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All Journal Jurnal Rekayasa Pangan dan Pertanian Jurnal Keteknikan Pertanian Jurnal Celtic agriTECH Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Aquasains : Jurnal Ilmu Perikanan dan Sumberdaya Perairan Jurnal Teknologi & Industri Hasil Pertanian Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) e-Jurnal Rekayasa dan Teknologi Budidaya Perairan Batoboh : Jurnal Pengabdian Pada Masyarakat Riau Journal of Empowerment Jurnal Abdi Insani Indonesian Journal of Engagement, Community Services, Empowerment and Development (IJECSED) Jurnal Profesi Insinyur Universitas Lampung Transformasi Jurnal Puruhita Jurnal Agricultural Biosystem Engineering Jurnal Rekayasa Lampung (JRL) Seminar Nasional Insinyur Profesional (SNIP) Jurnal Pengabdian Pada Masyarakat Jurnal Pengabdian Masyarakat Bangsa Journal of Entrepreneur, Business and Management Metathesis: Journal of English Language, Literature, and Teaching Jurnal Pengabdian Masyarakat Nasional Jurnal Pengabdian Fakultas Pertanian Universitas Lampung Language Circle : Journal of Language and Literature

Sri Waluyo

Jurusan Teknik Pertanian Fakultas Pertanian Universitas Lampung Jl. Prof. Dr. Sumantri Brojonegoro No. 1, Bandar Lampung 35145

Author-ID : 450197

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THE INFLUENCE OF SOAKING TEMPERATURE ON THE COEFFICIENT OF DIFFUSION AND PHYSICAL CHARACTERISTICS OF SOYBEAN (Glycine max Merrill) Pratiwi, Yuanita Kusuma; Waluyo, Sri; -, Warji; ., Tamrin
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 2, No 2 (2013)
Publisher : The University of Lampung

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Soybean (Glicine max Merrill)is an important agricultural commodity and very popular in Indonesia as a raw material of such food stuffs for exemple: tempe.Â In the producing of tempe, soybean must be submerged in the water.Â The soaking process usually is done at room temperature for about 24-48 hours. The longer time of soaking can cause microbial contamination and may affect to the color change, bad taste and moldy smell.Â Submersion in warm water is a method that can be used for shortening the soaking time.Â The aims of this research were to study the effects of the soaking temperatures on the water diffusion coeffisien and physical characteristics of soybean (moisture content, weigh and dimension).Â The research was carried out at 5 levels of soaking temperature:30 Â°C (as a control), 35 Â°C, 40 Â°C, 45 Â°C, and 50 Â°C with 3 replications for each treatment. During soaking, sample was taken for measuring its moisture content, dimensional, and weight changes.Temperature history was recorded during soaking. The result showed that there were significant changes ondimension, weight, and water content during soaking. Those parameters increased as the soaking temperaturewas rised. The diffusion coefficient of soybean also increased with rising of soaking temperature. The analysis found that the diffusion coefficients of soybean at temperature of 30 Â°C, 35 Â°C, 40 Â°C, 45 Â°C, and 50 Â°C were respectively, 16.4 x 10-11 m2/s; 20.7 x 10-11 m2/s; 38.9 x 10-11 m2/s; 56.3 x 10-11 m2/s and 139 x 10-11 m2/s. The rate of diffusion followed an exponential equation D = 0.058 e0, 1051 / T(RÂ² = 0.960). Keywords: Diffusion coefficient, Soybean, Soaking Temperature, Physical Characteristics

PHYSIOLOGY CHARACTERISTICS OF MANGOSTEEN (Garcinia Mangostana L.) AT MODIFIED ATMOSPHERE CONDITION Agustina, Nanik; Waluyo, Sri; -, Warji; -, Tamrin
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 2, No 1 (2013)
Publisher : The University of Lampung

