Estudio sobre el secado en transporte neumático

Tesis inédita de la Universidad Complutense de Madrid, Facultad de Ciencias Químicas, leída en 1976.Fac. de Ciencias QuímicasTRUEProQuestpu

Estudio sobre el secado en transporte neumático

La précarité s’est imposée comme un risque social majeur dans la société française. Les étudiants, entre dépendance et volonté d’autonomie, sont particulièrement exposés aux dangers de la précarité. Comprendre la représentation de ce risque pourrait alors permettre d’agir en amont de la précarisation, pour protéger mais aussi prévenir son amorçage chez les étudiants. Une analyse prototypique et une analyse de contenu mettent en évidence que les étudiants identifient la précarité par ses multiples facteurs de risque mais aussi comme un risque de pauvreté et d’exclusion. Si le mal-logement, le chômage ou les difficultés financières ponctuelles apparaissent comme les dimensions principales de ce risque, la réactivation du lien social serait le meilleur moyen de prévention et protection pour diminuer le risque de précarité chez les étudiants.Precarity has become a major social risk in French society. Students, between dependence and will of autonomy are particularly exposed to the dangers of precarity. Understanding the representation of this risk could then allow to act upstream of the impoverishment process, to protect but also to prevent its apparition among students. A prototypical analysis and a content analysis highlight that students identify precarity through its multiple risk factors but also as a risk of longstanding poverty and exclusion. If unsane housing, unemployment or unexpected financial difficulties appear as the main dimensions of this risk, the reactivation of social connections might be the best means of prevention and protection against the risk of precarity among students

Estudio sobre el secado en transporte neumático

Tesis inédita de la Universidad Complutense de Madrid, Facultad de Ciencias Químicas, leída en 1976.Fac. de Ciencias QuímicasTRUEProQuestpu

The establishment of an engineering accreditation agency in Spain

RESUMEN. Las ingenierías constituyen una singularidad en los sistemas universitarios en todo el mundo. Fundamentalmente por la estrecha relación que tienen los estudios con las profesiones y con la responsabilidad que deriva de una actividad profesional cada día más compleja. Esto se amplifica con la reforma de Bolonia, que está ocurriendo en paralelo con un cambio económico y social profundo. La calidad de la educación superior es un asunto complicado especialmente cuando los sistemas educativos y acreditadores dependen de los gobiernos. La experiencia dice que en estos casos las entidades que garantizan la calidad tienen que dar respuestas válidas para los distintos campos de estudio con procesos y mecanismos generales que no permiten contemplar las múltiples peculiaridades de cada uno de ellos. Además esta dependencia gubernamental impide que los entes acreditadores puedan establecer acuerdos internacionales de reconocimiento multilateral con otras organizaciones de prestigio. Las ingenierías españolas están sufriendo algunas contradicciones pues a pesar del prestigio que tienen, se están encontrando internacionalmente con un reconocimiento académico y profesional insuficiente. En este artículo se reflexiona sobre la posibilidad de crear una agencia específica de acreditación para las ingenierías en España, analizando su compatibilidad con la legislación española y su posible aceptación e integración en los sistemas universitarios y profesionales.ABSTRACT. Engineering subjects take up a unique position within university systems around the world, essentially on account of the close relation between the studies and eventual professions and the responsibility that arises from an ever-increasingly complex professional activity. This is further heightened by the Bologna reforms taking place in the midst of wide-ranging economic and social changes. The quality of higher education is a complex matter, particularly when the educational and credit systems depend on government authorities. Experience shows that in these cases the organizations guaranteeing quality have to give a valid response to the different fields of study by using general processes and systems that fail to consider the multiple peculiarities of each area. This government dependency also prevents accreditation organizations from establishing international multilateral recognition agreements with other prestigious organizations. Spanish engineering studies are subject to certain contradictions and in spite of the esteem in which they are held, these are now gaining insufficient international academic and professional recognition. This article considers the possibility of creating a specific accreditation agency for engineering programmes in Spain and examines its compatibility with Spanish legislation and potential acceptance and incorporation within university and professional systems

Integrated electronic system for ultrasonic structural health monitoring

A fully integrated on-board electronic system that can perform in-situ structural health monitoring (SHM) of aircraft?s structures using specifically designed equipment for SHM based on guided wave ultrasonic method or Lamb waves? method is introduced. This equipment is called Phased Array Monitoring for Enhanced Life Assessment (PAMELA III) and is an essential part of overall PAMELA SHM? system. PAMELA III can generate any kind of excitation signals, acquire the response signals that propagate throughout the structure being tested, and perform the signal processing for damage detection directly on the structure without need to send the huge amount of raw signals but only the final SHM maps. It monitors the structure by means of an array of integrated Phased Array (PhA) transducers preferably bonded onto the host structure. The PAMELA III hardware for SHM mapping has been designed, built and subjected to laboratory tests, using aluminum and CFRP structures. The 12 channel system has been designed to be low weight (265 grams only), to have a small form factor, to be directly mounted above the integrated PhA transducers without need for cables and to be EMI protected so that the equipment can be taken on board an aircraft to perform required SHM analyses by use of embedded SHM algorithms. Moreover, the autonomous, automatic and on real-time working procedure makes it suitable for the avionic field, sending the corresponding alerts, maps and reports to external equipment

