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Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering)
Published by Universitas Lampung
ISSN : 2302 559X     EISSN : 2549 0818     DOI : -
Core Subject : Agriculture, Engineering,
Agriculture, Biological Sciences & Forestry Engineering
Jurnal Teknik Pertanian Lampung or Journal of Agricultural Engineering (JTEP-L) is a peer-reviewed open-access journal. The journal invites scientists and engineers throughout the world to exchange and disseminate theoretical and practice-oriented researches in the whole aspect of Agricultural Enginering including but not limited to Agricultural Mechanization, Irrigation, Soil and Water Engineering, Postharvest Technology, Renewable Energy, Farm Structure, and related fields. The first issue was published in October 2012 by Department of Agricultural Engineering, Faculty of Agriculture, University of Lampung. Jurnal Teknik Pertanian Lampung has ISSN number 2302 - 559X for print edition on October 10, 2012 then 2549 - 0818 for online edition on January 10, 2017. Jurnal Teknik Pertanian Lampung is issued periodically four times a year in March, June, September, and December. Jurnal Teknik Pertanian Lampung has been indexed by Google Scholar, Crossref, Directory Open Access Journals (DOAJ), and CABI. Since Volume 5 Issue 1 (2016) Jurnal Teknik Pertanian Lampung has been accredited as SINTA 3 by Directorate General of Higher Education (DIKTI). Starting Volume 10 Issue 3 (2021) the journal received accreditation SINTA 2.
Arjuna Subject : -
Articles 1,077 Documents
 89   90   91   92   93 
Developing Sustainable Competitive Advantage: The Role of Dynamic Capability and Innovation Performance in Excelsa Coffee Bean Industry Artika, Siti; Toiba, Hery; Andriani, Dwi Retno
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 13 No. 4 (2024): December 2024
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v13i4.1410-1421

Abstract

This study examines the influence of sensing ability, seizing ability, reconfiguring capability, and innovation performance on sustainable competitive advantage (SCA) of the Excelsa Coffee Bean Processing Industry in Bojonegoro. Data was collected through questionnaires that have been tested for validity and reliability. The data analysis uses Structural Equation Modeling (SEM) with SmartPLS software. The results show that these four variables have a positive and significant influence on SCA. Sensing ability plays a role in detecting market changes, while seizing ability allows companies to take advantage of existing opportunities. Reconfiguring capability helps companies adjust resources to stay competitive, and innovation performance is a key factor in creating new ideas that are relevant to the market. The study also found that innovation performance mediates the influence of sensing ability and seizing ability on SCA, making it a key catalyst in turning market potential into competitive advantage. This finding has important implications for the industry, namely the need to improve sensing, seizing, reconfiguring, and innovation performance. Stakeholders, such as local governments and supporting institutions, are also expected to play a role in helping the industry through policies that support this capacity building. Keywords: Performance innovation, Reconfiguring capabilities, Seizing ability, Sensing ability, Sustainable competitive advantage.
Optimization of used engine oil Furnace Design with Initial Heater Sahbudin, Muhammad; Hermawan, Wawan; Sutejo, Agus
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 13 No. 4 (2024): December 2024
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v13i4.1237-1248

Abstract

Used engine oil is a waste from various types of machinery that has potential as an alternative fuel. The viscous characteristics of used engine oil require viscosity adjustment to be utilized as fuel. Nowadays used engine oil burners are generally using an external heater as an initial preheater, which causes the thermal efficiency decreased. The aims of this study are optimizing the design of the used engine oil burner by adding an initial heater and to find the optimum operating conditions of the burner to improve thermal. The initial heater is a spiral-shaped heat exchanger around the flame inside the burner, using its heat to decrease the viscous of used engine oil, so the used engine oil can be used as burner fuel. This study is varying the combustion air flowrate at 3.2×10-3 kg/s, 4.6×10-3 kg/s, and 6.4×10-3 kg/s and fuel rates of 2.1×10-4 kg/s, 3.1×10-4 kg/s, and 4.3×10-4 kg/s so the best performance of the burner will be observed. The results were obtained the best burner performance air flowrate of 4.6×10-3 kg/s and fuel flow rate of 4.3×10-4 kg/s, producing flue gas heat of 544°C, useful energy of 2.69 kW, and a resulting thermal efficiency of 59.54%. Keywords: Burner, Design optimization, Initial heater, Used engine oil, Viscosity.
Automatic Tomato Plant Watering System Using Fuzzy Logic Control with Telegram-Based Monitoring System Purwiyanti, Sri; Murdika, Umi; Pratama, Pinkga Nata; Repelianto, Ageng Sadnowo
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 13 No. 3 (2024): September 2024
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v13i3.966-977

