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Search Results: 1 - 10 of 104203 matches for " Feihu Zhang "
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Research on Ride Comfort Model of Wheel Motor Driving Vehicle Based on Matlab/Simulink  [PDF]
Wenwen Xiao, Feihu Xuan, Huanghuang Zhang
Engineering (ENG) , 2017, DOI: 10.4236/eng.2017.911057
Abstract: Simulink is a visual simulation tool in MATLAB;?through Simulink software,?to establish a model can reduce the amount of programming workload,?and?improve the efficiency of the establishment of automotive models.The ride comfort of the vehicle is a measure of the most basic indicators of a car performance.By establishing a ride comfort model in Matlab/Simulink, the wheel motor electric vehicle mainly affects the smoothness of the car mainly in the following aspects:?pavement, tire, suspension, motor and so on.Through the establishment of the above model,we?can effectively study the wheel motor drive electric vehicle ride comfort research.
Multiple Vehicle Cooperative Localization with Spatial Registration Based on a Probability Hypothesis Density Filter
Feihu Zhang,Christian Buckl,Alois Knoll
Sensors , 2014, DOI: 10.3390/s140100995
Abstract: This paper studies the problem of multiple vehicle cooperative localization with spatial registration in the formulation of the probability hypothesis density (PHD) filter. Assuming vehicles are equipped with proprioceptive and exteroceptive sensors (with biases) to cooperatively localize positions, a simultaneous solution for joint spatial registration and state estimation is proposed. For this, we rely on the sequential Monte Carlo implementation of the PHD filtering. Compared to other methods, the concept of multiple vehicle cooperative localization with spatial registration is first proposed under Random Finite Set Theory. In addition, the proposed solution also addresses the challenges for multiple vehicle cooperative localization, e.g., the communication bandwidth issue and data association uncertainty. The simulation result demonstrates its reliability and feasibility in large-scale environments.
Study on Braking Energy Recovery of Four Wheel Drive Electric Vehicle Based on Driving Intention Recognition  [PDF]
Feihu Xuan, Huanhuan Zhang, Wenwen Xiao
Open Access Library Journal (OALib Journal) , 2018, DOI: 10.4236/oalib.1104295
To judge the driver’s driving intention can effectively improve the car braking energy recovery. Aiming at the problem of braking energy recovery of four wheel drives electric vehicle, combined with the main restrictive conditions of ECE regulations, motor characteristics and battery SOC, a braking force distribution strategy for different braking intention is established. The MATLAB/ Simulink platform is used for modeling and simulation to verify the effectiveness of the braking energy recovery strategy, and verify the compliance of the braking strategy through the braking distance under the initial braking speed specified in the national standard. The results show that the fuzzy recognition model can accurately identify the various brake driving intentions, according to different driving intention under the brake, braking force distribution strategy are established, which is effective in the initial braking speed under different braking distance is also in line with national standards.
Carriage Error Identification Based on Cross-Correlation Analysis and Wavelet Transformation
Donghui Mu,Dongju Chen,Jinwei Fan,Xiaofeng Wang,Feihu Zhang
Sensors , 2012, DOI: 10.3390/s120709551
Abstract: This paper proposes a novel method for identifying carriage errors. A general mathematical model of a guideway system is developed, based on the multi-body system method. Based on the proposed model, most error sources in the guideway system can be measured. The flatness of a workpiece measured by the PGI1240 profilometer is represented by a wavelet. Cross-correlation analysis performed to identify the error source of the carriage. The error model is developed based on experimental results on the low frequency components of the signals. With the use of wavelets, the identification precision of test signals is very high.
Characteristics of Gas Exchange in Three Domesticated Anemone Species  [PDF]
Feihu Liu, Fei Li, Xueni Liang
American Journal of Plant Sciences (AJPS) , 2010, DOI: 10.4236/ajps.2010.11007
Abstract: Seeds of three Anemone species were collected from the suburban areas of Kunming and planted in a nursery for three and a half years at Kunming, Yunnan Province, China. Leaf gas exchange measurement indicated that these species had similar one-peak diurnal trends of net photosynthetic rate (PN), although A. rivularis had lower transpiration rate (TR), stomatal conductance (gs) and intercellular CO2 concentration (Ci), and higher stomatal limit in the afternoon. Species differences in response of PN to photosynthetically active radiation (PAR) were observed, especially under strong light. A. rivularis had the highest PN and Ci under strong light which corresponded with its highest gs and TR. A. rivularis had the highest light saturation point (LSP) (1000 mol m-2 s-1) and light compensation point (LCP) (69 mol m-2 s-1), while A. hupehensis var. japonica had the lowest LSP (800 ?mol m-2 s-1) and a lower LCP (53 mol m-2 s-1). But the three species responded similarly to the change of CO2 concentration in the air from 0 to 350 ?mol (CO2) mol-1, and their observed CO2 compensation point showed little difference (47, 53 and 56 ?mol (CO2) mol-1). Moreover, A. rivularis had the highest apparent quantum yield (0.032), carboxylation efficiency (0.049), PN (11.68 ?mol (CO2) m-2 s-1) and TR (5.36 mmol (H2O) m-2 s-1) based on the PN -PAR response. The results implied that A. rivularis is able to grow well under higher radiation, while A. hupehensis var. japonica is the best one to grow under partial shade.
Thermodynamic Simulation of CCP in Air-Cooled Heat Pump Unit with HFCs and CO2 Trans-Critical  [PDF]
Feihu Chen, Shuguang Liao, Guangcai Gong
Journal of Power and Energy Engineering (JPEE) , 2018, DOI: 10.4236/jpee.2018.69012
Abstract: The exergy analysis and finite time thermodynamic methods had been employed to analyze the compound condensation process (CCP). It was based on the air-cooling heat pump unit. The cooling capacity of the chiller unit is about 1 kW, and the work refrigerant is R22/R407C/R410A/CO2. The MATLAB/SIMULINK software was employed to build the simulation model. The thermodynamic simulation model is significant for the optimization of parameters of the unit, such as condensation and evaporation temperature and mass flow of the sanitary hot water and size of hot water storage tank. The COP of the CCP of R410A system is about 3% - 5% higher than the CCP of the R22 system, while CCP of the R407C system is a little lower than the CCP of R22 system. And the CCP of CO2 trans-critical system has advantage in the hot supply mode. The simulation method provided a theoretical reference for developing the production of CCP with substitute refrigerant R407C/R410A/CO2.
Identification of significant pathways in gastric cancer based on protein-protein interaction networks and cluster analysis
Hu, Kongwang;Chen, Feihu;
Genetics and Molecular Biology , 2012, DOI: 10.1590/S1415-47572012005000045
Abstract: gastric cancer is one of the most common and lethal cancers worldwide. however, despite its clinical importance, the regulatory mechanisms involved in the aggressiveness of this cancer are still poorly understood. a better understanding of the biology, genetics and molecular mechanisms of gastric cancer would be useful in developing novel targeted approaches for treating this disease. in this study we used protein-protein interaction networks and cluster analysis to comprehensively investigate the cellular pathways involved in gastric cancer. a primary immunodeficiency pathway, focal adhesion, ecm-receptor interactions and the metabolism of xenobiotics by cytochrome p450 were identified as four important pathways associated with the progression of gastric cancer. the genes in these pathways, e.g., zap70, igll1, cd79a, col6a3, col3a1, col1a1, cyp2c18 and cyp2c9, may be considered as potential therapeutic targets for gastric cancer.
Study on application of water-quenched slag in rare-earth ammonia-nitrogen wastewater

