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Recent advances in film cooling enhancement:A review 认领
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作者 Jingzhou ZHANG Shengchang ZHANG +1 位作者 Chunhua WANG Xiaoming TAN 《中国航空学报:英文版》 SCIE EI CAS CSCD 2020年第4期1119-1136,共18页
Film cooling is an indispensable scheme in the design of highly-efficient cooling configurations to satisfy the thermal protection requirement of turbine hot section components.During the last few decades,vast efforts... Film cooling is an indispensable scheme in the design of highly-efficient cooling configurations to satisfy the thermal protection requirement of turbine hot section components.During the last few decades,vast efforts have been paid on the discrete-hole film cooling enhancement.In this paper,some of the recent literatures related to the passive strategies(such as shaped film cooling holes,upstream ramps,shallow trenches,mesh-fed slots)and the active strategies(such as the use of pulsation modulating device or plasma actuator)for film cooling enhancement are surveyed,with the aim at presenting an updated overview about the state of the art in advanced film cooling.In addition,some challenging issues are also outlined to motivate further investigations in such a broad topic. 展开更多
关键词 Active strategy Cooling capacity Discrete-hole film cooling Film cooling enhancement Jet-in-crossflow Passive strategy
Surface removal of a copper thin film in an ultrathin water environment by a molecular dynamics study 认领
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作者 Junqin SHI Liang FANG +3 位作者 Kun SUN Weixiang PENG Juan GHEN Meng ZHANG 《摩擦:英文版》 SCIE CSCD 2020年第2期323-334,共12页
The surface planarity and asperity removal behavior on atomic scale in an ultrathin water environment were studied for a nanoscale process by molecular dynamics simulation.Monolayer atomic removal is achieved under bo... The surface planarity and asperity removal behavior on atomic scale in an ultrathin water environment were studied for a nanoscale process by molecular dynamics simulation.Monolayer atomic removal is achieved under both noncontact and monoatomic layer contact conditions with different water film thicknesses.The newly formed surface is relatively smooth without deformed layers,and no plastic defects are present in the subsurface.The nanoscale processing is governed by the interatomic adhering action during which the water film transmits the loading forces to the Cu surface and thereby results in the migration and removal of the surface atoms.When the scratching depth≥0.5 nm,the abrasive particle squeezes out the water film from the scratching region and scratches the Cu surface directly.This leads to the formation of trenches and ridges,accumulation of chips ahead of the particles,and generation of dislocations within the Cu substrate.This process is mainly governed by the plowing action,leading to the deterioration of the surface quality.This study makes the"0 nm planarity,0 residual defects,and 0 polishing pressure"in a nanoscale process more achievable and is helpful in understanding the nanoscale removal of materials for developing an ultra-precision manufacture technology. 展开更多
