bluuebunny/crossref_metadata_2025_split huggingface dataset:
A robust and flexible AOCS architecture for OHB’s Standard Earth Observation Platform (EOS)
Authors:   OHB AG, Bremen, Germany, Rodriguez Julio 
Published: January 2024

OHB System AG has developed a new flexible Standard Earth Observation Platform called ‘EOS’ with the objective to serve the new Sentinel missions of the Copernicus program. The Copernicus program is an Earth monitoring initiative led by the European Union (EU) and carried out in partnership with the EU Member States and the European Space Agency (ESA) to access accurate and timely information services to better manage the environment, understand and mitigate the effects of climate change and ensure civil security.
OHB’s EOS platform is targeting both the Sentinel expansion satellites, which have been contracted 3 years ago as well as the Sentinel extension satellites which are in the study phase and also potentially Earth Explorer satellites and national missions not requiring very high agility. All of those have different orbits and payloads and therefore pointing requirements. The goal of EOS is to provide a generic platform design with suitable performances at low recurring prices to potential customers. As the satellite platform in most cases is composed of common and well-established technologies, it provides the opportunity of fast track and low risk platform adaptation to different mission needs.
The challenge of the AOCS architecture for EOS was to determine the kind of sensors, actuators and algorithms necessary to build a reliable and at the same time flexible architecture capable to cope with all kind of missions by varying the performance, technology or number of the sensors/actuators within the platform overall design. This means to satisfy all constraints (mechanical, thermal, electrical and programmatic) from other subsystems while reaching the necessary accuracy to complete the mission tasks demanded by the payload.
The AOCS architecture of the EOS platform is currently serving the Anthropogenic CO2 Monitoring Mission (CO2M) of the Copernicus program showing its flexibility and capacity to be adapted for a specific purpose while providing the required performances to complete a desired mission.
Aerocapture Guidance Design for the AERODEM Mission
Authors:   Ariane Group, Les Mureaux, France, Vernis Philippe , Ball Andrew 
Published: January 2024

Since its first developments in the 80’s the aerocapture has always been a promising insertion technique
to place a spacecraft on a parking orbit after an interplanetary cruise. However it has never been in-flight
demonstrated, defining an aerocapture mission around Earth yielding numerous safety issues in addition
of requiring highly energetic conditions at entry interface. It is clearly less the case for an exploration
mission. In order to deplete the energy of the spacecraft along its atmospheric path new aerocapture
principles emerged in the recent years by replacing the classic lift modulation by a single or multiple-event
drag modulation. As for any aerocapture mission, propulsive corrections will have to be performed after
atmosphere’s exit in order to raise the periapsis and then to adjust the apoapsis to the targeted value
and, if really needed, to correct the inclination. But the main advantage of such new technique is to ease
the design of the spacecraft that does no more require a dedicated RCS to control the attitude of the
vehicle during its atmospheric path but only a mechanical deployment /jettisoning of a rigid or inflatable
heat shield, the spacecraft being thus passively stabilized at a low spinning rate.
AERODEM is an aerocapture demonstration mission at Mars studied for ESA that should rely on such
insertion technique. Within the frame of past ESA or EU-funded studies, different aerocapture guidance
schemes have been designed at ArianeGroup in order to reach an elliptic intermediate orbit using the lift
modulation technique. Among those ones and after some adaptation to manage only the drag a simple
and robust numerical predictor-corrector guidance scheme has been selected to perform such mission.
This paper aims at presenting the retained guidance design whose preliminary performance is illustrated
by Monte-Carlo simulations for two generic missions termed as standalone, for a 470 kg spacecraft, or
piggy-back, for a 155 kg spacecraft.
A Passive Device for Postmortem Detumbling/Antitumbling of LEO Satellites, to Facilitate Active Removal
Authors:   Airbus Defence And Space, Toulouse, France, Senes Maxime , Lagadec Kristen , Brault Baptiste , Raffier Bertrand 
Published: January 2024

