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2020

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Articles 1111 - 1140 of 10640

Full-Text Articles in Engineering

Enhancing The Visibility Of Vernier Effect In A Tri-Microfiber Coupler Fiber Loop Interferometer For Ultrasensitive Refractive Index And Temperature Sensing, Fangfang Wei, Dejun Liu, Zhe Wang, Zhuochen Wang, Gerald Farrell, Qiang Wu, Gang-Ding Peng, Yuliya Semenova Nov 2020

Enhancing The Visibility Of Vernier Effect In A Tri-Microfiber Coupler Fiber Loop Interferometer For Ultrasensitive Refractive Index And Temperature Sensing, Fangfang Wei, Dejun Liu, Zhe Wang, Zhuochen Wang, Gerald Farrell, Qiang Wu, Gang-Ding Peng, Yuliya Semenova

Articles

In this paper a Vernier effect based sensor is analyzed and demonstrated experimentally in a tri-microfiber coupler (Tri-MFC) and polarization-maintaining fiber (PMF) loop interferometer (Tri-MFC-PMF) to provide ultrasensitive refractive index and temperature sensing. The main novelty of this work is an analysis of parameters of the proposed Tri-MFC-PMF with the objective of determining the conditions leading to a strong Vernier effect. It has been identified by simulation that the Vernier effect is a primary factor in the design of Tri-MFC-PMF loop sensing structure for sensitivity enhancement. It is furthermore demonstrated experimentally that enhancing the visibility of the Vernier spectrum in …


Explosive Compaction Of Additively Manufactured Material, Phillip R. Mulligan, Cody Lough, Douglas A. Bristow, Edward Kinzel, Catherine E. Johnson Nov 2020

Explosive Compaction Of Additively Manufactured Material, Phillip R. Mulligan, Cody Lough, Douglas A. Bristow, Edward Kinzel, Catherine E. Johnson

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Selective Laser Melting (SLM) is an additive manufacturing (AM) technique that uses a laser to locally fuse material in a metal-powder bed. The process is performed in layers enabling significant geometric freedom over traditional manufacturing techniques. During the deposition process, the metal is locally melted and rapidly self-quenched, leading to rapid solidification with well-defined melt-pool boundaries. Analogies are often drawn to the microstructure created in welding, albeit extending to the entire part. The SLM process parameters are optimized to produce near full density metal parts. The process parameters can also be adjusted to produce local regions that are of unmelted …


Effects Of Inert Additives On Cyclotrimethylene-Trinitramine (Rdx)/Trinitrotoluene (Tnt) Detonation Parameters To Predict Detonation Synthesis Phase Production, Martin Langenderfer, William Fahrenholtz, Catherine E. Johnson Nov 2020

Effects Of Inert Additives On Cyclotrimethylene-Trinitramine (Rdx)/Trinitrotoluene (Tnt) Detonation Parameters To Predict Detonation Synthesis Phase Production, Martin Langenderfer, William Fahrenholtz, Catherine E. Johnson

Materials Science and Engineering Faculty Research & Creative Works

A methodology was developed to predict pressure and temperature regimes achieved during detonation of RDX/TNT compositions with inert granular inclusions. The predicted pressures and temperatures are used as inputs for thermochemical simulations to design detonation synthesis experiments that utilize shock-induced chemical reactions to produce ceramic nanomaterials. This study computationally assessed the effects of inert spherical sand inclusions and porosity produced by inert additives on the sensitivity of the explosive composition during the shock-to-detonation transition using a limited scope approach through Lee-Tarver ignition and growth modeling. On the continuum scale, the effects of inert additives on pressure generation behind the detonation …


Feasibility Study Of The Implementation Of An Effective And Eco-Friendly Energy Management System : Case Study Of Palermo's Fincantieri Shipyard, Bryan Singer Asturias Nov 2020

Feasibility Study Of The Implementation Of An Effective And Eco-Friendly Energy Management System : Case Study Of Palermo's Fincantieri Shipyard, Bryan Singer Asturias

World Maritime University Dissertations

No abstract provided.


Simulation Of A Unit Injector For Ammonia Injection In A Compression Ignition Engine, Mohammed Aziem Rujub Nov 2020

Simulation Of A Unit Injector For Ammonia Injection In A Compression Ignition Engine, Mohammed Aziem Rujub

World Maritime University Dissertations

No abstract provided.