关键词 surface removal monoatomic adhesion copper thin film ultrathin water film
电影课将助推未来优秀人才成长 认领
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作者 雷祯孝 《决策与信息》 2020年第6期59-64,共6页
21世纪国际竞争的实质是人才竞争,能否培育各行各业杰出的专业人才、管理人才,是人才竞争的重要组成部分。经过20年的理论探索与学校实验,电影课已显示出吸引学生兴趣、培养学生行动与思考能力的明显优势,这一现象已被日本等国关注和借... 21世纪国际竞争的实质是人才竞争,能否培育各行各业杰出的专业人才、管理人才,是人才竞争的重要组成部分。经过20年的理论探索与学校实验,电影课已显示出吸引学生兴趣、培养学生行动与思考能力的明显优势,这一现象已被日本等国关注和借鉴。与此同时,电影课在培育我国未来优秀人才进程中大有可为。要围绕全心全意为人民这一中心,增加各类教育中培育价值理念、文化精神的课程比例,探索有效的影视教育实现形式,为培育未来我国各行各业的优秀人才作出贡献。 展开更多
关键词 电影 电影课 优秀人才 继承人仿生学
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流媒体时代受众对电影观看形式改变——传统影视产业的自救与发展 认领
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作者 郎轶媛 《中国有线电视》 2020年第7期815-817,共3页
在数字技术、互联网媒介技术的发展下人类社会进入到多元化信息、快节奏生活的新媒体时代,在时代的发展变化下电影不管是从拍摄方式还是消费方式等均发生了深刻变化,数字拍摄技术的进步提升了电影摄制技术的提升,数码成像技术使得电影... 在数字技术、互联网媒介技术的发展下人类社会进入到多元化信息、快节奏生活的新媒体时代,在时代的发展变化下电影不管是从拍摄方式还是消费方式等均发生了深刻变化,数字拍摄技术的进步提升了电影摄制技术的提升,数码成像技术使得电影领域产生了一次美学革命。碟片、电视播映、网络下载等渠道亦开辟了电影消费除传统影院放映的另一窗口,在这样的背景下传统院线电影发展遇到新的挑战和冲击。 展开更多
关键词 流媒体时代 电影 观看形式 转变 传统影视产业
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Magnetic field enhanced radio frequency ion source and its application for Si-incorporation diamond-like carbon film preparation 认领
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作者 殷冀平 王庆 +3 位作者 吴鑫龙 程春玉 巴德纯 蔺增 《等离子体科学与技术:英文版》 SCIE EI CAS CSCD 2020年第2期79-86,共8页
Various ion sources are key components to prepare functional coatings,such as diamond-like carbon(DLC)films.In this article,we present our trying of surface modification on basis of Si-incorporation diamond-like carbo... Various ion sources are key components to prepare functional coatings,such as diamond-like carbon(DLC)films.In this article,we present our trying of surface modification on basis of Si-incorporation diamond-like carbon(Si-DLC)produced by a magnetic field enhanced radio frequency ion source,which is established to get high density plasma with the help of magnetic field.Under proper deposition process,a contact angle of 111°hydrophobic surface was achieved without any surface patterning,where nanostructure SiC grains appeared within the amorphous microstructure.The surface property was influenced by ion flow parameters as well as the resultant surface microstructure.The magnetic field enhanced radio frequency ion source developed in this paper was useful for protective film applications. 展开更多
关键词 magnetic field ENHANCED radio frequency ion source Si-incorporation DIAMOND-LIKE carbon FILM microstructure HYDROPHOBICITY protective FILM
文章速递不同板材对鱼鳞明胶膜性质的影响 认领
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作者 喻弘 李发彩 +3 位作者 彭春 张佳诚 易雅琪 喻鹏 《食品工业》 CAS 北大核心 2020年第8期136-139,共4页
