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1.
The investigation was made of the dependence of the intensity of Tl, Ga, Mo, Mg, Mn, Sn, Bi, Ni, Zn, Pt and Au spectral lines and the plasma parameters (temperature T, electron concentration ne, degree of 6 ionnization α) from concentration of lithium additive. 相似文献
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Design and analysis of the tunnel connecting the beamcorridor and the spectrum hall of the CSNS 总被引:1,自引:0,他引:1
There is a tunnel connecting the beamcorridor and the target station in the spectrum hall in the CSNS project. The length of the tunnel is about 20 m. The shielding design of the tunnel is very significant for the persons working in the spectrum hall because the tunnel is not covered by soil for shielding. In order to reduce the dose rate at the exit of the cable ducts, we use the ISIS construction, which is designed with four turnings, as a reference for the tunnel design. The thickness of the shielding is obtained by a simulation with the Monte Carlo Code FLUKA. The result is compared with the data obtained with Moyer Mode and the reliability of the simulation is proved. This paper provides the basis for the design of the tunnel. 相似文献
3.
Design and analysis of the tunnel connecting the beamcorridor and the spectrum hall of the CSNS 下载免费PDF全文
There is a tunnel connecting the beamcorridor and the target station in the spectrum hall in the CSNS project.The length of the tunnel is about 20 m.The shielding design of the tunnel is very significant for the persons working in the spectrum hall because the tunnel is not covered ed soil for shielding.In order to reduce the dose rate at the exit of the cable ducts,we use the ISIS construction,which is designed with four turnings,as a reference for the tunnel design.The thickness of the shielding is obtained by a simulationwith the Monte Carlo Code FLUKA.The result is compared with the data obtained with Moyer Mode and the reliability of the simulation is proved.This paper provides the basis for the design of the tunnel. 相似文献
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T. Rador 《The European Physical Journal C - Particles and Fields》2007,52(3):683-688
Cosmologically stabilizing radion along with the dilaton is one of the major concerns of low energy string theory. One can
hope that T and S dualities can provide a plausible answer. In this work we study the impact of S and T duality invariances
on dilaton gravity. We have shown various instances where physically interesting models arise as a result of imposing the
mentioned invariances. In particular S duality has a very privileged effect, in that the dilaton equations partially decouple
from the evolution of the scale factors. This makes it easy to understand the general rules for the stabilization of the dilaton.
We also show that certain T duality invariant actions become S duality invariance compatible. That is, they mimic S duality
when the extra dimensions stabilize. 相似文献
6.
文章对微波背景辐射的各向异性、偏振及宇宙电离的历史给出了评述性介绍.从大爆炸理论的预言,到观测的发现,到其各向异性及偏振的探测,微波背景辐射(CMB)向人们揭示了丰富的宇宙学信息.文章在对基本理论作了简单介绍后,着重讲述了最新的CMB的观测结果及其物理意义.特别对微波背景各向异性探测器(Wilkinson Microwave Anisotropy Probe,WMAP)的偏振观测及其对宇宙重新电离的限制给出了较详细的叙述. 相似文献
7.
A model of symmetries and gauge interactions relating the electron and muon is considered. The model is based on the UL(1)?UR(1)?RL?RR group where UL(1)?UR(1) denotes the chiral e-μ rotation and RL?RR the chiral reflection of the electron field. The invariance under this group is spontaneously broken by the vacuum expectation values of scalar fields. A zeroth-order vacuum is found for which the zeroth-order electron mass vanishes, while one-loop corrections lead to a finite ratio. The decay process μ → e + γ is strictly forbidden in this model. 相似文献
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Summary Since September 1983, the Matera laser station started regular tracking activities with the geodetic satellites Lageos and
Starlette. The Matera station operates in co-ordination with the international network of geodetic laser stations, and participates
to the NASA Crustal Dynamics Project and to the MERIT Campaign promoted by IAU. The first part of this paper reports on the
operational activities at the station and on the performance of the instrumentation. The second part describes the models
adopted for data processing and presents the results obtained through the analysis of the Lageos observations acquired from
September '83 to August '84. The preliminary estimates of the geodetic co-ordinates of five European laser stations and of
their baselines are given.
The activity reported in this paper is performed under the contract of Consiglio Nazionale delle Ricerche-Piano Spaziale Nazionale-to
Telespazio for Matera laser station operation and performance analysis. 相似文献
10.
