Digital Commons Network^™

Philosophy And Myth In Karl Marx, Robert C. Tucker

Hannah Arendt Marginalia - All

Cambridge, University Press, 1961

Call #: B3305.M74 T8 1961

Contains marginalia, underlining, marginal lining and notes on pages 264-265

PDF Information: 89 pages – 49.6mb

The Tax Adviser, Volume 9, Number 8, August 1978, American Institute Of Certified Public Accountants

Tax Adviser

No abstract provided.

Effect Of Informal Marital Separations On Personal Income Taxation, Carol S. Bruch

Tax Adviser

No abstract provided.

Selections, Benedictus De Spinoza

Hannah Arendt Marginalia - All

New York, Chicago, C. Scribner’s sons, c 1930

Call #: B3958 .W5

Contains underlining, marginal lining and endpaper notes.

PDF Information: 57 pages – 35 MB

After Babel, George Steiner

Hannah Arendt Marginalia - All

New York : Oxford University Press, 1975

Call #: P306 .S66 1975

Contains underlining, marginal lining and endpaper notes.

PDF Information: 67 pages – 25 MB

Natural Right And History, Leo Strauss

Hannah Arendt Marginalia - All

Chicago, University of Chicago Press, 1953

Call #: JC571 .S77

Contains marginalia, underlining and marginal lining

PDF Information: 107 pages – 20.7mb

On Tyranny, Leo Strauss

Hannah Arendt Marginalia - All

New York, Free Press of Glencoe, 1963

Call #: PA4494.H6 S8 1963

Contains marginalia, underlining and marginal lining.

PDF Information: 44 pages – 19.6mb

The Chief Works Of Benedict De Spinoza, V.1, Benedictus De Spinoza

Hannah Arendt Marginalia - All

New York : Dover, 1955, c1951

Call #: B3958 .S758 v.1

contains marginal lining and underlining

PDF Information: 94 pages – 39 MB

Conceptual Design Of An Integrated Small Satellite Environmental Testing Platform: Addressing Subsystem Integration Challenges, Benjamin Ochs, Michael Harrigan, Victoria Coverstone

Small Satellite Conference

Environmental testing for small satellites often relies on separate systems to simulate space conditions, resulting in inefficiencies, increased operating costs, and challenges in accurately modeling the complex environment. This paper presents the conceptual design of an integrated testing platform that combines thermal, vacuum, solar, magnetic, navigation, and attitude control simulations into a single piece of hardware to provide reliable mission assurance. The design emphasizes the modifications required to overcome unique interactions between subsystems, enabling simultaneous, realistic environmental qualification of small satellites while reducing cost and complexity.

The fully integrated environmental testing system incorporates a thermal vacuum chamber (TVAC) with an …

Finch Eye: The Optical And Optomechanical Design Of A Grism-Based Swir Hyperspectral Imaging Payload For A 3u Cubesat, Iliya Shofman, Mario Ghio Neto, Theaswanth Ganesh, Kenya He, Aidan Armstrong, Ksenya Narkevich

Small Satellite Conference

Crop residue is an important metric used for agricultural land-use monitoring and climate science research. Estimating crop residue coverage is essential to sustainable agricultural practices. There already exist scientific hyperspectral satellites, such as PRISMA and EnMAP, that can be used for crop residue estimation; however, they are very expensive to build and cannot be monopolized by individual farms. This leaves a gap in satellite remote sensing solutions which can be deployed operationally and at the farm scale. We seek to fill this gap by developing a low-cost satellite solution for crop residue estimation. The University of Toronto Aerospace Team is …

Extremely Low-Cost Optical Receiver For Extremely Low Resource Optical Identifiers, Ashin Alex, Joseph Ashby, Kevin Walker, Brennan Chai, Catherine Qualtrough, John E. Cater, Nicholas J. Rattenbury

