The utilization of arsenic-containing gold dressing tailings is an urgent issue faced by gold production companies worldwide.The thermodynamic analysis results indicate that ferrous arsenate(FeAsO_(4)),pyrite(FeS_(2))...The utilization of arsenic-containing gold dressing tailings is an urgent issue faced by gold production companies worldwide.The thermodynamic analysis results indicate that ferrous arsenate(FeAsO_(4)),pyrite(FeS_(2))and sodium cyanide(NaCN)in the arsenic-containing gold metallurgical tailings can be effectively removed using straight grate process,and the removal of pyrite and sodium cyanide is basically completed during the preheating stage,while the removal of ferrous arsenate requires the roasting stage.The pellets undergo a transformation from magnetite to hematite during the preheating process,and are solidified through micro-crystalline bonding and high-temperature recrystallization of hematite(Fe_(2)O_(3))during the roasting process.Ultimately,pellets with removal rates of 80.77% for arsenic,88.78% for sulfur,and 99.88% for cyanide are obtained,as well as the iron content is 61.1% and the compressive strength is 3071 N,meeting the requirements for blast furnace burden.This study provides an industrially feasible method for treating arsenic-containing gold smelting tailings,benefiting gold production enterprises.展开更多
A novel complementary grating structure is proposed for plasmonic refractive index sensing due to its strong resonance at near-infrared wavelength.The reflection spectra and the electric field distributions are obtain...A novel complementary grating structure is proposed for plasmonic refractive index sensing due to its strong resonance at near-infrared wavelength.The reflection spectra and the electric field distributions are obtained via the finite-difference time-domain method.Numerical simulation results show that multiple surface plasmon resonance modes can be excited in this novel structure.Subsequently,one of the resonance modes shows appreciable potential in refractive index sensing due to its wide range of action with the environment of the analyte.After optimizing the grating geometric variables of the structure,the designed structure shows the stable sensing performance with a high refractive index sensitivity of 1642 nm per refractive index unit(nm/RIU)and the figure of merit of 409 RIU^(-1).The promising simulation results indicate that such a sensor has a broad application prospect in biochemistry.展开更多
Filling high-aspect-ratio trenches with gold is a frequent requirement in the fabrication of X-ray optics as well as micro-electronic components and other fabrication processes. Conformal electrodeposition of gold in ...Filling high-aspect-ratio trenches with gold is a frequent requirement in the fabrication of X-ray optics as well as micro-electronic components and other fabrication processes. Conformal electrodeposition of gold in sub-micron-width silicon trenches with an aspect ratio greater than 35 over a grating area of several square centimeters is challenging and has not been described in the literature previously. A comparison of pulsed plating and constant current plating led to a gold electroplating protocol that reliably filled trenches for such structures.展开更多
A numerical simulation study of the performance of encoding and decoding of short optical pulse in OCDMA (Optical Code Division Multiple Access) systems under non-linear optical effects is presented. The performance o...A numerical simulation study of the performance of encoding and decoding of short optical pulse in OCDMA (Optical Code Division Multiple Access) systems under non-linear optical effects is presented. The performance of encoding and decoding short pulses is obtained through use of device FBG (fiber Bragg grating) where the codes are inserted through discrete jumps in the optical phase (±π). The multiuser interference is also the object of the present study, where a figure of merit (interference figure) is used to quantify the interference in multiuser auto and cross correlation. We evaluate the dependence of the multiuser interference for the coupling constant of FBG. Finally, the interference inserted in the autocorrelation due to nonlinear effects generated in the nonlinear switching of the coded pulse in a dual core nonlinear directional coupler is examined, where temporal broadening of pulses decoded is observed.展开更多
