Significant differences among the doping densities of PN junctions in semiconductors cause lattice mismatch and lattice defects that increase the recombination current of betavoltaic batteries.This extensively decreas...Significant differences among the doping densities of PN junctions in semiconductors cause lattice mismatch and lattice defects that increase the recombination current of betavoltaic batteries.This extensively decreases the open circuit voltage and the short current,which results in low conversion efficiency.This study proposes P+PINN+-structure based betavoltaic batteries by adding an interlayer to typical PIN structures to improve conversion efficiency.Numerical simulations are conducted for the energy deposition of beta particles along the thickness direction in semiconductors.Based on this,63 Ni-radiation GaAs batteries with PIN and P+PINN+ structures are designed and fabricated to experimentally verify the proposed design.It turns out that the conversion efficiency of the betavoltaic battery with the proposed P+ PINN+ structure is about 1.45 times higher than that with the traditional PIN structure.展开更多
目的构建适合新型冠状病毒感染康复患者集生理、心理和社会功能康复于一体的知信行模式,评估以该模式为框架的系统作为支持性干预模式的有效性和实用性并验证其远期成效。方法选取100例符合新型冠状病毒感染的患者为研究对象,随机分为...目的构建适合新型冠状病毒感染康复患者集生理、心理和社会功能康复于一体的知信行模式,评估以该模式为框架的系统作为支持性干预模式的有效性和实用性并验证其远期成效。方法选取100例符合新型冠状病毒感染的患者为研究对象,随机分为干预组和对照组各50例,对照组进行常规治疗及健康教育,干预组在此基础上实施支持性干预方案。比较两组患者在干预前、干预后1个月、干预后3个月的心理及社会功能结局状况。结果干预组患者焦虑自评量表(Self-Rating Anxiety Scale,SAS)[1]和抑郁自评量表[2](Self-Rating Depression Scale,SDS)的得分均低于对照组干预后1个月、干预后3个月的得分,领悟社会支持量表(Perceived Social Support Scale,PSSS)、生活质量量表(Quality of Life Scale,QOL)评分均显著高于对照组干预后1个月、干预后3个月的得分,差异均有统计学意义(P<0.05)。结论知信行理论模式可缓解新型冠状病毒感染康复患者的焦虑及抑郁情绪,提高患者的生活质量和社会支持能力。展开更多
The steelmaking process scheduling problem by considering variable electricity price （SMSPVEP） was in- vestigated. A decomposition approach was proposed for the SMSPVEP. At the first stage, mathematical program-ming...The steelmaking process scheduling problem by considering variable electricity price （SMSPVEP） was in- vestigated. A decomposition approach was proposed for the SMSPVEP. At the first stage, mathematical program-ming was utilized to minimize the maximum completion time for each cast without considering variable electricity price. At the second stage, based on obtained relative schedules of all casts, a mathematical model was formulated with an objective of minimizing the energy cost for all casts scheduling problem. The two-stage models were tested on randomly generated instances based on the practical process in a Chinese steelmaking plant. Computational results demonstrate the effectiveness of the proposed approach.展开更多
基金Supported by the National Basic Research Program of China under Grant No 2011CB013000the National Natural Science Foundation of China under Grant Nos 90923039 and 51105037.
文摘Significant differences among the doping densities of PN junctions in semiconductors cause lattice mismatch and lattice defects that increase the recombination current of betavoltaic batteries.This extensively decreases the open circuit voltage and the short current,which results in low conversion efficiency.This study proposes P+PINN+-structure based betavoltaic batteries by adding an interlayer to typical PIN structures to improve conversion efficiency.Numerical simulations are conducted for the energy deposition of beta particles along the thickness direction in semiconductors.Based on this,63 Ni-radiation GaAs batteries with PIN and P+PINN+ structures are designed and fabricated to experimentally verify the proposed design.It turns out that the conversion efficiency of the betavoltaic battery with the proposed P+ PINN+ structure is about 1.45 times higher than that with the traditional PIN structure.
文摘目的构建适合新型冠状病毒感染康复患者集生理、心理和社会功能康复于一体的知信行模式,评估以该模式为框架的系统作为支持性干预模式的有效性和实用性并验证其远期成效。方法选取100例符合新型冠状病毒感染的患者为研究对象,随机分为干预组和对照组各50例,对照组进行常规治疗及健康教育,干预组在此基础上实施支持性干预方案。比较两组患者在干预前、干预后1个月、干预后3个月的心理及社会功能结局状况。结果干预组患者焦虑自评量表(Self-Rating Anxiety Scale,SAS)[1]和抑郁自评量表[2](Self-Rating Depression Scale,SDS)的得分均低于对照组干预后1个月、干预后3个月的得分,领悟社会支持量表(Perceived Social Support Scale,PSSS)、生活质量量表(Quality of Life Scale,QOL)评分均显著高于对照组干预后1个月、干预后3个月的得分,差异均有统计学意义(P<0.05)。结论知信行理论模式可缓解新型冠状病毒感染康复患者的焦虑及抑郁情绪,提高患者的生活质量和社会支持能力。
基金Item Sponsored by National Natural Science Foundation of China (71171038,71021061 )Fundamental Research Funds for Central Universities of China (N100504001)
文摘The steelmaking process scheduling problem by considering variable electricity price （SMSPVEP） was in- vestigated. A decomposition approach was proposed for the SMSPVEP. At the first stage, mathematical program-ming was utilized to minimize the maximum completion time for each cast without considering variable electricity price. At the second stage, based on obtained relative schedules of all casts, a mathematical model was formulated with an objective of minimizing the energy cost for all casts scheduling problem. The two-stage models were tested on randomly generated instances based on the practical process in a Chinese steelmaking plant. Computational results demonstrate the effectiveness of the proposed approach.
