The iron and steel industry in China has developed significantly since the policy of opening and reform was adopted.Especially in the period of the"Eighth Five-Year Plan",remarkable achievements have been ma...The iron and steel industry in China has developed significantly since the policy of opening and reform was adopted.Especially in the period of the"Eighth Five-Year Plan",remarkable achievements have been made in China,which makes her a big iron and steel producer in the world today.From 1980 to 1995,both consumption and展开更多
This review paper outlines recent progress in the application of rare earth metals (RE) in steel to improve the mechanical properties of steel. It includes: the physical chemistry of RE in steel; comparison of the app...This review paper outlines recent progress in the application of rare earth metals (RE) in steel to improve the mechanical properties of steel. It includes: the physical chemistry of RE in steel; comparison of the application of RE and Ca in steel; the ways of adding RE into steel and nozzle blockage; the solid solubi- lity limit of RE in Fe and the amount of RE soluble in steel; the segregation of RE on grain boundaries of steel and its reaction with other elements; the effect of RE on the structure and mechanical properties of steels; the reaction of RE with H in steel.展开更多
Based on grain boundary structural unit model, on the analogy of electric circuit calculation, it was found that the diffusion coefficients of a geneyal intervenient boundary between the delimiting boundaries 1 and 2 ...Based on grain boundary structural unit model, on the analogy of electric circuit calculation, it was found that the diffusion coefficients of a geneyal intervenient boundary between the delimiting boundaries 1 and 2 can be written as D_(11)=[D_((11)1) sin(φ_0-△θ/2)+D_((11)2)]/sinφ_0 D_⊥=D_(⊥1)D_(⊥2)sinφ_0/[sin (φ-△θ)D_(⊥2)+sin(△θ/2)D⊥1)] and D_(11)/D_⊥sin^2φ_0=D_((11)1)/D_(⊥1)sin^2(φ-△θ/2) +[(D_((11)2)/D_(⊥1))+(D_((11)1)/D_(⊥2)]sin(φ_0-△θ/2)sin(△θ/2) +(D((11)2)/D_(⊥2))sin^2(△θ/2) where D_(11) and D_⊥ are the diffusion coefficients pardllel to and perpendicular to the tilt axis, respectively. The subscripts 1 and 2 refer to the delimiting boundaries 1 and 2 respectively, and φ_0, the angle between periodic vectors of the strtictuyal units S_1 and S_2 which composes solely of delimiting boundaries 1 and 2 respectively. The experimental data from Hoffman, Upthegrove and Sinnot and Couling and Smoluchowski are analysed.展开更多
The temperature dependence of magnetization-and strain-induced magnetic anisotropy constants is reported in two nearly non-magnetostrictive CoFeSiB based metallic glasses.It is in accordance with the single-ion theory...The temperature dependence of magnetization-and strain-induced magnetic anisotropy constants is reported in two nearly non-magnetostrictive CoFeSiB based metallic glasses.It is in accordance with the single-ion theory of uniaxial magnetic anisotropy.It seems that this theory can be regarded as a basis for discussing the nature of induced magnetic anisotropy in some metallic glasses.展开更多
Initial flow stress in tension and tension plus compression and coercivity after those processes in dual-phase steels have been measured. It was found that the values of coercivity for tension plus compression are sma...Initial flow stress in tension and tension plus compression and coercivity after those processes in dual-phase steels have been measured. It was found that the values of coercivity for tension plus compression are smaller than for pure tension, a phenomenon much like the Bauschinger effect in steels.展开更多
The iron and steel industry of China has made rapid strides since we carried out the policy of reform and opening in 1978.Especially since the beginning of 1990’s,the steel output of China reached 88.68 million tons,...The iron and steel industry of China has made rapid strides since we carried out the policy of reform and opening in 1978.Especially since the beginning of 1990’s,the steel output of China reached 88.68 million tons,ranking second in the world,and it may break through 100 million tons in two or three years.Even so,the iron and steel industry in China has merely covered halfway in its development.It will keep developing in a table,rapid and healthy展开更多
The zircon Sensitive High Resolution Ion Microprobe (SHRIMP) results show that granitoid intrusions in Zhaoyc Gold Belt were emplaced at two periods of Mesozoic: Linglong and Luanjiahe types of granitic intrusions wer...The zircon Sensitive High Resolution Ion Microprobe (SHRIMP) results show that granitoid intrusions in Zhaoyc Gold Belt were emplaced at two periods of Mesozoic: Linglong and Luanjiahe types of granitic intrusions were emplaced between 160 Ma and 150 Ma (late Jurassic); Guojialing type of granodioritic intrusions, 130 Ma and 126 Ma (early Cretaceous). All the three types contain at least two major generations of inherited zircons with Precambrian ( 】650 Ma) and early Mesozoic ages (200-250 Ma), respectively. The former suggests that these plu-tonic rocks are of crustal origin and that Precambrian basement with component of sialic crust up to 3.4 Ga old ( Middle Archean) exists in the region. The presence of abundant inherited zircons with early Mesozoic age indicates that the Precambrian basement was affected by a major tectono-thermal event, that is the collision of the North and South China blocks, at 250 Ma to 200 Ma. SHRIMP results also indicate that the gold mineralization in the region took展开更多
