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Fiametta Ayu Purwandari
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Faculty of Agricultural Technology, Universitas Gadjah Mada, Jl. Flora No. 1, Bulaksumur, Yogyakarta 55281, Indonesia
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agriTECH
Published by Universitas Gadjah Mada
ISSN : 02160455     EISSN : 25273825     DOI : 10.22146/agritech
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
Agritech with registered number ISSN 0216-0455 (print) and ISSN 2527-3825 (online) is a scientific journal that publishes the results of research in the field of food and agricultural product technology, agricultural and bio-system engineering, and agroindustrial technology. This journal is published by Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta in colaboration with Indonesian Association of Food Technologies (PATPI).
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Pertanian dan Biologi (Lain-Lain)
Articles 1,392 Documents
 86   87   88   89   90 
Simulasi Pemerkiraan Parameter Sifat Fisikawi Bahan Makanan dengan Metode Penjejak Parameter B. Rahardjo
agriTECH Vol 14, No 2 (1994)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2362.141 KB) | DOI: 10.22146/agritech.19279

Abstract

Simulation of the parameter tracking method was used to estimate the physical parameters of food material. The input-output relationships of the materials were based on known mathematical models. Three mathematical models of the food properties were studied: the Kelvin model of linear viscoetastic material, the power law of non Newtonain liquid, and the impact model of a non linear viscoelastic spherical object. The results indicated that the parameter tracking method can determine the parameters of the models correctly. However the speed of the estimation depends on the models. The estimation of the parameters of the linear model converged Faster than that of non linear models.
Pengukuran Kecepatan Aliran Bermuatan Sedimen di Saluran Irigasi Saiful Rochdyanto
agriTECH Vol 14, No 2 (1994)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2380.737 KB) | DOI: 10.22146/agritech.19280

Abstract

Study on the measurement of flow velocity in sediment-laden flow was carried out in Van Der Wig* irrigation Canal, Yogyakarta. Study was conducted in various of canal conditions and various of sediment concentration. Flow velocity was measured by using current meter and water sample was collected by using suspended sampler. Result of study shows that velocity distribution data can be suited by the power-law, although it does not seem to fit with equation that presented by Munson which is suitable with non-sediment laden flow in open channels. Due to the deviation on power-law graph, in order to find the average-measured-velocity which is match with the actual-velocity, the point of measurement should be 0,71 D (from the free water surface). The point of measurement at 0,6 J) such as already established by regulation will give an error about 14,35%.
Koefisien Laju Penurunan Debit Aliran Dasar Sebagai Indikator Perubahan Sistem Transfer Hujan-Aliran Suatu DAS : Studi Kasus DAS Naizin Perancis Sunarto Goenadi
agriTECH Vol 14, No 2 (1994)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2097.554 KB) | DOI: 10.22146/agritech.19282

Abstract

The transfer of rainfall-discharge in a watershed is one of an important role in hydrological cycles. The changes of the watershed physical conditions affect significantly to that bluffer. This study focused to describe the effect of agricultural land consolidation and different area of maize on coefficient of base now recession. The experimental of the Naizin, which has an area of 1193 hectares located in France was used for the study. The result showed that the land consolidation and different area of maize cultivation affect significantly to the coefficient of base flow recession.
Hubungan Keadaan Kimiawi dan Mikrobiologik Bandeng Asap Pada Penyimpanan Suhu Kamar dengan Sifat Organoleptiknya Suwedo Hadiwiyoto
agriTECH Vol 14, No 2 (1994)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1218.665 KB) | DOI: 10.22146/agritech.19283

