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Development of anti-corrosive coating on AZ31 Mg alloy subjected to plasma electrolytic oxidation at sub-zero temperature 被引量:2
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作者 S.Fatimah M.P.Kamil +2 位作者 D.I.Han W.Al-Zoubi Y.G.Ko 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2022年第7期1915-1929,共15页
Plasma electrolytic oxidation(PEO)is a promising surface treatment to generate adherent and thick anti-corrosive coating on light-weight metals(Al,Mg,Ti,etc.)using an eco-friendly alkaline electrolyte.High energy plas... Plasma electrolytic oxidation(PEO)is a promising surface treatment to generate adherent and thick anti-corrosive coating on light-weight metals(Al,Mg,Ti,etc.)using an eco-friendly alkaline electrolyte.High energy plasma,however,inevitably generates porous structures that limit their practical performance.The present study proposes a straight-forward simple method by utilizing sub-zero electrolyte(268 K)to alter the plasma characteristics during formation of the protective coating on AZ31 Mg alloy via PEO with a comparison to the electrolyte at room temperature(298 K).In refrigerated electrolyte,the formation of micro-defects is suppressed relatively at the expense of low coating growth,which is measured to be twice lower than that at 298 K due to the temperature-dependent soft plasma discharges contributing to the development of the present coating.As a consequence,corrosion resistance of the sample processed at 268 K is superior to that of 298K,implying that the effect of coating thickness is less dominant than that of compactness.This phenomenon is interpreted in relation to the ionic movement and oxide solidification controlled by soft plasma discharges arising from the temperature gradient between electrolyte and surface of the substrate during PEO. 展开更多
关键词 AZ31 Mg alloy Plasma electrolytic oxidation Sub-zero electrolyte anti-corrosive coating Corrosion
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Bonding strength of graded anti-corrosive coatings of fluoroethylenepropylene (FEP)/polyphenylene sulfide (PPS) 被引量:1
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作者 Jie Bian Weiqiang Wang +1 位作者 Congsheng Guan Yonghui Zhao 《Journal of University of Science and Technology Beijing》 CSCD 2005年第6期572-576,共5页
Fluororesin-based anti-corrosive coatings including graded FEP/PPS were prepared on carbon steel by melt powder coating, the bonding strength of all coating systems was determined by the pull-off test. It is found tha... Fluororesin-based anti-corrosive coatings including graded FEP/PPS were prepared on carbon steel by melt powder coating, the bonding strength of all coating systems was determined by the pull-off test. It is found that the poor adhesion of fluororesin coatings to metallic substrates is improved obviously by the graded coating structure of FEP/PPS, and the bonding strength reaches up to 11.8 MPa for the five-layer system. Examination by electron probe microanalysis (EPMA) verifies that the distribution of main components is graded in the five-layer system, which is responsible for the enhancement of the interfacial bonding. 展开更多
关键词 FLUORORESIN anti-corrosive coating graded coating structure polyphenylene sulfide (PPS) bonding strength
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Development and progress in polymer materials foranti-corrosion and anti-fouling applications:A review
