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2023

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Case Report And X-Ray Microtomography And Scanning Electron Microscopy Analysis Of Teeth With Hypocalcified Amelogenesis Imperfecta, Rodrigo W. Marinoni, Thiago G. Silva, Leonardo S. Benato, Anelize M B Rumbelsperger, Antonio Adilson Soares De Lima Dec 2023

Case Report And X-Ray Microtomography And Scanning Electron Microscopy Analysis Of Teeth With Hypocalcified Amelogenesis Imperfecta, Rodrigo W. Marinoni, Thiago G. Silva, Leonardo S. Benato, Anelize M B Rumbelsperger, Antonio Adilson Soares De Lima

Journal of Dentistry Indonesia

Amelogenesis imperfecta (AI) is a genetic disease characterized by producing morphological and structural changes in tooth enamel. Objective: To highlight the morphological changes observed in teeth with hypocalcified AI based on scanning electron microscopy and microtomography analysis. Case report: An adult male had teeth seriously compromised by hypocalcified AI. The treatment plan involved removal of third molars followed by restorative and prosthetic treatment. After extraction, the teeth were analyzed by SEM and X-ray microtomography (microCT). Teeth with AI revealed the presence of microfractures arranged from the outer surface to the center of the enamel. Microfractures had a cracked or “cracked …

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Comparison And Assessment Of Design, Handling Characteristics, And Efficacy Of Hand Instruments In Calculus Removal, Mohan Kumar Pasupuleti, Krishna Ganesh, Gautami S Penmetsa, Boddeda Anusha, Haripriya Narukurthi, Kommina Mouna Sahith Dec 2023

Comparison And Assessment Of Design, Handling Characteristics, And Efficacy Of Hand Instruments In Calculus Removal, Mohan Kumar Pasupuleti, Krishna Ganesh, Gautami S Penmetsa, Boddeda Anusha, Haripriya Narukurthi, Kommina Mouna Sahith

Journal of Dentistry Indonesia

Objective: primary objective of periodontal therapy is to remove supra and subgingival deposits from the tooth surface to stop disease progression. The purpose of the study is to address the instrument selection and its efficacy in calculus removal. Methods: A total of 50 subjects who fulfilled the criteria were included in the study. Participants were subjected to a complete periodontal examination, and the responses from 50 dental house surgeons were compared based on the instrument design, handling characteristics, and efficacy of calculus removal by using two sets of instruments. Results: The LM instrument was rated as best …

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Surface-Modified Pd/Ceo2 Single-Atom Catalyst Shows Increased Activity For Suzuki Cross-Coupling, Audrey Vice, Nicholas Langer, Benjamin J. Reinhart, Ofer Kedem Dec 2023

Surface-Modified Pd/Ceo2 Single-Atom Catalyst Shows Increased Activity For Suzuki Cross-Coupling, Audrey Vice, Nicholas Langer, Benjamin J. Reinhart, Ofer Kedem

Chemistry Faculty Research and Publications

Single-atom catalysts (SACs) comprise catalytically active atoms dispersed on supports; they combine the high activity and site uniformity of homogeneous catalysts with the ease of separability of heterogeneous catalysts. However, SACs lack fine control over the active site, provided by ligands in homogeneous catalysts. In this work, we demonstrate that modification of the support with an organic monolayer is a viable approach to improving the catalytic performance. The addition of catechol-type monolayers to a Pd/CeO2 SAC increases its catalytic activity for Suzuki cross-coupling, a central reaction in the synthesis of fine chemicals and pharmaceuticals. Kinetic trials reveal that the coating …

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Critical Links And Development Trends Of Research On Active Tectonics, Yuan Daoyang, Wang Youlin, Li Shuwu, Wang Wanhe, Li Linyuan, Zou Xiaobo, Wen Yameng Dec 2023

Critical Links And Development Trends Of Research On Active Tectonics, Yuan Daoyang, Wang Youlin, Li Shuwu, Wang Wanhe, Li Linyuan, Zou Xiaobo, Wen Yameng

Coal Geology & Exploration

Following a brief introduction of the general characteristics of active tectonics in China, this study analyzed two new features of large earthquakes with Ms ≥ 7 that have struck continental China since the beginning of the 21st century: (1) Large earthquakes occur primarily in clusters along the boundary fault zone of the Bayanhar active tectonic block—part of the Qinghai-Tibet ateau active tectonic block. (2) Reverse fault-fold earthquakes have occurred multiple times within active basins or at basin-mountain boundaries. In response to the new seismic activity features and the new demand for disaster prevention and mitigation of engineering construction and …

