Numerous dark enclaves with different shapes are found in Jiuling Neoproterozoic granitoids.Precise LAICP-MS U-Pb dating was conducted on zircons extracted from two microcrystalline enclave samples,yielding crystalliz...Numerous dark enclaves with different shapes are found in Jiuling Neoproterozoic granitoids.Precise LAICP-MS U-Pb dating was conducted on zircons extracted from two microcrystalline enclave samples,yielding crystallization ages of 822.6±5.8 Ma and 822.2±6.2 Ma,respectively.The consistent ages within analytical errors with the host granitoids suggested that they were the products of the same magmatism.The microcrystalline-dioritic enclaves commonly show plastic forms and contain similar plagioclase megacrysts to the host rocks,and both of the enclaves and host granitoids showed a complex composition and structural imbalance in plagioclases.Furthermore,the apatites with a euhedral acicular shape occurred widely in the microcrystalline-dioritic enclaves.All of these petrographic features above imply magma mixing is involved in their diagenesis.The enclaves and host granitoids show a marked zircon trace element difference and Hf isotopic signatures without correlation in zircon trace element pairs but form their own system between enclaves and host granitoids.Additionally,most of the zircons show extremely high εHf (t) with εHf (t) =3.54?11.94 from the southern samples,and εHf (t) =1.0?9.09 from the central region.Some zircons with the higher εHf (t) are similar to the zircons from the juvenile island arc in the eastern segment of Jiangnan Orogen.Integrated geological and Hf isotopic characteristics suggest microcrystalline-dioritic enclaves were derived from the partial melting process of the Mesoproterozoic crust which enriched juvenile island arc materials and mixed with the granitic magma that remelted from the Mesoproterozoic continental crust which relatively enriched ancient sediments and mixed with the host granitoid in diagenesis.展开更多
Jiuling bileaflet prosthetic heart valve is manufactured in compliance with the national standard of P.R.C. GB12279 90. This mechanical heart valve substitute is constructed entirely of solid low temperature pyrolytic...Jiuling bileaflet prosthetic heart valve is manufactured in compliance with the national standard of P.R.C. GB12279 90. This mechanical heart valve substitute is constructed entirely of solid low temperature pyrolytic carbon. There is no graphite substrate within the leaflets or orifice. This prosthesis presents with satisfactory histocompatibility and induces little hemocoagulation around it. Objective: This study aimed to assess the hydrodynamic function of the newly China made Jiuling bileaflet heart valve prostheses. Methods: Jiuling valve has been tested in a pulsatile flow simulator in the aortic position. The testing condition was set at the pulsatile frequency of 55, 75, and 100 beats/min and a constant cardiac output of 4 L/min. The mean pressure differences, leakage volumes and closing volumes across each valve, and the effective orifice areas have been analyzed. Results: The Jiuling heart valves prosthesis had the lowest pressure difference at any given tissue annulus diameter. The mean pressure difference of all the Jiuling valves decreases with increasing the tissue annulus diameter or pulse frequency, and is in the range of below 10 mmHg. CarboMedics (CarboMedics, Inc., Austin, Tex.) is similar to that of the 21 mm and 23 mm Jiuling heart valves at the given pulse rate under 4 L/min. C L tilting disc valve (Lanzhou CarboMedics Inc., China) is similar to that of the 23 mm Jiuling heart valve. The effective orifice area of the Jiuling mechanical valve increases with increasing the tissue annulus diameter or pulse frequency. CarboMedics and C L tilting disc valve is similar to that of the 21 mm and 23 mm Jiuling heart valves. The Closing volume of the Jiuling prosthetic cardiac valves increases with increasing the tissue annulus diameter, but decreases with increasing the pulse frequency, and is in the range of below 11% (normalized by stroke volume). CarboMedics is below 16.5% of stroke volume; and C L tilting disc valve is below 7.5%. The leakage volume of the Jiuling prosthetic cardiac valves increases with increasing the tissue annulus diameter, but decreases with increasing the pulse frequency, and are in the range of below 28.9% (normalized by stroke volume). The leakage volume of CarboMedics is higher than that of the same sized 25 mm Jiuling valve, and the C L tilting disc valve is also higher than that of Jiuling valve at 4 L/min. Conclusion: For a given tissue diameter, the Jiuling valve showed significantly better hemodynamic characteristics. The material used in the construction is biocompatible, durable, and thromboresistant. The design permits light weight, low profile, and high ratio of flow area to tissue annulus diameter.展开更多