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作者 LYU Ren-jiang WANG Nan +5 位作者 ZHANG Rui-yong GAO Guang-tao LI Sheng-xi DUAN Ji-zhou HOU Bao-rong SAND Wolfgang 《Journal of Central South University》 SCIE EI CAS CSCD 2024年第10期3547-3569,共23页
Corrosion has always been a difficult problem that troubles and restricts the application and development ofengineering materials.By endowing coatings on metal surfaces with polymer material,it is possible to protect ... Corrosion has always been a difficult problem that troubles and restricts the application and development ofengineering materials.By endowing coatings on metal surfaces with polymer material,it is possible to protect othermaterials from factors including acid and alkali,water vapor,bacteria.Therefore,it is necessary to summarize theresearch progress of polymer materials in the field of pollution and corrosion prevention in recent years.This articlesummarizes four types of polymer materials with good weather resistance:polyurethane(PU),polydimethylsiloxane(PDMS),polyvinylidene fluoride(PVDF),and polyvinylidene chloride(PVDC).These four polymer materials aresuitable for making polymer anti-corrosion or anti-fouling materials and each has its own characteristics.PU can firmlyadhere to various substrates,effectively protecting and extending their lifespan,but the environmentally friendly varietiescurrently used,namely water-borne polyurethanes(WPU),generally have poor mechanical properties.PDMS is nontoxicand has excellent hydrophobicity,but its static anti-fouling ability is insufficient when applied in the field of antifouling.PVDF has good chemical resistance and high mechanical properties,good UV resistance making it suitable foroutdoor use like in the marine environment.However,PVDF lacks flexibility after molding and its manufacturing cost isrelatively high.PVDC has excellent water vapor barrier properties,but poor adhesion to metal material surfaces.Therefore,researchers need to modify these four polymers when using them to solve the problem of corrosion orbiofouling.The article will review the research progress of four types of polymers in recent years from the perspectivesof anti-corrosion,anti-fouling,and a strategy named as self-healing that is beneficial for protecting polymer surfacesfrom mechanical damage,and summarize the modification methods adopted by researchers when applying thesematerials.Finally,a summary of the application and the prospects of these polymer materials are presented. 展开更多
关键词 anti-corrosION POLYMER corrosion ANTI-FOULING SELF-HEALING
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The characteristics of negative corona discharge and radio interference at different altitudes based on coaxial wire-cylinder gap
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作者 何旺龄 魏宏宇 +6 位作者 张胤禄 刘永聪 刘云鹏 万保权 周阳 王延召 干喆渊 《Plasma Science and Technology》 SCIE EI CAS CSCD 2024年第2期77-85,共9页
