Warji ,
Staf Pengajar pada Jurusan Teknik Pertanian Universitas Lampung

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RANCANG BANGUN SISTEM SORTASI CERDAS BERBASIS PENGOLAHAN CITRA UNTUK KOPI BERAS Asmara, Sandi; ., Warji
Jurnal Keteknikan Pertanian Vol. 24 No. 2 (2010): Jurnal Keteknikan Pertanian
Publisher : PERTETA

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Abstract

AbstractLampung Province is the largest producer of cassava in Indonesia. Cassava has a weakness that is easily damaged and could not be stored longer. To overcome this, there is a need of an effective drying process so that cassava can be processed into other materials of lower power use as well as its economic value. A hybrid drying system is one solution to resolve the issue. The purpose of this research is to study the performance of drying cassava chips by using a hybrid type of dryer rack. The process of drying cassava chips made using a three-stage treatments with three replicates with the input load of 30 kg of cassava chips. The results showed that the pattern of decline in water levels in each treatment is uneven. The time needed to dry cassava chips to reach the water content of 10% - 12% in the drying of materials using sunlight for 18 hours, using electrical energy for 16 hours and use the energy of sunlight and electricity for 12 hours. The higher temperatures produced the shorter the time required in the drying process. Electrical energy required for the drying process using electric energy was 91 440 kJ and drying using electrical energy and sunlight was 68600 kJ.Keywords: cassava chip, drying, dryer hybridDiterima: 13 Maret 2010; Disetujui: 17 Setember 2010
KARAKTERISTIK PENGERINGAN KULIT MANGGIS DENGAN ALAT PENGERING HIBRID TIPE RAK Hartanto, Rofandi; Warji, .; Rusdiyanto, Wahyu
JURNAL AGROTEKNOLOGI Vol 5 No 02 (2011)
Publisher : Faculty of Agricultural Technology, University of Jember

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Abstract

Number of constraints in drying of mangosteen peel came as problem in handling of the product. The hybrid drying system was chosen as an alternative to dry the mangosteen peel. The treatments performed in this research were: the rack dryer hybrid where sunlight, electric, and combination of sunlight and electric source, and as a comparison were used the para-para dryer. Combination of sunlight and electric source has the highest temperature that was 48.5 C deg. using electric source was 38.1 C deg., whereas using sunlight source was 39.6 C deg. and using para-para dryer was 33.6 C deg. Drying with combination of sunlight and electric source was the most rapid in moisture evaporation. While as a comparison was used the para-para dryer, that was the slowest one. Drying efficiency using sunlight source was 29.6%, while the drying efficiency using electric source was 51.5%, and the combination of sunlight and electric source was 28.7%. It was concluded that the hybrid dryer could be used as an alternative to dry mangosteen peel.Keywords: mangosteen peel, drying energy source, drying efficiency
Performance Test Hammer Mill With Corn Feed Corncob Rahmadian, Octa; Triyono, Sugeng; Warji, Warji
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 1, No 1 (2012)
Publisher : The University of Lampung

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Abstract

Corn cob is one abundant agricultural waste and potentially viable for animal feed.  Objective of this research was to test a hammer mill to crush the corn cob.  The study was made in two different rotational speeds, 800 rpm and 1400 rpm. A perforated screen (underneath the rotating hammer drum) with 1 cm hole size was used.  The test was conducted in three replications and each replication used 5 kg corn cob.  Variables observed included uniformity of grain sizes of the product and machine capacity.  The expected grain sizes ranged 3 to 7 mm.  The results showed that this machine performed better under 1400 rpm than under 800 rpm.  With 1400 rpm, the machine produced the expected grain sizes of the product about 45,57% by weight, and had a capacity about 15,62 kg/hour. Keywords: Corn cob, Hammer mill, Capacity, Energi consumtion.
DESIGN AND PERFORMANCE TEST OF JOBS TEARS (COIX LACRYMA JOBI L.) THRESHER MACHINE SOLID CYLINDER ROLL TYPE Saputra, Ady; Hartanto, Rofandi; ., Warji
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 2, No 3 (2013)
Publisher : The University of Lampung

