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Resumo Este trabalho apresenta o procedimento para realizar a calibração de um modelo climático do ENVI-met, com suas etapas metodológicas, para a avaliação de espaços urbanos abertos de porções da cidade de São Paulo na condição deum dia quente e seco, marcado por altas temperaturas e incidência solar, baixa umidade e baixa nebulosidade. O process...
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Imaging through diffusers presents a challenging problem with various digital image reconstruction solutions demonstrated to date using computers. Here, we present a computer-free, all-optical image reconstruction method to see through random diffusers at the speed of light. Using deep learning, a set of transmissive diffractive surfaces are traine...
Research
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Journal devoted to current developments in astronomy
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Perkiraan Gerhana Matahari dalam perspektif perhitungan astronomi bola. Astronomi Bola yang digunakan merupakan algoritma perhitungan Spherical Astronomy W.M. Smart.
Article
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The history of Compton cameras began with the detection of radiation sources originally for applications in astronomy. A Compton camera is a promising γ-ray detector that operates in the wide energy range of a few tens of keV to MeV. The γ-ray detection method of a Compton camera is based on Compton scattering kinematics, which is used to determine...
Article
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International efforts are underway to explore the Moon's south polar region with robotic and human missions. These missions will address key scientific and exploration objectives in a region rich with possibilities, designed to develop a sustained lunar presence. To assist a trade study among six potential landing sites identified for Artemis astro...
Preprint
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The purely gravitational evidence supporting the need for dark matter (DM) particles is compelling and based on Galactic to cosmological scale observations. Thus far, the promising WIMP scenarios particles have eluded detection, motivating alternative models for DM. We consider the scenarios involving the super-heavy dark matter (SHDM) that potenti...
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The anomalous heating of the solar upper atmosphere is one of the eight key problems in modern astronomy. Moreover, the stratification of the solar atmosphere is an outstanding key-problem in solar physics. In this study, a hot butterfly-like pattern is found to run through the chromosphere to the corona lying right on top of the magnetic butterfly...
Article
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SuperSpec is an integrated, on-chip spectrometer for millimeter and sub-millimeter astronomy intended to pave the way for large-scale, multi-beam spectrometer instruments. SuperSpec is demonstrating a three beam, dual-polarization instrument for observing star formation in distant galaxies on the Large Millimeter Telescope , a 50 m telescope on Vol...
Research
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The N-body problem is the problem that was first posed by Isaac Newton in the 17th century that serves to describe the motion and trajectories of N-point particles. In particular, the three-body problem is especially important in an astronomy context to analyze the stability of orbits for combinations of three planetary bodies. In the project, we w...
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India has a rich scientific heritage. Scientific research in astronomy, medicine, mathematics, and material science has been carried out since ancient times. India is advancing technologically, and the need to disseminate scientific information to the non-scientific community is growing rapidly day-by-day. Over the last few years, India has experie...
Article
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Neste trabalho é apresentada uma proposta de atividade que utiliza uma simulação e um experimento lúdico, como forma de transposição didática, para o ensino do movimento retrógrado aparente de Marte. A simulação desse movimento foi realizada com o software livre Stellarium. Por sua vez, o experimento utilizou dois fidget spinners acoplados de manei...
Article
Full-text available
The anomalous heating of the solar upper atmosphere is one of the eight key problems in modern astronomy. Moreover, the stratification of the solar atmosphere is an outstanding key-problem in solar physics. In this study, a hot butterfly-like pattern is found to run through the chromosphere to the corona lying right on top of the magnetic butterfly...
Preprint
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We present an experiment set to address a standard specification aiming at avoiding local turbulence inside the Coud\'e train of telescopes. Namely, every optical surface should be kept within a 1.5$^\circ$ range around ambient temperature. Such a specification represents an important concern and constraint when developing optical systems for astro...
Presentation
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Esta presentación del OAM de la U.N. de Colombia, para el Contexto de Astronomía de 2016, se elabora con motivo de los 100 años de la Teoría de la Relatividad General, uno de los pilares de la física moderna soportado en los principios que conectan la dinámica y la materia, con la métrica del espacio-tiempo. El homenajeado Albert Einstein, su cread...
Poster
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After approximately half a century of development, HgCdTe infrared detectors have become the first choice for high performance infrared detectors, which are widely used in various industry sectors, including astronomy, military reconnaissance, infrared guidance, infrared warning, weather forecasting, and resource detection. The sensitive and fast r...
Preprint
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Neural fields model signals by mapping coordinate inputs to sampled values. They are becoming an increasingly important backbone architecture across many fields from vision and graphics to biology and astronomy. In this paper, we explore the differences between common conditioning mechanisms within these networks, an essential ingredient in shiftin...
