A thermodynamic theory about the dependence of morphology of SiOx nanowires on the super-saturation of alloy liquid droplets has been proposed on the basis of the vapour-liquid-solid growth mechanism and has been supp...A thermodynamic theory about the dependence of morphology of SiOx nanowires on the super-saturation of alloy liquid droplets has been proposed on the basis of the vapour-liquid-solid growth mechanism and has been supported experimentally. By changing the Si concentration in the Au-Si liquid droplets formed on the Au-coated Si substrate, firework-, tulip- and bud-shaped SiOx nanowires were synthesized by a thermal evaporation method and distributed concentrically around some void defects in the Si substrate. Voids were formed underneath the surface of the Si substrate during the thermal evaporation at 850℃ and resulted in the Si-concentration deficient thus different saturation of Au-Si droplets. Electron microscopy analysis showed that the nanowires had an amorphous structure and were terminated by Au-Si particles.展开更多
The endothelial cells of the corneas of rabbits preserved by desiccation for vari-ous duration showed no hexagonal form of normal cells but broad bean-like nuclci afterdouble staining with alizarin red and trypan blue...The endothelial cells of the corneas of rabbits preserved by desiccation for vari-ous duration showed no hexagonal form of normal cells but broad bean-like nuclci afterdouble staining with alizarin red and trypan blue.Scanning electron microscopic examina-tion revealed interdigitation at the intercellular junction together with intercellularvacuoles and cellular edema.Transmission electron microscopic examination showedincomplete nuclear membrane,karyopyknosis,vacuoles and remnant organellae in thecytoplasm.Partial penetrating keratoplasties were done in 37 rabbits(37 eyes)with pre-served corneas.The grafts remained transparent for a minimum of 4 days to a maximumof over 1 year,and 7 grafts remained transparent for more than 30 days.Staining ofthe transparent grafts revealed normal hexagonal endothelial cells in mosaic arrange-ment.We assumed that after transplantation of the preserved cornea the endothelial cellsregained their activities owing to the nutrient effect of the aqueous humor.展开更多
This paper is to report the pathological changes of canine renal tissuesin the period of 48h after severe steam inhalation burns.All the specimens from84 male mongrel dogs were observed with light microscopy,and 30 ou...This paper is to report the pathological changes of canine renal tissuesin the period of 48h after severe steam inhalation burns.All the specimens from84 male mongrel dogs were observed with light microscopy,and 30 out of the 84with electron microscopy additionally.The morphological changes of the glomeriwere characterized by hypertrophy and/or hyperplasia,and retrogressive changesof glomerular cells.The former manifested itself as cell enlargement and an in-crease of the amount of cytoplasm and of the number or organelles.The latterwas evidenced as intracellular edema.The renal tubules showed a varying degreeof degeneration,necrosis,and cast formation.Tubular necrosis affected more fre-quently the proximal convoluted tubules,of which the etiological factors were dis-cussed briefly.展开更多
It was observed with transmission electron microscopy in the In_(0.52)Al_(0.48)As/In_(x)Ga_(1-x)As/In_(0.52)Al(0.48)As/InP heterostructure that misfit dislocation lines deviate from the<110>directions at a certa...It was observed with transmission electron microscopy in the In_(0.52)Al_(0.48)As/In_(x)Ga_(1-x)As/In_(0.52)Al(0.48)As/InP heterostructure that misfit dislocation lines deviate from the<110>directions at a certain angle depending on the indium content x.Such an abnormal alignment of misfit dislocations is explained in terms of an alloy effect on the formation of single jogs on the misfit dislocations in the interface between the Ⅲ-Ⅳ ternary compounds.展开更多
By conventional air-cooled casting method,cast ingots with large contents of stable Mg-Zn-Y quasicrystals were obtained.It was shown that most of the quasicrystals are of face-centered icosahedral type,while a few of ...By conventional air-cooled casting method,cast ingots with large contents of stable Mg-Zn-Y quasicrystals were obtained.It was shown that most of the quasicrystals are of face-centered icosahedral type,while a few of them belong to simple icosahedral type.The quasicrystals were stable during the continuous heating with the temperature below 868K.The oxidizing reactions were observed at high temperature.This is the characteristic of Mg-Zn-Y alloys,which differs from that of A1 base alloys.展开更多
Epitaxial diamond films on non-mirror polished silicon substrate was achieved using hot filament chemical vapor deposition method with one flat horizontal filament.The orientation relationship of epitaxial diamond fil...Epitaxial diamond films on non-mirror polished silicon substrate was achieved using hot filament chemical vapor deposition method with one flat horizontal filament.The orientation relationship of epitaxial diamond films on silicon substrate has been investigated by cross-sectional high-resolution transmission electron microscopy We found one excellent epitaxial configuration and according to the experimental result we suggest a corresponding model.The lattice misfit is only 0.1-2.8% related to our model and the analysis of 60° type interface dislocation also supports this model.展开更多
基金Supported by the National Natural Science Foundation of China,and the Chinese Academy of Sciences.
