Multiphysics Structured Eddy Current and Thermography Defects Diagnostics System in Moving Mode

Eddy current testing (ET) and eddy current thermography (ECT) are both important non-destructive testing (NDT) methods that have been widely used in the field of conductive materials evaluation. Conventional ECT systems have often employed to test static specimens eventhough they are inefficient when the specimen is large. In addition, the requirement of high-power excitation sources tends to result in bulky detection systems. To mitigate these problems, a moving detection mode of multiphysics structured ET and ECT is proposed in which a novel L-shape ferrite magnetic yoke circumambulated with array coils is designed. The theoretical derivation model of the proposed method is developed which is shown to improve the detection efficiency without compromising the excitation current by ECT. The specimens can be speedily evaluated by scanning at a speed of 50-250 mm/s while reducing the power of the excitation current due to the supplement of ET. The unique design of the excitation-receiving structure has also enhanced the detectability of omnidirectional cracks. Moreover, it does not block the normal direction visual capture of the specimens. Both numerical simulations and experimental studies on different defects have been carried out and the obtained results have shown the reliability and detection efficiency of the proposed system

Primary Supratentorial Atypical Teratoid/Rhabdoid Tumor in Children

Atypical teratoid/rhabdoid tumor is a highly malignant tumor of the central nervous system, usually occurring in the posterior fossa in infants and young children. Supratentorial example is relatively rare, especially with involvement of the cerebral ventricle system. Herein, we reported 2 cases of atypical teratoid/rhabdoid tumor located in the septum pellucidum within the lateral and third ventricles and right parietooccipital region, respectively. Histopathologically, both of the tumors were composed of rhabdoid tumor cells and mesenchymal components, without primitive neuroectodermal tumor or epithelial differentiation. Immunohistochemical staining showed that these tumor cells reacted positively for vimentin, S-100 protein, synaptophysin, and neuron-specific enolase. Only 1 case was found to be epithelial membrane antigen reactive. The tumor cells lacked nuclear expression of INI1. These cases emphasize that atypical teratoid/rhabdoid tumor should be also considered in the list of differential diagnosis, even when these rhabdoid tumor cells do not arise in the predilection sites. </jats:p

Effect of Water Supply Temperature on the Performance of Low Temperature Air Source Heat Pump System

In this paper, the effect of the water supply temperature on the thermal performance of a heat pump is analyzed. The influence of the water supply temperature on the performance of a heat pump system is investigated for an ambient temperature ?12 °C and ?6 °C and an initial water supply temperature of 20 ℃. The experimental results indicate that, under the same initial temperature, the heating capacity of the compressor system first increased and then decreased, with a maximum heating capacity reached for a water supply temperature of 40 ℃. When the ambient temperature was at ?12 ℃, the water was heated by the heat pump from 25 ℃ to 55 ℃. The power consumption of the system increased from 11,905 W to 24,417 W, an increase of 105%, and the system energy efficiency decreased from 4.03 to 2.11, a decrease of 47.6%