9 results on '"HEMERA"'
Search Results
2. From BEXUS to HEMERA: The application of lessons learned on the development and manufacturing of stratospheric payloads at S5Lab
- Author
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Marzioli, Paolo, Frezza, Lorenzo, Picci, Niccolò, Palo, Luigi di, Collettini, Luca, Garofalo, Riccardo, Bedetti, Emanuele, Curianò, Federico, Celesti, Paola, Nunzio, Clara di, Misercola, Linda, Gianfermo, Andrea, Graux, Alessandra, Zarcone, Gaetano, Piergentili, Fabrizio, Santoni, Fabio, Marzioli, Paolo, Frezza, Lorenzo, Picci, Niccolò, Palo, Luigi di, Collettini, Luca, Garofalo, Riccardo, Bedetti, Emanuele, Curianò, Federico, Celesti, Paola, Nunzio, Clara di, Misercola, Linda, Gianfermo, Andrea, Graux, Alessandra, Zarcone, Gaetano, Piergentili, Fabrizio, and Santoni, Fabio
- Abstract
In the last years the S5Lab (Sapienza Space Systems and Space Surveillance Laboratory) from Sapienza University of Rome has given to the students the opportunity to gather knowledge on stratospheric payloads by supporting the design and development of two experiments selected for the participation in the REXUS/BEXUS educational Programme, managed by three european space institutions. The insights and lessons learned gathered during the participations in the REXUS/BEXUS educational programme gave the possibility to the student to take part in the development of a third experiment in the frame of the professional research programme HEMERA and complete it successfully. STRATONAV (STRATOspheric NAVigation experiment) was a stratospheric experiment based on Software Defined Radios (SDRs) technology whose aim was the testing of the VOR (VHF Omnidirectional Range) navigation system, evaluating its performance above the standard service volume, which was launched on BEXUS 22 in October 2016. TARDIS (Tracking and Attitude Radio-based Determination In Stratosphere) was developed as a follow up of STRATONAV between 2018 and 2019. Similarly to its predecessor TARDIS was a stratospheric experiment aimed at exploiting the VOR signal, with the aid of SDRs, to perform in-flight attitude and position determination, and was launched on BEXUS 28 in October 2019. After the launch of TARDIS, a team composed both by former STRATONAV and TARDIS students was formed for the development of a third stratospheric experiment going by the name of STRAINS (Stratospheric Tracking Innovative Systems), conceived by Sapienza University of Rome and ALTEC and supported by ASI. STRAINS main objective was the proof of concept of the possibility of achieving the Time Difference of Arrival (TDOA) and the Frequency Difference of Arrival (FDOA) for navigation purposes with the aid of SDRs. The experiment was developed between 2020 and 2021 exploiting the lessons learned from the former team members of the tw
- Published
- 2022
3. RAD4 and RAD23/HMR Contribute to Arabidopsis UV Tolerance.
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Lahari, Triparna, Lazaro, Janelle, and Schroeder, Dana F.
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ARABIDOPSIS thaliana , *EFFECT of ultraviolet radiation on plants , *DNA damage , *GENETIC mutation , *DNA replication , *CELL death - Abstract
In plants, exposure to solar ultraviolet (UV) light is unavoidable, resulting in DNA damage. Damaged DNA causes mutations, replication arrest, and cell death, thus efficient repair of the damaged DNA is essential. A light-independent DNA repair pathway called nucleotide excision repair (NER) is conserved throughout evolution. For example, the damaged DNA-binding protein Radiation sensitive 4 (Rad4) in Saccharomyces cerevisiae is homologous to the mammalian NER protein Xeroderma Pigmentosum complementation group C (XPC). In this study, we examined the role of the Arabidopsis thaliana Rad4/XPC homologue (AtRAD4) in plant UV tolerance by generating overexpression lines. AtRAD4 overexpression, both with and without an N-terminal yellow fluorescent protein (YFP) tag, resulted in increased UV tolerance. YFP-RAD4 localized to the nucleus, and UV treatment did not alter this localization. We also used yeast two-hybrid analysis to examine the interaction of AtRAD4 with Arabidopsis RAD23 and found that RAD4 interacted with RAD23B as well as with the structurally similar protein HEMERA (HMR). In addition, we found that hmr and rad23 mutants exhibited increased UV sensitivity. Thus, our analysis suggests a role for RAD4 and RAD23/HMR in plant UV tolerance. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
