48 research outputs found
Structure and Mutation Rate of SARS COVID-19 Virus
No full textThe world economy, society, and health have all been significantly impacted by the COVID-19 pandemic. This study aimed to investigate the importance of understanding the disease, its impact, and potential prevention measures. Our study analyzed the global spread and impact of COVID-19, highlighting the importance of understanding the disease to develop effective prevention measures. We analyzed epidemiological data and observed a significant increase in the number of cases and deaths globally. We identified common symptoms such as fever, cough, and shortness of breath, and we analyzed risk fac-tors such as age, underlying medical conditions, and immunosuppression. We also studied the transmission modes of COVID-19, including human-to-human transmission through respiratory droplets and contact with contaminated surfaces. Our study highlights the importance of prevention measures such as social distancing, mask-wearing, and hand hygiene in controlling the spread of COVID-19. We analyzed the effectiveness of these measures, which were implemented globally to prevent the spread of the virus. Our observations indicate that these measures, when combined, have reduced the spread of the virus and prevented millions of cases and deaths globally
Centrifugal forming and mechanical properties of silicone-based elastomers for soft robotic actuators
No full textThis thesis describes the centrifugal forming and resulting mechanical properties of silicone-based elastomers for the manufacture of soft robotic actuators. This process is effective at removing bubbles that get entrapped within 3D-printed, enclosed molds. Conventional methods for rapid prototyping of soft robotic actuators to remove entrapped bubbles typically involve degassing under vacuum, with open-faced molds that limit the layout of formed parts to raised 2D geometries. As the functionality and complexity of soft robots increase, there is a need to mold complete 3D structures with controlled thicknesses or curvatures on multiples surfaces. In addition, characterization of the mechanical properties of common elastomers for these soft robots has lagged the development of new designs. As such, relationships between resulting material properties and processing parameters are virtually non-existent. One of the goals of this thesis is to provide guidelines and physical insights to relate the design, processing conditions, and resulting properties of soft robotic components to each other. Centrifugal forming with accelerations on the order of 100 g’s is capable of forming bubble-free, true 3D components for soft robotic actuators, and resulting demonstrations in this work include an aquatic locomotor, soft gripper, and an actuator that straightens when pressurized. Finally, this work shows that the measured mechanical properties of 3D geometries fabricated within enclosed molds through centrifugal forming possess comparable mechanical properties to vacuumed materials formed from open-faced molds with raised 2D features.M.S.Includes bibliographical referencesby Parth Kulkarn
Characterization and optimization of UAV power system for aerial and submersible multi-medium multirotor vehicle
No full textEven as an emerging technology, Unmanned Aerial Vehicles (UAVs) have had a tremendous impact on the world. From the way wars are fought, to the way we take selfies, drones are well on their way to revolutionizing our daily lives. One of the most innovative applications of these vehicles in the Naviator submersible-UAV. This unique multirotor is capable of aerial flight and underwater operations with seamless Air-Water transitions. In this thesis, the power system of a multirotor UAS is characterized using standard performance models with the goal of designing and optimizing the systems of a new Naviator V5 prototype. Test beds were created to collect data on BLDC motors and propellers and their performance was assessed in air and water. Theoretical models using BEM theory and the 3-constant motor model were validated for their accuracy. Experiments found that RC air propellers are similarly efficient in air and water and BLDC motor performance is partially diminished due to the higher viscosity of water. The effects of input voltage, throttle, Kv rating, and motor size were also evaluated using motor torque curves. Using this data, an optimal power system for the Naviator V5 prototype was designed, tested, and evaluated.M.S.T.Includes bibliographical referencesby Parth V. Son
Evacuation of Kobylnice village in extraordinary event
No full textCílem této práce je sestavení evakuačního plánu pro obec Kobylnice. Teoretická část přibližuje problematiku mimořádných událostí a možných následků, zpracovává dostupnou literaturu a uvádí zákony a vyhlášky spojené s evakuačním plánováním. V praktické části se autor zmiňuje o programech, které jsou použitelné při mimořádných a krizových situacích a sestavuje plán evakuace.The aim of this work is evacuation plan setup for Kobylnice Corporation. The theoretical parth explains issue of extraordinary events and possible consequences, processes available information and shows the laws and public notices are being used in evacuative planning. In the practical parth author presents programs, which are applicability to extraordinary events and crisis situations. She draws a plan of evacuation.Institut bezpečnostních technologiíobhájen
Foundations of the law on industrial organisations in Russia and the former republics of the USSR: 1985-1990
No full textThe industrial organisations introduced into the law of the USSR from 1987, and thereafter
into the law of the former republics, developed upon a foundation that was rooted in Soviet
law and was constructed during the period from 1985 to mid-1990.
While this study focuses on the industrial economy, certain aspects of the agrarian economy,
and in particular the early history and structure of the collective farm, are considered where
appropriate.
