3,651 research outputs found
Precision Muon Tracking Detectors for High-Energy Hadron Colliders
Small-diameter muon drift tube (sMDT) chambers with 15 mm tube diameter are a
cost-effective technology for high-precision muon tracking over large areas at
high background rates as expected at future high-energy hadron colliders
including HL-LHC. The chamber design and construction procedures have been
optimized for mass production and provide sense wire positioning accuracy of
better than 10 ?m. The rate capability of the sMDT chambers has been
extensively tested at the CERN Gamma Irradiation Facility. It exceeds the one
of the ATLAS muon drift tube (MDT) chambers, which are operated at
unprecedentedly high background rates of neutrons and gamma-rays, by an order
of magnitude, which is sufficient for almost the whole muon detector acceptance
at FCC-hh at maximum luminosity. sMDT operational and construction experience
exists from ATLAS muon spectrometer upgrades which are in progress or under
preparation for LHC Phase 1 and 2
Precision Muon Tracking at Future Hadron Colliders with sMDT Chambers
Small-diameter muon drift tube (sMDT) chambers are a cost-effective
technology for high-precision muon tracking. The rate capability of the sMDT
chambers has been extensively tested at the Gamma Irradiation Facility at CERN
in view of expected rates at future high-energy hadron colliders. Results show
that it fulfills the requirements over most of the acceptance of muon
detectors. The optimization of the read-out electronics to further increase the
rate capability of the detectors is discussed. Chambers of this type are under
construction for upgrades of the muon spectrometer of the ATLAS detector at
high LHC luminosities. Design and construction procedures have been optimized
for mass production while providing a precision of better than 10 micrometers
in the sense wire positions and the mechanical stability required to cover
large areas.Comment: 5 pages, 12 figures; conference proceedings for IEEE NSS & MIC
conference, San Diego, 201
Resonant and antiresonant bouncing droplets
When placed onto a vibrating liquid bath, a droplet may adopt a permanent
bouncing behavior, depending on both the forcing frequency and the forcing
amplitude. The relationship between the droplet deformations and the bouncing
mechanism is studied experimentally and theoretically through an asymmetric and
dissipative bouncing spring model. Antiresonance effects are evidenced.
Experiments and theoretical predictions show that both resonance at specific
frequencies and antiresonance at Rayleigh frequencies play crucial roles in the
bouncing mechanism. In particular, we show that they can be exploited for
droplet size selection.Comment: 4 pages, 4 figures and 1 vide
Optimum feed combinations and market weights for broilers based on two-variable production functions
Hydraulic structures: Useful water harvesting systems or relics?
Throughout the ages, the construction of hydraulic structures has supported the development of human civilisation. Around 3000 BC, masonry dams on the Nile provided irrigation water in Egypt, while in Mesopotamia canals were built for irrigation, draining swamps and transportation [2, 3, 5]. The 18th and 19th centuries saw the rapid development of water supply systems in response to the industrial development and the needs for reliable water supply [4, 7, 8] (Fig. 1 & 2). More recently, the 1940s to 1970s saw a worldwide boom in large water projects, mainly for consumption, irrigation, transport, hydropower and flood protection [3]. For example, the California Central Valley Project, built between 1933 and 1970, provides irrigation water to over 1.2 million hectares and generates over 1 million kW of power [3]. The rate of construction of new water projects in Europe and North America has dropped during the last few decades, and many of the original water harvesting system mega projects are now near, or even past, their original intended design lives. The question therefore arises whether the existing systems are redundant relics from the past that have reached their sell-by date, or do they still have an important role to play in modern society
Letter from [Robert] Evett to Hubert Creekmore (16 September 1954)
Evett writes from Washington, D.C. on New Republic letterhead to Creekmore in Jackson, Mississippi. Evett asks Creekmore to write an article on the Citizen\u27s Councils, and he states that his only understanding of them comes from a Jackson Clarion-Ledger article. Includes envelope.https://egrove.olemiss.edu/creekmore/1223/thumbnail.jp
Letter from Levi Robert Lind to Hubert Creekmore
Lind is a professor in the Department of Latin and Greek at the University of Kansas in Lawrence, Kansas. He writes on department letterhead from Rome, Italy, to Creekmore in Jackson, Mississippi. He asks if Creekmore has received the translations of Ezra Pound\u27s poetry. Includes envelope.https://egrove.olemiss.edu/creekmore/1246/thumbnail.jp
Letter from Robert M. MacGregor to Hubert Creekmore
MacGregor writes from New York City on New Directions Publishing Corporation letterhead to Creekmore in Jackson, Mississippi, regarding warehouse storage for The Long Reprieve. Includes envelope.https://egrove.olemiss.edu/creekmore/1231/thumbnail.jp
Letter from Robert K. Haas to Hubert Creekmore
Haas is vice president of Random House, Inc. and writes on company letterhead from New York City to Creekmore in Jackson, Mississippi, to praise Creekmore\u27s A Little Treasury of World Poetry.https://egrove.olemiss.edu/creekmore/1125/thumbnail.jp
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