The corona discharge from transmission lines in high-altitude areas is more severe than at lower altitudes. The radio interference caused thereby is a key factor to be considered when designing transmission lines. To ... The corona discharge from transmission lines in high-altitude areas is more severe than at lower altitudes. The radio interference caused thereby is a key factor to be considered when designing transmission lines. To study the influence of altitude on negative corona characteristics, an experimental platform comprising a movable small corona cage was established: experiments were conducted at four altitudes in the range of 1120-4320 m, and data on the corona current pulse and radio interference level of 0.8-mm diameter fine copper wire under different negative voltages were collected. The experimental results show that the average amplitude, repetition frequency and average current of the corona current pulse increase with increasing altitude. The dispersion of pulse amplitude increases with increase in altitude, while the randomness of the pulse interval decreases continuously. Taking the average current as an intermediate variable,the relationship between radio interference level and altitude is obtained. The result of this research has some significance for understanding the corona discharge characteristics of ultra-highvoltage lines. 展开更多
关键词 ALTITUDE negative corona corona current pulse radio interference level
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An Integrated Anti-Fouling and Anti-Corrosion Coating Enabled by rGO/AgNPs and Amphiphilic Networks
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作者 Shu Tian Jinli Zhang +6 位作者 Shuan Liu Jingyu Li Jibin Pu Yugang Hao Guobing Ying Qunji Xue Guangming Lu 《Engineering》 SCIE EI CAS CSCD 2024年第11期223-234,共12页
Marine corrosion and biofouling are challenges that affect marine industrial equipment,and protecting equipment with functional coatings is a simple and effective approach.However,it is extremely difficult to combine ... Marine corrosion and biofouling are challenges that affect marine industrial equipment,and protecting equipment with functional coatings is a simple and effective approach.However,it is extremely difficult to combine anti-corrosion and anti-fouling properties in a single coating.In this work,we combine reduced graphene oxide(rGO)/silver nanoparticles(AgNPs)with a hydrophilic polymer in a bio-based silicone-epoxy resin to create a coating with both anti-fouling and anti-corrosion properties.The excel-lent anti-fouling performance of the coating results from a ternary synergistic mechanism involving foul-ing release,contact inhibition,and a hydration effect,while the outstanding anti-corrosion performance is provided by a ternary synergistic anti-corrosion mechanism that includes a dense interpenetrating net-work(IPN)structure,a barrier effect,and passivation.The results show that the obtained coating pos-sesses superior anti-fouling activity against protein,bacteria,algae,and other marine organisms,as well as excellent anti-corrosion and certain self-healing properties due to its dynamic cross-linked net-work of rGO/AgNPs and the hydrophilic polymer.This work provides an anti-corrosion and anti-fouling integrated coating for marine industrial equipment. 展开更多
关键词 ANTI-FOULING anti-corrosION rGO/AgNPs Amphiphilic coating
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Electromagnetic Ion Beam Instability in the Solar Corona
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作者 Wen Liu Jin-Song Zhao +2 位作者 De-Jin Wu Huan-Yu Jia Si-Ming Liu 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2024年第2期171-179,共9页