4. Study of tubular daylight guide systems in buildings: Experimentation, modelling and validation.
- Author
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Malet-Damour, Bruno, Guichard, Stéphane, Bigot, Dimitri, and Boyer, Harry
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BUILDING design & construction , *LIGHT pipes , *EXTERIOR lighting , *ENERGY conservation in buildings , *ENERGY consumption of buildings , *CONSTRUCTION industry - Abstract
In a concerning global energy context, the construction industry must be able to respond both in terms of energy management and the comfort of its buildings’ occupants. In this context, innovative devices using daylighting can provide an obvious answer. The Tubular Devices Guide Systems (TDGS) are innovative daylighting processes based on light transport. They offer a real response to the diurnal energy consumption (frequently in tertiary). However, today's design will make tomorrow's building. This is why it is necessary to better adjust our prediction tools to optimize the use of these technologies and their coupling to active processes (artificial lighting). The literature reveals a disparity in performance prediction tools for light pipes. Two causes are targeted: the adjustment of semi-empirical models and their accuracy. This article offers some solutions to both problems. We propose a new form of model (improved accuracy) associated with a generalized modelling protocol (response to the adjustment) through a model generator named HEMERA. Our approach is organized around a Galilean sequence, i.e., we rely on observation and results of an experimental study in real weather conditions to better understand the phenomena and validate the developed model. Energy autonomy and user comfort in the building are at the heart of our concern, and we will provide evidence to validate the use of TDGS in buildings. In this context, we propose an energy equivalence between the light pipe and artificial lighting. [ABSTRACT FROM AUTHOR]
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- 2016
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- View/download PDF
5. The ECAPS Experiment for Solar Cell Characterization in the Stratosphere
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Marcuccio, S., Gemignani, M., Cataldi, G., Gregucci, S., and Andrenacci, M.
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photovoltaics ,High-Altitude Balloon ,solar cells ,HAPS ,stratospheric balloon ,HEMERA ,stratospheric balloon, solar cells, HEMERA, photovoltaics, HAPS, High-Altitude Balloon, High-Altitude Pseudo-Satellite ,High-Altitude Pseudo-Satellite - Published
- 2021
6. Innovative tracking systems test on-board a stratospheric balloon: the STraIns experiment
- Author
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Marzioli, P., Frezza, L., Amadio, D., Santoro, F., Romanelli, C., fabrizio piergentili, and Santoni, F.
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stratosphere ,stratospheric balloon ,tdoa ,fdoa ,hemera ,tracking - Published
- 2019
7. Contribution À L’Étude Des Dispositifs De Guides Lumineux Tubulaires (D.G.L.T.) Appliqués Au Bâtiment:Expérimentation, Modélisation et Validation
- Author
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Malet-Damour, Bruno, STAR, ABES, Physique et Ingénierie Mathématique pour l'Énergie, l'environnemeNt et le bâtimenT (PIMENT), Université de La Réunion (UR), Université de la Réunion, and Harry Boyer
- Subjects
Générateur de modèle ,[PHYS.PHYS.PHYS-OPTICS] Physics [physics]/Physics [physics]/Optics [physics.optics] ,Climate Empirical Coefficients (CEC) ,[SPI.OPTI] Engineering Sciences [physics]/Optics / Photonic ,Économie d’énergie ,[SPI.GCIV.CD] Engineering Sciences [physics]/Civil Engineering/Construction durable ,Energy savings ,Climate Empirical Coefficients ,Coefficients Empiriques Climatiques (CEC) ,Éclairement naturel ,[SDU.STU.CL] Sciences of the Universe [physics]/Earth Sciences/Climatology ,Codyrun ,Light Pipe ,Bâtiment ,Building ,[PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det] ,Hemera ,TDGS ,[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics] ,[SHS.ARCHI]Humanities and Social Sciences/Architecture, space management ,[SPI.GCIV.CD]Engineering Sciences [physics]/Civil Engineering/Construction durable ,DGLT ,Shadeco ,[SPI.NRJ]Engineering Sciences [physics]/Electric power ,Cœfficients empiriques climatiques ,[SPI.GCIV.EC] Engineering Sciences [physics]/Civil Engineering/Eco-conception ,Conduit de lumière (DGLT) ,[PHYS.COND.CM-MS] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] ,Conduit de lumière ,Model generator ,[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology ,[PHYS.PHYS.PHYS-INS-DET] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det] ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] ,Daylight ,[SHS.ARCHI] Humanities and Social Sciences/Architecture, space management ,[SPI.GCIV.EC]Engineering Sciences [physics]/Civil Engineering/Eco-conception ,[SPI.NRJ] Engineering Sciences [physics]/Electric power - Abstract
