14,008 research outputs found
Teachers guide for building and operating weather satellite ground stations for high school science
A number of colleges and universities are operating APT direct readout stations. However, high school science teachers have often failed to realize the potential of meteorological satellites and their products as unique instructional tools. The ability to receive daily pictures from these satellites offers exciting opportunities for secondary school teachers and students to assemble the electronic hardware and to view real time pictures of Earth from outer space. The station and pictures can be used in the classroom to develop an approach to science teaching that could span many scientific disciplines and offer many opportunities for student research and participation in scientific processes. This can be accomplished with relatively small expenditures of funds for equipment. In most schools some of the equipment may already be available. Others can be constructed by teachers and/or students. Yet another source might be the purchase of used equipment from industry or through the government surplus channels. The information necessary for individuals unfamiliar with these systems to construct a direct readout for receiving real time APT photographs on a daily basis in the classroom is presented
The force, power and energy of the 100 meter sprint
At the 2008 Summer Olympics in Beijing, Usain Bolt broke the world record for
the 100 m sprint. Just one year later, at the 2009 World Championships in
Athletics in Berlin he broke it again. A few months after Beijing, Eriksen et
al. studied Bolt's performance and predicted that Bolt could have run about
one-tenth of a second faster, which was confirmed in Berlin. In this paper we
extend the analysis of Eriksen et al. to model Bolt's velocity time-dependence
for the Beijing 2008 and Berlin 2009 records. We deduce the maximum force, the
maximum power, and the total mechanical energy produced by Bolt in both races.
Surprisingly, we conclude that all of these values were smaller in 2009 than in
2008
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Plastic Microbial Acclimation and Optimisation of Composting and Anaerobic Digestion Processes may Improve Degradation Times
Recent Developments
In a free speech and free exercise case involving the Business Leaders in Christ at the University of Iowa, the Eighth Circuit Court of Appeals reversed the Southern District of Iowa by holding that University officials should not be granted qualified immunity based on the student organizationâs free speech claim
A 233 km Tunnel for Lepton and Hadron Colliders
A decade ago, a cost analysis was conducted to bore a 233 km circumference
Very Large Hadron Collider (VLHC) tunnel passing through Fermilab. Here we
outline implementations of , , and collider
rings in this tunnel using recent technological innovations. The 240 and 500
GeV colliders employ Crab Waist Crossings, ultra low emittance damped
bunches, short vertical IP focal lengths, superconducting RF, and low
coercivity, grain oriented silicon steel/concrete dipoles. Some details are
also provided for a high luminosity 240 GeV collider and 1.75 TeV
muon accelerator in a Fermilab site filler tunnel. The 40 TeV
collider uses the high intensity Fermilab source, exploits high cross
sections for production of high mass states, and uses 2 Tesla ultra
low carbon steel/YBCO superconducting magnets run with liquid neon. The 35 TeV
muon ring ramps the 2 Tesla superconducting magnets at 9 Hz every 0.4 seconds,
uses 250 GV of superconducting RF to accelerate muons from 1.75 to 17.5 TeV in
63 orbits with 71% survival, and mitigates neutrino radiation with phase
shifting, roller coaster motion in a FODO lattice.Comment: LaTex, 6 pages, 1 figure, Advanced Accelerator Concepts Workshop,
Austin, TX, 10-15 June 201
Recent Developments
In a free speech and free exercise case involving the Business Leaders in Christ at the University of Iowa, the Eighth Circuit Court of Appeals reversed the Southern District of Iowa by holding that University officials should not be granted qualified immunity based on the student organizationâs free speech claim
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