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Littérature scientifique sur le sujet « Rito camerale »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Rito camerale"

Lin, Tzung-Han, Yu-Lun Liu, Chi-Cheng Lee et Hsuan-Kai Huang. « A camera array system based on DSLR cameras for autostereoscopic prints ». Electronic Imaging 2020, n^o 2 (26 janvier 2020) : 155–1. http://dx.doi.org/10.2352/issn.2470-1173.2020.2.sda-155.

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In this paper, we present a multi-view camera-array system by using commercial DSLR cameras. In order to produce quality autostereoscopic prints, we initially calibrated the color based on X-Rite color-checker, then automatically adjust the alignment of all images by one black-white checker. In this system, we also utilized an external electronic trigger based on Arduino for synchronizing all cameras to generate bullet-time effect photos. Finally, we converted all photos into multiplexed images then printed them on a lenticular lens panel to be an autostereoscopic photo frame.

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Mariani, Patrizio. « Jellyfish Identification Software for Underwater Laser Cameras (JTRACK) ». Research Ideas and Outcomes 4 (28 février 2018) : e24716. http://dx.doi.org/10.3897/rio.4.e24716.

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Jellyfish can form erratic blooms in response to seasonal and irregular changes in environmental conditions with often large, transient effects on local ecosystem structure as well as effects on several sectors of the marine and maritime economy. Early warning systems able to detect conditions for jelly fish proliferation can enable management responses to mitigate such effects providing benefit to local ecosystems and economies. We propose here the creation of a research team in response to the EU call for proposal under the European Maritime and Fisheries Fund called “Blue Labs: innovative solutions for maritime challenges”. The project will establish a BLUELAB team with a strong cross-sectorial component that will benefit of the expertise of researchers in IT and Marine Biology, Computer Vision and embedded systems, which will work in collaboration with Industry and Policy maker to develop an early warning system using a new underwater imaging system based on Time of Flight Laser cameras. The camera will be combined to machine learning algorithm allowing autonomous early detection of jellyfish species (e.g. polyp, ephyra and planula stages). The team will develop the system and the companion software and will demonstrate its applications in real case conditions.

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Cruz-Marrero, Wilmelie, Chelsea A. Harms-Tuohy, Richard S. Appeldoorn et Bradley G. Stevens. « Comparison of video camera sled with diver surveys for queen conch Lobatus gigas density estimates in the west coast of Puerto Rico ». Bulletin of Marine Science 96, n^o 4 (1 octobre 2020) : 641–54. http://dx.doi.org/10.5343/bms.2019.0087.

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Queen conch Lobatus gigas is one the most important fishery species in the Caribbean. Currently, queen conch harvest is prohibited in the Exclusive Economic Zone (EEZ) in Puerto Rico. Since 1996, abundance estimates in Puerto Rico have been conducted by scuba divers at intervals of 5 yrs. Yet diver surveys are limited by depth and time. In contrast, underwater video or camera surveys are not constrained by these factors and also provide a permanent photo record of observations. We conducted a survey of queen conch density on the western shelf of Puerto Rico in 2016 using two different methods: divers and a camera sled. Divers surveyed eight transects of 2–3 km using diver propulsion vehicles and standardized, historical methods. The camera sled was fitted with a digital camera, synchronized strobe lights, and paired lasers, and was towed along the dive transects several days later. Conch densities (conch ha–1) estimated with the camera sled were significantly higher than those estimated by diver survey methods, while mean length was smaller. Both results were driven by the higher selectivity of the sled method for smaller conch. These results may lead to further applications or development of sled survey techniques, and improved data collection and analysis that can be used for management of queen conch in the Caribbean.

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Tatayo Vinueza, Edison, et Ricardo Llugsi Cañar. « Implementación de una mini-red de sensores inalámbricos para detección temprana de incendios forestales ». Revista de Investigación en Tecnologías de la Información 10, n^o 21 (septembre 2022) : 88–99. http://dx.doi.org/10.36825/riti.10.21.008.

