A sand sample collected at the foot of Flaming Mountain was studied further. On the basis of the change in the relative intensity after heat treatment, one of the sextets observed in its Mossbauer spectrum at liquid n...A sand sample collected at the foot of Flaming Mountain was studied further. On the basis of the change in the relative intensity after heat treatment, one of the sextets observed in its Mossbauer spectrum at liquid nitrogen temperature was ascribed to goethite. This result provides a useful information on the geological history of the region where the mountain is located.展开更多
The Excited states of ^(88)Sr have been produced in the reaction ^(16)O(^(82)Se,4p6n)and studied using the in-beam γ spectroscopy techniques.Two high-spin level structures have been observed and established up to 8.5...The Excited states of ^(88)Sr have been produced in the reaction ^(16)O(^(82)Se,4p6n)and studied using the in-beam γ spectroscopy techniques.Two high-spin level structures have been observed and established up to 8.5 MeV and 7.9 MeV excitation energy,respectively.Based on the measurements of the directional correlations ofγ-rays de-exciting oriented states and anisotropic factors ofγ-rays,spin values of the excited states have been assigned up to the highest levels observed.展开更多
A compact pulse radiolysis apparatus using a BNL-type s-band photocathode RF gun is now under development at Waseda University.The laser pulse is used for excitation of the photocathode and for generation of white lig...A compact pulse radiolysis apparatus using a BNL-type s-band photocathode RF gun is now under development at Waseda University.The laser pulse is used for excitation of the photocathode and for generation of white light,which is used for analyzing light in the pulse radiolysis.展开更多
Rare-earth metal diphthalocyanine complexes with R substituents,R_8Pc_2MH(where Pc=phthalocyanine;R=propoxy,t-butyl;M=Er,Lu),were prepared.Their films on basal plane pyrolytic graphite and on indium-tin oxide Ncsa gla...Rare-earth metal diphthalocyanine complexes with R substituents,R_8Pc_2MH(where Pc=phthalocyanine;R=propoxy,t-butyl;M=Er,Lu),were prepared.Their films on basal plane pyrolytic graphite and on indium-tin oxide Ncsa glass electrodes in several aqueous electrolytes were investigated by voltammetric analysis and in situ electronic absorption spectroscopy at controlled potentials.These modified electrodes showed multi-color electrochromic behavior as a result of multi-step redox reaction.The film color turned from original green through orange to red in an oxidation process,and through dark blue to purplish in a reduction process.展开更多
1 Results Search for catalysts which can control the regio- and stereoselectivity for olefin polymerization is a very important research subject.For the polymerization of isoprene,we have recently achieved,for the fir...1 Results Search for catalysts which can control the regio- and stereoselectivity for olefin polymerization is a very important research subject.For the polymerization of isoprene,we have recently achieved,for the first time,the isospecific 3,4 polymerization by using a cationic rare earth metal alkyl catalyst bearing a silylene-linked cyclopentadieny-phosphido ligand[1], and the cis-1,4 living polymerization by a bis(phosphinophenyl)amido-ligated rare earth metal catalyst[2]. In addition to these ligan...展开更多
Proton resonant states in 22Mg have been investigated by the resonant elastic scattering of 21Na+p. The 21Na beam with a mean energy of 4.00 MeV/u was separated by the CNS radioactive ion beam separator(CRIB) and bomb...Proton resonant states in 22Mg have been investigated by the resonant elastic scattering of 21Na+p. The 21Na beam with a mean energy of 4.00 MeV/u was separated by the CNS radioactive ion beam separator(CRIB) and bombarded a thick(CH2)n target. The energy spectra of recoiled protons were measured at scattering angles of θcm ≈172° and 146°,respectively. A new state at 7.06 MeV has been observed clearly and another new one at 7.28 MeV is tentatively identified due to its low statistics. The proton resonant parameters were deduced from an R-matrix analysis of the differential cross section data. The astrophysical resonant reaction rate for the 18Ne(α,p)21Na reaction has been estimated,and it is about five times larger than that assumed before.展开更多
We generalize a theorem of Ky Fan about the nearest distance between a closed convex set D in a Banach space E and its image by a function f:D→E,in several directions:(1)for noncompact sets D.when f(D)precompact:(2)f...We generalize a theorem of Ky Fan about the nearest distance between a closed convex set D in a Banach space E and its image by a function f:D→E,in several directions:(1)for noncompact sets D.when f(D)precompact:(2)for compact D and upper semicontinuous multifunction f:and more generally,(3)for noncompact D and upper semicontinuous multifunction f with f(D)Hausdorff precompact. In particular,we prove a version of the fixed point theorem of Kakutani-Ky Fan for multifunctions. whose values are convex closed bounded,thus not necessarily compact.展开更多
文摘A sand sample collected at the foot of Flaming Mountain was studied further. On the basis of the change in the relative intensity after heat treatment, one of the sextets observed in its Mossbauer spectrum at liquid nitrogen temperature was ascribed to goethite. This result provides a useful information on the geological history of the region where the mountain is located.
