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A background refinement method based on local density for hyperspectral anomaly detection

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Journal of Central South University 2018年第1期25卷 84-94页

作者： ZHAO chun-hui WANG Xin-peng YAO Xi-feng TIAN Ming-hua Information and Communication Engineering College Harbin Engineering University

For anomaly detection,anomalies existing in the background will affect the detection ***,a background refinement method based on the local density is proposed to remove the anomalies from *** this work,the local density is measured by its spectral neighbors through a certain radius which is obtained by calculating the mean median of the distance ***,a two-step segmentation strategy is *** first segmentation step divides the original background into two subsets,a large subset composed by background pixels and a small subset containing both background pixels and *** second segmentation step employing Otsu method with an aim to obtain a discrimination threshold is conducted on the small *** the pixels whose local densities are lower than the threshold are ***,to validate the effectiveness of the proposed method,it combines Reed-Xiaoli detector and collaborative-representation-based detector to detect *** are conducted on two real hyperspectral *** show that the proposed method achieves better detection performance.

关键词： hyperspectral imagery anomaly detection background refinement the local density

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论周恩来“过五关”的党建思想

中国青年政治学院学报 2005年第5期24卷 52-56页

作者：马化祥北京大学光华管理学院北京100871

周恩来同志提出党的领导干部要过“五关”,即思想关、政治关、社会关、亲属关、生活关,并以此作为加强党员党性修养的最基本要求,前两关属于思想、政治层面,以前虽经常强调,但在“五关”中又有其特定的涵义;后三关是在思想关和政治关的... 详细信息

周恩来同志提出党的领导干部要过“五关”,即思想关、政治关、社会关、亲属关、生活关,并以此作为加强党员党性修养的最基本要求,前两关属于思想、政治层面,以前虽经常强调,但在“五关”中又有其特定的涵义;后三关是在思想关和政治关的影响下,体现在工作和生活中具体的作风层面上。今天,我们重新认识“五关”论,对于共产党员尤其是党员领导干部加强自身党性修养,对于执政党加强自身建设,不断完善和提高执政水平具有十分重要的现实意义。

关键词：周恩来 “五关” 党性修养党的建设

Application of Bis(2-Ethylhexyl) Sulfosuccinate(AOT) /Isooctane Reverse Micellar System in Extraction of Sesame Residue Proteins

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Animal Husbandry and Feed Science 2010年第3期2卷 5-7,11页

作者： CHEN Xue-hong QIN Wei-dong ma Li-hua huaNG Yu-hua College of Food Engineering Xuzhou Institute of Technology Xuzhou 221008 China

[ Objective] To investigate the factors affecting sesame residue protein extraction and find the optimum extraction conditions, [Method ] Sesame residue proteins were extracted with bis（2-ethylhexyl）sulfosuocinate （AOT）/isooctane reverse micellar system. Orthogonal test was used to screen the optimum combination of four factors including sesame residue concentration, pre-extraction pH value, potassium chloride concentration and reverse extraction time. The yield of extracted sesame residue proteins was the indicator to evaluate the efficiency of process. E Result1 The optimum extraction conditions are as follows： sesame residue concentration： 0.06 g/ml; pre-extraction pH value, 3.0; potassium chloride concentration, 1.5 mol/L; and reverse extraction time, 20 min. In the optimum extraction conditions, the extraction rate was up to 86%. [ Coaclusion] Extraction of sesame residue proteins can be well performed with AOT/isooctane reverse micellar system.

关键词： Sesame residue' proteins Reverse micellar system Optimum conditions

钛表面激光熔覆NiCr-Ag复合涂层组织结构及空间摩擦学性能

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稀有金属材料与工程 2020年第4期49卷 1191-1199页

作者：郭纯陈丰魏宝丽张华安徽科技学院安徽蚌埠233000

利用激光熔覆技术在钛基材表面制备了NiCr-Ag复合涂层。用XRD、SEM和HRTEM分析了涂层的组成和组织结构,利用空间摩擦学系统对复合涂层在3种模拟空间环境(高真空、原子氧和紫外辐照)以及大气环境下的摩擦磨损性能进行了研究。采用SEM和ED... 详细信息

