Dense arrays of Fe-Cr alloy clusters with different Cr ratios were fabricated by gas-phase cluster beam deposition. The complex multiphase structure and various coupling effects in the cluster arrays were studied. A l...Dense arrays of Fe-Cr alloy clusters with different Cr ratios were fabricated by gas-phase cluster beam deposition. The complex multiphase structure and various coupling effects in the cluster arrays were studied. A lattice mismatched tetragonal-like morphology of the Fe-Cr alloy cluster was observed at large Cr ratio. An exchange bias effect was observed and was shown to be dependent on the proportion of the Cr components in the alloy. With the increase of the Cr composition, the exchange bias field became smaller and stronger dipolar interactions between the clusters developed. Residual coercivity and magnetization, which were more remarkable in the tetragonal-like clusters, were observed above the ferromagnetic-superparamagnetic transition temperature. The experimental results of the coercive field and the bias field at different temperatures demonstrated that the tetragonal-like clusters had better thermal stability and greater anisotropy.展开更多
BACKGROUND Spinal intraosseous schwannomas(SIS)are rare,and as yet have not been fully described in the literature.The first case of SIS was reported in 1971,and 24 cases of SIS have been reported so far.However,inclu...BACKGROUND Spinal intraosseous schwannomas(SIS)are rare,and as yet have not been fully described in the literature.The first case of SIS was reported in 1971,and 24 cases of SIS have been reported so far.However,including the present case,there are only seven cases without spinal canal and neuroforamina involvement.CASE SUMMARY A 56-year-old man presented with a history of neck pain for 2 years.An obvious osteolytic destruction of the seventh cervical(C7)vertebra was observed on imaging examination.Magnetic resonance imaging of the cervical spine showed space-occupying lesions in the C7 vertebra,and destruction of the anterior cortex of the vertebra.The lesions had an exophytic component that extended from the C7 vertebra into the soft tissue on the front side.The foramen transversarium on both sides were intact.The patient underwent surgical biopsy and focal excision of the C7 lesion.The diagnosis of“schwannoma”was verified by postoperative pathological examinations.In a review of the literature,this is the seventh case of SIS without spinal canal and neuroforamina involvement,and the third reported case of type VIII SIS.We discussed our case with respect to reported classification characteristics of SIS.CONCLUSION SIS is a very rare tumor.We report a rare case that may be important for further classification of osteo-schwannoma.The establishment of a complete disease classification is of high importance for the treatment and prognosis of this disease.Thus,more basic studies and retrospective analysis of related cases are necessary.展开更多
基金supported by the National Natural Science Foundation of China(No.11627806 and No.61301015)the Priority Academic Programme Development of Jiangsu Higher Education Institutions
文摘Dense arrays of Fe-Cr alloy clusters with different Cr ratios were fabricated by gas-phase cluster beam deposition. The complex multiphase structure and various coupling effects in the cluster arrays were studied. A lattice mismatched tetragonal-like morphology of the Fe-Cr alloy cluster was observed at large Cr ratio. An exchange bias effect was observed and was shown to be dependent on the proportion of the Cr components in the alloy. With the increase of the Cr composition, the exchange bias field became smaller and stronger dipolar interactions between the clusters developed. Residual coercivity and magnetization, which were more remarkable in the tetragonal-like clusters, were observed above the ferromagnetic-superparamagnetic transition temperature. The experimental results of the coercive field and the bias field at different temperatures demonstrated that the tetragonal-like clusters had better thermal stability and greater anisotropy.
文摘BACKGROUND Spinal intraosseous schwannomas(SIS)are rare,and as yet have not been fully described in the literature.The first case of SIS was reported in 1971,and 24 cases of SIS have been reported so far.However,including the present case,there are only seven cases without spinal canal and neuroforamina involvement.CASE SUMMARY A 56-year-old man presented with a history of neck pain for 2 years.An obvious osteolytic destruction of the seventh cervical(C7)vertebra was observed on imaging examination.Magnetic resonance imaging of the cervical spine showed space-occupying lesions in the C7 vertebra,and destruction of the anterior cortex of the vertebra.The lesions had an exophytic component that extended from the C7 vertebra into the soft tissue on the front side.The foramen transversarium on both sides were intact.The patient underwent surgical biopsy and focal excision of the C7 lesion.The diagnosis of“schwannoma”was verified by postoperative pathological examinations.In a review of the literature,this is the seventh case of SIS without spinal canal and neuroforamina involvement,and the third reported case of type VIII SIS.We discussed our case with respect to reported classification characteristics of SIS.CONCLUSION SIS is a very rare tumor.We report a rare case that may be important for further classification of osteo-schwannoma.The establishment of a complete disease classification is of high importance for the treatment and prognosis of this disease.Thus,more basic studies and retrospective analysis of related cases are necessary.