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The entry of water into seed until reached saturation point on the soaking process at room temperature, in common, may take more than one day. Mean while, longer soaking time can cause microbial contamination and may influence product quality in term of color, taste, and smell. Soaking in warmer liquid method is a common method used for shortening the soaking time. The objective of this research was to determine the effect of soaking temperature on the coefficient of diffusion and on the physical properties of Kidney bean (Phaseolus vulgaris L.). The research was conducted at 5 different soaking temperatures: 28 oC (control), 35 oC, 40 oC, 45 oC, and 50 oC, with 3 replications for each treatment. The parameters measured were dimensions of specimen, weight of specimen during soaking. The diffusivity of water were than derived from water content data. The results showed that the higher the soaking temperature, the faster the change of dimensions, weight, and water content. The coefficient of water diffusion of kidney bean at soaking temperatures: 28 oC, 35 oC, 40 oC, 45 oC, and 50 oC, was 12,91 x 10-11 m2/s; 6,42 x 10-11 m2/s; 25,64 x 10-11 m2/s; 60,20 x 10-11 m2/s and 48,24 x 10-11 m2/s, respectively.Â It showed that the higher temperature, the faster the water diffusion rate and it follows exponential equation with the coefficient of determination, R2 = 0,643. Keywords: Kidney bean, soaking temperature, coefficient of water diffusion, physical properties

ANALISIS SPEKTRUM UV-VIS UNTUK MENGUJI KEMURNIAN KOPI LUWAK Sri Waluyo; Fipit Novi Handayani; Diding Suhandy; Winda Rahmawati; Cicih Sugianti; Meinilwita Yulia
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 6, No 2 (2017)
Publisher : The University of Lampung

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Penelitian ini bertujuan untuk membangun dan menguji model untuk identifikasi kemurnian kopi asli Luwak. Bahan yang digunakan adalah 100% kopi Luwak dan kopi Luwak yang dicampur dengan kopi Robusta dengan perbandingan pencampuran 90%: 10%, 80%: 20%, 70%: 30%, 60%: 40%, dan 50%: 50%. Pada penelitian ini model dibangun dan diprediksi menggunakan metode soft independent modeling of class analogy (SIMCA) dengan taraf signifikan10%, kemudian menghitung tingkat akurasi (AC), sensitivitas (S), spesifisitas (SP), dan false alarm rate (FP) menggunakan perhitungan confusion matrix. Dari proses Hotelling T2 elipse 95 sampel, diperoleh dua model untuk mengelompokkan kopi Luwak asli (SLWK) dan kopi campuran Luwak Robusta (SLWKR). Dari uji model didapat nilai akurasi (AC) 48,48%, sensitivitas (S) 50,00%, spesifisitas (SP) 33,33%, dan false alarm rate (FP) 66,67%.Kata Kunci : Kopi Luwak; Robusta; UV-vis spectroscopy; Pemodelan; Validasi

Prediction of Self Life of Kemplang Crackers Packaged in Polypropylene Plastick with Thickneses Astrid Wulandari; Sri Waluyo; Dwi Dian Novita
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 2, No 2 (2013)
Publisher : The University of Lampung

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Kemplang crackers are classified as absortive food. This may cause kemplang crackers are easly soggy and their texture become tougher and chewier. The objective of this research was to predict the self life of packaged kemplang crackers placed in different storage conditions. Kemplang crackers were stored in a polypropylene (PP) plastic with three different thicknesses : 0,3 mm, 0,5 mm and 0,7 mm and relative humidity (RH) of about 63% and about 53%. The packages were stored in ambient temperature. The results showed that kemplang crackers stored at lower RH and thicker plastick have a longer self life. The self life of kemplang cracker stored in PP plastic with thickness of 0,3 mm, 0,5 mm, and 0,7 mm and in ambient RH were 12 days, 14 days, and 33 days, respectively, while the self life of kemplang cracker storaged in PP plastic with thickness of 0,3 mm, 0,5 mm, and 0,7 mm and RH of about 53% were ranging from 185 days to more than >365 days. Keywords: Kemplang Crackers, Polypropylene Plastic, Self -life

UJI KINERJA PROTOTIPE ALAT PENGIRAT BAMBU Fauzan .; Tamrin .; Sri Waluyo
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 3, No 1 (2014)
Publisher : The University of Lampung

