547 research outputs found
Stratospheric Ballooning With SPIDER and BIT
No full textStratospheric ballooning is an important platform for astrophysics and cosmology. This work presents the development of Spider, a CMB polarimeter, and BIT, a visible light and near-UV imager, both of which are balloon experiments. Both experiments require gondolas and pointing systems to track or scan on the sky, and their development is an important area of research in the field.
Spider aims to observe the relics of inflation by constraining the tensor to scalar ratio, r. It flew an initial flight in 2014-15 and the data analysis is presented here. This work includes the development of the Spider noise model which is an important component of any CMB analysis. Development work on the second Spider gondola is also presented, preparing it for a second Antarctic campaign in the near future.
BIT is attempting to constrain Ω_m , the energy density of matter and σ_8 , the scale size of early universe fluctuations, through the use of weak lensing. Although no weak lensing data has been obtained yet, this thesis presents the development of the instrument from its earliest stages through its two successful test flights. Specific emphasis is given to the development of the star camera subsystem, which was integral to the success of the project.Ph.D.2020-07-21 00:00:0
A Study of characterization and representation in James Joyce's a portrait of the artist as a young man and John barth's lost, in the funhouse
Get PDFDissetação (mestrado) - Universidade Federal de Santa Catarina, Centro de Comunicação e ExpressãoAnálise da caracterização e da representação do artista nos romances A Portrait of the Artist as a Young Man de James Joyce e Lost in the Funhouse de John Barth. A análise destes romances quanto às diferenças existentes no modo de representação do artista, faz com que eles possam ser lidos, respectivamente, como representantes das narrativas modernista e pós-modernista
Observing Exoplanets in the Near-Infrared from a High Altitude Balloon Platform
No full textAlthough there exists a large sample of known exoplanets, little data exists that can be used to study their global atmospheric properties. This deficiency can be addressed by performing phase-resolved spectroscopy - continuous spectroscopic observations of a planet's entire orbit about its host star - of transiting exoplanets. Planets with characteristics suitable for atmospheric characterization have orbits of several days, thus phase curve observations are highly resource intensive, especially for shared use facilities. In this work, we show that an infrared spectrograph operating from a high altitude balloon platform can perform phase-resolved spectroscopy of hot Jupiter-type exoplanets with performance comparable to a space-based telescope. Using the EXoplanet Climate Infrared TElescope (EXCITE) experiment as an example, we quantify the impact of the most important systematic effects that we expect to encounter from a balloon platform. We show an instrument like EXCITE will have the stability and sensitivity to significantly advance our understanding of exoplanet atmospheres. Such an instrument will both complement and serve as a critical bridge between current and future space-based near-infrared spectroscopic instruments
Design and Optimization of a 1.5m Telescope Balloon Borne Gondola
Get PDFGigaBIT is the successor of the Balloon-Borne Imaging Testbed (SuperBIT), a 1.5m telescope that operates in the stratosphere. The GigaBIT gondola must support a telescope almost double the size of SuperBIT while still adhering to the mass restrictionset forth by its predecessor as it will be launched with the same balloon. This presents the challenge of designing a lightweight gondola, strong enough to survive the necessary structural safety requirements and rigid enough to allow for sub-arcsecond
pointing. This thesis explores the design process and development of the gondola. This was done using topological optimization to determine the optimal structural geometry of the gondola’s frames. From there, a design was produced, analyzed and
amended rigorously following static analysis results to adhere to the mandatory design specifications set forth by the Gondola Structural Design Requirements. This design represents a foundation for future balloon-borne astronomy.M.A.S
The ecclesiology of stanley hauerwas: resident aliens and die concrete church
