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A new CFAR ship target detection method in SAR imagery

Acta Oceanologica Sinica 2010年第1期29卷 12-16页

作者： JI Yonggang zhang Jie MENG Jummin zhang Xi First institute of Oceanography State Oceanic Administration Qingdao 266061 China Key Laboratory of Marine Science and Numerical Modeling State Oceanic AdministrationQingdao 266061 China

Many ship target detection methods have been developed since it was verified that ship could be imaged with the space-based SAR systems. Most developed detection methods mostly emphasized ship detection rate but not computation time. By making use of the advantages of the K-distribution CFAR method and two-parameter CFAR method, a new CFAR ship target detection algorithm was proposed. In that new method, we use the K-distribution CFAR method to calculate a global threshold with a certain false-alarm rate. Then the threshold is applied to the whole SAR imagery to determine the possible ship target, pixcls, and a binary image is given as tile preliminary result. Mathematical morphological filter are used to filter the binary image. After that step, we use tile two-parameter CFAR method to detect the ship targets. In the step, the local sliding window only works in the possible ship target pixels of the SAR imagery. That step avoids the statistical calculation of the background pixels, so the method proposed can much improve the processing speed. In order to test the new method, two SAN imagery with different background were used, and the detection result shows that that method can work well in different background circumstances with high detection rate. Moreover, a synchronous ship detection experiment was carried out in Qingdao port in October 2., 2.05 to verify the new method and one ENVISAT ASAR imagery was acquired to detect ship targets. It can be concluded from the experiment that the new method not only has high detection rate, but also is time-consuining, and is suitable for the operational ship detection system.

关键词： ship target diction SAR. CFAR

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Anti-Seizure and Neuronal Protective Effects of Irisin in Kainic Acid-Induced Chronic Epilepsy Model with Spontaneous Seizures

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Neuroscience Bulletin 2022年第11期38卷 1347-1364页

作者： Jie Yu Yao Cheng Yaru Cui Yujie Zhai Wenshen zhang Mengdi zhang {2. Xin Jia Liang Xiaohong Pan Qiaoyun Wang Hongliu Sun School of Pharmaceutical Sciences Binzhou Medical UniversityYantai 264003China The Sixth Scientifc research Department Shandong Institute of Nonmetallic MaterialsJinan 250031China

An increased level of reactive oxygen species is a key factor in neuronal apoptosis and epileptic *** reportedly attenuates the apoptosis and injury induced by oxidative ***,we evaluated the effects of exogenous irisin in a kainic acid(KA)-induced chronic spontaneous epilepsy rat *** results indicated that exogenous irisin significantly attenuated the KA-induced neuronal injury,learning and memory defects,and *** treatment also increased the levels of brain-derived neurotrophic factor(BDNF)and uncoupling protein 2.UCP2.,which were initially reduced following KA ***,the specific inhibitor of UCP2.genipin)was administered to evaluate the possible protective mechanism of *** reduced apoptosis,neurodegeneration,and spontaneous seizures in rats treated with irisin were significantly reversed by genipin *** findings indicated that neuronal injury in KA-induced chronic epilepsy might be related to reduced levels of BDNF and ***,our results confirmed the inhibition of neuronal injury and epileptic seizures by exogenous *** protective effects of irisin may be mediated through the BDNF-mediated UCP2.*** results thus highlight irisin as a valuable therapeutic strategy against neuronal injury and epileptic seizures.

关键词： Epilepsy Seizure Irisin Genipin Neuronal injury

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Spatial distribution of surface energy fluxes over the Loess Plateau in China and its relationship with climate and the environment

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Science China Earth Sciences 2014年第9期57卷 2135-2147页

作者： zhang Qiang zhang Liang HUANG Jing zhang LiYang WANG wenyu SHA Sha institute of Arid Meteorology China Meteorological Administration Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province Key Open Laboratory of Arid Climatic Change and Disaster Reduction of China Meteorological Administration Meteorological Bureau of Gansu College of Atmospheric Sciences Lanzhou University Meteorological Bureau of Yongjia

