A pair of up-down operators are constructed explicitly for S.C.Zhang's SO(5) theory of high Tc superconductivity.From them two good quantum numbers are derived.The up-down operators are related to the spin-indepen...A pair of up-down operators are constructed explicitly for S.C.Zhang's SO(5) theory of high Tc superconductivity.From them two good quantum numbers are derived.The up-down operators are related to the spin-independent excitons which are not considered before.展开更多
针对FIRA Middle League MiroSot(5对5)机器人足球比赛,应用软件工程方法重新编写了比赛系统软件;提高了程序的可读性和持续改进能力,并且使得原来在3对3平台上不适应5对5环境的地方得到调整和优化;另外,还增加了基于录像的识别功能,方...针对FIRA Middle League MiroSot(5对5)机器人足球比赛,应用软件工程方法重新编写了比赛系统软件;提高了程序的可读性和持续改进能力,并且使得原来在3对3平台上不适应5对5环境的地方得到调整和优化;另外,还增加了基于录像的识别功能,方便在没有硬件支持的电脑上调试视觉识别部分的程序,增加了实时仿真动画功能,节约了实时视频显示的时间;该软件在比赛中运行效果良好。展开更多
Sulfonated catalysts based on zirconia (SO3</sub>H-ZrO2</sub>), silica (SO3</sub>H-SBA-15) and zeolite (SO3</sub>H-ZSM-5) were studied in the catalytic hydrolysis reaction of hemicellulose in a...Sulfonated catalysts based on zirconia (SO3</sub>H-ZrO2</sub>), silica (SO3</sub>H-SBA-15) and zeolite (SO3</sub>H-ZSM-5) were studied in the catalytic hydrolysis reaction of hemicellulose in a microwave reactor. The prepared catalysts were characterized by various techniques (XRD, N2</sub> physisorption at 77 K, SEM, TEM and NH3</sub>-TPD). The obtained results reveal that despite the differences in their structural and textural properties, the ZrO2</sub>, Al-SBA-15 and H-ZSM-5 supports show similar conversions. Doping supports with sulfonate species created hydrogen bonds between SO3</sub>H groups and increased the amount of weak acid sites, which enhanced the hydrolysis of hemicellulose. SO3</sub>H- ZSM-5 showed the highest catalytic activity followed by SO3</sub>H-SBA-15 while SO3</sub>H-ZrO2</sub> exhibited a poor conversion. Furthermore, the catalytic hydrolysis of the hemicellulose leads to several interesting products, such as formic acid, acetic acid, lactic acid and xylan. The correlation between the catalytic performances and the acidic properties of the different samples indicates that the best catalytic performances were obtained with the least acidic solids and especially when the density of strong acid sites decreases.展开更多
In this paper,we discuss the mathematical relation determined by the basic physical constant between three types of quarks and the masses of leptons with charges in detail.First,by further theoretical analysis,we wond...In this paper,we discuss the mathematical relation determined by the basic physical constant between three types of quarks and the masses of leptons with charges in detail.First,by further theoretical analysis,we wonderfully see that the result got from the mass empirical formula of quark and charged lepton is identical with the data received by theoretical estimating from the gauge field theory.Second,we also gladly see that the result got from quark and lepton(with charges)mass empirical formula is completely accordant with experiment data.These mass formulas reveal the essential relation between me,mμ,mτ and mq.At the same time,the empirical formula may also derive the mass formula of neu-trinos.As to the mass of neutrinos,at present we only know the square difference of its mass,and so this is meaningful to theoretically estimating the mass.展开更多
In a large number of rare-earth and actinide systems,Kondo effect tends to suppress magnetic orders by making the spin singlet between localized and conduction electron spins.In the presence of orbital degrees of free...In a large number of rare-earth and actinide systems,Kondo effect tends to suppress magnetic orders by making the spin singlet between localized and conduction electron spins.In the presence of orbital degrees of freedom,however,there emerge exotic electronic orders induced by Kondo effect.The orbital Kondo effect can collectively make diagonal and off-diagonal(superconducting) orders.With the particle-hole symmetry in conduction bands,these orders are all degenerate,forming a macroscopic SO(5) multiplet.This paper discusses recent theoretical development on these electronic orders which are relevant to Pr^(3+) and U^(4+) systems with even number of f electrons per site.In the superconducting order,each conduction–electron pair is coupled with local degrees of freedom,forming a composite entity with a staggered spatial pattern.The quasi-particle spectrum is best interpreted as virtual hybridization with resonant states at the Fermi level.Possible order parameter for URu_2Si_2 in the hidden order state is discussed in the context of composite orders.Briefly discussed are related issues such as homogeneous odd-frequency pairing and SO(5) theory for hightemperature superconductors.展开更多
文摘A pair of up-down operators are constructed explicitly for S.C.Zhang's SO(5) theory of high Tc superconductivity.From them two good quantum numbers are derived.The up-down operators are related to the spin-independent excitons which are not considered before.
