In this study,the authors proposed a promising structure design,the micro-crosslinked polypropylene(PP),to enhance the high-temperature energy storage density.With the grafting of 1,6,7,12-tetrachlorinated perylene-N-...In this study,the authors proposed a promising structure design,the micro-crosslinked polypropylene(PP),to enhance the high-temperature energy storage density.With the grafting of 1,6,7,12-tetrachlorinated perylene-N-2-aminoethyl acrylate-Nʹ-dodecylamine-3,4,9,10-tetracarboxylic bisimide(PTCDA)onto PP molecules,the obtained PP-g-PTCDA achieved a superior energy storage density of 2.34 J/cm^(3)at 120℃ with the discharge efficiency above 90%,which was 585%higher than that of neat PP.The great enhancement,on the one hand,originated from the micro-crosslinked structure,since the restricted molecular motion can lead to the suppression of electrons'hopping across the molecular chains.On the other hand,deep traps were also introduced in PP-g-PTCDA,which restricted the electrons'hopping along the molecular chains simultaneously.This work provided an orientation to enhance the energy storage density at an elevated temperature of 120℃.展开更多
Introduction:Between 50%and 85%of children experience at least one episode of acute otitis media(AOM)by age three.Since the coronavirus disease 2019(COVID-19)pandemic,numerous hospitals across China have integrated te...Introduction:Between 50%and 85%of children experience at least one episode of acute otitis media(AOM)by age three.Since the coronavirus disease 2019(COVID-19)pandemic,numerous hospitals across China have integrated telehealth solutions into their pediatric care services.Our research team introduced the Telehealth and Autonomous Mobile Clinic Framework,which was published in the Bulletin of the World Health Organization in September 2022.Methods:The investigation employed a retrospective cohort design.The study population comprised 200 pediatric patients diagnosed with AOM who received either telehealth follow-up consultation or traditional in-person clinic visits.Bivariate analyses examined relationships between telehealth follow-up consultation and patient outcome in ear pain,hearing loss,and patient satisfaction between telehealth and inperson AOM follow-up groups.Multivariate regression analysis evaluated associations between ear pain(a primary clinical outcome)and telehealth utilization,hearing loss,and patient satisfaction,with adjustments for age and gender.Results:Ear pain relief was reported by 84%of patients in the telehealth follow-up group compared to 81%in the in-person follow-up group,showing no statistically significant difference(P=0.57).Hearing loss was documented in 21 cases from the telehealth group and 23 cases from the in-person follow-up group(P=0.73).Patient satisfaction scores were comparable between groups,with mean scores of 4.47(range:2.47–4.92)for telehealth and 4.49(range:2.72–4.94)for in-person follow-up(P=0.87).Multivariate regression revealed no significant difference in patient satisfaction between telehealth and in-person follow-up(P=0.21).Conclusion:This retrospective study provides compelling evidence for the effectiveness and feasibility of telehealth follow-up consultations in pediatric otitis media management.Our findings demonstrate that telehealth consultations achieve comparable outcomes to in-person follow-up visits for AOM patients.展开更多
C_(5)F_(10)O/CO_(2)gas mixture is one of the most promising alternatives to SF_(6)as an insulating gas in high-voltage switchgear.As a key performance index in product design,the temperature rise characteristics are r...C_(5)F_(10)O/CO_(2)gas mixture is one of the most promising alternatives to SF_(6)as an insulating gas in high-voltage switchgear.As a key performance index in product design,the temperature rise characteristics are rarely reported.In this paper,the thermodynamic parameters of C_(5)F_(10)O/CO_(2)gas mixture were calculated first.Then,the calculation model of transient temperature rise was constructed for a 252 kV/3150 A bus,and a temperature rise experimental platform was built to verify the reliability of the proposed calculation model.On this basis,the influence of different factors such as load current,charging pressure,mixing ratio,and structure size on the temperature rise of the bus was further analysed,and it is found that increasing the charging pressure and the mixing ratio of C5F10O could effectively reduce the bus temperature rise but it still could not reach the level of SF_(6).The main structure size that affects the temperature rise of the bus is the outer diameter of the conductor,which increases by 10.2%,and the temperature rise is the same as that of the original SF_(6)bus.Finally,a high-precision bus temperature rise surrogate model,which combined with the Latin hypercube model,the coefficient of prognosis,and the Kriging fitting method was established to facilitate the structural design.展开更多
基金National Natural Science Foundation of China,Grant/Award Numbers:52077163,52107025。
文摘In this study,the authors proposed a promising structure design,the micro-crosslinked polypropylene(PP),to enhance the high-temperature energy storage density.With the grafting of 1,6,7,12-tetrachlorinated perylene-N-2-aminoethyl acrylate-Nʹ-dodecylamine-3,4,9,10-tetracarboxylic bisimide(PTCDA)onto PP molecules,the obtained PP-g-PTCDA achieved a superior energy storage density of 2.34 J/cm^(3)at 120℃ with the discharge efficiency above 90%,which was 585%higher than that of neat PP.The great enhancement,on the one hand,originated from the micro-crosslinked structure,since the restricted molecular motion can lead to the suppression of electrons'hopping across the molecular chains.On the other hand,deep traps were also introduced in PP-g-PTCDA,which restricted the electrons'hopping along the molecular chains simultaneously.This work provided an orientation to enhance the energy storage density at an elevated temperature of 120℃.