The thesis presents an entirely new understanding both of the nature of these developments
and of the significance of the law on ownership. The foundations of the law on industrial
organisations are conceptualised within specific heuristic models which are elaborated in an
attempt to consolidate and highlight the key steps in this history. It is argued that Soviet law
did not contain a concept of the "generic owner" or a developed understanding of the
ownership of a juridical person, in particular by multiple owners holding "ownership
interests" of that juridical person; and that their absence critically impaired a rational and
coherent structure for the foundations of the law on industrial organisations both within the
Stalin economic settlement and the new economic constitution of 1990
Electrochemical screening and surface analysis of environmentally friendly corrosion inhibitors for aerospace aluminium alloy
No full textFor the past few decades, the aerospace industry has been actively looking for measures to tackle the problem of localized corrosion of aluminium alloy 2024-T3. One such measure was the use of hexavalent chromium salts as corrosion inhibitors. However, recent studies have reflected the environmental concerns and health impacts associated with these compounds. Since then, there has been a quest for alternatives that can be used as corrosion inhibitors for AA2024-T3. This thesis is aimed at studying these compounds by testing their inhibitive properties. Selecting an inhibitor from a set of compounds and recommending the best one is a crucial process. The research focuses on the screening of these inhibitors through various electrochemical techniques such as Potentiodynamic Polarisation(PDP), Linear Polarisation Resistance(LPR), and Electrochemical Impedance Spectroscopy(EIS). The electrochemical experiments during the first 24-hour exposure of AA2024-T3 to inhibitors exhibited that 2,5-Dimercapto-1,3,4-thiadiazole acts as a corrosion accelerator, while Na-Mercaptoacetate and Mercaptobenzimidazole showed the most inhibitive performance among the tested organic compounds. On monitoring their nature during 24 hours, it was observed that they show stable polarisation resistance values after 6 hours. Among the inorganics, Cerium compounds were seen to have better inhibitive properties than the Lithiumcompounds. Additionally, surface studies such as Fourier Transform Infrared Spectroscopy (FTIR) revealed the presence of thiol/mercaptan and carboxyl groups on samples exposed toNa-Mercaptoacetate. X-ray Photoelectron Spectroscopy (XPS) showed oxides of Cerium on samples exposed to Cerium Nitrate. Finally, the correlations between the inhibition efficiencies calculated from different electrochemical testing methods were illustrated using Pearson’s correlation method.Materials Science and Engineerin
Towards Designing Reliable and Efficient Millimeter-Wave Wireless LANS
No full textWith the increasing amount of mobile data and the demand for high data rates, current 2.4GHz/5GHz wireless local area networks (WLANs) are facing the problem of limited capacity. Millimeter-wave (mmWave) networks with gigahertz of channel bandwidth can provide multi-gigabit per second data rates, making it possible to support novel applications such as augmented/virtual reality (AR/VR), mobile offloading, high-resolution video streaming, etc. However, despite the potential, the directional nature of mmWave WLAN makes it prone to blockages and mobility. The dense deployment of Access Points (APs) brings unpredictable interference and non-negligible beamforming overhead. Moreover, current mmWave WLANs are application agnostic, resulting in inefficient usage of resources in supporting AR/VR type bandwidth-intensive applications. In this dissertation, I propose novel solutions to four key challenges, aiming to build practical, reliable, and efficient mmWave WLANs. Firstly, I explore a proactive blockage mitigation technique that utilizes joint transmissions of multiple APs to provide blockage resilience. Secondly, I characterize interference in dense mmWave WLANs and implement three interference mitigation techniques using commercial-off-the-shelf (COTS) devices. Thirdly, focusing on reducing the beamforming overhead, I propose a “Networked beamforming” model to reduce the number of APs that conduct beamforming in dense mmWave WLANs, resulting in significant improvements in network throughput. Lastly, I design novel solutions for blockage prediction and prefetching based on users’ six-degree-of-freedom (6DoF) position and orientation information to facilitate high-quality volumetric video streaming over mmWave WLANs.This work is embargoed by the author and will not be publicly available until 2024-08-31.2024-08-3
Design and analysis of an optical system to detect changes in the optical payload on a Cubesat
No full textUse of earth observation satellites have grown at a very high rate over the past few decades. On a closer observation of things around, most of them uses satellites, directly or indirectly. Satellites are being used in the day-to-day life without being aware of its application. Satellites are used for small things like weather report, communication to very large things like internet of things (IOT) and earth observation. Some CubeSats are also used for interplanetary missions. For the purpose of earth observation missions, the satellites are installed with an optical payload which is a camera. The cameras used for space are different from the regular camera and have special specifications in terms of the materials, components and the design which make them suitable for space missions. The optical payload which is to be launched has to be made sure that it can survive the launch and in orbit environment. This research focuses on the testing of these CubeSats and check if they are suitable for launch. The research starts with reviewing the testing procedure that is followed before the satellite is launched. A setup is provided for checking the performance of the camera mounted on the CubeSat and its suitability for launch. To investigate the performance of the camera, MTF and correlation techniques are used on different images to come to a conclusion.Opto MechatronicsMechanical Engineering | Mechatronic System Design (MSD
Synthesis and characterization of hydroxyapatite nanoparticles by chemical precipitation method for potential application in water treatment
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