China's Loess Plateau is located at the edge of the Asian summer monsoon in a transition zone of climate and ecology. In the Loess Plateau, climate and environments change along with space, which has an obvious impact on the spatial distribution of surface energy fluxes. Because of scarce land-surface observation sites and short observation time in this area, previous studies have failed to fully understand the land-surface energy balance characteristics over the entire the Loess Plateau and their effect mechanisms. In this paper, we first test the simulation ability of the Community Land Model(CLM) model by comparing its simulated data with observed data. Based on the simulation data for the Loess Plateau over the past thirty years, we then analyze the spatial distribution of surface energy fluxes and compare the pattern differences between the area averages for the driest year and wettest year. Furthermore, we analyze the relationship between the spatial distribution of the components of the surface energy balance with longitude, latitude, altitude, precipitation and temperature. The main results are as follows: the spatial distribution of surface energy fluxes are significantly different, with the surface net radiation and sensible heat flux increasing from south to north and latent heat flux and soil heat flux decreasing from southeast to northwest. The sensible heat flux at the driest point is nearly twice as high as that at the wettest point, whereas the latent heat flux and soil heat flux at the driest point are half as much as that at the wettest point. The impact of variations of annual precipitation on the components of the surface energy balance is also obvious, and the maximum magnitude of the changes to the sensible heat flux and latent heat flux is nearly 30%. To a certain extent, geographical factors(including longitude, latitude, and altitude) and climate factors(including temperature and precipitation) affect the surface energy fluxes. However, the

关键词： Loess Plateau components of surface energy balance spatial distribution climatic and geographical factors effect mechanism

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中文版8条目Morisky服药依从性量表在大骨节病治疗中的应用及信效度分析

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中华地方病学杂志 2024年第4期43卷 263-268页

作者：牛珲杨正军常虹邓兴星文金凤赵翊君张倩李雯钰张峰郭雄吴翠艳西安交通大学公共卫生学院国家卫生健康委员会微量元素与地方病重点实验室西安710061 陕西省地方病防治研究所大骨节病克山病防治研究室西安710003 陕西省地方病临床医学研究中心西安710004

目的评价中文版8条目Morisky服药依从性量表(MMAS-8)在大骨节病药物治疗中应用的信度和效度,探究大骨节病患者服药依从性的影响因素。方法2.2.年9月,在陕西省铜川市耀州区采用中文版MMAS-8调查12.例大骨节病患者服药依从性,并采用问卷... 详细信息

目的评价中文版8条目Morisky服药依从性量表(MMAS-8)在大骨节病药物治疗中应用的信度和效度,探究大骨节病患者服药依从性的影响因素。方法2.2.年9月,在陕西省铜川市耀州区采用中文版MMAS-8调查12.例大骨节病患者服药依从性,并采用问卷调查方式收集患者的性别、年龄、身高、体重、大骨节病临床分度、吸烟、饮酒、受教育程度以及是否患有慢性病等信息。利用Pearson相关分析各条目得分与总分的相关性。选用重测信度、分半信度系数、克隆巴赫系数(Cronbach′sα系数)评价中文版MMAS-8的信度,采用主成分最大方差旋转因子分析法评价其结构效度。采用多因素有序logistic回归分析大骨节病患者服药依从性影响因素。结果12.例患者中,服药依从性低者70例(58.3%),服药依从性中者41例(34.2.),服药依从性高者9例(7.5%)。中文版MMAS-8各条目得分与总分的相关系数均>0.40,重测信度为0.78,分半信度系数为0.66,Cronbach′sα系数为0.72.主成分最大方差旋转因子分析共提取2.公因子,累计方差贡献率为52.30%。多因素有序logistic回归分析显示,有饮酒习惯的患者较无饮酒习惯的患者服药依从性低(OR=0.2.,95%CI:0.07~0.83,P=0.02.),其余因素均未见相关性(均P>0.05)。结论中文版MMAS-8应用于大骨节病患者药物治疗评价具有良好的信度和效度。饮酒习惯与大骨节病患者服药依从性有关。

关键词：大骨节病中文版8条目Morisky服药依从性量表信效度分析影响因素

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Evaluation and impact factors of indoor and outdoor gas-phase nitrous acid under different environmental conditions

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Journal of Environmental Sciences 2020年第9期32卷 165-171页

作者： Yan Chen Weigang Wang Chaofan Lian Chao Peng wenyu zhang Junling Li Mingyuan Liu Bo Shi Xuefei Wang Maofa Ge State Key Laboratory for Structural Chemistry of Unstable and Stable Species Beijing National Laboratory for Molecular Sciences(BNLMS)CAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of ScienceXiamen 361021China