To limit the risk of cascading collisions, we will need active debris removal missions to retrieve satellites that die before they can be deorbited. It is well understood that sudden fatal failures can cause a dead satellite to tumble uncontrollably, but it also happens that even properly decommissioned satellites are not immune to spontaneous self-tumbling due to momentum buildup from solar radiation pressure torque, making removal much more challenging. The availability of a detumbling/antitumbling device ensuring passive stabilization of dead satellites could greatly reduce the risk and cost of debris removal missions.
We present a totally passive magnetic damping device attached to a satellite's structure, where a rotor fitted with magnets is free to rotate inside a metallic housing. Even if the satellite is tumbling, the rotor stays aligned with the geomagnetic field: the differential angular rate between the rotor and the satellite will create eddy currents in the housing and thus dissipate rotational energy, eventually stopping the tumbling motion.
Detailed sizing and simulation activities have demonstrated that one such small (h < Phi < 5cm diameter) and lightweight (m < 100 grams) device was capable of detumbling a medium-to-large satellite (5000 kg.m² of inertia) with a detumbling time constant of a few weeks.
We present the current development status, including the results of vibration tests with two representative prototypes built around two competing technologies for the rotor bearing.
These steps pave the way for the final development stages of a universally available detumbling function that can be a game-changer for reducing the future burden of taking care of defunct LEO satellites.
Design of Identification and Compensation Methods for Space Rider GNC Algorithms
Authors:   Politecnico Di Torino, Torino, Italy, Garino Cristiano , Marco Giannini Ing. , Capello Elisa 
Published: January 2024

The ESA Space Rider System is designed to provide Europe with the first reusable and independent end-to-end orbital platform, to deliver an uncrewed orbital laboratory able to de-orbit, re-enter, land and be relaunched after limited refurbishment. In this context, AVIO is the prime contractor of the support module that must guarantee the guidance, navigation and control functions during the orbital phase of the system.
High versatility and reliability are thus requested for the AVUM Orbital Module since the Space Rider mission foresees various in-orbit experiments, ranging from payload for commercial and institutional applications to In Orbit Verification/Demonstration missions, microgravity experiments, and Earth/Space observation. From this perspective, it becomes of paramount importance to manage all the operative conditions for which the GNC must guarantee the best performance in terms of accuracy and operative duration.
Attitude sensors must guarantee high data reliability despite being subjected to stresses during launch, a harsh operating environment and not least any assembly errors during integration. Constant in-orbit calibration is, therefore, necessary to meet requirements. Actuators, on the other hand, must be able to compensate for system and external uncertainties and manage any non-nominal condition. In particular, the malfunctioning or degraded behaviours of actuators are to be taken into account.
The objective of this thesis is to investigate the counteract action that the Space Rider’s GNC must implement to identify and compensate for all the effects that could degrade the mission performance. Specifically, both sensor and actuator issues are addressed. To achieve this, sliding mode techniques are used for both identification and compensation phases, combined with closed-loop analysis of sensors and actuators. The performance and robustness of these algorithms are then demonstrated using simulations of real operating conditions that Space Rider will face in future missions.
Development of Redundant Integrated Navigation System (RINS) for launch vehicle
Authors:   Jaxa, Tsukuba, Japan, Ichikawa Tomonori , Matsumoto Shuichi , Sakai Tomohiko , Komiyama Mizuki , Kakinuma Masahiko , Eda Tomoaki , Kasahara Masaru , Ushijima Masataka 
Published: January 2024

