最新刊期
      卷 0 ， 期 0 ， 2020
      • WU Wenquan1 LI Wei2 LI Wenjie1 GUAN Yong1 YANG Yunhao1 CHEN Jie1 ZHOU Jie1 YU Xiyue1 SONG Xiangxia1 TIAN Yangchao1 CHEN chusheng2 1
        Vol. 33, Issue 4, (2010)
        摘要：The porous structure of ceramic materials has a great impact on their performance. However, the existing characterization techniques fail to give 3D structure of the ceramics. In this work, nano-CT imaging technique was used to study 3D structure of a ceramic fiber tube prepared by a phase inversion technology. The results showed the shape, direction, size distribution, and 3D map of the pores inside the ceramic wall. The pore size is 0.4–1.5 μm, with a porosity of 38.31%. The data can be used to improve their preparation processes and optimize the structure parameters, for applications in chemical, energy, environmental protection and other fields.  
        关键词：Porous ceramics;Three-dimensional structure;Nano-CT;Porosity;YSZ-LSM   
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        发布时间：2021-03-05
      • WANG Lihua1 DUAN Huiping2 ZHU Jian1 YAN Yan3 XIE Yaning4 WANG Changsui1 1
        Vol. 33, Issue 4, (2010)
        摘要：Structure analysis of Honglvcai, an overglaze ploychrome porcelain produced in China from the Song Dynasty to Ming Dynasty, has been a blank in studies on ancient Chinese ceramics. This work was focused on the oxidation state and local environment of colorants in red, yellow and green decorations on Honglvcai by X-ray absorption fine structure (XAFS). The analysis of Fe K-edge XANES and EXAFS spectra of the red-colored samples indicated that Fe3+ was mainly located at a distorted octahedral site in a hematite phase, while that if the yellow-colored samples showed that iron was present as both trivalent and divalent cations coordinated with oxygen atoms in an amorphous phase. And Cu K-edge XAFS analysis of the green-colored samples revealed that Cu2+ was the main constituent coordinated with oxygen atoms in an amorphous phase.  
        关键词：Honglvcai;X-ray absorption fine structure;Oxidation state;Local structure   
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        发布时间：2021-03-05
      • WEI Guohai1 LIU Xiangfeng2 LI Tianfu1 ZHANG Li1 WANG Yu1 WANG Hongli1 1
        Vol. 33, Issue 4, (2010)
        摘要：Small angle neutron scattering (SANS) technique is a powerful tool for nanometer structural analysis of materials. The process of SANS measurement, and the raw data reduction, is relatively complicated. In order to obtain the absolute SANS intensity, one needs to measure intensities of the incident and scattered beams, the sample transmission, the background, the scattering and transmission of the empty cell etc. If a wide scattering vector range is needed, one has to measure the same sample under different instrument configurations. Also, a large number of data treatments are needed before one obtains the SANS data for further analysis. In this paper, after a short introduction to the SANS basic theory and the experimental system, we focus on the raw data reduction method, in which the averaging and the combination of the isotropically scattered data are discussed in detail.  
        关键词：Small angle neutron scattering;Experiment measurement;Raw data reduction   
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        发布时间：2021-03-05
      • SONG Chunli YAN Rui GUO Zhi TAI Renzhong
        Vol. 33, Issue 4, (2010)
        摘要：A number of experiments have proved that polarization clusters exists in BaTiO3 and excellent properties of BaTiO3 are related to a great extent with spatiotemporal information of polarzition clusters. The measurement of temporal state is essential to discuss the characteristics of the polarization clusters and to recognize the nature of the ferroelectric phase transition. In our experiment, the 300 nm long range polarization clusters in BaTiO3 were found to be dynamic with characteristic relaxation time (τc) of several microseconds by Photon Correlation Spectroscopy (PCS). The evolution details of the relaxation time were also revealed clearly in the vicinity of TC. It has proved that PCS is an effective method for the probing of dynamic process among ferroelectrics.  
