Matching Items (29)

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High Efficiency Electronics for Space Applications

Description

The Metal Semiconductor Field Effect Transistor (MESFET) has high potential to enter analog and RF applications due to their high breakdown voltage and switching frequency characteristics. These MESFET devices could

The Metal Semiconductor Field Effect Transistor (MESFET) has high potential to enter analog and RF applications due to their high breakdown voltage and switching frequency characteristics. These MESFET devices could allow for high voltage analog circuits to be integrated with low voltage digital circuits on a single chip in an extremely cost effective way. Higher integration leads to electronics with increased functionality and a smaller finished product. The MESFETs are designed in-house by the research group led by Dr. Trevor Thornton. The layouts are then sent to multi-project wafer (MPW) integrated circuit foundry companies, such as the Metal Oxide Semiconductor Implementation Service (MOSIS) to be fabricated. Once returned, the electrical characteristics of the devices are measured. The MESFET has been implemented in various applications by the research group, including the low dropout linear regulator (LDO) and RF power amplifier. An advantage of the MESFET is that it can function in extreme environments such as space, allowing for complex electrical systems to continue functioning properly where traditional transistors would fail.

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  • 2015-05

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The Development of a Power System for the Phoenix CubeSat

Description

The Phoenix CubeSat is a 3U Earth imaging CubeSat which will take infrared (IR) photos of cities in the United Stated to study the Urban Heat Island Effect, (UHI) from

The Phoenix CubeSat is a 3U Earth imaging CubeSat which will take infrared (IR) photos of cities in the United Stated to study the Urban Heat Island Effect, (UHI) from low earth orbit (LEO). It has many different components that need to be powered during the life of its mission. The only power source during the mission will be its solar panels. It is difficult to calculate power generation from solar panels by hand because of the different orientations the satellite will be positioned in during orbit; therefore, simulation will be used to produce power generation data. Knowing how much power is generated is integral to balancing the power budget, confirming whether there is enough power for all the components, and knowing whether there will be enough power in the batteries during eclipse. This data will be used to create an optimal design for the Phoenix CubeSat to accomplish its mission.

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Date Created
  • 2017-05

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Physical Landscapes as Living Memories: A Case Study of Belgrade, Sarajevo, and Zagreb

Description

Buildings and monuments serve as a communal declaration of identity and as the physical landscape upon which memories are inscribed. Through its ability to concrete identity and capacity to reconstruct

Buildings and monuments serve as a communal declaration of identity and as the physical landscape upon which memories are inscribed. Through its ability to concrete identity and capacity to reconstruct the narratives of the past, public spaces and places have the structure of memory and serve as a fundamental aspect of cultural memory from which groups derive their identities. Beyond the social function of communal spaces, as a spatial claim architecture is a political expression of the territorial imperatives of the state. Consequently, both the political and social significance of physical spaces/places lead to the direct targeting of buildings, landscapes, and recognizable monuments in the processes of war.
As evidenced by the 1991-5 War in Bosnia, Croatia, and Serbia, culturally-relevant and internationally recognizable symbols of culture, like Stari Most in Bosnia and the Old Town of Dubrovnik, were destroyed with the purpose of manipulating the physical memories of the communities, thereby directly affecting the cultural identities of the communities residing there. As it stands, scholarship on the subject of memory in post-war areas has failed to consider the effects of space/place on memory, consequently failing to provide a viable theoretical framework to explain the interplay of space/place, memory, and identity. This paper is an effort to connect the current scholarship on memory, its function and effects on identity, with the realities of the physical environment in Bosnia, Croatia, and Serbia and their function of imposed confrontation, and thus recollection, of the War. The purpose of my thesis is to put city landscapes (private, uncrated memories) and museum narratives (public, curated memories) in communication to demonstrate how influential a factor space/place is in determining collective memory in a Balkan context. Cultural memory is at once incredibly vulnerable to reconstruction and massively determinate of group identity, thereby necessitating a deeper understanding of its determinant factors and the present uses of such factors.

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Date Created
  • 2020-05

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The Past, Present, and Future of NASA Research into Microbes in Space

Description

Space microbiology, or the study of microorganisms in space, has significant applications for both human spaceflight and Earth-based medicine. This thesis traces the evolution of the field of space microbiology

Space microbiology, or the study of microorganisms in space, has significant applications for both human spaceflight and Earth-based medicine. This thesis traces the evolution of the field of space microbiology since its creation in 1935. Beginning with simple studies to determine if terrestrial life could survive spaceflight, the field of space microbiology has grown to encompass a substantial body of work that is now recognized as an essential component of NASA' research endeavors. Part one provides an overview of the early period of space microbiology, from high-altitude balloon and rocket studies to work conducted during the Apollo program. Part two summarizes the current state of the field, with a specific focus on the revolutionary contributions made by the Nickerson lab at the Biodesign Institute at ASU using the NASA-designed Rotating Wall Vessel (RWV) Bioreactor. Finally, part three highlights the research I've conducted in the Nickerson lab, as well as continuing studies within the field of space microbiology.

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  • 2016-05

The Future of Energy: Space-Based Solar Power

Description

Space-based solar power is a renewable energy that is an alternative to all other forms of energy production. It takes on a new approach that pushes energy production off-world. Energy

Space-based solar power is a renewable energy that is an alternative to all other forms of energy production. It takes on a new approach that pushes energy production off-world. Energy is harnessed and beamed down to a ground receiver via microwaves which is then sent to the grid and distributed to people across the country, and even globe. While the technology is new and still in the research and development stages, the ability is there. An economic analysis of the various technology yields levelized costs of energy comparable to current prices—under $.10/kWh. The markets and profits for this type of technology are abundant, ranging from commercial to military uses, with profits in the millions to billions of dollars. The environmental impacts are low compared to current energy production methods. The potential is great, the technology is close, and the future is near.

