Rechargeable aqueous zinc-ion hybrid capacitors and zincion batteries are promising safe energy storage systems.In this study,amorphous RuO2·H2O for the first time was employed to achieve fast and ultralong-life ...Rechargeable aqueous zinc-ion hybrid capacitors and zincion batteries are promising safe energy storage systems.In this study,amorphous RuO2·H2O for the first time was employed to achieve fast and ultralong-life Zn2+storage based on a pseudocapacitive storage mechanism.In the RuO2·H2O||Zn zinc-ion hybrid capacitors with Zn(CF3SO3)2 aqueous electrolyte,the RuO2·H2O cathode can reversibly store Zn2+in a voltage window of 0.4-1.6 V(vs.Zn/Zn2+),delivering a high discharge capacity of 122 mAh g?1.In particular,the zinc-ion hybrid capacitors can be rapidly charged/discharged within 36 s with a very high power density of 16.74 kW kg?1 and a high energy density of 82 Wh kg?1.Besides,the zinc-ion hybrid capacitors demonstrate an ultralong cycle life(over 10,000 charge/discharge cycles).The kinetic analysis elucidates that the ultrafast Zn2+storage in the RuO2·H2O cathode originates from redox pseudocapacitive reactions.This work could greatly facilitate the development of high-power and safe electrochemical energy storage.展开更多
The selection of power transformer is very important to power sector. Most methods are utilized according to the initial cost and don’t consider the synthetical evaluation of economy and technology. Based on previous...The selection of power transformer is very important to power sector. Most methods are utilized according to the initial cost and don’t consider the synthetical evaluation of economy and technology. Based on previous research, this paper addresses a new practical probabilistic life cycle cost model. Then, in order to demonstrate the practicability of probabilistic life cycle cost for the power transformer, illustrative investment alternatives of actual power transformers are discussed. From the result of the numerical investigation, it may be positively stated that the optimum investment alternative for the power transformer based on the probabilistic life cycle cost model proposed in this study will lead to a more rational, economical and effective procedure compared with the conventional method only considering the initial cost.展开更多
As a noted modern American playwright, David Mamet attracts wide attention from the readers, the audience, as well as the academic circle with his fascinating language features. In his plays, in order to achieve their...As a noted modern American playwright, David Mamet attracts wide attention from the readers, the audience, as well as the academic circle with his fascinating language features. In his plays, in order to achieve their individual goals, the male characters, applying the discursive power with language as weapon, endeavor to build a new structure of power. It aims to analyze A Life in the Theatre, with such discourse-analysis mechanics as turn-taking and politeness strategy, to examine the power relations between the two male characters in the play, and finally to explain how discourse influence and alter the power relations in reality.展开更多
In this paper, the power density and specific absorption rate (SAR) distribution in multi-layered life tissues and exposed to electromagnetic field emitted from handheld cellular phone operating in the 900 MHz and 180...In this paper, the power density and specific absorption rate (SAR) distribution in multi-layered life tissues and exposed to electromagnetic field emitted from handheld cellular phone operating in the 900 MHz and 1800 MHz is studied. We modeled a life tissue by four layered system to represent skin-fat-muscles-organs respectively. Matlab program and finite difference time domain (FDTD) computations were used to evaluator the electric, magnetic field, power density and specific absorption rate. A one dimensional FDTD algorithm has been built, some simulations for electromagnetic wave through the life tissue is made. Results show that electro magnetic fields penetrate the life tissues and attenuate fast to reach zero at the organs layer. The absorbent power and SAR show maximum at the skin and fat layers.展开更多
为量化评价新能源汽车动力电池回收利用过程的环境效益,为报废动力电池管理体系和回收再利用相关标准的完善提供支撑,助力国家“双碳”目标的实现,以三元锂电池为研究对象,选取典型的动力电池回收利用场景,将三元锂电池的生命周期划分为...为量化评价新能源汽车动力电池回收利用过程的环境效益,为报废动力电池管理体系和回收再利用相关标准的完善提供支撑,助力国家“双碳”目标的实现,以三元锂电池为研究对象,选取典型的动力电池回收利用场景,将三元锂电池的生命周期划分为4个阶段:原材料获取、制造装配、使用和报废回收,并建立相应的GaBi模型,基于湿法回收A、湿法回收B、火法-湿法联合回收3种不同回收利用方式进行三元锂电池生命周期评价模型搭建与回收再利用过程减碳成效测算。研究结果表明,三元锂电池回收再利用过程有较好的减碳成效,基于3种不同回收工艺的三元锂电池回收再利用可以减少CO_(2)排放量分别为:湿法回收A为60.71kgCO_(2)/kWh;湿法回收B为150.00kgCO_(2)/kWh;火法-湿法联合回收为153.57 kg CO_(2)/kWh。基于这3种不同回收工艺的CO_(2)减排效果从优至劣依次为:湿法-火法联合回收、湿法回收B和湿法回收A。合理的动力电池回收利用方式可以显著减少其回收利用过程中的碳排放量,从而产生更好的环境效益。展开更多
基金the financial support by the Australian Research Council through the ARC Discovery projects(DP160104340 and DP170100436)Rail Manufacturing Cooperative Research Centre(RMCRC 1.1.1 and RMCRC 1.1.2 projects)+1 种基金financially supported by the International Science&Technology Cooperation Program of China(No.2016YFE0102200)Shenzhen Technical Plan Project(No.JCYJ20160301154114273).