Small Satellite Conference

Space object identification (SOI) is essential for space traffic management, situational awareness, and mission operations. The Extremely Low Resource Optical Identifier (ELROI), developed by Los Alamos National Laboratory, provides a persistent and interference-free identification method for small satellites through a self-powered optical beacon. ELROI transmits a unique identification code via low-power laser pulses, enabling ground stations to identify spaceborne assets without relying on traditional radio beacons. However, the efficacy of the ELROI system relies on the widespread availability of highly sensitive and cost-effective ground-based optical receivers. To address this need, we are developing a low-cost optical receiver capable of detecting …

In-Orbit Reprogramming Of Satellite’S Fpgas, John Cone

Small Satellite Conference

This document discusses the development of a system to reprogram an FPGA that is located on a satellite in orbit. The new image for the FPGA will be telemetered to the satellite and passed as command data to the subsystem containing the FPGA. The method for reprogramming is robust, verifies that the FPGA image was not corrupted during transmission, and does not rely on the current image or functionality of the FPGA.

Small satellites use Field Programmable Gate Arrays (FPGAs) to interface with the satellite computer and other instruments such as cameras and sensors. These FPGAs are traditionally programmed on …

Performance Quantification Of Diverse Controller Structures In A Non-Cooperative Multi-Agent Orbital Environment, Patrick Williams, Ryan Karow, Jacob Witthuhn, Cannon Kilcrease, Kyle King, Joshua Varon, Imraan Faruque

Small Satellite Conference

Poster presented during the 2025 SmallSat Conference.

Satellite Navigation With Earth Islands For Scope-1, S. Anand Agrawal, Brandon A. Jones

Small Satellite Conference

Spacecraft optical navigation can deliver autonomous navigation onboard when Earth-based tracking is saturated, obstructed, or impractical. Optical navigation relies on the correspondences between detected and known or mapped features in imagery to extract position and/or velocity, and data-driven methods, which directly leverage collected data to learn, can improve detection performance. This paper presents an initial data-driven Earth-based detection system using islands as landmarks for the SpaceCraft for Optical- based Position Estimation-1 (SCOPE-1) 3U CubeSat, which will be paired on board with a physics-based estimation framework. The system consists of an island detector trained on Earth observation imagery of islands, an …

Simulation-Based Evaluation Of Dual-Mode Propulsion Strategies For Small Satellite Collision Avoidance, Michael Harrigan, Charles Cundiff, Joshua L. Rovey, Victoria Coverstone

Small Satellite Conference

As Low Earth Orbit (LEO) becomes increasingly congested, small satellite missions face growing challenges in executing effective collision avoidance maneuvers under limited time and propellant constraints. Dual-mode propulsion systems, combining high-thrust chemical and high-specific impulse electric modes, offer a promising approach to balance rapid response with propellant conservation. This paper evaluates how such systems can be applied to reduce the Probability of Collision (PC) within constrained maneuver windows using sequential chemical-electric burns.

A FreeFlyer-based simulation framework models dual-mode collision avoidance maneuvers across synthetic LEO scenarios. For each case, user-defined mission parameters, such as lead time, PC threshold, and orbital altitude, …

Skyforge Core: A Triple Modular Redundant Computing Architecture For Small Satellites, Harrison Schmitt, Thomas Mcwatters, Ethan Hoyt, Josh Ellman, Sameer Sikander, Nate Westrum, Jordan Clark, Taebaeksanmaek Jung, Micah Williams, Lauren Myers, Kelden Wright, Matthew Homburg, Alex Roth, Jinran Zhang, Peter Staritz

Small Satellite Conference

As small satellite missions grow in complexity, there is increasing demand for greater onboard computational performance. Traditional radiation-hardened processors, while reliable, are expensive, slow, and suffer from long procurement timelines. In contrast, commercial off-the-shelf processors like the Raspberry Pi offer high performance at low cost but are vulnerable to radiation-induced faults such as single-event upsets. SkyForge Core is an experimental computing system that addresses this challenge by integrating three Raspberry Pi Zero W units into a triple modular redundant architecture. The system executes identical tasks on each Pi, compares outputs using majority voting, and identifies discrepancies. If a failure occurs, …