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Bamboo is becoming versatile plant for rural communities for many utilities, such as house, bridge, ladder, Geribik, fence, handicraft, etc. Now, Indonesian bamboo craftsmen are still using a manually method to rod bamboo. So that it is needed to make a tool that enhances efficiency and quality of bamboo strip as raw material to produce bamboo-made handicrafts. This study aimed to make a tool that enhances efficiency and quality of bamboo strip as raw material to produce bamboo-made handicrafts.The steps are as follows one bar of bamboo was cutted with 0.5 m length and 0,15 width. Then, the outer skin was peeled before it was sliced into some strips. Next, the strips of bamboo was feeded to a channel and booster unit in a spinned condition. Each tests were repeated 3 times i.e. 5 samples in wet condition and 5 samples in dry condition. Part of tested bamboo was classified into 3 types i.e. culm, middle and end. Then, percentage of rodent bamboo, and the period of split process.The performance test of splitter bamboo tool for wet bamboo found that the percentage of bamboo culm is 33,33 %, middle 20 % and end 26,67%. Based on the percentage, Culm has bigger percentage than others due to the culm has a more suitable thickness with the knife from the splitter tool. Whereas the dry of the sample found that the percentage of culm, middle is similar about 33,33 % and the end part of the bamboo has percentage around 20 %. This condition exists since the dry sample of the bamboo has a more stabilized texture than the wet one due to still high water content. Keywords: Testing, splitter, bamboo

Dissolved Phosphorus Of Phosphate Stones With Ultrasonic Waves As An Efforts Rahmat Ibnu Mas'ud; Sugeng Triyono; Sri Waluyo; Tamrin -
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 1, No 1 (2012)
Publisher : The University of Lampung

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Fertilizer is a material that can add nutrients to soil. Phosphate is one of essential elements of fertilizer for plants. Ultrasonic waves can potentially be used as a method to dissolve phosphorus from phosphate stone, by means of immersion in water and gived of ultrasonic waves. The aim of this study was to analyze the P content from phosphate stone that was dissolved in water and the excited by ultrasonic waves. The tests were the concentration of phosphate in water of 30, 60, and 90%, and the duration of ultrasonic wave (60 kHz) of 15, 30, and 60 minutes. The parameters observed were the levels of dissolved P (P2O5), pH value, and specific energy. The samples were analyzed, namely liquid and solid samples were separated after ultrasonic vibrate. The results of the analysis of the highest levels of soluble P from liquid samples are at 90% concentration, treatment time-vibrate 15 minutes, that is equal to 0.0415 mg/l, whereas the treatment of solid samples at concentrations of 60% , within 15 minutes, amounting to 1.38%. The measurement results show the solution pH is neutral phosphate after vibrated tend to alkaline with pH values between 7 – 8. Sample concentration of 60% treatment, 15 minutes and 90% concentration, treatment time of 15 minutes is the most efficient, because it uses only the smallest specific energy is 0.15 J/mg and 0.1 J/mg, can produce high levels of dissolved P. Keywords: fertilizer, phosphate stones, ultrasonic, P dissolved.

EFFECT OF TEMPERATURE AND CONCENTRATION ON THE ABSORPTION OF SUGAR SOLUTION IN BENGKUANG (Pachyrrhizus erosus) Malyan Afri Arlita; Sri Waluyo; Warji .
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 2, No 2 (2013)
Publisher : The University of Lampung

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

UJI KINERJA PROTOTIPE ALAT PEMBERSIH GABAH Yadi Sudirman; Sri Waluyo; Warji .
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 3, No 1 (2014)
Publisher : The University of Lampung

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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.

STUDI PENGGUNAAN UV-VIS SPECTROSCOPY UNTUK IDENTIFIKASI CAMPURAN KOPI LUWAK DENGAN KOPI ARABIKA Cicih Sugianti; Novi Apratiwi; Diding Suhandy; Mareli Telaumbanua; Sri Waluyo; Meinilwita Yulia
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 5, No 3 (2016)
Publisher : The University of Lampung

This study aims to identify the authentication of civet coffee using a Soft independent modeling of class analogy(SIMCA) method and principal component analysis (PCA). The test carried out on the coffee powder measuring0.297 millimeters (mesh 50). Comparison of blend that is samples 1- 50 each 1 g of pure civet coffee, samples51- 60 each 0.9 g civet coffee and 0.1 g arabica coffee, samples 61-70 each 0.8 g civet coffee and 0.2 g arabicacoffee, samples 71-80 each 0.7 g civet coffee and 0.3 g arabica coffee, samples 81-90 each 0.6 g civet coffee and0.4 g arabica coffee, samples 90-100 each 0.5 g civet coffee and 0.5 g arabica coffee. The classification resultsshow SIMCA and PCA methods are able to identify civet coffee mixture. PC 1 explains 75% the variance of dataand PC2 explains 17% the variance of data. Values obtained on SIMCA classification are specificity 76%,sensitivity of 84% and accuracy of 80%, with a value error of 23%.Keywords: Arabica coffee,civet coffee, PCA, SIMCA, UV-Vis spectroscopy.

