In this paper, we investigate a method of selectively enhancing the single mode signal of a Lamb wave by using a meander-coil electromagnetic acoustic transducer （EMAT） with a new magnetic configuration. We use the ...In this paper, we investigate a method of selectively enhancing the single mode signal of a Lamb wave by using a meander-coil electromagnetic acoustic transducer （EMAT） with a new magnetic configuration. We use the Lamb antisym- metric （A0） mode and symmetric （SO） mode as an example for analysis. The analytical expression of the magnitude of the spatial Fourier transform of the Lorentz force generated by different meander coils is used to determine the optimal driving frequency for single mode generation. The numerical calculation is used to characterize the new magnetic configuration and the conventional EMAT magnet. Experimental examinations of each meander coil in combination with the conventional and new magnetic configuration show that the Lamb wave signal can be selectively enhanced by choosing the appropriate driving frequency and coil parameters through using the improved meander-coil EMAT.展开更多
Aiming at boosting the low ultraviolet (UV)re-sponsivity induced by thenegative impact of the surface 'dead layer' in silicon-based conventional photodiode (CPD), Siphotodiodes with five different structures, ...Aiming at boosting the low ultraviolet (UV)re-sponsivity induced by thenegative impact of the surface 'dead layer' in silicon-based conventional photodiode (CPD), Siphotodiodes with five different structures, including both the novel grid structurephotodiode(GSPD)and CPD, have been manufactured using thermal diffusion process and tested. The results show thatthe UV responsivity around 365 nm of GSPD could be as high as 6 times that of CPD, while the highvisible (VIS) responsivity is sharply suppressed by the employment of grid shaped junction (GSJ) inthe GSPD, which has realized the expectation of selective UV enhancement with prospect forapplication.展开更多
Mono-, di-, tri-ethanolamines and di-, tri-ethylamines were used to prepare phosphate buffer at pH 2.5 and shown to be capable of enhancing the separation selectivity of chiral drug pinacidil and melittin in bee venom...Mono-, di-, tri-ethanolamines and di-, tri-ethylamines were used to prepare phosphate buffer at pH 2.5 and shown to be capable of enhancing the separation selectivity of chiral drug pinacidil and melittin in bee venom in capillary zone electrophoresis. The reason is due to the reduction of the average apparent mobilities of the analytes.展开更多
We present an efficient method to generate an ultrashort wavelength-tunable XUV pulse by using the harmonic selec- tive enhancement scheme. The results show that by properly controlling the delay times of a two-color ...We present an efficient method to generate an ultrashort wavelength-tunable XUV pulse by using the harmonic selec- tive enhancement scheme. The results show that by properly controlling the delay times of a two-color field or a three-color field, selective enhancement of the harmonics with photon energies between 80 eV and 315 eV can be obtained. Fur- ther, a wavelength-tunable and bandwidth-controllable XUV radiation can be obtained by Fourier transformation of these enhanced harmonics.展开更多
A highly selective nitric oxide（NO） sensor is fabricated and applied to devise an enhanced flow injection analysis（FIA） system for S-nitrosothiols（RSNOs） measurement in biological samples.The NO sensor is prepar...A highly selective nitric oxide（NO） sensor is fabricated and applied to devise an enhanced flow injection analysis（FIA） system for S-nitrosothiols（RSNOs） measurement in biological samples.The NO sensor is prepared using a polytetrafluoroethylene（PTFE） gas-permeable membrane loaded with Teflon AF？ solution,a copolymer of tetrafluoroethylene and 2,2-bis（trifluoroethylene）-4,5-difluoro -l,3-dioxole,to improve selectivity.This method is much simpler and possesses good performance over a wide range of RSNOs concentrations.Standard deviation for three parallel measurements of blood plasma is 4.0%.The use of the gas sensing configuration as the detector enhances selectivity of the FIA measurement vs.using less selective electrochemical detectors that do not use PTFE/Teflon type outer membranes.展开更多
Electrocatalytic carbon dioxide(CO_(2))reduction is considered as an economical and environmentally friendly approach to neutralizing and recycling greenhouse gas CO_(2).However,the design of preeminent and robust ele...Electrocatalytic carbon dioxide(CO_(2))reduction is considered as an economical and environmentally friendly approach to neutralizing and recycling greenhouse gas CO_(2).However,the design of preeminent and robust electrocatalysts for CO_(2)electroreduction is still challenging.Herein,we report the in-situ growth of dense CuO_(x)nanowire forest on 3D porous Cu foam(CuO_(x)-NWF@Cu-F),which can be directly applied as a freestanding and binder-free working electrode for highly effective electrocatalytic CO_(2)reduction.By adjusting the surface morphology and chemical composition of CuO_(x)nanowires via surface reconstruction,large electrochemically active surface area and abundant Cu(+1)sites were generated,leading to remarkable activity for CO_(2)electroreduction.The as-prepared hierarchical conductive electrode exhibited an enhanced Faradaic efficiency of 15.0%for ethanol formation(FE_(C_(2)H_(5)OH))and a total Faradaic efficiency of 69.4%for all carbonaceous compounds(FE_(C-total))at a mild applied potential of–0.45 V vs.RHE in 0.1 M KHCO_(3)electrolyte.It achieved a 4-fold increase in FE_(C-total)than that of Cu nanowire forest supported on 3D porous Cu foam(Cu-NWF@Cu-F)obtained by in-situ reduction of the CuO_(x)-NWF@Cu-F via annealing at H_(2)atmosphere,and thereby effectively suppressed the hydrogen evolution side-reaction.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.51507171 and 51577184)
文摘In this paper, we investigate a method of selectively enhancing the single mode signal of a Lamb wave by using a meander-coil electromagnetic acoustic transducer （EMAT） with a new magnetic configuration. We use the Lamb antisym- metric （A0） mode and symmetric （SO） mode as an example for analysis. The analytical expression of the magnitude of the spatial Fourier transform of the Lorentz force generated by different meander coils is used to determine the optimal driving frequency for single mode generation. The numerical calculation is used to characterize the new magnetic configuration and the conventional EMAT magnet. Experimental examinations of each meander coil in combination with the conventional and new magnetic configuration show that the Lamb wave signal can be selectively enhanced by choosing the appropriate driving frequency and coil parameters through using the improved meander-coil EMAT.
