Magnetic data has been widely applied in the tectonic division.High-resolution magnetic data were used to analyze the geotectonic zoning of the South China Sea.Based on the newly compilated magnetic data,the processin...Magnetic data has been widely applied in the tectonic division.High-resolution magnetic data were used to analyze the geotectonic zoning of the South China Sea.Based on the newly compilated magnetic data,the processing results and the distribution of known faults,we consider that the U-shaped line approximately along the South China Sea national boundary of China shown in the magnetic map is a significant geological and geophysical boundary.We first described the linear characteristics of the magnetic data and then applied pseudo-gravity,Euler deconvolution,tilt derivatives,and the texture segmentation method to process the data.Results show that the dividing line between the South China Sea and the surrounding blocks is approximately along this U-shaped line.The dividing line between the South China domain and the South China Sea domain is along with the Dongsha Islands to Xisha Trough,which is different from the previous geophysical zoning results.Our results are almost consistent with those of the gravity data indicating roughly the tectonic zonation along the U-shaped line.展开更多
Shandong Province has abundant and diverse crop germplasm resources, but it is in lack of unified and effective preservation and management, leading to the decline and even extinction of many rare germplasm resources....Shandong Province has abundant and diverse crop germplasm resources, but it is in lack of unified and effective preservation and management, leading to the decline and even extinction of many rare germplasm resources. In this study, the necessity for the establishment of crop genebank in Shandong Province was briefly described. In addition, the type, functions and technical indicators, as well as the operation of the crop genebank were introduced comprehensively to provide a reference for the establishment of genebank by other units or organizations.展开更多
Cyan-emitting Ca_(9)NaGd_(2/3)(PO_(4))_(7):Eu^(2+)phosphors were synthesized via high temperature solid-state route.X-ray powder diffraction(XRD)and scanning electron microscopy(SEM)were used to verify the phase and m...Cyan-emitting Ca_(9)NaGd_(2/3)(PO_(4))_(7):Eu^(2+)phosphors were synthesized via high temperature solid-state route.X-ray powder diffraction(XRD)and scanning electron microscopy(SEM)were used to verify the phase and morphology of the Ca_(9)NaGd_(2/3)(PO_(4))_(7):Eu^(2+)(CNGP:Eu^(2+))phosphors.The as-obtained phosphor exhibits a broad excitation band of 250-420 nm,which is near the ultraviolet region.An intense asymmetric cyan emission at 496 nm corresponds to the 5 d-4 f transition of Eu^(2+).The multiplesite luminescent properties of Eu^(2+)ions in CNGP benefit from versatile structure ofβ-Ca3(PO4)2 compounds.The effective energy transfer distance is 5.46 nm(through the spectral overlap calculation),validating that the resonant energy migration type is via dipole-dipole interaction mechanism.Compared to the initial one at room temperature,the luminescent intensity of CNGP:Eu^(2+)phosphor can maintain 77%as it is heated up to 420 K.A white light-emitting diode(WLED)with excellent luminesce nt properties was successfully fabricated.Moreover,the CIE chromaticity coordinates of fabricated WLED driven by changing current just change slightly.展开更多
Eu^(2+)-doped bromophosphateapatite Sr_5(PO_4)3 Br phosphors were synthesized by the conventional hightemperature solid-state reaction.The crystal structure and luminescence properties of the phosphors,as well as thei...Eu^(2+)-doped bromophosphateapatite Sr_5(PO_4)3 Br phosphors were synthesized by the conventional hightemperature solid-state reaction.The crystal structure and luminescence properties of the phosphors,as well as their thermal stability and CIE chromaticity coordinates were systematically investigated.Photoluminescence spectra of Sr_5(PO_4)3 Br:Eu^(2+) exhibit a single blue emission at 450 nm under the excitation of 345 nm,which is ascribed to the 4 f-5 d transition of Eu^(2+).The phosphor shows very good thermal stability; The CIE color coordinates are very close to those of BaMgAl_(10)O_(17):Eu^(2+)(BAM).All the properties indicate that the blue-emitting Sr_5(PO_4)_3 Br:Eu^(2+) phosphor has potential application in white LEDs.展开更多
基金Supported by the Geological Survey Project of China(Nos.DD20191001,DD20191004,DD20189410)the National Key R&D Program of China(No.2017YFC0602000)。
文摘Magnetic data has been widely applied in the tectonic division.High-resolution magnetic data were used to analyze the geotectonic zoning of the South China Sea.Based on the newly compilated magnetic data,the processing results and the distribution of known faults,we consider that the U-shaped line approximately along the South China Sea national boundary of China shown in the magnetic map is a significant geological and geophysical boundary.We first described the linear characteristics of the magnetic data and then applied pseudo-gravity,Euler deconvolution,tilt derivatives,and the texture segmentation method to process the data.Results show that the dividing line between the South China Sea and the surrounding blocks is approximately along this U-shaped line.The dividing line between the South China domain and the South China Sea domain is along with the Dongsha Islands to Xisha Trough,which is different from the previous geophysical zoning results.Our results are almost consistent with those of the gravity data indicating roughly the tectonic zonation along the U-shaped line.