Abstract

In tomato plants, one of the decisive factors is the soil humidity factor, where the optimal humidity for tomato plants is 80%. For this reason, the tomato planting process requires regular and measurable irrigation or watering. This research aims to create an automatic watering system for tomato plants with soil humidity and pH detection. In this system, Fuzzy logic is used as the control method and this system is also equipped with a monitoring system using the telegram application. In this system, the humidity sensor and soil pH sensor will provide information about soil conditions and forward the electrical signal to the NodeMcu ESP32 microprocessor, as the control center and signal processing. This input signal is then processed using Fuzzy logic control to decide whether the system will activate the relay on the water pump. If the humidity value is <60%, the pump will activate and sprinkle water until the humidity reaches 80%. The measurement results of soil humidity, soil ph, and pump relay conditions will be sent via Internet of Things technology so that they can be monitored remotely using the Telegram application. From the research results, it is found that the system can work as expected with an accuracy value of 100% with a delay time for sending data to Telegram of 14.1 seconds. Keywords: Fuzzy logic, Humidity, NodeMcu, Sensor, Soil pH.
Theoretical Study of Shell-and-Tube Heat Exchanger Effectiveness on Batch Drying of Sawdust Utilizing Waste Heat from Organic Rankine Cycle Yahdi, M. Arief; Hartulistiyoso, Edy; Yulianto, Muhamad
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 14 No. 1 (2025): February 2025
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v14i1.71-82

Abstract

Steam power plant has flue gas that are generally discharged into environment. The exhaust gases from internal combustion contain thermal energy that can be utilized for drying processes, which can enhance the energy efficiency of the Organic Rankine Cycle (ORC) system. This research focuses on the use of waste heat for drying applications through heat exchangers. The objective of this work is to study the performance of shell-and-tube type heat exchanger in utilizing waste heat from an ORC system for drying applications. Experimental data was obtained by varying the air velocity of the dryer to validate the numerical simulations. The results showed that increasing air velocity in the heat exchanger caused a decrease in heat exchanger outlet temperature, water vapor mass, and heat exchanger effectiveness. The decrease in these parameters reduces heat transfer required for drying, so water mass rate of material decreases and drying time gets longer. Validation of simulation and experiment data for outlet heat exchanger temperature was determined by MAPE value of less than 20% which means good prediction model. Keywords: Air velocity, Drying, Effectiveness heat exchanger, Exhaust gas, Heat exchanger.
Physicochemical and Sensory Characteristics of Noni (Morinda citrifolia) Juice Drink with the Addition of Ginger and Lemongrass Fauziah, Riska Rian; Nisa, Shinta Zahrotun; Jayus, Jayus
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 14 No. 2 (2025): April 2025
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v14i2.473-482