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New Evidence For Holocene Activity Of The Northern Segment Of The Puqian-Qinglan Fault In Northern Hainan Province, Liu Huaguo, Li Feng, Jia Qichao, Wang Zhicheng, Zhang Pan, Lin Zhen, Zhang Jiehan, Shi Chunhua, Zhang Yanbo, Jia Wei, Li Changlong Dec 2023

New Evidence For Holocene Activity Of The Northern Segment Of The Puqian-Qinglan Fault In Northern Hainan Province, Liu Huaguo, Li Feng, Jia Qichao, Wang Zhicheng, Zhang Pan, Lin Zhen, Zhang Jiehan, Shi Chunhua, Zhang Yanbo, Jia Wei, Li Changlong

Coal Geology & Exploration

The Puqian-Qinglan fault, located in northern Hainan Province, is closely related to the judgment of the seismogenic structure of the Qiongshan M7½ earthquake in 1605. To accurately determine the latest activity characteristics of this fault, this study, adopting artificial shallow seismic exploration with large-tonnage seismic sources combined with small-spacing cross-well stratigraphic correlation, investigated the sedimentary geological conditions of the Quaternary basalt cover and significantly thick marine sand layers in northern Hainan Province through exploration at Qishantou and Dongzhai villages in the Sanjiang Town, Jiangdong New Area, Haikou. Key results are as follows: (1) the Puqian-Qinglan fault dislocates multiple marker …

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Activity Of The Liyang-Nandu Fault In Southern Jiangsu, Zhang Shuo, Zhang Ping, Chen Huogen, Xu Shugang, Gong Xulong, Xu Hangang, Li Limei, Feng Wenli, He Zongnan Dec 2023

Activity Of The Liyang-Nandu Fault In Southern Jiangsu, Zhang Shuo, Zhang Ping, Chen Huogen, Xu Shugang, Gong Xulong, Xu Hangang, Li Limei, Feng Wenli, He Zongnan

Coal Geology & Exploration

Located in the central part of the Sunan Modernization Construction Demonstration Area—one of the areas with the densest population and urban areas and the most developed economy in China, the Liyang-Nandu fault is an important concealed fault with a nearly E-W strike in the Yangtze River Delta in eastern China. This fault serves as an important regional geomorphic and neotectonic boundary. However, there is a lack of systematic research on this fault, and its latest activity era is yet to be ascertained. Using seismic exploration P-waves and S-waves and cross-well stratigraphic correlation, this study investigated the spatial distribution and Quaternary …

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Application Of High-Precision Lidar Technology In Research On Active Fault-Induced Offset Geomorphic Features - A Case Study Of The Juxian-Tancheng Segment Of The Yishu Fault Zone, Yang Bin, Wang Hualin, Wu Hongbin, Ge Fugang, Zou Hao, Su Sili Dec 2023

Application Of High-Precision Lidar Technology In Research On Active Fault-Induced Offset Geomorphic Features - A Case Study Of The Juxian-Tancheng Segment Of The Yishu Fault Zone, Yang Bin, Wang Hualin, Wu Hongbin, Ge Fugang, Zou Hao, Su Sili

Coal Geology & Exploration

The Tancheng-Lujiang fault zone (also referred to as the TanLu fault zone), one of the most significant large-scale active faults in eastern China, has great seismogenic potential while passing through several cities with the activities and accumulation of human beings. To investigate the geometric distribution and activity characteristics of the TanLu fault zone, this study focused on the Juxian-Tancheng segment of the Yishu fault zone—a part of the TanLu fault zone. Given the vegetation coverage in eastern China, airborne light detection and ranging (LiDAR) and terrestrial laser scanning were employed to collect high-precision topographic data of the Zuoshan (Yibujian), Zhonghuashan, …

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Table Of Contents, The Editors Dec 2023

Table Of Contents, The Editors

Coal Geology & Exploration

No abstract provided.

