最新刊期
      卷 0 ， 期 0 ， 2020
      • Issue 2, (1995)
        摘要：The positron lifetime has been measured as a function of doped Pb content in（Bi2-xPbx）Ca2.5Nd0.5Cu2O8+y.superconductors.It was found that positron lifetime decreased with the increase of Pb content in 2212 phase.It is believed that Pb substitutes for Bi,which makes some electrons transfer from Cu-O planes or other sites to Bi-O layers,increases the electron density at Bi-O layers and causes Tc to rise.  
        关键词：Superconductors;Positron lifetime   
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        发布时间：2021-04-09
      • Issue 2, (1995)
        摘要：The phenomena of nuclear fusion at room temperature have been studied using a gas discharge facility and about 104 neutrons per second have been detected.The neutron yield is controllable and reproduceable.The BF3 neutron detectors,the 6Li thermoluminescence films,the NE-213 organic liquid scintillation neutron spectrometer and the n-γ discrimination technique were used to diagnose the neutrons.It was confirmed that neutrons were emitted from the gas discharge facility.  
        关键词：Neutrons;Gas discharge;10B(n;α)7 Li reaction;n-γ discrimination spectra;Neutron energy spectra;Thermal neutrons   
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        发布时间：2021-04-09
      • Issue 2, (1995)
        摘要：The formation of the complex optimum surface layer on H13 steel by C,V and V+C dual implantation has been studied. The fine crystal grains and new phases in steel were observed by TEM.Both grain boundary and dislocation strengthening was enhanced. It was found from the Auger analysis that the concentrations of C and V were 50% and 30% respectively,and therefore the solid solution strengthening appeared.It was seen from X-ray diffractions that the dispersion strengthening phases Fe2C,Fe5C2 FeV and V2C were formed.The diffraction peaks of these phases were increasing after annealing,indicating that the phases were growing.Hardness and wear resistance of the implanted layers were greatly increased because of the formation of these phases,especially V2C.The amorphous layers were also observed by TEM.  
        关键词：Pulse;Dual ion implantation;H13 steel;Wear resistance   
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        发布时间：2021-04-09
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