Influence of heat treatment on the microstructures and mechanical properties of sand-cast Mg-4Y-2Nd-1Gd-0.4Zr magnesium alloy was investigated,and the tensile fracture mechanisms of the studied alloys under different ...Influence of heat treatment on the microstructures and mechanical properties of sand-cast Mg-4Y-2Nd-1Gd-0.4Zr magnesium alloy was investigated,and the tensile fracture mechanisms of the studied alloys under different conditions were also discussed.The results show that the optimum T4 and T6 heat treatment conditions for the as-cast Mg-4Y-2Nd-1Gd-0.4Zr alloy are 525°C,8 h and（525°C,8 h）＋（225°C,16 h）,respectively,with regard to the microstructure observation,DSC heating curve and mechanical properties.The hardness,yield strength,ultimate tensile strength and elongation of the Mg-4Y-2Nd-1Gd-0.4Zr alloy treated by optimum T6 heat treatment are HV91,180 MPa,297 MPa and 7.4%,respectively.Moreover,the Mg-4Y-2Nd-1Gd-0.4Zr alloys under different heat treatment conditions exhibit different tensile fracture modes.展开更多
<div style="text-align:justify;"> Based on the detailed interpretation of high-accuracy 3D seismic data, the characteristics of regional unconformities, fracture systems, sedimentary filling and paleo-...<div style="text-align:justify;"> Based on the detailed interpretation of high-accuracy 3D seismic data, the characteristics of regional unconformities, fracture systems, sedimentary filling and paleo-stress field in Zhu 1 depression were comprehensively analyzed. The results showed that 2nd episode of Zhu-Qiong movement was an important tectonic transformation that occurred during rifting, basin structure patterns above and below the regional angular unconformity caused by 2nd episode had distinct differences. The orientations of those basin-controlling faults changed from NE, NEE to EW, NWW, which indicated that the paleo-stress field veered from NNW extension clockwise to sub-NS extension and basin structures patterns transformed from NE, NEE strong rifting to sub-EW, NWW weak rifting. The depocenter showed seesaw-like migration from S to N. And the sedimentary systems transformed from semi-deep-deep lacustrine facies to braided river delta facies developed in shore-shallow lacustrine. Combined with its tectonic recombination of periphery plates that period, the mechanism of above tectonic transformation had direct correspondence to the readjustment of the Indian plate and the Pacific plate. The southward subduction of the pro-to-south China Sea is the direct cause of this tectonic transformation. </div>展开更多
The modern research on basic concept inTCM deeply explored The papers in this congress are referring tothe research on Zhenghou(syndrome)theory,Five Element theory and Four Diagnosis theory by
The 2nd International Conference on Rare Earth Development and Applications(ICRE’91),which wassponsored by the Chinese Society of Rare Earths,was held at Beijing International Convention Centre fromMay 27 through May...The 2nd International Conference on Rare Earth Development and Applications(ICRE’91),which wassponsored by the Chinese Society of Rare Earths,was held at Beijing International Convention Centre fromMay 27 through May 31,1991.290 scientists attended this conference,among them there were 63 foreign sci-entists.Prof.Yu Zongsen,vice-chairman of the Chinese Society of Rare Earths,presided over the openingceremony.Mr.Xu Daquan,deputy director of the Rare Earth Leading Group of the State Council,vice-minister展开更多
ZTE Corporation announced on March 31, 2008 that it has been ranked second in terms of CDMA equipment competitiveness by the Yankee Group in a report entitled "ZTE Shines in CDMA Market" published by the res...ZTE Corporation announced on March 31, 2008 that it has been ranked second in terms of CDMA equipment competitiveness by the Yankee Group in a report entitled "ZTE Shines in CDMA Market" published by the research firm in February this year. According to the report, ZTE is the most competitive telecom vendor in China, India, emerging Asia-Pacific market, Africa and Eastern Europe. ZTE tallied the highest score in four out of seven categories the Yankee Group used to measure the CDMA competitiveness of each vendor. The seven key evaluation factors were price, technology, existing installed base, product portfolio, integration capability, government support and company culture.展开更多
On October 1,co-spon- sored by the China Council for the Pro- motion of Intenational Trade(CCPIT),the All-China Women's Federation(ACWF) and the Brand China Industry Alliance(Brand China),the 2nd Chinese Brand Fes...On October 1,co-spon- sored by the China Council for the Pro- motion of Intenational Trade(CCPIT),the All-China Women's Federation(ACWF) and the Brand China Industry Alliance(Brand China),the 2nd Chinese Brand Festival was solemnly opened at the National Indoor Stadium.Nearly 20,000 entrepreneurs,brand experts,展开更多