        关键词：Ferroelectrics;PCS;Polarization cluster;Relaxation time   
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        发布时间：2021-03-05
      • LIU Jinghua1 TIAN Gang2 WANG Zhuwen1 DING Yang1 WANG Bangbing2 1
        Vol. 33, Issue 4, (2010)
        摘要：Gamma spectra of 238U, 232Th and 40K were measured at the Liangzhu archaic rampart in selected grid of spots on the east, north and west city wall and nearby areas, in an attempt to determine layout of the city walls by analyzing features of the radionuclide content distribution and the total counts of 0.5–3 MeV γ-rays. It was found that the location, width and content variations tendency of the 238U, 232Th and 40K contents were basically in accordance with archaeological findings of the rampart. The abnormal content distributions on different walls were inhomogeneous. In a better protected part of the archaic rampart, the radioactivity anomaly was more obvious, hence a clearer indication of the wall layout, such as the east wall), whereas it is not the case for the west wall, which is badly protected. By suitable data processing to enhance the weak anomaly, however, the method of γ-ray spectroscopy can be used for archaic rampart detection.  
        关键词：Liangzhu archaic rampart;γ-ray spectral measurements;Radioactivity anomaly characteristics;Abnormal content distributions   
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        发布时间：2021-03-05
      • SONG Jianming HUANG Chaoqiang LIU Lijuan YANG Jian CHEN Bo
        Vol. 33, Issue 4, (2010)
        摘要：According to layout of a triple-axis spectrometer (TAS), neutron beam parameters at the sample position, such as the homogeneity, divergence and flux, were calculated by Monte-Carlo simulation. The results show that using a double-focusing monochromator, the beam flux is 1.54 times larger, but the neutron distribution is worse, than using a flat monochromator, while the vertical maximum divergence increases to 4°. Vertical divergence of the neutrons decreases with increasing focusing lengths, while the beam homogeneity does not change obviously. A pyrolytic graphite (PG) filter is suitable for neutrons in wavelengths of less than 0.4 nm, while a Be filter is better than PG filter for neutrons in wavelengths of longer than 0.4 nm.  
        关键词：Neutron triple-axis spectrometer;Monte-Carlo simulation;Parameter optimization   
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        发布时间：2021-03-05
      • FEI Wuxiong1,3 LU Wu1,2 REN Diyuan1,2 ZHENG Yuzhan1,3 WANG Yiyuan1,3 CHEN Rui1,3 WANG Zhikuang4 YANG Yonghui4 LI Maoshun1,3 LAN Bo1,3 CUI Jiangwei1,3 ZHAO Yun1,3 1
        Vol. 33, Issue 4, (2010)
        摘要：At low dose rate, ionizing radiation response of NPN bipolar transistors at different base-emitter junction bias, i.e, negative bias, positive bias and zero bias, was investigated in this paper. Under low dose rate irradiation of up to 1 kGy by 60Co γ-rays, the NPN bipolar transistors at different bias behaved differently. An NPN bipolar transistor in irradiation with negative biased at the base-emitter junction, the excess base current and gain degradation were much larger than those of the other two bias situations, and the excess base current and gain degradation were minimal when the base-emitter junction was positively biased. Possible mechanism was discussed.  
        关键词：Bipolar transistor;Low dose rate;Bias;60Co γ-irradiation   
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        发布时间：2021-03-05
      • HUO Heyong TANG Bin WU Yang LIU Bin
        Vol. 33, Issue 4, (2010)
        摘要：The main influence factors of thermal neutron radiography include collimation ratio, cadmium ratio, scattering neutron, spatial distribution of neutron flux and so on. In this paper, the influence factors on thermal neutron imaging quality are analyzed by Monte Carlo simulation, and relevant measures are proposed for quality improvement of the thermal neutron imaging technique.  
