最新刊期
      卷 0 ， 期 0 ， 2020
      • CAO Hongping1,2 CHEN Huanguang1 XU Ruinian1 TANG Junlong1 LI Deming1 1
        Issue 10, (2006)
        摘要：A personnel and machine protection system for the picosecond accelerator has been built. The key of the system is to send on/off of three triggering signals which are those of electron gun, 2856 MHz and 476 MHz, respectively, to ensure the safety of users and the accelerator. This paper describes the emergencies interlocked by ADAM5511 and timing trigger processor, and some secondary functions which improve the efficiency of the protection system completed in upper layer software.  
        关键词：Safety protection;ADAM5511;Picosecond accelerator   
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        发布时间：2021-03-12
      • XU Pengshou SUN Bai ZOU Chongwen WU Yuyu PAN Haibin XU Faqiang
        Issue 10, (2006)
        摘要：The adsorption and the thermal oxidation of Zn on 6H-SiC surface and the interface formation of ZnO/SiC have been investigated by using synchrotron radiation photoelectron spectroscopy (SRPES) and X-ray photoemission (XPS). The results show that at the initial stage of Zn adsorption, Zn can capture and bond with O remaining on the SiC surface. With increasing of Zn coverage, the surface exhibits metallic characterization. When the deposited Zn film is annealed at 180℃ in oxygen flux with the pressure of 2.0×10-4 Pa, it could be partly oxidized to form ZnO. Part of Zn atoms could escape from the surface due to its low evaporation temperature in UHV condition. While annealed at 600℃ in same oxygen flux, the total deposited Zn atoms could be oxidized to form ZnO. During annealing process, the substrate is also oxidized, which induces a thin layer of silicon oxide existing at the interface of ZnO/SiC. By using the results of SRPES and XPS, the valence band offset of ZnO/SiC is calculated to be 1.1 eV.  
        关键词：SiC;Zn;ZnO;Thermal oxidation;Photoelectron spectroscopy;Synchrotron radiation   
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        发布时间：2021-03-12
      • REN Chunsheng MU Zongxin WANG Younian
        Issue 10, (2006)
        摘要：Ion source technology is an important embranchment in plasma study. At the same time, the ion source which can produce high beam current at low extracting voltage is an important pursued aim due to its wide application fields, such as ion beam etching, ion beam sputtering deposition, the study on the interaction between ion beam and materials, and so on. An argon ion source used for sputtering deposition has been successfully developed based on the construction of hollow cathode connecting hollow anode and the technologies of thermal cathode electron emission arc discharge, plasma magnetic confinement and ion extracting on a curving surface. The dependence of the discharge arc current on the arc voltage and the filament heating current, and the dependence of the ion extracting efficiency on the arc current and the working gas pressure have been studied. The extracting voltage of the ion source can be changed between 0—4.0 kV continuously. The maximum extractable ion beam current is 100 mA and the maximum deposition rate is 0.45 nm/s using Ti as the sputtering material. The ion source can be operated continuously for 160 h.  
        关键词：Argon ion source;Hollow cathode;Hollow anode;Magnetic field;Ion source characteristics;Sputtering deposition   
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        发布时间：2021-03-12
      • SU Zhiwei CHEN Qingchuan HAN Dakai
        Issue 10, (2006)
        摘要：A radio frequency ion beam source with a 10cm×30cm rectangular cross-section beam is developed and tested. This source is designed to provide large cover area for ion beam etching and polishing. With a four grid extraction system, this source can operate in argon at beam energies from 100 eV to 1000 eV. When the RF power is about 900 W, beam currents can reach to 600 mA in argon. The beam current uniformity is better than ±6% along the major axis over 27 cm length at a distance 26 cm from the ion beam source.  
        关键词：RF ion beam source;Inductive couple plasma (ICP);Ion beam etching;Ion beam polishing   
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        发布时间：2021-03-12
      • YE Longchun JIANG Xinbiao
        Issue 10, (2006)
        摘要：In order to study the character of disturbing signals in the measurement of fast neutron field with FNS-100 proportional counter, spectra of the low energy gamma rays produced by 60Co as well as 7 MeV and 10 MeV high energy gamma rays are calculated and analyzed. In addition, the disturbance from 3He recoil and proton recoil are simulated. The results show that gamma rays give little effect on the measurement of fast neutron energy spectra, but 3He recoil and proton recoil have considerable effect on it.  
