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Saw-Tooth Chip Formation and Its Effect on Cutting Force Fluctuation in Turning of Inconel 718
Song Zhan,Jianfeng Li,Xiaoli Zhu,Honggang Lv 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
Chip formation and its morphology are important features of metal cutting, and they can yield much more important information on the cutting operations. Meantime, the cutting forces are the most commonly used on-line indicators to monitor the cutting process. In this research, the formation of the saw-tooth chips has been investigated in association with the fluctuation of the cutting force components under different cutting parameters in turning of Inconel 718 with (Ti, Al)N/TiN coated cutting tools under dry cutting condition. By means of the optical microscopy and the scanning electron microscopy (SEM), the saw-tooth chips are observed at high cutting speeds, which directly cause the cutting force components to fluctuate. Based on the frequency analysis, the segmentation frequencies of the saw-tooth chips and the fluctuation frequency of the cutting forces are very close to each other. It indicates that the formation of the saw-tooth chips is one of the important factors leading to the periodical fluctuation of the cutting force components, even though the cutting parameters all keep constant in turning of Inconel 718.
Jianfeng Lu,Lina Qi,Wen Guo,Yishan Song,정용안,Yu‐dong Cheng,Yinzhe Jin 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.6
The concentration of fluoride in Antarctic krill (Euphausia superb) was investigated using a coaxial probe method based on dielectric properties in the 0.3–10 GHz frequency range. A quantitative relationship between the fluoride concentration in the aqueous solution and the dielectric loss at 0.3 GHz was also established with a regression coefficient over 0.98. The concentrations of fluoride in fresh and dried krill samples with different krill positions, such as shell and meat, were determined. The detected value agrees well with that determined using other methods, such as fluoride ion-selective electrode (ISE) and potassium permanganate titration (PPT). The fluoride concentrations in fresh krill were 0.0127, 0.0133, and 0.0152 mg/mL using dielectric spectroscopy, PPT, and ISE, respectively. These results show that the proposed dielectric loss technique is suitable and effective for determining fluoride content in Antarctic krill.
( Lanxiang Jiang ),( Hongen Li ),( Laiying Wang ),( Zexin Song ),( Lei Shi ),( Wenhua Li ),( Xuming Deng ),( Jianfeng Wang ) 한국미생물 · 생명공학회 2016 Journal of microbiology and biotechnology Vol.26 No.3
Staphylococcus aureus, like other gram-positive pathogens, has evolved a large repertoire of virulence factors as a powerful weapon to subvert the host immune system, among which alpha-hemolysin (Hla), a secreted pore-forming cytotoxin, plays a preeminent role. We observed a concentration-dependent reduction in Hla production by S. aureus in the presence of sub-inhibitory concentrations of isorhamnetin, a flavonoid from the fruits of Hippophae rhamnoides L., which has little antibacterial activity. We further evaluate the effect of isorhamnetin on the transcription of the Hla-encoding gene hla and RNAIII, an effector molecule in the agr system. Isorhamnetin significantly down-regulated RNAIII expression and subsequently inhibited hla transcription. In a co-culture of S. aureus and lung cells, topical isorhamnetin treatment protected against S. aureus-induced cell injury. Isorhamnetin may represent a leading compound for the development of anti-virulence drugs against S. aureus infections.
Tao Meng,Hongqi Ben,Daqing Wang,Jianfeng Song 전력전자학회 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.3
In this paper a novel passive snubber is proposed, which can suppress the voltage spike across the bridge leg of the isolated full-bridge boost topology. The snubber is composed of capacitors, inductors and diodes. Two capacitors connected in series are used to absorb the voltage spike and the energy of each capacitor can be transferred to the load during one switching cycle by the resonance of the inductors and capacitors. The operational principle of the passive snubber is analyzed in detail based on a three-phase power factor correction (PFC) converter, and the design considerations of both the converter and the snubber are given. Finally, a 3kW laboratory-made prototype is built. The experimental results verify the theoretical analysis and evaluations. They also prove the validity and feasibility of the proposed methods.
Meng, Tao,Ben, Hongqi,Wang, Daqing,Song, Jianfeng The Korean Institute of Power Electronics 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.3
In this paper a novel passive snubber is proposed, which can suppress the voltage spike across the bridge leg of the isolated full-bridge boost topology. The snubber is composed of capacitors, inductors and diodes. Two capacitors connected in series are used to absorb the voltage spike and the energy of each capacitor can be transferred to the load during one switching cycle by the resonance of the inductors and capacitors. The operational principle of the passive snubber is analyzed in detail based on a three-phase power factor correction (PFC) converter, and the design considerations of both the converter and the snubber are given. Finally, a 3kW laboratory-made prototype is built. The experimental results verify the theoretical analysis and evaluations. They also prove the validity and feasibility of the proposed methods.
ENERGY-SAVING MODEL PREDICTIVE CRUISE CONTROL COMBINED WITH VEHICLE DRIVING CYCLES
SiLun Peng,ZhiHao Xu,JianHua Li,Feng Xiao,Xu Zhang,ShiXin Song,Da Wang,ChunYang Qi,JianFeng Wang 한국자동차공학회 2022 International journal of automotive technology Vol.23 No.2
This study analyzes the problem of adaptive cruise control of vehicles in different driving cycles and divides diverse weight coefficient intervals for the vehicles under the different driving cycles to improve the adaptability of the vehicles in various environments. This paper first describes the driving environment of the adaptive cruise vehicle, and a model prediction algorithm with fixed weight coefficients is established to control the vehicle state. Then, a neural network is established to identify the vehicle driving cycles, the weight intervals are divided in accordance with different driving cycles, and the weight value is dynamically adjusted through fuzzy control. Lastly, the variable weight coefficients of different driving cycles are combined with the model prediction controller. The software cosimulation shows that the method designed in this paper plays a positive role in the fuel economy of adaptive cruise.