The continent of China is grouped into Pan-Cathaysian blocks,Laurasia and Gondwana Continental margins and relics of three oceans-Paleoasian,Tethys,and Pacific as a whole.In detail,the continent of China grew up by co...The continent of China is grouped into Pan-Cathaysian blocks,Laurasia and Gondwana Continental margins and relics of three oceans-Paleoasian,Tethys,and Pacific as a whole.In detail,the continent of China grew up by coalescence of three blocks or platforms (North China,Tarim and Yangtze)and eight orogenic belts (Altay-Inner Mongolia-Daxinganling,Tianshan-Junggar-Beishan,Qinling-Qilian- Kunlun,Qiangtang-Sanjiang,Gangdise,Himalaya,Cathaysia,Eastern Taiwan)during the processes of oceanic crust disappearance and acceretionary-collision of continental crusts.In the orogenic belts,six convergent crustal consumption zones (Ertix-Xar Moron,South Tianshan,Kuanping-Foziling,Bangong co-Shuanghu-Nujiang-Changning-Menglian,Yarlung-Tsangpo,Jiangshao-Chenzhou-Qinfang)have been distinguished.Correspondingly,the strata of the continent of China are subdivided into 17 tectonicstrata superregions,which tectonically belong to three blocks or platforms,six convergent crustal consumption zones and eight orogenic series,respectively.This division is based mainly on differences of tectonic environment and tectonic evolution among blocks,zones and belts,including the timing of when the oceanic crusts transferred into continental crusts,the paleobiogeographic features,and the types of strata.展开更多
In the present work,we investigate the structural and elastic properties of a new intermetallic hydride compound Mg 3 CuH 0.6.The theoretical study has been carried out based on density functional theory(DFT),within l...In the present work,we investigate the structural and elastic properties of a new intermetallic hydride compound Mg 3 CuH 0.6.The theoretical study has been carried out based on density functional theory(DFT),within local density approximation(LDA)and generalized gradient approximation(GGA).The calculated structural parameters of Mg 3 CuH 0.6 compound are consistent with the available experimental data in both approximations.The heat of formation found shows that this compound has a stable structure.According to Hooke’s law which leads to a linear relation between stress and strain,the elastic constants were determined.Once the elastic constants are obtained,the bulk modulus B,shear modulus G,Young’s modulus E,Poisson’s ratioσ,for Mg 3 CuH 0.6 compound were deduced using Voigt-Reuss-Hill(VRH)approximation.The results show that this alloy exhibit ductile property.Finally,the Debye temperature is also calculated and discussed for the first time.This will be considered as the first quantitative theoretical prediction of these properties.展开更多
The reaction of Co_2(CO)_8 with EtSPCl_2 gives a new crystal like compound Co_7(μ_7-S)(μ_4-PSEt)(μ- SEt)_2(μ-CO)_2(CO)_(12),whose structure has been determined by single crystal x-ray diffraction.This special com-...The reaction of Co_2(CO)_8 with EtSPCl_2 gives a new crystal like compound Co_7(μ_7-S)(μ_4-PSEt)(μ- SEt)_2(μ-CO)_2(CO)_(12),whose structure has been determined by single crystal x-ray diffraction.This special com- pound reveals some new features in cluster chemistry^1:The fragmentation of a ligand precursor EtSPCl_2 yields three kinds of fragments,μ_7-S,μ_4-PSEt and μ-SEt,which are ligands in the same cluster molecule.There is a new type of bridging S presented——A μ_7-S atom is interspaced into seven Co core.展开更多
According to the to the typical practice in some less developed regions this paperre developed regions,this paper researches the theories and methods of construction of regional development models.Inaccordancc In acc...According to the to the typical practice in some less developed regions this paperre developed regions,this paper researches the theories and methods of construction of regional development models.Inaccordancc In accordance with the of region system of man-land relationship,the auther analyses the natural evolution trends of region system as wed as the internal and the spatiai structun of region system.On the basis of theoretical study and typical example analyses,the paper presents a system of regional develoment models,including forecasting models,structure analysis and planning models,spatial-location models and strategic decision models.展开更多
基金the Foundation of the Geological Survey of China (DD20160351,121201004000 150013,121201102000150012)the National Key Research and Development Program of China (2016YFC0601005)the National Science Foundation of China (41772107).
文摘The continent of China is grouped into Pan-Cathaysian blocks,Laurasia and Gondwana Continental margins and relics of three oceans-Paleoasian,Tethys,and Pacific as a whole.In detail,the continent of China grew up by coalescence of three blocks or platforms (North China,Tarim and Yangtze)and eight orogenic belts (Altay-Inner Mongolia-Daxinganling,Tianshan-Junggar-Beishan,Qinling-Qilian- Kunlun,Qiangtang-Sanjiang,Gangdise,Himalaya,Cathaysia,Eastern Taiwan)during the processes of oceanic crust disappearance and acceretionary-collision of continental crusts.In the orogenic belts,six convergent crustal consumption zones (Ertix-Xar Moron,South Tianshan,Kuanping-Foziling,Bangong co-Shuanghu-Nujiang-Changning-Menglian,Yarlung-Tsangpo,Jiangshao-Chenzhou-Qinfang)have been distinguished.Correspondingly,the strata of the continent of China are subdivided into 17 tectonicstrata superregions,which tectonically belong to three blocks or platforms,six convergent crustal consumption zones and eight orogenic series,respectively.This division is based mainly on differences of tectonic environment and tectonic evolution among blocks,zones and belts,including the timing of when the oceanic crusts transferred into continental crusts,the paleobiogeographic features,and the types of strata.
基金This work is supported by the(ENMC)laboratory,Uni-versity Ferhat Abbas Setif-1,Algeria.
文摘In the present work,we investigate the structural and elastic properties of a new intermetallic hydride compound Mg 3 CuH 0.6.The theoretical study has been carried out based on density functional theory(DFT),within local density approximation(LDA)and generalized gradient approximation(GGA).The calculated structural parameters of Mg 3 CuH 0.6 compound are consistent with the available experimental data in both approximations.The heat of formation found shows that this compound has a stable structure.According to Hooke’s law which leads to a linear relation between stress and strain,the elastic constants were determined.Once the elastic constants are obtained,the bulk modulus B,shear modulus G,Young’s modulus E,Poisson’s ratioσ,for Mg 3 CuH 0.6 compound were deduced using Voigt-Reuss-Hill(VRH)approximation.The results show that this alloy exhibit ductile property.Finally,the Debye temperature is also calculated and discussed for the first time.This will be considered as the first quantitative theoretical prediction of these properties.
文摘The reaction of Co_2(CO)_8 with EtSPCl_2 gives a new crystal like compound Co_7(μ_7-S)(μ_4-PSEt)(μ- SEt)_2(μ-CO)_2(CO)_(12),whose structure has been determined by single crystal x-ray diffraction.This special com- pound reveals some new features in cluster chemistry^1:The fragmentation of a ligand precursor EtSPCl_2 yields three kinds of fragments,μ_7-S,μ_4-PSEt and μ-SEt,which are ligands in the same cluster molecule.There is a new type of bridging S presented——A μ_7-S atom is interspaced into seven Co core.
文摘According to the to the typical practice in some less developed regions this paperre developed regions,this paper researches the theories and methods of construction of regional development models.Inaccordancc In accordance with the of region system of man-land relationship,the auther analyses the natural evolution trends of region system as wed as the internal and the spatiai structun of region system.On the basis of theoretical study and typical example analyses,the paper presents a system of regional develoment models,including forecasting models,structure analysis and planning models,spatial-location models and strategic decision models.
