Reactive lesions of bone and soft tissue can appear alarming on histologic examination because they are often cellular and have atypical cytologic features,such as distinct nucleoli,mild hyperchromasia,and mitotic act...Reactive lesions of bone and soft tissue can appear alarming on histologic examination because they are often cellular and have atypical cytologic features,such as distinct nucleoli,mild hyperchromasia,and mitotic activity.Reactive lesions of bone and periosteum also produce bone and cartilage matrix,resulting in confusion with osteosarcoma or chondrosarcoma.Careful attention to key cytomorphological features such as the pattern of bone formation,uniform appearance of cells,and absence of atypical mitoses should help identify the reactive nature of a lesion.Correlation with clinical and radiological findings is also imperative to avoid misclassification of the tumor because reactive lesions often arise at sites where osteosarcoma and chondrosarcoma are rare(eg,the hand)and lack aggressive radiological features.Here we present a case of exuberant callus formation after avulsion fracture of tibia in a three year-old Iranian girl which misdiagnosed as osteosarcoma.展开更多
Organic-inorganic hybrid perovskites (OHPs) are well-known as light-absorbing materials in solar cells and have recently attracted considerable attention for the applications in resistive switching memory. Previous st...Organic-inorganic hybrid perovskites (OHPs) are well-known as light-absorbing materials in solar cells and have recently attracted considerable attention for the applications in resistive switching memory. Previous studies have shown that ions can migrate to form a conductive channel in perovskites under an external voltage. However, the exact resistance mechanism for Ag or halogens which dominate the resistive behavior is still controversial. Here, we demonstrate a resistive switching memory device based on Ag/FA0.83MA0.17Pb(I0.82Br0.18)3/fluorine doped tin oxide (FTO). The migration of Ag cations and halide anions is demonstrated by energy dispersive X-ray spectroscopy (EDS) after the SET process (positive voltage on Ag). By comparing the I-V behavior of the Au-based devices, it is clear that the conductive channel formed by Ag is the main factor of the switching characteristics for Ag-based devices. Meanwhile, by controlling the appropriate SET voltage, two kinds of resistance characteristics of the analog switch and threshold switch can be realized in the Ag-based device. As a result, it may be possible to implement both data storage and neuromorphic computing in a single device.展开更多
文摘Reactive lesions of bone and soft tissue can appear alarming on histologic examination because they are often cellular and have atypical cytologic features,such as distinct nucleoli,mild hyperchromasia,and mitotic activity.Reactive lesions of bone and periosteum also produce bone and cartilage matrix,resulting in confusion with osteosarcoma or chondrosarcoma.Careful attention to key cytomorphological features such as the pattern of bone formation,uniform appearance of cells,and absence of atypical mitoses should help identify the reactive nature of a lesion.Correlation with clinical and radiological findings is also imperative to avoid misclassification of the tumor because reactive lesions often arise at sites where osteosarcoma and chondrosarcoma are rare(eg,the hand)and lack aggressive radiological features.Here we present a case of exuberant callus formation after avulsion fracture of tibia in a three year-old Iranian girl which misdiagnosed as osteosarcoma.
基金the financial supports from the National Natural Science Foundation of China(51872036,51773025)Dalian Science and Technology Innovation Fund(2018J12GX033)National Key R&D Program of China(2017YFB0405604)
文摘Organic-inorganic hybrid perovskites (OHPs) are well-known as light-absorbing materials in solar cells and have recently attracted considerable attention for the applications in resistive switching memory. Previous studies have shown that ions can migrate to form a conductive channel in perovskites under an external voltage. However, the exact resistance mechanism for Ag or halogens which dominate the resistive behavior is still controversial. Here, we demonstrate a resistive switching memory device based on Ag/FA0.83MA0.17Pb(I0.82Br0.18)3/fluorine doped tin oxide (FTO). The migration of Ag cations and halide anions is demonstrated by energy dispersive X-ray spectroscopy (EDS) after the SET process (positive voltage on Ag). By comparing the I-V behavior of the Au-based devices, it is clear that the conductive channel formed by Ag is the main factor of the switching characteristics for Ag-based devices. Meanwhile, by controlling the appropriate SET voltage, two kinds of resistance characteristics of the analog switch and threshold switch can be realized in the Ag-based device. As a result, it may be possible to implement both data storage and neuromorphic computing in a single device.
