The evolution of coordination betweenαandβphases for a two-phase titanium alloy was investigated.For this purpose,hot compression and heat treatment under different conditions were carried out.The results show that ...The evolution of coordination betweenαandβphases for a two-phase titanium alloy was investigated.For this purpose,hot compression and heat treatment under different conditions were carried out.The results show that the ability of coordinated deformation betweenαandβphases can influence uniformity of microstructure evolution.Specifically,αphase maintains the lamellar structure andβphase has a low degree of recrystallization when the ability of coordinated deformation is good.In this case,αandβphases still maintain the BOR(Burgers orientation relationship),and their interface relationship is not destroyed even at large deformation.Both of the deformation extent ofαlamellae and recrystallization degree ofβphase increase with the decline of ability of coordinated deformation.Theαphase only maintains the BOR withβphase on one side,while the uncoordinated rotation with theβphase on the other side occurs within 10°.Theαandβphases rotate asynchronously when ability of coordinated deformation is poor.The degree of interface dislocation increases,andαandβphases deviate from the BOR.展开更多
The coordination abilities are closely related to the development of technical motor skills, where the player cannot master the technical skills in the special activity, in case lack of special coordination abilities ...The coordination abilities are closely related to the development of technical motor skills, where the player cannot master the technical skills in the special activity, in case lack of special coordination abilities for this activity. Many of table tennis experts agree on that the special coordination abilities for table tennis include each of： （1） the motor adaptation and adjustment ability; （2） the ability to differentiate; （3） reaction speed ability; （4） orientation ability; （5） balance ability; （6） coupling ability; and （7） the ability to sense the rhythm. The aim of this study is to design a training program to develop the special coordination abilities of table tennis and identify the impact of this program on the general skill ability for table tennis juniors. The researcher used the experimental method in two groups： One group is experimental group and another is the control group. The most important result of this study was the training program led to the improvement of the special coordination abilities of table tennis for the experimental group, which led to higher levels of the general skill ability in table tennis for the experimental group more than the control group.展开更多
Crystals of the title compound C22H12N62HCl?H2O (DAA稨Cl) were obtained from a HCl aqueous solution of 4, 5-diazafluorene-9-one azine. The crystal belongs to monoclinic, space group P21/c with a = 5.203(3), b = 8.991(...Crystals of the title compound C22H12N62HCl?H2O (DAA稨Cl) were obtained from a HCl aqueous solution of 4, 5-diazafluorene-9-one azine. The crystal belongs to monoclinic, space group P21/c with a = 5.203(3), b = 8.991(3), c = 22.17(1) , b = 92.13(4), V = 1036.2(9) 3, Z = 2, C22H18N6O2Cl2, Mr = 468.1, Dc = 1.503 g/cm3, F(000) = 484, m(MoKa) = 0.344 mm-1, R = 0.052 and wR = 0.056 for 755 observed reflections. The Cl…N(2) distance of 2.999(6) ?and Cl…HN(2) angle of 160.8(8)o imply the existence of a stronger H-bond between Cl and DAA. And both the rather longer ClH distance of 1.814(2) ?and the unexpected shorter N(2)H distance of 1.236(6) ?suggest the protonation of DAA molecule and explain the weak coordination ability of DAA to a metal center in the acidic solution.展开更多
In this work,a diphosphine chelator,2-Ph_(2)PC_(6)H_(4)PH_(2),containing both primary and tertiary phosphine donors,was used to create highly stable silver(I)nanoclusters through a dynamic ligand metathesis reaction.T...In this work,a diphosphine chelator,2-Ph_(2)PC_(6)H_(4)PH_(2),containing both primary and tertiary phosphine donors,was used to create highly stable silver(I)nanoclusters through a dynamic ligand metathesis reaction.Taking advantage of thiolate-silver coordination polymers as synthetic precursors,we developed a viable synthetic approach to access Ag34 nanoclusters through dual proton and ligand exchange successfully.Owing to the stronger coordination ability of the bifunctional 2-Ph_(2)PC_(6)H_(4)PH_(2)ligand,substitution results in the formation of thermodynamically stable Ag34 nanoclusters linked by fifteen 2-Ph_(2)PC_(6)H_(4)P^(2-)chelators.Notably,thiolates as structural templates rather than protective ligands play a crucial role in directing nanocluster construction.The Ag34 nanoclusters manifest highly efficient near-infrared photoluminescence peaked at ca.800 nm with over 24%of quantum yield in fluid CH_(2)Cl_(2)solution,arising mostly from ligand-to-metal charge transfer(^(3)LMCT)and cluster-centered(^(3)CC)triplet states.Solution-processable near-infrared organic light-emitting diodes(NIR-OLEDs)achieved high-efficiency nearinfrared electroluminescence with an external quantum efficiency(EQE)of 10.2%.The unique synthetic approach can be extended to other metal systems,thereby expanding both the structural diversity and application potential of metal nanoclusters.展开更多
基金financial supports from the National Natural Science Foundation of China (No. 51905436)the Natural Science Foundation of Shaanxi Province, China (No. 2020JQ-156)。
文摘The evolution of coordination betweenαandβphases for a two-phase titanium alloy was investigated.For this purpose,hot compression and heat treatment under different conditions were carried out.The results show that the ability of coordinated deformation betweenαandβphases can influence uniformity of microstructure evolution.Specifically,αphase maintains the lamellar structure andβphase has a low degree of recrystallization when the ability of coordinated deformation is good.In this case,αandβphases still maintain the BOR(Burgers orientation relationship),and their interface relationship is not destroyed even at large deformation.Both of the deformation extent ofαlamellae and recrystallization degree ofβphase increase with the decline of ability of coordinated deformation.Theαphase only maintains the BOR withβphase on one side,while the uncoordinated rotation with theβphase on the other side occurs within 10°.Theαandβphases rotate asynchronously when ability of coordinated deformation is poor.The degree of interface dislocation increases,andαandβphases deviate from the BOR.
