Automated resupply of consumables: Enhancement of space commercialization opportunities

This paper addresses work performed at Rockwell International's Space Systems Division to investigate the feasibility of, and develop concepts for, automated and/or robotic resupply of consumables on orbit. The work focuses on the resupply of satellites and is described in five sections. First, the various problems relating the resupply on orbit are discussed: for example, economic concerns, fuel handling problems, and safety issues. Next major methods of effecting fuel transfer on orbit are summarized, together with their advantages and disadvantages. Direct fuel exchange is emphasized as the most feasible technique. Third, guidelines are developed for automated/robotic refueling mechanisms to accomplish on-orbit consumable resupply. For example, the guidelines cover safety, reliability, maintainability, alignment, induced loads, thermal protection, leaks, extravehicular activity (EVA) interface, and so on. The fourth part of the paper covers the development of design concepts for satellite resupply robotic interfaces that comply with the guidelines. Concepts include servicer fluid transfer system and satellite propulsion system, and a combined docking/umbilical device. Last, future technical development in these areas are discussed

Design guidelines for remotely maintainable equipment

The quantity and complexity of on-orbit assets will increase significantly over the next decade. Maintaining and servicing these costly assets represent a difficult challenge. Three general methods are proposed to maintain equipment while it is still in orbit: an extravehicular activity (EVA) crew can perform the task in an unpressurized maintenance area outside any space vehicle; an intravehicular activity (IVA) crew can perform the maintenance in a shirt sleeve environment, perhaps at a special maintenance work station in a space vehicle; or a telerobotic manipulator can perform the maintenance in an unpressurized maintenance area at a distance from the crew (who may be EVA, IVA, or on the ground). However, crew EVA may not always be possible; the crew may have other demands on their time that take precedence. In addition, the orbit of the tasks themselves may be impossible for crew entry. Also crew IVA may not always be possible as option for equipment maintenance. For example, the equipment may be too large to fit through the vehicle airlock. Therefore, in some circumstances, the third option, telerobotic manipulation, may be the only feasible option. Telerobotic manipulation has, therefore, an important role for on-orbit maintenance. It is not only used for the reasons outlined above, but also used in some cases as backup to the EVA crew in an orbit that they can reach

Quantum random walks without walking

Quantum random walks have received much interest due to their non-intuitive dynamics, which may hold the key to a new generation of quantum algorithms. What remains a major challenge is a physical realization that is experimentally viable and not limited to special connectivity criteria. We present a scheme for walking on arbitrarily complex graphs, which can be realized using a variety of quantum systems such as a BEC trapped inside an optical lattice. This scheme is particularly elegant since the walker is not required to physically step between the nodes; only flipping coins is sufficient.Comment: 12 manuscript pages, 3 figure

Estudio para la calculadora de edad vascular como herramienta para reducir el riesgo cardiovascular de la farmacia comunitaria