        关键词：Proportional counter;~3He recoil;Proton recoil   
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        发布时间：2021-03-12
      • ZOU Qin1 ZHAO Xin1,2 SUN Wanfu1 1
        Issue 10, (2006)
        摘要：The polymerization conversion and segment motion of α- methacrylic acid were studied using 1H NMR spectra, spin-lattice relaxation time and spin-spin relaxation time. Meanwhile, the change of the proton chemical shifts in different solvents was observed. The results indicate that the polymerization conversion of α- methacrylic acid increases with the absorbed dose rising and decreases with the dose-rate rising. The proton spin-lattice relaxation time of α- methacrylic acid keeps unchanged while the spin-spin relaxation time shows a double exponential feature. It is found that the proton chemical shifts vary with the blending solvent.  
        关键词：α- methacrylic acid;Radiation induced polymerization;~1H NMR;Spin-lattice relaxation time;Spin-spin relaxation time   
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        发布时间：2021-03-12
      • CHEN Juequan ZHU Yubao FU Yanzhang ZHONG Guoqiang
        Issue 10, (2006)
        摘要：Measurements of the neutron flux distribution have been performed and presented in this paper. Two kinds of neutron detector system based on high gamma-resistant BF3 and 3He proportional counters, associated electronics and data acquisition system were used in the experiments. In HT-7 2005 spring campaign, the neutron fluxes of different horizontal and vertical positions outside the vacuum vessel were measured and analyzed in detail under the same discharge conditions. The influences of the existence of the vacuum vessel and the iron-core transformer were studied. The consistency between the measurement and the three-dimensional numerical calculations has been proved.  
        关键词：Tokamak;Neutron flux distribution;Proportional counter   
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        发布时间：2021-03-12
      • ZHAO Yuhan1 MA Qiang1 YUAN Jiatao2 XIA Weidong1 1
        Issue 10, (2006)
        摘要：The diameter of non-thermal arc plasma is an important parameter to determine the current density of arc that determines temperature and density of the electrons. The images of gliding arc discharge driven by magnetism at atmosphere are captured by using CCD method. The distribution of shade of gray of the arc can be drawn from the CCD photographs. The boundary and diameter of the arc are determined according to the specific curve fitting. The diameter projecting in the direction of motion of the arc (front viewed diameter) and the diameter projecting in the vertical direction of motion of the arc (side viewed diameter) are obttained. The relationships between the diameter and the arc current as well as the magnetic field are analyzed. The front viewed diameter and side viewed diameter are compared too.  
        关键词：Gliding arc driven by magnetism;Non-thermal arc;Arc diameter;CCD photography   
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        发布时间：2021-03-12
      • ZHANG Lai1 XU Feng2 ZHANG Zhulin2 1
        Issue 10, (2006)
        摘要：Based on both analytical and numerical methods, the authors have investigated a theory proposed by Glazov in 1994 for finding the depth distributions of momentum deposition by atomic particles in elastic collisions. It is shown that the integro-differential equations derived by Glazov are incorrect because of the “entanglement” of two original independent variables. The “singularity” of the distributions at the target surface originated from the “entanglement”. The traditional Boltzmann transport equation of the depth distributions of momentum deposition cannot be equivalent to the Glazov’s equation. Therefore, all of the results derived from the Glazov’s equation turned out to be questionable. On the other hand, the numerical calculations with high accuracy (usually the moments were found up to n=300 with 28-decimal-digits precision) published by Glazov at the same time were repeated in this work, and it was shown that the Glazov’s numerical results were not accurate enough to reproduce most of figs in his work. In this work, the Padé approximation has been used with higher accuracy (the moments found up to n=980 with 500-decimal-digits precision) to compute the Fourier transform of the momentum deposition depth distribution functions f(k,η) and fL(k). Our numerical results show that the Padé approximation is a powerful tool to research these depth distribution functions.  
