图像技术用于交通事故再现的研究进展

总结目前国内外摄影技术在交通事故现场图的测量、车辆变形测量和事故分析过程中的应用情况，并在此基础上提出今后我国在这几方面的研究中应注意的问题。     

Experimental research on spray and combustion characteristics of the third generation conical spray

A new generation conical spray system for conventional diesel engines or premixed combustion diesel engines is introduced. By means of oriented impingement method, flexible spray penetration in design is realized. High-speed photograph was used to investigate the spatial distribution characteristics of the new spray for cases of different impingement angles and needle valve opening pressures. The results show that, by applying spray impingement orientation, fuel jets spread along the cone surface as shape of sectors, so the dispersion of jets is increased obviously. Changing on impingement angle leads to variation of penetration, which is critical in homogeneous mixture preparation. Due to the flexibility of spray penetration in design, the spray impingement on liner is avoided in a great extent. The results also indicate that higher needle valve opening pressure results in longer penetration and larger spray angle after impingement. Combustion characteristics of the impinged conical spray were studied in the 1135 type diesel engine. The new impinged conical spray system work smoothly in full load range with better fuel economy and lower emissions of NOx and soot than the original test engine.     

剪切波弹性成像与乳腺X线摄影对乳腺肿块诊断价值的比较

目的比较剪切波弹性成像(SWE)与乳腺X线摄影对乳腺良、恶性肿块的鉴别诊断价值。方法对96个乳腺病灶术前行SWE和乳腺X线摄影检查。SWE采用最大弹性模量值(E-max)进行评估。以病理结果为金标准,比较两种技术诊断乳腺病变的效能。结果 E-max诊断乳腺恶性病变的敏感性、特异性、准确性、阳性和阴性预测值分别为91.3%、94.0%、92.7%、93.3%、92.1%;Emax的敏感性和准确性均高于乳腺X线摄影(P均<0.05)。Emax诊断乳腺良、恶性病灶的受试者特征曲线下面积为0.983(95%CI,0.963~0.998)。结论 SWE在诊断乳腺良、恶性病灶时较乳腺X线摄影更有价值。     

一种新型汽车行驶跑偏测试系统

汽车行驶跑偏会带来严重的后果，因此需要开发汽车行驶跑偏的测试系统。基于近景摄影技术并结合图像处理的汽车行驶跑偏测试系统是一种新型的汽车测试系统。文章介绍了系统的组成、测试原理及技术关键，并进行了误差分析。指出该测试系统采用非接触性量测手段，精度高；数字化信息，实时自动运行计算，速度快，可靠性高；对于有生产效率要求的整车生产厂，此测试系统具有广泛的使用意义。     

新型定向加密软件—ORIMA

介绍空中三角测量加密软件ORIMA及其操作过程，并对其优越性进行概述。     

Helava摄影测量系统空三加密作业技巧及精度探讨

介绍Helava摄影测量系统空三加密作业技巧，并采用与AC1解析摄影测量系统空三加密成果的对比实验方式，对其进行精度探讨。     

关于举办第二届“中国海事”摄影大赛的通知

在广大摄影工作者和摄影爱好者的大力支持下,《中国海事》杂志社举办的第一届摄影大赛取得了圆满成功。为将这项活动进一步深入开展下去,现决定举办第二届《中国海事》摄影大赛。     

在科研中如何发挥科技摄影的作用

论述了科技摄影的含义、基本要求、在科研中如何发挥作用、与照片档案的关系。