基于三圆轨迹规划的MARKⅢ型LNG薄膜舱波纹板机器人焊接

MARKⅢ型LNG薄膜舱波纹板的焊接质量是LNG船建造成功与否的关键之一。为了实现MARKⅢ型LNG薄膜舱1.2mm厚304L不锈钢波纹板的机器人焊接,研究了基于“三圆”连接构思的波纹板机器人焊接的轨迹规划模型,通过模型计算了沿波纹板轨迹焊接过程中的焊枪位置和焊枪姿态坐标,并对模型和计算的结果进行了仿真验证;在此基础上,进行了不锈钢波纹板机器人搭接焊的脉冲等离子弧焊的工艺优化研究。结果表明:本文建立的波纹板机器人焊接的“三圆”轨迹规划模型以及基于该模型计算的焊枪位姿坐标准确;基于模型和计算,结合优化后的脉冲等离子弧焊工艺参数,实现了焊缝成形良好的MARKⅢ型LNG薄膜舱1.2mm厚304L不锈钢波纹板搭接的机器人焊接,焊缝成形达到了法国GTT公司标准文件中提供的成形尺寸标准。

沉默MARK4通过NF-κB信号通路抑制溃疡性结肠炎细胞焦亡和炎症因子表达

目的探讨MARK4(microtubule-affinity regulating kinase 4,MARK4)在脂多糖(lipopolysaccharide,LPS)诱导的FHC细胞溃疡性结肠炎(ulcerative colitis,UC)模型中对FHC细胞焦亡、炎症因子释放和肠道屏障相关蛋白表达的影响及其可能分子机制。方法采用Western blot检测UC患者、健康人群结肠组织和LPS诱导的FHC细胞炎症模型中MARK4和细胞焦亡相关的因子Caspase-1、NLRP3和GSDMD的表达水平;通过质粒转染shRNA沉默FHC细胞中MARK4,在正常对照组、LPS组和沉默MARK4+LPS组中采用Western blot分别检测Caspase-1、NLRP3、GSDMD、肠道屏障相关蛋白和NF-κB信号通路相关蛋白的表达水平;ELISA和RT-qPCR检测炎症因子IL-1β、IL-6和TNF-α表达水平;流式细胞术检测细胞凋亡情况。结果在UC患者结肠组织和LPS诱导FHC细胞体外UC炎症模型中MARK4和焦亡相关蛋白包括NLRP3、Caspase-1和GSDMD的表达水平显著升高。沉默MARK4能够抑制LPS诱导FHC细胞中焦亡相关蛋白NLRP3、Caspase-1、GSDMD表达水平,下调炎症相关细胞因子IL-1β、IL-6和TNF-α的表达水平,抑制FHC细胞凋亡,上调肠道屏障相关蛋白ZO-1、Occludin表达和上调Claudin2的表达水平。GSEA富集分析显示,MARK4与NF-κB信号通路呈正相关。沉默MARK4能够抑制NF-κB信号通路中p-P65、p-IKKα的表达水平。结论MARK4在UC组织和细胞中显著高表达,沉默MARK4能够通过阻滞NF-κB信号通路激活,进而抑制UC细胞焦亡和炎症因子表达。MARK4可能成为UC患者治疗的一个潜在靶点。

运动对孤独症谱系障碍大鼠内侧前额叶皮层树突棘重塑的影响及MARK1/MAP1A/PSD-95通路的作用

目的:探讨游泳结合转轮跑步运动干预对丙戊酸(valproic acid,VPA)诱导的孤独症谱系障碍(autism spectrum disorder,ASD)大鼠内侧前额叶皮层树突棘结构重塑的影响,以及微管亲和力调节激酶1(microtubule affinity regulating kinase 1,MARK1)、微管相关蛋白1A(microtubule-associated protein 1A,MAP1A)和突触后致密蛋白95(postsynaptic density protein-95,PSD-95)的作用。方法:通过妊娠期VPA或生理盐水暴露的方法收集雄性子代制备ASD模型大鼠及对照大鼠,随机分为运动组和静置组,每组9~11只。采用三箱社交实验评价运动对ASD大鼠社交行为的影响,荧光示踪病毒局部感染观察内侧前额叶皮层亚区边缘前皮层(prelimbic cortex,PrL)和边缘下皮层(infralimbic cortex,IL)树突棘密度和形态,Western blot检测PSD-95和突触小泡蛋白(synaptophysin,Syn)蛋白表达,RNA原位杂交检测MARK1、MAP1A和PSD-95阳性颗粒数及共定位情况。结果:与对照组相比,ASD模型组大鼠社交行为存在缺陷,表现为在陌生大鼠箱体的活动时间、嗅探陌生大鼠的时间和频率均显著减少(P<0.05);经过运动干预后ASD大鼠的社交行为显著改善。树突棘形态观察发现ASD大鼠PrL区而不是IL区总树突棘密度显著增加,主要表现为蘑菇型和短粗型树突棘密度增加(P<0.05);运动干预能有效改善树突棘异常重塑。Western blot发现运动干预能有效逆转ASD大鼠PrL区的PSD-95蛋白表达上升的趋势;而PrL区的Syn及IL区的PSD-95和Syn蛋白表达在各组均无统计学差异。RNA原位杂交发现运动干预能有效降低ASD大鼠PrL区异常增多的MARK1、MAP1A和PSD-95的RNA阳性颗粒数,降低MARK1+MAP1A、MARK1+PSD-95和MAP1A+PSD-95的共定位。结论:运动干预可能通过PrL区MARK1/MAP1A/PSD-95分子通路改善ASD大鼠树突棘结构重塑,从而改善社交相关行为障碍。