Get PDFThis thesis focuses on Stanley Hauerwas' thought about the church insofar as it represents a concrete ecclesiological approach. I argue first that concrete ecclesiology, while often appearing in the work of its proponents as methodological presuppositions rather than an explicit doctrine of church, is sufficiently distinctive that Hauerwas' ecclesiology can be placed within it. Through exploring Hauerwas' theology in Chapter 1， I suggest that his ecclesiology shares key influences with concrete approaches through Barth, Frei, Wittgenstein and Yale postliberalism. Hauerwas also shares concrete ecclesiology's concerns in terms of its interest in the concrete church as a valuable subject for theological reflection, attention to distinctive Christian practices, theologically therapeutic and pastoral-minded approaches to reflecting on the life of the church, and concern for how the church interacts with the world. In Chapter 2, I evaluate Hauerwas' work by seeing how his ecclesiology deals with the realities of sin, division and confusion within the church. I argue that Hauerwas' rhetoric idealises the practices of the church, so there are limitations to the concreteness of his ecclesiology. Combined with Hauerwas' problematic and overstated use of narrative, this idealisation results in insufficient focus on the provisional and fallible nature of the church's practices, and a deleteriously pugilistic attitude towards the world. In Chapter 3， I explore how Barth balances his ecclesiology by holding its theologically centrifugal elements in tension with the various creedal contexts in which it is set forth. This not only mitigates Hauerwas' criticisms of Earth's ecclesiology, but also proffers ways in which a robust doctrinal setting would maintain the prophetic force of Hauerwas' challenges to the church without allowing Christian practice to bear the weight of realising God's kingdom. I then argue that Christ's resurrection is a helpful doctrinal setting for a methodologically and pastorally wise concrete ecclesiology
In Search of an Imprint of Magnetization in the Balloon-borne Observations of the Polarized Dust Emission from Molecular Clouds
No full textThe observation of the polarization of thermal emission from dust grains is a key method in the study of the role of the magnetic fields in the star formation process. This dissertation introduces BLASTPol, a submillimeter telescope for polarization designed for mapping dust polarization in scales ranging from pre-stellar cores to sections of molecular clouds and the Histogram of Relative Orientations (HRO), a new statistical tool for the analysis of the polarization maps.
The observations of BLASTPol were possible thanks to a novel light-weight carbon fiber sunshield structure and the detailed thermal modeling of the balloon-borne platform. The carbon fiber structure is based on the construction technique developed for the Spider gondola which integrates detailed Finite Element Analysis with the use of composite materials
and adhesive joints. The thermal model uses 3D Computer Assisted Design allowing unprecedented control of the sun avoidance limits and detailed modeling of the gondola components.
BLASTPol made observations of the Lupus I and Vela C molecular clouds, the Carina Nebula, and the Puppis Cloud Complex in two balloon-borne flights over Antarctica in 2010 and 2012. The construction of polarization maps from the BLASTPol10 observations was affected by multiple pathologies in the data. However, the preliminary maps indicate the need of a
statistical tool which allows relating these observations to magnetohydrodynamics (MHD) simulations motivating the development of HRO. Most of the problems in the BLASTPol10 data were successfully addressed in BLASTPol12 and the construction of polarization maps of the observed regions is currently in progress.
The HRO is a statistical tool which assesses the relative orientation between the magnetic field and the density structures. This tool was characterized by using simulated molecular clouds with different magnetization indicating that: 1. There is an imprint of the magnetization level in the relative orientation of the projected magnetic field with respect to the column density structure. 2. This imprint of magnetization can be used to complement the current estimates of magnetic field strength provided by the Chandrasekhar-Fermi method. HRO establishes a direct link with MHD simulations providing a common tool for the analysis of polarization maps from BLASTPol.Ph
"Have you really read Job? Read him, read him again and again" : Kierkegaard, Vischer, and Barth on the book of Job
No full textThis thesis explores the reception history of the book of Job, particularly in Søren
Kierkegaard’s Three Upbuilding Discourses and Repetition, Wilhelm Vischer’s “Hiob, ein
Zeuge Jesu Christi,” and Karl Barth’s Church Dogmatics. It examines the hermeneutical
presuppositions of these three scholars and how the scholars themselves fit into the history
of interpretation, showing that they use a post-critical allegorical interpretation in order to
explore the freedom of God and humanity.
Chapter one offers a defense of using reception history in biblical studies. By
walking through Mikhail Bakhtin’s theories on great time and the chronotope, it argues that
great texts continue to live and grow even after their completion and canonization. During
this “afterlife,” their meaning expands as more readers participate in their interpretations.