利用激光熔覆技术在钛基材表面制备了NiCr-Ag复合涂层。用XRD、SEM和HRTEM分析了涂层的组成和组织结构,利用空间摩擦学系统对复合涂层在3种模拟空间环境(高真空、原子氧和紫外辐照)以及大气环境下的摩擦磨损性能进行了研究。采用SEM和EDS对磨损后复合涂层和对偶钢球的形貌和元素面分布进行了分析,揭示了复合涂层在模拟空间环境及大气环境下摩擦磨损失效机理。结果表明:复合涂层在大气环境条件下的摩擦磨损性能优于在3种模拟空间环境下的摩擦磨损性能;真空下的辐照对复合涂层的摩擦磨损性能有显著的影响,辐照会增加涂层表面氧化;复合涂层在高真空、原子氧和紫外辐照模拟空间环境下的磨损机理为较严重的粘着磨损、磨粒磨损和塑性变形,在大气环境条件下的磨损机理主要为磨粒磨损。

关键词：空间摩擦激光熔覆磨损机理结构激光原位反应

菇渣用作无纺布容器育苗成型机配套基质的研究

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生态与农村环境学报 2010年第5期26卷 477-481页

作者：刘方春马海林马丙尧杜振宇段春华山东省林业科学研究院/山东省森林植被生态修复工程技术研究中心山东济南250014

为探讨菇渣在无纺布容器育苗成型技术中作为配套容器基质应用的可行性,研究了育苗成型机制备的菇渣（发酵后）和草炭容器基质的基本理化性质、盐分淋洗特征及其对火炬树和侧柏出苗及生长的影响。结果表明：菇渣基质的容重、通气状况与... 详细信息

为探讨菇渣在无纺布容器育苗成型技术中作为配套容器基质应用的可行性,研究了育苗成型机制备的菇渣（发酵后）和草炭容器基质的基本理化性质、盐分淋洗特征及其对火炬树和侧柏出苗及生长的影响。结果表明：菇渣基质的容重、通气状况与草炭基质之间无显著差异,pH值虽显著高于草炭基质,但适宜多数植物生长;相对于草炭基质,菇渣基质的持水能力不足,保肥性能较差;菇渣基质的适宜水分范围（36.1%~143.5%）明显小于草炭基质（41.9%~193.8%）,有效水绝对含量较低;菇渣基质的电导率（3.71 ***-1）虽高于安全育苗的临界值（≤2.6 ***-1）,但随着浇水次数的增加可逐渐降到安全值以下;菇渣基质的全氮、全磷和全钾含量显著高于草炭基质。在充足的水分和养分条件下,菇渣和草炭容器基质对侧柏和火炬树出苗及成活的影响基本一致,但菇渣基质对火炬树的育苗效果优于草炭基质。可见,只要保证充足水分,菇渣基质在无纺布容器育苗成型技术中可以替代草炭基质用于火炬树和侧柏的育苗。

关键词：菇渣草炭育苗成型机基质火炬树侧柏理化性质淋洗出苗生长

Sensitivity of seismic attenuation and dispersion to dynamic elastic interactions of connected fractures: Quasi-static finite element modeling study

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Petroleum Science 2023年第1期20卷 177-198页

作者： Yan-Xiao He Wen-Tao He Meng-Fan Zhang Jia-Liang Zhang Wei-hua Liu Xiao-Yi ma Gen-Yang Tang Shang-Xu Wang Guo-Fa Li Jun-Zhou Liu Xiang-Long Song State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development Beijing100083China Sinopec Key Laboratory of Seismic Elastic Wave Technology Beijing100083China State Key Laboratory of Petroleum Resources and Prospecting CNPC Key Lab of Geophysical ExplorationChina University of Petroleum(Beijing)Beijing102249China CNOOC(China)Co. Ltd.Hainan BranchHaikouHainan570311China PetroChina Dagang Oilfield Tianjin300280China Sinopec Geophysical Research Institute NanjingJiangsu211103China Sinopec Petroleum Exploration and Production Research Institute Beijing100083China Chinese Academy of Geological Sciences Beijing100037 China

Prediction of seismic attenuation and dispersion that are inherently sensitive to hydraulic and elastic properties of the medium of interest in the presence of mesoscopic fractures and pores,is of great interest in the characterization of fractured *** has been very difficult,however,considering that stress interactions between fractures and pores,related to their spatial distributions,tend to play a crucial role on affecting overall dynamic elastic properties that are largely *** thus choose to quantitatively investigate frequency-dependent P-wave characteristics in fractured porous rocks at the scale of a representative sample using a numerical scale-up procedure via performing finite element *** on 2-D numerical quasi-static experiments,effects of fracture and fluid properties on energy dissipation in response to wave-induced fluid flow at the mesoscopic scale are quantified via solving Biot's equations of *** show that numerical results are sensitive to some key characteristics of probed synthetic rocks containing unconnected and connected fractures,demonstrating that connectivity,aperture and inclination of fractures as well as fracture infills exhibit strong impacts on the two manifestations of WIFF mechanisms in the connected scenario,and on resulting total wave attenuation and phase ***,in turn,illustrates the importance of these two WIFF mechanisms in fractured rocks and thus,a deeper understanding of them may eventually allow for a better characterization of fracture systems using seismic ***,this presented work combines rock physics predictions with seismic numerical simulations in frequency domain to illustrate the sensitivity of seismic signatures on the monitoring of an idealized geologic CO_(2) sequestration in fractured *** simulation demonstrates that these two WIFF mechanisms can strongly modify seismic records and hence,indicating that incorporating the two energy dis

