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Pulse-profile Modeling and Spin–Orbit Alignment in a Suzaku Sample of Accreting X-Ray Binary Pulsars
Get PDFWe report pulse-profile modeling of a sample of 23 X-ray binary pulsars observed with the Suzaku X-ray satellite. These pulsars have spin periods ranging from 0.7 to 9400 s, and their X-ray emission is powered by the accretion from their stellar companions. We fitted each individual pulse profile with the Polestar geometric model, which accounts for X-ray emission from two hot spots modeled as a simple combination of fan+pencil beam components, including an approximation for gravitational light bending. In 14 of 21 cases, our measurements of the inclinations of the pulsar spin axes broadly agree with the corresponding inclinations of the orbital planes of the binary systems determined by various other means, a striking outcome with a mere 6 × 10−7 probability of occurring by chance. The implications of our study are as follows: (a) apparently, accretion torques have had time to erase spin–orbit misalignment caused by supernova kicks in two-thirds of the systems; (b) many X-ray binary pulsars have dominant dipolar surface magnetic fields, in contrast to the recently reported exotic configurations in millisecond pulsars; and (c) if the binary inclinations can be determined by pulse-profile modeling, even for a subset of the ∼200 known X-ray binary pulsars, most of which orbital inclinations are as yet poorly constrained, it raises the prospect of tightening dramatically ongoing neutron-star mass determinations. This is because masses in binary systems overwhelmingly come from an orbital-mechanics formulation (Kepler’s third law), in which the dominant source of uncertainty is the inclination of the orbital plane
Admissions Magazine Fall 2025
Get PDFAltitude: Llamas in Space Empowered by Technology Education at a Higher Altitude Code it. Create it. Play it. Good Vibrations From Classroom to Control tower Next Level Flight Training Llamas don\u27t fly but our cameras do. Leading by example The Future of flight Passion meets Purpose From Campus to Cosmos Game Changing Drones Chasing Shadows Engineering the Future of Memory Technology This Eagle\u27s got Wings and Game Global Citizenship and Aviation business Pathways to Success From Mrs. Utah America to aviation safety expert Daniel Bush\u27s dual pursuit of service and scholarship.https://commons.erau.edu/admissions-magazine/1010/thumbnail.jp
Disentangling Atmosphere and Sky: Ontology, Space Debris, and Moral Mattering
No full textSpace exploration activities generate novel problems for philosophical consideration. As space activities increasingly populate Earth’s orbital environment with both operating space infrastructure and junk, humanity is faced with new threats. One significant worry is Kessler syndrome, a potential cascade of space debris that could trap humans on Earth while destroying satellite infrastructure. Approaching the growing problem of space debris from the perspective of environmental philosophy reveals a host of additional concerns within environmental ethics, aesthetics, and politics. Adequately considering the effects of increasing space debris, as well as the particular environmental ramifications of such accumulation, requires (re)consideration of ordinarily backgrounded environmental objects – the sky and the atmosphere – for the application and extension of environmental ethics to humanity’s activities in outer space
Miami Beach Collins Avenue Postcard from early 1940s
No full textOne of a series of postcards bought by A W (Tony) Linfield, 5BFTS cadet on Course 18 (December 1943 - June 1944) while he was in Florida. Tony was a founder member of the 5BFTS Association and became the first Honorary Secretary. He donated his postcard collection to the 5BFTS Archives.https://commons.erau.edu/bfts-images-florida-ww2/1014/thumbnail.jp
Greetings from Florida Postcard from early 1940s
No full textOne of a series of postcards bought by A W (Tony) Linfield, 5BFTS cadet on Course 18 (December 1943 - June 1944) while he was in Florida. Tony was a founder member of the 5BFTS Association and became the first Honorary Secretary. He donated his postcard collection to the 5BFTS Archives.https://commons.erau.edu/bfts-images-florida-ww2/1007/thumbnail.jp
Wing Structure Design the RAMP-200
Get PDFThis project focuses on the design of the wing structure to increase fatigue resistance and lessen the shear force across the skin of the wings, while maintaining the structure’s stability and soundness. The designed wing structure will be optimized to account for the proposed weight and endurance of the aircraft. The overall wing shape and size was defined using preliminary design methods and optimized for efficiency at Mach 0.9. The main structures were sized using calculations that were programmed into MATLAB and supported by hand calculations. Finite element analysis was used to verify sizing, and the structures were assessed using fatigue life and crack propagation prediction. The designed wing structure will support a higher cruise speed and altitude while maintaining safety requirements. The wing structure will reflect a wing that fits in the modern era facilitating a higher fuel efficiency than competitor airframes. This project demonstrates a design balance between strength, weight, cost, durability, and fatigue resistance to reduce the inspection and maintenance intervals of the wing thereby saving on operating costs
Recovering from Industrial Overshoot: Direct Air Capture of CO2
No full textHumanity has elevated atmospheric CO2 from a pre-industrial value of 270 ppmv (parts per million by volume) to 425 ppmv, with a current rate of increase of 3.75 ppmv per year. Because somewhat over 80% of humanity\u27s energy consumption is derived from fossil fuels and because it takes decades to meaningfully change energy sources, we expect atmospheric CO2 to rise well past 450 ppmv and drive substantial climate and ecological disruption. This industrial overshoot requires that humanity develop methods to remove CO2 from the atmosphere.
