144 research outputs found

    Digital electromagnetic calorimeters for future collider applications

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    The LHC will run until \sim2040, after which time a new generation of particle colliders is anticipated. To measure the properties of known interactions at the LHC with greater precision, and to probe physics beyond the Standard Model, it is expected that a lepton collider will be constructed. This thesis focuses on the application of digital CMOS MAPS sensors to electromagnetic calorimetry at future colliders. Simulations of various geometrical configurations of a digital ECAL in the FCC-hh environment, a proposed 100TeV circular proton-proton collider, are presented. The optimal configuration using 50 silicon layers sandwiched between 0.6X0X_0 thick layers of lead is found to provide an energy resolution of σEμE=(15.46±0.12%E)(0.917±0.009%)\frac{\sigma_E}{\mu_E} = \left(\frac{15.46\pm0.12\%}{\sqrt{E}}\right) \oplus (0.917\pm0.009\%). While this is a slightly poorer standalone resolution than the liquid argon baseline ECAL, this detector technology enables improved combination with information from the inner tracker due to its higher granularity, which may be required to mitigate the high pile-up regime in FCC-hh. Beam tests of a digital ECAL prototype with 48 ALPIDE sensors (EPICAL-2) are analysed. An event selection algorithm for EPICAL-2 is presented and its merits and performance are evaluated. The response of EPICAL-2 is analysed, and the intrinsic resolution from electron beam tests in the range 1--5~GeV found to be σμ=(18.7%E)(2.4%)\frac{\sigma}{\mu} = \left(\frac{18.7\%}{\sqrt{E}}\right) \oplus (2.4\%) when a simple clustering algorithm is applied. The performance is also modelled in Allpix2^2 simulations, and the resolution from simulations found to be σμ=(14.0%E)(2.6%)\frac{\sigma}{\mu} = \left(\frac{14.0\%}{\sqrt{E}}\right) \oplus (2.6\%). This is comparable to the CALICE analogue ECAL prototype and a significant improvement upon the resolution of the previous EPICAL-1 prototype. The lateral profiles of EPICAL-2 are presented and the maximum hit density for a 5~GeV electron beam is found to be approx\\approx300hits/mm2^2. Lastly, the forward-backward asymmetry of EPICAL-2 is examined and its causes identified using simulations

    Advanced magnetic suspensions for vibration isolation and fast-attitude control of space-based generic pointing mounts

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    Advanced magnetic suspension for vibration isolation and fast-attitude control of space-based generic pointing mounts (GPM) is presented in the form of viewgraphs. The following subject areas are covered: design criteria for GPM; GPM system features; GPM performance characteristics; GPM functional block diagram; and other applications for generic magnetic suspension technologies

    Learning to Create Jazz Melodies Using Deep Belief Nets

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    We describe an unsupervised learning technique to facilitate automated creation of jazz melodic improvisation over chord sequences. Specifically we demonstrate training an artificial improvisation algorithm based on unsupervised learning using deep belief nets, a form of probabilistic neural network based on restricted Boltzmann machines. We present a musical encoding scheme and specifics of a learning and creational method. Our approach creates novel jazz licks, albeit not yet in real-time. The present work should be regarded as a feasibility study to determine whether such networks could be used at all. We do not claim superiority of this approach for pragmatically creating jazz

    P1_1 The Chief ’s Downfall

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    In this paper, we calculate an estimate of the Master Chief’s vertical velocity with varying altitude and atmospheric density as he falls towards Earth in the game Halo 3. We plot the velocity over the fall as a function of time and estimate the final velocity to be 69.6ms-1

    Abnormal Ocular Pneumoplethysmographic Results in Unilateral Neovascular Glaucoma.

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    Little is known about the predictive value of ocular pneumoplethysmography in patients with ophthalmic disease. We evaluated eight patients with unilateral increased intraocular pressure due to neovascular glaucoma who did not have evidence of severe extracranial carotid stenosis by duplex scanning and continuous-wave Doppler ultrasound. The ophthalmic systolic pressure measured by ocular pneumoplethysmography was decreased in the affected eye of all eight patients, indicating that neovascular glaucoma may be a cause of abnormal ocular pneumoplethysmographic results. Patients with neovascular glaucoma tended to have larger interocular ophthalmic systolic pressure differences than other patients with false-positive ocular pneumoplethysmographic results by noninvasive criteria

    Research-Based Web Design & Usability Guidelines [2006 edition]

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    The new edition of the U.S. Department of Health and Human Services’ (HHS) Research-Based Web Design and Usability Guidelines. These guidelines reflect HHS’ commitment to identifying innovative, research-based approaches that result in highly responsive and easy-to-use Web sites for the public. These guidelines help move us in that direction by providing practical, yet authoritative, guidance on a broad range of Web design and communication issues. Having access to the best available research helps to ensure we make the right decisions the first time around and reduces the possibility of errors and costly mistakes

    Implementing The Prison Rape Elimination Act: A Toolkit for Jails

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    Minor edits. “The goal of this Toolkit is to provide jails of all sizes, political divisions, and geographic locations with a step-by-step guide for preventing, detecting, and eliminating sexual abuse of inmates in their custody – and for responding effectively to abuse when it occurs. Prison rape includes all forms of inmate sexual abuse within a correctional facility, including state and federal prisons, county and municipal jails, police lock-ups, holding facilities, inmate transportation vehicles, juvenile detention facilities, and community corrections facilities. Protecting arrestees, detainees, and inmates from sexual violence is part of a jail’s core mission. This toolkit will help assess your jail’s operations with an eye to improvements.” The Toolkit is divided into folders holding materials related to: introductory information about PREA [Prison Rape Elimination Act] and it Standards; a Self-Assessment Checklist with supporting forms “to provide a step-by-step process for jails to review and assess policies, procedures, and practices in light of the PREA Standards and accepted best practices”; and additional resources to assist you in PREA-readiness
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