Magnetic resonance (MR) images can be used to detect lesions in the brains of multiple sclerosis (MS) patients and is essential for diagnosing the disease and monitoring its progression. An automatic method is presented for segmentation of MS les

一个横截面尺寸为200x300 mm 的二维导热物体，边界条件分别为：左边绝热；右边与接触的流体对流换热，表面传热系数为50 W/(m2·K)，流体温度为20°C；上边维持均匀的温度400°C；下边被常热流加热，热流密度为1500 W/m2。已知该物体的热导率为45 W/(m·K)。采用均匀网格，△y=△x=50mm，试用数值方法计算该物体的温度分布。(A two-dimensional heat conducting object with a cross-section size of 20