Yohanes Aris Purwanto
Department of Machinery and Biosystem, Institut Pertanian Bogor, Bogor 16002, Indonesia

Published : 23 Documents
Articles

Found 23 Documents
Search

Evaluasi Kinerja Tarik Taktor Tangan Dengan Bahan Bakar Minyak Kelapa Murni ., Desrial; Purwanto, Yohanes Aris; Wiratama, Fandra
Jurnal Keteknikan Pertanian Vol 24, No 1 (2010): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Abstract Past research shown that coconut oil can be used directly in Diesel engine by adding a heating element in the fuel delivery system. This study aims to evaluate the performance of a hand tractor pull using pure coconut oil fuel. The Diesel engine of the tractor was equipped with a fuel heater installed on the mufler. Traction performance parameters tested were wheel slippage, drawbar pull, forward speed and drawbar power on the path of concrete and soil. Besides, the tractor was also tested on plowing using a moldboard plow. The test results on the concrete track showed that the maximum drawbar pull was 1.21 kN generated at a speed of 0.92 m/s, with a maximum drawbar power of 1.21 kW at the wheel slip of 10.87%. While the drawbar pull on the soil track was 1.37 kN at a speed of 0.79 m/s, with a maximum value of 0.71 kW drawbar power when wheels slip 22.25%. The results of tillage test showed that field efficiency was 84.66%, which was not much different from the test result using Diesel fuel. Keywords: fuel heater, Diesel engine, pure coconut oil, drawbar pull performance Diterima: 8 Desember 2009; Disetujui: 16 Maret 2010
Evaluasi Kinerja Tarik Taktor Tangan Dengan Bahan Bakar Minyak Kelapa Murni ., Desrial; Purwanto, Yohanes Aris; Wiratama, Fandra
Jurnal Keteknikan Pertanian Vol 24, No 1 (2010): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Abstract Past research shown that coconut oil can be used directly in Diesel engine by adding a heating element in the fuel delivery system. This study aims to evaluate the performance of a hand tractor pull using pure coconut oil fuel. The Diesel engine of the tractor was equipped with a fuel heater installed on the mufler. Traction performance parameters tested were wheel slippage, drawbar pull, forward speed and drawbar power on the path of concrete and soil. Besides, the tractor was also tested on plowing using a moldboard plow. The test results on the concrete track showed that the maximum drawbar pull was 1.21 kN generated at a speed of 0.92 m/s, with a maximum drawbar power of 1.21 kW at the wheel slip of 10.87%. While the drawbar pull on the soil track was 1.37 kN at a speed of 0.79 m/s, with a maximum value of 0.71 kW drawbar power when wheels slip 22.25%. The results of tillage test showed that field efficiency was 84.66%, which was not much different from the test result using Diesel fuel. Keywords: fuel heater, Diesel engine, pure coconut oil, drawbar pull performance Diterima: 8 Desember 2009; Disetujui: 16 Maret 2010
Pengaruh Perlakuan Heat Shock dan Pelapisan Aloe Vera Pada Gejala Chilling Injury Untuk Tomat (Lycopersicon asculantum Mill.) ., Sutrisno; Purwanto, Yohanes Aris; M.Idris, Ismi; Hutabarat, Olly S.; ., Sugiyono
Jurnal Keteknikan Pertanian Vol 24, No 1 (2010): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Abstract This research was undertaken to determine the effect of length in heat shock and edible coating as prestorage treatment on Chilling Injury (CI) symptom reflected by ion leakage induced and quality properties in tomato (Lycopersicon asculantum Mill.). Heat Shock Treatment (HST) was conducted at three different levels of length, which were, 20, 40 and 60 min. Edible coating was conducted using aloe vera gel. The result showed that HST and Aloe Vera Coating (AVC) were more effective to reduce CI symptom at lower chilling storage. Prolong exposure to heated water may delay climacteric peak. The length of heat shock; AVC treatment and low temperature storage significantly affected the tomato quality parameter but not significantly different for each treatment except weight loss. HST for 20 min at ambient temperature was significantly different to other treatment. Keywords: ion leakage, chilling injury, climacteric, shelf-life Diterima: 2 Desember 2009; Disetujui: 22 Maret 2010
Aplikasi Jaringan Syaraf Tiruan (JST) Untuk Pendugaan Suhu Larutan Nutrisi yang Disirkulasikan dan Didinginkan Siang-Malam pada Tanaman Tomat Hidroponik Arief, Chusnul; Purwanto, Yohanes Aris; Suhardiyanto, Herry; Chadirin, Yudi
