Electrolyte optimization for Fe/V redox flow battery system Bin Li, Wei Wang, Zimin Nie, Vince Sp... more Electrolyte optimization for Fe/V redox flow battery system Bin Li, Wei Wang, Zimin Nie, Vince Sprenkle, Baowei Chen, Xiaoliang Wei, Qingtao Luo, Guanguang Xia, Liyu Li and Zhenguo Yang Pacific Northwest National Laboratory 902 Battelle Boulevard, PO Box 999, Richland, WA 99354 Abstract Redox flow batteries (RFBs) research and development have recently enjoyed a renaissance primarily due to their ability to store large amounts of power and energy, up to multi-MW and multi-MWh, respectively, for renewable energy integration or smart-grid deployment.1 Broad market penetration, however, has not been achieved due to several limitations such as high cost, instability in long-term operation, and narrow operational temperature range, etc. Recently invented Fe/V redox flow battery (IVRFB) has attracted more and more attentions due to its long-term cycling stability and the freedom to utilize membranes other than expensive Nafion.2 In this study, extensive matrix study was performed on the F...
Microporous Separators on Fe/V Redox Flow Battery: A Valuable Opportunity for Cost Reduction Wei,... more Microporous Separators on Fe/V Redox Flow Battery: A Valuable Opportunity for Cost Reduction Wei, Xiaoliang; Luo, Qingtao; Li, Bin; Nie, Zimin; Shao, Yuyan; Chen, Feng; Chen, Baowei; Xia, Gordon; Li, Liyu; Yang, Z Gary; Wang, Wei Pacific Northwest National Laboratory, 902 Battelle Boulevard, PO Box 999, Richland, WA 99354 Redox flow batteries are considered as one of the most promising medium-to-large scale energy storage technologies and have attracted much attention both academically and industrially.[1],[2] A number of redox chemistries have been proposed, and significant progress has been achieved by today.[3],[4] However, broad market penetration of redox flow batteries is still hindered by their intrinsic limitations such as high cost and low durability of components, narrow operational temperature range, limited solubility of active species, and/or low electrochemical activity.[5] The recently invented iron-vanadium (Fe/V) redox flow battery employing Fe2+/3+ V2+/3+ redox cou...
Three Nafion® membranes of similar composition but different thicknesses were operated in a 3-cel... more Three Nafion® membranes of similar composition but different thicknesses were operated in a 3-cell 1 kW class all vanadium mixed acid redox flow battery. The influence of current density on the charge/discharge characteristics, coulombic and energy efficiency, capacity fade, operating temperature and pressure drop in the flow circuit will be discussed and correlated to the Nafion® membrane thickness. Material costs associated with the Nafion® membranes, ease of handling the membranes, and performance impacts will also be discussed.
For these communication systems whose transmitted waveforms have a much closed signal space, such... more For these communication systems whose transmitted waveforms have a much closed signal space, such as the attractive Ultra Narrow-band (UNB) modulation technology, it is rather toilsome to obtain the satisfactory performance because of the difficulty in accurately determining the threshold of the optimum receiver, which is mainly caused by its tiny waveform dipartition as well as the unruly DC variant. To response this realistic challenge, a novel nonlinear transform in receiver has been proposed in this paper. It is demonstrated that our presented scheme can indeed improve the BER performance of the Ultra Narrow-band system.
Attributed to complex and dynamic propagations in underwater acoustic sensors network, the multip... more Attributed to complex and dynamic propagations in underwater acoustic sensors network, the multipath signals has posed great challenges in the receiver designing in past decades of years. In this paper, we adopt the UWB channel model in underwater networks and suggest a blind non-coherent receiver. Some differentiated features have been developed to represent the multipath signals. Then, we formulate the underwater signal detection as a data mining process. Fuzzy c-means clustering (FCM) algorithm is finally adopted to perform blind signal detection. Numerical simulations show that our scheme outperforms the traditional noncoherent techniques.
