为混凝技术在洗浴废水回用中更好地应用,采用了正交试验的方法.结果表明,对于试验研究废水,混凝技术的最佳反应条件为:PAC与PAM量投分别为180 m g/L和12.5 m g/L,pH值8.5,300 r.m i-n 1快速搅拌2.5 m in,45 r.m in-1慢速搅拌15 m in,静...为混凝技术在洗浴废水回用中更好地应用,采用了正交试验的方法.结果表明,对于试验研究废水,混凝技术的最佳反应条件为:PAC与PAM量投分别为180 m g/L和12.5 m g/L,pH值8.5,300 r.m i-n 1快速搅拌2.5 m in,45 r.m in-1慢速搅拌15 m in,静沉10 m in;影响因子相对重要性的大小次序为:PAC投量>pH值>慢速搅拌时间>慢速搅拌速度>PAM投量>静沉时间>快速搅拌速度>快速搅拌时间.单独使用混凝技术处理洗浴废水,出水水质可满足生活杂用水水质标准.展开更多
Water use and socio-economic development are interconnected in complex ways.Causalities are not easy to identify but it is evident that a nexus between water use and socio-economic development does exist.Considering t...Water use and socio-economic development are interconnected in complex ways.Causalities are not easy to identify but it is evident that a nexus between water use and socio-economic development does exist.Considering the diversity of national situations relating to these interrelated phenomena,its study should be considered from a global perspective.This article critically reviews the literature and information from official sources on the relevance of water use and circular economy in order to create a global picture,linking water with socio-economic development.Data from 195 countries were analyzed statistically.A factor analysis defined five essential latent dimensions on the nexus between water use and socio-economic development:development and basic services,population and resources,economic volume,health and well-being,and population density.Based on the identified factors,countries were classified into six groups:Global South in difficulty,global semi-periphery,advanced economy,Middle East and other Global South developing economy,global weight,and small highly developed economy.The clustering results clarify connections between water use conditions and socioeconomic development.Understanding the variety of national profiles is helpful to reveal the magnitude and urgency of dealing with the nexus between water use and socio-economic development for many countries.展开更多
Multibeam satellite communications employing full frequency reuse have the potential to increase spectral efficiency.However,they suffer from severe inter-beam interference.An expectation propagation based message pas...Multibeam satellite communications employing full frequency reuse have the potential to increase spectral efficiency.However,they suffer from severe inter-beam interference.An expectation propagation based message passing algorithm is proposed for decoding multi-user transmissions in the reverse link of multi-beam satellite communications with full frequency reuse.Compared with an iterative MMSE(Minimum Mean Square Error)interference cancellation algorithm,the proposed algorithm reduces the cubic complexity to square complexity in the number of interfering beams.Numerical results show that the proposed algorithm outperforms the iterative MMSE algorithm slightly in terms of bit error rate when the energy per bit to noise power spectral density ratio is low.The performance of both algorithms is the same for other cases.展开更多
文摘为混凝技术在洗浴废水回用中更好地应用,采用了正交试验的方法.结果表明,对于试验研究废水,混凝技术的最佳反应条件为:PAC与PAM量投分别为180 m g/L和12.5 m g/L,pH值8.5,300 r.m i-n 1快速搅拌2.5 m in,45 r.m in-1慢速搅拌15 m in,静沉10 m in;影响因子相对重要性的大小次序为:PAC投量>pH值>慢速搅拌时间>慢速搅拌速度>PAM投量>静沉时间>快速搅拌速度>快速搅拌时间.单独使用混凝技术处理洗浴废水,出水水质可满足生活杂用水水质标准.
基金support from the Fundação para a Ciência e a Tecnologia(FCT)Foundation for Science and Technology(DL57/2016/CP1341/CT0013).
文摘Water use and socio-economic development are interconnected in complex ways.Causalities are not easy to identify but it is evident that a nexus between water use and socio-economic development does exist.Considering the diversity of national situations relating to these interrelated phenomena,its study should be considered from a global perspective.This article critically reviews the literature and information from official sources on the relevance of water use and circular economy in order to create a global picture,linking water with socio-economic development.Data from 195 countries were analyzed statistically.A factor analysis defined five essential latent dimensions on the nexus between water use and socio-economic development:development and basic services,population and resources,economic volume,health and well-being,and population density.Based on the identified factors,countries were classified into six groups:Global South in difficulty,global semi-periphery,advanced economy,Middle East and other Global South developing economy,global weight,and small highly developed economy.The clustering results clarify connections between water use conditions and socioeconomic development.Understanding the variety of national profiles is helpful to reveal the magnitude and urgency of dealing with the nexus between water use and socio-economic development for many countries.
基金supported by the National Natural Science Foundation of China(Nos.91338101,91438206).
文摘Multibeam satellite communications employing full frequency reuse have the potential to increase spectral efficiency.However,they suffer from severe inter-beam interference.An expectation propagation based message passing algorithm is proposed for decoding multi-user transmissions in the reverse link of multi-beam satellite communications with full frequency reuse.Compared with an iterative MMSE(Minimum Mean Square Error)interference cancellation algorithm,the proposed algorithm reduces the cubic complexity to square complexity in the number of interfering beams.Numerical results show that the proposed algorithm outperforms the iterative MMSE algorithm slightly in terms of bit error rate when the energy per bit to noise power spectral density ratio is low.The performance of both algorithms is the same for other cases.