Remote-sensing measurements indicate that heavy ions in the corona undergo an anisotropic and mass-charge dependent energization.A popular explanation to this phenomenon is the damping of the Alfven/ion cyclotron wave... Remote-sensing measurements indicate that heavy ions in the corona undergo an anisotropic and mass-charge dependent energization.A popular explanation to this phenomenon is the damping of the Alfven/ion cyclotron waves.In this paper,we propose that the ion beam instability can be an important source of the Alfven/ion cyclotron waves,and we study the excitation of the ion beam instability in the corona at the heliocentric distance~3R_(⊙)and the corresponding energy transfer process therein ba sed on plasma kinetic theory.The results indicate that the existence of the motionless heavy ions inhibits the ion beam instability.However,the anisotropic beams of heavy ions promote the excitation of the ion beam instability.Besides,the existence ofαbeams can provide a second energy source for exciting beam instability.However,when both the proton beam and the a beam reach the instability excitation threshold,the proton beam driven instability excites preferentially.Moreover,the excitation threshold of the Alfven/ion cyclotron instability driven by ion beam is of the local Alfven speed or even less in the corona. 展开更多
关键词 plasmas-instabilities-waves-Sun corona
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New Problems of Boiler Corrosion after Coupling Combustion of Coal and Biomass and Anti-Corrosion Technologies
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作者 Lei Wang Ziran Ma +4 位作者 Chunlin Zhao Jiali Zhou Hongyan Wang Ge Li Ningling Zhou 《Journal of Renewable Materials》 EI CAS 2024年第4期799-814,共16页
This study explores the corrosion issues arising from the coupled combustion of coal and biomass and proposes potential solutions.Biomass,as a renewable energy source,offers advantages in energy-saving and carbon redu... This study explores the corrosion issues arising from the coupled combustion of coal and biomass and proposes potential solutions.Biomass,as a renewable energy source,offers advantages in energy-saving and carbon reduction.However,the corrosive effects of alkali metal compounds,sulfur(S)and chlorine(Cl)elements in the ash after combustion cannot be underestimated due to the high volatile content of biomass fuels.We investigate the corrosion mechanisms,as well as the transfer of Cl and alkali metal elements during this process.Comparative corrosion analyses are conducted among coal-fired boilers,pure biomass boilers and boilers with coupled combustion.Various biomass types in co-firing are studied to understand different corrosion outcomes.The main factors influencing corrosion include the physicochemical properties of biomass feedstock,furnace temperature and heating surface materials,with the chemical composition and ash content of biomass playing a dominant role.Currently,the methods used for anti-corrosion include water washing pretreatment of biomass feedstock,application of novel alloys and coatings and the development of additives to inhibit fouling,ash deposition and corrosion.Efficient inhibitors are economical and easy to produce.Additionally,biomass can be converted into biomass gasification gas,although challenges related to tar still need to be addressed. 展开更多
关键词 BIOMASS coupled combustion corrosion mechanism anti-corrosion measures
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Observation of Standing Slow Magneto-acoustic Waves in a Flaring Active Region Corona Loop
