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Time Dependent Orienteering Problem With Time Windows And Service Time Dependent Profits, M. Khodadadian, A. Divsalar, C. Verbeeck, Aldy GUNAWAN, P. Vansteenwegen 2022 Singapore Management University

Time Dependent Orienteering Problem With Time Windows And Service Time Dependent Profits, M. Khodadadian, A. Divsalar, C. Verbeeck, Aldy Gunawan, P. Vansteenwegen

Research Collection School Of Computing and Information Systems

This paper addresses the time dependent orienteering problem with time windows and service time dependent profits (TDOPTW-STP). In the TDOPTW-STP, each vertex is assigned a minimum and a maximum service time and the profit collected at each vertex increases linearly with the service time. The goal is to maximize the total collected profit by determining a subset of vertices to be visited and assigning appropriate service time to each vertex, considering a given time budget and time windows. Moreover, travel times are dependent of the departure times. To solve this problem, a mixed integer linear model is formulated and a ...


Unconventional Water Resources: Global Opportunities And Challenges, Zahra Karimidastenaei, Tamara Avellán, Mojtaba Sadegh, Bjørn Kløve, Ali Torabi Haghighi 2022 University of Oulu

Unconventional Water Resources: Global Opportunities And Challenges, Zahra Karimidastenaei, Tamara Avellán, Mojtaba Sadegh, Bjørn Kløve, Ali Torabi Haghighi

Civil Engineering Faculty Publications and Presentations

Water is of central importance for reaching the Sustainable Development Goals (SDGs) of the United Nations. With predictions of dire global water scarcity, attention is turning to resources that are considered to be unconventional, and hence called Unconventional Water Resources (UWRs). These are considered as supplementary water resources that need specialized processes to be used as water supply. The literature encompasses a vast number of studies on various UWRs and their usefulness in certain environmental and/or socio-economic contexts. However, a recent, all-encompassing article that brings the collective knowledge on UWRs together is missing. Considering the increasing importance of UWRs ...


Energy Intensity Of Human Transportation, William Lubitz 2022 University of Guelph

Energy Intensity Of Human Transportation, William Lubitz

Windsor Turbulence and Energy Lab

Humans are a mobile species, and transportation technology has been one of the primary enablers of our current shared, globally-connected society. Transportation is also one of the largest categories of human energy use, and this energy use correlates with a diverse range of environmental impacts. Different modes of transportation have different energy intensities, with increasing speed being associated with greater energy intensity. This study reviews the fundamental relationships and energy requirements of human-powered and wheeled ground transportation. Relevant data for modeling energy efficiency of walked, running and wheeled transport in the context of engineering design are compiled and presented. It ...


Engineering: Cleaning Water, Producing Food, Building Shelters, Graham T. Reader Dr. 2022 University of Windsor

Engineering: Cleaning Water, Producing Food, Building Shelters, Graham T. Reader Dr.

Windsor Turbulence and Energy Lab

Human survival requires that we drink water, eat food, breath sufficiently oxygenated air, and enjoy a safe shelter. Historically, shelter was perhaps the most important since, as hunter-gathers, wild animals, fish, and uncultivated plants provided the food sources while rivers, streams, lakes, and surface pools supplied the drinking water. Shelter protected against the vagaries of weather, climate, and possible animal attacks, including other humans. In the provision of these needs, artisans, skilled trades, technicians, and engineers have played pivotal roles since erect human beings first populated the Earth. In a global survey seven out of ten people think engineers’ societal ...


Influence Of Admixtures On The Performance Of Soundless Chemical Demolition Agents And Implications For Their Utilization, Nattamon Maneenoi, Raphael Bissen, Sakonvan Chawchai 2022 Carleton College, Department of Geology, Northfield, Minnesota, 55057, USA

Influence Of Admixtures On The Performance Of Soundless Chemical Demolition Agents And Implications For Their Utilization, Nattamon Maneenoi, Raphael Bissen, Sakonvan Chawchai

Journal of Sustainable Mining

Soundless Chemical Demolition Agents (SCDAs) are an environmentally friendly and safer alternative to traditional rock fragmentation methods. Admixtures are used to change the rheological properties and performance of SCDAs. This study aimed to investigate the effect of various concentrations of chemical accelerators (chloride salts) and viscosity enhancing agents (VEAs: Xanthan gum, Guar gum, and Gellan gum) on the fracture onset compared to an unmodified SCDA (BRISTAR 100®). All experiments were conducted on Portland Type 1 (OPC 1) cement blocks. The flowability of the mixtures was determined by mini-slump tests. Results show that 4wt% MgCl2 and 3wt% CaCl2 have accelerated the ...