Abstract

Perubahan kimiawi dan keadaan mikrobiologik bandeng asap telah diamati selama penyimpanan pada suhu kamar. Bandeng asap dibuat dengan cara pengasapan panas (suhu ± 70°C) selama 3 - 4 jam dengan bahan serbuk gergaji kayu jati. Pengamatan keadaan kimiawi meliputi kandungan ammonia, kerusakan lemak, dan keadaan asamnya. Diperoleh keterangan, pengasapan dapat menaikkan kandungan ammonia dan total asam, tetapi menurunkan nilai TBA-nya. Setelah bandeng asap disimpan pada suhu kamar, kandungan ammonia dan nilai TBA-nya meningkal terus masing-masing mencapai 40% dan 160% pada penyimpanan empat hari. Total asam mula-mula menurun kemudian meningkat selama penyimpanan. Pengasapan juga menurunkan jumlah bakteri lebih daripada 93%. tetapi pertumbuhan bakteri meningkat selama penyimpanan. Jamur dapat mulai tumbuh setelah penyimpanan dua hari, sedangkan pada hari ketiga penyimpanan bandeng asap, pertumbuhan jamur menjadi nyata terlihat. Penyimpanan dua hari hampir tidak merubah penerimaan (kesukaan) panelis terhadap bau dan kenampakan bandeng asap, pada saat kandungan ammonia dan nilai TBA-nya masing-masing baru mencapai 30 mg/kg dan 620 mg/kg. Bau dan kenampakan bandeng asap tidak lagi disukai panelis setelah penyimpanan berlangsung 4 hari, pada saat kandungan ammonia mencapai 39 mg/kg dan nilai TBA mencapai 680 mg/kg ikon asap.
Pengaruh Iradiasi Terhadap Enzim Buah Pisang (Musa paradisiaca) Aryanti Aryanti; Ermin Winarno; Nurhidayati Nurhidayati; R. Sinaga
agriTECH Vol 14, No 2 (1994)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1263.72 KB) | DOI: 10.22146/agritech.19284

Abstract

The purpose of this study was to investigate the effect of irradition on the activity of pectinesterase, peroxisidase, polyphenol oxidase enzymes and their isoenzymes respectively. Bananas were irradiated at the doses of 0; 0,15; 0,3 and 0,45 kGy.and stored at 22°C and RH 70 - 80%. The results showed that irradition at the dosis of 0,15; 0,3 and 0,45 kGy could reduce pectinesterase activity by 4.52; 16.96 and 18.57% respectively. The activity of peroxidase were reduce by irradiation at the doses of 0,3 and 0,45 kGy by 16.37 and 21.81% and polyphenoloxidase were 19.67 and 24,52% lower than the control. The intensity of irradiated samples were lower than those of control. Irradiation doses of 0,3 kGy could be used to prolong the shelf-life of bananas up to three weeks; the firmness, L, a and b values of this irradiation level were higher than those of the control, and those of the irradiated at the doses of 0.15 and 0.45 kGy up to two weeks.
Peranan Teknologi Konstruksi dalam Menunjang Pelaksanaan Operasi dan Pemeliharaan yang Berkelanjutan Suprodjo Pusposutardjo
agriTECH Vol 14, No 3 (1994)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1722.157 KB) | DOI: 10.22146/agritech.19285

Abstract

Insufficient involvement of O&M staffs' the design and construction stages, and the designers are not sufficiently alert to the requirement of O&M, indicate that the principle of water resources development as a unit system of operation and maintenance focussing on management have not been adopted in Indonesia. This condition causes weak linkage between construction and O&M, as indicated by unsuited structures to the local O&M capability. Low reliability of topographic map, complicated structural network, and insufficient data information on physical environment are also strongly influence on the unsuited structures to the O&M practice. Attempting to eliminate the problem, it is suggested that the adopted technology of construction has to be more flexible to accomodate the specific site requirements. As the complement of this effort the current administrative procedure of project implementation has to be revised in some ways so that the technology of construction transferable to O&M. By adopting this procedure of project implementation, technology of construction will have significant contribution in attaining sustainable O&M.
Evaluasi Penggunaan Emulsi Lilin Pada Pemasaran Buah Mangga Arumanis Yuniarti Yuniarti; Suhardjo Suhardjo; A. Suryadi; Bonimin Bonimin
agriTECH Vol 14, No 3 (1994)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1293.981 KB) | DOI: 10.22146/agritech.19286

Abstract

Objective of this research was to know local and export consumer acceptability towards the use of 6% wax emulsion on mango arumanis cv. Fruits were harvested from Keaton experimental station, Pasuruan in October 1992. For local market, 30 bamboo baskets, each consisted of 15 kg of arumanis mango, 15 baskets were treated with wax emulsion and 15 baskets left no treated transported as far as ± 1000 km and observed at fruit markets. For export market, 30 carton box each consisted of 5 - 6 kg mango arumanis cv., 15 box were treated with wax emulsion and 15 box left no treated, exported to Singapore through Cirebon harbour and observed after they were arrived in Singapore. Obsersvation had been done on consumer acceptability, percent of damage, fruit condition, weight loss, stage of maturity and economical analysis. The results showed that for marketing that needed long time (± 134 hours), treatment of 6% wax emulsion could be accepted by the consumer, and price accepted by the retailer 0,9% higher each kg, compared to untreated.
Penyimpanan Buah Rambutan dalam Atmosfir Termodifikasi Suhardi Suhardi
agriTECH Vol 14, No 3 (1994)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1115.433 KB) | DOI: 10.22146/agritech.19288

