Friction stir extrusion(FSE)is known as an innovative manufacturing technology that makes it possible to directly produce wire via consolidation and extrusion of metal chips or solid billets.In this study,wire samples...Friction stir extrusion(FSE)is known as an innovative manufacturing technology that makes it possible to directly produce wire via consolidation and extrusion of metal chips or solid billets.In this study,wire samples were produced using aluminum alloy AA7022 machining chips by the use of the FSE.To this end,the microstructures and mechanical properties of the base material(BM)and the extruded samples were investigated.The corrosion resistance of the given samples was also determined using potentiodynamic polarization technique.The results showed that the samples manufactured at higher rotational speeds possessed good surface quality,the process temperature and the grain size similarly increased following the rise in rotational speed,and the mechanical properties consequently decreased.Using the FSE led to crystallite refinement,increase in volume fraction of grain boundaries,as well as re-distribution of precipitates affecting corrosion resistance.Furthermore,the findings of the corrosion tests revealed that the produced samples by the FSE had adequate corrosion resistance and the growth in die rotation rate augmented current density and subsequently reduced corrosion resistance.展开更多
Listeriosis is an infection caused b y the bacterium Listeriamonocytogenes.In pregnancy listeriosis may result in abortion,still -birth,premature d elivery or severe neonatal infection.Clinical manifestations of mater...Listeriosis is an infection caused b y the bacterium Listeriamonocytogenes.In pregnancy listeriosis may result in abortion,still -birth,premature d elivery or severe neonatal infection.Clinical manifestations of maternal lis-teriosis are often influenza -like s ymptoms.We present a case of listeriosis in a triplet pregnancy with abortion of the1st and 2nd fetus and the birth of a healthy 3rd child in the25th week of gestation.展开更多
We report the case of a 70- year-old white male with an extensive recurrence of lentigo maligna in a skin-transplanted region. He was treated with imiquimod 5% cream topically applied 5 times a week for a total durati...We report the case of a 70- year-old white male with an extensive recurrence of lentigo maligna in a skin-transplanted region. He was treated with imiquimod 5% cream topically applied 5 times a week for a total duration of 9 months. Clinically and histologically, a complete clearing of the lesion was observed after treatment. Topical treatment with imiquimod seems to be effective and safe in lentigo maligna.展开更多
文摘Friction stir extrusion(FSE)is known as an innovative manufacturing technology that makes it possible to directly produce wire via consolidation and extrusion of metal chips or solid billets.In this study,wire samples were produced using aluminum alloy AA7022 machining chips by the use of the FSE.To this end,the microstructures and mechanical properties of the base material(BM)and the extruded samples were investigated.The corrosion resistance of the given samples was also determined using potentiodynamic polarization technique.The results showed that the samples manufactured at higher rotational speeds possessed good surface quality,the process temperature and the grain size similarly increased following the rise in rotational speed,and the mechanical properties consequently decreased.Using the FSE led to crystallite refinement,increase in volume fraction of grain boundaries,as well as re-distribution of precipitates affecting corrosion resistance.Furthermore,the findings of the corrosion tests revealed that the produced samples by the FSE had adequate corrosion resistance and the growth in die rotation rate augmented current density and subsequently reduced corrosion resistance.
文摘Listeriosis is an infection caused b y the bacterium Listeriamonocytogenes.In pregnancy listeriosis may result in abortion,still -birth,premature d elivery or severe neonatal infection.Clinical manifestations of maternal lis-teriosis are often influenza -like s ymptoms.We present a case of listeriosis in a triplet pregnancy with abortion of the1st and 2nd fetus and the birth of a healthy 3rd child in the25th week of gestation.
文摘We report the case of a 70- year-old white male with an extensive recurrence of lentigo maligna in a skin-transplanted region. He was treated with imiquimod 5% cream topically applied 5 times a week for a total duration of 9 months. Clinically and histologically, a complete clearing of the lesion was observed after treatment. Topical treatment with imiquimod seems to be effective and safe in lentigo maligna.
