最新刊期
      卷 0 ， 期 0 ， 2020
      • Issue 2, (1996)
        摘要：The stable isotopes of oxygen and carbon were determined for stalagmite samples born Choukoutien Cave and the corresponding paleotemperstere was derived.Then the stalagmites age was determined by the U series dating.The general law of paleotemperature change in north China was thus obtained for the duration of 15×104 years.  
        关键词：U series dating;Hybrogen isotope;Oxygen isotope;Paleotemperature determination   
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        发布时间：2021-04-09
      • Issue 2, (1996)
        摘要：The effect of hydrogen on the irradiation behaviour of oboe dispersion Strengthened（ODS） ferritc steel has been studied by means of inn implantation at room temperature and in-situ observation with a low-voltage electron microscope.The microstructure of ODS ferritic steel before and ther hydrogen-ion implantation is not changed st room temperature,but changed obviously as the temperature robes tO 550℃,with the occurrence of precipitstion of chromium carbide.  
        关键词：ODS ferritic steel;Hydrogen-ion implantation;Irradiation-induced precipitation   
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        发布时间：2021-04-09
      • Issue 2, (1996)
        摘要：In this paper proposed was a new filtering algorithm for noisy image.The most homogeneous neighborhood area around each point in an image was looked for using the minimum variance technique,and then each point was given the average.gray level of the selected neighborhood area.An experiment upon a noisy image with many kinds of noise was carried out.The result demonstrated that noises were removed well and the image edges were enhanced without blueing sharp edges nor destroying the details of a region.  
        关键词：Noisy image;Image filtering;Minimum variance;Most homogeneous neighborhood   
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        <引用本文> <批量引用> 8413019 false
        发布时间：2021-04-09
      • Issue 2, (1996)
        摘要：The time and energy resolutions of the ring-parallel plate avalanche detector for ThC’a source and 252Cf spontaneous fission source were 370ps and 35% respectively.The detector was used to the correlation measurement between the interme diate-mass-fragmention,and the projectile-likes and the evaporation-residues in 40Ar （26MeV/u）+ 159Tb and nat Ag reactions.In the experiment,the scattersing angles covered were from 7°to 12°.The projectile-lilies and the evaporation-residues were found to be separated well in the two-dimension spectrum of energy loss vs time of flight,in spite of the poor energy-loss resolution.  
        关键词：Projectile-likes;Evaporation-residues;Ring-parallel plate avalanche detector;Time and energy resolution   
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        <引用本文> <批量引用> 8413031 false
        发布时间：2021-04-09
      • Issue 2, (1996)
        摘要：An in-beam Mossbauer setup recently established at the HIRFL is described.The in-beam Mossbauer technique is also discussed in detail.  
        关键词：In-beam M ssbauer spectroscopy;Coulomb excitation and recoil implantation   
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        <引用本文> <批量引用> 8413048 false
        发布时间：2021-04-09
      • Issue 2, (1996)
        摘要：The applied condition and the.determination of relsted parameters for the inner-standard method in instrumental neutron activation analysis of geologic samples are discussed.It is shown that the inner-standard method can be used as an important supplement of the relative comparative method used in neutron activation analysis.  
        关键词：Neutron activation analysis;Inner-standard method;Ore determination   
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        <引用本文> <批量引用> 8413063 false
        发布时间：2021-04-09
      • Issue 2, (1996)
        摘要：The thermoluminescence（TL） and electron spin resonance（ESR） characteristics of anhydrous magnesium sulphate powder irradiated with 60Co γ-rays have been investigated.TL glow curves are deconvoluted by the general order kinetics equation into three elementary peaks,then the trap parameters are obtained for each peak by fitting and calculation with method of different heating rates.ESR spectra are me’asured at room temperature and -150℃,and isochronal annealing characteristics for irradiated MgSO4 samples has been investigated.The experimental data of TL and ESR dose-responses are fitted with a dose response function to get their nonlinear characteristic parameters,from which it is shown that TL dose-responses for three glow peaks are superlinear,while ESR dose-response for peak f （g=2.0037） appears sublinear and that for peak g（g=1.9976） remains linear at dose level up to 20 kGy.  