Effect Of Landfill Leachates On Some Water Quality Indicators Of Selected Surface Water And Groundwater At Ilokun, Ado-Ekiti, Nigeria, Olorunwa Omofunmi, Adesola Satimehin, Abraham Oloye, Okwunna Umego Nov 2020

Effect Of Landfill Leachates On Some Water Quality Indicators Of Selected Surface Water And Groundwater At Ilokun, Ado-Ekiti, Nigeria, Olorunwa Omofunmi, Adesola Satimehin, Abraham Oloye, Okwunna Umego

Makara Journal of Technology

This study was conducted to examine the impact of dumpsites on the quality of groundwater and surface water. The water samples and leachates were collected from dumpsites in respective zones. The physicochemical properties of the samples were examined and determined in accordance with the standards of the American Public Health Association. Results indicated that the groundwater and surface water that are close to the dumpsites have an electrical conductivity of 385 and 245 Sd/cm, total dissolved solids of 168 and 128 mg/L, a turbidity of 4.6 and 22 NTU, a total alkalinity of 103 and 50 mg/L, a total hardness …


Interleaved Multistage Step-Up Topologies With Voltage Multiplier Cells, Ahmad Alzahrani, Pourya Shamsi, Mehdi Ferdowsi Nov 2020

Interleaved Multistage Step-Up Topologies With Voltage Multiplier Cells, Ahmad Alzahrani, Pourya Shamsi, Mehdi Ferdowsi

Electrical and Computer Engineering Faculty Research & Creative Works

This paper proposes a family of high-voltage-gain step-up dc-dc converters for photovoltaic integration application. The proposed converters are capable of converting the low voltage from input sources to a dc bus. The proposed family is constructed of interleaved single-switch multistage boost converters and voltage multiplier cells (VMC). The proposed converters feature low voltage stress across the components, equal current sharing among all phases, and a smooth input current. Moreover, the proposed family of converters has a modular structure in both the VMC and the boost stage. That is, the VMC can have N number of cells, and the boost stage …


Optimal Distribution System Reconfiguration Incorporating Dg And Variable Load Profile Using Artificial Neural Network, Hesham Hanie Youssef Nov 2020

Optimal Distribution System Reconfiguration Incorporating Dg And Variable Load Profile Using Artificial Neural Network, Hesham Hanie Youssef

Student Works (2020-2029)

Optimal network reconfiguration is a common method used in distribution systems to ensure minimum power losses are always attained. This is very important task for achieving cost effective operation. Due to varying load demands, conventional network reconfiguration techniques have to be repeated whenever system loading changes to find a new configuration that has minimum power losses. This task is time consuming and ineffective approach for a real time application. Therefore, this research proposes an Artificial Neural Network (ANN) technique for optimal distribution network reconfiguration to overcome long processing time, mainly in load variation case. The proposed method involves; (1) Implement …


Microstrip Filters: A Review Of Different Filter Designs Used In Ultrawide Band Technology, Hussain Bohra, Giriraj Prajapati Nov 2020

Microstrip Filters: A Review Of Different Filter Designs Used In Ultrawide Band Technology, Hussain Bohra, Giriraj Prajapati

Makara Journal of Technology

In this study, optimization techniques applied in designing microstrip bandpass ultra-wideband (UWB) filters are presented. Optimization based on various defected ground structure techniques, resonator designs, and type of dielectric materials is discussed. Microstrip bandpass filters implemented at UWB frequency bands used in wireless communication systems have key features to control frequency response in passband and stopband. Optimization techniques are studied to attain optimum performance of bandpass microstrip filters to ensure minimum insertion loss, high selectivity, compactness, sharp transitions at cut-off frequencies, high return loss, and excellent linearity. Extensive study shows that proper selection of fabrication techniques and type of material …


Effect Of Catholyte Concentration On Current Production During Chocolate Industry Wastewater Treatment By A Microbial Fuel Cell, Diana Rahayuning Wulan, Suprihanto Notodarmojo Nov 2020

Effect Of Catholyte Concentration On Current Production During Chocolate Industry Wastewater Treatment By A Microbial Fuel Cell, Diana Rahayuning Wulan, Suprihanto Notodarmojo

Makara Journal of Technology

Microbial fuel cells (MFCs) use bacteria as a catalyst to oxidize organic and/or inorganic substrates and produce electric currents. Wastewater could function as an electron donor in the anode chamber and, thus, represents a very promising energy source. Catholytes, as electron acceptors, influence power production in MFCs by increasing the availability of electrons. The present research aims to determine the influence of catholyte concentration on current production in an aerobic two-chamber MFC. Aerobic treatment was carried out in the two-chamber MFC operated in an incubator at 37  1 °C with and without aeration in the cathode chamber. Wastewater from …