Assembling and ordering nanomaterials into desirable patterns are considerably significant,since the properties of nanomaterials depend not only on the size and shape,but also on the spatial arrangement among the coll...Assembling and ordering nanomaterials into desirable patterns are considerably significant,since the properties of nanomaterials depend not only on the size and shape,but also on the spatial arrangement among the collective building blocks.In this work,the DNA self-assembly technology of hybridization chain reaction(HCR) provided a convenient method to yield long double-strand DNA(dsDNA) to install gold nanoparticles(AuNPs) into one dimensional assembly along the skeleton of dsDNA.Interestingly,the tunable length of AuNPs assemblies along dsDNA chain could be achieved by adjusting the reaction time of HCR,which is based on the formation of covalent bond between Au and the-SH group of DNA.Compared with weak light scattering of single AuNP,these AuNPs assemblies could be clearly imaged under the dark field microscopy,indicating that the light scattering was greatly improved after assembling.展开更多
We demonstrate a fiber refractive index（RI） sensor based on an excessively tilted fiber grating（ExTFG）immobilized by large-size plasmonic gold nanoshells（GNSs）. The GNSs are covalently linked on ExTFG surface.Ex...We demonstrate a fiber refractive index（RI） sensor based on an excessively tilted fiber grating（ExTFG）immobilized by large-size plasmonic gold nanoshells（GNSs）. The GNSs are covalently linked on ExTFG surface.Experimental results demonstrate that both the intensity of the transverse magnetic（TM） and transverse electric（TE） modes of ExTFG are significantly modulated by the localized surface plasmon resonance（LSPR） of GNSs due to the wide-range absorption band. The wavelength RI sensitivities of the TM and TE modes in the low RI range of 1.333–1.379 are improved by ～25% and ～14% after GNSs immobilization, respectively, and the intensity RI sensitivities are ～599%/RIU and ～486%/RIU, respectively.展开更多
Two small-size package methods, thin stainless steel tube based package method and plating gold based package method for fiber Bragg grating(FBG) temperature sensors, are designed. The characteristics of the FBG tempe...Two small-size package methods, thin stainless steel tube based package method and plating gold based package method for fiber Bragg grating(FBG) temperature sensors, are designed. The characteristics of the FBG temperature sensors in the environment temperature between 203K and 243K are investigated. The wavelengths of the FBG temperature sensors as a function of the temperature are examined experimentally. The experiment results of the two different small-size package sensors in identical conditions are compared with each other. The transmission spectrum of the sensors is analyzed at the temperature of 273K and 213K. The temperature sensitive factors of the sensors are derived analytically and are verified by experiments. Linear fitting to the wavelength-temperature curve is carried out.展开更多
基金Project(52274343)supported by the National Natural Science Foundation of ChinaProjects(2023YFC3903900,2023YFC3903904)supported by the National Key R&D Program of China。
文摘The utilization of arsenic-containing gold dressing tailings is an urgent issue faced by gold production companies worldwide.The thermodynamic analysis results indicate that ferrous arsenate(FeAsO_(4)),pyrite(FeS_(2))and sodium cyanide(NaCN)in the arsenic-containing gold metallurgical tailings can be effectively removed using straight grate process,and the removal of pyrite and sodium cyanide is basically completed during the preheating stage,while the removal of ferrous arsenate requires the roasting stage.The pellets undergo a transformation from magnetite to hematite during the preheating process,and are solidified through micro-crystalline bonding and high-temperature recrystallization of hematite(Fe_(2)O_(3))during the roasting process.Ultimately,pellets with removal rates of 80.77% for arsenic,88.78% for sulfur,and 99.88% for cyanide are obtained,as well as the iron content is 61.1% and the compressive strength is 3071 N,meeting the requirements for blast furnace burden.This study provides an industrially feasible method for treating arsenic-containing gold smelting tailings,benefiting gold production enterprises.
基金Project supported by the National Natural Science Foundation of China(Grant No.61865008)the Scientific Research Fund of Sichuan Provincial Science and Technology Department,China(Grant No.2020YJ0137)。
文摘A novel complementary grating structure is proposed for plasmonic refractive index sensing due to its strong resonance at near-infrared wavelength.The reflection spectra and the electric field distributions are obtained via the finite-difference time-domain method.Numerical simulation results show that multiple surface plasmon resonance modes can be excited in this novel structure.Subsequently,one of the resonance modes shows appreciable potential in refractive index sensing due to its wide range of action with the environment of the analyte.After optimizing the grating geometric variables of the structure,the designed structure shows the stable sensing performance with a high refractive index sensitivity of 1642 nm per refractive index unit(nm/RIU)and the figure of merit of 409 RIU^(-1).The promising simulation results indicate that such a sensor has a broad application prospect in biochemistry.