Abstract

Noni (Morinda citrifolia) contains bioactive compounds, but it has an unpleasant odor caused by caproic acid. Due to essential oil compounds, ginger and lemongrass can be used to reduce the unpleasant aroma of noni fruit. This research aims to evaluate the effect of ginger and lemongrass with varying concentrations of noni juice on physicochemical and sensory characteristics noni drink. The study employed a completely randomized design with six treatments and four replications. Physicochemical data were analyzed using ANOVA and Duncan's post hoc test, while sensory data were analyzed using the Chi-Square test. Results indicated that the type of ginger and concentration of noni juice significantly influenced the chemical characteristics. A concentration of 10 ml of noni juice affected the physical and sensory properties of noni juice beverage, but this was not observed at a concentration of 20 ml. The best formula resulted from treatment with a concentration of 10 ml of noni juice and the addition of 10 ml of lemongrass, with an overall score of 4.13 (liked). This was attributed to the flavonoid content of 0.290 mgQE/ml, polyphenol content of 0.3500 mgGAE/ml, vitamin C content of 0.114 mg/ml, antioxidant activity of 17.65ml, as well as satisfactory scores for taste, aroma, and aftertaste. Keywords: Caproic acid, Drink, Noni, Spice.
The Effect of KNO3 Fertilizer Dosage and Paclobutrazol Concentration on The Growth and Yield of Long Bean (Vigna sinensis L.) Aringgani, Sintha Dayu; Djarwatiningsih, Djarwatiningsih; Sulistyono, Agus
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 14 No. 1 (2025): February 2025
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v14i1.273-282

Abstract

Long bean production has decreased in Indonesia due to uncertain seasonal factors, such as long dry seasons and short rainy seasons. Long bean production has decreased due to inappropriate and optimal cultivation techniques. Several efforts can be made to overcome the problem of decreasing long bean productivity by fertilizing and applying growth regulators. The aim of this research is to understand the combined effect of KNO₃ fertilizer doses and paclobutrazol concentrations on the growth and yield of long bean plants. Thise research was conducted in Ketawang Village, Nganjuk, East Java. The research was a factorial experiment with Split Plot Design consisted of two treatment levels, namely KNO₃ fertilizer dose (0 g/plant, 8 g/plant, 10 g/plant and 12 g/plant) and paclobutrazol concentration (0 ppm, 150 ppm, 175 ppm and 200 ppm). The combination of 10 g/plant KNO₃ + 150 ppm paclobutrazol influences the growth and yield of long bean plants, however the application of KNO₃ fertilizer alone has no effect on the growth and yield of long bean plants. Keywords: Giberelin, Growth regulator, Harvest, Nutrient, Retardant.
Effect of Cold Storage Duration on the Quality of Super Red (Hylocerus costaricensis) and White (Hylocerus undatus) Dragon Fruits Latif, Fahmi Nur Aida; Nurchayati, Yulita; Hastuti, Endah Dwi
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 14 No. 1 (2025): February 2025
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v14i1.39-48

Abstract

Postharvest storage is carried out to control the metabolic rate so the quality of fruits can be maintained properly until it reaches the costumers. Cold storage can reduce metabolic reactions, such as respiration and transpiration. However, storing too long in cold temperatures can cause the quality of the fruit to deteriorate. Each type of dragon fruit has different chemical contents that will affect the quality of fruits after storage. This study aims to determine the effect of the type of dragon fruit, cold storage duration, and interaction between the two treatments. Both type of dragon fruit are packed in PP plastic and then stored at 10°C. Observation were made at different storage durations. This study used RAL, with the first being super red and white dragon fruits. The second factor was storage duration of 0, 7, 14, and 21 days. Data were analyzed using ANOVA and continued with DMRT if it had a significant effect. The result of the study showed that the treatment of fruit type had significant effect on antioxidant activity, vitamin C content, and total sugar level. Storage duration treatment had significant effect on antioxidant activity and vitamin C content. Keywords: Antioxidant activity, Cold storage, Dragon fruit, Post-harvest, Vitamin c.
ORC Performance Study with R32 and R134a Using Biomass as an Energy Source Al Azhari, Lalu Muh Fathul Aziz; Yulianto, Muhamad; Hartulistiyoso, Edy
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 14 No. 1 (2025): February 2025
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v14i1.118-129