选择PC板(聚碳酸酯板)、PoM板(聚甲醛板)、亚克力板、环氧板、PP板(聚丙烯板)、ABS板(丙烯腈-丁二烯-苯乙烯共聚物)6种板材作为铺板的材料制备鱼鳞明胶膜,研究不同板材对鱼鳞明胶膜的性质的影响,以期筛选出最适合制备鱼鳞明胶膜的板材... 选择PC板(聚碳酸酯板)、PoM板(聚甲醛板)、亚克力板、环氧板、PP板(聚丙烯板)、ABS板(丙烯腈-丁二烯-苯乙烯共聚物)6种板材作为铺板的材料制备鱼鳞明胶膜,研究不同板材对鱼鳞明胶膜的性质的影响,以期筛选出最适合制备鱼鳞明胶膜的板材。结果表明,不同板材制备的鱼鳞明胶膜的吸水率无显著性差异;PC板和ABS板制备的鱼鳞明胶膜的透过率较低;PP板、PoM板制备的鱼鳞明胶膜的抗拉强度和最大伸长率均较高;扫描电镜图片表明PP板制备的鱼鳞明胶膜的表面和断面较为光滑平整。采用PP板制备的鱼鳞明胶膜的各项理化指标均较好,因此宜选用PP板制备鱼鳞明胶蛋白膜。 展开更多
关键词 鱼鳞 明胶 板材 扫描电镜
文章速递离子掺杂氧化锌自清洁薄膜的制备及亲水性研究 认领
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作者 潘林 赵磊 韩洪兴 《新乡学院学报》 2020年第9期16-19,24,共5页
以醋酸锌为前驱体,采用溶胶-凝胶法制备了ZnO薄膜,采用Fe^3+离子对其掺杂改性,考察拉膜层数、Fe^3+离子掺杂浓度等因素对ZnO薄膜结构和性能的影响。结果表明:(1)增加拉膜次数能够降低ZnO薄膜的透光性和亲水性;(2)拉膜次数对ZnO薄膜透光... 以醋酸锌为前驱体,采用溶胶-凝胶法制备了ZnO薄膜,采用Fe^3+离子对其掺杂改性,考察拉膜层数、Fe^3+离子掺杂浓度等因素对ZnO薄膜结构和性能的影响。结果表明:(1)增加拉膜次数能够降低ZnO薄膜的透光性和亲水性;(2)拉膜次数对ZnO薄膜透光率的影响不大;(3)掺入Fe^3+离子能有效改善ZnO薄膜的亲水性;(4)随着Fe^3+离子掺杂浓度的增加,ZnO薄膜的接触角呈先减小再增大趋势,当Fe^3+离子掺杂浓度为0.02 mol/L时,ZnO薄膜的接触角最小。 展开更多
关键词 氧化锌 薄膜 掺杂 亲水性
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文章速递碳纤维复合材料层间增强增韧技术研究进展 认领
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作者 卢康逸 张月义 +3 位作者 杨小平 李刚 苏清福 高尚兵 《航空制造技术》 北大核心 2020年第18期14-23,共10页
碳纤维树脂基复合材料增韧技术的升级是先进复合材料高性能化的重要途径,已经从应用于第2代复合材料的热塑性塑料共混增韧树脂基体,发展成为第3代复合材料中的层间增强增韧技术。北京化工大学先进复合材料研究中心(Advanced Composites ... 碳纤维树脂基复合材料增韧技术的升级是先进复合材料高性能化的重要途径,已经从应用于第2代复合材料的热塑性塑料共混增韧树脂基体,发展成为第3代复合材料中的层间增强增韧技术。北京化工大学先进复合材料研究中心(Advanced Composites Center,ACC)针对复合材料层间增韧技术,分别开展纳米纤维、胶膜和颗粒3种方法的基础研究,突破了方法构建和增韧机理等科学问题,并实现了颗粒层间增韧方法的工程应用。总结了ACC团队在层间增强增韧方向的研究成果,结合国内外研究进展,对比了3种层间增韧技术及其多尺度增强增韧的效果,并展望了层间增韧技术的发展及应用前景。 展开更多
关键词 纤维增强复合材料 增韧 纳米纤维 胶膜 颗粒
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文章速递Research on oil film characteristics of piston pair in swash plate axial piston pump 认领
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作者 王晓晶 Sun Yuwei Shen Zhiqi 《高技术通讯:英文版》 EI CAS 2020年第3期306-314,共9页
The research on the oil film characteristic of piston pair is beneficial to the design and optimization of friction pair,which can improve the performance of piston pump.The fluid pressure of piston cavity is accurate... The research on the oil film characteristic of piston pair is beneficial to the design and optimization of friction pair,which can improve the performance of piston pump.The fluid pressure of piston cavity is accurately obtained by AMEsim simulation.Oil film thickness field model of piston pair under the slanting state of piston is established,and the distribution law is numerically analyzed under different speed and pressure by Matlab.The experiment model pump for oil film characteristic of piston pair is designed to measure oil film thickness under the pressure of 18 MPa.The experiment results show that oil film thickness varies greatly under high pressure,and oil film thickness fluctuates sharply under low speed.The minimum oil film thickness increases with spindle speed increasing and oil film characteristic of piston pair based on the numerical analysis method is verified.This method lays a foundation for studying the friction performance of piston pair in the axial piston pump. 展开更多