Article
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Sangam literature is one of the oldest pieces of literature that deals with the culture and customs of ancient peoples. In this literature, Ettuthokai (the Eight Anthologies) and Patthupaattu (The Ten Idylls) are the best guides for us to understand the aspects of the lives of the people and to live through them, and they provide ideas in many fiel...
Book
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This book entitled ‘Recent Development and Techniques in Physical Sciences’ is presented as a guideline to help researchers to get acquainted with the new inventions and theories in the field of Physical Sciences. Physical Science is a collective term for areas of study which includes Physics, Chemistry, Computer Science, Mathematics, Statistics, M...
Article
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Particle detection has been increasingly applied over a wide range of disciplines, including high-energy physics, astroparticles, space science and astronomy, biological sciences, medical imaging, remote sensing, environmental monitoring, cultural heritage, and homeland security [...]
Preprint
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The last two decades have seen a major expansion in the availability, size, and precision of time-domain datasets in astronomy. Owing to their unique combination of flexibility, mathematical simplicity and comparative robustness, Gaussian Processes (GPs) have emerged recently as the solution of choice to model stochastic signals in such datasets. I...
Article
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Taking Big Data research as a case study, this article intends to investigate the cognitive relatedness of research topics across the global science landscape to a focal topic. Several levels of cognitive relatedness are established depending on the citation distance between the citing publications and a core set of publications. The concept of cit...
Article
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View the article online for updates and enhancements. You may also like Simple proof of confidentiality for private quantum channels in noisy environments A Pirker, M Zwerger, V Dunjko et al.-Anonymity communication VPN and Tor: a comparative study E Ramadhani-Abstract. Images are considered as important data used in many fields such as military op...
Poster
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For more than 20 years, professional astronomers J. A. Caballero and M. Sundin have talked about astronomy on different national radio stations in Spain [1] and Sweden [2] aiming to reach a wide audience. In this publication we address the problem that we face when trying to reach more people than those already interested in astronomy or science. O...
Conference Paper
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It is well documented that there is little diversity within physics at the undergraduate level in the United States, and this problem is amplified in graduate school and the workforce. The cause of this underrepresentation of women and people of color in physics is reported to be partially due to a "cold" and unwelcoming climate within physics depa...
Preprint
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In observational astronomy, noise obscures signals of interest. Large-scale astronomical surveys are growing in size and complexity, which will produce more data and increase the workload of data processing. Developing automated tools, such as convolutional neural networks (CNN), for denoising has become a promising area of research. We investigate...
Article
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We performed a unique Venus observation campaign to measure the disk brightness of Venus over a broad range of wavelengths in 2020 August and September. The primary goal of the campaign was to investigate the absorption properties of the unknown absorber in the clouds. The secondary goal was to extract a disk mean SO 2 gas abundance, whose absorpti...
Article
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Direct detection of gravitational waves (GWs) on 17 August 2017, propagating from a binary neutron star merger, or a “kilonova”, opened the era of multimessenger astronomy. The ejected material from neutron star mergers, or “kilonova”, is a good candidate for optical and near infrared follow-up observations after the detection of GWs. The kilonova...
Preprint
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The Cherenkov Telescope Array Observatory (CTAO) will be the largest and most advanced ground-based facility for gamma-ray astronomy. Several dozens of telescopes will be operated at both the Northern and Southern Hemisphere. With the advent of multi-messenger astronomy, many new large science infrastructures will start science operations and targe...
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Metaphors enable the understanding of one thing in terms of another. Although central for reasoning and theorizing, there is limited understanding about their role in theory development. This paper presents a process of metaphorical reasoning that addresses the question of how metaphors support theory development. The process is applied on the case...
Article
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Image subtraction is essential for transient detection in time-domain astronomy. The point-spread function (PSF), photometric scaling, and sky background generally vary with time and across the field of view for imaging data taken with ground-based optical telescopes. Image subtraction algorithms need to match these variations for the detection of...
Article
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The past decade has brought impressive advances in the astrophysics of cosmic rays (CRs) and multiwavelength astronomy, thanks to the new instrumentation launched into space and built on the ground. Modern technologies employed by those instruments provide measurements with unmatched precision, enabling searches for subtle signatures of dark matter...
Article
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According to Bharathi's educational ideas, everyone can get an equal status in society through education. He lays down the curriculum to include basic writing, mathematics, history, geography, astronomy, religious-based education, economic education, inquiry-based science, political science, handcraft industry, agriculture, business, physical educa...