文摘Aiming at boosting the low ultraviolet (UV)re-sponsivity induced by thenegative impact of the surface 'dead layer' in silicon-based conventional photodiode (CPD), Siphotodiodes with five different structures, including both the novel grid structurephotodiode(GSPD)and CPD, have been manufactured using thermal diffusion process and tested. The results show thatthe UV responsivity around 365 nm of GSPD could be as high as 6 times that of CPD, while the highvisible (VIS) responsivity is sharply suppressed by the employment of grid shaped junction (GSJ) inthe GSPD, which has realized the expectation of selective UV enhancement with prospect forapplication.
文摘Mono-, di-, tri-ethanolamines and di-, tri-ethylamines were used to prepare phosphate buffer at pH 2.5 and shown to be capable of enhancing the separation selectivity of chiral drug pinacidil and melittin in bee venom in capillary zone electrophoresis. The reason is due to the reduction of the average apparent mobilities of the analytes.
基金supported by the Scientific Research Fund of Liaoning Provincial Education Department,China(Grant No.L2012223)the Scientific Research Fund of Liaoning University of Technology,China(Grant Nos.X201319 and X201312)
文摘We present an efficient method to generate an ultrashort wavelength-tunable XUV pulse by using the harmonic selec- tive enhancement scheme. The results show that by properly controlling the delay times of a two-color field or a three-color field, selective enhancement of the harmonics with photon energies between 80 eV and 315 eV can be obtained. Fur- ther, a wavelength-tunable and bandwidth-controllable XUV radiation can be obtained by Fourier transformation of these enhanced harmonics.
基金the Project of Base for Introducing Talents of Discipline to Universities(111 project,NoB07012)National Scholarship Fund of the China Scholarship Council for supporting visiting students in foreign universities
文摘A highly selective nitric oxide（NO） sensor is fabricated and applied to devise an enhanced flow injection analysis（FIA） system for S-nitrosothiols（RSNOs） measurement in biological samples.The NO sensor is prepared using a polytetrafluoroethylene（PTFE） gas-permeable membrane loaded with Teflon AF？ solution,a copolymer of tetrafluoroethylene and 2,2-bis（trifluoroethylene）-4,5-difluoro -l,3-dioxole,to improve selectivity.This method is much simpler and possesses good performance over a wide range of RSNOs concentrations.Standard deviation for three parallel measurements of blood plasma is 4.0%.The use of the gas sensing configuration as the detector enhances selectivity of the FIA measurement vs.using less selective electrochemical detectors that do not use PTFE/Teflon type outer membranes.
基金grateful to the supports from the National Key R&D Program of China(No.2017YFA0208200)the National Natural Science Foundation of China(Nos.22022505,21872069)+3 种基金the Fundamental Research Funds for the Central Universities(Nos.020514380266,020514380272,020514380274)the Scientific and Technological Innovation Special Fund for Carbon Peak and Carbon Neutrality of Jiangsu Province(No.BK20220008)the Nanjing International Collaboration Research Program(Nos.202201007,2022SX00000955)the Suzhou Gusu Leading Talent Program of Science and Technology Innovation and Entrepreneurship in Wujiang District(No.ZXL2021273).
文摘Electrocatalytic carbon dioxide(CO_(2))reduction is considered as an economical and environmentally friendly approach to neutralizing and recycling greenhouse gas CO_(2).However,the design of preeminent and robust electrocatalysts for CO_(2)electroreduction is still challenging.Herein,we report the in-situ growth of dense CuO_(x)nanowire forest on 3D porous Cu foam(CuO_(x)-NWF@Cu-F),which can be directly applied as a freestanding and binder-free working electrode for highly effective electrocatalytic CO_(2)reduction.By adjusting the surface morphology and chemical composition of CuO_(x)nanowires via surface reconstruction,large electrochemically active surface area and abundant Cu(+1)sites were generated,leading to remarkable activity for CO_(2)electroreduction.The as-prepared hierarchical conductive electrode exhibited an enhanced Faradaic efficiency of 15.0%for ethanol formation(FE_(C_(2)H_(5)OH))and a total Faradaic efficiency of 69.4%for all carbonaceous compounds(FE_(C-total))at a mild applied potential of–0.45 V vs.RHE in 0.1 M KHCO_(3)electrolyte.It achieved a 4-fold increase in FE_(C-total)than that of Cu nanowire forest supported on 3D porous Cu foam(Cu-NWF@Cu-F)obtained by in-situ reduction of the CuO_(x)-NWF@Cu-F via annealing at H_(2)atmosphere,and thereby effectively suppressed the hydrogen evolution side-reaction.
