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Analysis of potential evapotranspiration model using global climate data in Makassar city

AIP Conference Proceedings 2023年第1期2596卷

作者： Samsuar Sitti Nur Faridah Husnul Mubarak Nunik Lestari Agricultural Engineering Department Faculty of Agriculture Universitas Hasanuddin Makassar. Indonesia Agricultural Technology Education Study Program Faculty of Engineering Universitas Negeri Makassar Makassar Indonesia

Global climate change has demanded us to optimize natural resources, especially water resources in agriculture. Water requirement for developing agricultural commodities is influenced by weather conditions. Calculation of the value of potential evapotranspiration (ETp) is necessary to estimate plants' water requirements in an area. Several models for calculating ETp are more straightforward and require fewer input data. However, the model's accuracy is still relatively low because it is not following local climatic conditions. The purpose of this study is to test several potential evapotranspiration models to obtain a simpler ETp model that requires less data input and follows the standards issued by FAO. The ETp model analysis in this study uses the Blaney-Criddle, Hargraves, Remanenko, Kharuffa, Turc, Penman model, which is then compared with the Penman-Monteith ETp model, which is the standard for measuring ETp by FAO. The results showed that solar radiation had the best linear relationship among other climatic parameters in calculating the FAO ETp value. The relationship between weather parameters and the ETp value of Penman-Monteith shows that temperature, solar radiation, and wind speed are positively correlated with the ETp value. In contrast, relative humidity is negatively correlated with the ETp value. ETp analysis on several models shows that the Turc model is the closest to the FAO ETp model with the highest coefficient of determination and the lowest RMSE value compared to other models and has input parameters of temperature and solar radiation. Meanwhile, the Blaney-Criddle, Kahruffa, and Remanenko model is not recommended to analyze the ETp value in Makassar because it has the lowest coefficient of determination compared to other models.

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Analog rice production using granulation, hot extrusion, and cold extrusion methods: An overview

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AIP Conference Proceedings 2023年第1期2667卷

作者： Heny Kusumayanti Siswo Sumardiono Bakti Jos 1Doctoral Program of Chemical Engineering Faculty of Engineering Universitas Diponegoro Tembalang Semarang Central Java 50275 Indonesia 2Department of Chemical Engineering Faculty of Engineering Universitas Diponegoro Tembalang Semarang Central Java 50275 Indonesia

Indonesia has fertile soil that enable abundant varieties of plants to grow including paddy (Oryza sativa L) which contains nutrients needed mainly by human body, i.e. milled rice contains 78.9% carbohydrate, 6.8% protein, 0.7% fat, and others of 0.6%. Paddy plants will produce paddy rice, i.e. paddy rice grains which have been separated from the husk. That peeled paddy grain is commonly called paddy rice or rice. Rice is a staple food for majority of people in Indonesia. The increase in rice production cannot actually correspond the rapidly increasing Indonesian population. Therefore, it is necessary to diversify non-rice food from other carbohydrate sources by conducting many alternative processes. This study attempted to investigate some methods to produce analog rice. Furthermore, this paper review aimed to find out the various processes of analog rice production and the best ingredient to make good quality analog rice. Analog rice is rice made of non-paddy plants, e.g. tubers, cereal, and other materials which may use granulation or extrusion (cold and hot process) methods. In granulation process, analog rice is produced in the form of granules. Starch flour and water produced by artificial rice are not in the form of grains that resembles pearl porridge. Meanwhile, extrusion is a method for producing analog oval-shaped rice which resembles paddy rice. In addition, analog rice produced from cassava flour and protein of fermented soybean cake flour using cold extrusion method. Results in the best composition with proximate analysis results of 73.53% carbohydrate, 18.97% protein, 3.19% fat, 1.87% water content, 2.44% ash content, and 0.15% food fiber. The absorption capacity of analog rice water in this study was 121.8%, and the other physical analysis was the bulk density of 0.59633%. Moreover, the time required to cook the analog rice produces was 7.1 minutes.

