We investigate the radial symmetry of minimizers on the Pohozaev-Nehari manifold to the Schrodinger Poisson equation with a general nonlinearity f(u).Particularly,we allow that f is L^(2) supercritical.The main result...We investigate the radial symmetry of minimizers on the Pohozaev-Nehari manifold to the Schrodinger Poisson equation with a general nonlinearity f(u).Particularly,we allow that f is L^(2) supercritical.The main result shows that minimizers are radially symmetric modulo suitable translations.展开更多
In this study,a one-dimensional simulation was performed to evaluate the performance of in-cylinder combustion to control NO_(x) emissions on a four-stroke,six-cylinder marine medium-speed diesel engine.Reducing the c...In this study,a one-dimensional simulation was performed to evaluate the performance of in-cylinder combustion to control NO_(x) emissions on a four-stroke,six-cylinder marine medium-speed diesel engine.Reducing the combustion temperature is an important in-cylinder measure to decrease NO_(x) emissions of marine diesel engines.The Miller cycle is an effective method used to reduce the maximum combustion temperature in a cylinder and accordingly decrease NO_(x) emissions.Therefore,the authors of this study designed seven different early intake valve closing(EIVC)Miller cycles for the original engine,and analyzed the cycle effects on combustions and emissions in high-load conditions.The results indicate that the temperature in the cylinder was significantly reduced,whereas fuel consumption was almost unchanged.When the IVC was properly advanced,the ignition delay period increased and the premixed combustion accelerated,but the in-cylinder average pressure,temperature and NO_(x) emissions in the cylinder were lower than the original engine.However,closing the intake valve too early led to high fuel consumption.In addition,the NO_(x) emissions,in-cylinder temperature,and heat release rate remarkably increased.Therefore,the optimal timing of the EIVC varied with different loads.The higher the load was,the earlier the best advance angle appeared.Therefore,the Miller cycle is an effective method for in-engine NO_(x) purification and does not entail significant cost.展开更多
Blue phosphorescent OLEDs(Ph-OLEDs)have long faced critical challenges in efficiency,stability and brightness,which are crucial for advanced display.Herein,we introduce two novel Ir(III)emitters featuring a 3,6-di(ter...Blue phosphorescent OLEDs(Ph-OLEDs)have long faced critical challenges in efficiency,stability and brightness,which are crucial for advanced display.Herein,we introduce two novel Ir(III)emitters featuring a 3,6-di(tert-butyl)-9Hcarbazolyl(tBuCz)substituted tridentate carbene pincer ligand,significantly improving efficiency and stability.The tBuCz-m-CF3 and tBuCz-p-CF3 complexes are designed to enhance steric encumbrance and minimize exciton accumulation.These innovations lead to exceptional photoluminescence quantum yields(PLQY)of 98%and an impressive decay rate constant of 7.97×10^(5)s^(−1)in doped thin films.The Ph-OLEDs emit blue light with a peak wavelength of 485 nm and CIE coordinates of(0.175,0.446),exhibiting a peak external quantum efficiencies(EQE)of 31.62%and brightness up to 214,255 cdm^(−2).Notably,they shown minimal efficiency roll-off,retaining an EQE of 27.76%at 10,000 cdm^(−2),and 20.58%at 100,000 cdm^(−2).These consistent performances across various brightness levels represent a significant milestone for blue Ph-OLED technology.The devices also exhibit impressive stability,with an operational lifetime(LT50,the time taken for luminance to decrease by 50%)reaching 1237 h at 1000 cdm^(−2),setting new benchmarks for blue Ph-OLEDs.To enhance the color purity,hyper-OLEDs were developed with a full width at half maximum(FWHM)of 20 nm and the CIEy of 0.233,achieving an EQEm of 29.78%and LT50 of 318 h at 1000 cdm^(−2).We also fabricated the active-matrix(AM)blue Hyper-OLEDs with 400 pixels per inch to demonstrate their application in AM displays.展开更多
Comprehensive Summary Starting from an organic multiyne,three steps are normally needed for the preparation of non-βphosphonium functionalized rhodaand irida-carbolong complexes.Herein,a one-pot strategy,by mixing a ...Comprehensive Summary Starting from an organic multiyne,three steps are normally needed for the preparation of non-βphosphonium functionalized rhodaand irida-carbolong complexes.Herein,a one-pot strategy,by mixing a multiyne,a nucleophile,and Rhcl(CO)(PPh_(3))_(2)/AgBF_(4)or[Ir(CH:CN)(CO)(PPh_(3))_(2)]BF_(4),was developed to achieve a series ofβfunctionalized rhoda-and irida-carbolong complexes.Theβ-substituents in these complexes can be various C-,N-and O-centered groups,dependent on the nucleophiles used.This strategy provides a new convenient route to construct carbolong complexes,which is important for the further development of carbolong chemistry.展开更多
基金supported by the NSFC(12031015)Song's research was supported by the Shuimu Tsinghua Scholar Program,the National Funded Postdoctoral Research Program(GZB20230368)the China Postdoctoral Science Foundation(2024T170452)。
文摘We investigate the radial symmetry of minimizers on the Pohozaev-Nehari manifold to the Schrodinger Poisson equation with a general nonlinearity f(u).Particularly,we allow that f is L^(2) supercritical.The main result shows that minimizers are radially symmetric modulo suitable translations.