文摘Filling high-aspect-ratio trenches with gold is a frequent requirement in the fabrication of X-ray optics as well as micro-electronic components and other fabrication processes. Conformal electrodeposition of gold in sub-micron-width silicon trenches with an aspect ratio greater than 35 over a grating area of several square centimeters is challenging and has not been described in the literature previously. A comparison of pulsed plating and constant current plating led to a gold electroplating protocol that reliably filled trenches for such structures.
基金CNPq,FUNCAP,CAPES,FINEP for the financial support.
文摘A numerical simulation study of the performance of encoding and decoding of short optical pulse in OCDMA (Optical Code Division Multiple Access) systems under non-linear optical effects is presented. The performance of encoding and decoding short pulses is obtained through use of device FBG (fiber Bragg grating) where the codes are inserted through discrete jumps in the optical phase (±π). The multiuser interference is also the object of the present study, where a figure of merit (interference figure) is used to quantify the interference in multiuser auto and cross correlation. We evaluate the dependence of the multiuser interference for the coupling constant of FBG. Finally, the interference inserted in the autocorrelation due to nonlinear effects generated in the nonlinear switching of the coded pulse in a dual core nonlinear directional coupler is examined, where temporal broadening of pulses decoded is observed.
基金supported by the National Natural Science Foundation of China(21535006,21405123)
文摘Assembling and ordering nanomaterials into desirable patterns are considerably significant,since the properties of nanomaterials depend not only on the size and shape,but also on the spatial arrangement among the collective building blocks.In this work,the DNA self-assembly technology of hybridization chain reaction(HCR) provided a convenient method to yield long double-strand DNA(dsDNA) to install gold nanoparticles(AuNPs) into one dimensional assembly along the skeleton of dsDNA.Interestingly,the tunable length of AuNPs assemblies along dsDNA chain could be achieved by adjusting the reaction time of HCR,which is based on the formation of covalent bond between Au and the-SH group of DNA.Compared with weak light scattering of single AuNP,these AuNPs assemblies could be clearly imaged under the dark field microscopy,indicating that the light scattering was greatly improved after assembling.
基金supported by the National Natural Science Foundation of China(Nos.61875026 and 61505017)the Foundation and Cutting-Edge Research Projects of the Chongqing Science and Technology Commission(No.cstc2018jcyjAX0122)the Graduate Student Innovation Program of the Chongqing University of Technology(No.ycx2018238)
文摘We demonstrate a fiber refractive index（RI） sensor based on an excessively tilted fiber grating（ExTFG）immobilized by large-size plasmonic gold nanoshells（GNSs）. The GNSs are covalently linked on ExTFG surface.Experimental results demonstrate that both the intensity of the transverse magnetic（TM） and transverse electric（TE） modes of ExTFG are significantly modulated by the localized surface plasmon resonance（LSPR） of GNSs due to the wide-range absorption band. The wavelength RI sensitivities of the TM and TE modes in the low RI range of 1.333–1.379 are improved by ～25% and ～14% after GNSs immobilization, respectively, and the intensity RI sensitivities are ～599%/RIU and ～486%/RIU, respectively.
基金National Natural Science Foundation of China(50179029)
文摘Two small-size package methods, thin stainless steel tube based package method and plating gold based package method for fiber Bragg grating(FBG) temperature sensors, are designed. The characteristics of the FBG temperature sensors in the environment temperature between 203K and 243K are investigated. The wavelengths of the FBG temperature sensors as a function of the temperature are examined experimentally. The experiment results of the two different small-size package sensors in identical conditions are compared with each other. The transmission spectrum of the sensors is analyzed at the temperature of 273K and 213K. The temperature sensitive factors of the sensors are derived analytically and are verified by experiments. Linear fitting to the wavelength-temperature curve is carried out.
