other. Since the sensitivity of the values of Qp and Qs are important in fluid rock identification, the determination of Qs should not depend directly on Qp. With the various reasons above and more influential factor in estimating the value of Q using spectral ratio, the spectral fitting method is more recommendable to be employed to determine the value of Q.
SISTEM PAKAR UNTUK BUDIDAYA TAMBAK UDANG PUTIH Ega Dioni Putri; Massayu Leylia Khodra; Gede Suantika
Jurnal Ilmu Komputer dan Informasi Vol 4, No 1 (2011): Jurnal Ilmu Komputer dan Informasi (Journal of Computer Science and Information)
Publisher : Faculty of Computer Science - Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1207.961 KB) | DOI: 10.21609/jiki.v4i1.154

Abstract

Tambak udang putih merupakan sebuah ekosistem buatan kompleks yang membutuhkan bantuan manusia untuk mempertahankan keseimbangan elemen-elemen pembentuknya. Permasalahan di dalamnya disebabkan oleh proses ekologis baik secara biologi, kimia, maupun fisika yang saling terkait. Sehingga untuk menghasilkan solusi optimal perlu diperhitungkan bagaimana keterhubungan antar elemen. Pengetahuan mengenai hubungan elemen-elemen tersebut umumnya dikuasai oleh pakar, tetapi tidak seluruh tambak mampu menyediakan pakar dalam budidayanya. Pengembangan sistem pakar dalam penelitian ini ditujukan untuk menjawab kebutuhan pakar di tambak udang menggunakan teknik klasifikasi. Pengetahuan pakar direpresentasikan dalam decision table dengan penggunaan multi atribut. Hasil eksperimen menunjukkan bahwa sistem mampu menghasilkan solusi dari berbagai variasi masalah yang mungkin terjadi di tambak seperti pakar dan fleksibel untuk dimodifikasi. White shrimp embankment is a complex artificial ecosystem that requires human intervention to maintain the balance of its constituent elements. The problems inside are caused by ecological processes therein, either biology, chemistry, and physics that are interlinked so as to produce the optimal solution needs to be taken into account how the connection between elements. Knowledge about the relationships among these elements is generally dominated by experts, but not all embankments are able to provide experts in the cultivation. Development of expert systems in this study aimed to answer the needs of experts in shrimp embankments using the classification technique. Expert knowledge is represented in a decision table with the use of multi attributes. The experimental results show that the system is capable of generating solutions from a variety of problems that may occur in embankments such as expert and versatile to be modified.
LIMITASI NITRAT UNTUK PERTUMBUHAN DAN AKUMULASI LIPID Chaetoceros calcitrans Rizal Maulana Hasby; Gede Suantika
BIOTIKA Jurnal Ilmiah Biologi Vol 14, No 1 (2016): BIOTIKA JUNI 2016
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bjib.v14i1.14416

Abstract

Mikroalga Chaetoceros calcitrans merupakan pakan alami larvikultur udang. Pertumbuhann dan kandungan lipidnya sangat dipengaruhi oleh faktor lingkungan. Lipidnya tersebut mengandung asam lemak tak jenuh ganda yang tinggi terutama asam eikosapentanoat (EPA, C20:5 n-3) dan asam dokosaheksanoat (DHA, C22:6 n-3). Penelitian ini bertujuan untuk menganalisis pengaruh perbedaan konsentrasi nitrat terhadap pertumbuhan dan kandungan lipid C. calcitans. Berdasarkan hasil penelitian konsentrasi N 50% menghasilkan kandungan lipid ±22% lebih tinggi dari kondisi normal dalam kultur C. calcitrans pada fase akhir stasioner sebesar 10,10%-dw dengan kerapatan sel tertinggi 5 ± 8,72x106 sel/ml, laju pertumbuhan/hari (µ) 0,25, berat kering 0,69 ± 0,09 g-L dan kandungan PUFA (EPA 14,28%, DHA 1,25%). Hal ini menunjukkan bahwa kultur dengan konsentrasi N 50% efektif untuk meningkatkan kandungan lipid serta PUFA C. calcitrans.