        关键词：Transport equation;Momentum deposition depth distribution;Padé approximation   
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        发布时间：2021-03-12
      • XU Lijun CHEN Kesheng LIN Min YE Hongsheng CHEN Yundong WU Changping LI Huazhi
        Issue 10, (2006)
        摘要：SISAK (Short-lived Isotopes Studies by the AKUFVE technique), the fast on-line solvent extraction system, is widely applied in the separation and identification of short-lived nuclides, the synthesis of super-heavy elements and the study of nuclides far from stabilitying. The procedure, principle and development of SISAK have been described here. The equipment based on SISAK technology was established in China Institute of Atomic Energy (CIAE). Using this equipment together with gas-jet recoil transportation technology, short-lived nuclides were separated from the fission products. A practical example further demonstrated the superiority of SISAK technology in fast chemical separation.  
        关键词：SISAK (Short-lived Isotopes Studies by the AKUFVE technique);Fast chemical separation;Short-lived nuclides;High-speed centrifugal extraction;Gas jet recoil transportation   
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        发布时间：2021-03-12
      • WANG Mouhua FENG Cuilan CHENG Kangmin SHEN Yumei
        Issue 10, (2006)
        摘要：Three synthesis methods, reaction mechanism and applied range of cyclopentadienyltricarbonyl rhenium complexes are summarized. The applications of cyclopentadienyltricarbonyl rhenium complexes in labeling little molecules, estrogen receptor (ER) ligands and peptide are especially reviewed.  
        关键词：Cyclopentadienyltricarbonyl rhenium complexes;Synthesis;Labeling;Radiopharmaceuticals   
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        发布时间：2021-03-12
      • HU Yaer ZHANG Naizheng LI Aimin XIA Zongqin
        Issue 10, (2006)
        摘要：To observe the effect of certain active components from traditional Chinese medicinal herbs on Aβ secre- tion rates with L-[35S]-Methionine, β-amyloid peptide (Aβ) in SK-N-SH cell lines stably transfected with APP695 was metabolically labeled with L-[35S]-Methionine. The supernatant from culture medium was immunoprecipitated with monoclonal antibody against Aβ22-35, Western blot was carried out, and the gray density of Aβ band in the autoradiograph was measured by an image analysis system. The active components from certain traditional Chinese medicinal herbs (ZMS from Zhimu and AST and HT from Huangqi) were added to the culture medium at a final con- centration of 10-5 mol/L. An Aβ band in the autoradiograph was clearly viewed in the culture medium after 24 h in- corporation of [35S]-Methionine which represent the secretion rate of Aβ by the cells. One of the 3 tested components (AST) could significantly reduce the Aβ secretion rate while the other two showed no effect. The preliminary result showed that certain active component from traditional Chinese medicines could decrease the Aβ secretion rate but other active components could not. Combined use of the AST and ZMS was more effective than single AST.  
        关键词：Aβ secretion rate;[35S]-Methionine;Traditional Chinese medicine;Active component   
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        发布时间：2021-03-12
      • LI Bin1 LI Jianfeng2 WANG Xuebin3 HUANG Gang1,4 1
        Issue 10, (2006)
        摘要：This paper describes the preparation of N,N’-diethyl-6-chloro-(4’-iodophenyl)-imidazo-[1,2-a] pyridine-3-acetamide (CLINDE) and [131I]- labelled ([131I]- CLINDE). Non-radioactive imidazo[1,2-a]pyridine was synthesized by condensation of 5-chloro-2-aminopyridines with the bromo keto amides. Radiolabelling [131I]- imidazo [1,2-a]pyridines was prepared by iododestannylation with Na[131I] in the presence of peroxide of hydrogen and purified by C18 reverse phase HPLC. Non-radioactive imidazo-[1,2-a] pyridine was synthesized at a total yield of 30.8%. Radiolabelling [131I]-imidazo [1,2-a]pyridines was prepared with a radiochemical yield of 80% and a radiochemical purity of greater than 98%. An improved, economical process is suited for preparing N, N’-diethyl-6-chloro-(4’-iodo-phenyl)-imidazo-[1,2-a]pyridine-3-acetamide and its radiosynthesis.  