Hailiang ZhangMingfu Zhang Jiecai HanGuobing Ying Huaixin GuoChenghai Xu Haitao ShenNingning Song 《Applied Surface Science》2011,257(11):5012-5016
In this paper, MgO film is successfully grown on polycrystalline and monocrystalline alumina substrates using sol-gel method, and polycrystalline and monocrystalline Mg-Al spinels are fabricated by solid state reaction, respectively. The influence of annealing temperature and time on the lattice structure and growth of the formed Mg-Al spinel layer has been investigated. It is indicated that the annealing temperature and time on the as-synthesized polycrystalline Mg-Al spinel has more significant influence than that of single crystal Mg-Al spinel. The thickness of the Mg-Al spinel layer increases with the annealing temperature, both for polycrystalline and for monocrystalline alumina substrates. And the significantly intercrystalline diffusion of Mg2+ ions and Al3+ ions results in a quicker growth velocity of the Mg-Al spinel layer than that of intracrystalline diffusion. 相似文献
11.
R. Plaga 《Zeitschrift für Physik A Hadrons and Nuclei》1989,333(4):397-403
The consequences of a violation of the Pauli principle for the physics of the solar interior are explored. It is found that a bound state of two protons becomes possible. This leads to an increase in the rate of hydrogen burning in the sun. Because a very large cross section for this reaction is in clear contradiction with the theory of stellar structure when compared with observations of solar luminosity, radius and mechanical oscillations, stringent limits on a violation of the Pauli principle in the two nucleon system can be given. However, a very small violation of the Pauli principle in the two nucléon system might solve the longstanding solar neutrino problem. 相似文献
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 50, No. 6, pp. 906–912, June, 1989. 相似文献
13.
The case of the presence of matter in the R domain near the R-T boundary is examined. Using the relations between fixed and nonsingular reference systems at the boundary, estimates are obtained for the behavior of the velocities and the metric tensor components in the fixed reference system on the boundary of the R and T domains. On this basis estimates are obtained for the behavior of the energy-momentum tensor components on the R and T boundary in the fixed reference system and the locally Lorentz reference system.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 3, pp. 94–98, March, 1978.In conclusion, we are grateful to Igor Dmitrievich Novikov for valuable remarks. 相似文献
14.
S. N. Moiseyev 《Radiophysics and Quantum Electronics》2000,43(11):866-870
On the basis of partial and multiple correlation relations, we calculate the predictability time and the order of a stochastic differential equation for the screening and limiting frequencies of the ionospheric midlatitude sporadic E layer. 相似文献
15.
A study of kinematics of a 2-body system is used to show that the Mach principle, previously rejected by general relativity, can still serve as an alternative to the concept of absolute space, if one assumes that the background of distant stars determines both the inertial and the gravitational masses of a body.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 6, pp. 10–13, June, 1990. 相似文献
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The vibrational relaxation of OCl and OCl− in the bulk and the liquid/vapor interface of water and acetonitrile is studied by molecular dynamics computer simulations. Both equilibrium calculations of the vibrational friction and non-equilibrium simulation of the energy relaxation are used to elucidate the factors that influence the rate of energy relaxation in systems that represent polar ionic and non-ionic solutes in polar protic and non-protic solvents. We find that, in agreement with previous experimental and theoretical studies, the relaxation of the ionic solute is much faster than that of the non-ionic solute in both the solvents. However, while the relaxation is slowed down considerably when the non-ionic solute is transferred from the bulk to the interface, no such surface effect is found in the case of the ionic solute. This behavior can be explained by noting that the ionic solute is able to keep its first solvation shell intact upon transfer to the interface and that the main contribution to the friction is due to the Lennard-Jones part of the intermolecular potential. 相似文献
18.
This article elaborates on the crossing points of the frequency–wavenumber branches for the symmetric and anti-symmetric Lamb modes in a homogeneous plate. It is shown both theoretically as well as experimentally that at these crossing points either the normal or the longitudinal components of modal displacement attain an extreme value, i.e. a maximum or it vanishes. This behavior is assessed herein using a method due to Mindlin, who showed that the dispersion curves for a plate with mixed boundary conditions – which are associated with uncoupled shear and dilatational modes – provide bounds to the spectral lines of the free plate. Therefore, a subset of the crossing points of the symmetric and antisymmetric Lamb modes for a free plate coincide with the crossing points for a plate with mixed boundary conditions. 相似文献
19.
Pierre Fayet 《Physics letters. [Part B]》1979,84(4):416-420
The mass2 splittings between leptons and quarks and their spin-0 partners under supersymmetry are related to the goldstino couplings. The bosonic partner of the goldstino cannot be the photon itself. But it should be, in part, a linear combination of the various neutral gauge bosons. As a result, mass relations constrain the neutral current structure of the theory. They require the existence of at least two neutral gauge bosons in addition to the photon and suggest the possibility of a universal mass2 splitting between leptons and quarks and their spin-0 partners. 相似文献