The Occultation Wave Limb Sounder, N. Jones, R. Sewell, E. Thiemann, K. Greer

Small Satellite Conference

The Occultation Wave Limb Sounder (OWLS) is a mission designed to investigate how Earth’s thermosphere responds to atmospheric gravity waves. The dissipation of gravity waves in the thermosphere has the potential to both heat and cool the atmosphere, with published simulation results reaching conflicting conclusions on whether gravity wave heating or cooling dominates. Comprised of two instruments, the Extreme Ultraviolet Occultation Photometers (EUV-OP) and Compact Spectrograph for Occultations on the Limb (CSOL), OWLS will seek to resolve this controversy. Properties of the atmosphere will be retrieved by both instruments through solar occultations. EUV-OP will retrieve thermospheric temperatures using this technique, …

Rosisat - The Radiation Orbital Shielding Investigation Satellite, Steven Insignares, Jacob Blanton, Colson Walker

Small Satellite Conference

• The Radiation Orbital Shielding Investigation Satellite (ROSISat) is an ongoing 1U CubeSat project designed to study the effectiveness of various materials as shielding against single-event upsets and effects on computer memory modules in Earth orbit.
• ROSISat is a student project managed under the Embry-Riddle Orbital Research Association (ERORA), a registered student organization at Embry-Riddle Aeronautical University in Daytona Beach, Florida.
• It is one of three projects from ERORA presented at this conference, alongside tBEARR and SATLASS.
• ROSISat aims to be the first of ERORA’s projects to be launched and operational in LEO, serving to develop CubeSat flight heritage at ERAU.

The University Of South Carolina's Journey To The Launchpad, Patrick Bailey, Wout De Backer

Small Satellite Conference

A student team at the University of South Carolina is currently working to address the state’s needs for astronautics to both students and to the economy through collaborative efforts with other state institutions. This paper intends to cover the mission concept formulation, areas of beneficial technology development in space, and mission objectives that are to be accomplished for both human and technical capabilities within the state throughout the mission duration. The mission concept covers using 3D printing in space for on-orbit manufacturing capabilities, and the need for development of a computer vision algorithm and system for small space debris detection. …

Physical Implementation Of Sprint (Space-Based Prioritized Real-Time Inter-Satellite Network Technology), Maleeha Altaf, Dalia Ammar Khodja, Ryan Adams, Sreejith Vidhyadharan Nair, Ronald Fevig

Small Satellite Conference

Poster presented during the 2025 SmallSat Conference.

Cadence-Swans: Continuous Autonomous Detection Enabling Networked Collaboration Explorers Of A Space Weather Anomaly Notification System, Matthew Chang, Kelly Williams, Pragun Bethapudi, Chloe Lau, Giselle Revolorio, Ella Shepherd

Small Satellite Conference

Through the University Nanosatellite Program (UNP), the Bronco Space Lab at Cal Poly Pomona presents Continuous Autonomous Detection Enabling Networked Collaboration Explorers of a Space Weather Anomaly Notification System (CADENCE–SWANS): a pathfinder mission demonstrating autonomous space weather monitoring using a low-latency, onboard radiation notification system. The spacecraft conducts coarse energy spectroscopy in real time to detect elevated radiation levels and autonomously generate notifications, including time-stamped records of detection-to-decision latency.

CADENCE–SWANS uses a novel compact, low-SWaP-C coarse particle energy spectrograph, constructed with varied thicknesses of shielding, to estimate particle energies without requiring precise pointing or expensive particle detectors. This approach enables …

Development Of A Scalable Electrical And Mechanical Backplane For The Guaranisat-2 Cubesat Mission, Edgar Elias Ramirez Sosa

Small Satellite Conference

This paper presents the design, development, and validation of a custom backplane interface board for GuaraniSat-2, Paraguay's second nanosatellite. GuaraniSat-2 is a 3U CubeSat developed through a collaborative effort led by the Paraguayan Space Agency (AEP) and SpaceLab, with the active participation of stakeholders such as the Polytechnic and Engineering Faculties of the National University of Asunción (UNA), Catholic University of Asunción (UCA), the LIESE lab at the National Autonomous University of Mexico (UNAM), NASA's Jet Propulsion Laboratory (JPL), and Astradyne, an Italian startup spun off from the Polytechnic University of Bari (Politecnico di Bari). The backplane board functions as …