基金Supported by the National Natural Science Foundation of China under Grant Nos.19705011 and 19635030the Chinese Academy of Sciences,and RIKEN Radiation Laboratory。
文摘The Excited states of ^(88)Sr have been produced in the reaction ^(16)O(^(82)Se,4p6n)and studied using the in-beam γ spectroscopy techniques.Two high-spin level structures have been observed and established up to 8.5 MeV and 7.9 MeV excitation energy,respectively.Based on the measurements of the directional correlations ofγ-rays de-exciting oriented states and anisotropic factors ofγ-rays,spin values of the excited states have been assigned up to the highest levels observed.
文摘A compact pulse radiolysis apparatus using a BNL-type s-band photocathode RF gun is now under development at Waseda University.The laser pulse is used for excitation of the photocathode and for generation of white light,which is used for analyzing light in the pulse radiolysis.
文摘Rare-earth metal diphthalocyanine complexes with R substituents,R_8Pc_2MH(where Pc=phthalocyanine;R=propoxy,t-butyl;M=Er,Lu),were prepared.Their films on basal plane pyrolytic graphite and on indium-tin oxide Ncsa glass electrodes in several aqueous electrolytes were investigated by voltammetric analysis and in situ electronic absorption spectroscopy at controlled potentials.These modified electrodes showed multi-color electrochromic behavior as a result of multi-step redox reaction.The film color turned from original green through orange to red in an oxidation process,and through dark blue to purplish in a reduction process.
文摘1 Results Search for catalysts which can control the regio- and stereoselectivity for olefin polymerization is a very important research subject.For the polymerization of isoprene,we have recently achieved,for the first time,the isospecific 3,4 polymerization by using a cationic rare earth metal alkyl catalyst bearing a silylene-linked cyclopentadieny-phosphido ligand[1], and the cis-1,4 living polymerization by a bis(phosphinophenyl)amido-ligated rare earth metal catalyst[2]. In addition to these ligan...
基金Japanese Ministry of Education, Culture,Sports,and Technology,Japan(13440071,14740156)Grants-in-Aids for JSPS,Japan(1604055)
文摘Proton resonant states in 22Mg have been investigated by the resonant elastic scattering of 21Na+p. The 21Na beam with a mean energy of 4.00 MeV/u was separated by the CNS radioactive ion beam separator(CRIB) and bombarded a thick(CH2)n target. The energy spectra of recoiled protons were measured at scattering angles of θcm ≈172° and 146°,respectively. A new state at 7.06 MeV has been observed clearly and another new one at 7.28 MeV is tentatively identified due to its low statistics. The proton resonant parameters were deduced from an R-matrix analysis of the differential cross section data. The astrophysical resonant reaction rate for the 18Ne(α,p)21Na reaction has been estimated,and it is about five times larger than that assumed before.
基金partially supported by the project"Geometrical functional analysis in Banach spaces:variational principles and global approximation"between Italy and Bulgaria
文摘We generalize a theorem of Ky Fan about the nearest distance between a closed convex set D in a Banach space E and its image by a function f:D→E,in several directions:(1)for noncompact sets D.when f(D)precompact:(2)for compact D and upper semicontinuous multifunction f:and more generally,(3)for noncompact D and upper semicontinuous multifunction f with f(D)Hausdorff precompact. In particular,we prove a version of the fixed point theorem of Kakutani-Ky Fan for multifunctions. whose values are convex closed bounded,thus not necessarily compact.
