Study on sensitized radiation polymerization of solid trioxane on pilot-scale

A conversion rate of more than 90% was obtained in sensitized polymerization, and the output of radiation was double at a reduced total dose of 0.5 Mrad as compared to original 1 Mrad.The unpolymerized monomer could be removed simply by extraction under reduced pressure to save a large volume of organic solvent. The quota of raw material consumption would be reduced without influencing quality of the product.experiments indicated that the content of water in trioxane, even up to 300 ppm, has no effect on conversion o molecular weight. Irradiated trioxane was stored in dry air kept away from light at room temperature could effectively sustain the lifetime of active species even after a lapse of one month.The infrared spectrum, molecular weight distribution and physical mechanical properties of the product from sensitized radiation polymerization were identical with those of the unsensitized process.     

AFM studies of nonspecific binding of enzyme on DNA

Atomic force microscope(AFM) is used to study restriction endonuclease digestion of plasmid DNA,pWRr plasmid DNA is digested by Hind Ⅲ,and the specific and the nonspecific binding of the restriction endonuclease are imaged,and the biological function of the enzyme binding to nonspecific sites is discussed.In addition,it is found that nonspecific binding of Hind ǚ could not induce the DNA characteristic bending angle.     

Application of CCD Camera on Observation of Pellet Ablation

The high speed 2D CCD camera is used to make photos of H_α line emission during hydrogen pellet injection in HL-1M Tokamak, and the observation is performed from the direction of pellet injection. The process of pellet-plasma interactions is a very complex phenomenon. It may be divided as two stages: first, heating the     

Study on Adsorption Behavior of Pu

The present research concerns in the adsorption behavior of Pu on Fe, FeO, Fe2O3, Fe3O4 powder, granite and its major component minerals （quartz and feldspar, biotite, hornblende, pyrite, sphene, and clay minerals）. The results indicate that the adsorption mechanism is formation of surface complex,     

Cytotoxicity of fullerenols on Tetrahymena pyriformis

With the increasing use of fullerenes and their derivatives in a variety of fields, the toxicity and effects of fullerenes on humans and the environment have received considerable attention. In this study, the cytotoxicity of fullerene derivative, C60（OH）x, on Tetrahymena pyriformis was investigated. Cell growth inhibition was evaluated by counting with an optical microscope, and the generation time was calculated. It was indicated that the fullerenols caused a dose-dependent growth inhibition of the cells. The morphologic change in the damaged macronucleus of cells was observed using a fluorescent microscope. Superoxide dismutase （SOD）, glutathione peroxidase （GSH-PX）, and glutathione reductase （GR） levels were also measured for Tetrahymena pyriformis, using conventional methods. The results showed that fullerenols could reduce GSH-PX and GR activities. But no noticeable difference in SOD activity was observed between the treated groups and the control group. This indicated that the antiproliferative effect of fullerenols might be mediated by the reduction in the activities of GSH-PX and GR of cells and the destruction of the macronucleus.     

Adsorption Behavior of Pu on Granite

The adsorption behavior of Pu on granite was studied with batch experiment and 1 mol/L HClO4 was used to dissolve the Pu adsorbed on granite at ambient temperature. Sorption experiments are performed under atmospheric and anaerobic conditions(in an argon …     

Study on Coating of Plasma Spray Al_2O_3 on Surface of Molybdenum Alloy

Technics of plasma spray Al2O3 on the surface of molybdenum was studied. In this test the dimension of basal material was φ26 mm×10 mm, the powder purity was 99% and the granularity was 10-30 μm. After sandblasting the side of specimen was sprayed. The…     

Study on Coating of Plasma Spray Al2O3 on Surface of Molybdenum Alloy

实验研究在强冲击波作用下各种材料的状态方程，对于武器设计、新材料科学、地球和行星内部的地球物理学研究等研究领域都有非常重要的理论意义和广泛的应用前景。随着强激光技术的发展，实验室利用强激光产生稳定冲击波研究物质的状态方程已经实现。激光速度干涉仪已成为1个被普遍接受的测量自由面速度的诊断设备，可直接记录靶自由面速度随时间的变化。根据实验要求建立了光学记录速度干涉仪系统（图1），用以进行状态方程自由面速度数据的直接测量。     