A High-Sensitivity, Low-Power Magneto-Inductive Magnetometer For Space-Based Magnetic Field Measurements And Noise Mitigation, Rowan Antonuccio, Kade Howes, Josh Taylor, Charles Swenson

Small Satellite Conference

This paper presents a discrete-component, magneto-inductive (MI) magnetometer designed for CubeSat-class spacecraft. The sensor operates using an RL relaxation oscillator with FPGA-based pulse counting, achieving picotesla-scale resolution at 1 Hz with 25 mW power consumption. To minimize electromagnetic interference and maintain orthogonality, the sensing coils are housed in a rigid, boom-mounted enclosure constructed from non-magnetic materials. This architecture enhances measurement fidelity and supports in-orbit reconfiguration, offering a low-power research platform suitable for high-resolution magnetic field sensing.

Detumbling Analysis And Attitude Stabilization Of Spicesat: A Closed-Loop Control Verification Framework, Spencer Talish, Francesca Fusco

Small Satellite Conference

This study investigates the detumbling capabilities of SPICEsat following an initial angular disturbance imparted by the deployer. SPICEsat, which stands for Sloshing Platform for In Orbit Controller Experimentation, is a 6U CubeSat developed by Rutgers University to investigate the effects of fuel sloshing on spacecraft stability and control. Top level, this research’s objective is to confirm SPICEsat's ability to reduce angular momentum, thereby achieving a stabilized post-deployment attitude. This is referred to as detumbling, or the process of reducing a satellite’s rotational rates following deployment. The system-level focus centers on assessing the control authority of the Blue Canyon Technologies (BCT) …

Developing A Model-Based Systems Engineering Methodology For Academic Cubesat Missions, Piper L. Kline

Small Satellite Conference

Cube Satellites (CubeSats) have become increasingly popular, particularly in academic settings, due to their affordability, rapid development timelines, and utility as platforms for student training and experimental payloads. Despite these advantages, CubeSat development presents several challenges, including limited resources such as personnel, funding, and time, as well as difficulties in maintaining comprehensive documentation and managing requirements. Student-led projects face additional obstacles, such as inexperienced team members and high turnover rates, which can result in inadequate passing of knowledge. Model-Based Systems Engineering (MBSE) has emerged as a promising approach to address these challenges and improve the efficiency of CubeSat design and …

Development Of A Compact Optical Communications Terminal For The Pulse-A Cubesat, Sofia Mansilla, Seth Knights, Natalie Orrantia, Maya Mcdaniel, Daniel Lee, Oliver Shoemaker, Aidan Etterer, Aishani Mohan, Chris Wong, Juan Ignacio Prieto Asbun, Robert Pitu, Logan Hanssler, Annie Shuford, Eliana Schiller, Kira Chin, Graydon Schulze-Kalt, Danielle Zumi Riekse, Mira Singh, Alexandra Yao, Vicky Bardon Soto, Natalie Sauer, Vidya Suri, Tian Zhong

Small Satellite Conference

The Polarization-modUlated Laser Satellite Experiment (PULSE-A) at the University of Chicago aims to demonstrate the feasibility of circular polarization shift keyed (CPolSK) satellite-to-ground laser communication links. The project aims to advance high-speed optical satellite-to-ground communications as an alternative to the traditionally used radio frequencies. PULSE-A thus requires the development of a compact, low-loss optical communications terminal capable of emitting collimated and high-power circularly polarized light modulated at high frequencies. Here we present a design for an optical communications terminal capable of achieving output powers of up to 230 mW at modulation frequencies from 1 to 10 MHz with a maximum …

Development Of A Polarization-Based Optical Communications Ground Station For The Pulse-A Cubesat, Juan Ignacio Prieto Asbun, Leah Vashevko, Mason Mccormack, Rodrigo Spinola E Castro, Ashley Ashiku, Joshua Johnson, Elizabeth Rosario, Kevin Zamudio, Sasha Malysheva, Nusret Efe Ucer, Qihong Wu, Sofia Mansilla, Seth Knights, Logan Hanssler, Mohammad Hassan, Sofia Cavallione, Nguyen Do, Tian Zhong

