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All Journal Agrointek Jurnal Sain Peternakan Indonesia Naturalis : Jurnal Penelitian Pengelolaan Sumberdaya Alam dan Lingkungan Jurnal Teknologi Pertanian agriTECH Jurnal Agroindustri Industria: Jurnal Teknologi dan Manajemen Agroindustri Indonesian Food and Nutrition Progress AGRITROPICA : Journal of Agricultural Sciences JMM (Jurnal Masyarakat Mandiri) Dharma Raflesia : Jurnal Ilmiah Pengembangan dan Penerapan IPTEKS Jurnal AGRISEP: Kajian Masalah Sosial Ekonomi Pertanian dan Agribisnis
Yuwana Yuwana
Jurusan Teknologi Pertanian Fakultas Pertanian Universitas Bengkulu Jalan WR. Supratman, Kandang Limun, Bengkulu 38371, Indonesia
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Medicine & Pharmacology Social Sciences Veterinary Other

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Model Kurva dan Pendugaan Lama Waktu Pengeringan Tandan Kosong, Pelepah dan Serat Tandan Kosong Kelapa Sawit Y Yuwana
AGROINTEK Vol 12, No 1 (2018)
Publisher : Agroindustrial Technology, University of Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/agrointek.v12i1.3242

Abstract

Biomassa originated from palm oil plant is potential to be processed into various industrial products. In the production line this material needs to dry into certain level of moisture content, mostly about 10% (wet basis) and commonly called as dry material. It is advantageous if the dryng time to produce a dry material can be predicted. Prediction is usually approached by setting up drying model of the material. The most common drying model in formulated in the form of moisture ratio in function of drying time in which the moisture content is calculated in dry basis. On the other, in practice, the moisture content of material is expressed in wet basis. The objectives of this research were to determine the drying curves and to predict the drying times of palm oil empty fruit bunches, stem and fiber dried from solar dying and oven drying. Three series of experiments were carried out according to the types of materials. The results of the experiments revealed as follows. The curves produced by the solar energy dryer operating at drying temperatures ranged from 42oC to 54,5oC for both empty fruit bunches and stem were quadratic whereas the curves produced by the oven having temperature of 105 oC for stem and fiber were linear and quadratic respectively. The form of curves obtained from the relationships between materials moisture contents determined in wet basis and drying times were similar to the curves of materials moisture ratios in function of drying times. The drying times of the solar energy drying for the empty fruit bunches were 20 hours dan 19.3 hours for Dura variety and Tenera variety respectively while those of stems were 16.3 hours and 17.9 hours respectively for Dura variety and Tenera variety. The drying times of the oven drying for the stems were 7.1 hours, 6.9 hours and 5.0 hours respectively for the lower, middle and upper parts of the stems. The drying times of oven drying for the fibers were 6.4 hours and  6.2 hours respectively for the outer and inner field stacks empty fruit bunches origins
Pendugaan kerusakan Akibat Impak pada Buah Apel dengan Metode Elemen Hingga Yuwana Yuwana
agriTECH Vol 23, No 4 (2003)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1791.601 KB) | DOI: 10.22146/agritech.13500

Abstract

Damage caused by impact in apple was predicted using finite element method Apple model was axi-•ymetric three dimensions consisted 779-1 tetrahylrical elemeitts with 1612 nodes representing an apple having 2.5 AlPa Yon; modulus, 0.145 Poisson ratio. 134.5 g mass and 164,4 cm . Impact was simulated by employing an acceleration of 135 g (g = 9,81m/s1) on the model. During simulation, damage was supposed to occur when the stress suffered by cell was greater than its strength. The strength of cell was adopted from the previous study which was 0.44 Zone q" damage resulted by impact was compared to the damage of the real apple caused by impact with the same energy level. The result of the simulation indicated that- the zone of damage in the apple matched to the damage of the real apple. This finding suggested that the finite element method could be employed to accurately predict the damage mechanism caused by impact on apple.
LEVELS OF FRESHNESS AND PHYSICAL DAMAGE IDENTIFICATION OF FISH AVAILABLE FOR COMSUMERS AT PASAR MINGGU MARKET BENGKULU Novia Lestari; Yuwana Yuwana; Zulman Efendi
Jurnal Agroindustri Vol 5, No 1 (2015)
Publisher : BPFP Faperta UNIB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/j.agroindustri.5.1.44-56