Designing a building with comfort and energy conservation concerns is a key issue. In the alarming global context, both on energy-climate that the building sector is singled out. In France, the lighting is among the poor performers compared to other European countries. The country lags behind in quality tertiary or residential lighting in terms of energy performance, visual comfort or health. The organization of "2015, Année de la Lumière en France" by the ONU, UNESCO and the CNOP shows a change which tends to take place in the popular consciousness. Reunion Island, considering its strong solar radiation, is a land of choice to experiment with innovative devices in the contribution of daylight in buildings. For this purpose, the physical approach of the phenomenon provides prediction prospects, where the theoretical study of today will be tomorrow's building. Starting with a generalist approach, this PhD thesis aims to be as comprehensive as possible in the literature review, experimental and modelling study of the TDGS (Tubular Daylight Guide Systems) applied to the building. Our bibliographic survey has revealed that, this process is commonly marketed and installed internationally on the buildings concerned about their environmental impact or well-being of their occupants. However, the literature also shows they are poorly studied, and the approaches cannot be applied to all types of climates. In this context, a full-scale experimental study, including many scenarios was conducted to understand the phenomena involved.The semi-empirical modelling has both strengths and weaknesses. With simplicity, it remains limited to a configuration or a particular climate. In this issue, this research offers a solution: a numeric tool of dedicated modelling environment, ensuring the generation of the models according to need, called HEMERA. It uses the power of genetic algorithms to provide an effective solution to a local problem. The computer code CODYRUN is the support of the validation of the model developed as part of this work, and adjusted specifically for the climate of Reunion Island. This software profits an experience and a development of over 20 years in the PIMENT laboratory., Concevoir un bâtiment avec des préoccupations de confort et de maitrise de l'énergie est un enjeu primordial. Dans le contexte mondial alarmant, tant sur le plan énergétique que climatique, le secteur du bâtiment est pointé du doigt. En France, l'éclairage fait partie des mauvais élèves comparés aux autres pays européens. Le pays accuse un certain retard dans la qualité de l'éclairage tertiaire ou résidentiel en termes de performance énergétique, confort visuel ou santé au travail. L'organisation de « 2015, Année de la Lumière en France » par l'ONU, l'UNESCO et le CNOP montre qu'un changement tend à s'opérer dans les consciences. L'île de La Réunion, compte tenu de son fort gisement solaire, est une terre de choix pour expérimenter des dispositifs novateurs dans l'apport de lumière naturelle au sein des bâtiments. Pour cela, l'approche physique du phénomène offre des perspectives de prédiction où l'étude théorique d'aujourd’hui fera le bâtiment de demain. En débutant par une approche généraliste, ce manuscrit de thèse se veut être le plus exhaustif possible dans l'étude bibliographique, expérimentale et modélisation du comportement des DGLT-R (Dispositifs de Guides Lumineux Tubulaires Réfléchissants) appliqués au bâtiment. Notre prospection bibliographique nous a révélé que ce procédé est couramment commercialisé et installé à l'échelle internationale sur les bâtiments soucieux de leur impact environnemental ou du bien-être de leurs occupants. Cependant, la littérature montre également qu'ils sont peu étudiés et que les approches ne peuvent être appliquées à tous types de climats. Dans ce cadre, une étude expérimentale à échelle réelle, comprenant de nombreux scénarios, a été menée en vue de créer une base de données de mesures expérimentales unique et comprendre les phénomènes mis en jeu. La modélisation semi-empirique possède à la fois des atouts et des inconvénients. Forte de simplicité, elle reste toutefois limitée à une configuration ou un climat particulier. À cette problématique, ces travaux de recherche offrent une solution : un outil numérique de modélisation dédié, assurant la génération des modèles au départ de mesures à effectuer, nommé HEMERA. Il utilise la puissance des algorithmes génétiques pour offrir une solution efficace à un problème local. Le code de calcul CODYRUN est le support de validation du modèle généré pour le climat de La Réunion. Ce code de calcul bénéficie d'une expérience et d'un développement de plus de 20 ans au sein du laboratoire PIMENT.