Preprint
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Online bibliographic databases have enabled new research through which bibliographic records are analyzed as data about science. Within these records, the acknowledgements sections of papers are often used to draw conclusions about funding support for published research. While acknowledgements and funding statements can be informative for research...
Preprint
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This paper presents results of a survey of authors of journal articles published over several decades in astronomy. The study focuses on determining the characteristics and accessibility of data behind papers, referring to the spectrum of raw and derived data that would be needed to validate the results of a particular published article as a capsul...
Article
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We present a study of scintillation induced by the mid-latitude ionosphere. By implementing methods currently used in Interplanetary Scintillation studies to measure amplitude scintillation at low frequencies, we have proven it is possible to use the Murchison Widefield Array to study ionospheric scintillation in the weak regime, which is sensitive...
Article
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In many cases, we have few optical observations over a short time span, and most of the information generated is too limited to compute a full orbit according to the angles-only method. This study aims to develop a mathematical model to determine the precise orbit from the optical observation data by the least squares method. We have used a set of...
Preprint
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We perform general relativistic simulations of self-gravitating black hole-disks in which the spin of the black hole is significantly tilted ($45^\circ$ and $90^\circ$) with respect to the angular momentum of the disk and the disk-to-black hole mass ratio is $16\%-28\%$. The black holes are rapidly spinning with dimensionless spins up to $\sim 0.97...
Preprint
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The Cal-Bridge program connects promising juniors and seniors from underrepresented groups with STEM faculty mentors to help smooth the transition from undergraduate to graduate programs.
Preprint
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The lack of diversity in physics and astronomy PhD programmes is well known but has not improved despite decades of efforts. PhD bridge programmes provide an asset-based model to help overcome the societal and disciplinary obstacles to improving access and inclusion for students from underrepresented groups and are beginning to show some success. W...
Article
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Maunakea is one of the world's primary sites for astronomical observing, with multiple telescopes operating over submillimeter to optical wavelengths. With its summit higher than 4200 m above sea level, Maunakea is an ideal location for astronomy, with a historically dry, stable climate and minimal turbulence above the summit. Under a changing clim...
Article
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Massive binaries play an important role in fields ranging from gravitational-wave astronomy to stellar evolution. We provide several lines of evidence that classical OBe stars in the Small Magellanic Cloud (SMC) obtain their rapid rotation from mass and angular momentum transfer in massive binaries, which predicts that the subsequent supernovae sho...
Article
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Modern machine learning techniques have become indispensable in many fields of astronomy and astrophysics. Here we introduce a specific class of methods, invertible neural networks, and discuss two specific applications, the prediction of stellar parameters from photometric observations and the study of stellar feedback processes from on emission l...
Article
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Zusammenfassung Der Almagest, das astronomische Hauptwerk des Klaudios Ptolemaios, arbeitet mit teilweise komplexen Bewegungsmodellen für die sieben Himmelskörper, die keine Fixsterne sind. Zwei davon, nämlich die Modelle für Sonne und Mond, können als Paradigmen angesehen werden. Sie werden hier detailliert behandelt, wobei die Bestimmung der Para...
Article
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The ability to discover new transient candidates via image differencing without direct human intervention is an important task in observational astronomy. For these kind of image classification problems, machine learning techniques such as Convolutional Neural Networks (CNNs) have shown remarkable success. In this work, we present the results of an...
Preprint
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Intensity-interferometry based on Hanbury-Brown and Twiss's seminal experiment for determining the radius of the star Sirius formed the basis for developing the quantum theory of light. To date, the principle of this experiment is used in various forms across different fields of quantum optics, imaging and astronomy. Though, the technique is powerf...
Preprint
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For many students, introductory college science courses are often the only opportunity in their formal higher education to be exposed to science, shaping their view of the subject, their scientific literacy, and their attitudes towards their own ability in STEM. While science writing instruction has been demonstrated to impact attitudes and outlook...
Book
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The general theory of relativity has allowed a better understanding of the structure of the universe. One of the fundamental problems in the general relativity is finding exact solutions of the Einstein field equations. Some solutions found fundamental applications ins astrophysics, cosmology and more recently in the developments inspired by string...
Article
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is research aims to provide a general visualization of studies focused on the intellectual capital developed in Colombia. Firstly, detailed information on research articles on this topic was obtained from the Scopus database. Secondly, the information was analyzed using Excel through the direct comparison and analysis of graphs with references and...
Preprint
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Rosetta is a science platform for resource-intensive, interactive data analysis which runs user tasks as software containers. It is built on top of a novel architecture based on framing user tasks as microservices - independent and self-contained units - which allows to fully support custom and user-defined software packages, libraries and environm...