In the emerging energy efficient framework, power allocation for ultra wide band (UWB) is much si... more In the emerging energy efficient framework, power allocation for ultra wide band (UWB) is much significant given its extremely large bandwidth. For multi-band UWB, this area has been extensively researched in the context of OFDM resources allocation. For pulse-based UWB, however, there is still an urgent need for efficient waveform design technique to embody arbitrary power allocation strategy. In this paper, we present a UWB waveform design method based on the radius basis network neural networks (RBF). The power density spectrum of emitted waveform is firstly abstract to a general mathematic function. Then based on the interpolation theory, RBF network is adopted to generate UWB waveforms given any spectrum shape. Numerical simulations validate our algorithms through the water filling (WF) waveforms shaping.
Zhongguo yi liao qi xie za zhi = Chinese journal of medical instrumentation
This article introduces the present development situations and research progress on key technolog... more This article introduces the present development situations and research progress on key technologies of BAN. After a review on BAN propagation channel modeling, transmission technologies and multiple accessing methods, the technical difficulties as well as the focus of study both at home and abroad are discussed. We further put forward the new appealing technologies and their practical feasibility.
In cognitive radio systems, cooperative spectrum sensing among cognitive users is necessary in or... more In cognitive radio systems, cooperative spectrum sensing among cognitive users is necessary in order to increase the reliability of detection. However, when the number of cognitive users tends to be very large, the system overhead for reporting their sensing results to the common receiver will be huge. In this paper, we present a novel efficient cooperative spectrum sensing scheme based on orthogonal waveforms design. By designing mutual orthogonal waveforms for different sensing bits, all the users are allowed to transmit their sensing information simultaneously on the same available band. Analytical results demonstrate that it can significantly outperform TDMA and FDMA schemes on the improvement of the transmission efficiency, especially for large-scale CR networks.
We present an efficient codeword search algorithm for limited feedback MIMO beamforming systems. ... more We present an efficient codeword search algorithm for limited feedback MIMO beamforming systems. Given a predefined codebook, identifying the best beamforming codeword may easily become inefficient in terms of computational complexity. To reduce the computational complexity during the codeword searching process, we propose a novel (off-line) preprocessing scheme, which specifies the feasible condition for efficient searching. By exploiting the triangle inequality principle for distance, we develop a promising kick-out condition to avoid computing the chordal distance in the presence of non-optimal codewords of the input vector. Numerical experimental results have shown that the computational burden of our proposed algorithm has been significantly reduced compared with the traditional exhaustive search.
Electrolyte optimization for Fe/V redox flow battery system Bin Li, Wei Wang, Zimin Nie, Vince Sp... more Electrolyte optimization for Fe/V redox flow battery system Bin Li, Wei Wang, Zimin Nie, Vince Sprenkle, Baowei Chen, Xiaoliang Wei, Qingtao Luo, Guanguang Xia, Liyu Li and Zhenguo Yang Pacific Northwest National Laboratory 902 Battelle Boulevard, PO Box 999, Richland, WA 99354 Abstract Redox flow batteries (RFBs) research and development have recently enjoyed a renaissance primarily due to their ability to store large amounts of power and energy, up to multi-MW and multi-MWh, respectively, for renewable energy integration or smart-grid deployment.1 Broad market penetration, however, has not been achieved due to several limitations such as high cost, instability in long-term operation, and narrow operational temperature range, etc. Recently invented Fe/V redox flow battery (IVRFB) has attracted more and more attentions due to its long-term cycling stability and the freedom to utilize membranes other than expensive Nafion.2 In this study, extensive matrix study was performed on the F...
Microporous Separators on Fe/V Redox Flow Battery: A Valuable Opportunity for Cost Reduction Wei,... more Microporous Separators on Fe/V Redox Flow Battery: A Valuable Opportunity for Cost Reduction Wei, Xiaoliang; Luo, Qingtao; Li, Bin; Nie, Zimin; Shao, Yuyan; Chen, Feng; Chen, Baowei; Xia, Gordon; Li, Liyu; Yang, Z Gary; Wang, Wei Pacific Northwest National Laboratory, 902 Battelle Boulevard, PO Box 999, Richland, WA 99354 Redox flow batteries are considered as one of the most promising medium-to-large scale energy storage technologies and have attracted much attention both academically and industrially.[1],[2] A number of redox chemistries have been proposed, and significant progress has been achieved by today.[3],[4] However, broad market penetration of redox flow batteries is still hindered by their intrinsic limitations such as high cost and low durability of components, narrow operational temperature range, limited solubility of active species, and/or low electrochemical activity.[5] The recently invented iron-vanadium (Fe/V) redox flow battery employing Fe2+/3+ V2+/3+ redox cou...
