Dielectric ceramic capacitors,with the advantages of high power density,fast chargedischarge capability,excellent fatigue endurance,and good high temperature stability,have been acknowledged to be promising candidates...Dielectric ceramic capacitors,with the advantages of high power density,fast chargedischarge capability,excellent fatigue endurance,and good high temperature stability,have been acknowledged to be promising candidates for solid-state pulse power systems.This review investigates the energy storage performances of linear dielectric,relaxor ferroelectric,and antiferroelectric from the viewpoint of chemical modification,macro/microstructural design,and electrical property optimization.Research progress of ceramic bulks and films for Pb-based and/or Pb-free systems is summarized.Finally,we propose the perspectives on the development of energy storage ceramics for pulse power capacitors in the future.展开更多
(Ba0.3Sr0.7)x(Bi0.5Na0.5)1-xTiO3(BSxBNT,x=0.3–V0.8)ceramics were prepared to investigate their structure,dielectric and ferroelectric properties.BSxBNT ceramics possess pure perovskite structure accompanied from a te...(Ba0.3Sr0.7)x(Bi0.5Na0.5)1-xTiO3(BSxBNT,x=0.3–V0.8)ceramics were prepared to investigate their structure,dielectric and ferroelectric properties.BSxBNT ceramics possess pure perovskite structure accompanied from a tetragonal symmetry to pseudo-cubic one with the increase of x value,being confirmed by X-ray diffraction(XRD)and Raman results.The Tm corresponding to a temperature in the vicinity of maximum dielectric constant gradually decreases from 110℃(x=0.3)to-45℃(x=0.8),across Tm=36℃(x=0.5)with a maximum dielectric constant(ɛr=5920@1 kHz)around room temperature.The saturated polarization Ps gradually while the remnant polarization Pr sharply decreases with the increase of x value,making the P-E hysteresis loop of BSxBNT ceramics goes slim.A maximum difference between Ps and Pr(Ps-Pr)is obtained for BSxBNT ceramics with x=0.5,at which a high recoverable energy density(Wrec=1.04 J/cm3)is achieved under an applied electric field of 100 kV/cm with an efficiency ofη=77%.Meanwhile,the varied temperature P-E loops,fatigue measurements,and electric breakdown characteristics for the sample with x=0.5 indicate that it is promising for pulsed power energy storage capacitor candidate materials.展开更多
To acquire the developing trend and ways of mechanization of tea plucking, with analyzing the developing backgrounds and situations of tea plucking machine both at home and abroad, this paper obtains the conclusion th...To acquire the developing trend and ways of mechanization of tea plucking, with analyzing the developing backgrounds and situations of tea plucking machine both at home and abroad, this paper obtains the conclusion that there are several countries that have conducted a lot of studies on tea plucking machine, such as Japan, England, France, India, Australia and Argentina. Among others, Japan goes ahead, where lots of researches have been conducted in the highest developing level. The article also analyses the reason why China has a poor mechanization of tea plucking and points out existing problems. Finally, some advices and measures for developing Chinese domestic mechanization of tea plucking are given.展开更多
Nickel-rich cathode is considered to be the cathode material that can solve the short-range problem of electric vehicles with excellent elec-trochemical properties and low price.However,microcracks,lithium–nickel hyb...Nickel-rich cathode is considered to be the cathode material that can solve the short-range problem of electric vehicles with excellent elec-trochemical properties and low price.However,microcracks,lithium–nickel hybridization,and irreversible phase transitions during cycling limit their commercial applications.These issues should be resolved by modifications.In recent years,it has been favored by researchers to solve a large number of problems by combining multiple modification strate-gies.Therefore,this paper reviews recent developments in various modification techniques for nickel-rich cathode materials that have improved their electrochemical characteristics.The summary of multiple modifications of nickel-rich materials will play a guiding role in future development.展开更多