The 2nd Chinese-Soviet Conference on Chemistry and Application Rare Earths was held at ChangchunInstitute of Applied Chemistry, Academia Sinica, and Shanghai Institute of Metallurgy, Academia Sinica,China, on October ...The 2nd Chinese-Soviet Conference on Chemistry and Application Rare Earths was held at ChangchunInstitute of Applied Chemistry, Academia Sinica, and Shanghai Institute of Metallurgy, Academia Sinica,China, on October 5～11, 1991. 10 representatives from USSR attended the conference. There were 47Chinese representatives in Changchun Conference and 77 in Shanghai Conference respectively, Prof. Nijiazan, Chinese chief representative, gave a lecture entitled“Progress and Research on Rare Earth Chemistryin China”, and Prof. I.A. Smirnov gave another lecture entitled“Physico-Chemical Investigation and Per-spective of Practical Application of CeO-PrO”.展开更多
In this paper,the forecasting equations of a 2nd-order space-time differential remainder are deduced from the Navier-Stokes primitive equations and Eulerian operator by Taylor-series expansion.Here we introduce a cubi...In this paper,the forecasting equations of a 2nd-order space-time differential remainder are deduced from the Navier-Stokes primitive equations and Eulerian operator by Taylor-series expansion.Here we introduce a cubic spline numerical model(Spline Model for short),which is with a quasi-Lagrangian time-split integration scheme of fitting cubic spline/bicubic surface to all physical variable fields in the atmospheric equations on spherical discrete latitude-longitude mesh.A new algorithm of"fitting cubic spline—time step integration—fitting cubic spline—……"is developed to determine their first-and2nd-order derivatives and their upstream points for time discrete integral to the governing equations in Spline Model.And the cubic spline function and its mathematical polarities are also discussed to understand the Spline Model’s mathematical foundation of numerical analysis.It is pointed out that the Spline Model has mathematical laws of"convergence"of the cubic spline functions contracting to the original functions as well as its 1st-order and 2nd-order derivatives.The"optimality"of the 2nd-order derivative of the cubic spline functions is optimal approximation to that of the original functions.In addition,a Hermite bicubic patch is equivalent to operate on a grid for a 2nd-order derivative variable field.Besides,the slopes and curvatures of a central difference are identified respectively,with a smoothing coefficient of 1/3,three-point smoothing of that of a cubic spline.Then the slopes and curvatures of a central difference are calculated from the smoothing coefficient 1/3 and three-point smoothing of that of a cubic spline,respectively.Furthermore,a global simulation case of adiabatic,non-frictional and"incompressible"model atmosphere is shown with the quasi-Lagrangian time integration by using a global Spline Model,whose initial condition comes from the NCEP reanalysis data,along with quasi-uniform latitude-longitude grids and the so-called"shallow atmosphere"Navier-Stokes primitive equations in the spherical coordinates.The Spline Model,which adopted the Navier-Stokes primitive equations and quasi-Lagrangian time-split integration scheme,provides an initial ideal case of global atmospheric circulation.In addition,considering the essentially non-linear atmospheric motions,the Spline Model could judge reasonably well simple points of any smoothed variable field according to its fitting spline curvatures that must conform to its physical interpretation.展开更多
In this paper a singularly perturbed linear second order hyperbolic problem with zeroth order reduced equation is discussed. Firstly, an energy inequality of the solution and an estimate of the remainder term of the a...In this paper a singularly perturbed linear second order hyperbolic problem with zeroth order reduced equation is discussed. Firstly, an energy inequality of the solution and an estimate of the remainder term of the asymptotic solution are given. Then an exponentially fitted difference scheme is developed in an equidistant mesh. Finally, uniform convergence in small parameter is proved in the sense of discrete energy norm.展开更多
The 2nd Member of Kongdian Formation has been made up of a large number of oil shale and mudstone in the Kongnan aera of Huanghua depression around the Bohai Bay.In the Kongnan area,the lake basins were very large and...The 2nd Member of Kongdian Formation has been made up of a large number of oil shale and mudstone in the Kongnan aera of Huanghua depression around the Bohai Bay.In the Kongnan area,the lake basins were very large and deep during the deposition of the 2nd Member of Kongdian Formation.During that period,the lakes were sealed,uncommunicated with the sea water and the paleoclimate was very warm and wet in Kongnan area.Analyzing the content of the trace element and the rare earth element,carbon and oxygen isotope in the disquisition,The authors prove the two views correct.展开更多