Evaluation Of Il-17a And Il-17f Gene Expression In Peripheral Blood Mononuclear Cells In Different Clinical Stages Of Chronic Hepatitis B Infection In An Iranian Population, Tannaz Akbari Kolagar, Seyed Reza Mohebbi, Fatemeh Ashrafi, Shahrzad Shoraka, Hamid Asadzadeh Aghdaei, Mohammad Reza Zali Nov 2020

Evaluation Of Il-17a And Il-17f Gene Expression In Peripheral Blood Mononuclear Cells In Different Clinical Stages Of Chronic Hepatitis B Infection In An Iranian Population, Tannaz Akbari Kolagar, Seyed Reza Mohebbi, Fatemeh Ashrafi, Shahrzad Shoraka, Hamid Asadzadeh Aghdaei, Mohammad Reza Zali

Makara Journal of Technology

Hepatitis B virus (HBV) infection is one of the main causes of liver damage, which can also lead to chronic hepatitis B (CHB) infection. More than 240 million individuals worldwide are chronic carriers of HBV. Among individuals with CHB who are untreated, approximately 15% – 40% will progress to liver cirrhosis or cancer. The interactions between HBV and host immune response play significant roles in the progression of CHB. CHB can be generally divided into four different clinical phases: immune tolerance (IT), immune clearance, inactive carrier, and Hepatitis B surface antigen (HBsAg)-negative reactivation phase (ENEG). Many studies showed that interleukins …


Redesign Of Product Packaging With Kansei Engineering: Empirical Study On Small-Medium Enterprises In Indonesia, Amalia Suzianti, A. Aldianto Nov 2020

Redesign Of Product Packaging With Kansei Engineering: Empirical Study On Small-Medium Enterprises In Indonesia, Amalia Suzianti, A. Aldianto

Makara Journal of Technology

Small-medium enterprises (SMEs) in Indonesia have been proven to be one of the important pillars of the national economy. Unfortunately, some problems hinder their development, and one of the critical problems is the quality of product packaging. The packages of SME products are considered poor, dirty, and unattractive. Packaging problem is one of the factors why consumers are less interested in buying and why SME products always lose in the competition with other products. This study discusses how to employ Kansei engineering to design better SME product packaging with a focus on psychological (affective) aspects. This research concludes that there …


Effect Of Pvdf-Ca Ratio On Electrospun Membrane For Water–Oil Filtration Application, Mohamad Haziq Alias, Izan Izwan Misnon, Rajan Jose Nov 2020

Effect Of Pvdf-Ca Ratio On Electrospun Membrane For Water–Oil Filtration Application, Mohamad Haziq Alias, Izan Izwan Misnon, Rajan Jose

Makara Journal of Technology

Oil spillage and generation of industrial water–oil wastewater mixture ignite a focus on filtration technology. Electrospinning technique provides a versatile route in producing tunable diameter and pores in nanofiber filtration membrane development. In this work, polyvinylidene difluoride (PVDF) and cellulose acetate (CA) electrospun membrane at different concentration ratios were synthesized for water–oil filtration application. The polymeric solutions were characterized using viscometer and conductivity testing, whereas the membranes were analyzed using contact angle, tensile test, scanning electron microscopy (SEM), and filtration testing of oil (dichloromethane). Conductivity test showed a decreased conductivity along with decrement of CA ratio in the polymeric solution. …


Performance-Shaping Factors Of Personnel Performing Evacuation And Escape On Offshore Installations In Tropical, Norafneeza Norazahar, Nur Azizah Arryanie Morshidi, Arshad Ahmad, Wijayanuddin Mohd Ali Nov 2020

Performance-Shaping Factors Of Personnel Performing Evacuation And Escape On Offshore Installations In Tropical, Norafneeza Norazahar, Nur Azizah Arryanie Morshidi, Arshad Ahmad, Wijayanuddin Mohd Ali

Makara Journal of Technology

Performance-shaping factors (PSFs) are used to address the strengths and weaknesses of workers performing escape and evacuation activities. These PSFs are time, environmental factors as stressors, complexity of activities, experiences and training, interaction between workers and emergency equipment, workers’ physical conditions, and procedures. This paper presents a survey work on fitness for the duty of workers performing basic offshore survival and emergency response training. The training provides credible scenarios of escape and evacuation in case of an emergency of offshore installations in tropical waters. The survey is conducted among participants of the tropical basic offshore safety induction & emergency training …


Fabrication And Characterisation Of Highly Aligned Fibrous Assemblies, Tan Chin Joo Nov 2020

Fabrication And Characterisation Of Highly Aligned Fibrous Assemblies, Tan Chin Joo

Student Works (2020-2029)

