Detection And Identification Of Covert Devices Using Infrared And Stacked Optics Detection,
2023
Air Force Institute of Technology
Detection And Identification Of Covert Devices Using Infrared And Stacked Optics Detection, Michael A. Reyneke
Theses and Dissertations
This work investigates stacked optics detection methodologies to successfully detect and identify observational systems with a cyber-physical sensing tool, ODIN (Observational Device Identification Network). ODIN successfully detected the presence of stacked optics and LiDAR systems using night-vision devices with a 96.32% average accuracy rating, both overt and covertly placed, with objective lens diameters ranging from 17 mm to 50 mm at distances between 1 m to 5 m with and without commonly employed anti-reflective countermeasures. ODIN provides a foundation for counter- measure capabilities of NIR devices and stacked optical systems in stationary environments. Additionally, a pilot study on smartphone LiDAR …
Optimal Energy Management For Off-Grid Hybrid Renewable Energy Systems,
2023
Department of Electrical Engineering, College of Engineering and Technology, University of Dar es Salaam, P.O Box 35131, Dar es Salaam, Tanzania.
Optimal Energy Management For Off-Grid Hybrid Renewable Energy Systems, Owdean M. Suwi
Tanzania Journal of Engineering and Technology (TJET)
A photovoltaic (PV)/wind/battery/Generator-Set hybrid power system's energy dispatch is discussed in this research, along with the ideal solution. The optimization model enables the hybrid power system's generating devices to share power appropriately. The main goals are to minimize fuel consumption and costs and maximize the usage of Renewable Energy Sources (RES). The proposed simulation plan succeeds in lowering fuel costs because the diesel generator only kicks on at night and in the early morning when the energy from RES is insufficient to supply the load. The load is supplied with power, and the battery is charged throughout the day, when …
Development Of Solar Pv Systems For Mini-Grid Applications In Tanzania,
2023
Department of Mechanical and Industrial Engineering, College of Engineering and Technology, University of Dar es Salaam
Development Of Solar Pv Systems For Mini-Grid Applications In Tanzania, Seleman Mayanjo
Tanzania Journal of Engineering and Technology (TJET)
Access to electricity offers great benefits to development through the provision of reliable and efficient energy sources in the country. Majority of the population living in the remote and rural areas of developing countries mostly sub-Saharan Africa are not supplied with electricity. Although the governments through their electricity companies put their effort to extends the grid distribution networks to remote and rural areas still the coverage were not sufficiently enough due to growing demands for safe and reliable electricity. However, solar as a source of energy remains the least utilized energy source in many countries including Tanzania. Solar Photovoltaic (PV) …
Studying Dielectric Losses Of Serially Combined Silicone Rubber And Epoxy Resin,
2023
university of dar es salaam
Studying Dielectric Losses Of Serially Combined Silicone Rubber And Epoxy Resin, Aviti Thadei Mushi
Tanzania Journal of Engineering and Technology (TJET)
High voltage outdoor insulation systems are conventionally ceramics and glass with several advantages, such as proven in the field, excellent dielectric properties, durability, and long life. However, they are heavy, attract vandals and break easily, and they can lose their dielectric properties easily when subjected to high voltage transients, arcing, and surges. To curb this, polymer insulators are used because they have excellent dielectric properties, such as those of ceramics and glass, with the added advantages that they do not break easily and recover their lost dielectric properties after any electrical transients. Therefore, this paper investigates the dielectric properties of …
Comparison Of On-Line Partial Discharge Detection Techniques For High Voltage Power Cable Joints And Terminations,
2023
university of dar es salaam
Comparison Of On-Line Partial Discharge Detection Techniques For High Voltage Power Cable Joints And Terminations, Aviti Thadei Mushi
Tanzania Journal of Engineering and Technology (TJET)
Cable joints and terminations play a vital role in providing dependable electrical connection, mechanical support and physical safeguard. These provide electrical stress control to shielded power cables. Despite their usefulness, they suffer from partial discharges (PD) because of enhanced voltage stress, moisture ingress and poor workmanship (during installation). Therefore, it is necessary to undertake on-line PD detection to determine their state. Some of these techniques are capacitive coupler (CC); acoustic emission (AE); and high frequency current transducer (HFCT). This article presents a literature review of these techniques based on the cost, availability, and applicability. The comparative analysis is also provided …