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This article presents the implementation of an early warning system in the event of a forest fire, avoiding the loss of extensive wooded areas, flora, fauna, and health conditions of inhabitants surrounding the affected areas. The mini network has at its core Raspberry Pi cards in the Zero and 2B+ versions for processing environment data and XBee S3B wireless communication modules for interconnection between the transmitter and coordinator nodes. This solution takes advantage of the high processing capacity of the Raspberry Pi platform and the low energy consumption of the sensors and wireless communication modules, resulting in an autonomous, portable, rapid deployment and low-cost system, additionally with the purpose of verifying and to visually discriminate the presence of an outbreak of fire, camera modules are inserted that allow images to be captured, which are stored on a web server hosted in the cloud. To analyze the performance and proper location of the nodes that make up the mini-network, in situ measurements are made to assess the maximum coverage area and packet loss during ZigBee wireless transmission, resulting in a reliable, autonomous alert system. and low cost.

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Thompson, Krista A. « Performing Visibility : Freaknic and the Spatial Politics of Sexuality, Race, and Class in Atlanta ». TDR/The Drama Review 51, n^o 4 (décembre 2007) : 24–46. http://dx.doi.org/10.1162/dram.2007.51.4.24.

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During the late 1990s, participants in Freaknic, the annual black college spring break gathering, were greeted by the Atlanta police in riot gear. Defying the police, women gave impromptu performances, sometimes stripping for participants' cameras. Thompson shows how these performances were a response not only to the city's treatment of Freaknic but also to Atlanta's long history of using force to control race, gender, and class.

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Rivera-Hernández, Diego F., Julián A. Durand-González, Clara E. Isaza et Mauricio Cabrera-Ríos. « Augmented reality to guide pedestrian evacuation in earthquake events ». Ingenierias 26, n^o 94 (30 janvier 2023) : 59–63. http://dx.doi.org/10.29105/ingenierias26.94-793.

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Augmented Reality is a promising technology to support safe pedestrian evacuation from buildings during earthquakes. The widespread availability of phone cameras makes this idea feasible. QR codes, for instance, can place virtual three-dimensional objects to guide people along a prescribed route. In this work, a prototypical system based on this premise was created in response to the 2020 sudden surge in seismic activity in Puerto Rico. The results point towards feasibility as well as to a series of areas that require improvement for a real-life implementation.

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Sapkota, Rituraj. « FRONTLINE 2 : The NZ Parliament protest : What the cameras in the crowd witnessed ». Pacific Journalism Review : Te Koakoa 28, n^o 1 & 2 (31 juillet 2022) : 114–22. http://dx.doi.org/10.24135/pjr.v28i1and2.1247.

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Commentary: Aotearoa New Zealand’s Parliament grounds have been reclaimed. All the streets around the buildings are again open to the public. Te Āti Awa have held a karakia to reinstall the mauri of the land. There is currently a rāhui over the Parliament grounds. It is time for healing. And moving on, writes a Māori Television videographer on reflection about the unprecedented hate directed at news media during the three-week occupation by anti-public health measures protesters. But after the unprecedented chaos that ended in a riot on Day 23—2 March 2022—he quotes a journalist who said, ‘I was feeling sad ... And then I look at Ukraine and realise there are bombs going off next to all these journalists and camera operators. I got hit with a camping chair and am I going to sit around and complain about it?

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Porto, L. R., N. N. Imai, A. M. G. Tommaselli et L. Salvador Neto. « RADIOMETRIC CALIBRATION PERFORMANCE OF A MULTISPECTRAL CAMERA WITH A SINGLE SENSOR AND MULTIPLE HEADS ». International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B1-2022 (30 mai 2022) : 17–22. http://dx.doi.org/10.5194/isprs-archives-xliii-b1-2022-17-2022.

