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A.A. Yukhimchuk V.A. Apasov Yu.I. Vinogradov A.N. Golubkov E.V. Gornostaev S.K. Grishechkin L.V. Drakin N.A. Zagoruiko V.N. Istratov P.D. Ishkov A.A. Kononenko G.I. Karyakin V.G. Klevtsov V.A. Klisch V.N. Lobanov A.P. Maksimenko S.S. Matveev A.E. Nikitin V.I. Pustovoy I.I. Sukhoi V.M. Solyankin B.N. Tenyaev V.M. Kharitonov 《Hyperfine Interactions》1999,119(1-4):341-344
A facility is described that allows safe handling of high tritium gas activity as dozens kilocuries in a regular laboratory
environment. It is used to make and deliver into the target a mixture of specific isotopic composition with the contamination
requirement of 10-7 v.f. for Z>1 elements, and recover it upon completion of operation. With this facility, efforts have been accomplished to investigate
into the muon catalyzed fusion on two targets – liquid tritium and high-pressure tritium types. Also, the operation range
was 0.1–120 MPa for pressure and 20–800 K for temperature and the amount of tritium used was about 100 kCi. The facility showed
reliability in operation without indications of radiation beyond the safety level.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
2.
We have investigated the superconducting properties of the Bi1.7 Pb0.3Sr2Ca2−xCe
x
Cu3O10+δ system with x=0.00, 0.02, 0.04, 0.08 and 0.1 by X-ray diffraction and magnetic susceptibility. The substitution of Ce for Ca has been found
to drastically change the superconducting properties of the system. X-ray diffraction studies on these compounds indicate
decrease in the c-parameter with increased substitution of Ce at Ca site and volume fraction of high T
c (2 : 2 : 2 : 3) phase decreases and low T
c phase increases. The magnetic susceptibility of this compound shows that the diamagnetic on set superconducting transition
temperature (onset) varies from 109 K to 51 K for x=0.00, 0.02, 0.04, 0.08 and 0.1. These results suggest the possible existence of Ce in a tetravalent state rather than a trivalent
state in this system; that is, Ca2+ → Ce4+ replacement changes the hole carrier concentration. Hole filling is the cause of lowering T
c of the system. 相似文献
3.
We have deposited relatively thick (∼60 nm) Ge layers on Br-passivated Si(111) substrates by thermal evaporation under high
vacuum conditions at room temperature. Ge has grown in a layer-plus-island mode although it is different from the Stranski-Krastanov
growth mode observed in epitaxial growth. Both the islands and the layer are nanocrystalline. This appears to be a consequence
of reduction of surface free energy of the Si(111) substrate by Br-passivation. The size distribution of the Ge nanoislands
has been determined. The Br-Si(111) substrates were prepared by a liquid treatment, which may not produce exactly reproducible
surfaces. Nevertheless, some basic features of the nanostructural island growth are reasonably reproducible, while there are
variations in the details of the island size distribution. 相似文献
4.
L. B. Gorbushina L. Ya. Zhiltsova E. N. Matveeva N. A. Surganova V. G. Tenyaev V. G. Tyminsky 《Journal of Radioanalytical and Nuclear Chemistry》1972,10(2):165-172
A method is presented for the determination of uranium isotopes in waters by the scintillation-extraction method. By extraction
with tributyl phosphate (TBP) in toluene as a liquid scintillator it was established that the presence of TBP in the solvent
does not affect the photo-yield substantially. The optimum measuring conditions and the sensitivity of the method have been
studied. 相似文献
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