Chen Lirong,Jia Feihu,Zhang Lianke,Meng Xin,

环境工程学报 , 2011,
Abstract: 研究了水淬渣原渣和铁改性水淬渣作为吸附剂处理稀土氨氮废水的工艺条件和吸附机理,实验表明,原渣和改性渣处理稀土氨氮废水的最佳反应时间都为60 min,原渣的最佳投加量为0.015 g/mL,而改性渣的最佳投加量为0.01 g/mL,原渣的氨氮去除率为(59.9±2.49)%,而改性渣的氨氮去除率为(79.24±1.21)%。原水淬渣对氨氮的吸附符合Freundlich等温方程,以物理吸附为主,而改性水淬渣对氨氮的吸附符合Temkin等温方程,以化学吸附为主。
Balanced Fertilization Improves Fiber Yield and Quality of Winter Flax (Linum usitatissimum L.)  [PDF]
Feihu Liu, Fei Li, Guanghui Du, Fu Xiao
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.42038
Abstract: Winter fiber flax has been planted in a large area in Yunnan Province, the southwestern part of China, and other areas of the world, but little is known about the influence of fertilization on the fiber yield and quality. For that, a two-factor experiment in random block designed was carried out by specifying nitrogen (N), phosphorus (P) and potassium (K) as factor A, boron (B), manganese (Mn), copper (Cu), zinc (Zn) and molybdenum (Mo) as factor B each in four levels and their complete combinations. With the increase of N, P and K fertilizers, the yields of long-fiber and total-fiber obviously increased resulting from the increased straw yield, although the portion of retted-stem in straw, contents of longfiber and total-fiber decreased. The fiber tensile strength and flexibility increased as well. The micronutrients application increased the yields of straw, long-fiber and total-fiber, but gave no influence to fiber content and the fiber qualities. Combinations of the macronutrients and micronutrients gave obvious influences to the yields of straw and fiber, contents of long-fiber and total-fiber, fiber fineness and tensile strength, but little influence to the fiber flexibility. The fertilizers formula A2B2, i.e. N-P2O5-K2O 172.8, 28.8 172.8 kg/hm2, Zn-Cu-B-M-Mo 2363, 1654, 236, 2363,165 g/hm2, was the best, yielding most in the straw, long-fiber and total-fiber, with synchronous improvement of the three quality indices.
Influence of nano-TiO2 doped low density polyethylene on space charge behavior

GONG Bin,ZHANG Yewen,ZHENG Feihu,ZHU Jianwei,WU Changshun,

材料研究学报 , 2005,
Abstract: The space charge evolution and the isothermal decay for low density polyethylene (LDPE) with/without 0.5%(mass fraction) nano-TiO2 doping were investigated by using of the pulsed wave propagation (PWP) method. With infrared (IR) absorption, scanning electronic microscopy (SEM) and thermally stimulated current (TSC), we also discussed the morphology and the trap levels of the nano-TiO2 doped LDPE in this paper. The results indicate that the doping of nano-TiO2 has changed the injection and accumulation of space charge, the fine microstructure has made the trap levels deepened, which may prevent the inducement and the development of the electric trees in high-voltage cables of polyethylene.
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