造纸污水具有处理量大、有机物污染负荷高的特点,但是对其处理过程中温室气体的大量排放长期以来关注不足。以国际公认的BSM1平台为基础,采用Benchmark simulation model No.1(BSM1)标准数据,根据微生物生长动力学及物料平衡关系,从污...造纸污水具有处理量大、有机物污染负荷高的特点,但是对其处理过程中温室气体的大量排放长期以来关注不足。以国际公认的BSM1平台为基础,采用Benchmark simulation model No.1(BSM1)标准数据,根据微生物生长动力学及物料平衡关系,从污水生化处理工艺的四个方面,建立了温室气体排放计算模型,实现了污水生化处理过程中温室气体排放的动态计算。研究结果表明,污水生化处理过程中的总温室气体排放量为0.419 kg CO_2/m^3污水,其中具有高温室效应潜势的N_2O对温室气体的总排放的影响高达13%,应引起重视。展开更多
The orthogonality between the subcarriers of multipleinput multiple-output orthogonal frequency division multiplexing( MIMO-OFDM) systems is destroyed due to the Doppler frequency offset,particularly in the high-speed...The orthogonality between the subcarriers of multipleinput multiple-output orthogonal frequency division multiplexing( MIMO-OFDM) systems is destroyed due to the Doppler frequency offset,particularly in the high-speed train( HST) environment,which leads to severe inter-carrier interference( ICI). Therefore,it is necessary to analyze the mechanism and influence factor of ICI in HST environment. In this paper, by using a non-stationary geometry-based stochastic model( GBSM) for MIMO HST channels, ICI is analyzed through investigating the channel coefficients and the carrier-to-interference power ratio( CIR). It is a fact that most of signal energy spreads on itself and its several neighborhood subcarriers. By investigating the amplitude of subcarriers, CIR is used to evaluate the ICI power level. The simulation results show that the biggest impact factor for the CIR is the multipath number L and the minimum impact factor K; when the train speed υR> 400 km / h,the normalized Doppler frequency offset ε > 0. 35,the CIR tends to zero,and the communication quality will be very poor at this condition. Finally,bit error rate( BER) is investigated by simulating a specific channel environment.展开更多
文摘造纸污水具有处理量大、有机物污染负荷高的特点,但是对其处理过程中温室气体的大量排放长期以来关注不足。以国际公认的BSM1平台为基础,采用Benchmark simulation model No.1(BSM1)标准数据,根据微生物生长动力学及物料平衡关系,从污水生化处理工艺的四个方面,建立了温室气体排放计算模型,实现了污水生化处理过程中温室气体排放的动态计算。研究结果表明,污水生化处理过程中的总温室气体排放量为0.419 kg CO_2/m^3污水,其中具有高温室效应潜势的N_2O对温室气体的总排放的影响高达13%,应引起重视。
基金National Natural Science Foundation of China(No.61271213)
文摘The orthogonality between the subcarriers of multipleinput multiple-output orthogonal frequency division multiplexing( MIMO-OFDM) systems is destroyed due to the Doppler frequency offset,particularly in the high-speed train( HST) environment,which leads to severe inter-carrier interference( ICI). Therefore,it is necessary to analyze the mechanism and influence factor of ICI in HST environment. In this paper, by using a non-stationary geometry-based stochastic model( GBSM) for MIMO HST channels, ICI is analyzed through investigating the channel coefficients and the carrier-to-interference power ratio( CIR). It is a fact that most of signal energy spreads on itself and its several neighborhood subcarriers. By investigating the amplitude of subcarriers, CIR is used to evaluate the ICI power level. The simulation results show that the biggest impact factor for the CIR is the multipath number L and the minimum impact factor K; when the train speed υR> 400 km / h,the normalized Doppler frequency offset ε > 0. 35,the CIR tends to zero,and the communication quality will be very poor at this condition. Finally,bit error rate( BER) is investigated by simulating a specific channel environment.