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Abstract. Radiometric calibration of remote sensing images can be performed with many existing techniques. The selected method depends on the sensor type, application and user's prior knowledge. The main objective of this study was to analyse the radiometric calibration technique proposed by Agrowing to process the data acquired for a multispectral camera with a single sensor and multiple heads. This radiometric calibration can be done in a simple way by a regular user and just needs an image from the X- rite Classic 24, a small panel with 24 colours, under the same viewing angle as the data acquisition. The dual-head camera was used to acquire images in two illumination conditions. The non-calibrated and calibrated DN pixels values were evaluated by comparing the reflectance factor calculated from radiance measurement, acquired by a ASD spectrometer followed by a linear adjustment. The results show that in the visible bands the non-calibrated and calibrated DN have a strong correlation with ASD reflectance factor. The NIR band presents the weakest correlation, but with a slight improvement after the radiometric calibration. The red-edge band presented a larger improvement with the application of the calibration procedure.

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Severiche, Guillermo. « Cuerpos que caen, cuerpos que sienten. Archivo familiar, memoria queer y lenguaje háptico en tres documentales recientes de América Latina ». Clepsydra. Revista de Estudios de Género y Teoría Feminista 21 (2021) : 187–202. http://dx.doi.org/10.25145/j.clepsydra.2021.21.09.

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This essay compares the formal elements shared by three recent documentaries from Latin America: 108 (dir. Renate Costa, Paraguay, 2010), Memories of a Penitent Heart (dir. Cecilia Aldarondo, Puerto Rico, 2016), and Silence is a Falling Body (dir. Agustina Comedi, Argentina, 2017). Based on Laura Marks and Vivian Sobchack’s contributions, it is possible to affirm that these films recreate the physical presence of absent subjects by using haptic language and other cinematographic tools that reconstruct a past affective network. To do so, the films use three distinctive resources: 1) the capture of tactile objects that pass from hand to hand and that evoke a physical presence, 2) the use of images from personal archives and 3) the intervention or experimentation of images, either from the archive or from the director’s own camera, to evoke an unrecovered memory.

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Aximoff, Izar, Cecilia Cronemberger et Fabiane de Aguiar Pereira. « Long-term survey by camera traps of non-volant mammals in two national parks in Rio de Janeiro State ». Oecologia Australis 19, n^o 01 (octobre 2015) : 215–31. http://dx.doi.org/10.4257/oeco.2015.1901.14.

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Thèses sur le sujet "Rito camerale"

TARRICONE, SILVIA. « L'effettività della tutela giurisdizionale civile minorile. Premesse per uno studio ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2010. http://hdl.handle.net/10281/7885.

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Lo studio condotto si propone di osservare il sistema delle tutele giurisdizionali civili minorili, mettendone in evidenza i punti di maggiore criticità. La ricerca viene condotta assumendo a criterio guida il principio di effettività della tutela giurisdizionale, ricostruito nei suoi formanti, attingendo all'elaborazione dottrinale e giurisprudenziale per l'assenza di un'espressa definizione normativa. Individuateni i corollari minimi nel c.d. principio dell'accesso al Giudice, del giusto processo e dell'utilità del rimedio giurisdizionale, l'indagine prosegue tra spazio giuridico interno e sovranazionale, ricostruendo la soggettività giuridica del minore ed esaminando alcune tra le questioni che il dibattito scientifico evidenzia in argomento.Il sindacato sul tema di indagine prescelto prosegue, affrontando l'esame dei temi della competenza in materia minorile, del rito e delle garanzie fondamentali del processo e dell'esecuzione ed attuazione dei provvedimenti. Lo studio si conclude con la formulazione di alcune perfettibili soluzioni di riforma del sistema osservato che esprimano i principi sanciti anche nel consesso sovranazionale e garantiscano al soggetto in formazione di ottenere per il tramite del rimedio giurisdizionale "tutto quello e proprio quello che ha diritto di ottenere".

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Jorge, Maria Carolina Lyra. « Avaliação de qualidade de fragmentos de cerrado e floresta semidecídua na região da bacia do rio Mogi-Guaçú com base na ocorrência de carnívoros ». Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/41/41134/tde-07022008-134102/.