On behalf of the Organizing Committee,it is our great pleasure to invite you to the 2rid Asian Congress of Abdominal Radiology to be held in Seoul,Korea,on June 5-6,2009. The Asian Society of Abdominal Radiology (ASAR...On behalf of the Organizing Committee,it is our great pleasure to invite you to the 2rid Asian Congress of Abdominal Radiology to be held in Seoul,Korea,on June 5-6,2009. The Asian Society of Abdominal Radiology (ASAR) is a non-political,non-profit society of physi- ciaus and scientists interested in Abdominal Radiology.ACAR'2009 hosted by ASAR and the ACAR' 2009 Organizing Committee will be the place to advance the study of abdominal radiology and its associated diseases by encouraging teaching,research and further education in the subspecialty,and to encourage the harmonious interchange and integration of all Asian Radiologists with an interest in this field.An- other highlight of the congress will be a technical exhibition where you can get a glimpse of radiology innovation through direct contacts with the radiology industry. E-mail:info@ acar2009.org;www.acar2009.展开更多
基金Project(0502)supported by the Aerospace Science and Technology Innovation Fund of China Aerospace Science and Technology CorporationProject(2007CB613701)supported by the National Basic Research Program of ChinaProject(2009AA033501)supported by the National High-tech Research and Development Program of China
文摘Influence of heat treatment on the microstructures and mechanical properties of sand-cast Mg-4Y-2Nd-1Gd-0.4Zr magnesium alloy was investigated,and the tensile fracture mechanisms of the studied alloys under different conditions were also discussed.The results show that the optimum T4 and T6 heat treatment conditions for the as-cast Mg-4Y-2Nd-1Gd-0.4Zr alloy are 525°C,8 h and（525°C,8 h）＋（225°C,16 h）,respectively,with regard to the microstructure observation,DSC heating curve and mechanical properties.The hardness,yield strength,ultimate tensile strength and elongation of the Mg-4Y-2Nd-1Gd-0.4Zr alloy treated by optimum T6 heat treatment are HV91,180 MPa,297 MPa and 7.4%,respectively.Moreover,the Mg-4Y-2Nd-1Gd-0.4Zr alloys under different heat treatment conditions exhibit different tensile fracture modes.
文摘<div style="text-align:justify;"> Based on the detailed interpretation of high-accuracy 3D seismic data, the characteristics of regional unconformities, fracture systems, sedimentary filling and paleo-stress field in Zhu 1 depression were comprehensively analyzed. The results showed that 2nd episode of Zhu-Qiong movement was an important tectonic transformation that occurred during rifting, basin structure patterns above and below the regional angular unconformity caused by 2nd episode had distinct differences. The orientations of those basin-controlling faults changed from NE, NEE to EW, NWW, which indicated that the paleo-stress field veered from NNW extension clockwise to sub-NS extension and basin structures patterns transformed from NE, NEE strong rifting to sub-EW, NWW weak rifting. The depocenter showed seesaw-like migration from S to N. And the sedimentary systems transformed from semi-deep-deep lacustrine facies to braided river delta facies developed in shore-shallow lacustrine. Combined with its tectonic recombination of periphery plates that period, the mechanism of above tectonic transformation had direct correspondence to the readjustment of the Indian plate and the Pacific plate. The southward subduction of the pro-to-south China Sea is the direct cause of this tectonic transformation. </div>
文摘The modern research on basic concept inTCM deeply explored The papers in this congress are referring tothe research on Zhenghou(syndrome)theory,Five Element theory and Four Diagnosis theory by
文摘The 2nd International Conference on Rare Earth Development and Applications(ICRE’91),which wassponsored by the Chinese Society of Rare Earths,was held at Beijing International Convention Centre fromMay 27 through May 31,1991.290 scientists attended this conference,among them there were 63 foreign sci-entists.Prof.Yu Zongsen,vice-chairman of the Chinese Society of Rare Earths,presided over the openingceremony.Mr.Xu Daquan,deputy director of the Rare Earth Leading Group of the State Council,vice-minister
文摘ZTE Corporation announced on March 31, 2008 that it has been ranked second in terms of CDMA equipment competitiveness by the Yankee Group in a report entitled "ZTE Shines in CDMA Market" published by the research firm in February this year. According to the report, ZTE is the most competitive telecom vendor in China, India, emerging Asia-Pacific market, Africa and Eastern Europe. ZTE tallied the highest score in four out of seven categories the Yankee Group used to measure the CDMA competitiveness of each vendor. The seven key evaluation factors were price, technology, existing installed base, product portfolio, integration capability, government support and company culture.