Abstract

The purpose of this research was to identify level of freshness of some fishes available at Pasar Minggu Market in Bengkulu City based on SNI 01-2729.1-2006.  The research was done by observing the available Sarden (Sadinella spp), Tuna (Thunnus spp), Tongkol (Euthynnus pelamial), Bawal Putih (Pampus argenteus) and Kakap Merah (Lutjanus malabaricus) in the morning (07.00 am), noon (12.00 am) and evening (17.00 am) for their freshness during September to Oktober 2013. Result of the research indicated that all of the observed fishes were fresh in the morning; only Sarden became unfresh at noon, and all of the observed fish has turned to unfresh anymore in the evening. Types of physical damage for Sarden was that its stomach was out and its head was off, for Tuna and Tongkol were bruish, injury, and material in the body of fish; for Bawal and Kakap were bruish and injury.
RELATIONSHIP BETWEEN TEMPERATURE OF DRYER CHAMBER AND RATE OF FUEL SUPPLIES FROM THREE KINDS OF BIOMASS FUEL Meidi Satriawan Sipayung; Yuwana Yuwana; Bosman Sidebang
Jurnal Agroindustri Vol 5, No 2 (2015)
Publisher : BPFP Faperta UNIB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/j.agroindustri.5.2.118-127

Abstract

The purpose of this study was to determine the number of supply of (initial and subsequent) fuel to achieve the target temperature and determine the rate of fuel supply relationship with temperature drying chamber. Biomass was used are palm shells, pecan shells and coconut shells. Results of research showed that fuel supply rate (Q / 40 min) to produce a temperature (T), which is different from the fuel pecan shells, palm shell and coconut shell follows the following equation: initial supply hazelnut shells obtained from the equation T = 13,9Q + 19.3 with R² = 0.983 and the subsequent supply is obtained by the equation T = 12,24Q + 39 with R² = 0.971, the initial supply of palm shells obtained from the equation T = 8,925Q + 29.55 with R² = 0.964 and the subsequent supply is obtained by the equation T = 15 , 27Q + 29.09 with R² = 0.989, the initial supply of coconut shell derived from the equation T = 19,8Q + 0.6 with R² = 0.972 and the subsequent supply is obtained by the equation T = 19,37Q + 34.86 with R² = 0.994 .
BUSINESS COMPETITIVENESS IMPROVEMENT ANALYSIS ON DRY FISH PROCESSING INDUSTRY IN BENGKULU CITY Evanila Silvia; Sigit Mujiharjo; Yuwana Yuwana; Kurnia Herlina Dewi
Jurnal Agroindustri Vol 5, No 1 (2015)
Publisher : BPFP Faperta UNIB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/j.agroindustri.5.1.1-11

Abstract

Purpose of this research was to identify environmental factors in terms of strength, weakness, opportunity, and threat influencing dry fish processing industry position, and formulating strategic to improve competitiveness the dry fish processing industry in Bengkulu City.  Method applied was descriptive analysis using SWOT matric, EFE matric, IFE matric.  Research location was in Bengkulu City which was selected on purpose. Respondents were academic (1 person), bureaucrat (1 person), practical person (2 person). Result of the research showed that the internal factor consisted 12 strength strategic factors and 15 weakness strategic factor.  The external strategic factor was composed by 13 opportunity strategic factors and 6 threat strategic factors. Strategic factor being capable to improve competitiveness were 1) product diversityin term of labeland market segment, 2) quality product improvement that capable to specify, and 3) improve sale service.
PHYSICAL CHARACTERISTICS OF FRUIT, BEANS, AND POWDER OF COFFEE HARVESTED FROM SINDANG JATI VILLAGE, REJANG LEBONG DISTRICT Oriza Sativa; Yuwana Yuwana; Bonodikun Bonodikun
Jurnal Agroindustri Vol 4, No 2 (2014)
Publisher : BPFP Faperta UNIB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/j.agroindustri.4.2.65-77

Abstract

Most of farmers especially in Rejang Lebong, Bengkulu, cultivaterobusta coffee.Through the preliminary observations there have been obtained bad post harvest handling, as the fruit cherries mixed green, yellow, and red; that reduced quality of coffee beans from smallholder plantations. To improve yields and product, good attention to farmers harvest, harvesting the coffee berries have a decent harvest to be able to compare the different characteristics of the coffee fruit.This research using Chi-square analysis to calculate significant difference or not in the process harvesting different ways, and using ANOVA analysis and LSD (Least Significant Difference) to calculate the real difference or not significantly different in mass density, spersitas fruit fresh coffee and coffee beans. Based on the Chi-square analysis obtained differences in the percentages of different crops on fresh fruits (red, yellow, green) with a different way of harvest. Based on the analysis of ANOVA and LSD test obtained density difference, spersitas there are distinct differences between coffee red, yellow and green
QUALITY PROFILE OF DRIED FISH PRODUCED USING YTP-UNIB-2013 WITH VARIED DRYING TEMPERATURES Iis Darniati; Yuwana Yuwana; Syafnil Syafnil
Jurnal Agroindustri Vol 5, No 1 (2015)
Publisher : BPFP Faperta UNIB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/j.agroindustri.5.1.12-19