Take the static electric field as an example. Suppose there is a two-dimensional harmonic field on complex plane Z, whose complex potential function W=U(x,y)+iV(x,y). Then the magnitude of electric field gradient
Ⅰ. INTRODUCTION The de carbon arc source is one of the fundamental sources used in analytical emission spectroscopy. Though during the past two decades many other new sources have been developed, the carbon arc sourc...Ⅰ. INTRODUCTION The de carbon arc source is one of the fundamental sources used in analytical emission spectroscopy. Though during the past two decades many other new sources have been developed, the carbon arc source, due to its simplicity, suitabitity and sensitivity, is still being commonly used in numerous fields. By using this source in the analysis展开更多
Schoenfliesite has been found at Gejiu in Yunnan Province. It occurs as a product of hydrothermally altered nordenski（?）ldine, widely scattered in a skarn belt. Synthetic MgSn（OH）6 was obtained many years ago and ...Schoenfliesite has been found at Gejiu in Yunnan Province. It occurs as a product of hydrothermally altered nordenski（?）ldine, widely scattered in a skarn belt. Synthetic MgSn（OH）6 was obtained many years ago and its crystal structure determined by H. Strunz, but its natural occurrence was found from altered residues of hulsite by C. T.展开更多
In the seventies, multiplication and division are performed in the serial-parallel arithmetical units of mini-and micro-computers by calling subroutines. The operation by this method is relatively slow. Consequently, ...In the seventies, multiplication and division are performed in the serial-parallel arithmetical units of mini-and micro-computers by calling subroutines. The operation by this method is relatively slow. Consequently, it can not be used in modern high-speed process control. For instance, the accident of broken strip occurred at the 1700mm Wide Strip Rolling Mills of展开更多
In this paper,the mathematical theory of fuzzy probability is used for theproblems of rock mass mechanics due to excavation,especially mining.A mathematicalmodel is developed for the movement and deformation of rock m...In this paper,the mathematical theory of fuzzy probability is used for theproblems of rock mass mechanics due to excavation,especially mining.A mathematicalmodel is developed for the movement and deformation of rock mass on the basis of theassumption that the displacement and deformation of rock mass is a fuzzy event,and fromthis model theoretical formulas are derived for calculating the displacement of rock massdue to excavationThe theories of both the two-and three-dimensional problems are developed and appliedto the analysis of engineering problems in excavation.The agreement of the theoreticalresults with the field measurements shows that our model is satisfactory and the formulaeobtained are valid and thus can be effectively used for predicting the displacements anddeformations and the safety evaluation of the buildings on the ground surface.展开更多
Ⅰ. INTRODUCTION In a previous work about the influence of tension and tension plus compression on flow stress and coercivity, in dual phase steels, we found that the coercivities for tension plus compression are lowe...Ⅰ. INTRODUCTION In a previous work about the influence of tension and tension plus compression on flow stress and coercivity, in dual phase steels, we found that the coercivities for tension plus compression are lower than those for pure tension, a phenomenon much like the Bauschinger effect in steels. In this work we will study the influence展开更多
The minerals calciostrontianite （CaO 8.1—10.6%） and strontianaragonite (SrCO?5.51%) have been studied by R.V. Dietrich and C. O. Hutton et al., other minerals of this series have not been reported yet.In July 1979,...The minerals calciostrontianite （CaO 8.1—10.6%） and strontianaragonite (SrCO?5.51%) have been studied by R.V. Dietrich and C. O. Hutton et al., other minerals of this series have not been reported yet.In July 1979, the authors discovered a strontium-and calcium-bearing展开更多
