260 research outputs found
Moon-Based Non-Gaussian Multi-Object Tracking for Cislunar Space Domain Awareness
No full textObject tracking in cislunar space has become an area of interest within many communities where cislunar space domain awareness (SDA) is critical to operations. Due to the influence of both the Earth and Moon on objects in this domain, the classical two body problem does not accurately describe the dynamics of the state. Legacy tracking capabilities fall short in providing accurate state estimates due to the large volume of space and the highly non-linear dynamics involved. In order to advance SDA in cislunar space, tracking capabilities must be updated for this domain. Both the Extended Kalman Filter (EKF) and Gaussian Mixture Extended Kalman Filter (GM-EKF) are used for orbit determination in this thesis along side the Circular Restricted Three Body Problem (CR3BP) to model the non-linear dynamics. The filters are utilized to determine the best estimate of the state as well as its covariance. The two filter's performances are compared to highlight areas in which the assumptions surrounding the EKF are violated resulting in failed tracking, as well as to highlight the power of the GM-EKF for non-linear systems using splitting and merging techniques. This thesis presents single and multiple object tracking of objects in a multitude of cislunar orbits using a Moon ground-based sensor. Multiple object tracking is accomplished using a novel Lyapunov-based scheduler in order to reduce the total system uncertainty. The environment is modeled to include exclusion zones which preclude measurements. These zones consist of conjunction from the Earth and Sun, brightness constraints, and camera field of regard (FOR). When measurements are unavailable the uncertainty in the state estimation rises significantly.An investigation of varied sensor placements and Sun-Earth-Moon geometries provides results to inform locations and trends which are able to confidently track both single and multiple objects in cislunar orbits. </p
Boosted dark matter at neutrino experiments
No full textCurrent and future neutrino experiments can be used to discover dark matter, not only in searches for dark matter annihilating to neutrinos, but also in scenarios where dark matter itself scatters off standard model particles in the detector. In this work, we study the sensitivity of different neutrino detectors to a class of models called boosted dark matter, in which a subdominant component of a dark sector acquires a large Lorentz boost today through annihilation of a dominant component in a dark matter-dense region, such as the galactic Center or dwarf spheroidal galaxies. This analysis focuses on the sensitivity of different neutrino detectors, specifically the Cherenkov-based Super-K and the future argon-based DUNE to boosted dark matter that scatters off electrons. We study the dependence of the expected limits on the experimental features, such as energy threshold, volume and exposure in the limit of constant scattering amplitude. We highlight experiment-specific features that enable current and future neutrino experiments to be a powerful tool in finding signatures of boosted dark matter
Brief article about Maine\u27s moon rocks which were received as gifts from the Apo
No full textBrief article about Maine\u27s moon rocks which were received as gifts from the Apollo 11 and Apollo 17 missions and are safely displayed in the Maine State Museum\u27s Cabinet of Curiosities exhibit
Keith Jarrett Trio - Live in Tokyo 1986: An analysis of Jarrett's solo in the composition You and the Night and the Music
No full textPředmětem předkládané bakalářské práce je analýza sóla do písně You and the Night and the Music amerického jazzového klavíristy Keitha Jarretta z koncertu v Hitomi Memorial Hall v Tokiu 26. října roku 1986, kde vystoupil se svým triem. V analýze autor práce sleduje formální a tektonickou výstavbu Jarrettova sóla a prezentuje získané poznatky o interpretově schopnosti vytvářet formálně ucelený tvar o koherentní struktuře v reálném čase v rámci improvizovaného jazzového sóla. Směr analýzy vede autor práce nejprve zevnitř, kdy zkoumá průběh sóla detailně chronologicky takt po taktu a popisuje Jarrettem zahraný hudební materiál, a poté nabízí pohled na Jarrettovo sólo z vnější perspektivy pomocí grafické analýzy.The subject of the presented Bachelor 's thesis is the analysis of a solo in the song You and the Night and the Music by the American jazz pianist Keith Jarrett, as played at a concert at the Hitomi Memorial Hall in Tokyo on October 26, 1986, where Jarrett was performing with his trio. In the analysis, the author is observing the formal and tectonic structure of Jarrett's solo, and then presents the acquired information on the performer's ability to create a formally coherent shape with a coherent structure in real time within the improvised jazz solo. The author leads the direction of the analysis at first from the inside, when he in detail examines the development of the solo chronologically bar by bar and describes the musical material as played by Jarrett, and then he presents a view on Jarrett's solo from an external perspective, using graphical analysis