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Theory And Application Of Setback Distance From Active Faults, Wei Leiming, Xu Xiwei, Li Feng, Cao Jun, Ren Junjie, Cheng Jia, Zhang Xianbing, Jia Qichao, Chen Guihua, Wu Xiyan Dec 2023

Theory And Application Of Setback Distance From Active Faults, Wei Leiming, Xu Xiwei, Li Feng, Cao Jun, Ren Junjie, Cheng Jia, Zhang Xianbing, Jia Qichao, Chen Guihua, Wu Xiyan

Coal Geology & Exploration

Determining setbacks from active faults is the “last 1 km” from active fault surveys to their application to seismic disaster mitigation. It is also a technique for blocking the risk sources of earthquake-induced chains of geologic hazards. Field investigations and experimental studies have demonstrated that buildings and structures can be free from catastrophic destruction caused by coseismic ruptures and offset of active faults provided they are kept at a certain finite distance from the active fault traces. Therefore, determining setbacks from active faults serves as an ultimate goal of the surveys and precise localization of active faults. Based on the …

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Revealing The Upper Crustal Structure In The Fujian Region Using Deep Seismic Profiling, Li Pei, Ren Congrong, Li Haiyan, Wang Shanxiong Dec 2023

Revealing The Upper Crustal Structure In The Fujian Region Using Deep Seismic Profiling, Li Pei, Ren Congrong, Li Haiyan, Wang Shanxiong

Coal Geology & Exploration

The Fujian region, located along the southeastern margin of the Chinese continent, constitutes an active tectonic belt along the coastal area in southeast China, with complex formation and evolution histories. To understand the characteristics of upper crustal structures and basement structures in the Fujian, this study collected the Pg travel time data from four NE-trending deep seismic sounding (DSS) survey lines in the region. Employing finite-difference tomography, this study obtained the fine-scale velocity structure of the upper crust along the four profiles, revealing the lateral variations in the upper crustal velocity structure, basement structures, and shallow fault characteristics in the …

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Analogue Modeling Of Love-Type Channel Waves And Their Response To Faults, Liu Qiang, Hu Jiwu, Wang Pan, Shi Xianxin, Jia Qian Dec 2023

Analogue Modeling Of Love-Type Channel Waves And Their Response To Faults, Liu Qiang, Hu Jiwu, Wang Pan, Shi Xianxin, Jia Qian

Coal Geology & Exploration

Owing to its high resolution and low energy attenuation, channel wave-based seismic exploration has been widely applied in the geophysical prospecting of hidden disaster-causing factors in underground coal mines. However, its accuracy fails to meet the requirements of intelligent mine mining presently. At present, the analogue modeling of channel waves mostly focuses on Rayleigh-type channel waves using 2D models, leading to a lack of research on Love-type channel waves. To explore the propagation law of Love-type channel waves, this study investigated the waves in the 3D analogue modeling of channel waves. Firstly, the wave and particle vibration characteristics of Love-type …

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Multipoint Sources-Based High-Resolution Electrical Detection Of The Water-Rich Areas Near Mining Faces Of Coal Mine Roadways, Wu Rongxin, Xu Hui Dec 2023

Multipoint Sources-Based High-Resolution Electrical Detection Of The Water-Rich Areas Near Mining Faces Of Coal Mine Roadways, Wu Rongxin, Xu Hui

Coal Geology & Exploration

To accurately explore the spatial distribution of water-rich areas near mining faces of mine roadways, this study proposed a multipoint sources-based high-resolution electrical detection technology. A multi-channel electrode observation system was arranged behind a roadway mining face, with electrodes at a distance of 1/4 measuring lines behind the mining face as point source electrodes sequentially. Data were collected using a monopole-dipole device, with the obtained apparent resistivity considered the sounding data of multipoint sources-based electrical detection. The images of multipoint sources-based electrical sounding allow for quickly determining the presence of water-rich areas and their locations relative to the mining faces …

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Coal-Based Solid Waste From The Panyi Mine In The Huainan Mining Area: Fine-Scale Chemical Structure And Ecological Risk Assessment Of Heavy Metals, Yin Wenwen, Zhang Liqun, Ding Dan, Shan Shifeng, Chen Yongchun, An Shikai, Zheng Liugen Dec 2023

Coal-Based Solid Waste From The Panyi Mine In The Huainan Mining Area: Fine-Scale Chemical Structure And Ecological Risk Assessment Of Heavy Metals, Yin Wenwen, Zhang Liqun, Ding Dan, Shan Shifeng, Chen Yongchun, An Shikai, Zheng Liugen