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Microwaves-assisted extraction of bioactive eucalyptus leaves (eucalyptus globulus)

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AIP Conference Proceedings 2024年第1期3082卷

作者： Nurhazanah Fatmawati Husni Husin Ahmadi Fahrizal Nasution Department of Chemical Engineering Universitas Syiah Kuala Banda Aceh 23111 Indonesia Doctoral Program School of Engineering Universitas Syiah Kuala Banda Aceh 23111 Indonesia Reaction Engineering and Catalysis Laboratory Department of Chemical Engineering Faculty of Engineering Universitas Syiah Kuala Banda Aceh 23111 Indonesia

In this study, a microwave-assisted extraction (MAE) technique was used to extract the essential oil from eucalyptus leaves. The MAE process was carried out to assess the effect of microwaves on the production of bioactive components and properties of eucalyptus leaf essential oil on several parameters, including mass of eucalyptus leaves (20, 30, 40 grams), microwave power (180, 300, 450, 600 watts). and extraction time of 60 minutes. The highest yield of eucalyptus essential oil was obtained at 1.92% at the process parameters of 30 g of eucalyptus leaves, 450 watts of microwave power, and 30 minutes of extraction time. The ATR-FTIR spectrum of eucalyptus leaf oil showed that alkane compounds were characterized by strong C-H bonds. GC-MS analysis showed that the highest content of the product was 70.63% cineol (bioactive content). The results of the analysis of physical properties by measuring the specific gravity of the oil is 0.903 and the determination of the refractive index is 1.453 nD at room temperature of 30°C. Its characterization showed in the range with SNI standard.

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Maintenance Management of Welding engineering Workshops in Vocational High Schools Inspecial Region of Yogyakarta 1

Maintenance Management of Welding Engineering Workshops in V...

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1st International Conference on Vocational Education of Mechanical and Automotive Technology, ICOVEMAT 2018

作者： Jarwono, Tri Ardian, Aan Mechanical Engineering Education Study Program Faculty of Engineering Yogyakarta State University Indonesia

This study aimed at investigating the maintenance management of welding engineering workshops and factors affecting the damage of welding equipment in vocational high schools located in Special Region of Yogyakarta. The study employed quantitative descriptivedesign. It was conducted at vocational high schools SMKN 1 Sedayu, SMKN 2 Pengasih, SMK Muhammadiyah 2 Wates, and SMKN 1 Pundong. The respondents were heads of workshops, teachers of welding engineering subject, workshop technicians, and students. The data were collected through survey, observation, and interview. The quantitative descriptive technique was employed to analyze the collected data. The results of the study show that the maintenance management of welding engineering workshops in some VHS in Yogyakarta is Very Gooddespitesome problemsin the maintenance procedure. The factors causing the equipment damage are the unscheduled maintenance procedure, absence of inventory lists, lack of technicians, improper use of workshop equipment, and the limited amount of maintenance budget. © Published under licence by IOP Publishing Ltd.

关键词： Maintenance

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The effect of sea water soak on asphalt porous characteristics with and without waste of rubber tire waste as an asphalt addictive 2

The effect of sea water soak on asphalt porous characteristi...

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2nd International Conference on Green Civil and Environmental engineering, GCEE 2019

作者： Mawarni, O.S.T. Fauziah, M. Civil Engineering Study Program Faculty of Civil Engineering and Planning Universitas Islam Indonesia