As an important indoor pollutant,nitrous acid(HONO) can contribute to the concentration of indoor OH radicals by photolysis via sunlight penetrating into indoor environments,thus affecting the indoor oxidizing *** order to investigate the concentration of indoor HONO and its impact factors,three different indoor environments and two different locations in urban and suburban areas were selected to monitor indoor and outdoor pollutants simultaneously,including HONO,NO,NO2.nitrogen oxides(NOx),O3,and particle mass *** general,the concentration of indoor HONO was higher than that *** the urban area,indoor HONO with high average concentration(7.10 ppbV) was well-correlated with the *** the suburban area,the concentration of indoor HONO was only about 1-2.ppbV,and had a good correlation with indoor relative *** was mainly attributed to the heterogeneous reaction of NO2.on indoor *** sunlight penetrating into indoor environments from outside had a great influence on the concentration of indoor HONO,leading to a concentration of indoor HONO close to that outdoors.

关键词： impact environments outdoor

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A paternal protein facilitates sperm RNA delivery to regulate zygotic development

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Science China(Life Sciences) 2023年第10期66卷 2342-2353页

作者： Dongdong Li Shijing Huang Yongping Chai Ruiqian Zhao Jing Gong Qiangfeng Cliff zhang Guangshuo Ou wenyu Wen Tsinghua-Peking Center for Life Sciences Beijing Frontier Research Center for Biological StructureMcGovern Institute for Brain ResearchSchool of Life Sciences and MOE Key Laboratory for Protein ScienceTsinghua UniversityBeijing 100084China Department of Neurosurgery Huashan Hospitalthe Shanghai Key Laboratory of Medical EpigeneticsInstitutes of Biomedical SciencesState Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain ScienceNational Center for Neurological DisordersSchool of Basic Medical SciencesFudan UniversityShanghai 200032China

Sperm contributes essential paternal factors,including the paternal genome,centrosome,and oocyte-activation signals,to sexual ***,it remains unresolved how sperm contributes its RNA molecules to regulate early embryonic ***,we show that the Caenorhabditis elegans paternal protein SPE-11 assembles into granules during meiotic divisions of spermatogenesis and later matures into a perinuclear structure where sperm RNAs *** reconstitute an SPE-11 liquid-phase scaffold in vitro and find that SPE-11 condensates incorporate the nematode RNA,which,in turn,promotes SPE-11 phase *** of SPE-11 does not affect sperm motility or fertilization but causes pleiotropic development defects in early embryos,and spe-11 mutant males reduce m RNA levels of genes crucial for an oocyte-to-embryo transition or embryonic *** results reveal that SPE-11 undergoes phase separation and associates with sperm RNAs that are delivered to oocytes during fertilization,providing insights into how a paternal protein regulates early embryonic development.

关键词： SPE-11 phase separation paternal factor early embryonic development

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In situ formation of ionically conductive nanointerphase on Si particles for stable battery anode

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Science China Chemistry 2021年第8期64卷 1417-1425页

作者： Xiaoxue Chen Gaofeng Ge wenyu Wang Bao zhang Jianjun Jiang Xuelin Yang Yuzhang Li Li Wang Xiangming He Yongming Sun Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan430074China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan430074China College of Electrical Engineering&New Energy Hubei Provincial Collaborative Innovation Center for New Energy MicrogridChina Three Gorges UniversityYichang443002China College of Materials and Chemical Engineering University of CaliforniaLos Angeles90095USA institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing100084China

Silicon(Si)is a promising anode candidate for next-generation lithium-ion batteries(LIBs)due to its high theoretical *** Si photovoltaic waste possesses good purity and high *** it as the raw material for battery anodes can synchronously solve the problem of solid waste pollution and enable high energy density LIBs.A critical issue impeding the practical application of Si is the undesirable side reactions at the electrolyte-particle interface and the resulting increase in impedance during ***,a Si-P core shell structure with chemical bonding at the Si-P interface is fabricated through a simple mechanical alloying reaction between red P and solar Si photovoltaic *** P nanoshell with thickness within 15 nm converts to Li3P during the initial lithiation process and maintains its phase on *** as-formed Li3P nanolayer functions as a stable,ionically conductive protective layer that reduces the direct contact between Si and electrolytes,and thus suppresses undesired side *** Si-P nanocomposite exhibits stable electrochemical cycling with a high reversible capacity of 1,178 mAh g^(−1)after 500 cycles at 1,2.0 mA g^(−1),as well as excellent rate capability(912.mAh g^(−1)at 2.C).With 15 wt%addition to graphite,a graphite/Si-P hybrid electrode shows a high overall reversible specific capacity of 447 mAh g^(−1)and 88.3%capacity retention after 100 cycles at high areal capacity of 2.64 mAh cm^(−2. at 100 mA g^(−1),indicating its promise as a drop-in anode in practical LIBs.