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A perda de habitats é, atualmente, a grande ameaça à diversidade de vertebrados terrestres (Crooks, 2002). Muito pouco resta da vegetação nativa no estado de São Paulo, uma vez que é o estado mais desenvolvido do Brasil. Embora sua porção litorânea ainda possua uma grande faixa de Floresta Atlântica, o que restou da vegetação de cerrado em seu interior são pequenos fragmentos, cercados de agricultura e silvicultura. Entretanto, este mosaico de vegetação ainda abriga espécies de médios e grandes mamíferos. Este estudo foi desenvolvido numa área com fragmentos de cerradão, cerrado sensu stricto, floresta semidecídua, além de cultivos de eucalipto e cana-de-açúcar, nos municípios de Santa Rita do Passa-Quatro e Luiz Antônio. Registraram-se 22 espécies de mamíferos de médio e grande porte por meio de armadilhamento fotográfico, canteiro de pegadas, identificação de fezes, vestígios e avistamentos diretos. Dessas 22 espécies, dez eram carnívoros os quais exploravam o ambiente independentemente de sua cobertura vegetal. Numa abordagem mais espacializada notou-se alguma diferença no uso dos habitats da área de estudo, inclusive do eucaliptal, que se mostrou um habitat importante na dinâmica das populações de carnívoros do local. Dessa forma concluiu-se que ambientes modificados pelas culturas humanas podem representar habitats efetivamente utilizados pela mastofauna de uma região antropizada. Diferentes métodos podem ser usados para monitorar populações ou comunidades faunísticas. O armadilhamento fotográfico e o registro em canteiro de pegadas são bastante utilizados para médios e grandes mamíferos. Os dois métodos possuem viéses na sua amostragem, além de custos e eficiências bem distintos, no entanto o uso conjunto desses dois métodos parece registrar de forma adeqüada a riqueza da mastofauna de uma determinada região.
Habitat\'s loss is the great jeopardy to the diversity of terrestrial vertebrates nowadays (Crooks, 2002). There\'s too little left from the native vegetation in São Paulo State, since it\'s the most developed state in Brazil. Although its coastal area still has a large tract of the Atlantic Forest, just small patches of Brazilian savanna (cerrado) vegetation are found in it, surrounded by agriculture and silviculture. However this vegetation mosaic still shelters both medium and large mammals\' species. This study was held in an area with remnant fragments of woodland savanna (cerradão), cerrado sensu stricto, semideciduous forest as well the cultivation of eucalyptus and sugar-cane in Santa Rita do Passa-Quatro e Luiz Antônio - Brazil. Twenty-two species of large and medium sized mammals were reported by the use of camera trapping, track plots recording, identification of dungs, vestiges and sights. Among these 22 species, ten were carnivore which exploit the environment regardless its vegetation coverage. During a more spatial approach, some difference in the use of the habitats was noted, concerning the study area, including the eucalyptus plantation, which turned out to be an important habitat on the dynamics of the carnivore population of the region. Thus one realizes that environments which were altered by human cultures can represent habitats actually used by mammals from an anthropogenic region. Different procedures can be applied to observe faunal populations or communities. The camera trapping and the track plot recording are often used for medium and large-sized mammals. Both methods present bias in their showing, besides these 2 methods seem to be suitable to the register the wealth of the mammals of a specific region.

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Cloete, Laura. « Both sides of the camera : anthropology and video in the study of a Gcaleka women's rite called Intonjane ». Thesis, 2015. http://hdl.handle.net/10539/16935.

