最新刊期
      卷 0 ， 期 0 ， 2020
      • Issue 3, (1999)
        摘要：The extraction mechanism of uranium（VI） with N,N- dibutyloctylamide（DBOA） in kerosene has been studied.The influences of concentrations of aqueous nitric acid,salting-out agent LiNO3 and extractant on the extraction distribution ratios are investigated.The structure of the extracted complex is analyzed by the aid of IR spectra. While there exists synergism for the extraction of uranium（VI） with TBP and DBOA at lower TBP concentration,the antagonistic effect occurs at higher TBP concentration.However,the IR spectra indicate that there is no interaction between these two extractants.The complicated effect caused by TBP may be due to the change in polarity of organic phase with the increase of TBP concentration.The stoichiometry of the complex formed with TBP and DBOA was determined by the slope method.  
        关键词：N,N-dibutyloctylamide;Uranium(VI);TBP;Solvent extraction   
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        发布时间：2021-03-12
      • Issue 3, (1999)
        摘要：The binding of REE with water-soluble polysaccharides (PSs) in leaves of fern Dicranopteris Dichotoma (DD) has been studied by molecular activation analysis.The cold-water-soluble and hot-water-soluble PSs in leaves of DD were obtained by using biochemical separation techniques. The PSs of non-deproteinization and deproteinization, were separated on Sephadex G-200 gel permeation chromatography.The absorption curves of elution for the PSs were obtained by colorimetry, and the proteins were detected using Coomassic brilliant G-250. Eight REEs (La, Ce, Nd, Sm,Eu, Tb, Yb and Lu) in these PSs were determined by instrumental neutron activation analysis. The results obtained show that the REEs are bound firmly with the water-soluble PSs in the plant. A measurement demonstrates that the PSs bound with REEs are mainly of smaller molecular weight (10,000 to 20,000 Dalton).  
        关键词：Rare earth elements;Water-soluble polysaccharides;Molecular activation analysis   
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        发布时间：2021-03-12
      • Issue 3, (1999)
        摘要：An electric control system for target replacement in the ion source is described.Two stepping motors are controled by a single chip processor.The paralleled signals in high potential of tens of thousand volts are transformed to series signals and communicated with the main instruments located on the ground potential.The stepping motors are driven by a double power supply system and an annular adapter is used.  
        关键词：Single chip processor;Photoelectric coupler with optic-fiber bundle;Power supply with high and low voltage;Annular adapter   
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        发布时间：2021-03-12
      • Issue 3, (1999)
        摘要：The mechanism of extracting uranium(VI) with sulfoxides such as petroleum sulfoxide(PSO) and 2-ethylhexyltolyl sulfoxide (EHTSO) from nitric acid solution has been studied. The influences of the concentrations of nitric acid, extractant,salting-out agent and complex anion as well as temperature on the distribution ratio were observed. Enthalpy of the extraction reaction was obtained.  
        关键词：Sulfoxides;Extraction;Uranium   
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        <引用本文> <批量引用> 7392049 false
        发布时间：2021-03-12
      • Issue 3, (1999)
        摘要：The testing method and results of the system functions and metrological properties for microcomputer-based nuclear metrological system KD-418IV on the basis of the“National Rules of Metrology Verification of P.R.C (JJG811-93, for Nuclear Conveyor Belt Scale)”are presented in this paper.  
        关键词：Nuclear metroloical system;Metrology verification;Radiation safety   
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        发布时间：2021-03-12
      • Issue 3, (1999)
        摘要：The fundamental principle of a two-dimensional position-sensitive detector based on microchannel plate is presented. The resistive anode plate and data read-out system of the detector were designed. Satisfactory anode linearity and position resolution were obtained.  
        关键词：Micro-channel plate (MCP);Resistive anode plate   
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        发布时间：2021-03-12
      • Issue 3, (1999)
        摘要：The isothermal oxidation behavior in air environment at 900℃ for Nb~+ implanted Ti-48at% Al alloy treated by different post-implantation annealing was investigated.The influence of annealing upon the distribution of Nb and the oxide surface morphology were analyzed by AES and SEM respectively.The experimental results exhibited that the proper post-implantation annealing could further improve the oxidation resistance of the implanted specimens,and this effect was probably due to the diminishing of lattice damages induced by ion implantation and the redistribution of the implanted and matrix elements.  
        关键词：γ-TiAl based alloy;Ion implantation;High temperature oxidation;Annealing treatment   
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        发布时间：2021-03-12
      • Issue 3, (1999)
        摘要：The surfaces of InP were investigated with XPS before and after irradiation by soft X-rays from a synchrotron radiation source.The experimental results indicate that the radiation damage on the surface of InP is related to the energy and dosage of the soft X-rays, particularly the radiation effect caused by X-rays with energies near the resonant absorption energy of K-shell for P atoms is different from that caused by other X-rays. A qualitative explanation for the results is given.  
