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A Framework to Unveil Design Decisions in Ecological Urbanism
Get PDFEcological urbanism offers a framework for landscape architecture to address the challenges posed by dynamic infrastructure projects in the face of changing climates and human impacts. As Nature-based Solutions (NbS) become more prevalent, the role of aesthetics in these solutions becomes increasingly important. However, there has been a lack of systematic approaches to assess the design aesthetics of landscape architecture in practice. This study aims to fill this gap by providing a rapid assessment framework tailored for landscape architecture practitioners. Drawing from the concepts of regenerative design and ecological urbanism, the framework comprises three sections: Ecological Function (EFx), Anthropocentric Function (AFx), and Anthropocentric Form (AFm), supported by 27 categories of metrics. The pilot test of this assessment tool on three diverse water-based infrastructure projects in urban and peri-urban environments demonstrates its applicability and effectiveness. The results indicate that the rapid assessment can evaluate projects through the lenses of ecological and anthropocentric functionality, as well as form, with assessors attributing similar scores to respective projects. The categorical phrasing of the metric descriptions seems suitable for landscape architecture practitioners, with most assessments completed within the desired timeframe. This study contributes novel insights by proposing form-based metrics to complement existing functionality metrics, recognizing the importance of aesthetics in the success of nature-based solutions and infrastructure for regenerative urban systems
Verification of the Pointing Accuracy and Field of View of the X-Ray Detectors Onboard the 6U CubeSat X-Ray Observatory NinjaSat
Get PDFOpen-Source CubeSat Solar Panels: Design, Assembly, Testing, and On-Orbit Demonstration
Get PDFCube satellites, or CubeSats, are small satellites commonly used to perform Earth imaging and on-orbit scientific experiments. CubeSats are often powered using expensive, inflexible commercial-off-the-shelf solar panels, largely due to a lack of flight-qualified open-source alternatives. Here, we describe the design of customizable, deployable solar panels, offering an open-source, cost-effective alternative. Towards a fully open-source CubeSat, our designs have mission-tailored power generation capabilities and simple electrical and mechanical integration. The solar panel designs were demonstrated on-orbit on three satellites in the Northern SPIRIT constellation and will be on AlbertaSat’s Ex-Alta 3 satellite, which will launch in 2025. The design files, assembly procedures, and best practices will be open-source-published online. This work lowers the barrier of entry into space, making satellite design easier and less expensive - students helping students design better satellites
SpEye – Space Eye
Get PDFSpace Eye (SpEye) is a two-satellite technology (Free Flyer and Carrier Target) demonstration mission for the in-flight validation of critical technologies and techniques related to advanced on-orbit inspection and formation-flying techniques, applicable to future operational nano-satellite capabilities and operations
Oscillating Heat Pipe Enabled Radiators
Get PDFWhat is an Oscillating Heat Pipe (OHP)?
A passive high performance heat transfer device that can be manufactured in thin ( \u3c 4 mm) and structural members (aluminum, copper). A radiator effective thermal conductivity can be \u3e 10,000 W/mK
Optimal Control Design of Rotation Floating Space Robot During Grasping Operation: An RL Approach
Get PDFThis poster introduces an innovative model-free learning-based controller designed to comprehensively control an orbiting space robot engaged in proximity and grasping operations. Proximity control techniques are crucial for space robots, specifically robotic manipulators on a floating satellite base, facilitating tasks like in-orbit servicing and debris grasping. Traditional controllers need help managing these robots\u27 coupled motion due to the satellite base\u27s floating nature. While conventional controllers have been utilized for coupled control in nonlinear systems, their complexity increases with the growing degrees of freedom in the robot. In contrast, Model-free Reinforcement Learning (RL) has successfully mastered intricate policies within robotic manipulation. However, existing research has predominantly focused on controlling the space robotic arm, neglecting the satellite base. This poster addresses the vent by proposing a coupled controller for the space robotic arm and the satellite base orientation. This simultaneous control is essential for ensuring the proper functioning of onboard sensors and equipment with specific pointing requirements. The Proximal Policy Optimization (PPO) algorithm is employed in this study to control the position (3 DOF) and orientation (3 DOF) of the end-effector while also managing the orientation of the satellite base (3 DOF). To the best of the authors\u27 knowledge, this paper marks the first application of a model-free RL method for the simultaneous 9 DOF control of a floating space robot. Furthermore, the paper proposes enhancements to standard reward functions in RL algorithms to enhance the learning algorithm\u27s performance. The policy training is executed using a Pybullet framework environment, and the paper presents a trained policy performance of a rotation floating space robot at standard reward functions
