最新刊期
      卷 0 ， 期 0 ， 2020
      • Issue 8, (1999)
        摘要：In order to study energetic ion range and depth profile in biological samples,transmission spectra of F ions through kidney beau coat samples and onion innersurface membrane samples have been measured with a silicon surface detector. Theion beam energy ranged from 900keV to 6MeV at a low dose rate of about 104ions/s’cm2; SEM experiment was carried out to observe sample’s topography after ionirradiation. The spectra were simulated by using computer software SINRA. Theinfluence of biological sample’s special structure and composition on ion space rangeand depth profile was discussed.  
        关键词：Ion implantation;Biological effect;Transmission measurement   
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        发布时间：2021-03-12
      • Issue 8, (1999)
        摘要：A comparative study of irradiation effects of N+ ion beam and γ-rays onTobacco Calli was carried out by analyzing the changes of yields and contents of O2,Hood and MDA, as well as the activities of SOD, POD and CAT. The results showedthat the quantum yields of O:, H2ZO2 and MDA in Tobacco Calli irradiated with N+ion beam and y "rays were increaced, and they were intensified with the irradiationdoses. The activities of SOD, POD and CAT were increased in the situation of D= (1- 3) × 1015N+/cm2 and D= 135-180Gy γ -rays while they were decreased in situationof D= (3- 6)× 1015N+ /cm2 and D= 180- 315Gy γ-rays. The characteristics ofirradiation with N+ ion beam were also discussed.  
        关键词：N~+ ion beam;60~Co γ-rays;Irradiation;Tobacco Calli;Lipidperoxidation;Regulatable enzyme   
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        发布时间：2021-03-12
      • Issue 8, (1999)
        摘要：The a -Fe2O3-SnO2 and a -Fe2O3-SnO2-Y2O3 materials were synthesized byusing chemical coprecipitation method. Microstructure and grain growth of thesematerials were investigated by X-ray diffraction (XRD) and 57Fe Mdssbauerspectroscopy. The experimental results show that Y2O3-dopping may restrain thegrowth of grains, and the size of the nanocrystalline a -Fe2O3-SnO2Y2O3 dependson the sintering temperature.  
        关键词：Mossbauer parameters;X-ray diffraction;Y2O3;Iron tin compositeoxide   
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        发布时间：2021-03-12
      • Issue 8, (1999)
        摘要：The thermodynamic process of 57Fe+ and N2+ ions coimplantion in Cu wasstudied by CEMS. The Fe nitride with NaCl structure was found. The bulk diffusiontemperature of a -Fe in Cu was influenced by N, the nitrogen can play a role intrapping and futher stabilizing a new a phase of the dissociated iron.  
        关键词：Ion implantation;Iron nitride;Bulk diffusion temperature of a -Fe;CEMS   
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        发布时间：2021-03-12
      • Issue 8, (1999)
        摘要：This formation of micro-second pulse current and the theory of Rogowski coilare briefly described. The structure of measuring system and the result ofmeasurement are presented in this paper. It is shown that the application ofresonance convert power as charger and thyratron as main switch of circuit makethe pulse generator have many good properties.  
        关键词：Pulse generator;Micro-second pulse current;Rogowski coil   
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        发布时间：2021-03-12
      • Issue 8, (1999)
        摘要：In electronic storage ring, the bending magnet field error, rotational error andthe quadrupole displacement error produce dipole field, which will induce the closed orbit distortion (COD) of cycle electrons. Different corrector and BPM placementschemes were compased and studied, it is found that the scheme with 10 BPM (BPMclose to the sextupole ) and 4 horizontal and 4 vertical correctors in each cell isacceptable, and the COD Rms. could be suppressed to be under 0.1mm. The effect ofthe bending magnet field error, rotational error and the quadrupole displacementerror to the COD and how the BPM reading error and correctors error influenced thecorrection result were studied. Through COD correction the dynamic aperture couldbe resumed to be above 75% of the ideal dynamic aperture.  
        关键词：Field error;Alignment error;Closed orbit distortion correction;Dynamicaperture;Electronic storage ring   
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        发布时间：2021-03-12
      • Issue 8, (1999)
        摘要：The characteristics of scintillation fiber BCF-12 and the beam diagnosis unitsusing BCF-12 fibers and PMT for reading out was introduced. Emphasis was laid ondescribing its structure, character and applications in the radioactive ion beam linein Lanzhou (RIBLL).  
        关键词：Scintillation fiber;Beam diagnosis;Radioactive ion beam line   
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        <引用本文> <批量引用> 7201671 false
        发布时间：2021-03-12
      • Issue 8, (1999)
        摘要：A numerical simulation method of DC plasma torch is described in this paper.The temperature, velocity, currency density distribution on different boundarycondition of plasma torch are obtained by resolving the energy, momentum, massconservation equations of arc column. The temperature, potential, currencydistribution of the atmosphere were calculated, 200A free burning argon arc and theresults are consistent with the experiment data and other theoretical results. On thebasis of this, the numerical simulation in the arc column of the 5000A high powerplasma torch with the presence of cathode nozzle was discussed. The influence of theradiation factor, Joule heating factor in the energy conservation equation wereconsidered also. The relation between the maximum temperature and the length ofarc is also discussed.  
        关键词：Plasma torch;Free burning argon arc;Conservation equations   
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        发布时间：2021-03-12
      • Issue 8, (1999)
        摘要：Using external proton beam induced X-ray emission (PIXE) technique, theelemental concentrations in the structures of connective tissue corelated to acupointswere determined. Experiments show that elements Ca, P, K, Zn, etc are abundantlypresented at the location corresponding to acupoints  
        关键词：Meridians;Acupoints;Connective tissues;PIXE   
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        发布时间：2021-03-12
      • Issue 8, (1999)
        摘要：A procedure used to determine 90Sr content in 89Sr product was developed.According to the decay principle, 90Sr maintains long term equilibrium with daughtercoy. So, 90Sr content can be determined through 90Y determination. Paperchromatography was used to separate yttrium from stronium, accurate determinationsof 89Sr content and 90Y content were obtained on the basis of half-life measuringmethod. At last, 90Sr content was determined. The procedure is effective, simple andconvenient.  
        关键词：(90)~Y;(90)~Sr;(89)~Sr;Half-life;Paper chromatography   
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        发布时间：2021-03-12
      • Issue 8, (1999)
        摘要：15Nb-tryptamine was synthesized starting from [a -15N] glycine via 7 steps. Theyield of 15Nb-tryptamine from [a -15N] glycine was 45%. [2-15N] perlolyrine wassynthesized from 15Nb-tryptamine via 3 steps, the yield of [2-15N] perlolyrine from15Nb-tryptamine was 22.2%. The 15N abundance of [2-15N] perlolyrine was morethan 90%. The synthetic showed that the synthetic compounds were suitable for thestuding of drug metabolism.  
        关键词：15Nb-tryptamine;[2-15N]perlolyrine;Synthesis   
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        <引用本文> <批量引用> 7201577 false
        发布时间：2021-03-12
      • Issue 8, (1999)
        摘要：Response of PMOS dosimeter to total dose has been studied under ionizingradiation with 60Co γ-rays. The results showed that there was an obviousdependence of △ VT on dose rate. By means of I- V subthreshold curve measurementthe contribution of irradiation induced interface state positive charge to the dose rateeffects was found and the relationship of total threshold voltage shift △ VT and dosewas KDn. The power n decreased with increasing dose rate.  
        关键词：PMOS;Response of threshold;60Co γ-rays irradiation;Dose rate   
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        发布时间：2021-03-12
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