Nb3Ge with the highest To（23.2°K）, is widely studied as a central subject by scientists in various countries, who are searching for high To superconductors, because of its three-high and one-low fine properties...Nb3Ge with the highest To（23.2°K）, is widely studied as a central subject by scientists in various countries, who are searching for high To superconductors, because of its three-high and one-low fine properties of high Tc, high Jc, high Hc2 and low loss. Among these researches, the chemical vapor deposition method （CVD） is most widely studied, but right up to the present no report on the successful development of a prac-展开更多
Over the last ten years, in situ observation in HVEM has become an important method for studying dislocation movement. The direction along which dislocations in crystol move is always perpendicular to the dislocation ...Over the last ten years, in situ observation in HVEM has become an important method for studying dislocation movement. The direction along which dislocations in crystol move is always perpendicular to the dislocation lines. During in situ study, it was generally observed that most of disloeation images move along directions normal to the dislocation lines. But we also observed that dislocation images moved in group, and their moving direction was almost parallel to the dislocation line. The purpose of the present paper is to explain this phenomenon which is scarcely observed by trace analysis and to give the conditions for observing it.展开更多
It is well recognized that A15 Nb3Ge remains the highest Tc superconductors known at present. However, the preparation method of Nb3Ge affects the Tc’s very much; bulk samples prepared by arc-melting have a Tc of onl...It is well recognized that A15 Nb3Ge remains the highest Tc superconductors known at present. However, the preparation method of Nb3Ge affects the Tc’s very much; bulk samples prepared by arc-melting have a Tc of only 6K, while through the use of splat-cooling, Matthias et al. have been able to prepare samples having Tc’a～17K. With the thin film deposition method, it is possible to prepare high-Tc A15 Nb3Ge.展开更多
Ⅰ. INTRODUCTIONThe crystallization of Fe-B-Si amorphous ribbons has been studied in many papers. However, the structural changes of the surface in the early stage of crystallization is emphatically dealt with in the ...Ⅰ. INTRODUCTIONThe crystallization of Fe-B-Si amorphous ribbons has been studied in many papers. However, the structural changes of the surface in the early stage of crystallization is emphatically dealt with in the present note, since such changes are often significant enough to influ-展开更多
文摘The iron and steel industry in China has developed significantly since the policy of opening and reform was adopted.Especially in the period of the"Eighth Five-Year Plan",remarkable achievements have been made in China,which makes her a big iron and steel producer in the world today.From 1980 to 1995,both consumption and
文摘This review paper outlines recent progress in the application of rare earth metals (RE) in steel to improve the mechanical properties of steel. It includes: the physical chemistry of RE in steel; comparison of the application of RE and Ca in steel; the ways of adding RE into steel and nozzle blockage; the solid solubi- lity limit of RE in Fe and the amount of RE soluble in steel; the segregation of RE on grain boundaries of steel and its reaction with other elements; the effect of RE on the structure and mechanical properties of steels; the reaction of RE with H in steel.
文摘Based on grain boundary structural unit model, on the analogy of electric circuit calculation, it was found that the diffusion coefficients of a geneyal intervenient boundary between the delimiting boundaries 1 and 2 can be written as D_(11)=[D_((11)1) sin(φ_0-△θ/2)+D_((11)2)]/sinφ_0 D_⊥=D_(⊥1)D_(⊥2)sinφ_0/[sin (φ-△θ)D_(⊥2)+sin(△θ/2)D⊥1)] and D_(11)/D_⊥sin^2φ_0=D_((11)1)/D_(⊥1)sin^2(φ-△θ/2) +[(D_((11)2)/D_(⊥1))+(D_((11)1)/D_(⊥2)]sin(φ_0-△θ/2)sin(△θ/2) +(D((11)2)/D_(⊥2))sin^2(△θ/2) where D_(11) and D_⊥ are the diffusion coefficients pardllel to and perpendicular to the tilt axis, respectively. The subscripts 1 and 2 refer to the delimiting boundaries 1 and 2 respectively, and φ_0, the angle between periodic vectors of the strtictuyal units S_1 and S_2 which composes solely of delimiting boundaries 1 and 2 respectively. The experimental data from Hoffman, Upthegrove and Sinnot and Couling and Smoluchowski are analysed.
文摘The temperature dependence of magnetization-and strain-induced magnetic anisotropy constants is reported in two nearly non-magnetostrictive CoFeSiB based metallic glasses.It is in accordance with the single-ion theory of uniaxial magnetic anisotropy.It seems that this theory can be regarded as a basis for discussing the nature of induced magnetic anisotropy in some metallic glasses.
文摘Initial flow stress in tension and tension plus compression and coercivity after those processes in dual-phase steels have been measured. It was found that the values of coercivity for tension plus compression are smaller than for pure tension, a phenomenon much like the Bauschinger effect in steels.
