利用OpenGL将读取到的柴油机缸内信息转换成容易接受的图像形式,绘制了柴油机燃烧室的网格图和温度场的伪彩图,实现了柴油机燃烧过程中缸内温度场计算结果的可视化。并将OpenGL与Techp lot 2种软件的绘图结果进行了比较,结果表明:OpenG...利用OpenGL将读取到的柴油机缸内信息转换成容易接受的图像形式,绘制了柴油机燃烧室的网格图和温度场的伪彩图,实现了柴油机燃烧过程中缸内温度场计算结果的可视化。并将OpenGL与Techp lot 2种软件的绘图结果进行了比较,结果表明:OpenGL所绘制的网格图和伪彩图基本正确地反映了燃烧室内的温度分布。展开更多
采用低场核磁共振(nuclear magnetic resonance,NMR)及成像技术对花生浸种过程中水分动态变化及水分传递进行了研究,考察花生浸种过程中横向驰豫时间(transverse relaxation time,T2)和MRI图像的变化。结果显示,浸种期间,结合水弛豫时...采用低场核磁共振(nuclear magnetic resonance,NMR)及成像技术对花生浸种过程中水分动态变化及水分传递进行了研究,考察花生浸种过程中横向驰豫时间(transverse relaxation time,T2)和MRI图像的变化。结果显示,浸种期间,结合水弛豫时间和幅值变化不大,说明花生种子在浸种过程中,种子内有机物与水分结合的数量从整体上相对稳定;自由水对应横向弛豫谱信号幅值不断增加,弛豫时间向右移动,表明花生在浸种过程中种子内部自由水数量不断增加,且其流动性增加。MRI图像显示,浸种过程中水最先从胚端部位进入种子,远胚端同样有水分浸入,但数量少于胚端,沿表皮进入种子内部的水扩散速度比较慢。本文建立了一种适合研究花生种子萌发期间水分动态变化的科学方法,丰富了花生种子吸胀期间对水分动态变化和代谢参与的研究,并为改善花生精准浸种和优化工艺提供有益参考。展开更多
The visual features of continuous pseudocolor encoding is discussed and the optimiz- ing design algorithm of continuous pseudocolor scale is derived.The algorithm is restricting the varying range and direction of ligh...The visual features of continuous pseudocolor encoding is discussed and the optimiz- ing design algorithm of continuous pseudocolor scale is derived.The algorithm is restricting the varying range and direction of lightness,hue and saturation according to correlation and naturalness,automatically calculating the chromaticity coordinates of nodes in uniform color space to get the longest length of scale path,then interpolating points between nodes in equal color differences to obtain continuous pseudocolor scale with visual uniformity.When it was applied to the pseudocolor encoding of thermal image displays,the results showed that the correlation and the naturalness of original images and cognitive characteristics of target pattern were reserved well;the dynamic range of visual perception and the amount of visual information increased obviously;the contrast sensitivity of target identification improved;and the blindness of scale design were avoided.展开更多
文摘目的探讨早期膝骨关节炎(OA)患者软骨下骨骨髓病变与相应区域关节软骨损伤的关系。方法对纳入研究的67名早期膝骨关节炎患者(OA组)及22名健康志愿者(健康组)的膝关节进行磁共振扫描,在磁共振T2值测量及伪彩图(T2 mapping)序列中测量不同分区膝关节软骨T2值;OA组应用全膝关节成像评分(whole organ magnetic resonance imaging score,WORMS)评价不同分区软骨下骨骨髓病变(bone marrow lesion,BMLs)。研究比较膝关节各分区软骨T2值之间的差异,并进行不同分区患者软骨T2值与相应区域的BMLs评分的相关性分析。结果 (1)OA组中41.77%的患者K-L分级在Ⅰ级以内,58.20%为K-LⅡ级。两组体质量和BMI值差异无统计学意义(P>0.05)。(2)OA组髌骨软骨T2值、股骨软骨T2值均明显高于健康组(P<0.05)。(3)早期膝骨关节炎患者都伴随有不同程度的软骨损伤和骨赘形成;软骨下骨骨髓病变及半月板损伤的发生率也很高,分别占86.4%和84.8%;提示早期膝骨关节炎的病理改变是包含软骨、软骨下骨、半月板等在内的全膝关节退变。(4)早期膝骨关节炎患者内外侧股骨髁,内外侧胫骨平台BMLs的WORMS评分均与相应区域软骨T2值呈正相关(P<0.05)。结论早期膝骨关节炎患者的股骨、髌骨软骨都有不同程度的退变;胫骨平台、股骨髁区域BMLs范围越大,相应区域的软骨损伤越严重。
文摘利用OpenGL将读取到的柴油机缸内信息转换成容易接受的图像形式,绘制了柴油机燃烧室的网格图和温度场的伪彩图,实现了柴油机燃烧过程中缸内温度场计算结果的可视化。并将OpenGL与Techp lot 2种软件的绘图结果进行了比较,结果表明:OpenGL所绘制的网格图和伪彩图基本正确地反映了燃烧室内的温度分布。
文摘采用低场核磁共振(nuclear magnetic resonance,NMR)及成像技术对花生浸种过程中水分动态变化及水分传递进行了研究,考察花生浸种过程中横向驰豫时间(transverse relaxation time,T2)和MRI图像的变化。结果显示,浸种期间,结合水弛豫时间和幅值变化不大,说明花生种子在浸种过程中,种子内有机物与水分结合的数量从整体上相对稳定;自由水对应横向弛豫谱信号幅值不断增加,弛豫时间向右移动,表明花生在浸种过程中种子内部自由水数量不断增加,且其流动性增加。MRI图像显示,浸种过程中水最先从胚端部位进入种子,远胚端同样有水分浸入,但数量少于胚端,沿表皮进入种子内部的水扩散速度比较慢。本文建立了一种适合研究花生种子萌发期间水分动态变化的科学方法,丰富了花生种子吸胀期间对水分动态变化和代谢参与的研究,并为改善花生精准浸种和优化工艺提供有益参考。
文摘The visual features of continuous pseudocolor encoding is discussed and the optimiz- ing design algorithm of continuous pseudocolor scale is derived.The algorithm is restricting the varying range and direction of lightness,hue and saturation according to correlation and naturalness,automatically calculating the chromaticity coordinates of nodes in uniform color space to get the longest length of scale path,then interpolating points between nodes in equal color differences to obtain continuous pseudocolor scale with visual uniformity.When it was applied to the pseudocolor encoding of thermal image displays,the results showed that the correlation and the naturalness of original images and cognitive characteristics of target pattern were reserved well;the dynamic range of visual perception and the amount of visual information increased obviously;the contrast sensitivity of target identification improved;and the blindness of scale design were avoided.