STUDY ON GC-MS PROFILE OF FUELS PRODUCED FROM PLASTIC WASTE CONVERSION VIA THREE-CONDENSER PYROLYSIS REACTOR Syaiful Bahri; Yuli Ambarwati; Yul Martin; Lina Marlina; Sri Waluyo
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 10, No 1 (2021): Maret
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v10i1.33-40

The problem of plastic waste is very flourished in the current era of modern life. In this study, a three-condenser pyrolysis reactor was applied to obtain fuels in the form of oil#1, oil#2, and oil#3 from plastic waste. Gas Chromatography-Mass Spectroscopy (GC-MS) technique was carried out to analyze the fuel for profiling study. Characterization using GC-MS indicated the domination of hydrocarbon compounds was found oil#1. The existence of hydrocarbon compounds from oil#2 and oil#3 was displayed by chromatogram and MS database from Library Wiley 7.LIB. Meanwhile, alcohol, ether, and fatty acid were detected from oil#1 based on the chromatogram and MS database. Therefore, the samples were categorized as fuel. The result of this study corresponded to the concept of pyrolysis and be able to be implemented as an alternative energy source. Keywords: fuel, GC-MS profile, plastic waste, three-condenser pyrolysis reactor

Co-Authors Agus Haryanto Agus Haryanto Agus Setiawan Aidil Fitriansyah Aleksander Purba Alvin Restian Ambarwati, Yuli Anak Agung Gede Sugianthara Andrie Septiawan Anisa Narullita Ansori, Ardy Setya Aris Candra Prihantoro Arivina Ratih Yulihar Taher Astri Magdalena Astrid Wulandari Atmaningsih, Tri Atsani Wulansari Aziza Putri Utami Budianto Lanya Cicih Sugianti Cicih Sugianti Cicih Sugianti Cicih Sugianti Damayanti, Eko Regita Diding Suhandy Dwi Dian Novita Dwi Nugroho Eddy Ristanto Erlina Erlina Esti Harpeni Fatkhurrochman, Fatkhurrochman Fauzan . Fipit Novi Handayani Fitria Saftarina Gusri Akhyar Ibrahim handayani, riska dwi Herry Wardono Hilmans Oktaviansyah Ibrahim, Gusri Ahyar Ihsanti Dwi Rahayu Ika Kustiani Ina Sholihah Widiati, Ina Sholihah Indriyani, Yaktiworo Irza Sukma Irza Sukmana Kanafi Kapti Kapti, Kapti Kuncoro, Sapto Kusumiyati Lina Marlina Malyan Afri Arlita Mareli Telaumbanua Maria Erna Kustyawati Maria Erna Kustyawati Mayasari, Diana Meinilwita Yulia Meinilwita Yulia Mohamad Amin Moneyzar Usman Muhammad Abdul Muin Nanik Agustina Nikita Permatahati Notiragayu, Notiragayu Novalia Novalia Novi Apratiwi Novita Carolia Nur Arifah, Fatimah Nur Efendi NUR EFENDI Nyi Ayu Ika Pratiwi Oktarina, Rasmi Zakiah Pangestu, Retama Agung Rahmat Ibnu Mas'ud Rara Diantari Ratih Laily Nurjanah Ribut Eko Wahyono RIBUT SUGIHARTO Rico Wahyu Prabowo Riri Iriani Sapto Kuncoro Sari Anton Siti Suharyatun Siti Suharyatun, Siti Sri Setyani, Sri Suci Ristiyana Sugeng Triyono Suharno Suharno Supono Supono SYAIFUL BAHRI Syaiful Bahri Syihabudin, Syihabudin Tamrin Tamrin Tamrin, Tamrin Tiara Nirmala Tohari Tohari Tri Wahyu Saputra Tri Yusnanto Utama, WInda Trijayanti Wahyu Priyoatmoko Wardiyanto Wardiyanto Warji Warji Winda Rahmawati Winda Rahmawati Yadi Sudirman Yuanita Kusuma Pratiwi Yudha Trinoegraha Adiputra Yul Martin Yuli Ambarwati Yulia, Meinilwita

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