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Date Created
  • 2020-05

Spacebound: Exploring Outer-Space One Step at a Time

Description

Spacebound is a mobile application that helps people understand astronomical distances by converting their distances walked on Earth to an interstellar scale. To better navigate outer space, the app presents

Spacebound is a mobile application that helps people understand astronomical distances by converting their distances walked on Earth to an interstellar scale. To better navigate outer space, the app presents predefined distance scales and journeys with various objects (planets, asteroids, stars) to explore. Spacebound hopes to be a gamified approach for exploring outer space and also an educational app where the user can learn more about objects as they visit them.

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Date Created
  • 2021-05

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Lunar Rover Navigation: Impact of Illumination Conditions on AI and Human Perception of Crater Sizes

Description

When rover mission planners are laying out the path for their rover, they use a combination of stereo images and statistical and geological data in order to plot a course

When rover mission planners are laying out the path for their rover, they use a combination of stereo images and statistical and geological data in order to plot a course for the vehicle to follow for its mission. However, there is a lack of detailed images of the lunar surface that indicate the specific presence of hazards, such as craters, and the creation of such crater maps is time-consuming. There is also little known about how varying lighting conditions caused by the changing solar incidence angle affects perception as well. This paper addresses this issue by investigating how varying the incidence angle of the sun affects how well the human and AI can detect craters. It will also see how AI can accelerate the crater-mapping process, and how well it performs relative to a human annotating crater maps by hand. To accomplish this, several sets of images of the lunar surface were taken with varying incidence angles for the same spot and were annotated both by hand and by an AI. The results are observed, and then the AI performance was rated by calculating its resulting precision and recall, considering the human annotations as being the ground truth. It was found that there seems to be a maximum incidence angle for which detect rates are the highest, and that, at the moment, the AI’s detection of craters is poor, but it can be improved. With this, it can inform future and more expansive investigations into how lighting can affect the perception of hazards to rovers, as well as the role AI can play in creating these crater maps.

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Date Created
  • 2021-05

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Creating Reliable Software Systems for the DORA CubeSat

Description

CubeSats can encounter a myriad of difficulties in space like cosmic rays, temperature<br/>issues, and loss of control. By creating better, more reliable software, these problems can be<br/>mitigated and increase the

CubeSats can encounter a myriad of difficulties in space like cosmic rays, temperature<br/>issues, and loss of control. By creating better, more reliable software, these problems can be<br/>mitigated and increase the chance of success for the mission. This research sets out to answer the<br/>question: how do we create reliable flight software for CubeSats? by providing a concentrated<br/>list of the best flight software development practices. The CubeSat used in this research is the<br/>Deployable Optical Receiver Aperture (DORA) CubeSat, which is a 3U CubeSat that seeks to<br/>demonstrate optical communication data rates of 1 Gbps over long distances. We present an<br/>analysis over many of the flight software development practices currently in use in the industry,<br/>from industry leads NASA, and identify three key flight software development areas of focus:<br/>memory, concurrency, and error handling. Within each of these areas, the best practices were<br/>defined for how to approach the area. These practices were also developed using experience<br/>from the creation of flight software for the DORA CubeSat in order to drive the design and<br/>testing of the system. We analyze DORA’s effectiveness in the three areas of focus, as well as<br/>discuss how following the best practices identified helped to create a more reliable flight<br/>software system for the DORA CubeSat.

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Date Created
  • 2021-05

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A Survey of Modern Gridded Ion Propulsion Systems and Their Development and Applications in Future Space Missions

Description

This paper studies the history and development of ion propulsion systems and survey past, present, and developing technology with their applications to space missions. This analysis addresses the physical design

This paper studies the history and development of ion propulsion systems and survey past, present, and developing technology with their applications to space missions. This analysis addresses the physical design parameters and process that is a part of designing and optimizing a gridded ion thruster. It also identifies operational limits that may be associated with solar-powered ion propulsion systems and posits plausible solutions or alternatives to remedy such limitations. These topics are presented with the intent of reviewing how ion propulsion technology evolved in its journey to develop to today's systems, and to facilitate thought and discussion on where further development of ion propulsion systems can be directed.

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Date Created
  • 2018-05

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The Future of Space with Respect to International Relations

Description

The emergence of the space industry facilitated new technologies which completely changed how humans live. However, the industry itself has also acted as a constant source of conflict between its

The emergence of the space industry facilitated new technologies which completely changed how humans live. However, the industry itself has also acted as a constant source of conflict between its participants. As a result, the industry has encountered issues regarding the role of private industry in space development, the militarization of space, how to address the gap in space technology between developed and underdeveloped nations, and the overall economic climate of space. With these numerous challenges facing the space industry, this investigation hopes to present potential solutions to said issues while providing a baseline for future research. In order to accomplish this, the international relations ideologies of neorealism, neoliberalism and constructivism were applied in conjunction with opinions from multiple industry scholars to synthesize potential solutions and provide a knowledge baseline and methodology for future investigations. This resulted in the conclusion that, in the scope of this investigation, a constructivist solution focusing on human nature's role in international relations is the best means of avoiding global conflict while promoting prosperity. The proposed constructivist solution proposes the development of multi-actor groups which defend, maintain and develop space assets collectively. These groups formed around ideological similarities would effectively limit conflict and increase the viability of space. However, this constructivist approach is not satisfactory due to its complexity which could result in the breakdown of peace and prosperity if interdependence between actors cannot be maintained. As a result, more research is necessary to develop an appropriate solution but, the methodology, information and understanding of different international relations principles used in this thesis can be used in future investigations to develop more comprehensive solutions.

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  • 2017-05