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Fuel Economy Analysis of a Series Hybrid Electric Bus with Low-Speed Shutdown Control Strategy
Xiaogang Wu,Han Chen,Jiuyu Du,Chen Hu 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.10
The series hybrid electric bus that is demonstrated operating in China has the problem of non-ideal fuel economy for the conventional auxiliary equipment can’t shut down the engine. Based on the series hybrid electric bus using electric auxiliary equipment, a control strategy is proposed based on the combination of engine low-speed shutdown and load following. The main control variables are battery SOC and vehicle speed, and the engine low-speed shutdown is realized. Three different driving cycles are employed: Chinese city driving cycle, Zhuzhou city of Hunan province driving cycle, and Hefei city of Anhui province driving cycle. By using the analysis method of the energy flow diagram, the fuel economy in different driving cycles is compared and analyzed. The simulation results show that the control strategy of the engine low-speed shutdown affects little on fuel economy in different driving cycles. All the fuel-saving ratios of the series hybrid system in different driving cycles can reach above 25%.
Three-Dimensional Porous Carbon Nanotube Papers as Current Collector and Buffer for SnO2 Anodes
Xiaogang Sun,Zhiwen Qiu,Long Chen,Manyuan Cai,Jie Wang,Xu Li,Wei Chen,Zhenhong Liu,Hao Tang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.11
A novel three-dimensional porous conductive papers have been successfully synthesized via a simple physical route. Multi-walled carbon nanotubes (MWCNTs)@SnO2 composite anode materials are embedded in porous conductive papers. The peculiar structure can accommodate the huge volume expansion of MWCNTs@SnO2 composite anode materials during charge–discharge process. The framework formed by MWCNTs and cellulose can greatly improve the strength, stability and flexibility of the electrode. In addition, the structure successfully prevent the aggregation of SnO2 nanoparticles and collapse of MWCNTs@SnO2 composite electrode, leading to the improvement in electrochemical utilization and stable cyclability. The samples were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM), respectively. The electrochemical properties and application were evaluated by galvanostatic discharge–charge testing and cycling voltammetry. As a result, the MWCNTs@SnO2 composite electrode showed excellent rate performance. The discharge capacity remains about 680mAh g -1 after 100 cycles at 200mA g -1, and even around 300mAh g -1 at 1000mA g -1.
SonicStream: A Network Coding Based Live P2P Media Streaming System With Rich User Experiences
Chen, Xiaogang,Ren, Ning,Zhang, Xiaochen,Wang, Xin,Zhao, Jin The Korea Institute of Information and Commucation 2008 Journal of communications and networks Vol.10 No.4
Recent studies have convinced that network coding can improve the performance of live media streaming in terms of startup delay, resilience to peer dynamics, as well as reduced bandwidth cost on dedicated streaming servers. However, there still exist some strategy drawbacks and neglected problems which need to be further researched. In addition to the commonly used evaluation parameters of the network and user experiences mentioned above, we focus on additional key factors, playback lag and switch lag, which have not been fully explored in previous work. In this paper, we present SonicStream, a novel and fully implemented live peer to peer (P2P) media streaming system with consideration of rich user experiences, including startup delay, playback continuity, playback lag, switch lag, etc. In pursuit of a further enhanced user experience, we revise traditional peer selection/data scheduling methods. Through a series of experimental evaluations and a cautious comparison with the latest similar work $R^2$, the superior performance of SonicStream has been preliminarily verified.
SonicStream: A Network Coding Based Live P2P Media Streaming SystemWith Rich User Experiences
Xiaogang Chen,Ning Ren,Xiaochen Zhang,Xin Wang,Jin Zhao 한국통신학회 2008 Journal of communications and networks Vol.10 No.4
Recent studies have convinced that network coding can improve the performance of live media streaming in terms of startup delay, resilience to peer dynamics, as well as reduced bandwidth cost on dedicated streaming servers. However, there still exist some strategy drawbacks and neglected problems which need to be further researched. In addition to the commonly used evaluation parameters of the network and user experiences mentioned above, we focus on additional key factors, playback lag and switch lag, which have not been fully explored in previous work. In this paper, we present SonicStream, a novel and fully implemented live peer to peer (P2P) media streaming system with consideration of rich user experiences, including startup delay, playback continuity, playback lag, switch lag, etc. In pursuit of a further enhanced user experience, we revise traditional peer selection/data scheduling methods. Through a series of experimental evaluations and a cautious comparison with the latest similar work R², the superior performance of SonicStream has been preliminarily verified.
Xiaogang Lu,Zhenghua Lin,Peng Pan,Yunbo Chen,Lingli Zuo,Chunming Li 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.6
WC-10Co-4Cr have been well known material with attractive corrosion resistance and excellent hardness in the WC-basedcoatings. To widen the application of the WC-10Co-4Cr coatings deposited on high-hardness metal cutting tools, theinvestigation of its preparation parameters and properties are required. In this study, dense micro-structured WC-10Co-4Crcoatings deposited on high-hardness M42 steel were performed with high velocity oxy-fuel (HVOF) spray process. Theprepared coatings exhibit excellent properties by improving the size of spray gun and injecting high flow nitrogen into theflame stream. A maximum micro-hardness of 1353.3 HV0.3 was achieved. In addition, the frictional properties of uncoated M42steel and the WC-10Co-4Cr coating were comparably studied under dry sliding wear tests. A low friction coefficient of 0.34-0.37 was achieved for WC-10Co-4Cr coating, showing a 57% decrease than that of uncoated M42 steel. X-ray diffractometrywas used to identify the phase composition, and scanning electron microscopy was adopted to characterize the microstructureof deposited coatings and worn-out surfaces.
Sunfang Chen,Dan Cai,Qi Dong,Gaoxiang Ma,Chennan Xu,Xiaogang Ba,Wei Yuan,Bing Wu,Bin Fang 한국생체재료학회 2023 생체재료학회지 Vol.27 No.00
Background The reconstruction of tendons with large defects requires grafts with high mechanical strength and is often hindered by complications such as infection and adhesion. Hence, grafts combining the advantages of mechanical resilience and antibacterial/antiadhesion activity are highly sought after. Methods The silver nanoparticles (GA-Ag NPs) synthesized from gallic acid and silver nitrate were attached to a decellularized extracellular matrix (Decellularized Tendon crosslinking GA-AgNPs, DT-Ag). We examined the histological structure, mechanical property, morphology, Zeta potential, cytotoxicity, antibacterial properties, antioxidant and anti-inflammatory properties, and ability of the DT-Ag to treat tendon defects in animals. Results Approximately 108.57 ± 0.94 μg GA-Ag NPs loaded per 50 mg DT, the cross-linked part of GA-Ag NPs was 65.47 ± 0.57%, which provided DT-Ag with long-lasting antibacterial activity. Meanwhile, GA endowed DT-Ag with good antioxidant and anti-inflammatory activities. Additionally, The DT-Ag facilitated M2 macrophage polarization, and suppressed fibrin deposition by hindering fibroblast adhesion. Mormore, the main advantages of DT-Ag, namely its long-lasting antibacterial activity (tested using Escherichia coli and Staphylococcus aureus as models) and the ability to prevent tissue adhesion were confirmed in vivo. Conclusion The fabricated multifunctional tendon graft was highly hydrophilic, biocompatible, and mechanically resilient, and concluded to be well suited for dealing with the main complications of surgical tendon reconstruction and has bright application prospects.