Previous analytical results on flow splitting are generalized to consider multiple boiling channels systems. The analysis is consistent with the approximations usually adopted in the use of systems codes (like RELAP5 ...Previous analytical results on flow splitting are generalized to consider multiple boiling channels systems. The analysis is consistent with the approximations usually adopted in the use of systems codes (like RELAP5 and TRACE5, among others) commonly applied to perform safety analyses of nuclear power plants. The problem is related to multiple, identical, parallel boiling channels, connected through common plena. A theoretical model limited in scope explains this flow splitting without reversal. The unified analysis performed and the confirmatory computational results found are summarized in this paper. New maps showing the zones where this behavior is predicted are also shown considering again twin pipes. Multiple pipe systems have been found not easily amenable for analytical analysis when dealing with more than four parallel pipes. However, the particular splitting found (flow along N pipes dividing in one standalone pipe flow plus N -1 identical pipe flows) has been verified up to fourteen pipes, involving calculations in systems with even and odd number of pipes using the RELAP5 systems thermal-hydraulics code.展开更多
OCR(Optical Character Recognition)是通过检测字符每个像素亮度的模式确定其形状,然后用字符识别方法将形状翻译成计算机文字的过程。文章利用Java语言实现OCR步骤,包括像素二值化,图像分割,训练识别和输出等。测试开发是在web验证码...OCR(Optical Character Recognition)是通过检测字符每个像素亮度的模式确定其形状,然后用字符识别方法将形状翻译成计算机文字的过程。文章利用Java语言实现OCR步骤,包括像素二值化,图像分割,训练识别和输出等。测试开发是在web验证码识别场景中进行的,web验证码是将一串随机产生的符号,生成为图片,再加上一些干扰线,使之能有效防止恶意注册和灌水。通过测试表明,该方法可行、有效;拒识率、误识率低;识别速度快,具有一定的实用意义。展开更多
文摘Previous analytical results on flow splitting are generalized to consider multiple boiling channels systems. The analysis is consistent with the approximations usually adopted in the use of systems codes (like RELAP5 and TRACE5, among others) commonly applied to perform safety analyses of nuclear power plants. The problem is related to multiple, identical, parallel boiling channels, connected through common plena. A theoretical model limited in scope explains this flow splitting without reversal. The unified analysis performed and the confirmatory computational results found are summarized in this paper. New maps showing the zones where this behavior is predicted are also shown considering again twin pipes. Multiple pipe systems have been found not easily amenable for analytical analysis when dealing with more than four parallel pipes. However, the particular splitting found (flow along N pipes dividing in one standalone pipe flow plus N -1 identical pipe flows) has been verified up to fourteen pipes, involving calculations in systems with even and odd number of pipes using the RELAP5 systems thermal-hydraulics code.
文摘OCR(Optical Character Recognition)是通过检测字符每个像素亮度的模式确定其形状,然后用字符识别方法将形状翻译成计算机文字的过程。文章利用Java语言实现OCR步骤,包括像素二值化,图像分割,训练识别和输出等。测试开发是在web验证码识别场景中进行的,web验证码是将一串随机产生的符号,生成为图片,再加上一些干扰线,使之能有效防止恶意注册和灌水。通过测试表明,该方法可行、有效;拒识率、误识率低;识别速度快,具有一定的实用意义。