Jurnal Keteknikan Pertanian Vol 24, No 2 (2010): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Abstract Cultivation of tomato plant under hydroponics system in the greenhouse is suitable way to improve fruit quality since it is easier to control environmental parameters. In this system, water and nutrition are two important things for plant to growth. In the tropical area such as Indonesia, air temperature is main constraint in the plant production system. Increasing air temperature inside the greenhouse has positive correlation to the raising temperature of nutrient solution which affected to the ability of the plant to absord the nutrition. The effective way to anticipate increasing of its temperature is by using the cooling system of nutrient solution before circulated to the plant. This paper presented the application of Articificial Neural Network (ANN) to estimate the temperature of nutrient solution which was cooled on day-night time and circulated to the plant. ANN models, called time delay neural network, consist of 3 layers with 4 input nodes and 1 output node. As input model were t (time), Tg(i) (air temperature inside the greenhouse on time i), Tt(i) (temperature of nutrient solution in the tank on time i), Tb(i-1) (temperature of nutrient solution in the plant plots on time i-1) and as output model was Tb(i) (temperature of nutrient solution in the plant plots on time i). The model was developed well with validation result better than heat transfer model previously indicated by coefficient determination (R2) of 0.9498. Keywords: cooling, nutrient solution, hydroponic, tomato, artificial neural network Diterima: 15 Juni 2010; Disetujui: 30 juli 2010 
Indikasi kerusakan dingin pada mentimun Jepang (Cucumis sativus L.) berdasarkan perubahan ion leakage dan pH Purwanto, Yohanes Aris; Oshita, Seiichi; Makino, Yoshio; Kawagoe, Yoshinori
Jurnal Keteknikan Pertanian Vol 26, No 1 (2012): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

AbstractIn this study, the chilling induced in Japanese cucumber (Cucumis sativus L.) stored at chilled temperature and the changes in its quality during storage period were examined. Change in ion leakage and pH were used as indicator of chilling injury symptopms. The sample of cucumber were stored at 5ºC (chilling) and 25ºC (non chilling). Percentage of ion leakage for cucumber stored at 5ºC was higher than that at 25 ºC at storage time of 3, 6 and 9 days. The increase in the rate of ion leakage at 5ºC indicates the chilling induced of cell membrane. The increasing tendency of pH was observed for cucumber stored at 5ºC with the value at storage time of 9 days were higher than that at 25ºC. The increase in pH could be thought as the change in acid content which indicate the occurrence of chilling injury. Changes in ion leakage and pH indicate the change in membrane permeability which related to chilling injury. Keywords: chilling injury, ion leakage, pH, Japanese cucumber, low temperature storage Abstrak Tujuan dari penelitian ini adalah untuk menganalisis terjadinya gejala chilling injury pada mentimun Jepang (Cucumis sativus L.) yang disimpan pada suhu rendah. Perubahan ion leakage dan pH digunakan sebagai indikator terjadinya chilling injury. Sampel mentimun disimpan pada suhu 5ºC (suhu rendah) dan  and 25ºC (suhu ruang). Hasil pengamatan menunjukkan bahwa persentase dari ion leakage untuk mentimun yang disimpan pada suhu 5ºC lebih tinggi dibanding pada suhu 25 ºC pada periode penyimpanan 3, 6 dan 9 hari. Kenaikan laju ion leakage pada mentimun yang disimpan pada suhu 5ºC menunjukkan adanya pengaruh suhu rendah terhadap membran sel. Kecenderungan kenaikan pH terlihat pada mentimun yang disimpan pada suhu  5ºC dengan nilai lebih besar pada hari penyimpanan ke 9 dibandingkan dengan mentimun yang disimpan pada suhu 25ºC. Kenaikan pada pH menunjukkan terjadinya perubahan kandungan asam yang mengindikasikan terjadinya gejala chilling injury. Perubahan ion leakage dan pH menunjukkan terjadinya perubahan permeabilitas membran yang berkorelasi terhadap gejala chilling injury. Kata kunci: chilling injury, ion leakage, pH, mentimun Jepang, penyimpanan suhu rendahDiterima: 11 Oktober 2011; Disetujui: 20 Februari 2012 
