最新刊期
      卷 0 ， 期 0 ， 2020
      • Issue 12, (1999)
        摘要：The yields of ionized argon atoms induced by 170MeV S~9+ ion impacts werestudied by using time-of-flight technique. The experimental yields of recoil Ar ionswere compared with the theoretical results of n-body classical trajectory MonteCarlo(nCTMC) method it was found that the nCTMC underestimated the yields ofhigher charge states of recoil ions.  
        关键词：Ion-atom collision;Multiple ionization;Recoil ion yield   
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        发布时间：2021-03-12
      • Issue 12, (1999)
        摘要：The irradiation conditions of the bremsstrahlung converted from 200MeVelectron beam at National Synchtrotyon Radiation Laboratory by tungsten converterwas studied through experimental method it was found that with 4.2-5.2mm-thicktungsten converter, the highest photonuclear reaction yields could be obtained, andthe yield decreased with increasing distance between the sample and the converterwhen the distance was less than 15cm. At present condition, the detedction limits ofC and F are 3.6 and 2.0ng respectively, when the samples are irradiated for 30minwhich is the normal injection time of NSRL.  
        关键词：Thickness of tungsten converter;Irradiated position;Photonuclearreaction yield;Photon activation analysis   
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        发布时间：2021-03-12
      • Issue 12, (1999)
        摘要：Magnetized water samples were measured by the positron annihilation lifetimespectrometer. The results showed that part of the K-shell electrons of oxygen atomsin water were forced closes to the nucleus by magnet field. The memory effect ofwater magnetization may be maintained by the stable 3-molecule group structure ofwater.  
        关键词：Water;Magnetization;Positron annihilation   
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        发布时间：2021-03-12
      • Issue 12, (1999)
        摘要：The principle and physical design of the time-of-flight mass spectrometerequipped in the energetic cluster impact deposition apparatus are introduced. Someproblems existed in experiments and their solutions are also discussed.  
        关键词：Time-of-flight;Energetic cluster impact deposition;Physical design   
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        发布时间：2021-03-12
      • Issue 12, (1999)
        摘要：Average ranges of recoil nuclides in the target materials induced by fast neutronreactions have been measured by the activation method. A systematic trend ofaverage range was found for (n,2n), (n, a ), (n,p) and (n,np) reactions. An empiricalformula was presented to describe the experimental results. Moreover, the calculatedresults based on theoretical formula were compared with the experimental results. Arevised formula was deduced from the present work.  
        关键词：Neutron sputtering;Recoil nuclide;Average range   
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        发布时间：2021-03-12
      • Issue 12, (1999)
        摘要：Backward error propagation logarithm of artificial neural network in XRFquantitative analysis of Pt-Pd alloy were presented in this paper. The results werecompared with least-square regression method. The technique of artificial neuralnetwork was proved more convenient and reliable.  
        关键词：Artificial neural network;Backward error propagation;Least squareregression   
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        发布时间：2021-03-12
      • Issue 12, (1999)
        摘要：Some experimental results measured in 30MeV/u~40Ar+~115In reaction, as well asthe energy calibration of a telescope, consisting of 30 u m Si+ 500 u m Si+ 4cmCsI(T1), were described in this paper. A reliable and useful method of the energycalibration of three - component telescope was presented.  
        关键词：Heavy ion reaction;Detector;Energy spectrum;Energy calibration   
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        发布时间：2021-03-12
      • Issue 12, (1999)
        摘要：The pressure melting process of phase change material (the ice) around ahorizontal cylinder with finite length was studied. Theoretical formulas of thethickness of liquid layer, the relationship between the melting velocity and exertedforce during the melting were obtained and discussed. After comparing with therelated results for the pressure melting around the long cylinder and T-drivenmelting around the short contact cylinder and the sphere, some useful conclusionswere derived  
        关键词：Melting;Phase change phenomena;Heat transfer   
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        <引用本文> <批量引用> 7199305 false
        发布时间：2021-03-12
      • Issue 12, (1999)
        摘要：The power supply system of No.1 6T superconducting wiggler in China wasintroduced. The system construction and features , circuit topology, quenchprotection, remote control, system commissioning and test result were described.  
