CuO-CeO2-MnOx/γ-Al2O3催化剂选择性催化脱除NO机理研究

利用溶胶凝胶法制备CuO-CeO2-MnOx/γ-Al2O3催化剂颗粒,在固定床上测试其催化脱硝活性.CuO-CeO2-MnOx/γ-Al2O3催化剂在200～450℃范围内脱硝效率保持在70%以上.利用程序升温方法研究了催化剂对NH3的氧化性能,活性组分负载量增多,加强了催化剂对NH3氧化性能.红外表征显示NH3被吸附在催化剂的L酸位和B酸位.NO以多种硝酸盐物种在催化剂表面吸附.吸附态NH3参与SCR反应,但吸附态NO物种仅部分参加SCR反应.     

Extended collective bands in neutron-rich 109Ru

Levels in the neutron-rich 109Ru have been studied by observing the prompt γ-rays following the spontaneous fission fragments of 252Cf. The ground state band and the negative parity bands have been confirmed and extended. A positive parity band with the band head level at 332.5 keV is newly identified and suggested as a single-neutron excitation band built on the 7/2+ [404] Nilsson orbital. Some structural characteristics of these bands are discussed.     

Shape transitions in proton-rich Ho and Tm isotopes

Total Routhian Surface (TRS) calculations have been performed for even-even nuclei along proton drip line to study nuclear ground-state deformations, as well as the odd proton nuclei Ho and Tm isotopes. The drip line nuclei show the expected shape transition with the shell e?ects. Ground-state shape changes from prolate to oblate at 143Ho and 145Tm in these two isotopes, which is due to the γ instability around N =76.     

基于信息理论的γ能谱辨识新方法

提出了一种基于相对熵的放射源γ能谱识别方法。首先,利用主成分分析(PCA)算法压缩数据,构造γ射线能谱的特征空间。然后,采用随机化技术(RT)来使特征空间中γ射线能谱的特征值归一化,这样,γ射线能谱的特征空间可以看作是概率空间。最后,定义两个概率空间的相对熵来测量两个γ射线能谱的相对差异。大量实验表明,所提方法能够更加有效地辨识γ射线能谱, 不仅计算量小,而且对诸如统计浮动、谱峰偏移、底噪等因素具有很高的鲁棒性。     

MPFC-QuEChERS结合GC-MS/MS测定血液中γ-羟基丁酸

建立了一种快速多滤过型净化柱(MPFC)-QuEChERS结合气相色谱-串联质谱(GC-MS/MS)检测血液中γ-羟基丁酸(GHB)的新方法.通过考察样品前处理条件与仪器条件对检测结果的影响,确定了最优实验条件:0.1 mL血液样品中加入GHB-D6作为内标,以乙酸乙酯为萃取剂,上清液过MPFC-QuEChERS净化柱...     

一类多维实变Q-型空间的刻画

本文引入了一类Q-型空间Qκ,γ(Rn),利用Poisson积分得到了Qκ,γ(Rn)的Carleson型刻画.同时也得到了此类空间的小波刻画.     

(φ,γ)-凸函数与(φ,γ)-次微分

定义了基于Ben-T al广义代数运算的(,φγ)-凸函数,(φ,γ)-次微分,进而获得了关于(,φγ)-凸函数及(φ,γ)-次微分的一些分析性质.讨论了(φ,γ)-凸函数的等价条件.     

Eu掺杂对γ-Ce2S3合成温度及抗氧化性能的影响

本文以CeCl_3·7H_2O、Eu_2O_3、C_2H_2O_4·2H_2O为原料,制备了铈铕草酸盐沉淀,该沉淀经高温煅烧获得铈铕氧化物前驱体;以Ar气为载气、CS_2为硫源对铈铕氧化物前驱体进行硫化合成了Eu~(2+)掺杂的γ-Ce_2S_3。Eu~(2+)掺杂能够明显降低γ-Ce2S3的合成温度,Eu~(2+)/Ce~(3+)为0. 03时,在900℃硫化150min即可获得纯相的γ-Ce_2S_3,与不掺杂时合成γ-Ce_2S_3的温度相比降低了300℃左右;同时,Eu~(2+)掺杂能够提升γ-Ce_2S_3的抗氧化能力,氧化气氛下,Eu~(2+)/Ce~(3+)比例为0. 03的样品其氧化放热峰温度由不掺杂时的490. 6℃提高至553. 3℃。     

Influence of D-state in 4He on S Factor for the 2H（d, γ）^4He Reaction

We employ a direct capture method to study the influence of D-state in ^4He on S factor for the ^2H（d,γ）^4He reaction, in which the D-state component of the colliding deuterons and D-state component in ^4He ground state are considered. The parameters of Woods-Saxon （WS） potentials are obtained by reproducing the binding energy of d-d （i.e. ^2H-^2H） system, and d-d elastic scattering phase shifts calculated by the resonating group method. The theoretical results are in good agreement with the experimental data at Ec.m〈 3 MeV. The impact of the D state probability in ^4He on the extrapolated value of the astrophysical S factor for ^2H（d, γ）^4He reaction is discussed.     

光电倍增管在检测水泥浆液密度中的应用

为了高精度、非接触动态地检测灌浆工程中水泥浆液的密度，采用CR105型光电倍增管作为感光器件，设计了一种检测装置。该装置选用Cs-137作为光源，光电倍增管作为感光器件，196KB单片机作为微处理器，通过自行设计的模块化软件以及信号处理电路、显示打印输出电路实现对γ射线的检测、数据分析与处理。实验结果表明：该装置能够在恶劣环境下准确、快速地检测水泥浆液的密度；测量值不受浆液的流速、压力、温度、粘度和腐蚀等因素的影响；探测部分安装在高温、潮湿、高灰尘的灌浆工程施工现场仍能正常工作。