Effects of Annealing on Luminescence of ZnO Films Deposited on Si Substrates by RF Magnetron Sputtering

Effects of growth ambience, annealing ambience and temperature on the photoluminescence (PL) emission properties of ZnO films deposited on Si (100) substrates by RF magnetron sputtering have been investigated. After annealing, the crystal quality of ZnO films was markedly improved, and the intensity of UV emission peak increased obviously. By varying the flow rate ratio of O2/Ar, annealing atmosphere in oxygen-deficient or oxygen-rich ambience and heating temperature during deposition, the evolution of peak intensities and positions for blue and green emission is formed. This is attributed to the deposition and annealing parameters that control the desorptions and adsorptions of oxygen atoms on the films, and leads to the changes of concentrations of Zinc and oxygen vacancies in the films.     

Investigation of MHD Potential on Crack Electrodes of Insulating Coatings

MHD potentials on the electrodes were investigated while MHD pressure drop for insulating coatings with and without the cracking or flaking was studied. MHD duct may be seen in Fig. 1 of Ref. [1]. We measure the potential difference between the     

Progress on Evaluation of Neutron Nuclear Data

1.The complele neutron data for natural calcium were evaluated and the datawere stored into Chinese Evaluated Nuclear Data Library(CENDL-2).     

Summary of Researches on ADS in China

China, as a developing country with a great number of population and relatively less energy resources, reasonably emphasizes the nuclear energy utilization development. To develop nuclear power in large scale, two problems must be solved. First, as we und…     

Study on Physical Basis of Cold Fusion

In order to understand questions about the study on cold fusion in these years,we have studied physical basis of cold fusion .Results show that even though the cold fusion is feasible theoretically in the view of physics,but its reaction ratio is too small to te detected so that it has no prospect for practical usage at present,However,in order to tackle urgent problem of being poor in energy resoureces,we have no choice but to pay more attention to controlled thermal nuclear fusion in a considerably long period of time.     

Biological effects of synchrotron radiation on crops

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Sorption Behavior of Hafnium on Ion Exchangers

In this work, we have studied the sorption behavior of hafnium on anion and cation resins.     

Improvement on Microscope Stabilization of Micro-beam Facility

近年来，对A≈100核区的核结构研究中，发现该区存在丰富的核结构信息，如原子核的磁转动、三轴形变、形状跃迁、形状共存和扁椭形变带等。本次实验选择的目标核为^106Ag。在中国原子能科学研究院的HI-13串列加速器上，     

Sorption Behaviour of W on Ion Exchangers

The half-life of 182Hf is long (T1/2=9×106 a) and the content of 182Hf is very low,accelerator mass spectrometry(AMS) must be used to detect it. However,the stable isobar 182W is a main interference for the AMS measurement of 182Hf. Therefore,the researc…     

Progress on Measurement of Nuclear Decay Data

1.The Studies on the Decay Scheme of 72.3-D ~(160)Tb (SunPunan Hu Dailing Ding Zhaozhong) The decay scheme of ~(160)Tb has been studied with Ge(Li)detector and 105cm~3 Ge(Li)-110 cm~3 HpGe coincidence system.Forty-one gamma rays havebeen observed.The energies(in keV)and relative intensities of gamma raysfirst observed in this work are 148.7(0.026),319.4(0.018),728.0(0.033),and 1125.0(0.007).Gamma ray with energy 239.7 keV reported in literatureis excluded.On the basis of these results,the decay scheme of ~(160)Tb has beenconstructed.Two excited states in ~(160)Dy at 1408.8 keV and 1694.1 keV havebeen proposed.     

Improvement on Microscope Stabilization of Micro-beam Facility

Micro-beam facility is the most precise termina1 in Beijing Tandem Accelerator National Laboratory (BTANL). The microscope is the key instrument for orientation. But it is not very stable. Firstly, there