关键词 axial piston pump piston pair oil film characteristics model pump numerical analysis
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文章速递不锈钢金属双极板TiW和TiTa膜的制备及性能 认领
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作者 石锟 王树博 +2 位作者 李微微 谢晓峰 陈靖 《化工进展》 EI CAS CSCD 北大核心 2020年第10期4081-4087,共7页
针对质子交换膜燃料电池金属双极板耐蚀性和导电性有待提高的问题,本文用磁控溅射双靶共溅的方法,在316L不锈钢基体表面沉积TiW和TiTa两种非贵金属膜层。通过X射线衍射、扫描电子显微镜-能谱仪、X射线光电子能谱仪、电化学和接触电阻测... 针对质子交换膜燃料电池金属双极板耐蚀性和导电性有待提高的问题,本文用磁控溅射双靶共溅的方法,在316L不锈钢基体表面沉积TiW和TiTa两种非贵金属膜层。通过X射线衍射、扫描电子显微镜-能谱仪、X射线光电子能谱仪、电化学和接触电阻测试等方法,表征了涂覆膜层后不锈钢的微观结构、表面形貌、化学组成、耐腐蚀性和导电性。实验结果表明,磁控溅射制备得到的TiTa膜表面较为均匀,且TiTa膜沉积的不锈钢具有较好的耐腐蚀性,其恒电位极化电流密度能够维持在0.3μA/cm^2;从导电性来看,TiW膜与碳纸之间的接触电阻小于TiTa膜。综合考虑材料的各项性能,认为沉积TiTa膜的316L不锈钢有用作金属双极板材料的潜力。 展开更多
关键词 燃料电池 腐蚀
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文章速递电影本体之问与形态选择 认领
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作者 王志敏 《电影艺术》 CSSCI 北大核心 2020年第5期3-9,共7页
本文对电影研究者给电影下定义与对电影发展前景进行预期两个方面做了概要的历史性梳理,其中涉及了安德烈·巴赞、克拉考尔、克里斯蒂安·麦茨、麦克卢汉、雷诺阿、福柯、德里达、罗兰·巴特、吉尔·德勒兹等电影评论... 本文对电影研究者给电影下定义与对电影发展前景进行预期两个方面做了概要的历史性梳理,其中涉及了安德烈·巴赞、克拉考尔、克里斯蒂安·麦茨、麦克卢汉、雷诺阿、福柯、德里达、罗兰·巴特、吉尔·德勒兹等电影评论家、理论家、导演乃至思想家和哲学家对这个问题的观点。试图阐明,正是这种概要的历史性梳理能够告诉我们,其实电影并没有人们想象的那么高深莫测、玄奥难解,但是电影的发展却非常可能超出人们一往情深的想象。 展开更多
关键词 电影 语言 系统 选择性 存在感
文章速递5G技术背景下电影产业发展的机遇、挑战和对策 认领
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作者 刘汉文 《电影艺术》 CSSCI 北大核心 2020年第5期155-160,共6页
5G具有"高速率、低时延、大容量"等技术特征,将满足各行各业信息通信的需求,促进高新技术格式电影、虚拟现实/增强现实(VR/AR)类影片、网络电影和互动电影的制作生产,以及电影多渠道发行放映、影院观影效果等电影产业各环节... 5G具有"高速率、低时延、大容量"等技术特征,将满足各行各业信息通信的需求,促进高新技术格式电影、虚拟现实/增强现实(VR/AR)类影片、网络电影和互动电影的制作生产,以及电影多渠道发行放映、影院观影效果等电影产业各环节的发展和整体升级。同时,电影行业要看到移动通信技术迅猛发展、研发力量相对薄弱、在线播映的增加对影院生存发展以及来自传统电影观念的挑战,以积极的心态,适应5G及5G之后的信息通信技术演进,推动文化繁荣发展。 展开更多
关键词 5G 电影 机遇 挑战 对策
文章速递Nanoflower ZnO thin-film grown by hydrothermal technique based Schottky diode 认领
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作者 Ghusoon M.Ali Ahmed K.Khalid Salah M.Swadi 《半导体学报:英文版》 EI CAS CSCD 北大核心 2020年第10期25-28,共4页
This paper reports the realization of planar Schottky diodes based on nanorod ZnO thin film.The nanorod ZnO thin film was fabricated by hydrothermal technique on boron doped p-type Si(100)substrate.The Ag//ZnO/Al plan... This paper reports the realization of planar Schottky diodes based on nanorod ZnO thin film.The nanorod ZnO thin film was fabricated by hydrothermal technique on boron doped p-type Si(100)substrate.The Ag//ZnO/Al planar diode operating with voltage bias from–3 to 3 V.The I–V characteristics clearly indicate that the devices have rectifying performance.The thermionic emission theory governs the current across the studied Schottky diode.The device achieved a turn-on voltage of 0.9 V,barrier height 0.69 e V and saturation current of 1.2×10~(–6)A.The diode shows a very large ideality factor(n>>2)which is attributed to high interface trap concentration.The surface topology was