        关键词：Thermoluminescence;Electron spin resonance;Dose response;Trap parameters   
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        <引用本文> <批量引用> 8413072 false
        发布时间：2021-04-09
      • Issue 2, (1996)
        摘要：A side extraction PIG ion source with permanent magnet for extracting negative ions,such as H-,O-,F-,etc.is introduced.At 15kV extraction voltage,O-beam of 130 μ A and F- beam of 75 μ A are obtained,and the discharge power consumption is 110 and 280W respectively.  
        关键词：PIG ion source;Side extraction;Permaneat magnet;Negative ion   
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        <引用本文> <批量引用> 8413084 false
        发布时间：2021-04-09
      • Issue 2, (1996)
        摘要：The self-burial Process of symmetric and rotary heat sources in the gravity field during melting their way through the surroundings is studied.The general formulas are presented.As an example,the problem of contact melting around a horizontal cylinder and sphere is solved respectively,and the validity of the formulas is proved.  
        关键词：Contact melting;Heat transfer;Nuclear waste disposal   
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        <引用本文> <批量引用> 8413094 false
        发布时间：2021-04-09
      • Issue 2, (1996)
        摘要：The possibility of forming carbon nitride CNx by high dose nitrogen implantation into carbon film has been investigated.The sample is evaluated by Fourier transformation infrared absorption spectroscopy（FTIR）,X-ray photoelectron spectroscopy（XPS）,X-ray diffraction analysis（XRD） and Vickers microhardness measurement.The results verify the formation of C-N covalent bond in the sample during the process of high dose nitrogen implantation into carbon film.  
        关键词：Ion implantation;Carbon nitride;Fourier transformation infrared absorption spectroscopy;X-ray photoelectron spectyoscopy   
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        <引用本文> <批量引用> 8413102 false
        发布时间：2021-04-09
      • Issue 2, (1996)
        摘要：A plastic scintillator nuclear weighing-scale has been develOPed.In this paper the woring principle,strieture,main performmace and characteristics of the nuclear weigh-scale are described.Combaning nuclear detection technology with microcomputer,the non-contacting instrument features good accuracy,high reliability,simple installation and maintenance,and can therefore be used for on-line measurement and control of the cargoes on conveying machines.  
        关键词：Plastic scintillator;Nuclear weigh scale   
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        <引用本文> <批量引用> 8413117 false
        发布时间：2021-04-09
      • Issue 2, (1996)
        摘要：The effect of 110keV nitrogen ion implantation on hardness,fracture toughness and residual stress of the single crystal alumina has been investigated.It is shown that,ocrphardness increases by 92% for a fluence of 1×1017N+/cm2 and fracture toughness increases by 95% for a fluence of 3×1017N+/cm2.  
        关键词：Ion implantation;Al2O3;Surface modification   
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        发布时间：2021-04-09
      • Issue 2, (1996)
        摘要：The magnetostriction and magnetic anisotropy of a FeCuNbMoSiB alloy sample have been simultaneously studied from its Mossbauer spectrum in radio frequency field. The appropriately annealed nanocrystalline alloy with a crystallinity of about 60% and the average diameter of microcrystalline grain in the range of 10-20urn is found to have optimum soft magnetic performance,i.e.its magnetostriction coefficient is descended to zero and magnetic anisotropy comes to minimum simultaneously.In contrast to this,if an amorphous sample is annealed not enough or excessively,the fine soft magnetic performance will be lost because both the above-mentioned conditions can not be realized simultaneously.  
        关键词：Radio frequency field;Amorphous alloy;Nanocrystalline alloy;M ssbauer effect   
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        <引用本文> <批量引用> 8413145 false
        发布时间：2021-04-09
      • Issue 2, (1996)
        摘要：A string of declining oscillation can be provided from a Gaussion filter under excitstion by a super-short（ns/ps） pulse.Therefore the signal-processing becomes easy because the period of the oscillation is much longer than that of the pulse.Design of the Gaussion filter as well as its application in BPM of super-short pulses are described in this paper.  
        关键词：Gaussion response filter;Super-short pulse;Beam position monitor   
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        <引用本文> <批量引用> 8413158 false
        发布时间：2021-04-09
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