- Published
- 2015
8. Contribution à l’étude des Dispositifs de Guide Lumineux Tubulaires appliqués au Bâtiment : Expérimentation, Modélisation, Validation et Applications
- Author
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Malet-Damour, Bruno, Boyer, Harry, Malet-Damour, Bruno, Physique et Ingénierie Mathématique pour l'Énergie, l'environnemeNt et le bâtimenT (PIMENT), Université de La Réunion (UR), and Laboratoire PIMENT
- Subjects
[PHYS.PHYS.PHYS-OPTICS] Physics [physics]/Physics [physics]/Optics [physics.optics] ,[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics] ,[SHS.ARCHI]Humanities and Social Sciences/Architecture, space management ,[SPI.GCIV.CD]Engineering Sciences [physics]/Civil Engineering/Construction durable ,[SPI.OPTI] Engineering Sciences [physics]/Optics / Photonic ,générateur de modèles ,Photométrie ,HEMERA ,[SPI.GCIV.CD] Engineering Sciences [physics]/Civil Engineering/Construction durable ,[SPI.GCIV.EC] Engineering Sciences [physics]/Civil Engineering/Eco-conception ,CODYRUN ,algorithme d'apprentissage ,Conduit de lumière ,Ingénierie ,Éclairement naturel ,[SDU.STU.CL] Sciences of the Universe [physics]/Earth Sciences/Climatology ,algorithme d'optimisation ,[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology ,[PHYS.PHYS.PHYS-INS-DET] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det] ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,[PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det] ,[SHS.ARCHI] Humanities and Social Sciences/Architecture, space management ,Eclairagisme ,[SPI.GCIV.EC]Engineering Sciences [physics]/Civil Engineering/Eco-conception - Abstract
Ce poster présente les travaux de thèse de Bruno Malet-Damour initiés en novembre 2012. Sa thèse traite de la modélisation des phénomènes physiques liés à l'éclairement. Plus précisément, le sujet s'oriente vers la prédiction des performances de dispositifs innovants tels que les conduits de lumière. Ce procédé est couramment installé sur les bâtiments soucieux de leur impact environnemental ou du bien-être de leurs occupants. Cependant, la littérature révèle qu’ils sont peu étudiés. De plus, les approches reconnues ne peuvent pas être appliquées à tout type de climat. Suite à ce bilan, nous souhaitons créer un modèle semi-empirique généralisable. Celui-ci contiendra des paramètres qu’il faudra ajuster par optimisation. Pour se faire, nous utiliserons des données météorologiques de la zone géographique étudiée ainsi que la configuration géométrique et optique de l’étude (type de conduit, dimensions de la cellule, etc.). Dans ce cadre, une étude expérimentale à échelle réelle a été menée, comprenant de nombreux scenarii d’étude. Deux codes de calcul, développés au sein du laboratoire PIMENT, serviront de supports numériques : - HEMERA : logiciel en photométrie simulant un monozone à multi-composants (conduit de lumière, vitrage, éclairage artificiel, etc.). Grâce à son couplage à un algorithme d’optimisation, il permet d’ajuster les paramètres de notre modèle pour notre zone géographique et notre conduit de lumière. HEMERA devient un « générateur de modèles ».- CODYRUN : logiciel de simulation numérique en thermique et photométrie du bâtiment. Dans le cadre de ces travaux de recherche, il intégrera le modèle développé pour la Réunion. Il donnera des éléments de validation pour notre approche (via une validation comparative : confrontation interlogicielle, confrontation expérimentale, confrontation intermodèle).La thématique de recherche étant liée au milieu de l'ingénierie, nous testerons notre modèle sur des cas d’étude concrets (bâtiments PROFIL au Campus du Moufia).
- Published
- 2015
9. Photoactivated phytochromes interact with HEMERA and promote its accumulation to establish photomorphogenesis in Arabidopsis.
- Author
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Galvão, Rafaelo M., Meina Li, Kothadia, Sonya M., Haskel, Jonathan D., Decker, Peter V., Van Buskirk, Elise K., and Meng Chen
- Subjects
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PHYTOCHROMES , *PLANT development , *PHOTORECEPTORS , *CYTOPLASM , *ARABIDOPSIS , *PLANT photomorphogenesis - Abstract
Plant development is profoundly regulated by ambient light cues through the red/far-red photoreceptors, the phytochromes. Early phytochrome signaling events include the translocation of phytochromes from the cytoplasm to subnuclear domains called photobodies and the degradation of antagonistically acting phytochrome-interacting factors (PIFs). We recently identified a key phytochrome signaling component, HEMERA (HMR), that is essential for both phytochrome B (phyB) localization to photobodies and PIF degradation. However, the signaling mechanism linking phytochromes and HMR is unknown. Here we show that phytochromes directly interact with HMR to promote HMR protein accumulation in the light. HMR binds more strongly to the active form of phytochromes. This interaction is mediated by the photosensory domains of phytochromes and two phytochrome-interacting regions in HMR. Missense mutations in either HMR or phyB that alter the phytochrome/HMR interaction can also change HMR levels and photomorphogenetic responses. HMR accumulation in a constitutively active phyB mutant (YHB) is required for YHB-dependent PIF3 degradation in the dark. Our genetic and biochemical studies strongly support a novel phytochrome signaling mechanism in which photoactivated phytochromes directly interact with HMR and promote HMR accumulation, which in turn mediates the formation of photobodies and the degradation of PIFs to establish photomorphogenesis. [ABSTRACT FROM AUTHOR]
- Published
- 2012
- Full Text
- View/download PDF
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