文摘The coordination abilities are closely related to the development of technical motor skills, where the player cannot master the technical skills in the special activity, in case lack of special coordination abilities for this activity. Many of table tennis experts agree on that the special coordination abilities for table tennis include each of： （1） the motor adaptation and adjustment ability; （2） the ability to differentiate; （3） reaction speed ability; （4） orientation ability; （5） balance ability; （6） coupling ability; and （7） the ability to sense the rhythm. The aim of this study is to design a training program to develop the special coordination abilities of table tennis and identify the impact of this program on the general skill ability for table tennis juniors. The researcher used the experimental method in two groups： One group is experimental group and another is the control group. The most important result of this study was the training program led to the improvement of the special coordination abilities of table tennis for the experimental group, which led to higher levels of the general skill ability in table tennis for the experimental group more than the control group.
基金The project was supported by the National Natural Science Foundation (29973036) of China
文摘Crystals of the title compound C22H12N62HCl?H2O (DAA稨Cl) were obtained from a HCl aqueous solution of 4, 5-diazafluorene-9-one azine. The crystal belongs to monoclinic, space group P21/c with a = 5.203(3), b = 8.991(3), c = 22.17(1) , b = 92.13(4), V = 1036.2(9) 3, Z = 2, C22H18N6O2Cl2, Mr = 468.1, Dc = 1.503 g/cm3, F(000) = 484, m(MoKa) = 0.344 mm-1, R = 0.052 and wR = 0.056 for 755 observed reflections. The Cl…N(2) distance of 2.999(6) ?and Cl…HN(2) angle of 160.8(8)o imply the existence of a stronger H-bond between Cl and DAA. And both the rather longer ClH distance of 1.814(2) ?and the unexpected shorter N(2)H distance of 1.236(6) ?suggest the protonation of DAA molecule and explain the weak coordination ability of DAA to a metal center in the acidic solution.
基金supported by the National Natural Science Foundation of China(Grants 92061202 and 21531008)the Fujian Province Science and Technology Project Program(Grant 2022H0041)the Self-deployment Project Research Program of Haixi Institute,Chinese Academy of Sciences(Grant CXZX-2022-GH11).
文摘In this work,a diphosphine chelator,2-Ph_(2)PC_(6)H_(4)PH_(2),containing both primary and tertiary phosphine donors,was used to create highly stable silver(I)nanoclusters through a dynamic ligand metathesis reaction.Taking advantage of thiolate-silver coordination polymers as synthetic precursors,we developed a viable synthetic approach to access Ag34 nanoclusters through dual proton and ligand exchange successfully.Owing to the stronger coordination ability of the bifunctional 2-Ph_(2)PC_(6)H_(4)PH_(2)ligand,substitution results in the formation of thermodynamically stable Ag34 nanoclusters linked by fifteen 2-Ph_(2)PC_(6)H_(4)P^(2-)chelators.Notably,thiolates as structural templates rather than protective ligands play a crucial role in directing nanocluster construction.The Ag34 nanoclusters manifest highly efficient near-infrared photoluminescence peaked at ca.800 nm with over 24%of quantum yield in fluid CH_(2)Cl_(2)solution,arising mostly from ligand-to-metal charge transfer(^(3)LMCT)and cluster-centered(^(3)CC)triplet states.Solution-processable near-infrared organic light-emitting diodes(NIR-OLEDs)achieved high-efficiency nearinfrared electroluminescence with an external quantum efficiency(EQE)of 10.2%.The unique synthetic approach can be extended to other metal systems,thereby expanding both the structural diversity and application potential of metal nanoclusters.