Abstract

Penelitian tentang penyimpanan buah rambutan segar dalam Iingkungan udara termodifikasi dimaksudkan untuk memperpanjang umur simpan yang sudah diketahui berhasil untuk berbagai macam buah. Penyimpanan dengan atmosfir termodifikasi yang digunakan campuran gas CO2 4%, 02 4 - 8%, N2 88 - 92%; dengan suhu 10 - 15°C. Parameter yang digunakan untuk mengetahui keberhasilan penyimpanan sifat-sifat fisik dan kimia yang dianalisis sampai buah memberikan tanda-tanda rusak. Hasil penelitian menunjukkan bahwa kerusakan buah diikuti dengan penurunan kadar gula, vitamin C, tekstur dan sebaliknya terjadi peningkatan asam dan timbulnya warna coklat pada kulit dan rambut serta berbau tidak sedap. Penyimpanan buah rambutan dengan menggunakan campuran gas CO2 4%, 02 6%, dan N2 90%, pada suhu 15°C memberikan hasil yang terbaik yaitu sampai hari ke-16 buah masih tetap segar, sedang yang disimpan dalam atmosfir terbuka sudah rusak pada hari ke-4.
Hubungan Keadaan Kimiawi dan Mikrobiologik Bandeng Asap Pada Penyimpanan Suhu Kamar dengan Sifat Organoleptiknya Suwedo Hadiwiyoto
agriTECH Vol 14, No 3 (1994)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1595.785 KB) | DOI: 10.22146/agritech.19289

Abstract

Perubahan kimiawi dan keadaan mikrobiologik bandeng asap telah diamati selama penyimpanan pada suhu kamar. Bandeng asap dibuat dengan cara pengasapan panas (suhu ± 70°C) selama 3 - 4 jam dengan baban bakar serbuk gergaji kayu jati. Pengamatan keadaan kimiawi meliputi kandungan ammonia, kerusakan lemak, dan keadaan asamnya. Diperoleh keterangan, pengasapan dapat menaikkan kandungan ammonia dan total asam, tetapi menurunkan nilai TBA-nya. Namun setelah bandeng asap disimpan pada suhu kamar, kandungan ammonia dan nilai TBA-nya meningkat terus masing-masing mencapai 40% dim 160% pada penyimpanan empat hari. Total asam mula-mula menurun kemudian meningkat selama penyimpanan. Pengasapan juga menurunkan jumlah bolded lebih daripada 93%, tetapi pertumbuhan bakteri meningkat selama penyimpanan. Jamur dapat mulai tumbuh setelah penyimpanan dua hari, sedangkan pada bari ketiga penyimpanan bandeng asap pertumbuhan jamur menjadi nyata terlihat. Penyimpanan dua harti hampir tidak merubah penerimann (kesukaan) panelis terhadap bau dan kenampakan bandeng asap, pada saat kandungan ammonia dan nilai TBA-nya masing-masing baru mencapai 30 mg/kg dan 620 mg/kg. Bau dan kenampakan bandeng asap tidak lagi disukai panelis setelah penyimpanan berlangsung 4 hari, pada saat kandungan ammonia mencapai 39 mg/kg dan nitai TBA mencapai 680 mg/kg ikan asap.
Pemerkiraan Parameter Tumbukan Model Viskoelastik Tak Linier Berbentuk Bola dengan Menggunakan Metode Pelacak Parameter Budi Rahardjo
agriTECH Vol 14, No 3 (1994)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1629.939 KB) | DOI: 10.22146/agritech.19291

Abstract

The parameter tracking method was used to estimate the parameters of non linear viscoelastic spherical model during impact. A set of impact data of free Falling indoor lacrose ball used to estimate the parameters of the model. The results indicated that the three parameters of the Impact can be determined by the method appropriately. The impact parameters of non linear viscoelastic spherical object can be estimated with a single set of impact data.

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