Methods to prevent side marks from rusting on heavy steel plates

When a steel plate produced by a steel plant leaves the factory,its upper surface should be marked with the specification,variety,batch number,and other identifying information,and its side should be marked with a side marking.The side marking contains the plate number,specification,batch number,and other information,which are convenient for customers to accurately identify relevant information after stacking.However,because of the influence of weather,environment,and other factors,the side marking becomes unidentifiable when the steel plate is corroded,affecting the customer’s loading,unloading,and other operations.The development and application of side anticorrosion devices and cleaning of finished heavy steel plates with antirust agents will solve the problem of unrecognizable side marking due to corrosion.

基于机器视觉的工件Mark点快速提取方法研究

在现代化工业生产流程中,工件Mark点类型繁多且提取过程既复杂又低效。为解决这一问题,提出了一种基于机器视觉的工件Mark点快速提取的方法。首先,使用工业相机采集原始图像,然后对图像进行预处理以减少噪声和锯齿的影响。随后,针对目标边缘提取繁琐且不准确的问题,提出一种基于OpenCV的卡尺工具算法,该算法通过在检测边缘周围产生等大等距的测量矩形,利用亚像素图像及改进的Canny边缘检测算子获得测量矩形内的最佳边缘点,再利用基于梯度下降法的最小二乘法来进行直线或圆的拟合,通过该算法可以快速高效地获得工件的直线或圆边缘。最后,通过组合这些直线或圆边缘来获得所需的Mark点。实验证明,该方法可以快速而准确地拟合工件的直线边缘或圆边缘,并最终成功获取到相应的Mark点,定位精度可达到亚像素级,且具有较高的稳定性。

Mark VIe控制系统在燃驱压缩机组控制系统升级改造中的应用

针对当前集成了不同厂家几套子系统的一些燃驱压缩机组控制系统结构复杂、维护成本高等问题,应用基于Mark VIe控制平台来升级改造该系统。以某改造项目为例,应用双冗余Mark VIe控制系统架构,Mark VIe SIL3模件作为紧急停机和火气保护系统的硬件,同时采用Mark VIe ControlST统一软件平台。结果表明:新控制系统采用了一体化硬件、软件设计,提高了机组控制系统的安全可靠性,有利于日常运行维护,而且新系统具有在线监测功能,有助于系统故障排查。

立足创新发展,加速发力亚太市场——昂高集团首席执行官MarkGarrett先生和纺织染化事业部北亚区副总裁蔡晓松女士访谈

作为全球性多元化的化学品供应商,Archroma(昂高)为品牌和高性能纺织品、包装和纸张、涂料、黏合剂和密封剂市场提供领先的创新性解决方案。4月17日,在第23届中国国际染料工业及有机颜料、纺织化学品展览会现场,昂高集团首席执行官Mark Garrett先生和纺织染化事业部北亚区副总裁蔡晓松女士接受了本刊采访,介绍了昂高的发展情况以及未来的战略布局。

基于Zernike矩的PCB上氧化圆形Mark点定位算法研究

文章针对在PCB的整个生产过程中,Mark点因环境和人为等因素被氧化,导致Mark点的定位精度降低的问题,采用灰度变换法对PCB的灰度图进行处理,选用迭代选择阈值法进行图像分割,然后运用圆的特性对Mark点边缘进行筛选,用Zernike矩对其进行亚像素边缘提取,最后用最小二乘法拟合出圆并求出圆心。实验表明:该定位算法的平均误差小于0.05像素,标准误差小于等于0.025像素。

佳能EOS C500 Mark II增加多个Cinema RAW Light记录格式

佳能Cinema EOS电影摄影机EOS C500 Mark II日前发布了新固件版本1.1.1.1。经过此次固件升级,EOS C500 Mark II可支持三种新增的Cinema RAW Light记录格式:具有高画质的RAW HQ模式、标准画质的RAW ST模式和精简记录可以延长记录时间的RAW LT模式。