For the cost reduction of avionics equipment for launch vehicles, we did cost analyses of avionics equipment for H-IIA rocket and found that more than a half of the total cost of avionics equipment is occupied by the cost of specially qualified space electronic parts. This is due to the special requirements for rocket avionics equipment, high vibration, wide temperature range, and severe space radiation environment. Since we can make use of recent automotive electronic parts which are less expensive and have environmental resistance for high vibration and wide temperature range, only space radiation environment is a major issue.
Thus JAXA has been studying the radiation mitigation techniques using special electronic circuit technology for non-space electronic parts which are less expensive and do not have radiation tolerant capability. The radiation mitigation techniques include redundant electronic circuits, redundant modules, current monitoring and so on.
Using these radiation mitigation techniques, we developed a low cost and accurate navigation system for launch vehicles named “Redundant Integrated Navigation System” (RINS). RINS uses automotive CPUs, commercial GNSS modules with special firmware for space applications, and commercial MEMS IMUs and applies above-mentioned radiation mitigation techniques for them.
To evaluate RINS’s functions and performances on severe launch vehicle environments, we developed RINS engineering model (EM) and did qualification tests of RINS for launch vehicle and RINS passed all items of the qualification tests. We also did the flight test of RINS EM during launch phase by Epsilon rocket F6 launched on October 12, 2022. The RINS installed on the second stage of Epsilon rocket F6 worked normally and performed IMU-GNSS integrated navigation within the required accuracy during the launch. Another RINS flight test is the fight test on H3 rocket first flight, H3TF#1, which will be launched in February 2023. After these flight tests, RINS will be used as flight trajectory monitoring system on Japanese flagship rockets, H3 rocket and Epsilon S rocket.
This paper shows the system design and manufacture of RINS which uses the radiation mitigation techniques using special electronic circuit technology for non-space electronic parts. This paper also presents the flight test results during launch phase by Epsilon rocket F6. The flight test results on H3TF#1 might be shown in the final paper.
Path to First Flight of Adaptive Augmenting Control on NASA’s Space Launch System for Artemis I
Authors:   NASA Engineering and Safety Center, Kennedy Space Center, United States, VanZwieten Tannen , Wall John , Orr Jeb 
Published: January 2024

This paper describes the development and implementation of the Adaptive Augmenting Control (AAC) system for NASA’s Space Launch System, leading to its groundbreaking flight demonstration during the Artemis I launch on November 16, 2022. Particular attention is given to principles that may be useful to flight controls practitioners of future space transportation systems, with an emphasis on the studies, perspectives, and principles that shaped the early concepts and algorithm design refinements. Principles that drove the design architecture included ensuring the adaptive system was structured such that it would improve the baseline flight control system robustness, yet not unacceptably increase risk when the vehicle was operated within its nominal design envelope. Other key principles included maintaining a classical design architecture and relying on the adaptive system only to augment the control commands, an ability to both increase performance (error regulation) and decrease performance to avoid exciting parasitic dynamics such as vehicle flexibility and slosh, and a prescribed bound on the adaptive gains that correlated to classical stability margins. As the design matured, the designers sought the simplest adaptive control law architecture that met the design objectives, multiple stability analysis approaches were investigated, and the architecture was rigorously reviewed and evaluated using both high-fidelity simulations and a surrogate aircraft flight test campaign.
The paper will document the evolution of the architecture, discuss analysis techniques employed, and provide an overview of the path that led to a successful transition of the technology from concept to flight. The original design that was tested and developed using a reduced order simulations is shown to evolve systematically to the final architecture that was flown on Space Launch System, the launch vehicle for the Artemis I mission. Analysis techniques employed throughout the AAC design, development, and verification phases will be discussed; these include standard Monte Carlo analyses (comparisons with and without AAC), expanded Monte Carlo analyses that included worst-on-worst dispersions, stressing cases, frequency-domain stability analysis accounting for the effects of AAC, time-domain stability margin assessments, and generalized gain margins based on the circle criterion. Key components of the AAC Technology Readiness Level (TRL) advancement will be described, including Software-in-the-Loop testing in the Marshall Space Flight Center’s System Integration Laboratory (SIL) and a suite of carefully designed flight tests on an F/A-18. In its final test during the uncrewed first flight of SLS, AAC performed as intended throughout the launch phase and its response reflected a flight trajectory within the pre-flight expectations.
Percepción de las juventudes sobre la calidad de atención en los Servicios de Salud Amigables
Authors: Granados Castro Delmy Virginia , García Sura Ana Guadalupe 
Published: January 2024