investigated by scanning electron microscope(SEM).The structural properties of the nanostructured ZnO thin film were characterized by X-ray diffraction(XRD).The SEM images reveal that the ZnO nanorods grow perpendicular to the substrate with uniformity and high density.The XRD pattern illustrates the dominant peak appearing at(002).This intense peak indicates the c-axis orientated phase of the wurtzite ZnO structure.It demonstrates that the crystals grow uniformly perpendicular to the substrate surface in good agreement with the SEM images. 展开更多
关键词 ZnO Schottky diode thin film
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文章速递Influence of Aging Time on Microstructure and Corrosion Behavior of a Cu-Bearing 17Cr–1Si–0.5Nb Ferritic Heat-Resistant Stainless Steel 认领
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作者 Tong Zhang Ying Han +3 位作者 Wen Wang Yang Gao Ying Song Xu Ran 《金属学报:英文版》 SCIE EI CAS CSCD 2020年第9期1289-1301,共13页
17 Cr–1 Si–0.5 Nb–1.2 Cu ferritic heat-resistant stainless steel was aged at 750 °C from 10 min to 30 h to simulate time aging and study the microstructural evolution and its effect on corrosion behavior by us... 17 Cr–1 Si–0.5 Nb–1.2 Cu ferritic heat-resistant stainless steel was aged at 750 °C from 10 min to 30 h to simulate time aging and study the microstructural evolution and its effect on corrosion behavior by using optical microscopy, scanning electron microscopy, transmission electron microscopy, potentiodynamic polarization, electrochemical impedance spectroscopy, and the Mott–Schottky approach. Four types of precipitates were discovered, including ε-Cu, NbC, Fe3 Nb3 C, and Fe2 Nb-type Laves phase. The nano-sized ε-Cu phase forms first, and its fraction follows the parabolic law change and is the largest. Compared to NbC and Fe3 Nb3 C particles, the coarsening of the Laves phase is the most pronounced. The aging process is divided into three parts: early-aged(0–5 h), peak-aged(5 h), and over-aged(5–30 h). However, the corrosion resistance is reduced in the early-aged stage of 0–2 h. Further extending the aging time to 30 h, the corrosion resistance is gradually improved. This change may be related to the competitive relationship between the beneficial effects of the Cu-rich phase and the harmful effects of Nb-containing particles. The dissolved Cu on the surface becomes more effective for the suppression of the anodic dissolution by the formation of ionic compounds of chlorine, thereby reducing the deterioration of corrosion resistance caused by Nb-rich precipitation. 展开更多
关键词 Ferritic stainless steel Aging Precipitation Electrochemical behavior Passive film
文章速递Structural and plasma characterization of the power effect on the chromium thin film deposited by DC magnetron sputtering 认领
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作者 S.Alsheikh Salo B.Abdallah +1 位作者 M.Akel M.Kakhia 《光电子快报:英文版》 EI 2020年第5期369-372,共4页