Abstract

The use of fossil energy as the main source of primary energy reached 84.7%, with electricity consumption in Indonesia of 1,173 kWh/capita, dominated by fossil fuels (67.21%). The decline in fossil energy reserves requires the development of alternative technologies such as the Organic Rankine Cycle (ORC) that can operate at low to medium temperatures (60°C-200°C). This research was carried out in 2 ways, experiment, and simulation. Experiments were carried out to determine the temperature that can be generated in the evaporator of ORC from the flue gas flow from burning biomass. Simulations were carried out to evaluate the performance of the ORC cycle with working fluids R32 and R134a and the contribution of CO2 to the environment using the LCCP (Life Cycle Climate Performance) method. The analysis involves measuring the outlet temperature of the evaporator. The research results show that the validation for predicting the output temperature of the ORC evaporator is very good with a Mean Absolute Percentage Error (MAPE) value of <10%. Simulation results show that in this study, R32 performed better than R134a, with a net power of 0.13 kW at a temperature of 86.83℃. LCCP analysis results show that R32 has lower direct emissions than R134a, with better LCCP values. Keywords: LCCP, Organic rankine cycle, R134a, R32, Simulation, Work output.
Flame Behavior During the Combustion of Premixed Kapok Oil Influenced by Oxygen and Magnetic Field Perdana, Dony; Rohman, Muhamad Nur; Rosidin, Mochammad Khoirul; Muhaji, Muhaji
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 14 No. 1 (2025): February 2025
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v14i1.92-98

Abstract

This study aimed to determine effect of oxygen enrichment and magnetic field direction on the flame behavior kapok oil combustion. Experiment was carried out to obtain flame evolution, temperature and height. Kapok oil (600 ml) was put in the boiler, and heated to 300°C. A burner chamber is placed for the reaction between kapok oil vapor with air from compressor and oxygen. Two permanent magnets of neodymium nickel grade N52 with intensity 1.1 Tesla were placed on side of burner tip. Results showed the magnetic field produce more transparent, slimmer flames with highest temperature of 679°C, lowest flames height of 5 mm. Magnetic fields produce a Lorentz force that breaks the fuel chemical chain and creates magnetic pulses in the flames. Oxygen contained in air around the burner coupled with oxygen enrichment create excessive oxidizing gas to separate and release electrons. Excessive oxygen results in a higher flame temperature due to faster combustion reaction. The magnetic fields around flames induces flow air which magnetically cause heat transfer around the flame, resulted variable flame height. This combustion produces different flame evolution, temperature, and height. Keywords: Flames behavior, Flames colour, Kapok oil, Magnetic field, Premixed combustion.
Analysis of Ultra Fine Bubble Addition on Biodiesel Fuel to Reduce Emission of Two Wheel Tractors Diesel Engine Farafisha, Hanifa; Herodian, Sam; Sugiarto, Anto Tri; Anggarani, Riesta; Pitoyo, Joko; Pramudito, Yogi
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 14 No. 1 (2025): February 2025
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v14i1.296-308

Abstract

Diesel engines are known as high efficiency engines and are used in public transportation and agricultural sector. The exhaust gas produced by diesel engines is dangerous for human health. Ultra Fine Bubble (UFB) technology which is currently being developed is an emission reduction alternative that can enrich oxygen in fuel and has the potential to reduce emissions. This research was carried out to apply UFB technology to a variety of fuels and compare the emission results. This research method is data collection based on experimental tests. The types of fuel used in this research are biodiesel and biodiesel-diesel mixture. The research procedure starts from instrument preparation, fuel inflation which produces UFB fuel, fuel characteristics, instrument performance testing and data processing. The characteristic testing method follows the American Standard Testing and Materials (ASTM) and performance testing follows the ISO/IEC 17025:2017 standard. The research results show that fuel treated with ultra-fine bubbles can reduce exhaust emissions compared to fuel without UFB. CO content decreased by 608 parts per million (ppm) in the biodiesel-diesel blend and 306 ppm in biodiesel with UFB. The exhaust gas temperature becomes stable when the fuel contains bubbles and reduces NO and NOx content in emissions. Keywords: Biodiesel, Diesel engine, Fuel, Ultra fine bubble

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