179 research outputs found
Studying microstructure and phase composition of a new complex calcium containing alloy
In the given article there are presented the results of studying the microstructure and phase structure of a complex alloy of alumosilicon with calcium. It is established that in the studied CAMS alloy active elements are present at a type of difficult intermetallid that positively influences quality of both ordinary, and qualitative brands of steel
Design and Status of the Dipole Spectrometer Magnet for the ALICE Experiment
Proposal of abstract for MT16, Tallahesse, Florida, 26th September to 2nd October 1999.A large Dipole Magnet is required for the Muon Arm Spectrometer of the ALICE experiment at the LHC.The absence of strong requirements on the symmetry and homogeneity of the magnetic field has lead to a design dominated by economic and feasibility considerations.In March 1997 the decision was taken to build a resistive dipole magnet for the muon spectrometer of the ALICE experiment. Since then, design work has been pursued in JINR/Russia and at CERN. While a common concept has been adopted for the construction of the steel core, two different proposals have been made for the manufacturing technology of the excitation coils. In both cases, however, the conductor material will be Aluminium.The general concept of the dipole magnet is based on a window frame return yoke, fabricated from low carbon steel sheets. The flat vertical poles follow the defined acceptance angle of 9 degrees. The excitation coils are of saddle type. The coils are wound from large hollow Aluminium profiles. They are cooled by pressurized demineralised water. The coil ends are located to both sides of the magnet yoke and determine the overall length of the magnet. The main flux direction in the gap is horizontal and perpendicular to the LHC beam axis.Both coil concepts and the underlying manufacturing technology are compared and the present status of the development of the magnet is described
Very high quality factor measured in annealed fused silica
We present the results of quality factor measurements for rod samples made of
fused silica. To decrease the dissipation we annealed our samples. The highest
quality factor that we observed was for a mode at
384 Hz. This is the highest published value of in fused silica measured to
date.Comment: 8 pages, 2 figure
A twist in chiral interaction between biological helices
Using an exact solution for the pair interaction potential, we show that
long, rigid, chiral molecules with helical surface charge patterns have a
preferential interaxial angle ~((RH)^1/2)/L, where L is the length of the
molecules, R is the closest distance between their axes, and H is the helical
pitch. Estimates based on this formula suggest a solution for the puzzle of
small interaxial angles in a-helix bundles and in cholesteric phases of DNA.Comment: 7 pages, 2 figures, PDF file onl
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A proposal to study small angle p -p scattering at very high energies
We propose to measure small angle p-p scattering by using a thin foil and a hydrogen jet target to intercept a small fraction of the beam without interference with the acceleration process. The measurements are based on the detection of the slow recoil proton and will yield the energy dependence of (a) the slope of the p-p nuclear diffraction peak, (b) the real part of the nuclear scattering amplitude, (c) the diffractive excitation of isobars. The proposed technique is energy independent and will provide data over the entire energy region from 25 GeV to the highest energy achieved by NAL. Total accelerated beam intensities of 10{sup 11} to 10{sup 12} protons/pulse are quite adequate. The equipment is presently under development and could be fully operational by June 1971
A qualitative correlation between friction coefficient and steel surface wear in linear dry sliding contact to polymers with SGF
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