The application of photothermal therapy(PTT)is greatly limited by the low accumulation of photothermal agents,uneven photothermal distribution,and heat endurance of cancer cells.Worse still,despite PTT enhances immuno...The application of photothermal therapy(PTT)is greatly limited by the low accumulation of photothermal agents,uneven photothermal distribution,and heat endurance of cancer cells.Worse still,despite PTT enhances immunogenicity,the anti-tumor immune efficacy is still unsatisfactory due to the inefficient immunogenic cell death(ICD)induction and poor infiltration of immune cells.To solve the above problems of PTT,we developed hyaluronic acid(HA)modified hollow copper sulfide nanoparticles encapsulating diethyldithiocarbamate(DDTC)to construct a breast tumor targeting and near infrared(NIR)photo-responsive drug delivery system(D-HCuS@HA),which further combined with losartan to improve the accumulation and penetration in the tumor site.Upon irradiation,D-HCuS@HA realized enhanced PTT and released cytotoxic Cu(DDTC)_(2)to eliminate heat endurance tumor cells,thereby enhancing antitumor effect and inducing effective ICD.Moreover,the combination with losartan could remodel the tumor microenvironment,allowing more T cells to infiltrate into the tumor,and significantly inhibiting the occurrence and development of metastatic tumors.In vitro/vivo results revealed the great potential of D-HCuS@HA combined with losartan,which provides a new paradigm for anti-tumor and anti-metastases.展开更多
[Objectives]This study was conducted to find out the causes of abnormal antler shedding in Père David s deer(Elaphurus davidianus).[Methods]Abnormally-shed antlers were compared with normally-shed antlers in term...[Objectives]This study was conducted to find out the causes of abnormal antler shedding in Père David s deer(Elaphurus davidianus).[Methods]Abnormally-shed antlers were compared with normally-shed antlers in terms of light condition,antler development and bone nutritional status during the abnormal shedding season in the growth area of Père David s deer.[Results]Abnormally-shed antlers had no significant differences in the development of shed antlers,or even in the overall composition of antlers,from those of normal Père David s deer.[Conclusions]Insufficient light was the main cause of abnormal antler shedding in Père David s deer.展开更多
As agricultural labor is decreasing,famous tea production is nearly hard to sustain and is getting more and more expensive in China.To improve the mechanization of tea plucking,this paper designs a self-propelled trac...As agricultural labor is decreasing,famous tea production is nearly hard to sustain and is getting more and more expensive in China.To improve the mechanization of tea plucking,this paper designs a self-propelled track-type tea plucking machine that integrates mechanic,hydraulic and electronics.The main parameters of chassis were optimized based on conditions of tea garden.And,three different kinds of cutter blades were designed and analyzed about vibration performance with finite element software.Also,a rigid-flex mixed motion model was established.Based on the model and plots,it is explicit that:(1)the blades move in a sine law;(2)the blades take a symmetrical deform from middle to end while moving;(3)the deformation increases along the blade from the center to sides.The single factor experiment revealed that both travel speed and speed ratio of cutting and travelling had a significant effect on quality indexes(integrity rate,unpicking rate,stubble unevenness)of plucked tea leaf.By universal rotary combination experiment of quadratic regression,the regression equations of three indexes about two experimental factors were established.And,the comprehensive optimization of three indexes was conducted with software Design expert.The optimal operating parameters of machine are as follow:travel speed is 0.41 m/s,speed ratio of cutting and travelling is 1.06;prediction of three indexes are that integrity rate could be reach to 78.26%,unpicking rate reduced to 0.82%,stubble unevenness reduced to 1.30 mm.The results of verification experiment are that:integrity rate could be reach to 77.41%,unpicking rate reduced to 0.87%,stubble unevenness reduced to 1.23 mm.These test indexes that are very close to the predicted values,all surpass the requests specified in the standard of tea plucking with machine.In all,the optimized parameter set is indeed synthetically optimal one that enables the wide use of this tea plucking machine,which can be used in the tea garden that has a lengthways slope less than 18°,a crosswise slope l展开更多
基金supported by the National Natural Science Foundation of China(51767010).