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作者 A.Abedini 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2024年第10期170-179,共10页
Intensity fluctuations are frequently observed in different regions and structures of the solar corona.These fluctuations may be caused by magneto-hydrodynamic(MHD)waves in coronal plasma.MHD waves are prime candidate... Intensity fluctuations are frequently observed in different regions and structures of the solar corona.These fluctuations may be caused by magneto-hydrodynamic(MHD)waves in coronal plasma.MHD waves are prime candidates for the dynamics,energy transfer,and anomalous temperature of the solar corona.In this paper,analysis is conducted on intensity and temperature fluctuations along the active region coronal loop(NOAA AR 13599)near solar flares.The intensity and temperature as functions of time and distance along the loop are extracted using images captured by the Atmospheric Imaging Assembly(AIA)instrument onboard the Solar Dynamics Observatory(SDO)space telescope.To observe and comprehend the causes of intensity and temperature fluctuations,after conducting initial processing,and applying spatial and temporal frequency filters to data,enhanced distance-time maps of these variables are drawn.The space-time maps of intensities show standing oscillations at wavelengths of 171,193,and 211A with greater precision and clarity than earlier findings.The amplitude of these standing oscillations(waves)decreases and increases over time.The average values of the oscillation period,damping time,damping quality,projected wavelength,and projected phase speed of standing intensity oscillations are in the range of 15-18 minutes,24-31 minutes,1.46″-2″,132″-134″,and 81-100 km s^(-1),respectively.Also,the differential emission measure peak temperature values along the loop are found in the range of 0.51-3.98 MK,using six AIA passbands,including 94,131,171,193,211,and 335?.Based on the values of oscillation periods,phase speeds,damping time,and damping quality,it is inferred that the fluctuations in intensity are related to standing slow magneto-acoustic waves with weak damping. 展开更多
关键词 magnetohydrodynamics(MHD) waves Sun:corona Sun:atmosphere Sun:flares
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Non-thermal atmospheric-pressure positive pulsating corona discharge in degradation of textile dye Reactive Blue 19 enhanced by Bi_(2)O_(3) catalyst
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作者 Milica PETROVIC Dragan RADIVOJEVIC +4 位作者 Sasa RANCEV Nena VELINOV Milos KOSTIC Danijela BOJIC Aleksandar BOJIC 《Plasma Science and Technology》 SCIE EI CAS CSCD 2024年第2期104-113,共10页
In this work,monoclinic Bi_(2)O_(3) was applied for the first time,to the best of our knowledge,as a catalyst in the process of dye degradation by a non-thermal atmospheric-pressure positive pulsating corona discharge... In this work,monoclinic Bi_(2)O_(3) was applied for the first time,to the best of our knowledge,as a catalyst in the process of dye degradation by a non-thermal atmospheric-pressure positive pulsating corona discharge.The research focused on the interaction of the plasma-generated species and the catalyst,as well as the role of the catalyst in the degradation process.Plasma decomposition of the anthraquinone reactive dye Reactive Blue 19(RB 19) was performed in a selfmade reactor