储能系统成本高、控制技术不成熟,制约了电池储能系统的大规模应用。在充分考虑电池储能系统经济性基础上,该文提出了基于双向互补的储能系统控制策略。由2组电池构成双向互补电池储能系统,通过雨流计数法计算电池充放电深度(depth of d...储能系统成本高、控制技术不成熟,制约了电池储能系统的大规模应用。在充分考虑电池储能系统经济性基础上,该文提出了基于双向互补的储能系统控制策略。由2组电池构成双向互补电池储能系统,通过雨流计数法计算电池充放电深度(depth of discharge,DoD),以表征电池循环寿命,并建立了双向互补储能系统充放电控制模型。基于国内某光-储联合电站实测数据,在储能系统不同充放电临界荷电状态限定范围内,对双向互补电池储能系统控制策略的经济性进行了仿真分析。仿真结果表明,与单储能系统控制策略相比,基于双向互补的电池储能系统控制策略可以有效提高电池储能系统的使用寿命,降低储能系统成本,具有良好的工程应用前景。展开更多
Background Asthma is a significant chronic health problem worldwide. Management aims at disease control by reducing functional impairment and exacerbations and improving quality of life (QoL). We report a multi-center...Background Asthma is a significant chronic health problem worldwide. Management aims at disease control by reducing functional impairment and exacerbations and improving quality of life (QoL). We report a multi-center study to survey asthma control and QoL in four cities in the Pearl River Delta. Methods The conjoint survey involved ten Hong Kong pediatric hospitals/units, two Shenzhen hospitals, two Macao hos-pitals, and two Guangzhou hospitals on asthma control (using Asthma Control Test) and QoL (Pediatric Allergic Disease Quality of Life Questionnaire, PADQLQ). Acceptability of a treatment is graded as very good/good/fair/poor. Results Good asthma control was only reported in 80% subjects in Hong Kong, but higher in sister cities (85–94%, P<0.001). Allergic rhinitis, 'incense burning', and 'smoker in family' were prevalent among the four cities. Logistic regres-sion showed better control of asthma was associated with better PADQLQ (B=?0.029, P < 0.001), better acceptability of bronchodilator (B=?1.488, P = 0.025), negatively with 'smoker in family' (B=?0.83, P = 0.015) and various PADQLQ domains. Conversely, worse PADQLQ was associated with allergic rhinitis severity (B=4.77, P <0.001), poor control of asthma (B=7.56, P <0.001), increased frequency of traditional Chinese medicine use (B=1.7, P < 0.05), increased fre-quency of bronchodilator usage (B=1.05, P < 0.05), 'smoker in family' (B=4.05, P < 0.05), and incense burning at home (B=3.9, P < 0.05). Conclusions There are some clinical and cultural differences among the four southern Chinese cities within the Guangdong province. This study identifies potentially modifiable environmental and treatment factors associated with poor asthma control and QoL for health-care interventions. Having a smoker in the family is independently associated with poor asthma control and QoL.展开更多
文摘储能系统成本高、控制技术不成熟,制约了电池储能系统的大规模应用。在充分考虑电池储能系统经济性基础上,该文提出了基于双向互补的储能系统控制策略。由2组电池构成双向互补电池储能系统,通过雨流计数法计算电池充放电深度(depth of discharge,DoD),以表征电池循环寿命,并建立了双向互补储能系统充放电控制模型。基于国内某光-储联合电站实测数据,在储能系统不同充放电临界荷电状态限定范围内,对双向互补电池储能系统控制策略的经济性进行了仿真分析。仿真结果表明,与单储能系统控制策略相比,基于双向互补的电池储能系统控制策略可以有效提高电池储能系统的使用寿命,降低储能系统成本,具有良好的工程应用前景。
文摘Background Asthma is a significant chronic health problem worldwide. Management aims at disease control by reducing functional impairment and exacerbations and improving quality of life (QoL). We report a multi-center study to survey asthma control and QoL in four cities in the Pearl River Delta. Methods The conjoint survey involved ten Hong Kong pediatric hospitals/units, two Shenzhen hospitals, two Macao hos-pitals, and two Guangzhou hospitals on asthma control (using Asthma Control Test) and QoL (Pediatric Allergic Disease Quality of Life Questionnaire, PADQLQ). Acceptability of a treatment is graded as very good/good/fair/poor. Results Good asthma control was only reported in 80% subjects in Hong Kong, but higher in sister cities (85–94%, P<0.001). Allergic rhinitis, 'incense burning', and 'smoker in family' were prevalent among the four cities. Logistic regres-sion showed better control of asthma was associated with better PADQLQ (B=?0.029, P < 0.001), better acceptability of bronchodilator (B=?1.488, P = 0.025), negatively with 'smoker in family' (B=?0.83, P = 0.015) and various PADQLQ domains. Conversely, worse PADQLQ was associated with allergic rhinitis severity (B=4.77, P <0.001), poor control of asthma (B=7.56, P <0.001), increased frequency of traditional Chinese medicine use (B=1.7, P < 0.05), increased fre-quency of bronchodilator usage (B=1.05, P < 0.05), 'smoker in family' (B=4.05, P < 0.05), and incense burning at home (B=3.9, P < 0.05). Conclusions There are some clinical and cultural differences among the four southern Chinese cities within the Guangdong province. This study identifies potentially modifiable environmental and treatment factors associated with poor asthma control and QoL for health-care interventions. Having a smoker in the family is independently associated with poor asthma control and QoL.