Film Cooling In Gas Turbine And Nozzle, Manideep Uduta Engineer-Graduate Aerospace, Vaibhav Naiknavre Engineer-Graduate Aerospace 2022 Sandip University, Maharashtra, Nashik, INDIA

Film Cooling In Gas Turbine And Nozzle, Manideep Uduta Engineer-Graduate Aerospace, Vaibhav Naiknavre Engineer-Graduate Aerospace

Graduate Research in Engineering and Technology (GRET)

A gas turbine is a rotating engine that generates its power through the flow of combustion gases. With either an axial or centrifugal compressor, air from the surrounding environment is drawn into the engine intake, where it is compressed and heated before being sent to combustion chamber. Every gas turbine engine has a nozzle as a standard part. Among its many responsibilities include propelling the engine forward, returning exhaust gases to the free stream, and regulating mass flow through the engine. When the power turbine's exhaust exits, the nozzle is directly in the direction of the fumes. Simply put ...


Machine Learning Applications To Static Timing Analysis, Waseem Mohamed Raslan 2022 American University in Cairo

Machine Learning Applications To Static Timing Analysis, Waseem Mohamed Raslan

Theses and Dissertations

Modeling complex cell behavior is critical for accurate static timing analysis. Effective current source model, ECSM, and composite current source, CCS, waveform data compression became a necessity to reduce the size of technology files and increase the accuracy of the cell characterization data. We used deep learning nonlinear Autoencoders to compress voltage and current waveforms and compared them with singular value decomposition, SVD, approach. Autoencoders gave ~1.67x compression ratio for voltage waveforms better than SVD approach and gave 45x to 55x better compression ratio compared to other lossless techniques like bz2 and gzip. Autoencoders achieved ~1.7x compression ratio ...


Legal Characterization Of The Challenges Faced By The Construction Industry During Covid-19 And Devaluation Of The Egyptian Pound, Riham Abuzaid 2022 American University in Cairo

Legal Characterization Of The Challenges Faced By The Construction Industry During Covid-19 And Devaluation Of The Egyptian Pound, Riham Abuzaid

Theses and Dissertations

With all the challenges this past decade has inflicted on the economy on a global scale, Egypt had its share with two major events, starting with the Egyptian pound devaluation against the U.S dollar in 2016 and currently the emergence of the COVID-19 pandemic. These major events instigated the interference of the legal/contractual sectors in the construction market to find solutions that range from agreeable to stringent to protect the assets of their beneficiaries.

Both events are impactful and require extensive analysis to determine and classify each situation. This thesis addresses the implementation of standard internationally acknowledged legislative ...


Noncontact Liquid Crystalline Broadband Optoacoustic Sensors [U.S. Patent Us11366054b2], Hengky Chandrahalim, Michael T. Dela Cruz 2022 Air Force Institute of Technology

Noncontact Liquid Crystalline Broadband Optoacoustic Sensors [U.S. Patent Us11366054b2], Hengky Chandrahalim, Michael T. Dela Cruz

Faculty Publications

An optoacoustic sensor includes a liquid crystal (LC) cell formed between top and bottom plates of transparent material. A transverse grating formed across the LC cell that forms an optical transmission bandgap. A CL is aligned to form a spring-like, tunable Bragg grating that is naturally responsive to external agitations providing a spectral transition regime, or edge, in the optical transmission bandgap of the transverse grating that respond to broadband acoustic waves. The optoacoustic sensor includes a narrowband light source that is oriented to transmit light through the top plate, the LC cell, and the bottom plate. The optoacoustic sensor ...


Experimental And Computational Investigation Of Divergent Thrust Losses In Rocket Nozzles, Vaibhav Arya Graduate Engineer, Anushka Sunil Kapse Post Graduate Student 2022 Sandip University, MH, INDIA

Experimental And Computational Investigation Of Divergent Thrust Losses In Rocket Nozzles, Vaibhav Arya Graduate Engineer, Anushka Sunil Kapse Post Graduate Student

Graduate Research in Engineering and Technology (GRET)

The nozzle is a critical component of any rocket engine because it transforms high pressure and high temperature (with sluggish net velocity) within the combustion chamber into high velocity but low pressure. Individually, the molecules in the mixed propellants have rapid velocity in the combustion chamber, but directions are randomly pointing in all directions. A convergent-divergent nozzle, also known as a CD nozzle, is fashioned like a tube with two bulging ends and a thin part in the center. This structure/design provides the nozzle with a balanced shape. By turning the flow's heat energy into kinetic energy, the ...