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This thesis explores the potential of video as a research tool for anthropologists in the recording of a single ritual. The study examines interactions between ethnographers, informants and viewers. The thesis reveals the capacity of video to make possible close, detailed readings of performance in terms not originally anticipated by the researcher. Archival storage of the video recording allows for critique and assessment of the research. The case study chosen in which to test the potential of \ dcso as a research tool was a woman's 'initiation' r^L'ial (called inton jane) in Shixini in the Eastern Gape (in what was, until recently, the independent homeland of Transkei). Historically, the ritual was supposedly held at the time of a girl's first menstruation, this being the physical symbol of her transformation into adulthood. Ritual seclusion served to effect an accompanying social transformation in preparation for marriage. Paradoxically, in the late 1980's, it was older women and mothers, already married and well past the age of first menstruation, who were undergoing the ritual seclusion and symbolic marriage. The study explores this paradox with the goal of understanding the purpose of the ritual in contemporary times. By recording large segments of the ritual on video, and subjecting the footage to a close analysis of verbal and non-verbal aspects of performance, both the ritual and the merits of video as a research tool could be examined. Video was utilised, in an interactive research process, as an information elicitation tool. The analysis of the recorded text of the ritual brings to the fore elements which make what is apparently a paradox understandable. The elements which explicate the paradox were not anticipated when the research commenced, and in all likelihood would have eluded a researcher who did not have the benefit of the incidental capture on video. The thesis reveals the enormous Contribution video can make to research and suggests that video has an important contribution to make to the discipline of anthropology.

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Livres sur le sujet "Rito camerale"

Florio, Antonella Di. Volontaria giurisdizione e rito camerale. Milano : Giuffrè, 2004.

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Chiara, Giuseppe Di. Il contraddittorio nei riti camerali. Milano : A. Giuffrè, 1994.

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Manuale Di Diritto Processuale Civile : I Riti Speciali, le Tutele Sommarie e Camerale e I Riti Semplificati. Independently Published, 2020.

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Chapitres de livres sur le sujet "Rito camerale"

Miklitsch, Robert. « The Phenix City Story ». Dans I Died a Million Times, 52–76. University of Illinois Press, 2020. http://dx.doi.org/10.5622/illinois/9780252043611.003.0003.

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In Phil Karlson’s The Brothers Rico (1955), Eddie Rico is a legitimate businessman who cannot extricate himself from the tentacles of the syndicate. Stylistically speaking, The Brothers Rico mirrors the emerging impact of television on the classic noir series registered most dramatically in Jack Arnold’s 3-D noir, The Glass Web (1953). However, if the camera setups in Karlson’s film appear more functional than not relative to ’40s classic noir, Bernard Guffey’s cinematography is inseparable from the film’s conceit: that organized crime is indistinguishable from corporate America. The South Floridian setting of The Brothers Rico is central to its sun-drenched, coruscating vision of late ’50s America. Unlike The Enforcer and The Captive City, which are set in the East and Midwest, respectively, Karlson’s film is set in the South, the West, and the Southwest. These sunbelt locations may seem antithetical to the inky-black look of classic noir, but the reason is as simple as it is profound: crime is not just here or there; it’s everywhere.

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Paterson, Mark. « Seeing with the Tongue : Sight through Other Means ». Dans Seeing with the Hands. Edinburgh University Press, 2016. http://dx.doi.org/10.3366/edinburgh/9781474405317.003.0008.

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Can a conceptual framework developed to theorize one sense modality generalise to transfers between other modalities? Expanding from the formulation of Molyneux’s original question about vision and touch, or eyes and hands, this chapter concerns research in the technology of sensory substitution. Paul Bach-y-Rita has experimented since the 1960s with his TVSS (Tactile-Visual Sensory Substitution) devices which transcode optical information from a camera feed onto the surface of the tongue and the back. Recent examples such as the BrainPort™ by WICAB (a spinoff of Bach-Y-Rita’s lab) leads to insights into the nature of ‘seeing’, extends the Molyneux problem into more recent technological territory, and speaks to the possibilities of cross-modal perception raised throughout the book.

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Shahab Uddin, Mohammad, et Jiang Li. « Generative Adversarial Networks for Visible to Infrared Video Conversion ». Dans Recent Advances in Image Restoration with Applications to Real World Problems. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.93866.