关键词： Attenuation and dispersion Rock physics Fractured media Frequency dependence Numerical study

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中国路网空间体系的分形结构及其区域差异

交通运输系统工程与信息 2008年第4期8卷 11-15页

作者：柏春广蔡先华东南大学交通学院南京210096

以分形理论为基础,借助于GIS工具,对中国三大经济地带及六大经济区的公路网、包含公路及铁路的路网分布的空间结构形态进行了分形研究,测定了各区域路网空间体系分布的Hausdarf维数,计算了各区域的路网覆盖深度值,并在同一尺度上作了比... 详细信息

以分形理论为基础,借助于GIS工具,对中国三大经济地带及六大经济区的公路网、包含公路及铁路的路网分布的空间结构形态进行了分形研究,测定了各区域路网空间体系分布的Hausdarf维数,计算了各区域的路网覆盖深度值,并在同一尺度上作了比较.结果表明,我国三大经济地带由东部→中部→西部,路网分维值逐渐降低,覆盖深度值逐渐增大;六大经济区的路网分维值,按华东、中南、西南、东北、华北、西北的顺序依次减小,覆盖深度值以华东经济区与中南经济区为最小,其余按东北、西南、华北、西北的顺序逐渐增加.在此基础上,建立了路网分布与区域经济之间的关联关系,以期为路网分析和交通规划提供新的思路和方法.

关键词：分形路网覆盖深度区域差异

Helicobacter pylori isolates from ethnic minority patients in Guangxi:Resistance rates,mechanisms,and genotype

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World Journal of Gastroenterology 2014年第16期20卷 4761-4770页

作者： Li-Juan Zhao Yan-Qiang huang Bing-Pu Chen Xiao-Qiang Mo Zan-Song huang Xiao-Feng huang Lian-Deng Wei Hong-Yu Wei Yuan-Hong Chen hua-Ying Tang Gan-Rong huang Yan-chun Qin Xiao-hua Li Lu-Yao Wang Department of Medical Microbiology and Immunology You Jiang Medical College for Nationalities

AIM: To investigate the rate of Helicobacter pylori (H. pylori) resistance to clarithromycin among ethnic minority patients in Guangxi, explore the underlying mechanisms, and analyze factors influencing genotype distr... 详细信息

关键词： Helicobacter pylori Antibiotic resistance Mechanism Clarithromycin Genotype

A Dose-response Meta-analysis of Egg Intake and Breast Cancer Risk

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Journal of Nutritional Oncology 2021年第2期6卷 81-89页

作者： Peng Wei ma Fei Fei Feng Zi Ang Shi Ke Di Xu Yuan Lin Zou Yan Li Wang Si Qi Ning chun hua Song Department of Toxicology College of Public HealthZhengzhou UniversityZhengzhou 450001HenanChina Department of Clinical Medicine Zhengzhou UniversityZhengzhou 450001HenanChina Department of Epidemiology and Statistics College of Public HealthZhengzhou UniversityZhengzhou 450001HenanChina

Aim Eggs are one of the most nutritious foods in nature,but there is no unified conclusion about the association between egg intake and breast cancer *** The PubMed and Web of Science databases for the literature on egg intake and breast cancer risk were searched for papers published during the last 10 *** were then filtered according to the inclusion and exclusion ***16.0 software was applied to perform a meta-analysis,the generalized least squares method and constrained cubic spline model were used to assess the dose-response trends between egg intake and breast cancer *** A total of 9 articles were included:6 case control studies and 3 cohort *** Newcastle-Ottawa scale(NOS)values of the included articles were all≥6 *** pooled relative risks(RR)of egg intake and breast cancer risk was 0.91(95%CI:0.69-1.19).The dose-response analysis showed a linear trend for egg intake and breast cancer risk(P=0.689).With every 10 g/day increase in egg intake,the incidence of breast cancer increased by 2%(RR=1.02,95%CI:0.99-1.05).However,these results were not statistically *** This meta-analysis found no significant association between egg intake and breast cancer.

关键词： Egg Breast cancer Dose-response Meta-analysis