        关键词：Thermal neutron radiography;Influence factors;Monte Carlo simulation;Analysis   
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        发布时间：2021-03-05
      • XUE Lingui1 ZHAO Xu1 CHANG Sijing1 ZHANG Hong2 WU Zhenhua2 JIN Chun’e1 1
        Vol. 33, Issue 4, (2010)
        摘要：The PHB-producing strain of Bacillus P-9 was irradiated by 80 MeV/u 12C6+ ion beams to increase PHB production. The results indicated that the best radiation dose is 15 Gy. One strain mutagenized the 12C6+ ion beams, called G15, has the highest PHB production yield, showing final PHB concentration of 2.93 g/L, 1.5 times higher than that of original strain. The breeding effect of heavy-ion irradiation mutation is remarkable, and has a broad application prospect.  
        关键词：Poly-β-hydroxybutyrate;Heavy ion;Nutagenesis;High yielding strain   
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        发布时间：2021-03-05
      • KANG Houjun1 ZHANG Dong1 YANG Yong1 LI Kuanliang2 ZHANG Peicong2 SHI Zhengkun1 1
        Vol. 33, Issue 4, (2010)
        摘要：In this work, adsorption and migration of 238U and 90Sr in unsaturated soil at a VLLW (very low level waste) site was investigated, in an attempt to find geochemical features of the site. Migration of the isotopes in heterosphere was studied under instantaneous and sequential conditions of the sources. The migration barrier experiment was carried out in two steps on wall rock absorption of the isotopes and addictives to improve the barrier of the wall rock to 90Sr. The results show that the migration speed of 238U and 90Sr in the soil is 0.365 and 0.385 mm/a, respectively. The heterosphere effects on the isotope migration not only alleviated the mainstream contamination, but also prolonged the time of contaminated affection. And false zeolite should be used as barrier additive material for 90Sr migration.  
        关键词：Very low-level radioactive waste;Buried field;Choose site;U;Sr;Migration   
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        发布时间：2021-03-05
      • ZHANG Lei1 LIANG Juncheng2 WU Jian1 GUO Qiuju1 1
        Vol. 33, Issue 4, (2010)
        摘要：The accurate measurement of 220Rn is important for dosimetry evaluation of natural radiation exposure. In thiswork, based on three commonly used radon measuring devices, i.e. AB5, RAD7 and, AlphaGuard, we developed their use for 220Rn measurement, and their experimental results were compared. The AB5 grab measurement method is simple in principle with stable measurement results, and can be used as a reference method of measuring 220Rn, through its lower detection limit is a little higher. The 220Rn measurement result given by RAD7 is influenced by the status of desiccant and need a timely calibration. AlphaGuard flow mode has the advantage of low detection limit, but can only be a general reference, because of its sampling flow rate and the status of front-end sampling pipe.  
        关键词：220Rn;Accurate measurement;Comparative experiment;Reference method   
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        发布时间：2021-03-05
      • HAN Yanjiang1,2 CHENG Dengfeng1 ZHANG Lan1 ZHENG Mingqiang1 ZHOU Wei1 YIN Duanzhi1 WU Mingxing1 MA Yufei1,2 WANG Yongxian1 1
        Vol. 33, Issue 4, (2010)
        摘要：Stromal cell-derived factor-1 (SDF-1) and its receptor CXCR4 play an important role in the carcinogenesis and metastasis of tumors. CXCR4 can be a potential target for the in vivo imaging of tumors. T140 is a specific antagonist of chemokine receptor CXCR4. By optimizing the reaction parameters, a peptide ligand of CXCR4, [18F]FB-AcTZ14011 was prepared through 18F labeled prosthetic group [18F]SFB and coupled with the analog of the peptide T140. After HPLC purification, radiochemical purity of the labeled peptide was more than 96%, and [18F]FB-AcTZ14011 was produced in 3 h with a radiochemical yield of 3% (without decay-correction).  
