1,680 research outputs found
Status report of the CMS superconducting coil project
The CMS superconducting coil is designed for one of the two large experiments of LHC at CERN. This coil 12.5 m long, 6 m diameter and 2.7 GJ stored energy is a common project of the CMS Collaboration. It is a four-layer coil, equipped with a self-supporting conductor capable of carrying 20 kA to reach the maximum potential field of 4 T. It has been designed with a considerable contribution from CEA- Saclay for the engineering, ETH-Zurich for the conductor, INFN-Genova for the winding and CERN for the general coordination and construction of the ancillaries. The project entered the construction phase one year ago. The civil engineering is well advanced and ready to accept part of the yoke components already built. The coil itself has finished the pre-industrialization phase and the construction is beginning in industry. Most of the important contracts have been awarded and the foreseen schedule is now based on contractual engagements. A quick overview of the features of the project as well as a status report of the main activities are given. (6 refs)
3D Magnetic Analysis of the CMS Magnet
The CMS magnetic system consists of a super-conducting solenoid coil, 12.5 m
long and 6 m free bore diameter, and of an iron flux-return yoke, which
includes the central barrel, two end-caps and the ferromagnetic parts of the
hadronic forward calorimeter. The magnetic flux density in the center of the
solenoid is 4 T. To carry out the magnetic analysis of the CMS magnetic system,
several 3D models were developed to perform magnetic field and force
calculations using the Vector Fields code TOSCA. The analysis includes a study
of the general field behavior, the calculation of the forces on the coil
generated by small axial, radial displacements and angular tilts, the
calculation of the forces on the ferromagnetic parts, the calculation of the
fringe field outside the magnetic system, and a study of the field level in the
chimneys for the current leads and the cryogenic lines. A procedure to
reconstruct the field inside a cylindrical volume starting from the values of
the magnetic flux density on the cylinder surface is considered. Special
TOSCA-GEANT interface tools have being developed to input the calculated
magnetic field into the detector simulation package.Comment: 4 pages, 6 figures, 1 equation, 14 reference
Hole-burning experiments within solvable glassy models
We reproduce the results of non-resonant spectral hole-burning experiments
with fully-connected (equivalently infinite-dimensional) glassy models that are
generalizations of the mode-coupling approach to nonequilibrium situations. We
show that an ac-field modifies the integrated linear response and the
correlation function in a way that depends on the amplitude and frequency of
the pumping field. We study the effect of the waiting and recovery-times and
the number of oscillations applied. This calculation will help descriminating
which results can and which cannot be attributed to dynamic heterogeneities in
real systems.Comment: 4 pages, 8 figures, RevTe
Борьба с биообрастанием природных и сточных вод с использованием энергетических воздействий
Данная работа посвящена анализу методов очистки воды для борьбы с биологическим обрастанием технологического оборудования. Рассмотрены различные способы борьбы с биологическим обрастанием, в том числе: реагентные, безреагентные и электрические. Сформирована концепция применения способа борьбы с биологическим обрастанием технологического оборудования путем электрической обработки теплоносителя. Приведена схема установки, таблица результатов и диаграмма.This work is devoted to the analysis of methods of water purification for fight against biological fouling of processing equipment. Various ways of fight against biological fouling are considered, including: reagent, reagentless and electric. The concept of application of a way of fight against biological fouling of processing equipment by electric processing of the heat carrier is created. The scheme of installation, the table of results and the chart is provided
Mechanical characteristics of the hypereutectic silumin processed by ionelectron-plasma modification
In this paper, the possibility of modifying the surface of a hypereutectic silumin (Al-(18-24) wt.%Si) is shown. Modification of the samples was carried out in two stages. At the first stage, a "film (Zr-5% Ti-5% Cu) / (Al- (18-24) wt.% Si) film system was formed by an ion-plasma method with an arc-sputtering of a Zr-5% Ti-5 cathode % Cu in the "TRIO" installation (IHCE SB RAS). In the second stage, the surface layer of the silumin of the hypereutectic composition was doped by melting the "film-substrate" system with an intense pulsed electron beam at the "SOLO" installation
Rational Design of a Chalcogenopyrylium-Based Surface-Enhanced Resonance Raman Scattering-Nanoprobe with Attomolar Sensitivity
High sensitivity and specificity are two desirable features in biomedical imaging. Raman imaging has surfaced as a promising optical modality that offers both. Here, we report the design and synthesis of a group of near infrared absorbing 2-thienyl-substituted chalcogenopyrylium dyes tailored to have high affinity for gold. When adsorbed onto gold nanoparticles, these dyes produce biocompatible SERRS-nanoprobes with attomolar limits of detection amenable to ultrasensitive in vivo multiplexed tumor and disease marker detection
The U-shapes of occupational mobility
Using administrative panel data on 100 % of Danish population we document a new set of facts characterizing the patterns of occupational mobility. We find that a worker’s probability of switching occupation is U-shaped in his position in the wage distribution in his occupation. It is the workers with the highest or lowest wages in their occupations who have the highest probability of leaving the occupation. Workers with higher (lower) relative wage within their occupation tend to switch to occupations with higher (lower) average wages. Higher (lower) paid workers within their occupation tend to leave it when relative productivity of that occupation declines (rises). These facts are not implied by existing theories of occupational mobility that mostly treat occupations as horizontally differentiated sets of tasks. We suggest that it might be productive to think of occupations as forming vertical hierarchies. Workers who are unsure of their abilities learn about them by observing their output realizations. Employment opportunities in each occupation are scarce inducing competition among workers for them. Complementarities in the production function between worker’s ability and productivity of an occupation induce sorting of workers into occupations according to their expected ability. We present an equilibrium model of occupational choice with these features and show analytically that it is consistent with patterns of mobility described above
Evaluation of motor transport drivers professional suitability using road traffic simulator
The article considers a method that allows to determine the degree of development of professionally important qualities of motor vehicle drivers on the basis of the developed hardware-software complex of traffic simulation. The technique of convolution of the test results on the auto-simulator and on the complex of psychological tests "Effecton" is developed. The proposed approach allows to determine the degree of correlation between the results of the developed simulation tests and existing universal psychological tests
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