Introducción: El incremento de problemas por conductas de riesgo en la adolescencia, expuso la necesidad de servicios de salud efectivos, adecuados y de calidad. Metodología: Mediante un estudio mixto, se captaron las percepciones de las juventudes sobre la calidad y calidez de atención en los Servicios de Salud Amigables y los establecimientos que consultan, con un cuestionario dirigido a personas usuarias de 7 municipios, que evaluó la calidad de atención y la experiencia del usuario. También, con entrevistas grupales e individuales que estimaron el nivel de satisfacción. Resultados: Las juventudes visitan los establecimientos de salud, para la consulta médica, aunque, desconocen los programas exclusivos para ellos o los Servicios de Salud Amigables. Los servicios mayormente consultados fueron Medicina general y Odontología, en menor proporción los preventivos (alcohol, drogas y violencia). El respeto, confianza y privacidad que brindan los profesionales de salud fueron los aspectos mejor evaluados, la señalización de servicios, los peores. La mayoría reportó tiempo de espera de 30 a 60 minutos, aunque, una minoría refirió esperar más de 2 horas. Para evaluar los servicios prefieren una encuesta al finalizar la consulta y la opinión grupal. Conclusión: Actualmente, existe necesidad de mejorar el acceso a los servicios para adolescentes y jóvenes mediante la socialización de la oferta para fomentar su uso. Asimismo, de incrementar la atención en educación sexual, anticonceptivos, embarazo e implementar la evaluación de estos, con métodos diferentes a los actuales.
Tumor pseudopapilar sólido de páncreas, una neoplasia inusual
Authors: Fuentes Eduardo José , Pérez Beltrán Mirian Liliana , Contreras Karla Jeannette , Guevara Vásquez Beatriz María , Ábrego Pedro 
Published: January 2024

Presentación del caso. Se trata de una mujer de 26 años que presentó dolor en epigastrio e hipocondrio izquierdo, con aumento del perímetro abdominal y pérdida de 5 kg de peso corporal. En el examen físico se detectó una masa de gran tamaño en el epigastrio, con bordes regulares, ligeramente dolorosa al tacto y no móvil. Los estudios de imagen revelaron una neoplasia mixta en el cuerpo y cola pancreática. Intervención terapéutica. Se practicó una esplenopancreatectomía corpo-caudal, con extirpación completa del tumor. Evolución clínica. La paciente recibió cuidados especializados y vigilancia estrecha posquirúrgica en la unidad de cuidados intensivos, sin presentar complicaciones relevantes. Tras el alta hospitalaria, la paciente refirió un buen estado general en los controles de seguimiento, que incluyeron una tomografía realizada a los 12 meses, donde no se evidenciaron restos o recidivas tumorales.
La comunicación efectiva como un aporte de la lingüística aplicada a los servicios de salud
Authors: Magaña Salazar Mireya Yamilet 
Published: January 2024

La comunicación humana es un acto natural en el que suceden cosas. Existe una inquietud cuando se piensa cómo esta se desarrolla entre el personal que trabaja en las instituciones que brindan servicios de salud, pues no podemos prescindir de conversar a lo largo del día. Precisamente en ese contexto va dirigido este análisis, orientado a comprender algunas ideas sobre el uso del lenguaje en el ámbito profesional desde el enfoque de la lingüística, con el objetivo de tomar en cuenta sus aportes, cambiar paradigmas y adquirir habilidades para una comunicación efectiva en los servicios de salud.
The Internet Economy's Influence on the Financial Industry - Taking East Money as the Research Object
Authors: Zhang Yuchen 
Published: January 2024