Abstract

Objectives of this research were 1) to determine fish drying time YTP-UNIB 2013 biomass dryer with four different temperatures; 2) to compare the resulted dry fishes to SNI Standards for fish; 3) to find the optimum drying temperature to produce dry fish with better fit to SNI standards.Utilizing “ Kaseh” fish (Opisthopterus tardoore) as experimental sample dryings with temperatures 30-40 oC, 40-50 oC, 50-60 oC and 60-70 oC, in term of drying time, resulted 10 hours, 8 hours, 6.5 hours and 5.5 hours respectively. From the TPC point of view, the dry fishes produced by these temperature ranges contained 1,16 x 106 kol/g, 1,0875 x 106 kol/g, 0,744 x 106 kol/g and 0,8975 x 106 kol/g. These dry fishes fitted respectively to 8.6, 8.8, 8.4 and 7.8 average organoleptical scores. The finding suggested that drying with 50-60 temperature ranges would be proper choice for drying fish with YTP-UNIB 2013 biomass dryer.Keywords : 
YSD UNIB 12 SOLAR DRYER PERFORMANCE FOR ROBUSTA CAFFEE DRYING Simon Julian Sastro; Yuwana Yuwana; Evanila Silvia
Jurnal Agroindustri Vol 4, No 2 (2014)
Publisher : BPFP Faperta UNIB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/j.agroindustri.4.2.78-85

Abstract

This article presents the results of research that aims to determine the performance of the dryer YSD UNIB 12 in dry Robusta coffee. Observation parameters are divided into two test groups, namely: Test performance of the dryer without a test load and dryers with load performance. Parameter observations on no-load test include temperature and relative humidity in the dryer and outside the dryer (control) while the parameters of observation to the test with a load includes temperature and humidity inside and outside the dryer, coffee moisture content decreased with the thickness of the drying 5 cm, 7 cm and 9 cm and capacity dryers. From the no-load test observations, the average temperature conditions outside air ranged between 26°C - 33°C and relative humidity of 63% - 92%, smoking can increase the drying chamber temperature between 30°C - 45°C and relative humidity 43% - 82%. Test observations with the load on the outside air conditions 29°C - 32°C and a relative humidity of 59% - 79%, the temperature inside the kiln reaches between 36°C - 40°C and relative humidity ranged between 44% - 58% while decreasing moisture content of coffee following equation MC = 59.61 e-0, 03t for drying 9 cm thickness, MC = 61,16e-0, 03t for drying 7 cm thickness and MC = 62.39e-0, 03t for drying thickness of 5 cm. Of these equations are known to use the dryer drying speed is slower than the traditional drying but use a dryer can save an area of 1,09-fold.
RELATIONSHIP BETWEEN WEIGHT AND PHYSICO-MECHANICAL PROPERTIES OF COFFEE GRAINS PRODUCED FROM DIFFERENT HARVEST RIPENING Yuwana Yuwana; Evanila Silvia; Bosman Sidebang
Jurnal Agroindustri Vol 4, No 1 (2014)
Publisher : BPFP Faperta UNIB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/j.agroindustri.4.1.21-30

Abstract

This research aimed to determine relationships between weight and several physic-mechanical properties of coffee grains. Grains having 12.2% (wet basis) moisture content in average, originated from cherries of different ripening levels identified by green, yellow, red and deep red in colors were used for experiment. Research used regresi linear analysis. Results of experiment indicated that weight of grains positively correlated to length, width, thickness and frontal area with very high values of determination coefficient. Weight of grains correlated positively to sphericity and negatively to porosity. Weight of grains originated from green and red cherries had positive correlation with density whereas weight of grains originated from yellow and deep red cherries possessed no correlation with density. Weight of grains from yellow, red and deep red cherries had negative correlation with true density in contrast weight of grains from green cherries had positive correlation with true density. There were no reliable trend concerning the relationships between weight of grains and coefficient of static friction and angle of repose.
PERFORMANCE OF MODIFIED HYBRID SOLAR DRYER ON THE DRYING PROCESS OF ROBUSTA CHERRY COFFEE Evanila Silvia; Yuwana Yuwana; Bosman Sidebang
Jurnal Agroindustri Vol 9, No 2 (2019)
Publisher : BPFP Faperta UNIB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/j.agroindustri.9.2.94-101

