Article
Engineering, Chemical
Abraham Kabutey, Cestmir Mizera, Oldrich Dajbych, Petr Hrabe, David Herak, Cimen Demirel
Summary: In this study, the extraction of pumpkin seed oil under uniaxial compression was optimized using a response surface methodology. The optimum processing factors were determined through experimental design and regression analysis, providing detailed information for optimizing mechanical oil pressing in large-scale oil production.
Article
Engineering, Civil
Kumar Gaurav, Ranjan Kumar, Prabhat Kumar Mandal, Arka Jyoti Das
Summary: A novel pyramidal design of a bearing plate is proposed for reinforcing ground in underground mines, which outperforms the conventional dome plate in terms of load resistance, load efficiency, and energy absorption. Experimental and numerical results show that the pyramidal plate has superior capacity compared to the dome plate, making it a promising solution for improved ground control and stability in underground openings.
ENGINEERING STRUCTURES
(2023)
Article
Thermodynamics
Wei Guo, Qinchuan Yang, Sunhua Deng, Qiang Li, Youhong Sun, Jianzheng Su, Chaofan Zhu
Summary: This study successfully investigated the oil shale heating method called autothermic pyrolysis in situ conversion process (ATS) and demonstrated its feasibility and high efficiency at a laboratory scale. The results showed that ATS yielded pyrolysis oil with a higher proportion of light components compared to the high-temperature nitrogen in situ conversion process (HNICP). These findings highlight the advantages and feasibility of ATS for large-scale commercial development of oil shale.
Article
Engineering, Chemical
Aviner Shreiber, Dmitry Portnikov, Haim Kalman
Summary: Single particle compression and impact tests were used to measure various parameters and analyze the relationships between compression force, projected area, and hardness. The study found that the applied force during impact was similar to the static compression force within a certain range of impact velocities. A semi-empirical model was developed to estimate the percentage of total kinetic energy required for surface and particle deformation.
Article
Engineering, Mechanical
Jacek Frost, Marcin Frycz, Jerzy Kowalski, Michal Wodtke, Wojciech Litwin
Summary: The purpose of this research is to compare the potential differences in bearing characteristics resulting from different lubricant types. The experimental results showed that environmentally acceptable lubricants have practically the same bearing properties as mineral oil. Variations in lubricant parameters do not significantly affect the bearing performance.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Electrical & Electronic
Davide Massocchi, Marco Lattuada, Steven Chatterton, Paolo Pennacchi
Summary: This study aims to optimize lubrication systems and achieve energy efficiency and CO2 emissions reduction. By using a specific tribological testing procedure, significant time and operational cost savings can be achieved, with good correlation to the FZG test results.
Article
Energy & Fuels
Matteo Fasano, Matteo Morciano, Luca Bergamasco, Eliodoro Chiavazzo, Massimo Zampato, Stefano Carminati, Pietro Asinari
Summary: The decrease in oil discoveries has driven the development of innovative and efficient extraction processes. Enhanced Oil Recovery techniques offer potential for producing a significant amount of trapped oil, with the injection of low salinity water into oilfields significantly enhancing oil extraction. Surface Reverse Osmosis plants provide the necessary low salinity water for this EOR technique, especially in offshore sites.
Article
Engineering, Petroleum
Yaoze Cheng, Yin Zhang, Abhijit Dandekar, Jiawei Li
Summary: This study proposes three hybrid nonthermal enhanced oil recovery (EOR) techniques to recover viscous oils in shallow reservoirs on the Alaska North Slope. The coreflooding experiments and tests conducted demonstrate that these techniques have better performance in reducing residual oil saturation compared to traditional methods. The use of solvent injection results in oil swelling and viscosity reduction, while decreasing the salinity of injected brine benefits the water flooding process.