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Deep learning models are data driven. For example, the most popular convolutional neural network (CNN) model used for image classification or object detection requires large labeled databases for training to achieve competitive performances. This requirement is not difficult to be satisfied in the visible domain since there are lots of labeled video and image databases available nowadays. However, given the less popularity of infrared (IR) camera, the availability of labeled infrared videos or image databases is limited. Therefore, training deep learning models in infrared domain is still challenging. In this chapter, we applied the pix2pix generative adversarial network (Pix2Pix GAN) and cycle-consistent GAN (Cycle GAN) models to convert visible videos to infrared videos. The Pix2Pix GAN model requires visible-infrared image pairs for training while the Cycle GAN relaxes this constraint and requires only unpaired images from both domains. We applied the two models to an open-source database where visible and infrared videos provided by the signal multimedia and telecommunications laboratory at the Federal University of Rio de Janeiro. We evaluated conversion results by performance metrics including Inception Score (IS), Frechet Inception Distance (FID) and Kernel Inception Distance (KID). Our experiments suggest that cycle-consistent GAN is more effective than pix2pix GAN for generating IR images from optical images.

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Arias-Gutierrez, Ruth, Andrés Tapia et Juan Pablo Reyes Puig. « Conservation Status of Macro Mammals in the Llanganates-Sangay Ecological Corridor and Anzu River Subbasin ». Dans Tropical Forests - Ecology, Diversity and Conservation Status [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.109332.

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With rapid ecological assessments, we diagnose the conservation status of large mammals in the localities Rio Encanto, San Jacinto Las Palmas, Sacha Llanganates, Cabeceras del Anzu, Boayaku, and Flor de Bosque, located within the Llanganates Sangay Ecological Corridor (CELS) and the upper subbasin of the Anzu River, in the eastern foothills of the tropical Andes, sub-Andean and tropical ecosystems in one of the most biologically diverse regions of Ecuador. Camera traps, 5 km linear transect walks, and interviews with local inhabitants recorded 35 species of macro mammals, in 8 Orders and 21 Families, including the Andean bear (Tremarctos ornatus), Andean tapir (Tapirus pinchaque), Amazonian tapir (Tapirus terrestris), puma (Puma concolor), and chorongo monkey (Lagothrix lagotricha), mammals considered as flagship species, highly endangered. The continuity of natural habitat along the subbasins of the Encanto, Topo, Zuñag, Tigre, and Anzu rivers, as well as the mountain ranges toward the highlands, provide favorable conditions for the flow of individuals, from adjacent areas of the Llanganates and Sangay National Parks to partially protected forest areas, such as the private reserves of Fundation Ecominga, Sumak Kawsay in Situ, community reserves of Boayaku and Flor de Bosque. The protection of the area is a priority.

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Actes de conférences sur le sujet "Rito camerale"

Lambrecht, Jens. « Robust Few-Shot Pose Estimation of Articulated Robots using Monocular Cameras and Deep-Learning-based Keypoint Detection ». Dans 2019 7th International Conference on Robot Intelligence Technology and Applications (RiTA). IEEE, 2019. http://dx.doi.org/10.1109/ritapp.2019.8932886.

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Zewge, Natnael S., Youngmin Kim, Jintae Kim et Jong-Hwan Kim. « Millimeter-Wave Radar and RGB-D Camera Sensor Fusion for Real-Time People Detection and Tracking ». Dans 2019 7th International Conference on Robot Intelligence Technology and Applications (RiTA). IEEE, 2019. http://dx.doi.org/10.1109/ritapp.2019.8932892.

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Casarini, Luiz Miguel, Monica Doll Costa, Julia Alves Costa et Jose Edmilson A. Mello. « Sidescan sonar and towed camera : A combined system of low-cost mapping for shallow water ». Dans 2015 IEEE/OES Acoustics in Underwater Geosciences Symposium (RIO Acoustics). IEEE, 2015. http://dx.doi.org/10.1109/rioacoustics.2015.7473587.

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Webb, Timothy J., Mark L. Kiefer, Raymond Gignac et Stuart A. Baker. « Evaluation of a gamma camera system for the RITS-6 accelerator using the self-magnetic pinch diode ». Dans SPIE Optical Engineering + Applications, sous la direction de Gary P. Grim et H. Bradford Barber. SPIE, 2015. http://dx.doi.org/10.1117/12.2186628.