Three Nafion® membranes of similar composition but different thicknesses were operated in a 3-cel... more Three Nafion® membranes of similar composition but different thicknesses were operated in a 3-cell 1 kW class all vanadium mixed acid redox flow battery. The influence of current density on the charge/discharge characteristics, coulombic and energy efficiency, capacity fade, operating temperature and pressure drop in the flow circuit will be discussed and correlated to the Nafion® membrane thickness. Material costs associated with the Nafion® membranes, ease of handling the membranes, and performance impacts will also be discussed.
For these communication systems whose transmitted waveforms have a much closed signal space, such... more For these communication systems whose transmitted waveforms have a much closed signal space, such as the attractive Ultra Narrow-band (UNB) modulation technology, it is rather toilsome to obtain the satisfactory performance because of the difficulty in accurately determining the threshold of the optimum receiver, which is mainly caused by its tiny waveform dipartition as well as the unruly DC variant. To response this realistic challenge, a novel nonlinear transform in receiver has been proposed in this paper. It is demonstrated that our presented scheme can indeed improve the BER performance of the Ultra Narrow-band system.
Attributed to complex and dynamic propagations in underwater acoustic sensors network, the multip... more Attributed to complex and dynamic propagations in underwater acoustic sensors network, the multipath signals has posed great challenges in the receiver designing in past decades of years. In this paper, we adopt the UWB channel model in underwater networks and suggest a blind non-coherent receiver. Some differentiated features have been developed to represent the multipath signals. Then, we formulate the underwater signal detection as a data mining process. Fuzzy c-means clustering (FCM) algorithm is finally adopted to perform blind signal detection. Numerical simulations show that our scheme outperforms the traditional noncoherent techniques.
In the emerging energy efficient framework, power allocation for ultra wide band (UWB) is much si... more In the emerging energy efficient framework, power allocation for ultra wide band (UWB) is much significant given its extremely large bandwidth. For multi-band UWB, this area has been extensively researched in the context of OFDM resources allocation. For pulse-based UWB, however, there is still an urgent need for efficient waveform design technique to embody arbitrary power allocation strategy. In this paper, we present a UWB waveform design method based on the radius basis network neural networks (RBF). The power density spectrum of emitted waveform is firstly abstract to a general mathematic function. Then based on the interpolation theory, RBF network is adopted to generate UWB waveforms given any spectrum shape. Numerical simulations validate our algorithms through the water filling (WF) waveforms shaping.
Zhongguo yi liao qi xie za zhi = Chinese journal of medical instrumentation
This article introduces the present development situations and research progress on key technolog... more This article introduces the present development situations and research progress on key technologies of BAN. After a review on BAN propagation channel modeling, transmission technologies and multiple accessing methods, the technical difficulties as well as the focus of study both at home and abroad are discussed. We further put forward the new appealing technologies and their practical feasibility.
In cognitive radio systems, cooperative spectrum sensing among cognitive users is necessary in or... more In cognitive radio systems, cooperative spectrum sensing among cognitive users is necessary in order to increase the reliability of detection. However, when the number of cognitive users tends to be very large, the system overhead for reporting their sensing results to the common receiver will be huge. In this paper, we present a novel efficient cooperative spectrum sensing scheme based on orthogonal waveforms design. By designing mutual orthogonal waveforms for different sensing bits, all the users are allowed to transmit their sensing information simultaneously on the same available band. Analytical results demonstrate that it can significantly outperform TDMA and FDMA schemes on the improvement of the transmission efficiency, especially for large-scale CR networks.
We present an efficient codeword search algorithm for limited feedback MIMO beamforming systems. ... more We present an efficient codeword search algorithm for limited feedback MIMO beamforming systems. Given a predefined codebook, identifying the best beamforming codeword may easily become inefficient in terms of computational complexity. To reduce the computational complexity during the codeword searching process, we propose a novel (off-line) preprocessing scheme, which specifies the feasible condition for efficient searching. By exploiting the triangle inequality principle for distance, we develop a promising kick-out condition to avoid computing the chordal distance in the presence of non-optimal codewords of the input vector. Numerical experimental results have shown that the computational burden of our proposed algorithm has been significantly reduced compared with the traditional exhaustive search.
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