SURAT PENCATATAN CIPTAAN Karya Rekaman: Inovasi Pengajaran Gerak Dasar Tari Bali Dengan Bahasa Inggris Dalam Upaya Memperkokoh Kiprah ISI Denpasar di Dunia Internasional

Spatial joins are join operations that involve spatial data types and operators. Spatial access methods are often used to speed up the computation of spatial joins. This paper addresses the issue of benchmarking spatial join operations. For this purpose, we first present a WWW-based benchmark generator to produce sets of rectangles. Using a Web browser, experimenters can specify the number of rectangles in a sample, as well as the statistical distributions of their sizes, shapes, and locations. Second, using the generator and a well-defined set of statistical models we define several tests to compare the performance of three spatial join algorithms: nested loop, scan-and-index, and synchronized tree traversal. We also added a real-life data set from the Sequoia 2000 storage benchmark. Our results show that the relative performance of the different techniques mainly depends on two parameters: sample size, and selectivity of the join predicate. All of the statistical models and algorithms are available on the Web, which allows for easy verification and modification of our experiments.Peer Reviewe

FIREBall-2: advancing TRL while doing proof-of-concept astrophysics on a suborbital platform

Here we discuss advances in UV technology over the last decade, with an emphasis on photon counting, low noise, high efficiency detectors in sub-orbital programs. We focus on the use of innovative UV detectors in a NASA astrophysics balloon telescope, FIREBall-2, which successfully flew in the Fall of 2018. The FIREBall-2 telescope is designed to make observations of distant galaxies to understand more about how they evolve by looking for diffuse hydrogen in the galactic halo. The payload utilizes a 1.0-meter class telescope with an ultraviolet multi-object spectrograph and is a joint collaboration between Caltech, JPL, LAM, CNES, Columbia, the University of Arizona, and NASA. The improved detector technology that was tested on FIREBall-2 can be applied to any UV mission. We discuss the results of the flight and detector performance. We will also discuss the utility of sub-orbital platforms (both balloon payloads and rockets) for testing new technologies and proof-of-concept scientific ideasComment: Submitted to the Proceedings of SPIE, Defense + Commercial Sensing (SI19

FIREBall-2: flight preparation of a proven balloon payload to image the intermediate redshift circumgalactic medium

FIREBall-2 is a stratospheric balloon-borne 1-m telescope coupled to a UV multi-object slit spectrograph designed to map the faint UV emission surrounding z~0.7 galaxies and quasars through their Lyman-alpha line emission. This spectro-imager had its first launch on September 22nd 2018 out of Ft. Sumner, NM, USA. Because the balloon was punctured, the flight was abruptly interrupted. Instead of the nominal 8 hours above 32 km altitude, the instrument could only perform science acquisition for 45 minutes at this altitude. In addition, the shape of the deflated balloon, combined with a full Moon, revealed a severe off-axis scattered light path, directly into the UV science detector and about 100 times larger than expected. In preparation for the next flight, and in addition to describing FIREBall-2's upgrade, this paper discusses the exposure time calculator (ETC) that has been designed to analyze the instrument's optimal performance (explore the instrument's limitations and subtle trade-offs)

FIREBall-2: The Faint Intergalactic Medium Redshifted Emission Balloon Telescope

The Faint Intergalactic Medium Redshifted Emission Balloon (FIREBall) is a mission designed to observe faint emission from the circumgalactic medium of moderate redshift (z~0.7) galaxies for the first time. FIREBall observes a component of galaxies that plays a key role in how galaxies form and evolve, likely contains a significant amount of baryons, and has only recently been observed at higher redshifts in the visible. Here we report on the 2018 flight of the FIREBall-2 Balloon telescope, which occurred on September 22nd, 2018 from Fort Sumner, New Mexico. The flight was the culmination of a complete redesign of the spectrograph from the original FIREBall fiber-fed IFU to a wide-field multi-object spectrograph. The flight was terminated early due to a hole in the balloon, and our original science objectives were not achieved. The overall sensitivity of the instrument and telescope was 90,000 LU, due primarily to increased noise from stray light. We discuss the design of the FIREBall-2 spectrograph, modifications from the original FIREBall payload, and provide an overview of the performance of all systems. We were able to successfully flight test a new pointing control system, a UV-optimized, delta-doped and coated EMCCD, and an aspheric grating. The FIREBall-2 team is rebuilding the payload for another flight attempt in the Fall of 2021, delayed from 2020 due to COVID-19.Comment: 23 Pages, 14 Figures, Accepted for Publication in Ap