Tesis inédita de la Universidad Complutense de Madrid, Facultad de Farmacia, leída el 29-11-2021Background: Cardiovascular disease (CVD) is one of the leading causes of morbidity and mortality in Spain. According to the World Health Organization (WHO), 80% of these premature deaths are avoidable by reducing the modifiable risk factors of CVD. Research indicates that patients better understand their true risk when information is presented to them in vascular age (VA). Community pharmacists (CP) are well situated to assess patientsVA, provide professional educational advice, and implement interventions for reducing cardiovascular risk (CVR).Aim: The explicit objective of this thesis was to create a patient-centred, accurate and accessible tool that allows the CPs in Spain to estimate the VA and design a personalized intervention aimed at reducing the patient’s VA.Method: A website was created and included an original questionnaire, the vascular age calculator (VAC), detailed protocols for the pharmacist’s intervention and the patient’s information leaflets on CVR factors. The webpage user’s perceptions were analysed via a 26-item self-completion online survey distributed among CPs using a Google forum. Informed consent was taken from the CPs to participate in the study. The responses to the survey were collected anonymously. Open and closed questions were used to gain a wide range of replies and an in-depth understanding. The questionnaire from the pilot study was available online from the 1st August 2020 to the 31st of February 2021. The results were analysed using the STATA package version 12.0 (StataCorp LP, College Station, TX, USA). The NVivo software was used for assessing the descriptive findings...Antecedentes: La enfermedad cardiovascular (ECV) es una de las principales causas de morbilidad y mortalidad en España. Según la Organización Mundial de la Salud, el 80% de estas muertes prematuras se podrían evitar reduciendo los factores de riesgo cardiovascular modificables. Diversos estudios indican que los pacientes entienden mejor su riesgo real cuando se les presenta la información en forma de edad vascular. Los farmacéuticoscomunitarios (FC) están bien posicionados para evaluar la edad vascular de los pacientes, proporcionar asesoramiento educativo profesional y aplicar intervenciones para reducir el riesgo cardiovascular (RCV).Objetivo: El objetivo explícito de esta tesis fue crear una herramienta centrada en el paciente, precisa y accesible que permita a los FC de España estimar la edad vascular y diseñar un plan de intervención personalizado encaminado a reducirla. Método: Se creó una página web que incluía un cuestionario original, la calculadora de la edad vascular, protocolos detallados para la intervención del farmacéutico y folletos informativos para el paciente sobre factores de RCV. Se analizó la percepción de los usuarios sobre la página web a través de una encuesta online de veintiséis preguntas distribuida entre los FC mediante un formulario de Google. Se obtuvo el consentimiento informado de los FC para participar en el estudio. Las respuestas a la encuesta se recogieron de forma anónima. Se utilizaron preguntas abiertas y cerradas para obtener una amplia gama de respuestas y de mayor profundidad. El cuestionario del estudio piloto estuvo disponible en línea desde el 1de agosto de 2020 hasta el 31 de febrero de 2021. Los resultados se analizaron con el paquete STATA versión 12.0 (StataCorp LP, College Station, TX, USA). Para evaluar los resultados descriptivos se utilizó el programa informático NVivo...Fac. de FarmaciaTRUEunpu

Finite Bivariate and Multivariate Beta Mixture Models Learning and Applications

Finite mixture models have been revealed to provide flexibility for data clustering. They have demonstrated high competence and potential to capture hidden structure in data. Modern technological progresses, growing volumes and varieties of generated data, revolutionized computers and other related factors are contributing to produce large scale data. This fact enhances the significance of finding reliable and adaptable models which can analyze bigger, more complex data to identify latent patterns, deliver faster and more accurate results and make decisions with minimal human interaction. Adopting the finest and most accurate distribution that appropriately represents the mixture components is critical. The most widely adopted generative model has been the Gaussian mixture. In numerous real-world applications, however, when the nature and structure of data are non-Gaussian, this modelling fails. One of the other crucial issues when using mixtures is determination of the model complexity or number of mixture components. Minimum message length (MML) is one of the main techniques in frequentist frameworks to tackle this challenging issue. In this work, we have designed and implemented a finite mixture model, using the bivariate and multivariate Beta distributions for cluster analysis and demonstrated its flexibility in describing the intrinsic characteristics of the observed data. In addition, we have applied our estimation and model selection algorithms to synthetic and real datasets. Most importantly, we considered interesting applications such as in image segmentation, software modules defect prediction, spam detection and occupancy estimation in smart buildings

Unpacking interactions using Brousseau’s didactical milieu

In this work we used Brousseau’s Theory of Didactical Situation to examine ways in which interactions with a researcher/teacher influenced athematical practices of a child. The findings suggest an extension of teaching actions associated with TDS to include the process of stabilizing mathematical understanding of children as they interact with and engage in taskmilieu

A secure method to detect wormhole attack in mobile adhoc network

According to recent advances in wireless telecommunications, the performance and use of wireless technologies has increased extremely. In this study concerned on the Mobile Ad-hoc Network (MANET) is a collection of self-configuring mobile node without any infrastructure. There are different security flaws and attacks on the routing protocols in the MANET. One of the critical threats is the wormhole attacks, which have attracted a great deal of attention over the years. The wormhole attack can affect the performance of different routing protocols. During this attack, a malicious node captures packets from one location in the network, and “tunnels” them to another malicious node at a distant point, which replays them locally. This study presents a review of the most important solutions for counteracting wormhole attacks, as well as presents proposed method on DSR routing protocol for detecting them. The performance of the proposed method was examined through ns-2 simulations. Hence, the results show that proposed method can detect this serious attack in a Mobile Adhoc Network