Polycrystalline titanium oxide films are fabricated on silicon by thermally oxidizing titanium.The current- voltage and capacitance- voltage characteristics of the Ag/Ti Ox/Si/Ag capacitors are m easured.The thicknes...Polycrystalline titanium oxide films are fabricated on silicon by thermally oxidizing titanium.The current- voltage and capacitance- voltage characteristics of the Ag/Ti Ox/Si/Ag capacitors are m easured.The thickness of the titanium oxide films arranges from15 0 nm to2 5 0 nm,and their dielectric constants are within40～ 87.As the oxida- tion tim e is shortened,the fixed charges of the titanium oxide films become less and the leakage current characteris- tics becom e better.展开更多
Considering the research on classical genetics of photoperiod(therm) sensitive genic male sterile rice, it is important to select the sterile lines and their segregating population controlled by one pair of gene in ma...Considering the research on classical genetics of photoperiod(therm) sensitive genic male sterile rice, it is important to select the sterile lines and their segregating population controlled by one pair of gene in mapping and isolating sterile genes. It is discussed the advantages, disadvantages and the reasons leading to various mapping results of chromosome location of sterile genes through gene marker, isozyme marker and DNA marker techniques. In comparison to isolation of photo(thermo) sensitive sterile genes via various plant gene cloning techniques, it was concluded that map based cloning was acceptable, but it is still difficult to locate the loci of sterile genes within 1cM. On the other hand, “sensitivity to environment”, an important characteristic of sterile lines can be fully utilized by DD PCR and (or) RDA techniques. Therefore, these two techniques were considered as the effective ways to isolate sterile genes.展开更多
The therm istor problem is an initial-boundary value problem ofcoupled nonlineardif- ferentialequations.The nonlinear PDEs consist of a heat equation w ith the Joule heating as a source and a currentconservation equ...The therm istor problem is an initial-boundary value problem ofcoupled nonlineardif- ferentialequations.The nonlinear PDEs consist of a heat equation w ith the Joule heating as a source and a currentconservation equation w ith tem perature-dependentelectricalconductivity. This problem has im portant applications in industry.In this paper,A new finite difference schem e is proposed on nonuniform rectangularpartition forthe therm istor problem .In thetheo- reticalanalyses,the second-order error estim ates are obtained for electricalpotentialin discrete L2 and H1 norm s,and for the tem perature in L2 norm .In order to getthese second-order error estim ates,the Joule heating source is used in a changed equivalentform .展开更多
Tin sulfide (SnS) has analogous structural features to tin selenide (SnSe), but contains more abundant resources as compared with SnSe. SnS has elicited attention as a potential eco-friendly therm oelectric (TE) mater...Tin sulfide (SnS) has analogous structural features to tin selenide (SnSe), but contains more abundant resources as compared with SnSe. SnS has elicited attention as a potential eco-friendly therm oelectric (TE) material. However, the intrinsic carrier concentration of SnS is very low, thereby hindering the performance improvement of the material. This study proposes that the TE properties of polycrystalline Nadoped SnS (synthesized through an improved chemical coprecipitation) can be significantly enhanced. The maximum power factor (PF) of 362 μW m^-1K^-2 at 873 K was achieved, presenting a state-of-the-art value for the polycrystalline SnS. Considering the merits of the improved electrical properties and lower thermal conductivity of SnS, the highest ZT was up to 0.52 at 873 K even without intentional chemical doping. This study offers an effective approach for improving the PF to achieve high ZT in SnS. Hence, we expect that this new perspective can be extended to other dopants and broaden the scope of synthesis technology.展开更多
It is well known that heteropolyacids (salts) function as catalysts in various respects. It is interesting to examine their chemical and structural properties as well as their change during reactions for understanding...It is well known that heteropolyacids (salts) function as catalysts in various respects. It is interesting to examine their chemical and structural properties as well as their change during reactions for understanding their catalytic characteristics. Attention is usually paid to the thermal stability of solid heteropolyacids (salts) in展开更多