The use of rubber tire scraded in the developement of porous asphalt technology as a part of flexible pavement aims to minimize the adverse effects of transportation facilities. The use of rubber tire scraded as an asphalt modifier in the pavement can provide several benefits, including reducing reflective cracking on overlays, reducing maintenance cost, increaseing resistance to new pavement cracking and rutting, increasing skid resistance an pavement age. This paper presents laboratory investigation on the effect of seawater immersion on porous asphalt performance using rubber tire scraded. Method use in laboratory investigation is based on AAPA 2004 and Bina Marga 2010. The results showed the permeability all types of mixture indicator "moderate drainage". The results of testing the Marshall characteristics showed a decrease in the value of stability, flow, and MQ in the porous asphalt mixture with Pen 60/70 asphalt and rubber asphalt as the duration of sea water immersion increased. The porous asphalt mixture using Pen 60/70 asphalt and rubber asphalt has Index of Retained Strength values which tend to decrease with increasing sea water immersion duration. Indirect Tensile Stength test results due to seawater submersion indicate a decrease in ITS value in porous asphalt mixtures with Pen 60/70 asphalt and rubber asphalt. The Cantabro test results showed an increase along with the increasing duration of seawater immersion. © Published under licence by IOP Publishing Ltd.

关键词： Tires

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Developing a Manual Arc Welding Job Sheet for the Basic Welding Technique Subject 1

Developing a Manual Arc Welding Job Sheet for the Basic Weld...

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1st International Conference on Vocational Education of Mechanical and Automotive Technology, ICOVEMAT 2018

作者： Adityawan, Galih Dwi Djatmiko, Riswan Mechanical Engineering Education Study Program Faculty of Engineering Yogyakarta State University Indonesia

The study aims to describe (1) the development stages of the manual arc welding job sheet and (2) its validity. It is a Research and Development (R & D) of which the data were collected by means of non-test instruments, namely the closed-ended questionnaires with the 5-scale responses. The data were collected from the three research participants acting as the material and media experts,namely two lecturers in the Mechanical engineering Education study program, faculty of engineering (FE), Yogyakarta State University (YSU), and a teacher of the Basic Welding Technique subject. The job sheet development stages were adapted from Thiagarajan's model, namely the Four-D model covering the definition, design, development, and dissemination. Data were analyzed quantitatively by means of the descriptive statistics. The results of the material evaluation by the material expert I prove that the job sheet is categorized as Appropriate (with the total score of 145 or 82.9%) and Very Appropriate based on the material expert II with the total score of 153 (87.4%). Besides, in terms of the media, the job sheet is Appropriate based on the media expert I (with the total score of 207 or 82.8%) and Very Appropriate based on the media expert II (with the total score of 215 or 84.4%). © Published under licence by IOP Publishing Ltd.

关键词： Surveys

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Faults Identification of Induction Motor Based On Vibration Using Backpropagation Neural Network

Faults Identification of Induction Motor Based On Vibration ...

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Smart Technology and Applications (ICoSTA), 2020 International Conference on

作者： Kuspijani Kuspijani Richa Watiasih Prihastono Prihastono Electrical Engineering Study Program Engineering Faculty Bhayangkara Surabaya University Surabaya Indonesia

ISBN: (数字)9781728130835

ISBN: (纸本)9781728130842

Vibration analysis is very important in predictive maintenance in the industry today. In this paper, has designed a vibration detection system that can identify the condition of the induction motor by online. Induction motor vibration data is read from two vibration sensors, accelerometer1 and accelerometer2, displayed using ATMEGA16 microcontroller and can directly identify the condition of the induction motor by using artificial intelligence-based analysis that is Backpropagation-Neural Network (B-NN). After testing, the system managed to perform fault identification induction motor with the rank of success of 95 percent.

关键词： induction motor vibration accelerometer Backpropagation-Neural Network (B-NN) induction motors Vibration accelerometers Predictive maintenance

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Students' Competences in Practicums of Various Competencies in Machining engineering 1

Students' Competences in Practicums of Various Competencies ...

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1st International Conference on Vocational Education of Mechanical and Automotive Technology, ICOVEMAT 2018

作者： Ardhian Syah, Dhany Nuryanto, Apri Electrical Engineering Education Study Program Faculty of Engineering Yogyakarta State University Indonesia

This study aimed at investigating productive practicums of various competencies and the competences of Machining engineering department students of Muhammadiyah 1 Bantul Vocational High School. It is a descriptive study which employed both quantitative and qualitative research designs. The practicums of various competencies consisted of seven stages led by two teachers. Those stages are opening, presenting the introductory theory, demonstrating, conducting productive practicums of various competencies, evaluating, giving feedback, and closing. Based on the data analysis, the percentage of students' response is 70%, and it is categorized as good. The average score of the students' competences is 81.67, and it is also categorized as good. Finally, the percentage of students' activity aspect is 90%, and it is also categorized as very good. © Published under licence by IOP Publishing Ltd.