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Abstract

Jobs tears (Coix Lacryma-jobi L.) was a cereal crop that used as high nutrient food and animal feed ingredients. The purpose of this research was to design and test the performance of jobs tears seeds thresher machine of solid cylinder roll type. The machine parts consisted of machines frame, threshing cylinder, jobs tears seeds container, gear transmission, gearbox, and electric motors. Design process of its consisted of structural design and functional design to managed all parts of threshers. This machine was driven by an electric motor. The power and rotational speed of electric motor was 1 HP (1.400) rpm that was transmitted to the gearbox by V-belt and pulley. Speed of electric motor rotation was modified from1,440 rpm to 30 rpm, 38 rpm and 50 rpm by a gearbox with 1:30 ratio. gearbox rotation was transmitted to threshing tool (solid cylinder roll).  Rotation of this two solid cylinders roll  had a clearance of 6,5 mm that suppressed jobs tears seeds, so the seeds could be separated from the stems.  This research resulted the jobs tears seeds thresher machine of solid cylinder roll type. The optimum rotation speed of cylinder was 50 rpm, with loss percentage 79.68% and percentage of good threshed jobs tears seeds 88.57%. This machine had a work capacity of 50,45 kg jobs tears seeds per hour. Keywords: Jobs tears, Thresher of solid cylinder roll type.
EFFECT OF TEMPERATURE AND CONCENTRATION ON THE ABSORPTION OF SUGAR SOLUTION IN BENGKUANG (Pachyrrhizus erosus) Arlita, Malyan Afri; Waluyo, Sri; ., Warji
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 2, No 2 (2013)
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (283.786 KB) | DOI: 10.23960/jtep-l.v2i2.%p

Abstract

Processing of foodstuffs mostly involves temperature and water. Interaction among the product, temperature and water changes the physical and chemical properties. The aim of this research was applying the Peleg’s equation to evaluate the effect of temperature and concentration of sugar solution on the absorption of sugar into bengkuang (Pachyrrhizus erosus). This research was designed at two different variables, which were temperature and concentration of sugar solution. The temperature was seted up at three levels : 30 oC, 40 oC and 50 oC, meanwhile the concentration was made at three levels : 20,6 oBrix, 30,7 oBrix and 40,7 oBrix. Three replications were conducted in each combination of the treatments along 450 minutes immersion duration. The results showed that the soaking temperatures affected to the absorption rate of sugar solution into bengkuang. The higher the soaking temperature the higher is the absorption rate. It was occurred the physical changes of bengkuang during soaking. The dimensions of the speciments decreased during immerse in the warm sugar solution. It may caused by water in the product comes out from the body. Furthermore, it proved that coefficient k1 of Peleg’s equation relates to temperature. The increasing of temperature was followed by decreasing of k1. At 30 oC and the concentration of 20,6 oBrix, the k1 is 0,254. It decreased become 0,124 at temperature of 50 oC. The decreasing of k1 was less with increasing of the concentration. Meanwhile, the coeffients k2 decreased with increasing of the concentration. At temperature of 30 oC and concentration of 40,7 oBrix, k2 is 19,76. It decreased become 14,11 at concentration of 40,7 oBrix. The decreasing of k2 was less with increasing temperature. Keywords: Bengkuang, immersion, temperature, sugar concentration, physical properties
CHARACTERIZING OF ONGGOK FLOUR USING THREE DIFFERENT DRYING METHODS Sari, Marinda; -, Warji; Novita, Dwi Dian; -, Tamrin
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 2, No 1 (2013)
Publisher : The University of Lampung

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Abstract

The processing of cassava becoming tapioca flour will produce solid fiber waste called as onggok.  Onggok can be used as raw material for making onggok flour.  One of the processing steps on the producing of onggok flour is drying.  In common practice, solar dryer is used but it takes long time and strongly depends on weather.  The hybrid dryer (solar electrical energy), solar radiation dryer, and electrical dryer would be used in this research.  The aims of this study were to determine and to compare whiteness degree, the degree of acidity (pH), and the characteristics of onggok flour (color and aroma) and its organoleptic justification of onggok flour dryed by the three different drying methods.  The results showed that drying process under solar radiation dryer produced onggok flour at better color compared with the others, drying process using electrical dryer produced onggok flour at better aroma compared with the others, the best product based on organoleptic tests was onggok  flour dried by electrical dryer with color criteria a little white, the aroma criteria slightly cassava aromaed, and overall acceptance a bit like. Keywords: Onggok flour, drying, aroma, flour color
UJI KINERJA PROTOTIPE ALAT PEMBERSIH GABAH Sudirman, Yadi; Waluyo, Sri; ., Warji
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 3, No 1 (2014)
Publisher : The University of Lampung