Kajian Pengaruh Iradiasi Sinar Gamma Terhadap Mortalitas Lalat Buah Dan Mutu Buah Mangga Gedong (Mangifera indica L) Selama Penyimpanan Sugianti, Cicih; Hasbullah, Rokhani; Purwanto, Yohanes Aris; Setyabudi, Dondy A
Jurnal Keteknikan Pertanian Vol 26, No 1 (2012): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Abstract Gedong mango (Mangifera indica L.) is a tropical fruit that has the potential for export. But, the fruit of the mango is hosted by fruit fly. Fruit fly pests of mango export has been restrained by the very strict quarantine regulation. Therefore, it need a treatment that can annihilate the fruit fly. Irradiation technique has been one of the quarantine treatment that being attention, in order to disinfested pest attack. This research aims to study the effect of irradiation on mortality of fruit fly species Bactocera papayae (oriental fruitfly) on gedong mango, and to study the effect of irradiation dose and storage temperature on the physiology of the nature and quality of mangoes gedong. The results showed the mortality test results for B. papayae towards the dose 0.75 kGy reached until 100%. The next level was to test the mango fruit fly which considered infested naturally from the field. The dose given were 0:25 kGy, 0.5 kGy, 0.75 kGy and control. The results showed that in the control treatment founded that fruit flies growth from the day 9th to day 24th days of storage. 0.25 kGy dose and 0.5 kGy dose given were still found larva growth until the day 24th days of storage. From the test results of mortality at the dose of 0.75 kGy was able to annihilate fruit fly mortality reaches until 100%, but when applied to the fruit which has considered infested in the field were still found larvae growth until the 21st days of storage. Irradiation dose of 0.75 kGy can suppress the respiration rate, and weight losses during storage. With the irradiation dose can affected the quality of gedong mango such as vitamin C, total acid, Total Soluble Solid (TSS), and moisture content of gedong mango. Keywords: Gedong mango, Fruit flies, Irradiation, Quarantine treatment Abstrak Buah mangga gedong (Mangifera indica L.) merupakan salah satu produk hortikultura yang berpotensi untuk di ekspor. Tetapi buah mangga merupakan inang dari lalat buah. Serangan hama lalat buah menyebabkan ekspor buah mangga terhambat oleh aturan karantina yang sangat ketat. Oleh karena itu diperlukan suatu perlakuan yang dapat membunuh lalat buah tersebut. Teknik iradiasi sebagai salah satu perlakuan karantina mulai dilirik untuk tujuan disinfestasi serangga hama. Penelitian ini bertujuan untuk mempelajari pengaruh iradiasi terhadap mortalitas lalat buah (fruit fly) spesies Bactocera papayae (oriental fruitfly) pada buah mangga gedong, dan mempelajari pengaruh dosis iradiasi dan suhu penyimpanan terhadap sifat fisiologi dan mutu buah mangga gedong. Hasil penelitian menunjukkan untuk hasil uji mortalitas B. papayae terhadap dosis 0.75 kGy mencapai 100%. Tahapan selanjutnya adalah menguji buah mangga yang dianggap sudah terinfestasi lalat buah secara alami dari lapang. Besarnya dosis yang diberikan adalah 0.25 kGy, 0.5 kGy, 0.75 kGy dan kontrol. Hasil penelitian menunjukkan bahwa pada perlakuan kontrol ditemui lalat buah yang berkembang pada hari ke-9 sampai hari ke-24 penyimpanan. Pemberian dosis 0.25 kGy dan 0.5 kGy masih ditemukan larva yang berkembang hingga hari ke-24 penyimpanan. Dari hasil uji mortalitas pada dosis 0.75 kGy mampu membunuh lalat buah mencapai mortalitas 100%, namun ketika diterapkan pada buah yang dianggap sudah terinfestasi secara lapang masih ditemukan larva yang berkembang pada hari ke-21 penyimpanan. Pemberian dosis iradiasi sebesar 0.75 kGy dapat menekan laju respirasi, dan susut bobot selama penyimpanan. Dengan pemberian dosis iradiasi dapat mempengaruhi mutu buah mangga gedong seperti halnya kadar vitamin C, total asam, TPT, dan kadar air buah mangga gedong. Kata kunci : Mangga gedong, Lalat buah, Iradiasi, Perlakuan karantina.Diterima:09 November 2011;Disetujui: 13 Maret 2012 
Deteksi Chilling Injury pada Buah Mangga Gedong Gincu dengan Menggunakan Near Infrared Spectroscopy Zainal, Putri Wulandari; Ahmad, Usman; Purwanto, Yohanes Aris