Vascular grafting has been an effective remedy to vascular diseases for decades. Autografting by using the veins or arteries in the patient’s body is found to have patency rate for years. However, autografting may not be possible when compatible vessels are not available. In this case, synthetic vascular grafts are found to be effective replacements. Nevertheless, synthetic grafts with diameter less than 4 mm becomes challenging due to thrombogenicity and mismatch of mechanical properties with the native vessels. Along this line, the ability to develop new biostable synthetic materials suitable for smaller grafts and the ability to evaluate their resulting …


Compliance Assessment Of The National Oil Spill Contingency Plan Of The Philippines On 1990 International Convention On Oil Spill Preparedness, Response And Co-Operation Using Retos, Godofredo Garcia Vagilidad Nov 2020

Compliance Assessment Of The National Oil Spill Contingency Plan Of The Philippines On 1990 International Convention On Oil Spill Preparedness, Response And Co-Operation Using Retos, Godofredo Garcia Vagilidad

World Maritime University Dissertations

No abstract provided.


The Development Of An Operational Kpi For Energy Efficiency Ship Operation, Danuja Wijayanto Nov 2020

The Development Of An Operational Kpi For Energy Efficiency Ship Operation, Danuja Wijayanto

World Maritime University Dissertations

No abstract provided.


The Energy Efficiency Of Maritime Autonomous Surface Ship (Mass), Dang Cuong Nguyen Nov 2020

The Energy Efficiency Of Maritime Autonomous Surface Ship (Mass), Dang Cuong Nguyen

World Maritime University Dissertations

No abstract provided.


Accident Analysis And Prevention : Application Of Hfacs In Maritime Casualty Investigation Reports Of Ecuador, David Guevara Haro Nov 2020

Accident Analysis And Prevention : Application Of Hfacs In Maritime Casualty Investigation Reports Of Ecuador, David Guevara Haro

World Maritime University Dissertations

No abstract provided.


Promoting Maritime Safety Through ‘Findings’ Of Accident Investigations, Surveys And Audits In The Pacific : The Case Of Papua New Guinea, Conny Ralph Hauseng Nov 2020

Promoting Maritime Safety Through ‘Findings’ Of Accident Investigations, Surveys And Audits In The Pacific : The Case Of Papua New Guinea, Conny Ralph Hauseng

World Maritime University Dissertations

No abstract provided.


Feasibility Study For A Hybrid Renewable Energy System At The International Maritime University Of Panama, Adriana Marie Quesada Juarez Nov 2020

Feasibility Study For A Hybrid Renewable Energy System At The International Maritime University Of Panama, Adriana Marie Quesada Juarez

World Maritime University Dissertations

No abstract provided.


Assessing Oil Spill Management In Senegal Using The Iso 31000 : 2018 Standard As A Risk Management Framework, Abdou Aziz Diouf Nov 2020

Assessing Oil Spill Management In Senegal Using The Iso 31000 : 2018 Standard As A Risk Management Framework, Abdou Aziz Diouf

World Maritime University Dissertations

No abstract provided.


A Comparative Study Of The Implementation Of Oil Spill Contingency Planning In Promoting Ocean Sustainability And Governance : A Case Study Of Ghana And Canada., Marvin Bang-Gesina Ayoo Nov 2020

A Comparative Study Of The Implementation Of Oil Spill Contingency Planning In Promoting Ocean Sustainability And Governance : A Case Study Of Ghana And Canada., Marvin Bang-Gesina Ayoo

World Maritime University Dissertations

No abstract provided.


Saudi Regime For Ships Source Oil Spill In The Arabian Gulf Preparedness And Response, Abdullah M. Almutairi Nov 2020

Saudi Regime For Ships Source Oil Spill In The Arabian Gulf Preparedness And Response, Abdullah M. Almutairi

World Maritime University Dissertations

No abstract provided.


The Application Of Renewable Energy Supply In A Port Container Terminal : Bandar Abbas Port Container Terminal Case Study, Zhila Gordani Nov 2020

The Application Of Renewable Energy Supply In A Port Container Terminal : Bandar Abbas Port Container Terminal Case Study, Zhila Gordani

World Maritime University Dissertations

No abstract provided.


Bibliometric Survey On Supply Chain In Healthcare Using Artificial Intelligence, Shruti Maheshwari, Gagandeep Kaur, Ketan Kotecha, Pramod Kumar Jain Dr. Nov 2020

Bibliometric Survey On Supply Chain In Healthcare Using Artificial Intelligence, Shruti Maheshwari, Gagandeep Kaur, Ketan Kotecha, Pramod Kumar Jain Dr.