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Pérez Portero, Adrián, Lara Pilar Fernandez Capon, Marc Badia Ballús, P. Fabregat, L. Rayon, Amadeu Gonga Siles, Ieremia Crisan et al. « RITA : a 1U multi-sensor Earth observation payload for the AlainSat-1 ». Dans Symposium on Space Educational Activities (SSAE). Universitat Politècnica de Catalunya, 2022. http://dx.doi.org/10.5821/conference-9788419184405.077.

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The Remote sensing and Interference detector with radiomeTry and vegetation Analysis (RITA) is one of the Remote Sensing payloads selected as winners of the 2nd GRSS Student Grand Challenge in 2019, to fly on board of the 3U AlainSat-1. This CubeSat is being developed by the National Space Science and Technology Center (NSSTC), United Arab Emirates University. RITA has been designed as an academic mission, which brings together students from different backgrounds in a joint effort to apply very distinct sensors in an Earth Observation mission, fusing their results to obtain higher-accuracy measurements. The main payload used in RITA is a Total Power Radiometer such as the one on board the FSSCat mission. With these radiometric measurements, soil moisture and ice thickness will be obtained. To better characterize the extensive Radio-Frequency Interferences received by EO satellites in protected bands, several RFI Detection and Classification algorithms will be included to generate a worldwide map of RFI. As a novel addition to the 3Cat family of satellites and payloads, a hyper-spectral camera with 25 bands ranging from 600 to 975 nm will be used to obtain several indexes related to vegetation. By linking these measurements with the soil moisture obtained from the MWR, pixel downscaling can be attempted. Finally, a custom- developed LoRa transceiver will be included to provide a multi-level approach to in-situ sensors: On-demand executions of the other payloads will be able to be triggered from ground sensors if necessary, as well as simple reception of other measurements that will complement the ones obtained on the satellite. The antennas for both the MWR and the LoRa experiments have been developed in-house, and will span the entirety of one of the 3U sides of the satellite. In this work, the latest development advances will be presented, together with an updated system overview and information about the operations that will be conducted. Results obtained from the test campaign are also presented in the conference.

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Parshley, Stephen C., German Cortes-Medellin, Amit Vishwas, Donald B. Campbell et Terry Herter. « Cryo-Mechanical Design of ALPACA : A Mixed-Material Radio-Frequency Transparent Vacuum Vessel Operating at 20 K ». Dans ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21818.

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Abstract One of the most promising technologies to enable and enhance large survey capabilities for radio astronomy is the use of focal plane phased array antenna feeds, or more simply, phased array feeds (PAFs). PAFs allow for full and continuous coverage of the telescope’s field of view (FoV), and combined with cryogenic amplifiers, can result in survey speed improvements several orders of magnitude better than current multiple-feed-horn cameras. In order to locate cryogenic PAF elements and amplifiers at the telescope focal plane, a radio-frequency transparent vacuum vessel is required. Unlike typical radomes, the transmission properties must be exceptionally good when dealing with weak astronomical signals. The dome must also be sufficiently strong to carry the mechanical load on the vacuum vessel due to atmospheric pressure. Furthermore, the thermal loading on the internal cryogenic stages from the dome must be manageable for the cooling system. We have solved these problems by using a combination of welded polyethylene sheet to maintain the vacuum integrity and a closed-cell rigid foam to transfer the mechanical load to the opposite side of the vessel (a welded aluminum structure). The PAF elements and amplifiers operate at 20 K, while the foam transfers the mechanical load through an 80 K temperature stage, which also serves as a low-temperature radiation shield for the 20 K sections. The poor thermal conductivity of the foam, combined with G10-CR thermal standoffs on the opposite side, ensures the 80 K stage is sufficiently thermally isolated from room temperature conduction. The radiative loading is reduced via the usual employment of multi-layer insulation. In order to facilitate instrument maintenance and future upgrades, a modular PAF element mechanical strategy is employed. The design is such that a PAF-element-amplifier unit can be replaced without accessing the 20 K stage owing to the use of a “cryo-clamp” that uses materials with different coefficients of thermal expansion to tightly hold the units when cold. Cooling is supplied by three two-stage Gifford-McMahon cryo-coolers. This paper presents these design details for the cryostat of the ALPACA (Advanced L-Band Phased Array Camera for Arecibo), an instrument currently being designed and built for the 305 m radio telescope of the Arecibo Observatory in Puerto Rico.