基金Supported by Key Project of the National Twelfth-Five Year Research Program of China(2013BAD01B0106)China Agriculture Research System-Green Manure(CARS-22)+4 种基金Key Science and Technology Innovation Program of Shandong Province(2017CXGC0311)Youth Foundation of Shandong Academy of Agricultural Sciences(2016YQN19)National Crop Germplasm Resources Platform of China(2012/2013-032)Modern Agricultural Industry Technology System of Shandong Province for Miscellaneous Grain Innovation Team(SDAIT-15-01)Agricultural Science and Technology Innovation Project of Shandong Academy of Agricultural Sciences(CXGC2016A02/A12)
文摘Shandong Province has abundant and diverse crop germplasm resources, but it is in lack of unified and effective preservation and management, leading to the decline and even extinction of many rare germplasm resources. In this study, the necessity for the establishment of crop genebank in Shandong Province was briefly described. In addition, the type, functions and technical indicators, as well as the operation of the crop genebank were introduced comprehensively to provide a reference for the establishment of genebank by other units or organizations.
基金Project supported by Hunan Provincial Key Laboratory of Xiangnan Rare-Precious Metals Compounds and Applications(2019XGJSKFJJ01)the Construction Program of the key discipline in Hunan Province+4 种基金the Projects of the Education Department of Hunan Province(18A465)Science and Technology Plan Project of Chenzhou City(jsyf2017014)Natural Science Foundation of Shandong Province(ZR2018LB002)Key Research and Development Project of Shandong Province(2019GGX102081)Key Research and Development Project of Jining(2019ZDGH026)。
文摘Cyan-emitting Ca_(9)NaGd_(2/3)(PO_(4))_(7):Eu^(2+)phosphors were synthesized via high temperature solid-state route.X-ray powder diffraction(XRD)and scanning electron microscopy(SEM)were used to verify the phase and morphology of the Ca_(9)NaGd_(2/3)(PO_(4))_(7):Eu^(2+)(CNGP:Eu^(2+))phosphors.The as-obtained phosphor exhibits a broad excitation band of 250-420 nm,which is near the ultraviolet region.An intense asymmetric cyan emission at 496 nm corresponds to the 5 d-4 f transition of Eu^(2+).The multiplesite luminescent properties of Eu^(2+)ions in CNGP benefit from versatile structure ofβ-Ca3(PO4)2 compounds.The effective energy transfer distance is 5.46 nm(through the spectral overlap calculation),validating that the resonant energy migration type is via dipole-dipole interaction mechanism.Compared to the initial one at room temperature,the luminescent intensity of CNGP:Eu^(2+)phosphor can maintain 77%as it is heated up to 420 K.A white light-emitting diode(WLED)with excellent luminesce nt properties was successfully fabricated.Moreover,the CIE chromaticity coordinates of fabricated WLED driven by changing current just change slightly.
基金Project supported by the Hunan Provincial Key Laboratory of Xiangnan Rare-Precious Metals Compounds and Applicationsthe Construct Program of the Key Discipline in Hunan Province for Financial Supportthe Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Science,ICT and Future Planning(2015060315)
文摘Eu^(2+)-doped bromophosphateapatite Sr_5(PO_4)3 Br phosphors were synthesized by the conventional hightemperature solid-state reaction.The crystal structure and luminescence properties of the phosphors,as well as their thermal stability and CIE chromaticity coordinates were systematically investigated.Photoluminescence spectra of Sr_5(PO_4)3 Br:Eu^(2+) exhibit a single blue emission at 450 nm under the excitation of 345 nm,which is ascribed to the 4 f-5 d transition of Eu^(2+).The phosphor shows very good thermal stability; The CIE color coordinates are very close to those of BaMgAl_(10)O_(17):Eu^(2+)(BAM).All the properties indicate that the blue-emitting Sr_5(PO_4)_3 Br:Eu^(2+) phosphor has potential application in white LEDs.