文摘针对FIRA Middle League MiroSot(5对5)机器人足球比赛,应用软件工程方法重新编写了比赛系统软件;提高了程序的可读性和持续改进能力,并且使得原来在3对3平台上不适应5对5环境的地方得到调整和优化;另外,还增加了基于录像的识别功能,方便在没有硬件支持的电脑上调试视觉识别部分的程序,增加了实时仿真动画功能,节约了实时视频显示的时间;该软件在比赛中运行效果良好。
文摘Sulfonated catalysts based on zirconia (SO3</sub>H-ZrO2</sub>), silica (SO3</sub>H-SBA-15) and zeolite (SO3</sub>H-ZSM-5) were studied in the catalytic hydrolysis reaction of hemicellulose in a microwave reactor. The prepared catalysts were characterized by various techniques (XRD, N2</sub> physisorption at 77 K, SEM, TEM and NH3</sub>-TPD). The obtained results reveal that despite the differences in their structural and textural properties, the ZrO2</sub>, Al-SBA-15 and H-ZSM-5 supports show similar conversions. Doping supports with sulfonate species created hydrogen bonds between SO3</sub>H groups and increased the amount of weak acid sites, which enhanced the hydrolysis of hemicellulose. SO3</sub>H- ZSM-5 showed the highest catalytic activity followed by SO3</sub>H-SBA-15 while SO3</sub>H-ZrO2</sub> exhibited a poor conversion. Furthermore, the catalytic hydrolysis of the hemicellulose leads to several interesting products, such as formic acid, acetic acid, lactic acid and xylan. The correlation between the catalytic performances and the acidic properties of the different samples indicates that the best catalytic performances were obtained with the least acidic solids and especially when the density of strong acid sites decreases.
基金the State Key Basic Research Project(973Project)of China(Grant No.2006CB605102)the National Natural Science Foundation of China(Grant No.90306016)
文摘In this paper,we discuss the mathematical relation determined by the basic physical constant between three types of quarks and the masses of leptons with charges in detail.First,by further theoretical analysis,we wonderfully see that the result got from the mass empirical formula of quark and charged lepton is identical with the data received by theoretical estimating from the gauge field theory.Second,we also gladly see that the result got from quark and lepton(with charges)mass empirical formula is completely accordant with experiment data.These mass formulas reveal the essential relation between me,mμ,mτ and mq.At the same time,the empirical formula may also derive the mass formula of neu-trinos.As to the mass of neutrinos,at present we only know the square difference of its mass,and so this is meaningful to theoretically estimating the mass.
基金supported by KAKENHI of Japan Society for the Promotion of Science (JP24340072 and JP16K05464)
文摘In a large number of rare-earth and actinide systems,Kondo effect tends to suppress magnetic orders by making the spin singlet between localized and conduction electron spins.In the presence of orbital degrees of freedom,however,there emerge exotic electronic orders induced by Kondo effect.The orbital Kondo effect can collectively make diagonal and off-diagonal(superconducting) orders.With the particle-hole symmetry in conduction bands,these orders are all degenerate,forming a macroscopic SO(5) multiplet.This paper discusses recent theoretical development on these electronic orders which are relevant to Pr^(3+) and U^(4+) systems with even number of f electrons per site.In the superconducting order,each conduction–electron pair is coupled with local degrees of freedom,forming a composite entity with a staggered spatial pattern.The quasi-particle spectrum is best interpreted as virtual hybridization with resonant states at the Fermi level.Possible order parameter for URu_2Si_2 in the hidden order state is discussed in the context of composite orders.Briefly discussed are related issues such as homogeneous odd-frequency pairing and SO(5) theory for hightemperature superconductors.