The chromium(Cr)films on silicon Si(100)substrate are prepared using DC magnetron sputtering technique at an argon gas pressure of 3 Torr for different applied powers(40—140 W).The chemical composition,the thicknesse... The chromium(Cr)films on silicon Si(100)substrate are prepared using DC magnetron sputtering technique at an argon gas pressure of 3 Torr for different applied powers(40—140 W).The chemical composition,the thicknesses and the structural characterization of the deposited Cr films are studied and analyzed using energy dispersive X-ray spectroscopy(EDX),scanning electron microscopy(SEM),and X-ray diffraction(XRD),respectively.Furthermore,the generated plasma parameters,including floating potential,plasma potential,electron density,ion density and electron temperature,have been measured,and the automated Langmuir probe is used for the Cr films deposition.The ion and metal fluxes are also determined.The results show that the Cr film thickness enhances with the higher applied power.The Cr deposited films properties are characterized and correlated with the measured plasma parameters. 展开更多
关键词 deposited chromium film
木质纤维素的功能化应用 认领
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作者 蔡梦洁 马丽 +3 位作者 李绪旺 李妍 王斌收 董翠华 《齐鲁工业大学学报》 2020年第3期36-41,共6页
木质纤维素是地球上最丰富的,可持续的,生物可降解,生物相容性和易于化学改性的生物质资源。随着现代物理和化学技术的进步,木质纤维素及其衍生物广泛应用于食品添加剂、药物的缓控释放、新型复合材料以及生物医药等领域。在新型智能制... 木质纤维素是地球上最丰富的,可持续的,生物可降解,生物相容性和易于化学改性的生物质资源。随着现代物理和化学技术的进步,木质纤维素及其衍生物广泛应用于食品添加剂、药物的缓控释放、新型复合材料以及生物医药等领域。在新型智能制造领域,由木制纤维素制备出的高性能、多功能纤维、新型多功能薄膜以及纤维素凝胶产品已广泛应用于各种新技术领域,如电子、生物医学设备和能源。本文重点介绍从一维到三维的纤维素基复合功能性材料的制备及应用。 展开更多
关键词 木质纤维素 纤维 薄膜 复合功能材料
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Mn doping effects on the gate-tunable transport properties of Cd3As2 films epitaxied on GaAs 认领
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作者 Hailong Wang Jialin Ma +1 位作者 Qiqi Wei Jianhua Zhao 《半导体学报:英文版》 EI CAS CSCD 2020年第7期33-38,共6页
The Mn doping effects on the gate-tunable transport properties of topological Dirac semimetal Cd3As2 films have been investigated.Mn-doped Cd3As2 films are directly grown on GaAs(111)B substrates by molecular-beam epi... The Mn doping effects on the gate-tunable transport properties of topological Dirac semimetal Cd3As2 films have been investigated.Mn-doped Cd3As2 films are directly grown on GaAs(111)B substrates by molecular-beam epitaxy,during which the single crystal phase can be obtained with Mn concentration less than 2%.Shubnikov-de Haas oscillation and quantum Hall effect are observed at low temperatures,and electrons are found to be the dominant carrier in the whole temperature range.Higher Mn content results in smaller lattice constant,lower electron mobility and larger effective band gap,while the carrier density seems to be unaffected by Mn-doping.Gating experiments show that Shubnikov-de Haas oscillation and quantum Hall effect are slightly modulated by electric field,which can be explained by the variation of electron density.Our results provide useful information for understanding the magnetic element doping effects on the transport properties of Cd3As2 films. 展开更多