The thermal cross-linking of 1.4-polybutadiene has been studied extensively, while the cross-linking on oxidation in this polymer has received much less attention. Recently, the exothermic interreaction of cis-1,4-pol...The thermal cross-linking of 1.4-polybutadiene has been studied extensively, while the cross-linking on oxidation in this polymer has received much less attention. Recently, the exothermic interreaction of cis-1,4-polybutadiene (CB) and phenolic resin in surface layer of polymer asbestos friction materials after sliding has been observed by Gong, Wang and Du. The present work focuses upon the effect of phenolic resin (Novolak) on the microstructural changes in展开更多
As the thickness of the overburden increases, the temperature of the evaporites gradually rises, and the primary hydrous minerals tend to dihydrate and incongruently melt to form new mineral assemblages. This process ...As the thickness of the overburden increases, the temperature of the evaporites gradually rises, and the primary hydrous minerals tend to dihydrate and incongruently melt to form new mineral assemblages. This process can be called geothermal metamorphism and can be clarified by polythermal diagram of stable equilibrium. When we studied the geothermal metamorphism of some salt paragenesis in China, we展开更多
We read with great interest the article by van Rijn et al.published in March 2021,in The New England Journal of Medicine(1).In this multicenter,randomized controlled trial,the authors investigated the efficacy of dual...We read with great interest the article by van Rijn et al.published in March 2021,in The New England Journal of Medicine(1).In this multicenter,randomized controlled trial,the authors investigated the efficacy of dual hypothermic oxygenated perfusion(D-HOPE)versus static cold storage(SCS)in grafts from donors after cardiac death(DCD)to decrease the rate of non-anastomotic biliary stenosis(NAS)within the first 6 post-transplant months.展开更多
The adsorption equilibria of N<sub>2</sub>,Ar,CH<sub>4</sub>,CO<sub>2</sub>,and N<sub>2</sub>O on H-Mordenite were studied with a constant volume appa-ratus under pressu...The adsorption equilibria of N<sub>2</sub>,Ar,CH<sub>4</sub>,CO<sub>2</sub>,and N<sub>2</sub>O on H-Mordenite were studied with a constant volume appa-ratus under pressure from 3.04×10<sup>3</sup> to 1.43×10<sup>7</sup> Pa at—196°,0°,25°,50° and 75℃.The amount of adsorption ofN<sub>2</sub>,Ar and CH<sub>4</sub> increases with pressure until approaching saturation at about 6.08×10<sup>6</sup> Pa.A maximum exists on theadsorption isotherm of CO<sub>2</sub> and N<sub>2</sub>O,and their isotherms at different temperatures cross each other.All the data obtainedin this work can be correlated by the extended adsorption potential theory quite well.All experimental points can be repre-sented by the generalized characteristic curve.展开更多
文摘Polycrystalline titanium oxide films are fabricated on silicon by thermally oxidizing titanium.The current- voltage and capacitance- voltage characteristics of the Ag/Ti Ox/Si/Ag capacitors are m easured.The thickness of the titanium oxide films arranges from15 0 nm to2 5 0 nm,and their dielectric constants are within40～ 87.As the oxida- tion tim e is shortened,the fixed charges of the titanium oxide films become less and the leakage current characteris- tics becom e better.
文摘Considering the research on classical genetics of photoperiod(therm) sensitive genic male sterile rice, it is important to select the sterile lines and their segregating population controlled by one pair of gene in mapping and isolating sterile genes. It is discussed the advantages, disadvantages and the reasons leading to various mapping results of chromosome location of sterile genes through gene marker, isozyme marker and DNA marker techniques. In comparison to isolation of photo(thermo) sensitive sterile genes via various plant gene cloning techniques, it was concluded that map based cloning was acceptable, but it is still difficult to locate the loci of sterile genes within 1cM. On the other hand, “sensitivity to environment”, an important characteristic of sterile lines can be fully utilized by DD PCR and (or) RDA techniques. Therefore, these two techniques were considered as the effective ways to isolate sterile genes.