        关键词：InP;Soft X-rays;Damage   
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        <引用本文> <批量引用> 7392408 false
        发布时间：2021-03-12
      • Issue 3, (1999)
        摘要：The transmission electron microscopy and energy spectrum techniques were used to determine the morphology, structure, composition and chemical states of elements in the IBAD MoS2-Ta composite film. A partial crystallization in the deposition process of the film and a special morphology of two sharp contrary phase areas decorated by the white granule were observed and the white granule was identified as the second phase TaS2 by a combination of TEM with XPS. Two parts of the film all have （002）,（100） and （110） orientations with larger d-spacings and lattice parameters, and the above parameters of the white area are larger than those of the film matrix. The experiments of immersion in deionized water and of oxidation at high temperature indicate that resistances of the film to hydrolysis and oxidation are obviously superior to those of the MoS2 film deposited in the same condition.  
        关键词：Ion beam assisted deposition(IBAD);MoS2-Ta film;MoS2 film;Immersion;Oxidation   
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        发布时间：2021-03-12
      • Issue 3, (1999)
        摘要：Dose distribution in water is calculated for normal incidence of proton beams.The depth-dose relation of broad beams is presented, and a 3-D dose distribution with a radial Gaussian representing multiple scattering of pencil beams is then obtained. A series form of dose off-axis-ratio(OAR) for cylindrical homogeneous beams is finally presented.  
        关键词：Proton;Dose distribution;Multiple scattering;Off-axis-ratio   
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        发布时间：2021-03-12
      • Issue 3, (1999)
        摘要：The principle and construction of magnetic pole gap adjusting system of transverse optical klystron dispersive section based on PC is described in this paper.The adjusting system has been applied in the storage ring free electron laser experiments operated at NSRL. It is proved that the system works well and the adjusting accuracy is up to 10~-3mm.  
        关键词：Storage ring free electron laser;Transverse optical klystron;Close loop control   
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        <引用本文> <批量引用> 7391967 false
        发布时间：2021-03-12
      • Issue 3, (1999)
        摘要：The communication between the ground computer and the pulsed neutron multi-parameter spectrum instrument in well logging, i.e. Atlas-Dress 3700-2727 C/O well logging instrument, is studied. A data acquisition system based on the microprocessor 80C196 is designed. The 80C196 can encode as well as decode the Manchester code by means of software. Furthermore, the system has a diagnostic function for checking the transmission performance.  
        关键词：Carbon/oxygen well logging;Data acquisition;Manchester code   
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        <引用本文> <批量引用> 7392227 false
        发布时间：2021-03-12
      • Issue 3, (1999)
        摘要：Suzhou River sediment samples in Shanghai area were measured for total a and β radioactivity by a low background a and β measuring instrument. The data obtained in this work were similar to those for soil samples in Shanghai district. The method was checked by the standard radioactive powder sources of pure uranium and potassium-40. The experimental values were found in good agreement with the certified ones.  
        关键词：Radioactivity measurement;River sediment;Total α radioactivity;Total β radioactivity   
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        发布时间：2021-03-12
      • Issue 3, (1999)
        摘要：The measurement results of intrinsic flood field uniformity and maximum count rate were analysed and compared among the four different manufacturers’ SPECTs.It was found that the descriptions mentioned above were different from those stated by manufacturers and some were of significant difference.  
        关键词：Single photon emission computerized tomography (SPECT);Quality control   
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        <引用本文> <批量引用> 7391988 false
        发布时间：2021-03-12
      • Issue 3, (1999)
        摘要：经中国核学会和中国科学院上海原子核研究所同意，决定在《核技术》和《ＮｕｃｌｅａｒＳｃｉｅｎｃｅａｎｄＴｅｃｈｎｉｑｕｅｓ》（ＮＳＴ）两刊物设立“王淦昌优秀核科学和核技术论文奖”专项奖。“王淦昌优秀核科学和核技术论文奖”每两年评选一次，具体细则如下：第...  
          
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        发布时间：2021-03-12
      • Issue 3, (1999)
        摘要：The relations between the survival and dose of D.radiodurans and E.coli by N~+ ion implantation were investigated. Two curves of survival all take a "saddle shape"with increasing N~+ ion implanted doses, and these are essentially different from the results of UV and γ-ray irradiation. Since the existing theory can not explain this"saddle shape" curve, a possible and reasonable explanation is put forward, based on the energy and momentum deposition effect for lower doses and the charge stimulating effect for higher doses.  
        关键词：Ion implantation;Microorganism;Survival-dose relation;Biologicaleffects   
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        发布时间：2021-03-12
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