Coal Geology & Exploration

The utilization of clean coal-based solid waste is a pressing issue in the ecological construction of mining areas. To address this issue, the key is to ascertain the structures and morphology of heavy metals in coal-based solid waste. This study investigated the coal gangue and fly ash samples from the Panyi Mine in the Huainan mining area, Anhui Province. First, this study characterized the coal-based solid waste using microanalysis methods, such as X-ray fluorescence spectrometry (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR). Then, it examined the fine-scale chemical structure and heavy metal dissemination …

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Current States , Prediction And Prevention Suggestions For Water Hazard Accidents In China’S Coal Mines, Sun Wenjie, Li Wenjie, Ning Dianyan, Ren Lingfeng Dec 2023

Current States , Prediction And Prevention Suggestions For Water Hazard Accidents In China’S Coal Mines, Sun Wenjie, Li Wenjie, Ning Dianyan, Ren Lingfeng

Coal Geology & Exploration

At present, the pattern of coal resource development in China has changed, but the water hazard accidents that restrict the safety production of coal mine still occur from time to time. In order to explore the characteristics and laws of water hazard accidents in coal mines in China and scientifically study and judge the evolution trend of water hazard accidents, study was performed in terms of the year, region, accident level and influencing factors of water hazard accidents, with the nationwide water hazard accidents from 2001 to 2022 as the statistical objects. Meanwhile, the Long Short-Term Memory (LSTM) model was …

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Multi-Layer Strip Ionization Chamber For Proton Quality Assurance And Imaging, Shuang Zhou Dec 2023

Multi-Layer Strip Ionization Chamber For Proton Quality Assurance And Imaging, Shuang Zhou

McKelvey School of Engineering Graduate Student Theses & Dissertations

Proton therapy is the most advanced radiation treatment modality. Proton treatment is delivered via pencil beam scanning (PBS) technique, in which a pencil beam scans the target spot-by-spot and layer-by-layer. An effective quality assurance (QA) device is needed to verify the quality of treatment dose delivery. Current clinical practice employs films or a two-dimensional (2D) detector to measure the dose at one or a few arbitrarily selected depths, which is insensitive to delivery error and time-consuming. A 3D dosimeter that can measure the 3D dose distribution is needed to improve the effectiveness and efficiency of proton QA. Furthermore, preclinical studies …

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The Effects Of Poly(Ethylene Glycol) Grafting Density On The Extensional Solution Flows Of High Molecular Weight Polyacrylamide, Adam Linscott, Lauren Hong, Svetlana Morozova Dec 2023

The Effects Of Poly(Ethylene Glycol) Grafting Density On The Extensional Solution Flows Of High Molecular Weight Polyacrylamide, Adam Linscott, Lauren Hong, Svetlana Morozova

Faculty Scholarship

Controlling the extensional rheological properties of solutions is of great interest for a number of applications, such as printing and coatings, as polymeric additives can modify a fluid's droplet size, formation, and breakup. We have measured the extensional flows of polyacrylamide graft poly(ethylene glycol) amine (PAM-g-PEGa) solutions as a function of grafting density. PAM-g-PEGa is synthesized with grafting densities of 2.5%, 5.5%, 8%, and 30% and extensional flow was analyzed with drop-on-substrate rheology. Flow time scales and profiles are then compared to understand the effects of backbone extension from the addition of side chains. At low grafting densities, the viscous …

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How To Intercept A High-Speed Rocket With A Pair Of Compasses And A Straightedge?, Yagub N. Aliyev Dec 2023

How To Intercept A High-Speed Rocket With A Pair Of Compasses And A Straightedge?, Yagub N. Aliyev

CODEE Journal

In this paper a nonlinear differential equation arising from an elementary geometry problem is discussed. This geometry problem was inspired by one of the proofs of the first remarkable limit discussed in a typical first semester undergraduate Calculus course. It is known that the involved differential equation can be reduced to Abel’s differential equation of the first kind. In this paper the problem was solved using an approximate geometric method which constructs a piecewise linear solution approximation for the curve. The compass tool of GeoGebra was extensively used for these constructions. At the end of the paper, some generalizations are …

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Systematic Development Of Ionizable Lipid Nanoparticles For Placental Mrna Delivery Using A Design Of Experiments Approach, Rachel E. Young, Katherine Nelson, Samuel I. Hofbauer, Tara Vijayakumar, Mohamad-Gabriel Alameh, Drew Weissman, Charalampos Papachristou, Jason P Gleghorn, Rachel S. Riley Dec 2023