文摘Introduction:Between 50%and 85%of children experience at least one episode of acute otitis media(AOM)by age three.Since the coronavirus disease 2019(COVID-19)pandemic,numerous hospitals across China have integrated telehealth solutions into their pediatric care services.Our research team introduced the Telehealth and Autonomous Mobile Clinic Framework,which was published in the Bulletin of the World Health Organization in September 2022.Methods:The investigation employed a retrospective cohort design.The study population comprised 200 pediatric patients diagnosed with AOM who received either telehealth follow-up consultation or traditional in-person clinic visits.Bivariate analyses examined relationships between telehealth follow-up consultation and patient outcome in ear pain,hearing loss,and patient satisfaction between telehealth and inperson AOM follow-up groups.Multivariate regression analysis evaluated associations between ear pain(a primary clinical outcome)and telehealth utilization,hearing loss,and patient satisfaction,with adjustments for age and gender.Results:Ear pain relief was reported by 84%of patients in the telehealth follow-up group compared to 81%in the in-person follow-up group,showing no statistically significant difference(P=0.57).Hearing loss was documented in 21 cases from the telehealth group and 23 cases from the in-person follow-up group(P=0.73).Patient satisfaction scores were comparable between groups,with mean scores of 4.47(range:2.47–4.92)for telehealth and 4.49(range:2.72–4.94)for in-person follow-up(P=0.87).Multivariate regression revealed no significant difference in patient satisfaction between telehealth and in-person follow-up(P=0.21).Conclusion:This retrospective study provides compelling evidence for the effectiveness and feasibility of telehealth follow-up consultations in pediatric otitis media management.Our findings demonstrate that telehealth consultations achieve comparable outcomes to in-person follow-up visits for AOM patients.
基金Sichuan Science and Technology Program,Grant/Award Number:2023NSFSC0297。
文摘C_(5)F_(10)O/CO_(2)gas mixture is one of the most promising alternatives to SF_(6)as an insulating gas in high-voltage switchgear.As a key performance index in product design,the temperature rise characteristics are rarely reported.In this paper,the thermodynamic parameters of C_(5)F_(10)O/CO_(2)gas mixture were calculated first.Then,the calculation model of transient temperature rise was constructed for a 252 kV/3150 A bus,and a temperature rise experimental platform was built to verify the reliability of the proposed calculation model.On this basis,the influence of different factors such as load current,charging pressure,mixing ratio,and structure size on the temperature rise of the bus was further analysed,and it is found that increasing the charging pressure and the mixing ratio of C5F10O could effectively reduce the bus temperature rise but it still could not reach the level of SF_(6).The main structure size that affects the temperature rise of the bus is the outer diameter of the conductor,which increases by 10.2%,and the temperature rise is the same as that of the original SF_(6)bus.Finally,a high-precision bus temperature rise surrogate model,which combined with the Latin hypercube model,the coefficient of prognosis,and the Kriging fitting method was established to facilitate the structural design.