文摘Rechargeable aqueous zinc-ion hybrid capacitors and zincion batteries are promising safe energy storage systems.In this study,amorphous RuO2·H2O for the first time was employed to achieve fast and ultralong-life Zn2+storage based on a pseudocapacitive storage mechanism.In the RuO2·H2O||Zn zinc-ion hybrid capacitors with Zn(CF3SO3)2 aqueous electrolyte,the RuO2·H2O cathode can reversibly store Zn2+in a voltage window of 0.4-1.6 V(vs.Zn/Zn2+),delivering a high discharge capacity of 122 mAh g?1.In particular,the zinc-ion hybrid capacitors can be rapidly charged/discharged within 36 s with a very high power density of 16.74 kW kg?1 and a high energy density of 82 Wh kg?1.Besides,the zinc-ion hybrid capacitors demonstrate an ultralong cycle life(over 10,000 charge/discharge cycles).The kinetic analysis elucidates that the ultrafast Zn2+storage in the RuO2·H2O cathode originates from redox pseudocapacitive reactions.This work could greatly facilitate the development of high-power and safe electrochemical energy storage.
基金supported by the China Sustainable Energy Program,Energy Foundation(No.G-0911-11642)Environmental Protection Industry of Commonweal Project "Research on Co-control Policies and Demonstration of Air Pollution and Greenhouse Gas Emissions of Key Industries"(No.201009051)
文摘The selection of power transformer is very important to power sector. Most methods are utilized according to the initial cost and don’t consider the synthetical evaluation of economy and technology. Based on previous research, this paper addresses a new practical probabilistic life cycle cost model. Then, in order to demonstrate the practicability of probabilistic life cycle cost for the power transformer, illustrative investment alternatives of actual power transformers are discussed. From the result of the numerical investigation, it may be positively stated that the optimum investment alternative for the power transformer based on the probabilistic life cycle cost model proposed in this study will lead to a more rational, economical and effective procedure compared with the conventional method only considering the initial cost.
文摘As a noted modern American playwright, David Mamet attracts wide attention from the readers, the audience, as well as the academic circle with his fascinating language features. In his plays, in order to achieve their individual goals, the male characters, applying the discursive power with language as weapon, endeavor to build a new structure of power. It aims to analyze A Life in the Theatre, with such discourse-analysis mechanics as turn-taking and politeness strategy, to examine the power relations between the two male characters in the play, and finally to explain how discourse influence and alter the power relations in reality.
文摘In this paper, the power density and specific absorption rate (SAR) distribution in multi-layered life tissues and exposed to electromagnetic field emitted from handheld cellular phone operating in the 900 MHz and 1800 MHz is studied. We modeled a life tissue by four layered system to represent skin-fat-muscles-organs respectively. Matlab program and finite difference time domain (FDTD) computations were used to evaluator the electric, magnetic field, power density and specific absorption rate. A one dimensional FDTD algorithm has been built, some simulations for electromagnetic wave through the life tissue is made. Results show that electro magnetic fields penetrate the life tissues and attenuate fast to reach zero at the organs layer. The absorbent power and SAR show maximum at the skin and fat layers.
文摘为量化评价新能源汽车动力电池回收利用过程的环境效益,为报废动力电池管理体系和回收再利用相关标准的完善提供支撑,助力国家“双碳”目标的实现,以三元锂电池为研究对象,选取典型的动力电池回收利用场景,将三元锂电池的生命周期划分为4个阶段:原材料获取、制造装配、使用和报废回收,并建立相应的GaBi模型,基于湿法回收A、湿法回收B、火法-湿法联合回收3种不同回收利用方式进行三元锂电池生命周期评价模型搭建与回收再利用过程减碳成效测算。研究结果表明,三元锂电池回收再利用过程有较好的减碳成效,基于3种不同回收工艺的三元锂电池回收再利用可以减少CO_(2)排放量分别为:湿法回收A为60.71kgCO_(2)/kWh;湿法回收B为150.00kgCO_(2)/kWh;火法-湿法联合回收为153.57 kg CO_(2)/kWh。基于这3种不同回收工艺的CO_(2)减排效果从优至劣依次为:湿法-火法联合回收、湿法回收B和湿法回收A。合理的动力电池回收利用方式可以显著减少其回收利用过程中的碳排放量,从而产生更好的环境效益。
