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A Solvability Criterion for Finite Groups

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Acta Mathematica Sinica,English Series 2016年第8期32卷 982-992页

作者： guo hua QIAN Tian Ze LI Department of Mathematics Changshu Institute of Technology

We show that if for every prime p, the normalizer of a Sylow p-subgroup of a finite group G admits a p-solvable supplement, then G is solvable. This generalizes a solvability criterion of Hall which asserts that a fin... 详细信息

关键词： Finite group solvable group Sylow normalizer supplement

Remarks on One-Dimensional Compressible Navier-Stokes Equations with Density-Dependent Viscosity and Vacuum

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Acta Mathematica Sinica,English Series 2010年第10期26卷 2015-2030页

作者： Zhen hua guo Chang Jiang ZHU Center for Nonlinear Studies and Department of Mathematics Northwest University Xi'an 710069 P. R. China Laboratory of Nonlinear Analysis Department of Mathematics Central China Normal University Wuhan 4300794 P. R. China

The Navier-Stokes system for one-dimensional compressible fluids with density-dependent viscosities when the initial density connects to vacuum continuously is considered in the present paper. When the viscosity coefficient u is proportional to pθ with 0 〈 θ 〈 1, the global existence and the uniqueness of weak solutions are proved which improves the previous results in [Vong, S. W., Yang, T., Zhu, C. J.： Compressible Navier-Stokes equations with degenerate viscosity coefficient and vacuum II. J. Differential Equations, 192（2）, 475-501 （2003）]. Here p is the density. Moreover, a stabilization rate estimate for the density as t → ＋∞ for any θ 〉 0 is also given.

关键词： Compressible Navier-Stokes equations density-dependent viscosity vacuum asymptotic behavior

RNA silencing:From discovery and elucidation to application and perspectives

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Journal of Integrative Plant Biology 2022年第2期64卷 476-498页

作者： Jian-hua Zhao Hui-Shan guo State Key Laboratory of Plant Genomics Institute of Microbiologythe Chinese Academy of SciencesBeijing100101 China CAS Center for Excellence in Biotic Interactions University of the Chinese Academy of SciencesBeijing100049 China

RNA silencing(or RNA interference,RNAi)is a conserved mechanism for regulating gene expression in *** discovery of natural trans-kingdom RNAi indicated that small RNAs act as signaling molecules and enable communication between organisms in different *** phenomenon and potential mechanisms of trans-kingdom RNAi are among the most exciting research *** better understand trans-kingdom RNAi,we review the history of the discovery and elucidation of RNAi *** on canonical RNAi mechanisms,we summarize the major points of divergence around RNAi pathways in the main eukaryotes’kingdoms,including plants,animals,and *** review the representative incidents associated with the mechanisms and applications of trans-kingdom RNAi in crop protection,and discuss the critical factors that should be considered to develop successful trans-kingdom RNAi-based crop protection strategies.

关键词： crop protection gene expression RNA silencing small RNAs trans-kingdom RNAi

（G, s）-Transitive Graphs of Valency 7

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Algebra Colloquium 2016年第3期23卷 493-500页

作者： Songtao guo Yantao Li Xiaohui hua School of Mathematics and Statistics Henan University of Science and Technology Luoyang Henan 471023 China College of Arts and Science Beijing Union University Beijing 100091 China College of Mathematics and Information Science Henan Normal University Xinxiang Henan 453007 China

Let X be a finite simple undirected graph and G an automorphism group of X. If G is transitive on s-arcs but not on （s ＋ 1）-arcs then X is called （G, s）-transitive. Let X be a connected （G, s）-transitive graph of a prime valency p, and Gv the vertex stabilizer of a vertex v E V（X） in G. For the case p = 3, the exact structure of Gv has been determined by Djokovid and Miller in [Regular groups of automorphisms of cubic graphs, J. Combin. Theory （Ser. B） 29 （1980） 195-230]. For the case p = 5, all the possibilities of Gv have been given by guo and Feng in [A note on pentavalent s-transitive graphs, Discrete Math. 312 （2012） 2214-2216]. In this paper, we deal with the case p = 7 and determine the exact structure of the vertex stabilizer Gv.

关键词： symmetric graph s-transitive graph (G s)-transitive graph

Harmoniousness analysis of total amount control of water use

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Water Science and Engineering 2014年第1期7卷 49-59页

作者： Qian-qi YIN guo-hua FANG College of Water Conservancy and Hydropower Engineering Hohai University

Based on the fundamental principles of total amount control of water use, the harmony theory was used in this study to develop a concept of the degree of harmony of total amount control of water use. Based on this concept, the harmoniousness of total amount control of water use was analyzed in terms of the supply and demand of water resources, water resources management, water use benefits, and water-saving level. An evaluation index system of the degree of harmony of total amount control of water use was established, and a method for calculation of the degree of harmony of total amount control of water use was developed based on the analytic hierarchy process （AHP） and fuzzy comprehensive analysis （FCA） methods. The new evaluation index system was applied to a certain area in Jiangsu Province, China. The degree of harmony of total amount control of water use over this area was calculated for different years. Results indicate that the evaluation index system and calculation method proposed in this study are feasible, and such a harmoniousness analysis can provide scientific references for the strict water resources management system that will be implemented in China in the near future.