Abstract

Drying process is one of the most critical post-harvest stages because it can affect the quality of coffee beans. To overcome the obstacles that are often encountered in the drying process, many solar energy dryers have been developed with various ways of energy utilization and its characteristics, one of them is Modified Hybrid Solar Dryer. The purpose of this study was to test the performance of the furnace and heater distributor (temperature and humidity of the drying chamber) compared to the temperature and humidity outside the dryer when drying coffee cherries at 3 variations in the thickness of the sunbed; 5, 10 and 15 cm. Parameters of the performance of furnaces and heating distributors are: 1) the drying chamber temperature and the outside environment, 2) the relative humidity of the drying chamber and the outdoor, 3) the speed of the airflow in the drying chamber and 4) the drying time. Testing (experiments) carried out in 3 series, and the measurement results are averaged. Observations were made every 30 minutes from 9:00 am to 06:00 am for three days. Parameters of the quality of the effects of drying coffee beans: 1) the initial weight of the coffee beans, 2) the weight loss of the coffee cherries during drying; conducted moisture content of coffee cherries every hour from 09.00 am to 06.00 am. 3). The results obtained are the furnace and distributor of hybrid solar dryer heat able to increase air temperature is 19,25oC higher than the outside air temperature and reduce relative humidity 46,02% lower than the average relative humidity of the outside air with an average speed of airflow in the range of 0,42 – 0,50 m / s. Hybrid solar dryers can finish drying coffee fruits much faster in about 60 hours (15 cm thickness), 52 hours (10 cm thickness), and 36 hours (5 cm thickness) compared to sun dryingProses pengeringan merupakan salah satu tahapan pasca panen yang sangat kritis karena dapat mempengaruhi kualitas biji kopi. Untuk mengatasi kendala yang sering ditemui pada proses pengeringan,  banyak dikembangkan pengering berenergi surya dengan berbagai cara pemanfaatan energi dan karakteristiknya, salah satunya pengering surya Hybrid Modified. Tujuan dari penelitian ini adalah menguji kinerja tungku dan distributor pemanas (temperatur dan kelembaban ruang pengering) dibandingkan dengan temperatur dan kelembaban di luar pengering saat mengeringkan buah kopi pada 3 variasi ketebalan jemur yaitu 5, 10 dan 15 cm. Pengujian kinerja tungku dan distributor pemanas dilakukan dengan mengukur : 1) temperatur ruang pengering dan lingkungan luar,  2) kelembaban relatif ruang pengering dan lingkungan luar, 3) kecepatan aliran udara di ruang pengering dan 4) waktu pengeringan. Pengujian (percobaan) dilakukan 3 seri dan hasil pengukuran dirata-rata. Pengamatan dilakukan tiap 30 menit mulai pukul 9.00 sd 06.00 wib selama 3 hari. Pengamatan kualitas hasil pengeringan biji kopi dilakukan dengan mengukur : 1) berat awal buah kopi, 2) berat buah kopi selama pengeringan, dilakukan setiap jam dari pukul 09.00 sd 06.00 WIB. 3) kadar air biji kopi. Hasil yang diperoleh adalah tungku dan distributor panas pengering surya hybrid mampu meningkatkan temperatur udara adalah 19,25oC lebih tinggi dari temperatur udara luar dan menurunkan kelembaban relatif 46,02% lebih rendah dari kelembaban relatif rata-rata udara luar dengan kecepatan rata-rata aliran udara berkisar 0,42 – 0,50 m/s. Pengering surya hybrid dapat menyelesaikan pengeringan buah kopi jauh lebih cepat sekitar 60 jam (ketebalan jemur 15 cm), 52 jam (ketebalan jemur 10 cm) dan 36 jam (ketebalan jemur 5 cm) dibandingkan penjemuran biasa 
Co-Authors Agus Susatya Ali Setia Iskandar Andre Zuliansyah Arina Fatharani Arthia Isah Hartanti Lumbanraja Atra Romeida B. Sidebang Bambang Sumantri Bieng Brata Bonodikun Bonodikun Bosman Sidebang Budiyanto Budiyanto Damres Uker Deddy Bakhtiar, Deddy Defi Ermayendri Dwi Tyas Pambudi E. Sulistyowati Edi Silamat Evanila Silvia Evanila Silvia Evanila Silvia Evanila Silvia Evanila Silvia Evanila Silvia Futra, Febby Dwi Iis Darniati Indarwanto Indarwanto Jalin Elsaprike Kurnia Herlina Dewi Laili Susanti Lukman Hidayat M. Zulkarnain Yuliarso Meidi Satriawan Sipayung Mohammad Chozin Muhammad Nofal Novia Lestari Nurqutni Nurqutni Oriza Sativa Ridwan Yahya Sidebang, Bosman Sigit Mujiharjo Sigit Sudjatmiko Simon Julian Sastro Sistanto Sistanto Syafnil Syafnil Syafnil Wahyudi Febrianto Putra Wuri Marsigit Yar Johan, Yar Yudhi Harini Bertham Zainal Arifin Zainal Muktamar Zulfia Memi Mayasari Zulman Efendi