The fast expansion of the Internet and technology over the last decade has given rise to a new financial market—the Internet economy. The Internet economy has added new power to the broader financial industry and has promising growth possibilities. Although internet economy is a hot topic nowadays, many people have limited knowledge towards what exactly is internet economy about and how it is different to the financial market before. Therefore, this essay will examine the influence of the Internet economy on the banking industry using East Money as the study object, by listing the existing advantages of the Internet economy: easier access to information, advances in data analysis under the backdrop of artificial intelligence, and the benefits brought by online transactions; as well as the disadvantages: increased transaction risks caused by Internet security risks and limitations of the current stage of artificial intelligence. Suggestions toward the downside of the internet economy that are mentioned in this essay will also be given at the end of this essay.
Approximate global illumination using photon mapping: A review
Authors: Ding Haochen 
Published: January 2024

This paper introduces the two-step process of the standard photon mapping algorithm and a variety of other global biased illumination algorithms using photon mapping that have been proposed in recent years. Since there are many global biased illumination algorithms based on photon mapping, this review is a combination of these algorithms for the convenience of the reader, and the two-step process of standard PM will also be presented in this review to accommodate readers who are not familiar with the field. We will first introduce the specific implementation process and principles based on the two steps of PM, photon tracking and rendering, and then introduce a variety of polarized illumination techniques using photon maps, compare these methods and discuss the advantages, disadvantages, and applicability of each method in detail, and finally give a specific implementation of each method to give readers a clearer understanding of these methods. The final implementation of each method is shown to give the reader a clearer understanding of these methods.
Therapeutic Vaccines for Ovarian Cancer
Authors: Wang Xinming 
Published: January 2024

Ovarian cancer is widely recognized as one of the most aggressive gynecological malignancies. Chemotherapy based on platinum and maintenance therapy following surgery are the cornerstones of treatment for ovarian cancer. However, early detection of ovarian cancer is difficult, frequently resulting in metastasis at the time of diagnosis, which impacts the efficacy of surgical interventions, leading to elevated rates of recurrence and a bleak prognosis. Immunotherapy has demonstrated the potential for improved treatment of ovarian cancer. Currently, cancer vaccines represent a significant immunotherapeutic approach. Cancer vaccines are a therapeutic approach designed to activate the patient's immune system to target and eliminate cancer cells. These vaccines can include tumor antigens, antibodies, cytokines, etc. to stimulate and initiate an immune response against the tumor. In this review, I provided an overview of past research progress in different therapeutic vaccines for ovarian cancer, including their mechanisms of action and advancements in preclinical and translational studies.
The Changing Trend of Primary Medical Care in China From The Perspective of Urban and Rural Areas
Authors: Luo Zixuan 
Published: January 2024

As one of the most populous countries in the world, China has consistently grappled with the challenge of uneven distribution and inequitable provision of medical resources between urban and rural areas. Urban regions boast a greater number of medical facilities and healthcare professionals compared to their rural counterparts, exacerbating the issue of insufficient medical resources and inadequate services in rural areas. This disparity not only impacts the health status of rural residents but also perpetuates social inequality between urban and rural communities. With China's ongoing process of urbanization, these disparities in healthcare have become increasingly pronounced. The objective of this study is to examine the evolving trends in China's primary healthcare system from an urban-rural perspective, aiming to gain a better understanding of how medical resources are distributed, access to healthcare services is facilitated, and disparities in medical consumption persist between urban and rural areas. The findings from this study yield several crucial recommendations: Firstly, it is imperative to prioritize enhancing the establishment of primary healthcare facilities in rural areas by significantly increasing both the quantity and quality standards for medical institutions while improving bed availability to meet the pressing needs for adequate healthcare among rural residents. Secondly, measures should be implemented to bridge the gap in distribution between health workers serving urban versus rural populations by incentivizing more professionals to engage in medical work within undeserved regions to ensure timely access for all individuals residing outside major cities. Additionally, both government entities and society at large should encourage increased investment by rural residents into their expenditure on healthcare while simultaneously improving overall levels of medical security coverage as a means of alleviating financial distress. Finally, it is imperative to adapt and optimize the rural industrial structure following the specific circumstances of different regions, thereby enhancing the income of rural residents and augmenting their capacity to allocate resources towards medical and healthcare expenditures.