10,098 research outputs found

    Muon capture for the front end of a muon collider

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    We discuss the design of the muon capture front end for a \mu+-\mu- Collider. In the front end, a proton bunch on a target creates secondary pions that drift into a capture transport channel, decaying into muons. A sequence of rf cavities forms the resulting muon beams into strings of bunches of differing energies, aligns the bunches to (nearly) equal central energies, and initiates ionization cooling. The muons are then cooled and accelerated to high energy into a storage ring for high-energy high luminosity collisions. Our initial design is based on the somewhat similar front end of the International Design Study (IDS) neutrino factory.Comment: 3 pp. Particle Accelerator, 24th Conference (PAC'11) 28 Mar - 1 Apr 2011: New York, US

    Tracking Users across the Web via TLS Session Resumption

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    User tracking on the Internet can come in various forms, e.g., via cookies or by fingerprinting web browsers. A technique that got less attention so far is user tracking based on TLS and specifically based on the TLS session resumption mechanism. To the best of our knowledge, we are the first that investigate the applicability of TLS session resumption for user tracking. For that, we evaluated the configuration of 48 popular browsers and one million of the most popular websites. Moreover, we present a so-called prolongation attack, which allows extending the tracking period beyond the lifetime of the session resumption mechanism. To show that under the observed browser configurations tracking via TLS session resumptions is feasible, we also looked into DNS data to understand the longest consecutive tracking period for a user by a particular website. Our results indicate that with the standard setting of the session resumption lifetime in many current browsers, the average user can be tracked for up to eight days. With a session resumption lifetime of seven days, as recommended upper limit in the draft for TLS version 1.3, 65% of all users in our dataset can be tracked permanently.Comment: 11 page

    Optimization of the Target Subsystem for the New g-2 Experiment

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    A precision measurement of the muon anomalous magnetic moment, aμ=(g−2)/2a_{\mu} = (g-2)/2, was previously performed at BNL with a result of 2.2 - 2.7 standard deviations above the Standard Model (SM) theoretical calculations. The same experimental apparatus is being planned to run in the new Muon Campus at Fermilab, where the muon beam is expected to have less pion contamination and the extended dataset may provide a possible 7.5σ7.5\sigma deviation from the SM, creating a sensitive and complementary bench mark for proposed SM extensions. We report here on a preliminary study of the target subsystem where the apparatus is optimized for pions that have favorable phase space to create polarized daughter muons around the magic momentum of 3.094 GeV/c, which is needed by the downstream g 2 muon ring.Comment: 4 pp. 3rd International Particle Accelerator Conference (IPAC 2012) 20-25 May 2012, New Orleans, Louisian

    Bear River Resource Conservation and Development Council, Inc., 2006 Annual Report

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    Developing Both Commodity and Niche Markets for Cow Nose Ray

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    Our project was to continue developing a three-tiered market for ray. The market tiers on which some work has already been done are: a high end domestic market with an emphasis on marketing to distributors; a commodity market for the foreign export of container sized loads of ray wings; and a bait market for the parts of the ray not used for human consumption

    Developing Both Commodity and Niche Markets for Cow Nose Ray 2007 Final Report

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    The purpose or our project was to help develop a three-tiered market for Cow Nose Ray

    Vedolizumab: an α4β7 integrin antagonist for ulcerative colitis and Crohn’s disease

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    Ulcerative colitis (UC) and Crohn’s disease (CD) are chronic, relapsing inflammatory bowel diseases associated with significant morbidity. Conventional therapies for these diseases include corticosteroids, aminosalicylates, immunomodulators, and monoclonal antibodies. Over the years tumor necrosis factor (TNF)-α antagonists alone or in combination with other therapies have emerged as the cornerstone of treatment for induction and maintenance of remission of moderate to severe UC and CD. Unfortunately, some patients with moderate to severe UC and CD are unable to attain or maintain remission with TNF-α antagonist treatment. Vedolizumab, a humanized monoclonal antibody, is the first integrin receptor antagonist approved that selectively antagonizes α4β7 gastrointestinal integrin receptors. US Food and Drug Administration approval is for treatment of patients with moderate to severe active UC and CD who have inadequate response with, lost response to, or are intolerant to a TNF-α antagonist or an immunomodulator; or have inadequate response with, are intolerant to, or demonstrate dependence on corticosteroids. When administered according to approved dosing in patients with moderate to severe CD and UC, vedolizumab induces clinical response rates up to 31.4% and 47.1% at week 6, and clinical remission rates up to 39% and 41.8% at week 52, respectively. Serious adverse events reported with vedolizumab include serious infections, malignancies, and anaphylaxis. Since vedolizumab is gastrointestinal selective, to date, it has not shown evidence of causing progressive multifocal leukoencephalopathy; however, postmarketing studies monitoring for this adverse effect are ongoing. Further assessment of vedolizumab earlier in the course of these diseases and in combination with other therapies is warranted

    Measuring users\u27 impact to support economic growth through Transportation Asset Management planning

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    The Moving Ahead for Progress in the 21st Century Act (MAP-21), was enacted by the US Congress to support the economic growth of regions. With this in mind, the state Departments of Transportation (DOT) policies for allocating construction and maintenance funds for infrastructural rehabilitation represent a mechanism to spur economic growth. Economic downturns highlight the importance of a transparent, cost-effective methodology for allocation of scarce resources that provide equity to the entire population of road users. The paper proposes adding social and economic components to the current traffic-based prioritisation method for low-volume, rural bridges in Iowa and evaluates the potential change in the distribution of funding among the state\u27s structurally deficient bridges. The proposed method illustrates the value-added of transportation infrastructure projects to the state\u27s agricultural economy, concluding that the addition of socioeconomic factors to the current decision-making process can increase the net benefit of the investments in low-volume bridges to the state\u27s agricultural economy

    Defects and boundary layers in non-Euclidean plates

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    We investigate the behavior of non-Euclidean plates with constant negative Gaussian curvature using the F\"oppl-von K\'arm\'an reduced theory of elasticity. Motivated by recent experimental results, we focus on annuli with a periodic profile. We prove rigorous upper and lower bounds for the elastic energy that scales like the thickness squared. In particular we show that are only two types of global minimizers -- deformations that remain flat and saddle shaped deformations with isolated regions of stretching near the edge of the annulus. We also show that there exist local minimizers with a periodic profile that have additional boundary layers near their lines of inflection. These additional boundary layers are a new phenomenon in thin elastic sheets and are necessary to regularize jump discontinuities in the azimuthal curvature across lines of inflection. We rigorously derive scaling laws for the width of these boundary layers as a function of the thickness of the sheet
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