EEETester: Development of CubeSat Platform for Space Heritage of Korean Manufactured Electrical, Electronics, and Electromechanical Part
Get PDFIdea for Estimating Underground Water Levels at Peatlands in Sarobestsu, Hokkaido and Central Kalimantan, Indonesia by Using Multi-Spectral Sensors for Development Small Satellite Observation System
Get PDFThe authors\u27 team has a five-year-project to develop multi-spectral sensors which can be loaded on small satellites and drones for the Earth observation since April 2023. Those sensors would be able to cover wavelengths between near infrared (around 1 µm) and middle wave infrared (around 5 µm). The authors main target in the project is to establish use cases. Peatland is a unique target for the multi-spectral sensors. Drainage systems have serious effects on decreasing underground water levels at the tropical peatland forests. The decreasing underground water levels leads encouraging microbial degradative activities and forest fires, and emissions of greenhouse gas (GHG) are huge impacts on climate change. Emissions of GHG could be controlled when appropriate monitoring and managing systems for underground water levels are established. Moreover, those systems could contribute Japanese companies to earn carbon credits. With those reasons, the authors work on development of estimation models for underground water levels through the observation of peatland vegetations by multi-spectral sensors. In 2023, the authors worked on 2 things: the first was researches on spectral features of vegetations on peatlands and relationships between water contents in soil and underground water levels; and the second was observation site selections. Water is raised by water potentials among atmosphere, leaves, roots and soil. Underground water levels are decreased because absorptions by vegetations and supplying water to rhizosphere soil. Also, underground water levels are recovered by rainfalls. Recovering systems by rainfalls have hysteresis, and the process is complicated although tank model was established for simulating the mechanisms of underground water level recovery. Site selections were also important activities to monitor seasonal changes of vegetations and underground water levels. The authors set 6 steps for the site selection: security at the sites; accessibility to the sites; vegetations which have correlations with underground water levels; stable weather conditions; cooperation with local institutions, and field survey. Sarobetsu and Central Kalimantan, Indonesia were selected. Sarobetsu is located at Hokkaido, and it is designated as the National Park. Unique sphagnum covers the peatland at Sarobetsu, and it is expected to be an indicator for estimation of underground water levels. Central Kalimantan is located at the tropical rainforest region, and deep peat layers are known to cover the lands. Authors installed the equipment and began to observe the underground water levels, water contents in soils, and vegetation layers at Sarobetsu in August 2023. Same equipment would be installed at three locations in Central Kalimantan in March 2024. The authors spent for the research on the peatland environment and the preparation for the observation in 2023. Those activities which could clarify the environment of the peatlands were necessary for developing the algorithms to estimate underground water levels by multi-spectral observation on peatland vegetations. The multi-spectral sensors are now under the developments, and the authors would use existing spaceborne and drone multi-spectral sensors for clarifying the correlations between vegetations and underground water levels as the next steps
Concept Design of 50-kg Class Satellite \u27INSPIRE\u27: On-Orbit Demonstration of Orbit Control and Formation Flight by Atmospheric Drag Using Variable Shape Function
Get PDFTokyo Institute of Technology and Waseda University are developing a 50-kg class satellite, tentatively named INSPIRE and now officially named GRAPHIUM. The scientific mission of this satellite is to observe gamma rays from the galactic plane, solar flares, lightning, and auroras using the Compton Camera. On the other hand, the satellite aims to accomplish advanced engineering missions. It is to demonstrate orbit control and formation flight by atmospheric drag force using the variable shape function
Simultaneous Filament Winding and In Situ Potting of Custom High-Temperature Electromagnets (HTEM) for Space Electric Propultion Applications
Get PDFElectric propultion that uses electrical energy to accelerate ionized propellant and delivers very high specific impulse is the leading propultion solution for long-duration space missions