          
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        发布时间：2021-03-12
      • DU Minghua ZHONG Ying ZHU Danjie
        Issue 10, (2006)
        摘要：To observe the viability of blood flow and revascularization and pathological change after ligating different blood vessels supplying femoral head and to provide basis of choosing different treatment of avascular necrosis of femoral head (ANFH), the medial and lateral femoral circumflex arteries of rabbits were ligated for different groups. Group A ligated both medial and lateral femoral circumflex arteries; Group B ligated the medial femoral circumflex arteries; and Group C ligated the lateral femoral circumflex arteries. All rabbits were given an injection of 99mTc-MDP of 37 MBq via anterior auricular veins before the operation. The radioactive counts of experimental femoral head (Ehead), experimental femoral shaft (Eshaft), control femoral head (Chead) and control femoral shaft (Cshaft) of rabbits were measured by SPECT in the 2 h, 3 d, 1 w (week), 4 w and 8 w after operation. The results show that ① Ehead/Chead is 1.020±0.063 and Chead/Cshaft is 2.72. ②Ehead/Chead and Ehead/Eshaft of groups A and B decreased distinctly. The blood supply was reestablished in 1—8 weeks after the operation. No significant difference was found between these two groups (P>0.05). ③Ehead/Chead and Ehead/Eshaft of group C decreased indistinctivly. The blood supply was reestablished after the postoperative at 3 d and the ratio increased indistinctly. Significant difference was found between group C and group A or B (P<0.05). It is concluded that the medial femoral circumflex artery is the main blood vessel supplying the femoral head, and the quantitative analysis of 99mTc-MDP bone imaging is a good method to evaluate the ANFH.  
        关键词：Avascular necrosis of femoral head (ANFH);Blood supply;Single photon emission computed tomography   
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        发布时间：2021-03-12
      • SHANG Lei TAN Hong CONG Xiaoyan LU Yeming
        Issue 10, (2006)
        摘要：The cell circuit design and test of a high power solid state modulator for linac application are presented in the paper. The 3.3 kV IGBT and large dimension nanocrystalline core are used in the cell circuit design. The driving, protection, reverse energy absorbing and bias circuit are also presented. Dynamic magnetic performance of the core and the waveforms of the cell circuit are measured.  
        关键词：Solid state induction modulator;Nanocrystalline core;Cell modulator circuit   
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        发布时间：2021-03-12
      • JING Lan QIAO Weimin XU Yang JI Peng LIU Caihong MA Yunhai
        Issue 10, (2006)
        摘要：The HIRFL-CSR EVMEbus controller is developed in IMP. The controller is based on AT91RM9200 (ARM9) microprocessor, which is in 0.8 mm BGA package. The controller runs LINUX OS, and can connect with standard VGA display, keyboard, and mouse. There are 10M/100M Ethernet, USB, RS-232, RS-485 and CANBUS interfaces on the board. It supports storage devices SD Card and CF Card. The backboard interface logic is pro- grammed in VHDL and is programmed into an in-system configurable FPGA device. The bus can drive high current up to 64 mA. It is not only compliant to VME specification, but also has flexibility of the programmable signal defini- tion. Being a key module in HIRFL-CSR control system, the controller can be used as a local controller and also a remote gateway controller.  
        关键词：ARM9;Bus controller;Universal computer peripheral interface;Embedded LINUX   
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        发布时间：2021-03-12
      • XIE Bo WANG Heyi LIU Yunnu GUAN Rui
        Issue 10, (2006)
        摘要：The water detritiation system (WDS) of tritium plant for the International Thermonuclear Experimental Reactor (ITER) was designed. The concept of the Combined Electrolysis Catalytic Exchange and Gas Chromatogra- phy (CECE-GC) process was selected for the system and subsystems’ descriptions of the WDS. ITER-WDS is char- acterised from the present demonstration system by rejecting the use of a recombiner and alkali electrolyzer, but a solid polymer electrolyzer (SPE) and a Pd/Ag membrane permeator system are adopted to recover tritium.  
        关键词：Tritiated water treatment;Design;Fusion reactor   
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        发布时间：2021-03-12
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