Systematic Development Of Ionizable Lipid Nanoparticles For Placental Mrna Delivery Using A Design Of Experiments Approach, Rachel E. Young, Katherine Nelson, Samuel I. Hofbauer, Tara Vijayakumar, Mohamad-Gabriel Alameh, Drew Weissman, Charalampos Papachristou, Jason P Gleghorn, Rachel S. Riley

Henry M. Rowan College of Engineering Departmental Research

Ionizable lipid nanoparticles (LNPs) have gained attention as mRNA delivery platforms for vaccination against COVID-19 and for protein replacement therapies. LNPs enhance mRNA stability, circulation time, cellular uptake, and preferential delivery to specific tissues compared to mRNA with no carrier platform. However, LNPs are only in the beginning stages of development for safe and effective mRNA delivery to the placenta to treat placental dysfunction. Here, we develop LNPs that enable high levels of mRNA delivery to trophoblasts in vitro and to the placenta in vivo with no toxicity. We conducted a Design of Experiments to explore how LNP composition, including …

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Combined Risk Based Inspection And Fault Tree Analysis For Repetitive 3-Phase Line Piping Leakage At West Java Offshore Topside Facility, Dona Yuliati, Akhmad Herman Yuwono, D. Rizal Asral, Donanta Dhaneswara Dec 2023

Combined Risk Based Inspection And Fault Tree Analysis For Repetitive 3-Phase Line Piping Leakage At West Java Offshore Topside Facility, Dona Yuliati, Akhmad Herman Yuwono, D. Rizal Asral, Donanta Dhaneswara

Journal of Materials Exploration and Findings

Hydrocarbon releases might result in serious consequences in various aspects. In addition to the contribution to environmental pollution, repetitive leakages need high repair costs. This study aim is to minimize potential repetitive leakage for other typical 3-phase piping systems. We conducted the risk assessment by adopting Risk Based Inspection (RBI) API 581 to identify risk level, calculating piping lifetime, recommended inspection plan and mitigations. The most relevant root causes can be obtained through quantitative Fault Tree Analysis (FTA). Observation and investigation was taken from eight 3-phase piping systems that experienced repetitive leakages. It has been found that the risk level …

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The Effect Of Parameters In Cryogenic Treatment On Mechanical Properties Of Tool Steel: A Review, Ronaldus Caesariano Ekaputra, Myrna Ariati Mochtar Dec 2023

The Effect Of Parameters In Cryogenic Treatment On Mechanical Properties Of Tool Steel: A Review, Ronaldus Caesariano Ekaputra, Myrna Ariati Mochtar

Journal of Materials Exploration and Findings

Tool steel is classified as special alloy steel which proposed as dies or mold materials as their high mechanical properties and dimensional stability. In order to improve tool steel’s mechanical properties, heat treatment process, especially, cryogenic treatment is conducted. Cryogenic treatment is done by exposing tool steel material at sub-zero liquid/gas media after heated at austenite temperature. This process significantly affects the martensite phase transformation increase and avoids retained austenite emersion. In particular, the higher martensite volume fraction, the higher hardness and wear resistance value of tool steel. It had been proven that adjusting critical process parameters of cryogenic treatment …

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Characteristics Of Sodium Lithium Titanate Synthesized At Different Solid-State Reaction Temperature For Lithium-Ion Battery Anode, Ilham Nur Dimas Yahya, Nofrijon Sofyan, Deni Shidqi Khaerudini, Gerald Ensang Timuda, Slamet Priyono Dec 2023

Characteristics Of Sodium Lithium Titanate Synthesized At Different Solid-State Reaction Temperature For Lithium-Ion Battery Anode, Ilham Nur Dimas Yahya, Nofrijon Sofyan, Deni Shidqi Khaerudini, Gerald Ensang Timuda, Slamet Priyono

Journal of Materials Exploration and Findings

The effect of sintering temperature on the characteristics of sodium lithium titanate (NaLiTi3O7/NaLTO) synthesized at different solid-state reaction temperature and its performance as lithium-ion battery anode has been investigated. The precursors for the synthesis consisted of LiOH.H2O, TiO2, and NaHCO3. The synthesis was performed via solid-state reaction method. The precursors were mixed and sintered at variation temperatures of 900oC, 1000oC, and 1100oC for 2 hours under atmosphere condition. The final product was characterized using X-ray diffraction (XRD) and particle size analyzer (PSA). The XRD …