文摘Dielectric ceramic capacitors,with the advantages of high power density,fast chargedischarge capability,excellent fatigue endurance,and good high temperature stability,have been acknowledged to be promising candidates for solid-state pulse power systems.This review investigates the energy storage performances of linear dielectric,relaxor ferroelectric,and antiferroelectric from the viewpoint of chemical modification,macro/microstructural design,and electrical property optimization.Research progress of ceramic bulks and films for Pb-based and/or Pb-free systems is summarized.Finally,we propose the perspectives on the development of energy storage ceramics for pulse power capacitors in the future.
基金This work was financially supported by National Natural Science Foundation of China(51767010)Science&Technology Key Research Project of Jiangxi Provincial Education Department(GJJ170760)Graduate Student Innovation Fund of Jiangxi Province(YC2018-S295).
文摘(Ba0.3Sr0.7)x(Bi0.5Na0.5)1-xTiO3(BSxBNT,x=0.3–V0.8)ceramics were prepared to investigate their structure,dielectric and ferroelectric properties.BSxBNT ceramics possess pure perovskite structure accompanied from a tetragonal symmetry to pseudo-cubic one with the increase of x value,being confirmed by X-ray diffraction(XRD)and Raman results.The Tm corresponding to a temperature in the vicinity of maximum dielectric constant gradually decreases from 110℃(x=0.3)to-45℃(x=0.8),across Tm=36℃(x=0.5)with a maximum dielectric constant(ɛr=5920@1 kHz)around room temperature.The saturated polarization Ps gradually while the remnant polarization Pr sharply decreases with the increase of x value,making the P-E hysteresis loop of BSxBNT ceramics goes slim.A maximum difference between Ps and Pr(Ps-Pr)is obtained for BSxBNT ceramics with x=0.5,at which a high recoverable energy density(Wrec=1.04 J/cm3)is achieved under an applied electric field of 100 kV/cm with an efficiency ofη=77%.Meanwhile,the varied temperature P-E loops,fatigue measurements,and electric breakdown characteristics for the sample with x=0.5 indicate that it is promising for pulsed power energy storage capacitor candidate materials.
文摘To acquire the developing trend and ways of mechanization of tea plucking, with analyzing the developing backgrounds and situations of tea plucking machine both at home and abroad, this paper obtains the conclusion that there are several countries that have conducted a lot of studies on tea plucking machine, such as Japan, England, France, India, Australia and Argentina. Among others, Japan goes ahead, where lots of researches have been conducted in the highest developing level. The article also analyses the reason why China has a poor mechanization of tea plucking and points out existing problems. Finally, some advices and measures for developing Chinese domestic mechanization of tea plucking are given.
基金supported by the project from the National Natural Science Foundation of China (20A20145)the Sichuan Science and Technology Program (No.2022ZHCG0121,No.21ZHSF0111)the start-up funding of the Chemistry and Chemical Engineering Guangdong Laboratory (No.2122010).
文摘Nickel-rich cathode is considered to be the cathode material that can solve the short-range problem of electric vehicles with excellent elec-trochemical properties and low price.However,microcracks,lithium–nickel hybridization,and irreversible phase transitions during cycling limit their commercial applications.These issues should be resolved by modifications.In recent years,it has been favored by researchers to solve a large number of problems by combining multiple modification strate-gies.Therefore,this paper reviews recent developments in various modification techniques for nickel-rich cathode materials that have improved their electrochemical characteristics.The summary of multiple modifications of nickel-rich materials will play a guiding role in future development.