关键词： silicon anode Li3P interface stability lithium-ion batteries

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Experimental analysis on air-to-water sound transmission loss in shallow water

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Chinese Journal of Acoustics 2017年第2期36卷 217-230页

作者： zhang Lingshan PENG Zhaohui WANG Guangxu LUO wenyu State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of Sciences University of Chinese Academy of Sciences

The research of propagation characteristics of air-to-water sound transmission is of great importance to the detection of aerial targets from *** order to study the propagation characteristics of air-to-water sound transmission in shallow water,State Key Laboratory of Acoustics,institute of Acoustics,conducted an experiment in the South China Sea in March,*** the experiment,multi-frequency signals transmitted by a hooter hung on a research ship were received by an underwater hydrophone,and the distance between the hooter and the hydrophone was from 2.4 km to 9.8 km *** analyzing experimental data in this work,the experimental air-to-water transmission loss at frequencies12. Hz and 2.6 Hz is estimated up to 9.8 km in range,and its oscillation structure is *** wave-number integration approach is used to simulate theoretical air-to-water transmission losses,which are in good agreement with experimental values and to explain the experimental air-to-water sound transmission characteristics.

关键词： shallow underwater transmitted airborne evident excited processed aerial calculating receiver

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临床护士组织沉默影响因素的Meta分析

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全科护理 2024年第15期22卷 2785-2789页

作者：李岩王冠东冯星慧张文瑜孙娟新乡医学院护理学院 450000 河南省人民医院呼吸与危重症医学科、河南省护理医学重点实验室郑州大学人民医院 450003

目的:通过Meta分析,系统评价临床护士组织沉默的影响因素。方法:计算机检索PubMed、Web of Science、Embase、the Cochrane Library、中国知网、万方数据库、维普资源总库、中国生物医学文献数据库相关研究。根据纳入和排除标准筛选文献... 详细信息

目的:通过Meta分析,系统评价临床护士组织沉默的影响因素。方法:计算机检索PubMed、Web of Science、Embase、the Cochrane Library、中国知网、万方数据库、维普资源总库、中国生物医学文献数据库相关研究。根据纳入和排除标准筛选文献,并提取文献信息。采用美国卫生保健质量和研究机构推荐的横断面研究质量评价工具进行质量评价,应用RevMan 5.0进行Meta分析。结果:共检索到2.4篇文献,最终纳入10篇文献,均为中高等质量。Meta分析显示,临床护士组织沉默影响因素的合并相关系数及95%CI为工作年限[-0.09(-0.17,-0.01)]、年龄[0.2.(0.15,0.32.]、聘任形式[0.75(0.48,1.03)]、学历[-0.15(-0.2.,-0.01)]、职称[-0.32.-0.58,-0.07)]。结论:工作年限、年龄、聘任形式、学历及职称是临床护士组织沉默的影响因素,且研究结果较为稳健。

关键词：组织沉默临床护士影响因素 Meta分析

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基于SPH法的高速弹片侵彻液舱后衰减效应研究

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兵器装备工程学报 2020年第8期41卷 26-29页

作者：郭翔章红雨武汉第二船舶设计研究所

为研究鱼雷等近场水下爆炸时舰船防护液舱抗高速弹片侵彻的性能特性,基于SPH法构建高速弹片侵彻液舱数值模型,通过改变液舱宽度、外板厚度、有无液舱外板和弹片入射角度4个变量,分析弹片速度和冲击波压力的衰减效应。结果表明,液舱宽度... 详细信息

为研究鱼雷等近场水下爆炸时舰船防护液舱抗高速弹片侵彻的性能特性,基于SPH法构建高速弹片侵彻液舱数值模型,通过改变液舱宽度、外板厚度、有无液舱外板和弹片入射角度4个变量,分析弹片速度和冲击波压力的衰减效应。结果表明,液舱宽度和外板厚度的变化对弹片速度的衰减影响较小,但对冲击波压力的峰值和响应时间影响较大,而液舱外板和弹片入射角度对二者的影响都较大。

关键词：高速弹片侵彻液舱 SPH法冲击波压力衰减规律

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