system.Bi_(2)O_(3) was prepared by electrodeposition followed by thermal treatment,and characterized by x-ray diffraction,scanning electron microscopy and energy-dispersive xray techniques.It was observed that the catalyst promoted decomposition of plasma-generated H_(2)O_(2) into ·OH radicals,the principal dye-degrading reagent,which further attacked the dye molecules.The catalyst improved the decolorization rate by 2.5 times,the energy yield by 93.4%and total organic carbon removal by 7.1%.Excitation of the catalyst mostly occurred through strikes by plasma-generated reactive ions and radical species from the air,accelerated by the electric field,as well as by fast electrons with an energy of up to 15 eV generated by the streamers reaching the liquid surface.These strikes transferred the energy to the catalyst and created the electrons and holes,which further reacted with H_(2)O_(2) and water,producing ·OH radicals.This was indentified as the primary role of the catalyst in this process.Decolorization reactions followed pseudo first-order kinetics.Production of H_(2)O_(2) and the dye degradation rate increased with increase in the input voltage.The optimal catalyst dose was 500 mg·dm^(-3).The decolorization rate was a little lower in river water compared with that in deionized water due to the side reactions of ·OH radicals with organic matter and inorganic ions dissolved in the river water. 展开更多
关键词 corona RB 19 Bi_(2)O_(3) CATALYST DEGRADATION
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End-to-end computational design for an EUV solar corona multispectral imager with stray light suppression
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作者 Jinming Gao Yue Sun +6 位作者 Yinxu Bian Jilong Peng Qian Yu Cuifang Kuang Xiangzhao Wang Xu Liu Xiangqun Cui 《Astronomical Techniques and Instruments》 CSCD 2024年第1期31-41,共11页
An extreme ultraviolet solar corona multispectral imager can allow direct observation of high temperature coronal plasma,which is related to solar flares,coronal mass ejections and other significant coronal activities... An extreme ultraviolet solar corona multispectral imager can allow direct observation of high temperature coronal plasma,which is related to solar flares,coronal mass ejections and other significant coronal activities.This manuscript proposes a novel end-to-end computational design method for an extreme ultraviolet(EUV)solar corona multispectral imager operating at wavelengths near 100 nm,including a stray light suppression design and computational image recovery.To suppress the strong stray light from the solar disk,an outer opto-mechanical structure is designed to protect the imaging component of the system.Considering the low reflectivity(less than 70%)and strong-scattering(roughness)of existing extreme ultraviolet optical elements,the imaging component comprises only a primary mirror and a curved grating.A Lyot aperture is used to further suppress any residual stray light.Finally,a deep learning computational imaging method is used to correct the individual multi-wavelength images from the original recorded multi-slit data.In results and data,this can achieve a far-field angular resolution below 7",and spectral resolution below 0.05 nm.The field of view is±3 R_(☉)along the multi-slit moving direction,where R☉represents the radius of the solar disk.The ratio of the corona's stray light intensity to the solar center's irradiation intensity is less than 10-6 at the circle of 1.3 R_(☉). 展开更多
