掺钕聚甲基丙烯酸甲酯的光学特性

研究了制备的掺钕螯合物Nd(DBM)3Phen材料的吸收光谱、激发光谱、荧光光谱,应用Judd-Ofelt理论计算了该材料的强度参量．分析了钕离子激发态4F3／2的辐射寿命(631 μs)和4F3／2→4IJ′跃迁的受激发射截面和荧光分支比．     

多相体系中Ni-PMMA纳米复合材料的γ辐射制备

在多相体系中 ,运用γ射线辐射法 ,在常温常压下成功地一步合成了镍 聚甲基丙烯酸甲酯 (Ni PMMA)纳米复合材料 .XRD、TEM分析和IR光谱表明 ,在此实验条件下 ,镍离子和甲基丙烯酸甲酯已成功地被还原或聚合 ,镍粒子为面心立方 ,尺寸为 7.33nm .研究显示 ,用醋酸钠代替氢氧化钠或氨水作为碱性试剂 ,可以有效地控制体系的pH ,同时不影响单体的聚合 .     

用γ计数率的变化定位核元件的技术研究

用标准放射源进行模拟核材料库房监控实验,当放射源被转移出系统的时候,在不同位置探测了γ计数率变化,根据γ计数率变化的距离平方反比规律实现了被转移的放射源的定位,并估算了该放射源的源强.     

对动态缓变Reissner-Nordström黑洞量子辐射特征的研究

考虑到Reissner-Nordstrom黑洞的质量M和荷电量Q随时间t缓慢变化的情况,研究了此黑洞的量子辐射特征.结果表明,在动态缓变Reissner-Nordstrom时空中荷电Dirac粒子的量子热辐射谱与其黑洞蒸发率及随时间t缓变的M(t)和Q(t)等因素有关;动态缓变Reissner-Nordstrom黑洞量子非热辐射的最大能量与量子热辐射谱中的化学势相等.     

The Analysis and Improving of the Microwave Exciter in the Lower Hybrid Wave System

When we carry out lower hybrid wave heating and current driving plasma experiment at tokamak, we need mega-watt order of microwave power. The microwave signal at frequency of 2450 MHz is generated by a microwave exciter. According to the experiment＇s demands, the microwave exciter must provide output power of 1.5～ 2. 5 W with stabilized frequency and amplitude tobe used as the klystron input. Being amplified by the klystron, the microwave signal is transmitted through the transmitting system to the antenna and is emitted into the HL-2A tokamak. So we can see that the microwave exciter＇s function is very important to the lower hybrid wave heating and current driving plasma experiment.     

Deposition of Hydrogen-Free Silicon Nitride Thin Films by Microwave ECR plasma Enhanced Magnetron Sputtering at Room Temperature

Hydrogen-free silicon nitride （SiNx） films were deposited at room temperature by microwave electron cyclotron resonance （MW-ECR） plasma enhanced unbalance magnetron sputtering system. Both Fourier-transform infrared spectroscopy and x-ray photoelectron spectroscopy are used to study the bonding type and the change of bonding structures of the silicon nitride films. The results indicate that the chemical structure and composition of SiNx films deposited by this technique depend strongly on the N2 flow rates, the stoichiometric SiNx film, which has the highest hardness of 22.9 GPa, could be obtained at lower N2 flow rate of 4 sccm.     

A Compact Magnetically Insulated Line Oscillator with New-Type Beam Dump

We present a compact improved model of the magnetically insulated line oscillator with new-type beam dump and other novel features. In the experiments, high-power microwave of the TM01 mode is generated from the device with a frequency range of 1.73-1.78 GHz and a peak power level of above 2 GW, when the diode voltage is taken in the range 520-540kV, and the diode current is in the range 58-62kA. This confirms the simulation results.     

A Generalization of the Mean Size Formula of Wavelet Packets in Lp

The purpose of this paper is to investigate the mean size formula of wavelet packets in Lp for 0 〈 p ≤ ∞. We generalize a mean size formula of wavelet packets given in terms of the p-norm joint spectral radius and we also give some asymptotic formulas for the Lp-norm or quasi-norm on the subdivision trees. All results will be given in the general setting,     

HL-2A装置硅化对杂质线辐射的影响

在2004年的实验中，首次在HL-2A偏滤器装置上进行了硅化器壁处理，在这种硅化器壁的条件下，对轻重杂质的线辐射进行了研究，并与无硅化条件下的杂质特性作了比较。在实验中，通过观测杂质的辐射特性研究了硅化对杂质的吸附作用和硅化效果的维持。并通过调整硅化后的辉光放电清洗，研究了硅化对氢再循环的影响。     

A modal analysis for the acoustic radiation problems, Ⅱ. Examples

The acoustic radiation modes and the field distribution modes describe the radiation patterns of a complex vibrating surface and the field distribution patterns respectively. The physical meanings of the acoustic radiation modes and the field distribution modes are revealed by numerical method. For a sphere body, a spinning body and a rectangular body, the geometrical patterns of the acoustic radiation modes and the field distribution modes are given. The radiation mode 1 represents the radiation behavior of a monopole radiator, the radiation modes 2 through 4 represent the radiation behavior of dipole radiators respectively, and the radiation modes 5 through 9 represent the radiation behavior of quadrapole radiators respectively. The acoustic radiation modes and the field distribution modes introduce the multi-pole decomposition method into discussion of the acoustic radiation problems.