Semiconductor Devices,
2023
Kennesaw State University
Semiconductor Devices, Sheila D. Hill Pe
KSU Distinguished Course Repository
3 Class Hours, 0 Laboratory Hours, 3 Credit Hours Prerequisites: CHEM 1211, CHEM 1211L, EE 1000
This course effectively applies the knowledge of chemistry and physics to understand the operating principles of various semiconductor devices. The course covers topics starting from the fundamental concepts of atomic and crystal structure, crystal growth, impurity doping and energy bands to the in-depth device operation and quantitative analysis of p-n junction diode, metal-semiconductor contacts and Schottky diode, BJTs and MOSFETs. Also fundamental operating principles of optoelectronic devices such as, LEDs and photodiodes are discussed. Simple device simulation components reinforces the understanding of various critical …
Zno Varistors – The Ideal Microstructure And Characteristics, And Methods Investigated And Developed To Achieve These,
2023
Technological University Dublin
Zno Varistors – The Ideal Microstructure And Characteristics, And Methods Investigated And Developed To Achieve These, Maura Kelleher
Books/Book Chapters
ZnO-Bi2O3-Sb2O3 varistors have been extensively studied since their discovery 5 decades ago. Their function in protecting increasingly sensitive electronic components by absorbing random surges of energy is even more important today. Also, the metal oxides from which they are made from are becoming even more precious. Their electrical characteristics are highly dependent on their microstructural characteristics which are highly dependent on their composition and methods used. The purpose of this article is to explain the ideal microstructure required to obtain the ideal electrical characteristics, the powder preparation methods investigated and developed to achieve it, and some future directions are outlined.
Comparing The Iwl-Mvm-Rs And Minstrel-Ht Rate Adaptation Algorithms Under Different Local Error Conditions,
2023
Technological University Dublin, Ireland
Comparing The Iwl-Mvm-Rs And Minstrel-Ht Rate Adaptation Algorithms Under Different Local Error Conditions, Luhan Wang, Mark Davis
Conference papers
WLAN technology has grown rapidly and now provides increasingly reliable and fast wireless connectivity. A number of Rate Adaptation Algorithms (RAAs) which are designed to select the optimal line rate according to the channel conditions have been proposed. Iwl-Mvm-Rs RAA which is implemented in the Intel wireless chips and Minstrel-HT RAA which is implemented in the Linux kernels are two such well known algorithms. Many existing papers evaluate these two algorithms with regard to device mobility and signal fading. However, the causes of frame errors can be divided into two categories: weak signal reception and collisions. Therefore, in this paper, …
Simultaneous Measurement Of Gas Pressure And Temperature Using A Microbubble Resonator Combined With An Fbg,
2023
Harbin Engineering University, China
Simultaneous Measurement Of Gas Pressure And Temperature Using A Microbubble Resonator Combined With An Fbg, Ketan Dong, Ke Tian, Chuanzhen Zhao, Huibin Li, Jibo Yu, Angzhen Li, Xiaoling Sun, Elfed Lewis, Gerald Farrell, Pengfei Wang
Conference Papers
We propose and demonstrate a microbubble resonator combined with a fiber Bragg grating (FBG) for simultaneous measurement of gas pressure and temperature. The approach used allows for very close proximity (<200 >μm) between the FBG and the microbubble resonator. The microbubble resonator is fabricated in a section of hollow-core fiber (HCF), spliced to a single-mode fiber (SMF) with a pre-inscribed FBG to form a single-ended open structure. Fresnel reflection from the HCF cleaved end means that broadband light is reflected backwards in the same direction as the Bragg wavelength from the FBG. A tapered fiber couples the reflected broadband light …
Towards Explainable Ai Using Attribution Methods And Image Segmentation,
2023
University of Central Florida
Towards Explainable Ai Using Attribution Methods And Image Segmentation, Garrett J. Rocks
Honors Undergraduate Theses
With artificial intelligence (AI) becoming ubiquitous in a broad range of application domains, the opacity of deep learning models remains an obstacle to adaptation within safety-critical systems. Explainable AI (XAI) aims to build trust in AI systems by revealing important inner mechanisms of what has been treated as a black box by human users. This thesis specifically aims to improve the transparency and trustworthiness of deep learning algorithms by combining attribution methods with image segmentation methods. This thesis has the potential to improve the trust and acceptance of AI systems, leading to more responsible and ethical AI applications. An exploratory …