Small Satellite Conference

The Polarization-modUlated Laser Satellite Experiment (PULSE-A) is the University of Chicago’s student-led mission to demonstrate an optical downlink at a data rate of 1 to 10 Mbps using circular polarization shift keying (CPolSK). PULSE-A comprises a 3U CubeSat bus carrying a < 1.5U optical transmission terminal and a dual optical-RF ground station. The ground station (GS) system consists of the optical ground station (OGS) and the RF ground station (RFGS). The RFGS is responsible for standard communications and control tasks, while the experimental OGS receives the optical transmission from the satellite’s payload.

To perform satellite-to-ground optical communications, the OGS needs to track, receive, and decode the transmitted signal while providing its own beacon, which allows the satellite to track the OGS. These requirements are accomplished by four assemblies within the OGS: tracking, polarization state preparation, signal decoding, and beacon. The tracking assembly collects, condenses, and collimates incoming laser light from the …

Development Of An Open-Source Spacecraft Bus For The Pulse-A Cubesat, Graydon Schulze-Kalt, Robert Pitu, Spencer Shelton, Catherine Todd, Zane Ebel, Ian Goldberg, Leon Gold, Henry Czarnecki, Mason Mccormack, Larry Li, Zumi Riekse, Brian Yu, Akash Piya, Vidya Suri, Dylan Hu, Colleen Kim, John Baird, Seth Knights, Logan Hanssler, Tian Zhong, Michael F. Lembeck

Small Satellite Conference

The undergraduate-led Polarization-modUlated Laser Satellite Experiment (PULSE-A) at the University of Chicago seeks to demonstrate the feasibility of circular polarization shift keyed satellite-to-ground laser communication. Free-space optical communications offer significantly improved data rates and lower power requirements than radio frequency communications for a similar form factor, which makes optical communications of particular interest for future satellite missions as on-orbit data collection rates increase. PULSE-A’s low-cost open-source bus serves as the backbone of the mission and has been designed in tandem with the Payload, with design driven by strict requirements for pointing accuracy, component alignment, power demand, and thermal stability. This …

Development Of Itasat-2 Cubesat's Primary Structure With Ait-Oriented Design Now, Denis Guilgim Vieira, Lídia Shibuya Sato, Renan Guilherme Soares Meneses, Felipe Oliveira Tavares, Uziel Parada Nunes, Pedro Henrique Dos Santos Alves, Douglas Luan Cardoso Arena, Isabela Dos Santos Pereira, Luis Eduardo V. Loures Da Costa

Small Satellite Conference

The ITASAT2 mission is a key advancement in CubeSat technology, building upon the progressive development of small satellite missions at the Instituto Tecnológico de Aeronáutica (ITA). As a continuation of the ITASAT and SPORT missions, ITASAT2 consists of three 16U CubeSats in a formation flight, designed to investigate critical space weather phenomena and perform technological demonstration of geolocation and formation flight. In addition to its scientific contributions and technological demonstration, the mission incorporates technological advancements to improve CubeSat design and integration processes. The ITASAT2 project is part of the progressive evolution of CubeSat missions at ITA, simultaneously addressing space weather …

Development Of Mechanical Ground Support Equipment For Small Satellite Thermal Vacuum Testing, Vincent Côté-Larouche

Small Satellite Conference

Small satellite thermal vacuum tests involve securely mounting a spacecraft in a chamber, providing a representative thermal environment in the absence of convection. This study investigates the design of mechanical ground support equipment for supporting a range of spacecraft masses, from cubesats to ESPA-Grande class satellites of up to 500 kg, inside an existing thermal vacuum chamber. A system of four pieces of equipment is proposed to facilitate thermal vacuum testing, while keeping in mind various considerations such as the laboratory cleanroom environment, available floor space, the load capacity of the chamber rails, the thermal vacuum environment and the human …