        关键词：Chemokine;Stromal cell-derived factor-1(SDF-1);SFB;18F   
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        发布时间：2021-03-05
      • ZHANG Binqing WU Tao SUN Xun AN Rui
        Vol. 33, Issue 4, (2010)
        摘要：Report gene HSV1-TK and therapy gene were connected by IRES, and recombinant adenovirus vector Ad5-TK-IRES-BDNF-EGFP was constructed and infected with BMSCs at MOI of 0, 50, 100, 150, 200 and 250, with the control recombinant adenovirus vector of Ad5-EGFP. Green fluorescence cell positive rate was observed under the microscopy. MTT assay was used to determine the cell proliferation. bFGF and EGF were used to induce the BMSCs, and RQ-PCR to determine target gene expression in infection BMSCs. Uptake of 131I-FIAU was assessed by gamma counter. The data were processed by SPSS11.code. Recombinant adenovirus at MOI 150 had high infection efficiency and low toxic in BMSCs. There was a strong relation between the mRNA expression of TK and BDNF in infection BMSCs. The significance between the infection BMSCs and control BMSCs for uptake of 131I-FIAU at all the time points was t=23.06–173.83 and P<0.05 (n=3). Recombinant adenovirus vector had high infection and low toxic for BMSCs, and effective uptake of 131I-FIAU. This suggests a suitable gene vector for tracing genetically modified stem cells.  
        关键词：Reporter gene;Stem cells;Gene therapy;Adenovirus   
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        发布时间：2021-03-05
      • PENG Zhenxun ZHANG Peng HE Chaohui
        Vol. 33, Issue 4, (2010)
        摘要：In all types of nuclear battery, the structure of parallel plate direct-collection nuclear cell (DCC) is the simplest. However, this kind of DCC has low energy conversion efficiency, because a considerable part of the charged particles emitted by the radioisotope move reversely into the emitter electrode, producing just waste heat. A novel structure of nuclear battery, which integrates thermoelectric conversion device with the DCC, is designed to make use of the waste heat. In this case, the waste heat generated in DCC can be utilized, and the creative structure of composite nuclear battery can increase about 1% efficiency of DCC.  
        关键词：Nuclear battery;Thermoelectric conversion;Waste heat utilizing;Composite nuclear battery   
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        发布时间：2021-03-05
      • YANG Yanqiu YANG Tongzai HAO Fanhua LUO Shunzhong HE Yuhui JIANG Tao YANG Liang
        Vol. 33, Issue 4, (2010)
        摘要：SF6 gaseous tracer is an effective technology for airtight test of voluminous containers. In this work, with SF6 gaseous tracer, the dynamic leakage of a voluminous inter-explosion container was tested. Kr was selected to indicate the loss of SF6 caused by the explosion-caused high temperature. The results showed that the gas leakage for various airtight points occurred a short time after explosion, and attenuated rapidly with time by exponential order to the stable leavl of 10–12–10–13 L/h in 29 hours after the explosion. As a result, the shock wave was considered as the chief matter responsible for gas leak. The material and mechanical structures for airtightness were not damaged.  
        关键词：Leakage test;Tracer technology;Gaseous tracer;SF6   
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        发布时间：2021-03-05
      • WEI Wei1 GONG Min1 ZHANG Peng1 ZHANG Yu1 HUANG Wenheng1 KANG Wu2 ZHANG Dong2 TAN Zhaoyi2 1
        Vol. 33, Issue 4, (2010)
        摘要：With weight loss method, metallurgical observation, SPM and EIS, the corrosion behavior of 1Cr18Ni9Ti steel in washing condition with different concentrations KMnO4 +10% HNO3 solution was studied. The results showed that 1Cr18Ni9Ti steel in the system occurred intergranular corrosion, and the surface roughness increased. Meanwhile, with the increase of the concentration of KMnO4, the corrosion rate rose. When the KMnO4 concentration was 0.5%, the corrosion rate was about 80 nm/h, and following phenomena were observed: the charge transfer resistance decreased, the metal corrosion resistance and the intergranular resistance reduced, the intergranular corrosion intensified, the interface capacitance increased, and the uniformity of metal surface topography decreased.  
        关键词：Nuclear decontamination;1Cr18Ni9Ti steel;Acidic potassium permanganate;Intergranular corrosion;Surface roughness;Corrosion behavior   
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        发布时间：2021-03-05
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