A Study On Concepts De-Laval Nozzle Using Cfd Tool, Krishna Yadav Graduate Engineer, Digambar Daware Mr., Vedant Akolkar, Pallavi Padalwar 2022 Department of Aerospace Engineering Sandip University

A Study On Concepts De-Laval Nozzle Using Cfd Tool, Krishna Yadav Graduate Engineer, Digambar Daware Mr., Vedant Akolkar, Pallavi Padalwar

Graduate Research in Engineering and Technology (GRET)

A device that is used to control the characteristics of fluid is known as a nozzle. Its primary function is to increase the fluid's rate of motion. A traditional De-Laval nozzle will have three distinct parts: a throat, a converging section, and a diverging part. This paper will attempt to detail the bulk of the nozzle concepts developed by De Laval. This paper provides a comprehensive analysis of the nozzle's operational philosophy. In addition, theoretical flow analysis is carried out at a number of locations along the length of the nozzle. The dynamic changes in flow parameters such ...


Two Dimensional Cfd Analysis On Different Rocket Nozzles, Yogesh Bhawarker Mr., Digambar Daware Mr., Krishna Yadav, Vedant Akolkar, Pallavi Padalwar, Prakash Katdare 2022 Department of Aerospace Engineering, Sandip University, SOET, NASHIK, MH

Two Dimensional Cfd Analysis On Different Rocket Nozzles, Yogesh Bhawarker Mr., Digambar Daware Mr., Krishna Yadav, Vedant Akolkar, Pallavi Padalwar, Prakash Katdare

Graduate Research in Engineering and Technology (GRET)

The reduction of Earth-to-orbit launch costs in conjunction with an increase in launcher reliability and operational Efficiency is the key demands on future space transportation systems, like single-stage-to-orbit vehicles (SSTO). The realization of these vehicles strongly depends on the performance of the engines, which should deliver high performance with low system complexity. Performance data for rocket engines are practically always lower than the theoretically attainable values because of imperfections in the mixing, combustion, and expansion of the propellants. The main part of the project addresses different nozzle concepts with improvements in performance as compared to conventional nozzles achieved by Different ...


Cfd Analysis Of Nozzle Flow With Sudden Expansion In Aerospace Engineering, Yogesh Bhawarker Mr., Ritik Patidar, Prakash Katdare 2022 Department of Aerospace Engineering, Sandip University, SOET, NASHIK, MH

Cfd Analysis Of Nozzle Flow With Sudden Expansion In Aerospace Engineering, Yogesh Bhawarker Mr., Ritik Patidar, Prakash Katdare

Graduate Research in Engineering and Technology (GRET)

As the need for missiles and rockets has increased exponentially, the challenges associated with the gas dynamics of these vehicles continues to be a concern. The pressure in the downstream is sub atmospheric whenever there is a sudden expansion. This low pressure in the recirculation zone causes significant drag, accounting for almost two-thirds of the net drag of the aerospace vehicles. Hence, the purpose of this paper is to deliver a Computational Fluid Dynamic (CFD) analysis of the impact geometry and flow parameters have on the thrust force generated by the flow from convergent divergent nozzles to a suddenly expanded ...


Hybrid Rocket Propulsion Development And Application, AKSHAY GHARAT Assistant Professor, VINAYAK HASTAK Graduate Engineer 2022 SOET, Sandip University, MH, INDIA

Hybrid Rocket Propulsion Development And Application, Akshay Gharat Assistant Professor, Vinayak Hastak Graduate Engineer

Graduate Research in Engineering and Technology (GRET)

Satellite technology is advancing. Satellite propulsion requires several desired rocket properties. This is necessary for 1 kg of payload. Launch vehicles no longer need rocket engines. Application includes satellite movement, orbit transfer, and probe and lander propulsion. Space travel is inventive and exciting.

Research, production, and use costs must be decreased to make space transportation systems generally available. Security shouldn't be affected. Rocket propellants must be high-performing, non-toxic, and safe. Rocket engines have other parts. Restarting and throttling are crucial. These are inaccessible to solid rocket motors. Developing a liquid rocket engine is hard and expensive, but it can ...


Engine Performance On Atomization Of Fuel Injector: A Review, Ankit Patil Er., Akshay C. Bedke Er., Vedant A. Deshmukh Er., Pratiksha Y. Shevare Er. 2022 Department of Aerospace Engineering, SOET, Sandip University, Nashik, INDIA

Engine Performance On Atomization Of Fuel Injector: A Review, Ankit Patil Er., Akshay C. Bedke Er., Vedant A. Deshmukh Er., Pratiksha Y. Shevare Er.

Graduate Research in Engineering and Technology (GRET)

The impact of the fuel injection of fuel atoms on engine performance has been investigated to improve fuel efficiency and waste disposal features. The fuel swirl method for injection atomization was evaluated both by the analysis of the fuel flow and the sample test. The goal of the paper is to establish good fuel atomization over the range of engine performance. As a result of our studies, it has been concluded that the desired atomization can be achieved when gasoline is thrown into a circular motion. Fuel spray and atomization features play an important role in the performance of internal ...