关键词 molecular-beam epitaxy Dirac semimetal Cd3As2 film Mn doping quantum transport
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口模直径对高密度聚乙烯薄膜性能的影响 认领
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作者 李艳芹 王金道 +1 位作者 王佳琦 樊洁 《石化技术与应用》 CAS 2020年第4期240-243,共4页
分别采用口模直径为50,75 mm的吹膜机制得高密度聚乙烯薄膜产品DN 50,DN 75,考察了口模直径对薄膜性能的影响。结果表明:DN 50薄膜的拉伸强度、横向撕裂强度、横向断裂标称值、落标冲击质量均高于DN 75薄膜;但DN 50薄膜的雾度、纵向撕... 分别采用口模直径为50,75 mm的吹膜机制得高密度聚乙烯薄膜产品DN 50,DN 75,考察了口模直径对薄膜性能的影响。结果表明:DN 50薄膜的拉伸强度、横向撕裂强度、横向断裂标称值、落标冲击质量均高于DN 75薄膜;但DN 50薄膜的雾度、纵向撕裂强度、纵向断裂标称值均低于DN 75薄膜;相同条件下制得的薄膜,随着吹胀比的增大,其雾度、横向拉伸强度、纵向撕裂强度、纵向断裂标称值增加,落标冲击质量降低;相同吹胀比下,DN 50薄膜的结晶度与DN 75相当。 展开更多
关键词 高密度聚乙烯 吹塑 薄膜 口模 直径 力学性能 光学性能
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Can the Prior Cathodic Polarisation Treatment Remove the Air-Formed Surface Film and Is It Necessary for the Potentiodynamic Polarisation Test? 认领
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作者 Zheng-Rong Ye Zhi-Chao Qiu +3 位作者 Zheng-Bin Wang Yu-Gui Zheng Ran Yi Xiang Zhou 《金属学报:英文版》 SCIE EI CAS CSCD 2020年第6期839-845,共7页
This paper clarifies two issues related to the prior cathodic polarisation treatment(PCPT) for the potentiodynamic polarisation test: whether PCPT can(1) remove the air-formed surface film and(2) affect the polarisati... This paper clarifies two issues related to the prior cathodic polarisation treatment(PCPT) for the potentiodynamic polarisation test: whether PCPT can(1) remove the air-formed surface film and(2) affect the polarisation test results. X-ray photoelectron spectroscopy analyses of fluoride ion-labelled samples show that PCPT cannot remove the surface film completely due to the low reaction rate. Potentiodynamic polarisation tests demonstrate that PCPT with proper operating parameters,-1.0 V SCE for 5 min with subsequent open circuit potential(OCP) stabilisation in this study, is necessary because it can improve the test reproducibility without affecting the corrosion parameters by unifying the initial surface state. However, PCPT with lower potentials, longer time or no OCP stabilisation has significant effects on the electrochemical corrosion parameters due to the hydrogen absorption under the conditions of this study. 展开更多
关键词 Stainless steel Prior cathodic polarisation treatment Surface film Potentiodynamic polarisation
不同盐对壳聚糖膜性能的影响 认领
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作者 喻弘 彭春 +2 位作者 李发彩 吴知远 喻鹏 《食品工业》 CAS 北大核心 2020年第7期13-15,共3页
试验旨在研究不同盐对壳聚糖膜特性的影响,以期改善壳聚糖膜的性质。结果表明:添加乳酸钙对壳聚糖膜的透过率没有影响,而添加其他盐均会降低壳聚糖膜的透过率,其中氯化钙对壳聚糖膜的透过率影响最大;添加盐可以降低壳聚糖膜的抗拉强度,... 试验旨在研究不同盐对壳聚糖膜特性的影响,以期改善壳聚糖膜的性质。结果表明:添加乳酸钙对壳聚糖膜的透过率没有影响,而添加其他盐均会降低壳聚糖膜的透过率,其中氯化钙对壳聚糖膜的透过率影响最大;添加盐可以降低壳聚糖膜的抗拉强度,增大壳聚糖膜的最大伸长率;由扫描电镜图片可知,添加乳酸钙所制备的壳聚糖膜的表面和断面是较为光滑平整的,而添加其他盐后壳聚糖膜的表面和断面均变得粗糙。 展开更多
关键词 壳聚糖 扫描电镜 性能
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