关键词： total amount control of water usel degree of harmony evaluation index system quantification method analytic hierarchy process method fuzzy comprehensive analysis method

Calibration and Experimental Research of a multiple-wavelength Flame Temperature Instrumentation System

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Journal of Thermal Science 2004年第4期13卷 371-375页

作者： Zhihong Li Shi Liu huaiping mu Fan Jiang Jianmin guo Chinese Acad Sci Inst Engn Thermophys Beijing 100080 Peoples R China

This paper presents a study on a novel instrumentation system for the measurement of temperature distribution of combustion flames. This system operates upon the three-color principle combining advanced optical sensing and digital image processing techniques. It comprises an endoscope, a light splitter assembly, a CCD camera, a frame-grabber and associated software. This system was calibrated using a blackbody furnace as standard temperature source. The relationship between flame temperatures and grey-level of the images was established through image processing and function correlation. Experimental results obtained on a gas-fired combustion rig provide flame images and temperature distributions on three different wavelengths. Based on the flame temperature distribution the combustion conditions can be analyzed. Experimental results also reveal that this system is capable of online measurement of temperature distribution in a combustion zone. This system can potentially be applied to many areas such as power generation, metallurgy, chemical engineering. It is also a powerful tool for improving the control of combustion process. Keywords three-color method - flame monitor - temperature - imaging processing CLC number TK311

关键词： three-color method flame monitor temperature imaging processing

Anticancer effects of sweet potato protein on human colorectal cancer cells

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World Journal of Gastroenterology 2013年第21期19卷 3300-3308页

作者： Peng-Gao Li Tai-hua mu Le Deng Key Laboratory of Agro-products Processing Ministry of AgricultureInstitute of Agro-products Processing Science and TechnologyChinese Academy of Agricultural Sciences School of Public Health and Family Medicine Capital Medical University Beijing municipal Key Laboratory of Clinical Epidemiology

AIM: To investigate the effects of proteins purified from sweet potato storage roots on human colorectal cancer cell lines. METHODS: 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, Hoechst 33258 nuclear staining and Boyden transwell chamber methods were used to determine whether purified sweet potato protein (SPP) from fresh sweet potato roots affected proliferation, migration and invasion, respectively, of human colorectal cancer SW480 cells in vitro . The inhibitory effects of SPP on growth of human colorectal cancer HCT-8 cells intraperitoneally xenografted in nude mice and spontaneous lung metastasis of murine Lewis lung carcinoma 3LL cells subcutaneously transplanted in C57 BL/6 mice were also investigated in vivo . RESULTS: SPP inhibited the proliferation of SW480 cells in a dose-dependent manner, with an IC 50 value of 38.732 μmol/L (r2 = 0.980, P = 0.003) in the MTT assay. Hoechst 33258 nuclear staining further revealed inhibition of cell viability and induction of apoptosis by SPP. The transwell assay disclosed significant reduction in migrated cells/field by 8 μmol/L SPP (8.4 ± 2.6 vs 23.3 ± 5.4, P = 0.031) and invaded cells/field through the ECMatrix by 0.8 μmol/L SPP, compared with the control (25.2 ± 5.2 vs 34.8 ± 6.1, P = 0.038). Both intraperitoneal (ip) and intragastric (ig) administration of SPP led to significant suppression of growth of intraperitoneally inoculated HCT-8 cells in nude mice to 58.0% ± 5.9% (P = 0.037) and 43.5% ± 7.1% (P = 0.004) of the controls, respectively, after 9 d treatment. Bloody ascites additionally disappeared after ip injection of trypsin inhibitor. Notably, ig and ip administration of SPP induced a significant decrease in spontaneous pulmonary metastatic nodule formation in C57 BL/6 mice (21.0 ± 12.3 and 27.3 ± 12.7 nodules/lung vs 42.5 ± 4.5 nodules/lung in controls, respectively, P < 0.05) after 25 d treatment. Moreover, the average weight of primary tumor nodules in the hind leg of mice decr

关键词： Sweet potato protein Colorectal cancer Cell proliferation Cell invasion Metastasis

A New Algorithm for Decomposition of Graphical Models

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Acta Mathematicae Applicatae Sinica 2012年第3期28卷 571-582页

作者： Ping-feng XU Jian-hua guo School of Mathematics and Statistics Northeast Normal UniversityChangchun 130024China School of Basic Science Changchun University of TechnologyChangchun 130012China

In this paper, we combine Leimer＇s algorithm with MCS-M algorithm to decompose graphical models into marginal models on prime blocks. It is shown by experiments that our method has an easier and faster implementation... 详细信息

关键词： decomposition graphical models MCS-M algorithm Leimer's algorithm prime blocks

Experimental Study on a New Dual-Layer Granular Bed Filter for Removing Particulates

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Journal of China University of Mining and Technology 2007年第2期17卷 201-204页

作者： YANG guo-hua ZHOU Jiang-hua Maritime College Ningbo University Ningbo Zhejiang 315211 China

A new dual-layer granular bed filter for hot gas cleanup was invented and studied experimentally. Fine sand,0.5-1 mm grain size and about 1350 kg/m3 bulk density,was used as the lower layer of the filter. Expanded perlite par-ticles,2-5 mm grain size and about 70 kg/m3 bulk density,was used for the upper layer of the filter in this study. It was confirmed that the sizes and densities of these two media matched well; the binary media remained in complete segre-gation during regeneration by fluidization. Test results show that the filtration of the expanded perlite particle layer was characterized as "deep bed filtration." Filtration of the fine sand layer was "surface cake filtration." The expanded per-lite particle layer contributed about 90% to the bed dust capacity,but only about 20% to the total bed pressure drop,which increased the bed dust capacity ten fold compared to a single-layer bed of the same sand and the same total bed pressure drop. The dust cake on the surface of the fine sand layer raised the collection efficiencies to over 99.99%.

关键词： filtration granular bed filter particulate