LNG加注船MARKⅢ型货舱KCC油漆特涂重难点分析及施工改进

LNG船的N96型货舱采用的是通过螺柱焊接货舱表面的方式固定绝缘模块,所以货舱表面的油漆仅起到临时性防腐蚀的作用;而MARKⅢ型货舱的绝缘模块是靠树脂黏结到货舱表面,对油漆与钢板表面的结合力要求极高,并且油漆表面不能有油、灰尘、漆雾等任何杂质,即又要保证油漆与钢板之间有极好的附着力,同时又要保证油漆表面绝对的干净无杂质。故MARKⅢ型货舱采用了配套的韩国进口KCC涂料,但该涂料的施工难度大,不仅是对表面处理,油漆施工的要求高,对油漆的保护也尤为重要,稍有差池,拉力试验结果就会低于需求数值。

佳能发布全画幅专微相机EOS R5 Mark Ⅱ,支持8KRAW视频拍摄

日前,佳能正式发布了EOSR系统新一代全画幅专微相机EOSR5 Mark Ⅱ。EOSR5 MarkⅡ不仅延续了EOSR5的强悍性能,还在画质、视频、对焦、连拍方面进行了全方位的升级,是一台既适合照片拍摄,又适合视频拍摄的高性能机型。

自然与工业的共鸣 上海Quotation Marks线下门店

Quotation Marks首家线下门店希望以体验生活的方式,将最初的内在精神感受作具象传达,通过自然与工业、材料与形态的结合,表现为现代社会中人能触摸、感受的空间环境或是贴身衣物。秉持对天然材料和原始细节的深度挖掘提炼,好典设计携手品牌,展开材料与形态的深度对话,呈现一个混合日本工业风格和现代粗野主义的店铺。

A study on the feasibility of CET oral test based on automatic essay marking

This paper discusses the approach to the CET （college English test） oral test based on automatic essay marking （AEM）. The reliability and validity arouses a dispute on Internet-based CET （iB-CET） oral test in China, leading to the penetration into oral test contents in dialogue, description or comment, and question answering. Then, a probe into transformation from a spoken document into a textual document is touched on a conversion ratio of 72% adopted at the present time, AEM to be carried forward being a necessary hypothesis for Afterwards, this paper focuses on the pipeline in AEM with the content features and the language itself, which is established in two different models in marking for extraction and detection. Through experiments, this paper reveals the fact that an iB-CET oral test can be performed perfectly in the pipeline of spoken documents transformed into textual documents which can be automatically marked. Hence the design of the iB-CET oral test reaches its reliability and validity.

应用Beach marking方法检测钢结构疲劳裂纹扩展

掌握裂纹扩展规律是钢结构疲劳性能研究的一个基本问题。本文介绍了一种检测钢结构疲劳裂纹扩展的新型方法,即Beach marking方法。论文首先简述了这种方法测试疲劳裂纹扩展的基本原理,然后通过一个试验案例,展示了这种方法的具体应用和要点试验表明这种方法简单实用,通过运用合适的疲劳荷载序列,可在疲劳断口留下疲劳弧线,从而间接有效地记录了疲劳裂纹的扩展全过程。

The Marking Technology in Motion Capture for the Complex Locomotor Behavior of Flexible Small Animals(Gekko gecko)

Animals have evolved a variety of behavior patterns to adapt to the environment. Motion-capture technology is utilized to quantify and characterize locomotor behaviors to reveal the mechanisms of animal motion. In the capture of flexible, small animals with complex locomotor behaviors, the markers interfere with each other easily, and the motion forms(bending, twisting) of the moving parts are obviously different;thus, it is a great challenge to realize accurate quantitative characterization of complex locomotor behaviors. The correlation between the marker properties, including the size and space length, and the precision of the system are revealed in this paper, and the effects of diverse marker shapes on the capturing accuracy of the captured objects in different motion forms were tested. Results showed that the precision of system is significantly improved when the ratio of the space length to the diameter of the markers is larger than four;for the capture of the spatial twisting motion of the flexible object, the hexagon markers had the lowest spatial lost-marker rate relative to the circle, triangle, and square. Customized markers were used to capture the locomotor behavior of the gecko-inspired robot(rigid connection) and the gecko(flexible connection). The results showed that this marking technology can achieve high accuracy of motion capture for geckos(the average deviation was approximately 0.32 mm, and the average deviation’s variation rate was approximately 0.96%). In this paper, the marking technology for the motion capture of flexible, small animals with complex motion is proposed;it can effectively improve the system precision as well as the capture accuracy, and realize the quantitative characterization of the complex motion of flexible, small objects. It provides a reliable technical means to deeply study the evolution of the motion function of small animals and advance systematic research of motion-capture technology.