Conference Paper
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Humans are always fascinated about what's beyond this globe, what makes up the outer space? Can we live on another planet? To find solution to these questions many space missions were launched but the most successful of them all is Kepler Space Telescope mission, for years, scientists have used data from NASA's Kepler Space Telescope to look for an...
Article
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Dark matter is the most and unsolved puzzle in today's Astrophysics, Cosmology, area Astronomy. Science has classified matter in two different states as visible matter (Baryonic) that we see around and invisible (dark) matter not seen to Human eyes. Researchers are in search of dark matter in this world elsewhere .According to theories proposed, da...
Conference Paper
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Stratospheric balloons offer cost-effective platforms for optical payloads in the context of astronomy missions. During the 2018 flight of the Faint Intergalactic medium Redshifted Emission Balloon (FIREBall) experiment, the moon light was scattered from the surface of the balloon and redirected into the telescope which resulted in degraded optical...
Article
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Review of the book : Hellenistic Astronomy , The Science in its Context, edd Alan Bowen and Francesca Rochberg, Brill, 2020
Article
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Spectrum technologies are shaping the way our world connects, communicates, and functions. Radio nodes connect through a nearly ubiquitous wireless mesh of other nodes, access points, satellites, and base stations to support an ever-expanding panorama of applications, spanning communication, autonomous navigation and transportation, radar-based geo...
Article
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Since 1960, when the first hydrogen frequency standard, the microwave amplification by stimulated emission of radiation (maser), was developed in the laboratory of Norman Ramsey at Harvard University, the performance of its frequency stability and technique development have been closely related to scientific research. A variety of H-maser designs h...
Article
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Hosting a ∼1.5 bar N2 atmosphere and reducing atmospheric composition, Titan has the energy sources needed to drive disequilibrium chemistry and hosts an aerosol layer which shields the surface from incident UV radiation. This world draws parallels to an early Earth-like world (although ∼200 K cooler), and the atmospheric chemistry may be capable o...
Article
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The paper brings into light and discusses a concentric solar model briefly described in Chapter 5 of Section III of ‘Abd al-Raḥmān al-Khāzinī’s On experimental astronomy, a treatise embedded in the prolegomenon of his comprehensive Mu‘tabar zīj, completed about 1121 c.e. In it, the Sun is assumed to rotate on the circumference of a circle concentri...
Article
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This paper investigates the solutions (if any) of the Diophantine equation 3x + 35y = Z2, where , x, y, and z are whole numbers. Diophantine equations are drawing the attention of researchers in diversified fields over the years. These are equations that have more unknowns than a number of equations. Diophantine equations are found in cryptography,...
Article
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Atopic diseases, including atopic dermatitis (AD) and asthma, affect a large proportion of the population, with increasing prevalence worldwide. AD often precedes the development of asthma, known as the atopic march. Allergen sensitization developed through the barrier-defective skin of AD has been recognized to be a critical step leading to asthma...
Article
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A bstract In this work we study the high-energy Higgs boson phenomenology associated to the non-metricity scale Λ Q at the LHC. Non-metricity is present in more generic non-Riemannian geometries describing gravity beyond General Relativity and exhibits nice features in astronomy and cosmology, and it can be analysed perturbatively. Using effective...
Article
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It has become commonplace in astronomy to describe the transverse coarse structure of jets in loosely defined terms such as “sheath” and “spine” based on discussions of parsec scale properties. But, the applicability, dimension, and prominence of these features on sub-light-year scales has previously been unconstrained by observation. The first dir...
Article
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Applications in diverse domains such as astronomy, economics and industrial monitoring, increasingly press the need for analyzing massive collections of time series data. The sheer size of the latter hinders our ability to efficiently store them and also yields significant storage costs. Applying general purpose compression algorithms would effecti...
Book
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Wie kommt der Zufall in unsere Welt? Und warum ist so vieles nicht vorhersehbar? Verständlich, spannend und amüsant erzählend entführt uns der Autor in die Welt der Chemie, Quantenphysik und Biologie. Die Astronomie und Philosophie streifend, werden wir Zeugen einer lohnenden Entdeckungsreise. Dabei entwickelt er auf der Basis der Naturgesetze ei...
Article
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Astronomy subjects and concepts have always been a fascinating subject at the center of children’s attention. As a result, it is critical to reveal pre-school teachers' experiences in astronomy education, to determine how they design activities and carry them out, to determine whether they see themselves as sufficient/incompetent, and to determine...