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Nitrogen Gas Quenching Pressure Effect On Bs S155 Alloy Steel In Vacuum Furnace, Agus Mulyadi Hasanudin, Eddy Sumarno Siradj Dec 2023

Nitrogen Gas Quenching Pressure Effect On Bs S155 Alloy Steel In Vacuum Furnace, Agus Mulyadi Hasanudin, Eddy Sumarno Siradj

Journal of Materials Exploration and Findings

The production of metal and alloy products requires the use of heat treatment, when during the heat treatment process, quenching is a crucial step. The quenching medium can be anything from water, a salt bath, oil, air and gas. In a vacuum furnace, pressurized gas, most frequently nitrogen (N2) gas, serves as one of the quenching mediums. One of the drawbacks of the quenching process is the distortion and dimensional change of the parts. This paper aims to investigate the influence of nitrogen gas quenching pressure on the distortion and dimensional change of aerospace actuator gear planet parts …

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Pipeline Risk Analysis Optimization With Monte Carlo Method Using Gamma Distribution, Farhan Rama Digita, Jaka Fajar Fatriansyah, Abdul Rahim Ridzuan, Hanna Ovelia, Imam Abdillah Mas'ud, Irma Hartia Tihara, Baiq Diffa Pakarti Linuwih Dec 2023

Pipeline Risk Analysis Optimization With Monte Carlo Method Using Gamma Distribution, Farhan Rama Digita, Jaka Fajar Fatriansyah, Abdul Rahim Ridzuan, Hanna Ovelia, Imam Abdillah Mas'ud, Irma Hartia Tihara, Baiq Diffa Pakarti Linuwih

Journal of Materials Exploration and Findings

The inspection process of piping components in the oil and gas industry is one of the most crucial things, given the high risk posed by pipeline system failures, which have a huge impact on losses, both from environmental and financial aspects. Risk-based inspection with the Monte Carlo method is one of the efforts that can be made to minimize failures in piping systems, by involving data distribution to calculate the probability of component failure. Although the normal distribution is commonly used for generating random variables, its use in corrosion rate calculation can lead to overestimation due to negative corrosion rate …

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Effect Of Lime Content, Curing Temperature, And Aging Condition On Low-Alkaline Concrete, Mahdi Parsa Pour, Reza Shaban Sharghi, Faezeh Nejati, Elmira Khaksar Najafi Dec 2023

Effect Of Lime Content, Curing Temperature, And Aging Condition On Low-Alkaline Concrete, Mahdi Parsa Pour, Reza Shaban Sharghi, Faezeh Nejati, Elmira Khaksar Najafi

Makara Journal of Technology

This study determines how curing temperatures, aging condition, and hydrated lime contents affect the unconfined compressive strength (UCS), modulus of elasticity, and workability of low-alkaline concrete. Samples were prepared in two different groups to determine the optimum hydrated lime content and aging conditions to assess the mutual effect of NaOH molarity and curing temperature, that is, 70 °C for 48 h or room temperature, on samples with and without lime. The results showed that the increase in hydrated lime content affected alkali concentration. The samples with lime exhibited a clear peak in UCS (6 M NaOH) compared with the continuous …

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Briquette Of Empty Fruit Bunch Fiber As An Alternative Substitution For Binderless Fuel Methods, Nofriady Handra, Ade Indra Dec 2023

Briquette Of Empty Fruit Bunch Fiber As An Alternative Substitution For Binderless Fuel Methods, Nofriady Handra, Ade Indra

Makara Journal of Technology

Biomass development has been a key issue for the past few decades and will remain attractive in the future because of its cleanliness, renewability, carbon neutrality, and other advantages. This study aims to determine the optimal holding time for heating system briquettes by testing the heating value of empty fruit bunches fibers. The process of this research involves the use of one unit of briquette molding equipment by providing a heating system to the mold cylinder. Fibers were manually finetuned until they reached a size of 20 mesh (0.84 mm). Densification temperature is an essential factor that could affect the …

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Heat Transfer Enhancement In Nanofluid Flows Augmented By Magnetic Flux, Kozhikkatil Sunil Arjun, Rakesh Kumar Dec 2023

Heat Transfer Enhancement In Nanofluid Flows Augmented By Magnetic Flux, Kozhikkatil Sunil Arjun, Rakesh Kumar