We report on direct air capture of CO2 using a combination of adsorption and cryogenic cooling, all at industrial scale and operated in environments of low ambient temperature. While technological developments are required for this system’s efficient operation, those developments leverage a long history of industrial technology and experience, and they can be developed and tested at modest scale. The energy required to remove CO2 from the atmosphere via this approach may be competitive with direct air capture via previously-established techniques
Bridging Ecology and Technology: The Role of UAS in Enhancing Spatial and Temporal Environmental Data Collection
No full textThe integration of uncrewed aircraft systems (UAS) into ecosystem research has expanded significantly in both scope and precision, driven by advances in platform technology, data processing capabilities, and the development of adaptive sensor payloads. Embry-Riddle Aeronautical University (ERAU), a recognized leader in aviation innovation, leverages established partnerships with environmental scientists, municipal agencies, and organizations such as the Brevard Zoo and Stetson University Institute for Water and Environmental Resilience to advance environmental monitoring through aerial sensing technologies.
The research team has extensive experience conducting complex UAS operations and developing innovative methodologies for environmental observation and remote sensing. Utilizing state-of-the-art RGB, multispectral, thermal, and LiDAR imaging technologies, the team’s efforts are designed to augment traditional monitoring methods by addressing spatial and temporal data gaps. These aerial data products provide critical insights that support water quality management, ecosystem health assessments, and climate change research.
This interdisciplinary collaboration unites environmental scientists, engineers, and UAS operations specialists to develop scalable and replicable monitoring frameworks. The team’s adaptive approach enables coverage of remote and inaccessible locations using long-range UAS platforms. In particular, the group’s vertical takeoff and landing (VTOL) systems, capable of Beyond Visual Line of Sight (BVLOS) operations currently authorized in Florida, exemplify the next generation of environmentally focused aerial research and data acquisition
A Mathematical Model on the Temporal Dynamics of Aviation Competitive Pricing
Get PDFThis study investigates the competitive dynamics of airport pricing using U.S. airport data to validate the findings. It employs linear and nonlinear ordinary differential equation models to analyze the influence of competitive interactions and internal factors on pricing decisions. The methodology involves parameter estimation via optimization techniques and quantile regression to capture heterogeneity across market segments. Mathematical analysis and simulation results show that if competitive coupling coefficients are low then there is weak competitive influence on pricing, with airports’ pricing largely driven by internal factors. Also, if the adjustment rates exhibit consistency across airports then internal dynamics are dominant in price adjustments. Using the US airports data, quantile regression further reveals that competitive effects become more pronounced in premium market segments, with variations across quantiles. The findings suggest that airport pricing strategies should focus on internal factors rather than competition. This study recommends integrating demand elasticity, capacity constraints, and stochastic elements to refine pricing models and enhance market efficiency
“Echoes of Raikō” Poetry Collection
Get PDFEchoes of Raikō is a poetic journey into themes of honor, loss, resilience, and the quiet strength that rises in the aftermath of tragedy. Through the voice of Takamura Raikō, a warrior shaped by grief and burdened by his reputation, I explore my own emotions, struggles, and reflections. These verses are grounded in personal feelings of anger, sorrow, hope, and redemption, weaving them into a narrative that feels both imagined and profoundly real. With vivid imagery and layered emotion, this collection invites readers to walk alongside Raikō as he confronts his past, questions his identity, and seeks the meaning of mercy in a world marked by violence