        关键词：Wiggler power supply;Quench protection;Control system   
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        发布时间：2021-03-12
      • Issue 12, (1999)
        摘要：In order to discriminate isobar of heavy nuclei, a projectile X-ray detection(PXD) method has been developed. Some of the applacation works using the PXDmethod have been carried out.  
        关键词：Projectile X-ray;Analysis;Isobar   
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        <引用本文> <批量引用> 7199317 false
        发布时间：2021-03-12
      • Issue 12, (1999)
        摘要：Some indexes have been measured for a 4MeV electron linear accelerator used inindustrial flaw detection and compared with its design indexes.  
        关键词：Electron linear accelerator;Index;Measurement   
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        <引用本文> <批量引用> 7199196 false
        发布时间：2021-03-12
      • Issue 12, (1999)
        摘要：Mathematical-physical equations for the coment of crude oil in oil-water tankshave been proposed. Both hardware and software of the measurement system havebeen designed and successfully developed. Tests on an oil tank showed that themeasurement system could be operated safely, reliably and quickly, and the resultsprovided by the system agreed well with the traditional sampling method.  
        关键词：Emulsified layer;r-ray;Content of the oil   
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        发布时间：2021-03-12
      • Issue 12, (1999)
        摘要：The iron grade analysis instrument is used in fast measuring of iron content inore powder together with a small-scale oil pressure machine. Its accuracy iscomparable to the chemical analysis method. Except saving large amount of chemicalreagent and avoiding environmental pollution, as used in control of production, it canplay an important role in production of ore powder.  
        关键词：Iron grade;Fluorescence analysis   
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        <引用本文> <批量引用> 7199206 false
        发布时间：2021-03-12
      • Issue 12, (1999)
        摘要：By using monolithic X-ray lens, the direct beam intensity irradiating on crystalwas 1 to 2 order of magnitude higher than the traditional method with the doublefocusing mirrors. The diffracted X-ray intensity was increased by about 5 tAnes, andthe resolution was improved by 0.02 - 0.06nm . The signal to noise ratio was alsoimproved, and the time of measurement was reduced.  
        关键词：X-ray lens;X-ray diffraction;Macromolecular crystallography   
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        发布时间：2021-03-12
      • Issue 12, (1999)
        摘要：Six earthworm samples and Chinese human hair standard material(GBW 09101)were analyzed with INAA and ICP-MS in parallel for the element concentrations ofAs, Ba, Cd, Co, Cr, Cu, Fe, Mn, Hg, Rb, Sb, Se and Zn. A comparison of analyticalresults between INAA and ICP-MS was discussed. In general, a good agreementbetween two techniques was obtained, the relative deviations for most elements arewithin ±20%.  
        关键词：INAA;ICP-MS;Earthworm;Trace element   
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        发布时间：2021-03-12
      • Issue 12, (1999)
        摘要：Fluence rate distributions of neutrons emitted from intermediate energyreactions of 50MeV/u~12C-ion on thick Be, Cu and An targets have been measuredwith the threshold detectors. The neutron dose equivalent rate distributions in theheavy ion accelerator target area were obtained by using the conversion factors forneutron fluence rate to neutron dose equivalent rate.  
        关键词：Threshold detector;Heavy ion;Neutron;Dose equivalent rate   
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        发布时间：2021-03-12
      • Issue 12, (1999)
        摘要：The sensitive period was determined through buds germination inhibition using~60R-ray and electron beam converted X-ray at four irradiation dosages and fourirradiation interval in four species of garlic. The results indicated that the garlicbuds germination, at dormant period by irradiation of either r-ray or X-ray at40Gy, could be inhibited, and the critical period for inhibiting buds germination were15th, Sep. for Jiangsu Taicang, 22th, Aug. for Henan Zhengzhou and ShandongJinxiang, 15th, Aug. for Jiangsu Pizhou respectively.  
        关键词：Irradiated garlic;Buds germination inhibition;Critical period   
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        发布时间：2021-03-12
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