Jurnal Keteknikan Pertanian Vol 26, No 1 (2012): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Abstract Chilling Injury is a major problem in storing mango fruit in low temperature wich is unavoidable in order to extend the shelf life of fruit. symptoms of chilling injury during storage associated with the change in pH due to ion leakage. Chilling injury can be detected during storage destructively, but it will require time and a lot of samples. Alternatively, the detection can be performed non-destructively by using near infrared (NIR). The purpose of this research is to build the NIR calibration models for predicting ion leakage relating with change in pH and the detection of chilling injury symptoms can be done through ion leakage storage. Reflectant NIR measurements conducted on mango fruit stored at a temperature of 8 ° C and 13 ° C. Determination of chilling injury symptoms was predicted based on change in pH and the rate of ion leakage. The analysis showed that NIR spectroscopy was able to predict the change in pH during storage of mango fruit at a temperature of 8 °C based on reflectance and PLS method. Moreover ion leakage could also be predicted properly through the pH of the NIR predictions. The developed method could detect the chilling injury on mangoes after three days storage at a temperature of 8 °C. Keywords : NIR, Mangoes fruit, chilling injury, ion leakage, pH. Abstrak Chilling injury merupakan salah satu masalah utama didalam penyimpanan dingin buah mangga, dimana penyimpanan dingin ini berfungsi untuk memperpanjang umur simpan buah. Gejala chilling injury selama penyimpanan berhubungan dengan perubahan pH yang disebabkan oleh ion leakage. Chilling injury selama penyimpanan dapat dideteksi secara destruktif, tetapi deteksi secara destruktif membutukan waktu yang lama dan sampel yang banyak. Oleh karena itu, deteksi secara non-destruktif dapat dilakukan dengan menggunakan NIR. Tujuan dari penelitian ini adalah untuk mengembangkan model kalibrasi NIR untuk dapat memprediksi ion leakage yang berhubungan dengan perubahan pH dan deteksi gejala chilling injury yang berhubungan dengan ion leakage selama penyimpanan. Pengukuran reflektan NIR dilakukan pada buah mangga yang disimpan pada suhu 8 ° C and 13 ° C. Pengukuran gejala chilling injury diprediksi berdasarkan pH dan rata-rata perubahan ion leakage. Dari hasil penelitian dapat dilihat bahwa NIR-spectroscopy mampu untuk memprediksi perubahan pH selama penyimpanan dingin buah mangga suhu 8 ° C berdasarkan data reflektan dan metode PLS. Selain itu, ion leakage dapat diprediksi dengan menggunakan pH prediksi NIR. Pengembangan metode ini, dapat mendeteksi chilling injury pada buah mangga dimana pada pendeteksian chilling injury terjadi pada hari ketiga penyimpanan suhu 8 ° C. Kata Kunci : NIR, Buah mangga, chilling injury, ion leakage, pH. Diterima: 09 November 2011.; Disetuji: 13 Maret 2012  
Effect of Heat Shock Treatment and Aloe Vera Coating to Chilling Injury Symptom in Tomato (Lycopersicon asculantum Mill.) Sutrisno, .; Purwanto, Yohanes Aris; Hutabarat, Olly S.
Jurnal Keteknikan Pertanian Vol 26, No 1 (2012): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Abstract This research was undertaken to determine the effect of length in heat shock and edible coating as pre-storage treatment to Chilling Injury (CI) symptom reflected by ion leakage induced and quality properties in tomato (Lycopersicon asculantum Mill.). Heat Shock Treatment (HST) was conducted at three different levels of length, which were, 20; 40 and 60 min.  Edible coating was conducted using aloe vera gel. The result showed that HST and Aloe Vera Coating (AVC) were more effective to reduce CI symptom at lower chilling storage. Prolong exposure to heated water may delay climacteric peak. The length of heat shock, AVC treatment and low temperature storage significantly affected the tomato quality parameter but not significantly different for each treatment except weight loss. HST for 20 min at ambient temperature was significantly different to other treatment. Keywords: heat shock treatment, aloe vera coating, ion leakage, chilling injury, tomato Abstrak Penelitian ini dilakukan untuk mengetahui pengaruh lama perlakuan panas (heat shock ) dan pelapisan bahan edibelsebagai perlakuan awal sebelum penyimpanan, terhadap gejala chilling injury (CI) yang diekspresikan sebagai terjadinya kebocoran ion (ion leakage) dan perubahan mutu pada tomat (Lycopersicon asculantum Mill.). Heat Shock Treatment (HST) dilakukan dengan pada 3 (tiga) tingkat lama perlakuan yang berbeda, yakni 20, 40 dan 60 