Chapter two examines the afterlife of the book of Job in the hands of Christian exegetes,
focusing on allegory and freedom in the interpretations by Gregory the Great, Thomas
Aquinas, Martin Luther, John Calvin, and Immanuel Kant. Chapter three looks at the
unusual and rich interpretations of Job by Kierkegaard—the autonymous upbuilding
discourse on Job’s response to his suffering in the prologue and the novella Repetition as an
interpretation of the dialogue between Job and his friends. Chapter four examines the
interpretation of the book of Job in Vischer’s mini-commentary. Vischer sees the character
of Job as one whose devotion to God goes beyond the laws that God purveys and the
doctrine that seeks to explain God. Referring specifically to the works of Kierkegaard and
Vischer, Karl Barth’s work on Job—the focus of chapter five—sees the book of Job as
illustrative of Jesus Christ’s relationship to God and humanity. All three scholars
incorporated allegory while ruminating on the freedom of God in the book of Job. The final
chapter evaluates their interpretations while addressing their similarities and differences
The EXoplanet Climate Infrared TElescope (EXCITE)
No full textAuthors: Peter C. Nagler, Lee Bernard, Andrea Bocchieri, Nat Butler, Quentin Changeat, Azzurra D'Alessandro, Billy Edwards, John Gamaunt, Qian Gong, John Hartley, Kyle Helson, Logan Jensen, Daniel P. Kelly, Kanchita Klangboonkrong, Annalies Kleyheeg, Nikole K. Lewis, Steven Li, Michael Line, Stephen F. Maher, Ryan McClelland, Laddawan R. Miko, Lorenzo V. Mugnai, C. Barth Netterfield, Vivien Parmentier, Enzo Pascale, Jennifer Patience, Tim Rehm, Javier Romualdez, Subhajit Sarkar, Paul A. Scowen, Gregory S. Tucker, Augustyn Waczynski, Ingo WaldmannSPIE Astronomical Telescopes + Instrumentation, 2022, Montréal,
Québec, CanadaThe EXoplanet Climate Infrared TElescope (EXCITE) is a 0.5 meter near-infrared spectrograph that will fly
from a high altitude balloon platform. EXCITE is designed to perform phase-resolved spectroscopy – continuous
spectroscopic observations of a planet’s entire orbit about its host star – of transiting hot Jupiter-type exoplanets.
With spectral coverage from 0.8 – 4 um, EXCITE will measure the peak of a target’s spectral energy distribution
and the spectral signatures of many hydrogen and carbon-containing molecules. Phase curve observations are
highly resource intensive, especially for shared-use facilities, and they require exceptional photometric stability
that is difficult to achieve, even from space. In this work, we introduce the EXCITE experiment and explain how
it will solve both these problems. We discuss its sensitivity and stability, then provide an update on its current
status as we work toward a 2024 long duration science flight.This work is supported by NASA award 18-APRA18-0075 selected under NASA Research Announcement
NNH18ZDA001N, Research Opportunities in Space Science – 2018 (ROSES-2018), and in part by the NASA
Rhode Island Space Grant. Work by Kyle Helson is supported by NASA under award number 80GSFC17M0002https://www.spiedigitallibrary.org/conference-proceedings-of-spie/12184/121840V/The-EXoplanet-Climate-Infrared-TElescope-EXCITE/10.1117/12.2629373.ful
BFORE: A CMB balloon payload to measure reionization, neutrino mass, and cosmic inflation
No full textBFORE is a high-altitude ultra-long-duration balloon mission to map the cosmic microwave background (CMB). During a 28-day mid-latitude ight launched from Wanaka, New Zealand, the instrument will map half the sky to improve measurements of the optical depth to reionization tau. This will break parameter degeneracies needed to detect neutrino mass. BFORE will also hunt for the gravitational wave B-mode signal, and map Galactic dust foregrounds. The mission will be the first near-space use of TES/mSQUID multichroic detectors (150/217 GHz and 280/353 GHz bands) with low-power readout electronics
Magána hausa. Native literature or proverbs, tales, fables and historical fragments in the Hausa language. To which is added a translation in English.
No full textEnglish translation (195 p.) has special t.-p.: African proverbs, tales and historical fragments.Introductory sentences.--Proverbs.--Letters of Dorŭgu.--The life and travels of Dorŭgu, accompanying the late Dr. Barth in Africa, England, and Germany, as dictated by himself.--Narratives, tales, and descriptions, chiefly by Dorŭgu. Contributions forwarded to the author by the Rev. J. C. John, native minister at Lokojah, river Niger. Contributions forwarded to the author by Mr. G. A. Krause, from Tripoli, in Africa.--English translation.Mode of access: Internet
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