Objective:To assess the hydrodynamic function of a newly China-made Jiuling bileaflet heart valve prosthesis at different simulated cardiac output.Methods:Jiuling valve,CarboMedics valve and C-L tilting disc valve hav...Objective:To assess the hydrodynamic function of a newly China-made Jiuling bileaflet heart valve prosthesis at different simulated cardiac output.Methods:Jiuling valve,CarboMedics valve and C-L tilting disc valve have been tested in the aortic position of the pulsatile flow simulator.The testing condition is set at the simulated cardiac output of 2.0,3.0,4.0,and 5.0 L/min and a constant pulsatile frequency of 75 beats/min.The mean pressure difference(ΔP),leakage volume(LEV)and closing volume(CLV)across each valve,and the effective orifice area(EOA)have been analyzed.Results:The mean ΔP of all the Jiuling valves is in the range of below 10 mmHg and decreases with increasing the tissue annulus diameter.The ΔP of 25 mm CarboMedics is about 1.5 times of the same sized Jiuling valve and 27mm C-L tilting disc valve is about 71.8% higher than the same sized Jiuling valve.The EOA of the Jiuling mechanical valves increases with increasing the given cardiac output or the tissue annulus diameter,but 25 mm CarboMedics and 27 mm C-L tilting disc valve is similar to 21 mm and 23 mm Jiuling heart valve.The CLV of the Jiuling prosthetic cardiac valve is in the range of below 11%(normalized by stroke volume),25 mm Jiuling valve is about 56.4% lower than 25 mm CarboMedics and 27 mm Jiuling valve is about 11.4% higher than 27 mm C-L tilting disc valve.The LEV of the Jiuling prosthetic cardiac valves is in the range of below 28.9% (normalized by stroke volume),25 mm Jiuling prosthetic valve is about lower 27.3% than 25 mm CarboMedics and 27 mm Jiuling valve is about lower 11.2% than 27 mm C-L tilting disc valve.Conclusion:For a given tissue diameter,the newly Jiuling heart valve prostheses show more satisfactory hemodynamic characteristics at different cardiac output.展开更多
A large number of villages are distributed on the vast land of China. In the course of urbanization in recent decades, plenty of labor, capital and materials have been migrated from rural areas to urban areas, resulti...A large number of villages are distributed on the vast land of China. In the course of urbanization in recent decades, plenty of labor, capital and materials have been migrated from rural areas to urban areas, resulting in many problems such as imbalance between urban and rural development and loss of rural vitality. To this end, a rural revitalization strategy has been proposed. Industrial revitalization is an important part of rural revitalization. The convergent development of the primary, secondary and tertiary industries is the only way to achieve industrial revitalization in rural areas in the future. With Jiuling Village, Jiaoling County, Meizhou City, Guangdong Province as the object of study, this paper expounded the necessity of the convergent development of industries, explored the path of industrial convergence of rural areas, and analyzed the supporting system behind it from three aspects of land, finance and grassroots organization construction.展开更多
文摘Numerous dark enclaves with different shapes are found in Jiuling Neoproterozoic granitoids.Precise LAICP-MS U-Pb dating was conducted on zircons extracted from two microcrystalline enclave samples,yielding crystallization ages of 822.6±5.8 Ma and 822.2±6.2 Ma,respectively.The consistent ages within analytical errors with the host granitoids suggested that they were the products of the same magmatism.The microcrystalline-dioritic enclaves commonly show plastic forms and contain similar plagioclase megacrysts to the host rocks,and both of the enclaves and host granitoids showed a complex composition and structural imbalance in plagioclases.Furthermore,the apatites with a euhedral acicular shape occurred widely in the microcrystalline-dioritic enclaves.All of these petrographic features above imply magma mixing is involved in their diagenesis.The enclaves and host granitoids show a marked zircon trace element difference and Hf isotopic signatures without correlation in zircon trace element pairs but form their own system between enclaves and host granitoids.Additionally,most of the zircons show extremely high εHf (t) with εHf (t) =3.54?11.94 from the southern samples,and εHf (t) =1.0?9.09 from the central region.Some zircons with the higher εHf (t) are similar to the zircons from the juvenile island arc in the eastern segment of Jiangnan Orogen.Integrated geological and Hf isotopic characteristics suggest microcrystalline-dioritic enclaves were derived from the partial melting process of the Mesoproterozoic crust which enriched juvenile island arc materials and mixed with the granitic magma that remelted from the Mesoproterozoic continental crust which relatively enriched ancient sediments and mixed with the host granitoid in diagenesis.