文摘The iron and steel industry of China has made rapid strides since we carried out the policy of reform and opening in 1978.Especially since the beginning of 1990’s,the steel output of China reached 88.68 million tons,ranking second in the world,and it may break through 100 million tons in two or three years.Even so,the iron and steel industry in China has merely covered halfway in its development.It will keep developing in a table,rapid and healthy
基金Project supported by the Sino-Australian Economic and Technical Fund
文摘The zircon Sensitive High Resolution Ion Microprobe (SHRIMP) results show that granitoid intrusions in Zhaoyc Gold Belt were emplaced at two periods of Mesozoic: Linglong and Luanjiahe types of granitic intrusions were emplaced between 160 Ma and 150 Ma (late Jurassic); Guojialing type of granodioritic intrusions, 130 Ma and 126 Ma (early Cretaceous). All the three types contain at least two major generations of inherited zircons with Precambrian ( 】650 Ma) and early Mesozoic ages (200-250 Ma), respectively. The former suggests that these plu-tonic rocks are of crustal origin and that Precambrian basement with component of sialic crust up to 3.4 Ga old ( Middle Archean) exists in the region. The presence of abundant inherited zircons with early Mesozoic age indicates that the Precambrian basement was affected by a major tectono-thermal event, that is the collision of the North and South China blocks, at 250 Ma to 200 Ma. SHRIMP results also indicate that the gold mineralization in the region took
文摘Take the static electric field as an example. Suppose there is a two-dimensional harmonic field on complex plane Z, whose complex potential function W=U(x,y)+iV(x,y). Then the magnitude of electric field gradient
文摘Ⅰ. INTRODUCTION The de carbon arc source is one of the fundamental sources used in analytical emission spectroscopy. Though during the past two decades many other new sources have been developed, the carbon arc source, due to its simplicity, suitabitity and sensitivity, is still being commonly used in numerous fields. By using this source in the analysis
文摘Schoenfliesite has been found at Gejiu in Yunnan Province. It occurs as a product of hydrothermally altered nordenski（?）ldine, widely scattered in a skarn belt. Synthetic MgSn（OH）6 was obtained many years ago and its crystal structure determined by H. Strunz, but its natural occurrence was found from altered residues of hulsite by C. T.
文摘In the seventies, multiplication and division are performed in the serial-parallel arithmetical units of mini-and micro-computers by calling subroutines. The operation by this method is relatively slow. Consequently, it can not be used in modern high-speed process control. For instance, the accident of broken strip occurred at the 1700mm Wide Strip Rolling Mills of
基金A project supported by Youth Award Research Foundation of the Chinese Academy of Sciences
文摘In this paper,the mathematical theory of fuzzy probability is used for theproblems of rock mass mechanics due to excavation,especially mining.A mathematicalmodel is developed for the movement and deformation of rock mass on the basis of theassumption that the displacement and deformation of rock mass is a fuzzy event,and fromthis model theoretical formulas are derived for calculating the displacement of rock massdue to excavationThe theories of both the two-and three-dimensional problems are developed and appliedto the analysis of engineering problems in excavation.The agreement of the theoreticalresults with the field measurements shows that our model is satisfactory and the formulaeobtained are valid and thus can be effectively used for predicting the displacements anddeformations and the safety evaluation of the buildings on the ground surface.
文摘Ⅰ. INTRODUCTION In a previous work about the influence of tension and tension plus compression on flow stress and coercivity, in dual phase steels, we found that the coercivities for tension plus compression are lower than those for pure tension, a phenomenon much like the Bauschinger effect in steels. In this work we will study the influence
文摘The minerals calciostrontianite （CaO 8.1—10.6%） and strontianaragonite (SrCO?5.51%) have been studied by R.V. Dietrich and C. O. Hutton et al., other minerals of this series have not been reported yet.In July 1979, the authors discovered a strontium-and calcium-bearing
文摘Nb3Ge with the highest To（23.2°K）, is widely studied as a central subject by scientists in various countries, who are searching for high To superconductors, because of its three-high and one-low fine properties of high Tc, high Jc, high Hc2 and low loss. Among these researches, the chemical vapor deposition method （CVD） is most widely studied, but right up to the present no report on the successful development of a prac-
文摘Over the last ten years, in situ observation in HVEM has become an important method for studying dislocation movement. The direction along which dislocations in crystol move is always perpendicular to the dislocation lines. During in situ study, it was generally observed that most of disloeation images move along directions normal to the dislocation lines. But we also observed that dislocation images moved in group, and their moving direction was almost parallel to the dislocation line. The purpose of the present paper is to explain this phenomenon which is scarcely observed by trace analysis and to give the conditions for observing it.
文摘It is well recognized that A15 Nb3Ge remains the highest Tc superconductors known at present. However, the preparation method of Nb3Ge affects the Tc’s very much; bulk samples prepared by arc-melting have a Tc of only 6K, while through the use of splat-cooling, Matthias et al. have been able to prepare samples having Tc’a～17K. With the thin film deposition method, it is possible to prepare high-Tc A15 Nb3Ge.
文摘Ⅰ. INTRODUCTIONThe crystallization of Fe-B-Si amorphous ribbons has been studied in many papers. However, the structural changes of the surface in the early stage of crystallization is emphatically dealt with in the present note, since such changes are often significant enough to influ-