Article
Construction & Building Technology
Han Gao, Zhenhai Li, Xigang Zhou, Xiaolong Yin
Summary: This study investigates a core material with irregular-shaped air flow channels for energy wheel applications. The material is modified to improve its performance, resulting in enhanced hygroscopic capacity and efficiency. Increasing the material's length and decreasing the air flow rate can also improve its efficiency. Mathematical models are used to analyze the latent efficiency of the material. Overall, the study demonstrates the potential of the proposed core material for energy wheel applications in air conditioning systems.
ENERGY AND BUILDINGS
(2022)
Article
Thermodynamics
Bing Qi, Desheng Zhang, Linlin Geng, Ruijie Zhao, Bart P. M. van Esch
Summary: This study designed a back-curved PAT and a front-curved PAT, and verified the accuracy of numerical calculation by comparing with experimental results. The entropy generation theory was used to compare the performance and energy loss of PATs, and it was found that the high efficiency range of the front-curved PAT is wider than that of the back-curved PAT. The energy loss in the PAT impeller mainly comes from turbulent entropy generation rate, and flow separation and flow impact are the main mechanisms of energy loss.
Article
Engineering, Chemical
Ivana Bunjan, Kresimir Grilec, Danko Coric
Summary: Aluminum foams reinforced with different steel elements were produced using the AluLight process, and their compression performance was tested. The study found that cylindrical steel mesh had the best effect on energy absorption and efficiency.
Article
Energy & Fuels
Wonil Kwak, Yongbok Lee
Summary: This study focuses on improving the energy efficiency of a piezoelectric energy harvester with a novel fractal structure by optimizing a model and investigating coupling coefficients. The fractal design efficiently converts energy responses at various frequencies.
Article
Thermodynamics
Mostafa Baghsheikhi, Majid Mohammadi
Summary: The growth of the electronic government and the increase in the number of internet service providers has led to the development of data centers. A major equipment in these centers is the cooling system, which is responsible for the continuous exhaust of heat generated by the equipment. Optimizing the efficiency of these systems is of great importance.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Green & Sustainable Science & Technology
Francisco Vergara, Gabriel Barthelemy, Omar Aizpurua, Marcelo F. Ortega, Bernardo Llamas
Summary: This study investigates a compressed air energy storage system based on compression trains in different configurations to adapt to the development of renewable energy. The research demonstrates that this flexible configuration can effectively utilize energy surplus and dynamically adjust the system according to demand fluctuations.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
Article
Energy & Fuels
Runnan Zhou, Dong Zhang, Jianguang Wei
Summary: Most of the oilfields in China are currently in the middle-late development stages, facing challenges such as high water cut and low permeability. This study proposed a new nuclear magnetic resonance (NMR) interpretation method and residual oil fluorescence analysis method to accurately identify and distribute remaining oil. Core displacement experiments were conducted using different methods, and the effects on recovery degree and remaining oil distribution were studied using NMR tests and fluorescence analysis. The results showed that different displacement methods had varying effects on oil recovery in different types of pores and for different types of remaining oil. The synergistic effect of the ASP system was found to significantly improve oil recovery. This study provides valuable insights into the occurrence state and distribution of remaining oil, laying the foundation for further enhancing oil recovery in oilfields.
Article
Engineering, Chemical
Abraham Kabutey, Cestmir Mizera, Oldrich Dajbych, Petr Hrabe, David Herak, Cimen Demirel
Summary: In this study, the extraction of pumpkin seed oil under uniaxial compression was optimized using a response surface methodology. The optimum processing factors were determined through experimental design and regression analysis, providing detailed information for optimizing mechanical oil pressing in large-scale oil production.
Article
Environmental Sciences
Sri Murniani Angelina Letsoin, Ratna Chrismiari Purwestri, Fajar Rahmawan, David Herak
Summary: This study aims to detect sago palms based on their physical morphology from Unmanned Aerial Vehicle (UAV) RGB imagery, using transfer learning approach with three deep pre-trained networks. The experiment shows that the ResNet-50 model becomes a preferred base model for sago palm classifiers, with precision of 75%, 78%, and 83% for sago flowers, leaves, and trunk respectively.