文摘Jiuling bileaflet prosthetic heart valve is manufactured in compliance with the national standard of P.R.C. GB12279 90. This mechanical heart valve substitute is constructed entirely of solid low temperature pyrolytic carbon. There is no graphite substrate within the leaflets or orifice. This prosthesis presents with satisfactory histocompatibility and induces little hemocoagulation around it. Objective: This study aimed to assess the hydrodynamic function of the newly China made Jiuling bileaflet heart valve prostheses. Methods: Jiuling valve has been tested in a pulsatile flow simulator in the aortic position. The testing condition was set at the pulsatile frequency of 55, 75, and 100 beats/min and a constant cardiac output of 4 L/min. The mean pressure differences, leakage volumes and closing volumes across each valve, and the effective orifice areas have been analyzed. Results: The Jiuling heart valves prosthesis had the lowest pressure difference at any given tissue annulus diameter. The mean pressure difference of all the Jiuling valves decreases with increasing the tissue annulus diameter or pulse frequency, and is in the range of below 10 mmHg. CarboMedics (CarboMedics, Inc., Austin, Tex.) is similar to that of the 21 mm and 23 mm Jiuling heart valves at the given pulse rate under 4 L/min. C L tilting disc valve (Lanzhou CarboMedics Inc., China) is similar to that of the 23 mm Jiuling heart valve. The effective orifice area of the Jiuling mechanical valve increases with increasing the tissue annulus diameter or pulse frequency. CarboMedics and C L tilting disc valve is similar to that of the 21 mm and 23 mm Jiuling heart valves. The Closing volume of the Jiuling prosthetic cardiac valves increases with increasing the tissue annulus diameter, but decreases with increasing the pulse frequency, and is in the range of below 11% (normalized by stroke volume). CarboMedics is below 16.5% of stroke volume; and C L tilting disc valve is below 7.5%. The leakage volume of the Jiuling prosthetic cardiac valves increases with increasing the tissue annulus diameter, but decreases with increasing the pulse frequency, and are in the range of below 28.9% (normalized by stroke volume). The leakage volume of CarboMedics is higher than that of the same sized 25 mm Jiuling valve, and the C L tilting disc valve is also higher than that of Jiuling valve at 4 L/min. Conclusion: For a given tissue diameter, the Jiuling valve showed significantly better hemodynamic characteristics. The material used in the construction is biocompatible, durable, and thromboresistant. The design permits light weight, low profile, and high ratio of flow area to tissue annulus diameter.
文摘Objective:To assess the hydrodynamic function of a newly China-made Jiuling bileaflet heart valve prosthesis at different simulated cardiac output.Methods:Jiuling valve,CarboMedics valve and C-L tilting disc valve have been tested in the aortic position of the pulsatile flow simulator.The testing condition is set at the simulated cardiac output of 2.0,3.0,4.0,and 5.0 L/min and a constant pulsatile frequency of 75 beats/min.The mean pressure difference(ΔP),leakage volume(LEV)and closing volume(CLV)across each valve,and the effective orifice area(EOA)have been analyzed.Results:The mean ΔP of all the Jiuling valves is in the range of below 10 mmHg and decreases with increasing the tissue annulus diameter.The ΔP of 25 mm CarboMedics is about 1.5 times of the same sized Jiuling valve and 27mm C-L tilting disc valve is about 71.8% higher than the same sized Jiuling valve.The EOA of the Jiuling mechanical valves increases with increasing the given cardiac output or the tissue annulus diameter,but 25 mm CarboMedics and 27 mm C-L tilting disc valve is similar to 21 mm and 23 mm Jiuling heart valve.The CLV of the Jiuling prosthetic cardiac valve is in the range of below 11%(normalized by stroke volume),25 mm Jiuling valve is about 56.4% lower than 25 mm CarboMedics and 27 mm Jiuling valve is about 11.4% higher than 27 mm C-L tilting disc valve.The LEV of the Jiuling prosthetic cardiac valves is in the range of below 28.9% (normalized by stroke volume),25 mm Jiuling prosthetic valve is about lower 27.3% than 25 mm CarboMedics and 27 mm Jiuling valve is about lower 11.2% than 27 mm C-L tilting disc valve.Conclusion:For a given tissue diameter,the newly Jiuling heart valve prostheses show more satisfactory hemodynamic characteristics at different cardiac output.
文摘A large number of villages are distributed on the vast land of China. In the course of urbanization in recent decades, plenty of labor, capital and materials have been migrated from rural areas to urban areas, resulting in many problems such as imbalance between urban and rural development and loss of rural vitality. To this end, a rural revitalization strategy has been proposed. Industrial revitalization is an important part of rural revitalization. The convergent development of the primary, secondary and tertiary industries is the only way to achieve industrial revitalization in rural areas in the future. With Jiuling Village, Jiaoling County, Meizhou City, Guangdong Province as the object of study, this paper expounded the necessity of the convergent development of industries, explored the path of industrial convergence of rural areas, and analyzed the supporting system behind it from three aspects of land, finance and grassroots organization construction.
