具有随机节点结构的复杂网络同步研究

针对具有随机节点结构的复杂网络, 研究其同步问题. 基于Lyapunov稳定性理论和线性矩阵不等式技术给出了复杂网络同步稳定的充分性条件, 该充分性条件不仅与复杂网络的状态时延有关, 还与节点结构的概率分布有关. 数值仿真表明本文方法的有效性. 关键词： 复杂网络 随机节点 同步稳定 时滞     

Self-attenuation corrections calculated by LabSOCS Simulations for gamma-spectrometric measurements with HPGe detectors

Simulations from Laboratory Sourceless Object Counting System (LabSOCS) software were used to determine self-attenuation correction factor, which is defined as the efficiency ratio of the sample with the absorbing medium to that of the sample without absorbing medium. The semi-empirical self-attenuation correction formula F(μ) used to correct self-attenuation of a sample was applied. A comparison of the two methods reveals that formula of sample with φ 75 mm× 25 mm and φ75 mm× 10 mm can be, respectively, used in the self-attenuation correction for μ in the ranges of 0 to 0.5 cm^-1 and 0.5 cm^-1 to 2.0 cm^-1, indicating that the semi-empirical formula will not be used when μ has exceeded the interval. The semi-empirical formula value is consistent with the experimental value, within 7.9% accuracy. Therefore, this method is correct and effective. Both of our two methods can accurately produce a relative self-attenuation correction factor when the composition of the sample is known. The self-attenuation correction of a sample with unknown composition can only be carried out using a semi-empirical formula method.     

Experimental study on scintillation efficiency of ZnO:In to proton response

Film ZnO:In crystal is a good candidate for a scintillation recoil proton neutron detection system and the response of ZnO:In to protons is a crucial point. The energy response of ZnO:In to mono-energetic protons in the range of 10 keV-8 MeV was measured. The experiment was carried out in current mode, and Au foil scattering was employed, where the forward scattering protons were used for exciting the sample, and the backward scattering protons were used for monitoring the beam intensity. According to the result, the yield of light non-linearly depends on proton energy, and drops significantly when proton energy is low. The scintillation efficiency as a function of proton energy was obtained, which is very useful for researching the scintillation recoil proton neutron detection system.     

4He闪烁裂变中子探测器时间响应

研制了可用于脉冲辐射场中子探测的4He闪烁裂变中子探测器,并对其时间响应进行了理论和实验研究。采用经验公式和蒙特卡罗方法模拟计算了不同厚度裂变靶产生的裂变碎片和不同能量中子产生的反冲4He核在4He气中的飞行时间,并依据卷积原理推导出探测器的时间响应计算公式。计算结果表明,探测器的波形上升时间约为19.5 ns,半高宽约31.0 ns。用ING-103型稠密等离子体聚焦装置(DPF)脉冲中子发生器对探测器的时间响应进行了实验测量,实验结果与理论值基本一致。     

ZnO半导体电导型X射线探测器件研究

本文制备了基于ZnO纳米线阵列和ZnO薄膜的Ag-ZnO-Ag电导型X射线探测器件,研究了它们对X射线的响应特性.薄膜器件在100 V偏置时的响应度达到0.12μC/Gy,纳米线阵列器件在50 V偏压下的响应度达到0.17μC/Gy.器件工作机理研究表明,器件的响应过程与表面氧吸附与解吸附效应有关,氧气吸附与解吸附过程使得X射线辐照下的载流子寿命大幅度增加,从而使得器件对X射线具有较高的响应度.本文研究结果表明ZnO薄膜和纳米线阵列器件在X射线剂量测量领域具有应用前景.     

二次电子发射对质子束流测量精度的影响

二次电子发射直接影响法拉第探测器测量质子束流的精度,减小或消除二次电子发射的影响是提高束流测量精度的关键。根据二次电子补偿原理设计了二次电子补偿型同轴法拉第探测器,实验发现探测器测量质子束流强度时不能完全实现二次电子补偿。为改进和完善探测器的设计,从理论上分析了补偿片未能完全消除二次电子对束流测量影响的原因,是由于补偿片前向发射二次电子数目大于收集极后向发射二次电子数目所致。为此设计了质子束穿过金属箔发射二次电子测量装置,测量得到能量为5~10MeV质子穿过10μm厚铜箔时前向与后向发射二次电子产额,验证了理论分析的正确性。     

多晶氮化铜薄膜制备及性能研究

采用反应射频磁控溅射的方法在不同的氮气分压的条件下,在玻璃基底上成功制备了氮化铜(Cu3N)薄膜.XRD显示氮气的气氛影响薄膜的择优生长取向,在低氮气气氛时薄膜择优[111]晶向生长,在高的氮气气氛条件下薄膜的择优生长取向为[100].用Scherrer公式估算出薄膜晶粒的大小在17～26nm之间,实验并研究了薄膜的热稳定性和电学性质.结果表明,薄膜的热稳定性较差,在200℃退火1h后已经完全呈Cu的相,薄膜的电阻率随着填隙原子的数目减少从导体到绝缘体发生不连续的改变.     

模糊软集与模糊软群

在进行了阐述模糊软集的相关概念和性质后,给出了模糊软群的定义并研究了相关性质.     

磷酸铵镁法回收稀土分离废水中镁及氨氮的研究

磷酸铵镁法是一种有效的回收氨氮、磷和镁的方法。本文通过热力学计算,分析了反应过程及pH值对磷酸铵镁生成的影响规律。根据理论分析结果,进行了pH值、磷源、加料方式等因素对氨氮、磷去除率的影响实验。结果表明:以Na3PO4为磷源,通过向氮磷混合液中加入含镁废水,并控制反应液pH值为9时,氮磷镁去除率均可达98%以上,得到沉淀物经X衍射分析为六水磷酸铵镁。