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Holguin, Ryan, John Bernardin et Robert Morgan. « Experimental Methods for Studying and Characterizing Freely Expanding Supersonic Gaseous Jets ». Dans ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-5104.

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Abstract This manuscript describes an experimental system that was constructed to observe and scrutinize the transient fluid mechanics of a supersonic gaseous jet freely expanding into ambient air conditions within a steel containment vessel. Measurement parameters included jet expansion angle, peak jet velocity and local velocity profile, shock propagation, vessel gas entrainment, and wall stagnation pressure. Test gases included air and helium at pressure ratios ranging from roughly 2 to 300. The measurement techniques used to characterize the gas jets included hot wire anemometry, high-frequency pressure transducer measurements, and schlieren/shadowgraph imagery. The development of a system capable of capturing the desired data presented many engineering challenges including optical alignment for schlieren imaging, synchronizing the system for consistent and repeatable data collection, development of an experimental vessel capable of incorporating measurement equipment, and accommodation for future measurement capabilities. A vented PVC cylindrical test vessel was utilized in the preliminary stages of experimentation and set up of the gas delivery and diagnostic systems. Upon completion of the preliminary testing, a stainless steel experimental vacuum and pressure vessel, capable of accommodating a variety of diagnostics, was designed and fabricated. The gas jet delivery system consisted of a restrictive flow orifice, high pressure two stage regulator, two isolation valves, and a high pressure relief valve set to 4500 psig. Downstream from the safety manifold was a high pressure AC solenoid. This configuration was able to generate a maximum supply pressure of 4000 psig, corresponding to a maximum gas pressure ratio of 400 for a vessel at atmospheric pressure and 4,000 for vessel under low vacuum. The schlieren/shadowgraph configuration utilized for the imaging is a Z-Type configuration and possesses the advantages of both reducing aliasing effects and decreasing the overall area needed for the schlieren arrangement. Schlieren images taken were captured with a PCO Pixelfly CCD camera. A Photron high speed camera eventually replaced the Pixelfly within the schlieren arrangement expanding the imaging capabilities. A large polycarbonate enclosure was developed to enclose the entire system, shielding both the worker and the optics. Pressure and velocity sensors with high frequency response capability were selected to adequately monitor rapidly changing jet characteristics. PCB Piezotronic pressure sensors were mounted flush to the wall of the vessel opposite the gas jet inlet. A TSI one dimensional hot wire probe was inserted radially along the horizontal axis of the vessel, perpendicular to the jet flow. A NI Compact RIO data acquisition system, run with LabVIEW, was used to record the pressure measurements. For the hot wire anemometry velocity measurements, a standalone TSI IFA 300 was used to capture and process data. A dimensional analysis was performed to define the jet velocity in terms of other jet parameters, characteristic lengths, and fluid properties. The dimensional analysis results did not elucidate the substantiality of the dimensionless groupings; however, some of the missing exponents can theoretically be parameterized through additional future testing. Initial measurements with the experimental system will be presented and discussed. Schlieren and shadowgraph images and velocity measurements of air and helium jets were captured in both the PVC and steel vessel configurations. Pressure ratios of 10 to 300 were examined for helium, while pressure ratios up to 20 were achieved for air. The data shows how the leading edge velocity, average spread angle, and Mach disk height data are all influenced by pressure ratio and gas type. Velocity frequency content, basic jet turbulence structure, and gas entrainment are also evident in the experimental data. Based on these initial measurements, an outline for ongoing experimental studies will be presented.

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