Research of High-Dimensional Time-Varying Network Analysis Method

网络分析尤其是相关网络分析方法一直以来应用于多领域的研究当中，在大数据浪潮不断革新数据分析方法的背景下，网络分析也面临着高维数据的处理问题。基于网络结构稀疏性的假定，许多相关研究提出关于高维网络数据的网络结构估计方法，这类方法主要对固定时期内的静态网络结构进行估计。然而，由于大量个体以及不确定影响因素的参与，网络个体间的关联结构也充斥着复杂性，结点间的关联结构也有可能随着时间的推移而发生动态的变化，仅凭借传统的静态网络分析并不能较好地刻画出网络结构的演化特征。 在本文的研究中，在详细论述相关网络理论、马尔科夫随机场、伊辛模型等基础理论框架的基础上，详细定义了动态的时变网络结构，针对高维二值型...Related network analysis has been applied in many research fields. In the background where big data brings a lot innovation in data analysis method, the problem of modeling relational structure for high-dimensional data deserve further investigation in the field of network analysis. There is a rich literature in estimating the relational structure from high-dimensional data by assuming the sparsit...学位：经济学硕士院系专业：经济学院_统计学学号：1542013115203

1butenemetathesisoveramoo3hmordenitealuminacatalyst

Metathesis reactions of 1-butene over a MoO3/H-mordenite-alumina (MoO3/HM-Al2O3) catalyst were investigated in a fixed-bed reactor. The catalysts were characterized by NH3 temperature-programmed desorption, X-ray diffraction, and H-2 temperature-programmed reduction. The results indicate that under the reaction conditions of 110 degrees C, 0.1 MPa, WHSV = 1.5 h(-1), and TOS = 1 h, MoO3 shows no isomerization and metathesis activities. Al2O3, HM-Al2O3, and HM supports only possess suitable isomerization activity controlled by the acidity of the samples, and the isomerization products increase with the acid strength. The yields of products are close to each other on the MoO3/Al2O3 catalyst with less metathesis activity. MoO3/HM-Al2O3 has the best reaction performance, on which 1-butene conversion, propene yield, and pentene yield are 84.9%, 28.5%, and 20.6%, respectively. The acidity of the catalyst and the oxidation state of Mo species are the two key factors for the catalyst performance for 1-butene metathesis

1butenemetathesisoveramoo3hmordenitealuminacatalyst

Metathesis reactions of 1-butene over a MoO3/H-mordenite-alumina (MoO3/HM-Al2O3) catalyst were investigated in a fixed-bed reactor. The catalysts were characterized by NH3 temperature-programmed desorption, X-ray diffraction, and H-2 temperature-programmed reduction. The results indicate that under the reaction conditions of 110 degrees C, 0.1 MPa, WHSV = 1.5 h(-1), and TOS = 1 h, MoO3 shows no isomerization and metathesis activities. Al2O3, HM-Al2O3, and HM supports only possess suitable isomerization activity controlled by the acidity of the samples, and the isomerization products increase with the acid strength. The yields of products are close to each other on the MoO3/Al2O3 catalyst with less metathesis activity. MoO3/HM-Al2O3 has the best reaction performance, on which 1-butene conversion, propene yield, and pentene yield are 84.9%, 28.5%, and 20.6%, respectively. The acidity of the catalyst and the oxidation state of Mo species are the two key factors for the catalyst performance for 1-butene metathesis

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^