文摘A thermodynamic theory about the dependence of morphology of SiOx nanowires on the super-saturation of alloy liquid droplets has been proposed on the basis of the vapour-liquid-solid growth mechanism and has been supported experimentally. By changing the Si concentration in the Au-Si liquid droplets formed on the Au-coated Si substrate, firework-, tulip- and bud-shaped SiOx nanowires were synthesized by a thermal evaporation method and distributed concentrically around some void defects in the Si substrate. Voids were formed underneath the surface of the Si substrate during the thermal evaporation at 850℃ and resulted in the Si-concentration deficient thus different saturation of Au-Si droplets. Electron microscopy analysis showed that the nanowires had an amorphous structure and were terminated by Au-Si particles.
文摘The endothelial cells of the corneas of rabbits preserved by desiccation for vari-ous duration showed no hexagonal form of normal cells but broad bean-like nuclci afterdouble staining with alizarin red and trypan blue.Scanning electron microscopic examina-tion revealed interdigitation at the intercellular junction together with intercellularvacuoles and cellular edema.Transmission electron microscopic examination showedincomplete nuclear membrane,karyopyknosis,vacuoles and remnant organellae in thecytoplasm.Partial penetrating keratoplasties were done in 37 rabbits(37 eyes)with pre-served corneas.The grafts remained transparent for a minimum of 4 days to a maximumof over 1 year,and 7 grafts remained transparent for more than 30 days.Staining ofthe transparent grafts revealed normal hexagonal endothelial cells in mosaic arrange-ment.We assumed that after transplantation of the preserved cornea the endothelial cellsregained their activities owing to the nutrient effect of the aqueous humor.
文摘This paper is to report the pathological changes of canine renal tissuesin the period of 48h after severe steam inhalation burns.All the specimens from84 male mongrel dogs were observed with light microscopy,and 30 out of the 84with electron microscopy additionally.The morphological changes of the glomeriwere characterized by hypertrophy and/or hyperplasia,and retrogressive changesof glomerular cells.The former manifested itself as cell enlargement and an in-crease of the amount of cytoplasm and of the number or organelles.The latterwas evidenced as intracellular edema.The renal tubules showed a varying degreeof degeneration,necrosis,and cast formation.Tubular necrosis affected more fre-quently the proximal convoluted tubules,of which the etiological factors were dis-cussed briefly.
文摘It was observed with transmission electron microscopy in the In_(0.52)Al_(0.48)As/In_(x)Ga_(1-x)As/In_(0.52)Al(0.48)As/InP heterostructure that misfit dislocation lines deviate from the<110>directions at a certain angle depending on the indium content x.Such an abnormal alignment of misfit dislocations is explained in terms of an alloy effect on the formation of single jogs on the misfit dislocations in the interface between the Ⅲ-Ⅳ ternary compounds.
基金Supported by the Aeronautical Scieii e Foundation of China.
文摘By conventional air-cooled casting method,cast ingots with large contents of stable Mg-Zn-Y quasicrystals were obtained.It was shown that most of the quasicrystals are of face-centered icosahedral type,while a few of them belong to simple icosahedral type.The quasicrystals were stable during the continuous heating with the temperature below 868K.The oxidizing reactions were observed at high temperature.This is the characteristic of Mg-Zn-Y alloys,which differs from that of A1 base alloys.
基金Supported by the National Natural Science Foundation of China.
文摘Epitaxial diamond films on non-mirror polished silicon substrate was achieved using hot filament chemical vapor deposition method with one flat horizontal filament.The orientation relationship of epitaxial diamond films on silicon substrate has been investigated by cross-sectional high-resolution transmission electron microscopy We found one excellent epitaxial configuration and according to the experimental result we suggest a corresponding model.The lattice misfit is only 0.1-2.8% related to our model and the analysis of 60° type interface dislocation also supports this model.