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Abstract

Separation of paddy from empty grains and unexpected materials is one step in post harvest handlings done usually after cutting.  This step is acquired to have the high quality of paddy.  Separation that conventionally done by farmers, in general, is inefficient and can pose difficulties such us: high losses, high energy need, time consuming and depend on weather.  Application of separation machine is needed as an alternatif to overcome to those difficulties.  The purpose of this test is to determine the capacity and efficiency of work time required. The research was done in some steps: design of the equipment, manufacturing, testing and finally, data analysis.  The test was conducted in 3 levels of wind mover: 850 rpm, 1070 rpm and 1300 rpm.  Observation was focused on the percentage of empty grain, duration of separation and work capacity.  From the results, it can be concluded that the best wind mover for separation was 1070 rpm.  It could separate filled and empty grain effectively at 96,06%.  The average of work capacity of the equipment was 127,07 kg/hour.Keywords: Separation, rpm, Paddy.
VALIDASI PERSAMAAN BATAS KERUSAKAN MANGGA ARUMANIS BERDASARKAN ZERO MOMENT POWER Warji, Warji; Suroso, Suroso; Hasbullah, Rokhani
Jurnal Teknologi & Industri Hasil Pertanian Vol 12, No 2 (2007): Jurnal Teknologi & Industri Hasil Pertanian
Publisher : Teknologi Hasil Pertanian Fakultas Pertanian Universitas Lampung

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Abstract

The objectives of this research were to validate the border equation of arumanis mangoes damage caused by fruit fly using zero moment power (Mo) number. The method is based on measurement of zero moment power ultrasonic wave in arumanis mangoes. Results showed that mean of Mo number normal arumanis mangoes was 4,58 and Mo number arumanis mangoes damage caused by fruit fly was 6,40. Prediction equation was Mo number more than 5,60  for normal mango and Mo number less than or same 5,60 for mangoes invested by fruit fly. Keywords: ultrasonic, arumanis mangoes, fruit fly, Mo number, validation.
UJI KINERJA ALAT PENGERING HYBRID TIPE RAK PADA PENGERINGAN CHIP PISANG KEPOK Sari, Ika Novita; ., Warji; Novita, Dwi Dian
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 3, No 1 (2014)
Publisher : The University of Lampung

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Abstract

Lampung Province was one of the banana production centers areas in Indonesia, one of them is kepok banana.  Bananas dont have a long shelf life, so that it needs an alternative treatment to prolong shelf life so it can provide the value-of banana fruit.  Drying system with hybrid is an alternative option. The purpose of this study is to test the performance of the hybrid dryer shelves type for drying banana chips.  This research was conducted with three treatments, they were drying using solar energy, drying using electrical energy, and drying using solar energy and electricity, which was using 5 kg banana chips for each treatments.  The three treatments of this research showed different results.  It took 9 hours to drying banana chips until it reached the water content 10%-12% on drying using solar energy, while drying using electrical energy needed 11 hours, and 8 hours on drying using solar energy and electricity.  Energy produced on drying using solar energy amounted to 55859,52 kJ, drying using electrical energy amounted to 27680,4 kJ and drying using solar energy and electricity was 64417,17 kJ. Keywords: Kepok banana chips, drying, the shelves type hybrid dryer
Modification of Rice Thresher-Hammer Thresher Type Harbi, Ahmad; -, Tamrin; -, Warji; Lanya, Budianto
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 1, No 1 (2012)
Publisher : The University of Lampung

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Abstract

The thresher rice has developed in previous research is instrument thresher rice type hammer thresher. But the threshing not going well, Where rice stalk is still difficult to get out of the thresher. The objective of this research is to modify machine  type paddy thresher hammer . Modification is conducted by adding director channel in upper wall of threshing chamber and to change straw exiting channel near the feeder with size of 15 cm width and 19 cm height. By this method, paddy straw is expected to exit from threshing chamber and threshing process can run smoothly. Methods used is Modification tools, testing modification result, observation and data collection. Observations are made to percentages of threshed paddy grain, percentage of unthreshed paddy grain, good threshed paddy grain, percentage of damaged threshed paddy grain, threshing duration, and working capacity of the machine per hour. Keywords: Thresher rice, thresher rice type hammer, modify machine thresher.