Coalition Formation And Beamsteering Optimization For Directional Software-Defined Radios,
2023
University of Central Florida
Coalition Formation And Beamsteering Optimization For Directional Software-Defined Radios, Sayanta Seth
Graduate Thesis and Dissertation 2023-2024
Dynamic Spectrum Access (DSA), also known as Dynamic Spectrum Management, is the method of utilizing a set of spectrum techniques in real time to provide the ability to share wireless channels between Primary (or licensed) users (PUs) and Secondary (or unlicensed) users (SUs). The system is so designed that under normal circumstances, the PUs always get priority, but DSA enables the SUs to use the licensed bands as long as they do not create any interference on the PUs. Hence, the goal of utilizing the spectrum more efficiently can be achieved. Though DSA has been researched extensively as a new …
Investigation Of Dielectric And Mechanical Properties Of Lignocellulosic Rice Husk Fibril For High And Medium Voltage Electrical Insulation Applications,
2023
Department of EEE, Kongunadu College of Engineering and Technology, India
Investigation Of Dielectric And Mechanical Properties Of Lignocellulosic Rice Husk Fibril For High And Medium Voltage Electrical Insulation Applications, T. Rajamanikandan, S. Banumathi, B. Karthikeyan, R. Palanisamy, Mohit Bajaj, Hossam Zawbaa, Salah Kamel
Articles
The insulating material is made from rice husk and epoxy resin which are ecologically friendly and incredibly durable. When coarse Rice husk is mechanically disintegrated, fibrils are formed. By weaving together fibrillated threads, and robust biodegradables, lightweight dielectric fibers are created. Then the Composites are examined utilizing a blend of agave Rice husk fibers (10–35%) and an epoxy resin solution. The Chemical treatment of the Rice husk fibers increases the composites’ mechanical strength and electrical insulating properties. The tensile strength of Rice husk in epoxy composites is increased from 37.84 MPa to 48.32 MPa. The experimental results are compared using …
A Study On Peer-To-Peer Energy Trading Market In Low-Voltage Distribution Systems By Considering System Operation Criteria,
2023
Faculty of Engineering
A Study On Peer-To-Peer Energy Trading Market In Low-Voltage Distribution Systems By Considering System Operation Criteria, Pikkanate Angaphiwatchawal
Chulalongkorn University Theses and Dissertations (Chula ETD)
This dissertation investigates the challenges and proposes solutions for enhancing the efficiency and resilience of power systems through peer-to-peer (P2P) energy trading markets, focusing on the context of Thailand. It emphasizes assessing P2P energy transactions to prevent overloading of distribution lines and voltage fluctuations. The study proposes a method to determine the allowable maximum trading power (MTP) for sellers and buyers, considering the operating conditions of the distribution system and forecast error data of photovoltaic (PV) generation and load consumption and leveraging real-time data and algorithms to adjust trading power based on network constraints, ensuring power exchange does not affect …
Design And Development Of Industrial Internet Of Things For Multi-Cloud Factory Vehicle Monitoring System,
2023
Faculty of Engineering
Design And Development Of Industrial Internet Of Things For Multi-Cloud Factory Vehicle Monitoring System, Patchapong Kulthumrongkul
Chulalongkorn University Theses and Dissertations (Chula ETD)
Material handling equipment, such as forklifts, is broadly used in many industries to increase production efficiency. However, if the equipment unexpectedly breaks down, it can potentially interrupt manufacturing. It's beneficial for the industry to monitor equipment usage data in real-time so that engineers can identify faults before they occur. In this thesis, a prototype for a factory vehicle monitoring system has been designed and implemented. The proposed solution is to acquire real-time usage data from the motor drive of the factory vehicle and send the data to the cloud via narrowband IoT. The received real-time data streams can be stored …
Small Objects Detection In Aerial Imagery For System-On-Chip Fpgas,
2023
Faculty of Engineering
Small Objects Detection In Aerial Imagery For System-On-Chip Fpgas, Wimonthip Saenprasert
Chulalongkorn University Theses and Dissertations (Chula ETD)