文摘The therm istor problem is an initial-boundary value problem ofcoupled nonlineardif- ferentialequations.The nonlinear PDEs consist of a heat equation w ith the Joule heating as a source and a currentconservation equation w ith tem perature-dependentelectricalconductivity. This problem has im portant applications in industry.In this paper,A new finite difference schem e is proposed on nonuniform rectangularpartition forthe therm istor problem .In thetheo- reticalanalyses,the second-order error estim ates are obtained for electricalpotentialin discrete L2 and H1 norm s,and for the tem perature in L2 norm .In order to getthese second-order error estim ates,the Joule heating source is used in a changed equivalentform .
基金supported by the National Key R&D Program of China (2018YFB0703603)the Basic Science Center Project of National Natural Science Foundation of China (NSFC, 51788104)the NSFC (11474176)
文摘Tin sulfide (SnS) has analogous structural features to tin selenide (SnSe), but contains more abundant resources as compared with SnSe. SnS has elicited attention as a potential eco-friendly therm oelectric (TE) material. However, the intrinsic carrier concentration of SnS is very low, thereby hindering the performance improvement of the material. This study proposes that the TE properties of polycrystalline Nadoped SnS (synthesized through an improved chemical coprecipitation) can be significantly enhanced. The maximum power factor (PF) of 362 μW m^-1K^-2 at 873 K was achieved, presenting a state-of-the-art value for the polycrystalline SnS. Considering the merits of the improved electrical properties and lower thermal conductivity of SnS, the highest ZT was up to 0.52 at 873 K even without intentional chemical doping. This study offers an effective approach for improving the PF to achieve high ZT in SnS. Hence, we expect that this new perspective can be extended to other dopants and broaden the scope of synthesis technology.
文摘It is well known that heteropolyacids (salts) function as catalysts in various respects. It is interesting to examine their chemical and structural properties as well as their change during reactions for understanding their catalytic characteristics. Attention is usually paid to the thermal stability of solid heteropolyacids (salts) in
文摘The thermal cross-linking of 1.4-polybutadiene has been studied extensively, while the cross-linking on oxidation in this polymer has received much less attention. Recently, the exothermic interreaction of cis-1,4-polybutadiene (CB) and phenolic resin in surface layer of polymer asbestos friction materials after sliding has been observed by Gong, Wang and Du. The present work focuses upon the effect of phenolic resin (Novolak) on the microstructural changes in
文摘As the thickness of the overburden increases, the temperature of the evaporites gradually rises, and the primary hydrous minerals tend to dihydrate and incongruently melt to form new mineral assemblages. This process can be called geothermal metamorphism and can be clarified by polythermal diagram of stable equilibrium. When we studied the geothermal metamorphism of some salt paragenesis in China, we
文摘We read with great interest the article by van Rijn et al.published in March 2021,in The New England Journal of Medicine(1).In this multicenter,randomized controlled trial,the authors investigated the efficacy of dual hypothermic oxygenated perfusion(D-HOPE)versus static cold storage(SCS)in grafts from donors after cardiac death(DCD)to decrease the rate of non-anastomotic biliary stenosis(NAS)within the first 6 post-transplant months.
文摘The adsorption equilibria of N<sub>2</sub>,Ar,CH<sub>4</sub>,CO<sub>2</sub>,and N<sub>2</sub>O on H-Mordenite were studied with a constant volume appa-ratus under pressure from 3.04×10<sup>3</sup> to 1.43×10<sup>7</sup> Pa at—196°,0°,25°,50° and 75℃.The amount of adsorption ofN<sub>2</sub>,Ar and CH<sub>4</sub> increases with pressure until approaching saturation at about 6.08×10<sup>6</sup> Pa.A maximum exists on theadsorption isotherm of CO<sub>2</sub> and N<sub>2</sub>O,and their isotherms at different temperatures cross each other.All the data obtainedin this work can be correlated by the extended adsorption potential theory quite well.All experimental points can be repre-sented by the generalized characteristic curve.