Makara Journal of Technology

Heat transfer enhancement could be realized using magnetohydrodynamics together with nanofluids specifically in flow micro-convection in a microtube, flow past a vertical porous plate, and square duct flow with discrete heat sources numerically. A critical value for the Rayleigh number, a maximum value for the magnetic field strength, a low Reynolds number, and volume concentrations exists for thermal enhancement to simulate nanofluid flow in a microtube. Heat transfer enhancement is observed with a reduction in the magnetic field strength in a flow past a heated porous vertical plate. Alumina nanofluid subjected to Hartmann number 10 can boost 81% enhancement in …

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Isolation And Characterization Of Caffeine-Degrading Bacteria From Coffee Plantation Areas In Malaysia, Elvina Clarie Dullah, Mohd Fazli Farida Asras Dec 2023

Isolation And Characterization Of Caffeine-Degrading Bacteria From Coffee Plantation Areas In Malaysia, Elvina Clarie Dullah, Mohd Fazli Farida Asras

Makara Journal of Technology

Decaffeination by microbial degradation is currently the most optimal and low-cost approach, involving only microbial cells and/or their enzymes. The bacterium was characterized using a series of biochemical tests. Positive results were obtained from carbohydrate fermentation, citrate utilization, and catalase tests, while negative results were obtained from Voges-Proskauer (VP) and indole tests. Three different caffeine concentrations of 0.25%, 0.4%, and 2% were tested and measured through Gas Chromatography-Mass Spectrophotometry (GC-MS) analysis. The highest caffeine reduction (89.25%) was found when 0.25% caffeine was used in the media. Only a small amount of caffeine was reduced to 0.4% and 2%, with 34.78% …

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Optimization Of The Building Envelope And Roof Shading To Reduce The Energy Consumption Of College Low-Rise Buildings In Indonesia, Nasruddin Nasruddin, Azimil Gani Alam, Mohammad Imroz Sohel Dec 2023

Optimization Of The Building Envelope And Roof Shading To Reduce The Energy Consumption Of College Low-Rise Buildings In Indonesia, Nasruddin Nasruddin, Azimil Gani Alam, Mohammad Imroz Sohel

Makara Journal of Technology

Energy consumption in buildings is a crucial concern globally, prompting researchers to explore innovative solutions to mitigate its impact. This study investigates the optimization of building envelopes and roof shading systems of existing buildings in Indonesia to realize notable energy savings. Multiple scenarios were explored, with modifications to building envelopes and roof shading, highlighting the overall thermal transfer value as a key parameter. Using EnergyPlus simulations, the efficacy of natural ventilation in corridors and roof shading modifications was assessed in reducing energy consumption. The findings revealed that renovating existing buildings by optimization of the building envelope and roof shading by …

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Playing Video Games As A Supplement To Identity: Insights On Former College Athlete Transitions, Matthew T. Bowers Dec 2023

Playing Video Games As A Supplement To Identity: Insights On Former College Athlete Transitions, Matthew T. Bowers

Journal of Issues in Intercollegiate Athletics

Traditionally, researchers of sport and physical activity have considered playing video game to be an obstacle toward optimal health and social outcomes for youth. This study, however, posits video game play not as antithetical to health and physical activity, but as a meaningful forum utilized by former intercollegiate athletes to maintain salient aspects of their sport identities. Through a grounded theory analysis of a sample of 13 former intercollegiate athletes, this study takes initial steps toward a nuanced understanding of the manner in which video games can assist intercollegiate athletes who are transitioning out of elite athletic competition. The findings …

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From Rhetoric To Reality: Ncaa Division I Athletic Department Mission Statements And Student-Athlete Community Service Efforts, Emily J. Andrassy, Jennifer E. Bruening Dec 2023

From Rhetoric To Reality: Ncaa Division I Athletic Department Mission Statements And Student-Athlete Community Service Efforts, Emily J. Andrassy, Jennifer E. Bruening

Journal of Issues in Intercollegiate Athletics

With the growing emphasis in higher education on developing character and social responsibility, the NCAA CHAMPS/Life Skills program commitment to service is of interest as it encourages the development of well-rounded student athletes. In framing the current study, the researchers focused on how the communication of an athletic department’s mission impacts the community service activities for athletes. Mission statements are used to communicate the central purposes of organizations (Bart, 1996) to various internal and external audiences. Through website content analysis, this investigation reveals the importance placed upon service across athletic departments through the mission, and determines the effect of such …

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