Unmanned aerial vehicles (UAVs) offer significant advantages in accessing remote or high-risk locations. Yet, they also present challenges concerning privacy and safety. Effective air traffic management is crucial for ensuring compliance with security regulations. The primary objective is to monitor the flight trajectories of target objects in the airspace, necessitating efficient object detection, especially for distant objects, to facilitate surveillance and preparedness for addressing potential threats. However, the current performance of existing models in detecting small objects is inadequate for real-time surveillance applications. This study advocates prioritizing object detection over precise prediction of object bounding box sizes. We propose a …
Endoscopic Image Super-Resolution Algorithm Using Edge And Disparity Awareness,
2023
Faculty of Engineering
Endoscopic Image Super-Resolution Algorithm Using Edge And Disparity Awareness, Mansoor Hayat
Chulalongkorn University Theses and Dissertations (Chula ETD)
Integrating Stereo Imaging technology into endoscopic procedures marks a significant leap forward in medical imaging. This technology equips surgeons with enhanced depth perception and intricate views of internal structures, improving diagnostic accuracy and surgical precision. However, implementing stereo imaging in endoscopy presents certain challenges, such as low- resolution and blurred images that can compromise the quality of medical diagnoses and interventions. To address these issues, our research has developed a cutting-edge endoscopic image super-resolution model. This model incorporates a feature extraction module and a sophisticated cross-view feature interaction module, specifically designed to tackle the complexities of endoscopic images. It was …
Constructing Series, Parallel And Mixed Circuits With Lightbulbs And Analyzing Their Behaviors,
2023
Parkland College
Constructing Series, Parallel And Mixed Circuits With Lightbulbs And Analyzing Their Behaviors, Adaeze A. Eze
A with Honors Projects
This honors project was an experiment "to find out if the principles of a series, parallel and a mixed circuit still apply under the given condition (varying bulb resistance)."
An Investigation Of 3.5 Μm Emission In Er3+-Doped Fluorozirconate Glasses Under 638 Nm Laser Excitation,
2023
Shenzhen University, Shenzhen, China
An Investigation Of 3.5 Μm Emission In Er3+-Doped Fluorozirconate Glasses Under 638 Nm Laser Excitation, Haiyan Zhao, Ke Tian, Xin Wang, Dejun Liu, Shunbin Wang, Gerald Farrell, Pengfei Wang
Articles
Intense 3.5 μm mid-infrared emission has been achieved in Er3+-doped ZBYA glasses, which is ascribed to the Er3+: 4F9/2→4I9/2 transition. Based on the absorption spectrum of Er3+ ions, a 638 nm laser was utilized to directly pump the upper level (Er3+: 4F9/2) to achieve 3.5 μm emission with enhanced quantum efficiency. Spectroscopic parameters were predicted by Judd-Ofelt theory. The maximum emission cross-section of the Er3+-doped ZBYA glass was estimated to be 5.5×10-22 cm2 at 3496 nm. Additionally, the fluorescence spectra and energy level lifetimes of ZBYA glass samples with different Er3+ ions doping concentrations were also measured. The theoretical and …
Swarm Electrification: A Comprehensive Literature Review,
2023
Technological University Dublin
Swarm Electrification: A Comprehensive Literature Review, Stephen Sheridan, Keith Sunderland, Jane Courtney
Articles
In the global North, the need to decarbonize power generation is well documented and the challenges faced are endemic to the design of the electrical grids. With networks relying on centralized generation, it can be difficult to replace fossil-fuel power plants with renewable energy sources as generation may be intermittent causing grid instability when there is no ‘spinning reserve’ [1]. In parts of the global south, however, many under-electrified nations have high levels of solar irradiance. This, combined with falling prices for solar panels, is allowing for alternative paths to electrification from costly grid extensions and has resulted in grids …
H2020 Auto-Dan Project: Enhance The Participation Of The Community To Demand Response By Providing The State-Of-The-Art Technological And Policy Solution,
2023
Technological University Dublin, Ireland
H2020 Auto-Dan Project: Enhance The Participation Of The Community To Demand Response By Providing The State-Of-The-Art Technological And Policy Solution, Rene Peeren, Dharmesh Dabhi, John Dalton
Conference papers
The growing demand for electricity in Europe has increased the need for a more flexible and sustainable power system. In recent years, Demand Response (DR) has emerged as a promising solution to meet this need, by providing an opportunity for residential and smaller commercial consumers to actively participate in the electricity market. This research paper investigates the potential for DR among the residential community and small commercial electricity consumers in Europe and identifies the technological barriers and drivers that impact consumer engagement with DR programs in Europe. The different DR opportunities are identified and validated at the six different demo …
