Lamb wave tomography can be used to evaluate structural integrity. The time-of-flight (TOF) data are usually recorded as input to the reconstruction algorithm. For composite materials, TOF estimation is complicated due to their anisotropy. To reduce the effects of anisotropy on image reconstruction, the TOF data of flawed plates are revised according to baseline data obtained from an unflawed plate. Tomographic images are reconstructed using the original and revised TOF data, respectively. Results show that images reconstructed using the revised TOF data have better visual quality and that TOF data revision can substantially reduce the artifacts resulting from anisotropy in defect detection of composite materials.

Background: Primary localized mediastinal mesothelioma is a rare tumour which accounts for about 0.7% of all mesotheliomas. The mesothelial cells lining of the pericardium are suggested as the most probable cells of origin. Mediastinal pleural mesothelioma are distinctly uncommon, which has only been reported in a single case. Case presentation: We report a case of a 57 years old man with primary mediastinal pleural mesothelioma involving middle and posterior upper mediastinum, one months following surgery, the patient is alive with good performance status. Chest plain scan and contrast-enhanced computer tomography（CT）scan showed a 43 mm×36 mm×36 mm tumor，with a CT value of about 41.5 HU, an arterial phase CT value of about 59.8HU and a venous phase CT value of about 77.5HU during the contrast-contrast-enhanced scan.Patients underwent thoracotomy.The pathological diagnosis was derived from malignant pleural mesothelioma(MPM) growing from the chest wall into the mediastinum. Conclusions Imaging manifestations of tumors have rarely been described in the literature. A short review of literature on MPM is given and summarize the imaging characteristics.

Based on the microscopic characteristics of fiber reinforced composite ceramics, the slippage stress at the interface of composite ceramics under external loading is analyzed. The relation between the applied strain of the triangular symmetrical eutectic and the load of composite ceramics is confirmed. And the maximum shear stress that the triangular symmetrical eutectic can endure is computed. The yield shear stress was calculated by the hardness and fracture toughness of composite ceramics. When the maximum shear stress which the triangular symmetrical eutectic can bear is equal to the yield shear stress, the slipping stress of micro-mechanical interface in composite ceramics is obtained. The results showed that fiber inclusions in the eutectic having smaller dimension and larger volume content would provide larger partial plastic deformation of composite ceramics.

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