Tackling the issue of image processing via plugins: the example of pyds9plugin: ADASS 2021

While several FITS viewer applications improve the way we visualize astronomical data (DS9, Glue, Gaia, etc.), the development of image processing applications remains extremely limited, even though this is just as necessary. Given the diversity of scientific needs, it is essential to tackle efficiently the issue of image processing by gathering contributions from diverse fields of the astronomy community. This community mostly uses popular scientific programming tools such as the Python+Astropy ecosystem. Therefore, Python plugins for existing FITS viewers represent a very interesting way to take up the challenge of developing image processing tools and address the related difficulties. pyds9plugin, a Python DS9 extension for quick-look processing of astronomical images, is designed to do so. This highly interactive extension provides tens of image treatments and analysis that can be generalized automatically to a set of images to turn the plugin into a multiprocessing pipeline. Its design can be easily combined with user-written scripts to allow scientists to add their own Python macros, fitting functions, etc. This article describes the plugin implementation philosophy as well as the main software features. The plugin is available both on Pypi and GitHub, and full documentation including videos is available on pyds9plugin website

CLAUDS, FIREBall : a UV driven approach to understand what is darkening the shiny destiny of galaxies

L'évolution des galaxies est un sujet vivement débattu mettant en jeu des mécanismes physiques complexes intervenant à de multiples échelles. Toutefois quelques consensus ont émergé ces dernières décennies. Parmi eux, le fait que l'univers ait atteint son pic d’activité de formation d'étoiles il y a 10 milliards d'années et que son activité stellaire ne cesse de décliner depuis. Les observations multi-longueur d’ondes de l’ultra violet (UV) à l’infrarouge lointain convergent vers une diminution d'un facteur dix depuis z~2. Le but de cette thèse est d'exploiter le relevé UV CLAUDS pour analyser cette période de déclin de la formation stellaire. En proposant une calibration réaliste de l’atténuation de l’UV par la poussière, nous accédons aux plus profondes fonctions de taux de formation d’étoile corrigées de l’extinction jusqu’à z~2. Malheureusement les phénomènes de gaz régulant la formation d'étoile (accrétion, outflows) étant invisibles pour ce type de relevés, l'observation de ces phénomènes nécessite des instruments de nouvelle génération. La deuxième partie de cette thèse portera sur l'étude, via l’instrument UV FIREBall, de l'environnement des galaxies (milieu circum galactique), considéré comme le lieu de prédilection pour les échanges gazeux et énergétiques entre les galaxies et le MIG. Le spectrographe multi-objets FIREBall, a pour but d'imager l'émission Lyman alpha autour des galaxies, et d’ouvrir la voie pour de nouveaux instruments spatiaux UV. Je présenterai donc ma participation au développement de cet instrument (calibration, évaluation des performances) ainsi que l'analyse des résultats du dernier vol effectué en septembre 2018Galaxy evolution is a complex and heavily debated field as it involves mechanisms arising from a complex interplay between internal and external processes, driven by gravity at large scales and baryonic physics at small scales. However, a few consensuses have emerged in recent decades. Among them, the fact that the Universe reached its peak of star formation activity 10 billion years ago and that its stellar activity has been declining ever since. Multi-wavelength observations from ultraviolet (UV) to far-infrared converge towards a decrease of a factor of ten since z~2. This study aims to exploit the CLAUDS UV survey to analyze this period of star formation decline. By proposing a realistic dust attenuation calibration, we obtain the total star formation of each galaxy and thus estimate the cosmic star formation density evolution for different types of galaxies as the Universe evolves. Unfortunately, since gas phenomena regulating star formation (accretion, outflows) are still invisible for these surveys, understanding star formation decline will be extremely challenging without observing the underlying mechanisms with future instruments generations. Consequently, the second part of this thesis focuses on studying the environment of galaxies (circumgalactic medium), which encompasses all exchanges between galaxies and their surroundings. The pathfinder FIREBall-2, a multi-object UV spectrograph aiming at imaging the gas emission around galaxies and pave the way to orbital UV project, had its first flight in 2018. I will present my contribution to the development of this instrument (calibration, performance evaluation) as well as the analysis of the 2018 flight's dat

Editorial

Herbert Vincent, Picouet Patrick. Editorial. In: Hommes et Terres du Nord, 2002/2. Détroits, sous la direction de Gérard Beltrando. pp. 1-2

Editorial

Herbert Vincent, Picouet Patrick. Editorial. In: Hommes et Terres du Nord, 2002/2. Détroits, sous la direction de Gérard Beltrando. pp. 1-2