文摘On October 1,co-spon- sored by the China Council for the Pro- motion of Intenational Trade(CCPIT),the All-China Women's Federation(ACWF) and the Brand China Industry Alliance(Brand China),the 2nd Chinese Brand Festival was solemnly opened at the National Indoor Stadium.Nearly 20,000 entrepreneurs,brand experts,
文摘The 2nd Chinese-Soviet Conference on Chemistry and Application Rare Earths was held at ChangchunInstitute of Applied Chemistry, Academia Sinica, and Shanghai Institute of Metallurgy, Academia Sinica,China, on October 5～11, 1991. 10 representatives from USSR attended the conference. There were 47Chinese representatives in Changchun Conference and 77 in Shanghai Conference respectively, Prof. Nijiazan, Chinese chief representative, gave a lecture entitled“Progress and Research on Rare Earth Chemistryin China”, and Prof. I.A. Smirnov gave another lecture entitled“Physico-Chemical Investigation and Per-spective of Practical Application of CeO-PrO”.
文摘In this paper,the forecasting equations of a 2nd-order space-time differential remainder are deduced from the Navier-Stokes primitive equations and Eulerian operator by Taylor-series expansion.Here we introduce a cubic spline numerical model(Spline Model for short),which is with a quasi-Lagrangian time-split integration scheme of fitting cubic spline/bicubic surface to all physical variable fields in the atmospheric equations on spherical discrete latitude-longitude mesh.A new algorithm of"fitting cubic spline—time step integration—fitting cubic spline—……"is developed to determine their first-and2nd-order derivatives and their upstream points for time discrete integral to the governing equations in Spline Model.And the cubic spline function and its mathematical polarities are also discussed to understand the Spline Model’s mathematical foundation of numerical analysis.It is pointed out that the Spline Model has mathematical laws of"convergence"of the cubic spline functions contracting to the original functions as well as its 1st-order and 2nd-order derivatives.The"optimality"of the 2nd-order derivative of the cubic spline functions is optimal approximation to that of the original functions.In addition,a Hermite bicubic patch is equivalent to operate on a grid for a 2nd-order derivative variable field.Besides,the slopes and curvatures of a central difference are identified respectively,with a smoothing coefficient of 1/3,three-point smoothing of that of a cubic spline.Then the slopes and curvatures of a central difference are calculated from the smoothing coefficient 1/3 and three-point smoothing of that of a cubic spline,respectively.Furthermore,a global simulation case of adiabatic,non-frictional and"incompressible"model atmosphere is shown with the quasi-Lagrangian time integration by using a global Spline Model,whose initial condition comes from the NCEP reanalysis data,along with quasi-uniform latitude-longitude grids and the so-called"shallow atmosphere"Navier-Stokes primitive equations in the spherical coordinates.The Spline Model,which adopted the Navier-Stokes primitive equations and quasi-Lagrangian time-split integration scheme,provides an initial ideal case of global atmospheric circulation.In addition,considering the essentially non-linear atmospheric motions,the Spline Model could judge reasonably well simple points of any smoothed variable field according to its fitting spline curvatures that must conform to its physical interpretation.
文摘In this paper a singularly perturbed linear second order hyperbolic problem with zeroth order reduced equation is discussed. Firstly, an energy inequality of the solution and an estimate of the remainder term of the asymptotic solution are given. Then an exponentially fitted difference scheme is developed in an equidistant mesh. Finally, uniform convergence in small parameter is proved in the sense of discrete energy norm.
基金Supported by Project of Dagang Branch of Petroleum Group Company Ltd,CNPC No TJDG-JZHT-2005-JSFW-0000-00339
文摘The 2nd Member of Kongdian Formation has been made up of a large number of oil shale and mudstone in the Kongnan aera of Huanghua depression around the Bohai Bay.In the Kongnan area,the lake basins were very large and deep during the deposition of the 2nd Member of Kongdian Formation.During that period,the lakes were sealed,uncommunicated with the sea water and the paleoclimate was very warm and wet in Kongnan area.Analyzing the content of the trace element and the rare earth element,carbon and oxygen isotope in the disquisition,The authors prove the two views correct.
文摘On behalf of the Organizing Committee,it is our great pleasure to invite you to the 2rid Asian Congress of Abdominal Radiology to be held in Seoul,Korea,on June 5-6,2009. The Asian Society of Abdominal Radiology (ASAR) is a non-political,non-profit society of physi- ciaus and scientists interested in Abdominal Radiology.ACAR'2009 hosted by ASAR and the ACAR' 2009 Organizing Committee will be the place to advance the study of abdominal radiology and its associated diseases by encouraging teaching,research and further education in the subspecialty,and to encourage the harmonious interchange and integration of all Asian Radiologists with an interest in this field.An- other highlight of the congress will be a technical exhibition where you can get a glimpse of radiology innovation through direct contacts with the radiology industry. E-mail:info@ acar2009.org;www.acar2009.