基金Supported by the Industry-University-Research Collaboration Project of Jiangsu Province(Grant No.BY2019048)the 19th batch of student scientific research projects of Jiangsu University(19A306)。
文摘In this study,a one-dimensional simulation was performed to evaluate the performance of in-cylinder combustion to control NO_(x) emissions on a four-stroke,six-cylinder marine medium-speed diesel engine.Reducing the combustion temperature is an important in-cylinder measure to decrease NO_(x) emissions of marine diesel engines.The Miller cycle is an effective method used to reduce the maximum combustion temperature in a cylinder and accordingly decrease NO_(x) emissions.Therefore,the authors of this study designed seven different early intake valve closing(EIVC)Miller cycles for the original engine,and analyzed the cycle effects on combustions and emissions in high-load conditions.The results indicate that the temperature in the cylinder was significantly reduced,whereas fuel consumption was almost unchanged.When the IVC was properly advanced,the ignition delay period increased and the premixed combustion accelerated,but the in-cylinder average pressure,temperature and NO_(x) emissions in the cylinder were lower than the original engine.However,closing the intake valve too early led to high fuel consumption.In addition,the NO_(x) emissions,in-cylinder temperature,and heat release rate remarkably increased.Therefore,the optimal timing of the EIVC varied with different loads.The higher the load was,the earlier the best advance angle appeared.Therefore,the Miller cycle is an effective method for in-engine NO_(x) purification and does not entail significant cost.
基金the National Natural Science Foundation of China(grant no.:52027817)Shenzhen Science and Technology Innovation Commission(grant no.:GJHZ20210705143204013)+1 种基金Research Grant Council of Hong Kong(grant no.:CityU 11312722)lShenzhen Science and Technology Innovation Commission(grant no.:JCYJ20200109144614514)China Postdoctoral Science Foundation(grant no:2024M761639).
文摘Blue phosphorescent OLEDs(Ph-OLEDs)have long faced critical challenges in efficiency,stability and brightness,which are crucial for advanced display.Herein,we introduce two novel Ir(III)emitters featuring a 3,6-di(tert-butyl)-9Hcarbazolyl(tBuCz)substituted tridentate carbene pincer ligand,significantly improving efficiency and stability.The tBuCz-m-CF3 and tBuCz-p-CF3 complexes are designed to enhance steric encumbrance and minimize exciton accumulation.These innovations lead to exceptional photoluminescence quantum yields(PLQY)of 98%and an impressive decay rate constant of 7.97×10^(5)s^(−1)in doped thin films.The Ph-OLEDs emit blue light with a peak wavelength of 485 nm and CIE coordinates of(0.175,0.446),exhibiting a peak external quantum efficiencies(EQE)of 31.62%and brightness up to 214,255 cdm^(−2).Notably,they shown minimal efficiency roll-off,retaining an EQE of 27.76%at 10,000 cdm^(−2),and 20.58%at 100,000 cdm^(−2).These consistent performances across various brightness levels represent a significant milestone for blue Ph-OLED technology.The devices also exhibit impressive stability,with an operational lifetime(LT50,the time taken for luminance to decrease by 50%)reaching 1237 h at 1000 cdm^(−2),setting new benchmarks for blue Ph-OLEDs.To enhance the color purity,hyper-OLEDs were developed with a full width at half maximum(FWHM)of 20 nm and the CIEy of 0.233,achieving an EQEm of 29.78%and LT50 of 318 h at 1000 cdm^(−2).We also fabricated the active-matrix(AM)blue Hyper-OLEDs with 400 pixels per inch to demonstrate their application in AM displays.
基金We gratefully acknowledge the NSFC(Nos.22071098,21871068,22101123 and 22101115)the Guangdong Provincial Key Laboratory of Catalysis(No.2020B121201002)the Shenzhen Science and Technology Innovation Committee(Nos.JCYJ20200109140812302 and JCYJ20210324105013035),for their financial support.
文摘Comprehensive Summary Starting from an organic multiyne,three steps are normally needed for the preparation of non-βphosphonium functionalized rhodaand irida-carbolong complexes.Herein,a one-pot strategy,by mixing a multiyne,a nucleophile,and Rhcl(CO)(PPh_(3))_(2)/AgBF_(4)or[Ir(CH:CN)(CO)(PPh_(3))_(2)]BF_(4),was developed to achieve a series ofβfunctionalized rhoda-and irida-carbolong complexes.Theβ-substituents in these complexes can be various C-,N-and O-centered groups,dependent on the nucleophiles used.This strategy provides a new convenient route to construct carbolong complexes,which is important for the further development of carbolong chemistry.