关键词： Students

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Comparison heuristics method for solving two echelon vehicle routing problem

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AIP Conference Proceedings 2024年第1期3029卷

作者： Muhammad Khahfi Zuhanda Saib Suwilo Opim Salim Sitompul Mardiningsih Informatics Engineering Study Program Faculty Engineering Universitas Medan Area Medan Indonesia Department of Mathematics Universitas Sumatera Utara Medan Indonesia Faculty of Computer Science and Information Technology Universitas Sumatera Utara Medan Indonesia

Today, almost everyone has done online shopping activities. The presence of e-commerce makes it easier for humans to do shopping. E-commerce companies compete to provide the best service to the community. One of them is in the delivery within the city. In terms of city delivery, the 2E-VRP model has been discussed a lot lately in terms of consolidating shipments. This study aims to present the 2E-VRP mathematical model and work in two stages to find a solution. In this article, the author also compares solutions with several heuristic models including 2-opt, repetitive nearest neighbor, nearest neighbor, farthest insertion, cheapest insertion, arbitrary insertion, and nearest insertion. From the results of research conducted by the 2-opt method, farthest insertion, cheapest insertion, and nearest insertion, the total distance is the best, all three get the same distance, then followed by the nearest insertion, arbitrary insertion, and nearest insertion methods.

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Optimization of hydrogen purification via vacuum pressure swing adsorption

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Energy Conversion and Management: X 2023年 20卷

作者： Chen, Wei-Hsin Chen, Wei-Hao Chein, Rei-Yu Tuan Hoang, Anh Manatura, Kanit Raza Naqvi, Salman Department of Aeronautics and Astronautics National Cheng Kung University Tainan701 Taiwan Research Center for Smart Sustainable Circular Economy Tunghai University Taichung407 Taiwan Department of Mechanical Engineering National Chin-Yi University of Technology Taichung411 Taiwan International Degree Program on Energy Engineering National Cheng Kung University Tainan701 Taiwan Department of Mechanical Engineering National Chung Hsing University Taichung402 Taiwan Institute of Engineering HUTECH University Ho Chi Minh City Viet Nam Department of Mechanical Engineering Faculty of Engineering at Kamphaeng Saen Kasetsart University Kamphaeng Saen Campus Nakhon Patom Thailand School of Chemical & Materials Engineering National University of Sciences & Technology H-12 Islamabad Pakistan

An experimental study was performed for hydrogen purification using the vacuum pressure swing adsorption (VPSA) process, commonly adopted in gas mixture separation using hollow fiber materials. This study aimed to examine the effects of the operating pressure and the H2 concentration in the H2/CO2 mixture on the H2 purity (HP) and H2 recovery (HR). A design of experiment (DoE) based on central composite design (CCD) was adopted to develop the response of the experimental domain and determine the optimal operating conditions of the process. The highest HP and HR obtained were close to 99.99 % and 72.39 %, respectively. However, the two responses, HP and HR, cannot reach the maximum values simultaneously in their response surfaces;one should compromise on the other. HP increased, but HR decreased as the operating pressure and H2 concentration increased. With the operating pressure of 1 kg∙ cm−2 and H2 concentration of 50 %, optimum HP and HR were found to be 99.17 % and 32.03 %, respectively. Analysis of variance (ANOVA) revealed that the built quadratic models consisting of the primary and interaction terms predicted the acceptable results for HP and HR based on p-values and R2. In addition, beyond the principle of a larger F-value and a p-value less than 0.05, the H2 concentration was identified as a more significant factor than the operating pressure. © 2023 The Authors

关键词： Design of experiments

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