Michel electron reconstruction using cosmic-ray data from the MicroBooNE LArTPC
No full textThe MicroBooNE liquid argon time projection chamber (LArTPC) has been taking data at Fermilab since 2015 collecting, in addition to neutrino beam, cosmic-ray muons. Results are presented on the reconstruction of Michel electrons produced by the decay at rest of cosmic-ray muons. Michel electrons are abundantly produced in the TPC, and given their well known energy spectrum can be used to study MicroBooNE's detector response to low-energy electrons (electrons with energies up to ∼ 50 MeV). We describe the fully-automated algorithm developed to reconstruct Michel electrons, with which a sample of ∼ 14,000 Michel electron candidates is obtained. Most of this article is dedicated to studying the impact of radiative photons produced by Michel electrons on the accuracy and resolution of their energy measurement. In this energy range, ionization and bremsstrahlung photon production contribute similarly to electron energy loss in argon, leading to a complex electron topology in the TPC. By profiling the performance of the reconstruction algorithm on simulation we show that the ability to identify and include energy deposited by radiative photons leads to a significant improvement in the energy measurement of low-energy electrons. The fractional energy resolution we measure improves from over 30% to ∼ 20% when we attempt to include radiative photons in the reconstruction. These studies are relevant to a large number of analyses which aim to study neutrinos by measuring electrons produced by ν e interactions over a broad energy range. Keywords: Michel electrons, LArTPC, MicroBooN
Letter from [John Victor Carson], Dominguez Estate Company to MR. John L. Wyatt, June 20, 1938
No full textReferring Mr. Wyatt to Mr. H.H. Jarrett concerning land sales
The Ā 'īn-i Akbarī /
No full textAnast. herdr.: Calcutta: Royal Asiatic Society, 19271. transl. from the original Persian by H. Blochmann; rev. and ed. by D. C. Phillott2. A gazetteer and administrative manual of Akbar's empire and past history of India / transl. from the original Persian by H.S. Jarrett ; corr. and further ann. by Jadunath Sarkar.3. An encyclopaedia of Hindu philosophy, science, literature and customs, with the life of the author and Akbar's wise sayings / transl. from the original Persian by H.S. Jarrett ; corr. and further ann. Jadunath Sarkar
Hunting Muon Neutrinos in MicroBooNE with Deep Learning Techniques
No full textThe MicroBooNE experiment is a large Liquid Argon TPC located on the Booster Neutrino Beam at Fermi National Laboratory. The primary goal is to investigate the source of the excess of low energy electron neutrino events observed by the MiniBooNE experiment. The main background to the oscillation signal arises from intrinsic electron neutrinos coming from decay of pions and muons in the beam rather than oscillation. To constrain the systematic uncertainty on this background, MicroBooNE will perform a combined fit to both the muon and electron neutrino spectra. This method provides constraints on flux, cross section, and detector uncertainties. This poster will discuss the identification and selection of muon neutrino events using a novel hybrid approach of Deep Learning and traditional reconstruction algorithms that can be used for this constraint
Two Kentuckians: Historian Otto Arthur Rothert ; Et al.
No full textTwo Kentuckians
Articles from Gladys Jarrett
Historian Otto Arthur Rothert
Author Elizabeth Madox Robert
Hobbes's concept of the egoistic state of nature extended to international relations as an explanatory model for analyzing the motivations behind the September 11 terrorist attacks, 2005
No full textThis study examines the motivations of the terrorist organization al Qaeda in facilitating the September 11 terrorist attacks involving the hijacking of four commercial jets and the subsequent crashing of two of these aircraft into the World Trade Center in New York, one into the Pentagon in Washington D.C., and a fourth into an abandoned field. This study was based on the premise that extending Hobbes's concept of the egoistic state of nature to the conditions prevalent in international relations lends itself to an explanatory analysis of what motivated al Qaeda to facilitate the September 11 terrorist attacks. A descriptive analysis of the applicable aspects of Hobbes's political philosophy was performed for the purpose of establishing a conceptual relationship between Hobbes's notion of the egoistic state of nature and the violent conditions that exist in global affairs that lead to political violence like the September 11 terrorist attacks. The conclusions drawn from the findings suggest that there is a conceptual relationship between Hobbes's concept of the egoistic state of nature extended to international relations and the motivations that led al Qaeda to facilitate the September 11 attacks. Secondly, if steps are not taken to lessen the Hobbesian state of nature conditions prevalent in international affairs, then terrorist acts like the September 11 attacks will continue in the future
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