Thrust Generation By Ion Propulsion Technology, Vishal Kaushik Prof., Raghav M. Katwale Mr., Dhiraj N. Sakore Mr. 2022 Assistant Professor Department of Aeronautical Engineering, Priyadarshini College of Engineering, Nagpur, Maharashtra

Thrust Generation By Ion Propulsion Technology, Vishal Kaushik Prof., Raghav M. Katwale Mr., Dhiraj N. Sakore Mr.

Graduate Research in Engineering and Technology (GRET)

Electric propulsion system proven to be a suitable and efficient alternative for conventional propulsion systems .Ion thrusters is one of the electric propulsion systems. It has very high specific impulse generation (Isp) and consumes very low amount of fuel. Ion thrusters can easily compete with chemical rockets propulsion, even if the thrust produce is very low compares to chemical propulsion. Ion propulsion system can be used for various space missions like orbit station keeping for geostationary satellite, orbit and altitude controlling, multi-goal missions. Ion thrusters are more compatible for deep space missions as they are tested for endurance test where ...


A Critical Study On Missile And Missile Guidance, Jay Vavdiya Engineer, Vishal Kaushik Prof. 2022 Department of Aerospace Engineering, Sandip University, Nashik, Maharashtra

A Critical Study On Missile And Missile Guidance, Jay Vavdiya Engineer, Vishal Kaushik Prof.

Graduate Research in Engineering and Technology (GRET)

As a result of advancements in armament technology, traditional conceptions of battle are going through a profound transformation. The use of technology as a force multiplier is extremely prevalent in modern combat. In the modern battlefield, autonomous weapons are absolutely necessary. In this day and age, the presence of missiles is almost always indicative of a country's level of military power. The employment of guided weapons is an unavoidable need in the arsenals of modern militaries. The study will primarily concentrate on several types of weapons, ranging in range from extremely short to medium, long, and automated. This study ...


Missile Materials, Pranjali Pandurang Sankpal Engineer-Graduate, Varun Vourganti Dr. 2022 Aerospace Engineering, Sandip University, Maharashtra, INDIA

Missile Materials, Pranjali Pandurang Sankpal Engineer-Graduate, Varun Vourganti Dr.

Graduate Research in Engineering and Technology (GRET)

The development of missile materials is the key to indigenous materials and their components. The selection of materials includes some the properties such as high strength to weight ratio, easy fabrication, good corrosion resistance, reliable quality, and high fracture toughness. The materials used for the airframe and propulsion system are alloys of aluminum, titanium, magnesium, and maraging steel. Non-metallic materials are also used such as carbon-carbon composites and polymer materials. High purity materials like phosphorous, and silicon are also important for material advancements. The paper outlines the needs and challenges of research and its solutions.


Film Cooling Method In Liquid Rocket Engine, Pradnya Cherkupalli Engineer Graduate, Juluru Sandeep Prof. 2022 Department of Aerospace Engineering, Sandip University, Nashik, Maharashtra, INDIA

Film Cooling Method In Liquid Rocket Engine, Pradnya Cherkupalli Engineer Graduate, Juluru Sandeep Prof.

Graduate Research in Engineering and Technology (GRET)

Design Criteria, Experimental Studies of Supersonic Shock Wave Interaction with Film Cooling, and High-Pressure Subscale Combustion Chamber of Film Cooling Liquid-Propellant Rocket Engines are all covered in this review study. Using earth-storable, space-storable, and cryogenic propellant combinations, the study establishes the applicability of film cooling to rocket engines in the high thrust range. The study's findings are given in this publication. Additionally, data from studies mixing different types of propellant were used to evaluate the analytical model's accuracy. Tests employing supersonic film cooling were done in the wind tunnel to investigate the impact of external shock waves on ...


Aerospace Components Made By Polymer Material, Minal Babar Graduate Engineer, Priyansh Saxena Graduate Engineer, Nilesh Vilash Thube Graduate Engineer, GOKUL RAJ S Engineering Graduate 2022 Department of Aerospace Engineering, Sandip University, MH, INDIA

Aerospace Components Made By Polymer Material, Minal Babar Graduate Engineer, Priyansh Saxena Graduate Engineer, Nilesh Vilash Thube Graduate Engineer, Gokul Raj S Engineering Graduate

Graduate Research in Engineering and Technology (GRET)

The aerospace and aviation industry have fasted growing industries on a global scale. Reliable aircraft demands many top rubber components. These rubber components must-have high performance and endurance properties, since they will be exposed to a range of extreme weather conditions, such as excessively hot or cold temperatures, and different types of oils and gases. Rubber products are becoming more famous because of their durability under extreme environmental conditions and cost-effectiveness. The rubber used for aircraft must be of high quality, and this factor is most important in the production of the necessary parts. To study the effect of all ...


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