Integrated phased array transducer for on-board structural health monitoring

Permanently bonded onto a structure, an integrated Phased Array (PhA II) transducer that can provide reliable electromechanical connection with corresponding sophisticated miniaturized ?all in one? SHM electronic device installed directly above it, without need for any interface cabling, during all aerospace structure lifecycle phases and for a huge variety of real harsh service environments of structures to be monitored is presented. This integrated PhA II transducer [1], as a key component of the PAMELA SHM? (Phased Array Monitoring for Enhanced Life Assessment) system, has two principal tasks at the same time, reliably transceive elastic waves in real aerospace service environments and serves as a reliable sole carrier or support for associated integrated on-board SHM electronic device attached above. The PhA II transducer successfully accomplished both required task throughout extensive test campaigns which included low to high temperature tests, temperature cycling, mechanical loading, combined thermo- mechanical loading and vibration resistance, etc. both with and without SHM device attached above due to RTCA DO-160F

Structural health monitoring network system with wireless communications inside closed aerospace structures

Structural Health Monitoring (SHM) requires integrated "all in one" electronic devices capable of performing analysis of structural integrity and on-board damage detection in aircraft?s structures. PAMELA III (Phased Array Monitoring for Enhanced Life Assessment, version III) SHM embedded system is an example of this device type. This equipment is capable of generating excitation signals to be applied to an array of integrated piezoelectric Phased Array (PhA) transducers stuck to aircraft structure, acquiring the response signals, and carrying out the advanced signal processing to obtain SHM maps. PAMELA III is connected with a host computer in order to receive the configuration parameters and sending the obtained SHM maps, alarms and so on. This host can communicate with PAMELA III through an Ethernet interface. To avoid the use of wires where necessary, it is possible to add Wi-Fi capabilities to PAMELA III, connecting a Wi-Fi node working as a bridge, and to establish a wireless communication between PAMELA III and the host. However, in a real aircraft scenario, several PAMELA III devices must work together inside closed structures. In this situation, it is not possible for all PAMELA III devices to establish a wireless communication directly with the host, due to the signal attenuation caused by the different obstacles of the aircraft structure. To provide communication among all PAMELA III devices and the host, a wireless mesh network (WMN) system has been implemented inside a closed aluminum wingbox. In a WMN, as long as a node is connected to at least one other node, it will have full connectivity to the entire network because each mesh node forwards packets to other nodes in the network as required. Mesh protocols automatically determine the best route through the network and can dynamically reconfigure the network if a link drops out. The advantages and disadvantages on the use of a wireless mesh network system inside closed aerospace structures are discussed

Targeting lymphoid-derived IL-17 signaling to delay skin aging

Skin aging is characterized by structural and functional changes that contribute to age-associated frailty. This probably depends on synergy between alterations in the local niche and stem cell-intrinsic changes, underscored by proinflammatory microenvironments that drive pleotropic changes. The nature of these age-associated inflammatory cues, or how they affect tissue aging, is unknown. Based on single-cell RNA sequencing of the dermal compartment of mouse skin, we show a skew towards an IL-17-expressing phenotype of T helper cells, γδ T cells and innate lymphoid cells in aged skin. Importantly, in vivo blockade of IL-17 signaling during aging reduces the proinflammatory state of the skin, delaying the appearance of age-related traits. Mechanistically, aberrant IL-17 signals through NF-κB in epidermal cells to impair homeostatic functions while promoting an inflammatory state. Our results indicate that aged skin shows signs of chronic inflammation and that increased IL-17 signaling could be targeted to prevent age-associated skin ailments.© 2023. The Author(s)

Diferencia de presentación del síndrome coronario agudo por género en pacientes llevados al laboratorio de cateterismo en población dominicana: un estudio retrospectivo

Introducción: el síndrome coronario agudo (SCA) es una serie de signos y síntomas que se refieren a isquemia miocárdica repentina. Estas condiciones clínicas son Síndrome Coronario agudo sin Elevación del Segmento ST (SCASEST) y Síndrome Coronario Agudo con Elevación del Segmento ST (SCACEST). A nivel mundial hay hallazgos controversiales con respecto a la diferencia de presentación de SCA en hombres y mujeres. Objetivo: determinar las diferencias en presentación del síndrome coronario agudo según el género en República Dominicana. Métodos: en este estudio observacional retrospectivo unicéntrico, 3,548 pacientes con SCA llevados al laboratorio de cateterismo fueron observados durante el período de agosto de 2016 a septiembre de 2019. Resultados: la edad promedio de presentación fue mayor en las mujeres, con una media de 63 años (DE ± 12.2). El SCACEST fue más frecuente en hombres (69.35 %) y la Angina Inestable en mujeres (50.14 %, p <0.0001). Angiográficamente, la enfermedad coronaria multivascular fue más común en hombres y la angiografía coronaria normal en mujeres (41.30 % y 35.37 %, p <0.0001). Conclusión: dentro de la población dominicana, la mujer tiende a ser mayor al momento de presentación de SCA, con menor tendencia a someterse a intervención coronaria terapéutica