A Novel Packet Marking Algorithm in Context-aware Autonomic QoS Framework

Autonomic networking is one of the hot research topics in the research area of future network architectures.In this paper, we introduce context-aware and autonomic attributes into DiffServ QoS framework, and propose a novel autonomic packet marking(APM) algorithm.In the proposed autonomic QoS framework, APM is capable of collecting various QoS related contexts, and adaptively adjusting its behavior to provide better QoS guarantee according to users' requirements and network conditions.Simulation results show that APM provides better performance than traditional packet marker, and significantly improves user's quality of experience.

Simple Fabrication of Hierarchical Micro/Nanostructure Superhydrophobic Surface with Stable and Superior Anticorrosion Silicon Steel via Laser Marking Treatment

To improve the weak corrosion resistance of silicon steel to acid solution and alkaline solution with high temperature,a stable hierarchical micro/nanostructure superhydrophobic surface with myriad irregular micro-scale hump and sheet-like nanostructure was successfully prepared on silicon steel by a simple,efficient and facile operation in large-area laser marking treatment.The morphology,composition,wettability of the as-prepared surface were studied.The superhydrophobic performance of the surface was investigated as well.Additionally,the corrosion resistance of the superhydrophobic surface to acidic solutions at room temperature and alkaline solutions at high temperature (80 ℃) was carefully explored.The corrosion resistance mechanism was clarified.Moreover,considering the practical application of the surface in the future,the hardness of the hierarchical micro/nanostructure superhydrophobic surface was studied.The experimental results indicate that the hierarchical micro/nanostructure surface with texture spacing of 100 μm treated at laser scanning speed of 100 mms/ presents superior superhydrophobicity after decreasing surface energy.The contact angle can be as high as 156.6°.Additionally,the superhydrophobic surface provide superior and stable anticorrosive protection for silicon steel in various corrosive environments.More importantly,the prepared structure of the surface shows high hardness,which ensures that the surface of the superhydrophobic surface cannot be destroyed easily.The surface is able to maintain great superhydrophobic performance when it suffers from slight impacting and abrasion.

Evidence of return of chum salmon released from Tangwang River by strontium marking method

In order to assess the effect of enhancement release of chum salmon(Oncorhynchus keta),otolith strontium(Sr)marking method was used to tag chum salmon released in Tangwang River in 2016.The homing chum salmon were detected and the samples were collected in Tangwang River,Ussuri River and Suifen River in the autumn of2018.The samples were analyzed by examining Sr and calcium(Ca)fingerprints in the otolith using electron probe microanalysis.The results suggested that two samples collected in Tangwang River had the marking ring near the core of otolith where the Sr concentration and Sr/Ca ratio were significantly higher than comparative samples.Proving that the two fish belonged to the released population in Tangwang River in 2016.This article indicated the success of the enhancement release of chum salmon from the Tangwang River for the first time and also confirmed the validity of Sr marking in enhancement release of fishes.

基于OpenCV的手机屏Mark定位

为实现手机屏磨边前的Mark定位,以三轴磨边机为平台,设计了一种基于OpenCV的手机屏定位系统。提出一种基于主动视觉的三轴磨边机相机标定方法,控制相机在工作台平面作两组运动,根据两组台面坐标和像素坐标实现标定。通过矫正、滤波等方法,处理相机采集到的图像,采用模板匹配算法完成手机屏Mark标的坐标提取,进而控制磨边机移动和定位。测试表明,通过该标定方法得到的单位像素对应的实际距离误差小于0.01 mm;磨头与相机距离误差小于0.1 mm;该系统能够识别并控制磨边机实现Mark定位,误差小于0.1 mm,满足了磨边机的应用需求。

MARK Ⅲ型液货围护系统波纹板焊接研究现状

从液化天然气(Liquefied Natural Gas,LNG)船MARKⅢ型液货围护系统的主屏壁波纹板焊接质量的重要性出发,分析1.2 mm厚SUS 304L不锈钢波纹板焊接的薄板特性、形状的复杂性、焊接的特殊要求和难点。在此基础上,从波纹板焊接方法和自动化焊接装备出发,论述波纹板焊接的研究现状。研究表明:目前采用的波纹板焊接方法以钨极氩弧焊和等离子弧焊为主,自动化的焊接设备主要集中应用在波纹板复杂三维结构焊接接头的焊缝跟踪、焊接轨迹自动规划、枪体姿态和工艺参数的分区自动调节等领域中;未来针对波纹板焊接的自动化技术,需进一步开展焊接现场的实时监控和焊接质量的自适应控制,以保证整个波纹板的焊接质量符合要求。