基金supported by National Natural Science Foundation of China(No.82173762)Research Funds of Sichuan Science and Technology Department(Nos.2022JDJQ0050,2022YFS0334)111 Project(No.B18035)。
文摘The application of photothermal therapy(PTT)is greatly limited by the low accumulation of photothermal agents,uneven photothermal distribution,and heat endurance of cancer cells.Worse still,despite PTT enhances immunogenicity,the anti-tumor immune efficacy is still unsatisfactory due to the inefficient immunogenic cell death(ICD)induction and poor infiltration of immune cells.To solve the above problems of PTT,we developed hyaluronic acid(HA)modified hollow copper sulfide nanoparticles encapsulating diethyldithiocarbamate(DDTC)to construct a breast tumor targeting and near infrared(NIR)photo-responsive drug delivery system(D-HCuS@HA),which further combined with losartan to improve the accumulation and penetration in the tumor site.Upon irradiation,D-HCuS@HA realized enhanced PTT and released cytotoxic Cu(DDTC)_(2)to eliminate heat endurance tumor cells,thereby enhancing antitumor effect and inducing effective ICD.Moreover,the combination with losartan could remodel the tumor microenvironment,allowing more T cells to infiltrate into the tumor,and significantly inhibiting the occurrence and development of metastatic tumors.In vitro/vivo results revealed the great potential of D-HCuS@HA combined with losartan,which provides a new paradigm for anti-tumor and anti-metastases.
基金Supported by Science and Technology Research Project of Hubei Provincial Department of Education (B2018522).
文摘[Objectives]This study was conducted to find out the causes of abnormal antler shedding in Père David s deer(Elaphurus davidianus).[Methods]Abnormally-shed antlers were compared with normally-shed antlers in terms of light condition,antler development and bone nutritional status during the abnormal shedding season in the growth area of Père David s deer.[Results]Abnormally-shed antlers had no significant differences in the development of shed antlers,or even in the overall composition of antlers,from those of normal Père David s deer.[Conclusions]Insufficient light was the main cause of abnormal antler shedding in Père David s deer.
基金supported by Research Program:the National Key Research and Development Plan-Research and Investigation of Technology and Equipment for Tea Plucking(Grant No.2016YFD0701502,China)the Modern Agricultural Technology System of Tea Industry(Grant No.CARS-19,China)+1 种基金The Innovating Program of the Chinese Academy of Agricultural Science,ChinaBasic scientific research found of Chinese Academy of Agricultural Science(S202005-03),Foundation of Key Laboratory of Modern Agricultural Equipment,Ministry of Agriculture and Rural Affairs,P.R.China.
文摘As agricultural labor is decreasing,famous tea production is nearly hard to sustain and is getting more and more expensive in China.To improve the mechanization of tea plucking,this paper designs a self-propelled track-type tea plucking machine that integrates mechanic,hydraulic and electronics.The main parameters of chassis were optimized based on conditions of tea garden.And,three different kinds of cutter blades were designed and analyzed about vibration performance with finite element software.Also,a rigid-flex mixed motion model was established.Based on the model and plots,it is explicit that:(1)the blades move in a sine law;(2)the blades take a symmetrical deform from middle to end while moving;(3)the deformation increases along the blade from the center to sides.The single factor experiment revealed that both travel speed and speed ratio of cutting and travelling had a significant effect on quality indexes(integrity rate,unpicking rate,stubble unevenness)of plucked tea leaf.By universal rotary combination experiment of quadratic regression,the regression equations of three indexes about two experimental factors were established.And,the comprehensive optimization of three indexes was conducted with software Design expert.The optimal operating parameters of machine are as follow:travel speed is 0.41 m/s,speed ratio of cutting and travelling is 1.06;prediction of three indexes are that integrity rate could be reach to 78.26%,unpicking rate reduced to 0.82%,stubble unevenness reduced to 1.30 mm.The results of verification experiment are that:integrity rate could be reach to 77.41%,unpicking rate reduced to 0.87%,stubble unevenness reduced to 1.23 mm.These test indexes that are very close to the predicted values,all surpass the requests specified in the standard of tea plucking with machine.In all,the optimized parameter set is indeed synthetically optimal one that enables the wide use of this tea plucking machine,which can be used in the tea garden that has a lengthways slope less than 18°,a crosswise slope l