Library Philosophy and Practice (e-journal)

With the increasing demand for the supply chain in the service sector, new techniques have become essential. With the latest emerging technologies, it has become crucial to have a bibliometric analysis of supply chain management (SCM) in the healthcare sector. The paper represents the analysis of research supply chain in the service sector using artificial intelligence techniques. The main aim of the analysis is to accomplish the technology in healthcare supply chain management using SCOPUS, Google Scholar, Research Gate, etc. and the various softwares like Gephi, GSP Visualizer, etc. The bibliometric analysis shows that India has ranked 4th in publishing …


Carbon Nanotube-On-Graphene Heterostructures, Yu Zheng, Dongmeng Li, Zubair Ahmed, Jeongwon Park, Changjian Zhou, Cary Y. Yang Nov 2020

Carbon Nanotube-On-Graphene Heterostructures, Yu Zheng, Dongmeng Li, Zubair Ahmed, Jeongwon Park, Changjian Zhou, Cary Y. Yang

Electrical and Computer Engineering

This paper presents a brief review of experimental and theoretical studies on a three-dimensional heterostructure consisting of vertical carbon nanotubes (CNTs) connected perpendicularly to a graphene layer. This structure can serve as a potential building block for an all-carbon network in energy storage devices and on-chip interconnects. The review highlights reported works on the fabrication and characterization of such a heterostructure, with focus on the effect of the CNT-graphene interface on electrical conduction. While a direct comparison between experiment and theory is not possible at this time, a brief survey of theoretical efforts based on atomic cluster models nonetheless reveals …


Triboelectric Energy Harvester With Large Bandwidth Under Harmonic And Random Excitations, Alwathiqbellah Ibrahim, Abdallah Ramini, Shahrzad Towfighian Nov 2020

Triboelectric Energy Harvester With Large Bandwidth Under Harmonic And Random Excitations, Alwathiqbellah Ibrahim, Abdallah Ramini, Shahrzad Towfighian

Mechanical Engineering Faculty Publications and Presentations

This paper investigates an approach to impact vibration energy harvesting using a triboelectric mechanism under harmonic and random excitation. The harvester consists of a clamped–clamped beam with a stiff plate in the middle to realize the impact electrification process when subjected to external vibrations. The harvester uses stiffening in the clamped–clamped beam introduced by the impact between two triboelectric layers to increase the frequency bandwidth. A piecewise theoretical model is used to model the harvester for two scenarios of motions, before and after impact. The harvester is tested experimentally under different harmonic excitation to validate the theoretical model. The outcomes …


Laboratory Results And Mathematical Modeling Of Spore Surface Interactions In Stormwater Runoff, Anne M. Mikelonis, Katherine Ratliff, Sungmin Youn Nov 2020

Laboratory Results And Mathematical Modeling Of Spore Surface Interactions In Stormwater Runoff, Anne M. Mikelonis, Katherine Ratliff, Sungmin Youn

All Engineering Faculty Research

Development of numerical models to predict stormwater-mediated transport of pathogenic spores in the environment depends on an understanding of adhesion forces that dictate detachment after rain events. Zeta potential values were measured in the laboratory for Bacillus globigii and Bacillus thuringiensis kurstaki, two common surrogates used to represent Bacillus anthracis, in synthetic baseline ultrapure water and laboratory prepared stormwater. Zeta potential curves were also determined for materials representative of urban infrastructure (concrete and asphalt). These data were used to predict the interaction energy between the spores and urban materials using Derjaguin-Landau-Verwey-Overbeek (DLVO) modeling. B. globigii and B. thuringiensis kurstaki …


Effectiveness Of Building Systems Strategies For Mitigation Of Airborne Transmission Of Sars-Cov-2, Meng Kong, Jialei Shen, Bing Dong, Jianshun Jensen Zhang Nov 2020

Effectiveness Of Building Systems Strategies For Mitigation Of Airborne Transmission Of Sars-Cov-2, Meng Kong, Jialei Shen, Bing Dong, Jianshun Jensen Zhang

Mechanical and Aerospace Engineering - All Scholarship

Airborne transmission has been recognized as a major transmission pathway for the infectious disease COVID-19. This study investigated the effectiveness of several indoor air quality (IAQ) control strategies on the mitigation of airborne transmission of SARS-CoV-2, the virus that causes COVID-19. The well-known airborne disease infection risk model (Wells-Riley equation) was used to estimate the infection risk of the SARS-CoV-2 in seven (7) different types of spaces including conference center/ballrooms, hotel bistro//cafeteria, hotel lobby, classrooms (lecture), conference room/small classroom, hotel or cruise ship guest rooms and open plan offices. The IAQ control strategies included increased ventilation rate, improved air distribution …