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BHW-35钢焊缝熔敷金属热处理脆化机理研究 被引量:1
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作者 陈浩 潘春旭 《机械工程材料》 CAS CSCD 北大核心 2002年第6期19-22,共4页
用于高参数锅炉的BHW 35钢采用窄间隙埋弧焊 ,在焊后热处理后其焊缝冲击韧性大幅下降。利用扫描电镜 (SEM )和透射电镜 (TEM ) ,对焊缝熔敷金属焊后热处理前后的显微组织变化进行研究 ,找出其冲击韧性下降原因。结果表明 :BHW 35钢焊缝... 用于高参数锅炉的BHW 35钢采用窄间隙埋弧焊 ,在焊后热处理后其焊缝冲击韧性大幅下降。利用扫描电镜 (SEM )和透射电镜 (TEM ) ,对焊缝熔敷金属焊后热处理前后的显微组织变化进行研究 ,找出其冲击韧性下降原因。结果表明 :BHW 35钢焊缝焊态时组织为针状铁素体 ,在晶内有细小碳化物弥散分布 ;经焊后热处理后 ,针状铁素体变为块状 ,碳化物在晶界大量析出 ,导致晶界脆化和冲击韧性下降。 展开更多
关键词 BHW-35 窄间隙埋孤焊 冲击韧性 焊后热处理 脆代
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Fragile X syndrome and epilepsy
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作者 邱立枫 郝艳红 +1 位作者 李庆章 熊志奇 《Neuroscience Bulletin》 SCIE CAS CSCD 2008年第5期338-344,共7页
Fragile X syndrome (FXS) is one of the most prevalent mental retardations. It is mainly caused by the loss of fragile X mental retardation protein (FMRP). FMRP is an RNA binding protein and can regulate the transl... Fragile X syndrome (FXS) is one of the most prevalent mental retardations. It is mainly caused by the loss of fragile X mental retardation protein (FMRP). FMRP is an RNA binding protein and can regulate the translation of its binding RNA, thus regulate several signaling pathways. Many FXS patients show high susceptibility to epilepsy. Epilepsy is a chronic neurological disorder which is characterized by the recurrent appearance of spontaneous seizures due to neuronal hyperactivity in the brain. Both the abnormal activation of several signaling pathway and morphological abnormality that are caused by the loss of FMRP can lead to a high susceptibility to epilepsy. Combining with the research progresses on both FXS and epilepsy, we outlined the possible mechanisms of high susceptibility to epilepsy in FXS and tried to give a prospect on the future research on the mechanism of epilepsy that happened in other mental retardations. 展开更多
关键词 EPILEPSY fragile X mental retardation protein metabotropic glutamate receptor y-aminobutyric acid dendritic spines
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