Article
Food Science & Technology
Abraham Kabutey, David Herak, Cestmir Mizera
Summary: The present study estimated the maximum oil yield and quality parameters of hulled sunflower seed samples under specific conditions. The results showed that heating temperatures affected the oil yield, but the unheated sample obtained the highest oil yield. The quality parameters of the oil samples were within the recommended threshold.
Article
Polymer Science
Viktor Kolar, Petr Hrabe, Miroslav Mueller, Monika Hromasova, David Herak, Hadi Sutanto
Summary: The research aimed to assess the impact of untreated and 5% aqueous NaOH solution-treated filler from Jatropha Curcas L. plant on the mechanical properties of adhesive bonds, particularly their service life under different amplitudes of cyclic loading. Jatropha oilseed cake cannot be used as livestock feed due to the presence of toxic phorbol ester. However, it can be utilized as a filler in polymer composites, such as composite adhesive layers. Experimental results showed an increase in shear strength for alkali-treated filler compared to untreated filler, but no significant effect on the service life of adhesive bonds was observed. SEM analysis revealed the presence of interlayer defects related to the oil-based filler used.
Article
Engineering, Chemical
Sri Murniani Angelina Letsoin, Ratna Chrismiari Purwestri, Mayang Christy Perdana, Petr Hnizdil, David Herak
Summary: This study examines the evaluation of the growth stage of food crops, such as paddy and maize, using two different sensors in selected developed areas of Papua Province of Indonesia. The study utilized Sentinel-1 Synthetic Aperture Radar (SAR) data to analyze the growth of paddy and maize crops. In situ measurements were obtained using an NGB camera to measure the Green Normalized Difference Vegetation Index (GNDVI) and Enhanced Normalized Difference Vegetation Index (ENDVI). The results were then analyzed based on Radar Vegetation Index (RVI) and backscatter data.
Article
Engineering, Chemical
Cestmir Mizera, Zdenek Ales, David Herak, Petr Hrabe, Abraham Kabutey, Richard A. M. Napitupulu, Nicoleta Ungureanu
Summary: Vegetable oils play a crucial role in protecting the environment sustainably. This paper discusses the potential use of coconut oils harvested in Indonesia as lubricants, focusing on their mechanical properties, water content, wear area, and lubrication performance. The results show that green and yellow types of coconut oils exhibit better lubrication properties.
Article
Engineering, Chemical
Oldrich Dajbych, Abraham Kabutey, Cestmir Mizera, David Herak
Summary: This study investigated the drying characteristics of apple slices under infrared and hot air oven drying methods. The results showed that the two methods had different effects on the properties of dried apple slices, and the Weibull distribution model was found to be the most suitable for describing the drying process.
Article
Food Science & Technology
Abraham Kabutey, David Herak, Cestmir Mizera
Summary: An oil press was used to evaluate the oil yield, seedcake, sediments, and material losses of sesame, pumpkin, flax, milk thistle, hemp, and cumin oilseeds. Sesame had the highest oil yield, while cumin had the lowest. With longer storage periods, sediments in the oil decreased and oil yield increased. Different oilseeds showed significant differences in quality parameters.
Article
Engineering, Chemical
A. Kabutey, C. Mizera, D. Herak
Summary: This study examined the oil output, energy, and mechanical properties of different oilseeds using a uniaxial compression process. The results showed variations in oil yield and residual oil content among different seeds, with pumpkin seeds having the highest oil yield and milk thistle seeds requiring the highest force and energy.
JOURNAL OF FOOD ENGINEERING
(2024)
Proceedings Paper
Agricultural Engineering
Cimen Demirel, David Herak, Abraham Kabutey, Oldrich Dajbych
Summary: This study evaluates the oil point parameters of bulk rapeseeds and sunflower seeds under compression loading, providing important information for optimizing mechanical oil extraction process involving screw presses through experimental and theoretical analyses.
20TH INTERNATIONAL SCIENTIFIC CONFERENCE ENGINEERING FOR RURAL DEVELOPMENT
(2021)