menit. Pelapisan bahan edibel dilakukan dengan menggunakan gel lidah buaya. Hasil penelitian menunjukkan bahwa HST dan pelapisan lidah buaya (Aloe Vera Coating/AVC) lebih efektif dalam menurunkan gejala CI pada penyimpanan dengan suhu lebih rendah. Pencelupan pada air panas yang lebih lama dapat menunda pencapaian puncak klimakterik. Lamanya perlkuan panas, perlakuan AVC dan penyimpanan dengan suhu rendah secara signifikan berpengaruh terhadap parameter mutu tomat, akan tetapi tidak berbeda nyata jika perlakuan tersebut bersifat tunggal, kecuali pada parameter susut bobot. Perlakuan panas (HST) selama 20 menit pada suhu ruang berbeda secara sigifikan dibandingkan perlakuan lainnya. Kata Kunci : perlakuan panas (HST), pelapisan lidah buaya,ion leakage, chilling injury, tomat. Diterima: 27 Oktober 2011; Disetujui: 02 Januari 2012  
Identifikasi Perubahan Mutu Selama Penyimpanan Buah Manggis Menggunakan Near Infra Red Spectroscopy Sutrisno, .; Purwanto, Yohanes Aris; Darmawati, Emmy; Syaefullah, Enrico
Jurnal Ilmu Pertanian Indonesia Vol 17, No 2 (2012): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

One of quality changes during storage of intact mangosteen fruit is firmness. This occurrence was predicted to have associate with moisture content in the pericarp. The objective of this research was to determine the correlation between moisture content and firmness, and to predict moisture content changes based on reflectance spectrum of near infra red (NIR). The correlation between moisture content and firmness at 13 °C is y = 0.07972x2 – 9.833x + 305.9 while at room temperature showed y = 0.1207x2 – 14.89x + 460.8; in which y refers to firmness and x refers to moisture content in pericarp. The calibration and validation evaluation using partial least square of moisture content resulted in NIR and oven method showed that the magnitude of r is 0.758-0.882; RMSEC and RMSEP is 0.09-0.39%; CV<5% is at 2.5-3.3%. Moisture content prediction using NIR reflectant spektrum is y (temperature:8 °C) = -0.057x + 65.14; y (temperature 13 °C) = -0.253x + 64.96; y (room temperature) = -0.421x + 64.76. Keywords: chilling injury, mangosteen, near infra red, partial least square, storage quality  
Pengaruh Kadar Air terhadap Beberapa Sifat Fisik Biji Lada Putih Mukhlis, Andi Muhammad Akram; Hartulistiyoso, Edy; Purwanto, Yohanes Aris
Agritech Vol 37, No 1 (2017)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/agritech.15308

Abstract

The physical properties of seed are required in designing an  apparatus for handling, separation, drying, storage, and processing. The physical properties of white pepper seeds were  determined as a function of moisture content in the range of  15,40 - 64,80 % dry basis (d.b.). The average height, length and width at a moisture content condition of 15,40 % (d.b.) were 4,11 ± 0,27 mm; 4,35 ± 0,34 mm and 4,35 ± 0,35 mm, respectively.  In the range of moisture content 15,40 - 64,80 % (d.b.), the  results of this study showed an increase linearly of the third axial  dimension, the average diameter, the roundness from 0,969 to 0,977, the volume from 39,50 to 67,34 mm3, the surface area  from 55,87 to 79,92mm2 and the thousand seed mass from  52,47 to 75,63 g. Bulk density and true density has a polynomial  correlation with changes in moisture content.The porosity  decreased from 45,01 % to 44,88 % with an increase in the  moisture content range of 15,40 - 64,80 % (d.b.). ABSTRAKSifat fisik biji-bijian diperlukan dalam merancang suatu peralatan  untuk penanganan, pemisahan, pengeringan, penyimpanan dan  pengolahannya. Sifat fisik biji lada putih ditentukan sebagai  fungsi kadar air pada rentang 15,40 - 64,80 % basis kering  (b.k.). Tinggi, panjang dan lebar rata-rata pada kondisi kadar air  15,40 % (b.k.) adalah 4,11 ± 0,27 mm; 4,35 ± 0,34 mm dan  4,35 ± 0,35 mm berturut-turut. Pada rentang kadar air 15,40 -  64,80 % b.k., hasil penelitian ini menunjukkan peningkatan  secara linear pada ketiga dimensi aksial, diameter rata-rata,  kebulatan dari 0,969 hingga 0,977, volume dari 39,50 hingga  67,34 mm3, luas permukaan dari 55,87 hingga 79,92 mm2 dan  massa seribu biji dari 52,47 hingga 75,63 g. Bulk density dan true density memiliki hubungan polinomial dengan perubahan kadar  air biji. Porositas menurun dari 45,01 % hingga 44,88 % dengan  peningkatan kadar air pada rentang 15,40 - 64,80 % (b.k.).