关键词 EUV solar corona imager Curved grating Stray light suppression Computational multispectral imaging
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Corona渲染技术在室内效果图仿真制作中的应用教学——以“教研室办公空间”效果图制作为例
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作者 冯韬 周肖 《广西教育》 2024年第3期164-168,共5页
Corona是一款建筑可视化渲染器,可作为插件集成在3ds Max中,它渲染设置简单,可在浮动视口开启交互式渲染并实时观察渲染结果,可以渲染出照片级写实的室内效果图。以“教研室办公空间”Corona渲染为例,基于3ds Max通过硬装材质赋予、硬... Corona是一款建筑可视化渲染器,可作为插件集成在3ds Max中,它渲染设置简单,可在浮动视口开启交互式渲染并实时观察渲染结果,可以渲染出照片级写实的室内效果图。以“教研室办公空间”Corona渲染为例,基于3ds Max通过硬装材质赋予、硬装场景灯光设置、硬装场景摄影机创建及视口设置,完成软装和渲染输出,从而阐明Corona渲染器在室内设计项目、室内设计专业教学中的应用,为其他室内效果图仿真提供技术参考。 展开更多
关键词 效果图 仿真 corona渲染
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基于Corona和Spot影像的近40年黑土典型区侵蚀沟动态变化 被引量:35
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作者 闫业超 张树文 岳书平 《资源科学》 CSSCI CSCD 北大核心 2006年第6期154-160,共7页
沟状侵蚀是我国东北黑土区一种比较常见的土壤侵蚀类型。当前国内外学者对侵蚀沟动态变化的研究多采用GPS或摄影测量的方法监测某些侵蚀沟的短期变化,由于缺少早期高分辨率的卫星影像,对于较大时空尺度上侵蚀沟分布格局变化的研究很少... 沟状侵蚀是我国东北黑土区一种比较常见的土壤侵蚀类型。当前国内外学者对侵蚀沟动态变化的研究多采用GPS或摄影测量的方法监测某些侵蚀沟的短期变化,由于缺少早期高分辨率的卫星影像,对于较大时空尺度上侵蚀沟分布格局变化的研究很少报道。本文选择克拜东部地区作为典型区,以1965年的美国高分辨率侦察卫星Corona影像和2005年的Spot-5卫星影像为主要数据源,结合野外实地调查,建立了黑土区侵蚀沟的遥感解译标志,阐述了不同类型侵蚀沟的遥感影像特征,通过对遥感影像的人机交互解译,获取了克拜东部地区1965年和2005年两个时期的侵蚀沟分布图,在此基础上,探讨了1965年以来克拜东部黑土区侵蚀沟分布的格局变化和区域差异。研究结果表明:近40年来克拜东部侵蚀沟密度高值区范围不断扩大,且呈集中连片分布趋势;沿通垦河分水岭两侧受地貌发育自然过程的影响,侵蚀沟密度变化存在明显的东西差异;土地利用方式的转变是促成侵蚀沟形成的重要因素,特别是林地向耕地和草地的转化过程中,侵蚀沟密度迅速增加。 展开更多
关键词 黑土 侵蚀沟 克拜地区 corona影像 动态变化
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一类具有脉冲干预措施的COVID-19模型的稳定性分析
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作者 王来全 夏米西努尔·阿布都热合曼 《山东理工大学学报(自然科学版)》 CAS 2025年第1期46-51,共6页
建立了一类对易感人群实施脉冲干预措施的COVID-19模型,得出了模型的基本再生数R_(0)和无病周期解。当R_(0)<1时,根据脉冲微分不等式和Lyapunov函数分析了无病周期解的全局稳定性,并数值模拟了这一结论。最后,探讨了脉冲预防策略在CO... 建立了一类对易感人群实施脉冲干预措施的COVID-19模型,得出了模型的基本再生数R_(0)和无病周期解。当R_(0)<1时,根据脉冲微分不等式和Lyapunov函数分析了无病周期解的全局稳定性,并数值模拟了这一结论。最后,探讨了脉冲预防策略在COVID-19传染病预防中的效果。 展开更多
关键词 新型冠状病毒肺炎 脉冲干预措施 基本再生数 渐近稳定
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基于Corona和Spot-5影像的图们江下游敬信湿地变化研究 被引量:13
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作者 刘志锋 朱卫红 +3 位作者 南颖 森本幸裕 王琪 赵洋 《湿地科学》 CSCD 2009年第3期237-242,共6页
采用1964年的Corona影像和2004年的Spot-5影像作为数据源,结合"3S"技术与实地考查资料,对图们江下游敬信湿地信息进行了提取与分类,分别得到了研究区1964年和2004年的湿地分类图;通过建立研究区的湿地动态变化特征模型,从各... 采用1964年的Corona影像和2004年的Spot-5影像作为数据源,结合"3S"技术与实地考查资料,对图们江下游敬信湿地信息进行了提取与分类,分别得到了研究区1964年和2004年的湿地分类图;通过建立研究区的湿地动态变化特征模型,从各类型湿地的面积变化和斑块变化两个角度,研究敬信湿地的变化特征及其成因。结果表明,研究区各类型湿地在气候变化、人类活动等因素的影响下发生了不同程度的变化,与1964年相比,2004年研究区人工湿地面积增加了16.923km2,这主要是修建龙山水库以及水田、养鱼池和孵化池面积大量增加所致;而自然湿地受到严重破坏,面积减少了17.33km2,河流和沼泽面积都减少了50%以上。研究区河流的斑块数急剧减少,沼泽湿地的斑块破碎化程度加剧,河流和沼泽湿地的斑块分维值明显下降,大面积沼泽被开发成水田,这两种湿地的空间自我相似性逐渐变差。研究区部分湖泊被开发利用,人为束水使得水面面积扩大,当地居民为了发展经济,在湖泊中从事鱼类养殖以及用湖泊水进行农业灌溉等活动,研究区人类活动干扰日趋严重。 展开更多
关键词 敬信湿地 变化 图们江下游 corona影像 Spot-5影像
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Corona Mortis血管解剖学研究及其临床意义 被引量:7
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作者 洪华兴 陈海啸 +2 位作者 洪正华 潘志军 林列 《中国骨伤》 CAS 2006年第6期355-357,共3页
目的:探讨闭孔血管和髂外血管在腹股沟区的分支,为减少髂腹股沟入路术中出血提供解剖学基础。方法:对25具新鲜中国成人尸体标本共50侧半骨盆进行解剖学研究,观测闭孔血管和髂外血管在腹股沟区的分支及其吻合支(CoronaMortis血管)的大小... 目的:探讨闭孔血管和髂外血管在腹股沟区的分支,为减少髂腹股沟入路术中出血提供解剖学基础。方法:对25具新鲜中国成人尸体标本共50侧半骨盆进行解剖学研究,观测闭孔血管和髂外血管在腹股沟区的分支及其吻合支(CoronaMortis血管)的大小、出现率、吻合血管行径和吻合血管至耻骨联合的距离。结果:72%(36侧)耻骨上支表面至少存在1条血管吻合支,其中28%(14侧)存在2条或3条血管吻合支,24%(12侧)同时存在动脉吻合支和静脉吻合支。耻骨上支表面的血管吻合支平均直径2.6mm(2.0~4.2mm)。血管吻合支紧贴耻骨上支或髂耻隆起,几乎垂直地下行于髋臼窝壁或耻骨支后方,经闭膜管出盆腔,血管吻合支与耻骨联合的平均距离52mm(38~68mm)。在此区域手术以及髋臼或骨盆前环骨折极易损伤CoronaMortis血管。结论:闭孔血管和髂外血管的吻合支较粗,出现率高,位于耻骨上支表面。髂腹股沟手术入路应特别注意CoronaMortis血管的存在。 展开更多
关键词 解剖学 corona Mortis血管 髂骨 血管
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基于CORONA影像的浅层地层信息定量提取 被引量:9
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作者 陈宁华 汪新 杨树锋 《浙江大学学报(工学版)》 EI CAS CSCD 北大核心 2007年第4期662-667,共6页
利用解密的美国CORONA卫星影像,在库车冲断褶皱带,开展大面积地表构造调查,获取地区的地表产状.通过建立有理函数模型(rational function model,RFM)校正CORONA影像的全景变形,利用JX-4C数字摄影测量系统进行CORONA影像的立体观测和测量... 利用解密的美国CORONA卫星影像,在库车冲断褶皱带,开展大面积地表构造调查,获取地区的地表产状.通过建立有理函数模型(rational function model,RFM)校正CORONA影像的全景变形,利用JX-4C数字摄影测量系统进行CORONA影像的立体观测和测量,确定岩层面的高程值,并采用三点法在MATLAB软件中计算岩层的倾角和走向,获取地表产状.通过和野外实测数据对比,测量误差小于3°,满足了构造定量解析的精度要求.应用获取的构造产状结合二维地震反射资料,根据断层相关褶皱原理定量地提取库车地区褶皱和断层的几何学特征. 展开更多
关键词 corona影像 库车冲断褶皱带 定量构造分析
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一些与圈图构成的Corona图的b-染色 被引量:5
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作者 吕闯 王科伦 +1 位作者 张若东 潘淑霞 《兰州理工大学学报》 CAS 北大核心 2016年第6期151-155,共5页
图G的一个(k)b-染色是一个正常k染色,且满足在每一个色类中至少存在一个顶点,使得该顶点与其他每个色类中至少一个顶点是邻接的.图G的b-染色数用b(G)来表示,b(G)为最大的正整数k,且用k种颜色能够对G进行b-染色.对于任意的k:χ(G)≤k≤b(... 图G的一个(k)b-染色是一个正常k染色,且满足在每一个色类中至少存在一个顶点,使得该顶点与其他每个色类中至少一个顶点是邻接的.图G的b-染色数用b(G)来表示,b(G)为最大的正整数k,且用k种颜色能够对G进行b-染色.对于任意的k:χ(G)≤k≤b(G),若用k种颜色能对图G进行b-染色,称图G是b-连续.通过设计具体b-染色方案,研究了Corona图CnoPm、CnoK1,m以及CnoWm+1的m-度与b-染色数,且证明这些图都是b-连续的. 展开更多
关键词 b-染色 b-染色数 b-连续 m-度 corona
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一些特殊Corona图的b-连续性 被引量:1
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作者 吕闯 王科伦 +1 位作者 张若东 潘淑霞 《工程数学学报》 CSCD 北大核心 2018年第1期69-78,共10页
图G的b-染色是一个正常顶点染色,且在每两个色类之间至少存在一条边.图G的b-染色数是最大的整数k,满足用k种颜色能对G进行b-染色,记为b(G).一个图G称为b-连续的当且仅当对于每个正整数k,χ(G)≤k≤b(G),图G存在一个(k)b-染色.本文根据Co... 图G的b-染色是一个正常顶点染色,且在每两个色类之间至少存在一条边.图G的b-染色数是最大的整数k,满足用k种颜色能对G进行b-染色,记为b(G).一个图G称为b-连续的当且仅当对于每个正整数k,χ(G)≤k≤b(G),图G存在一个(k)b-染色.本文根据Corona图的结构性质,通过设计具体染色方案的方法,证明了一些特殊Corona图的b-连续性. 展开更多
关键词 b-染色 b-染色数 b-连续 m-度 corona
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Corona图P_noF_(1,m)、C_noC_m与C_noF_(1,m)的b-染色数 被引量:1
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作者 吕闯 王科伦 +1 位作者 潘淑霞 牛新宇 《兰州理工大学学报》 CAS 北大核心 2017年第4期162-167,共6页
在图G=(V,E)的一个正常染色{V_1,V_2,…,V_k}中,若i,j,1≤i≠j≤k,■u∈V_i,v∈V_j,使得uv∈E,称该染色为b-染色.令b(G)=max{k|V_1,V_2,…,V_k:i,j,1≤i≠j≤k,■u∈V_i,v∈V_j,uv∈E},称b(G)为图G的b-染色数.一个图G是b-连续的,如... 在图G=(V,E)的一个正常染色{V_1,V_2,…,V_k}中,若i,j,1≤i≠j≤k,■u∈V_i,v∈V_j,使得uv∈E,称该染色为b-染色.令b(G)=max{k|V_1,V_2,…,V_k:i,j,1≤i≠j≤k,■u∈V_i,v∈V_j,uv∈E},称b(G)为图G的b-染色数.一个图G是b-连续的,如果k:χ(G)≤k≤b(G),用k种颜色可实现对G进行b-染色.通过构造特殊染色方案,研究了Corona图P_noF_(1,m)、C_noC_m与CnoF_(1,m)的b-染色数与b-连续性. 展开更多
关键词 染色数 b-染色 b-染色数 b-连续 m-度 corona
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几类Corona图的b-染色数 被引量:2
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作者 吕闯 王科伦 《工程数学学报》 CSCD 北大核心 2018年第4期445-456,共12页
设{V_1,V_2,···,V_k}为图G=(V,E)的一个正常顶点染色,满足对任意的i,j:1≤i≠j≤k,存在于u∈V_i,v∈V_j,使得uv∈E,称该点染色为G的一个b-染色.一个图G的b-染色数是最大的整数k,满足用k种颜色能对G进行b-染色,用b(G)来表... 设{V_1,V_2,···,V_k}为图G=(V,E)的一个正常顶点染色,满足对任意的i,j:1≤i≠j≤k,存在于u∈V_i,v∈V_j,使得uv∈E,称该点染色为G的一个b-染色.一个图G的b-染色数是最大的整数k,满足用k种颜色能对G进行b-染色,用b(G)来表示.如果对任意的k:χ(G)≤k≤b(G),图G都存在一个(k)b-染色{V_1,V_2,···,V_k},称G是b-连续的.根据Corona图的结构特点,设计循环染色方案,通过对Corona图中两种类型的顶点进行循环染色,得出几类Corona图的b-染色数等于其m-度,且这些Corona图满足b-连续性. 展开更多
关键词 b-染色 b-染色数 b-连续 m-度 corona 循环染色
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