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Xia Jinan,Beizhi Li,Xueping Zhang,Steven Y. Liang 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
Minimum quantity lubrication (MQL) machining has achieved noticeable attention in both academic and industry research areas dueto its minimum costs and maximum environmental protection. This paper focuses on the analysis of the effects of MQL parameterssuch as the flow rate of lubricant and the air-oil mixture ratio on cutting performances in terms of cutting force, cutting temperature,and residual stress. Additionally, the cutting performances in MQL machining are also compared with the dry and flood coolingmachining. The results show that the cutting fluid can considerably reduce the cutting force and cutting temperature in machining. For MQL machining, there is a maximum effective flow rate of lubricant and it is influenced by the cutting speed. When the flow rateof lubricant is beyond the maximum effective value, the air-oil mixture ratio will no longer affect the cutting performances inmachining. This research can support the process planning in achieving the desired residual stress profile by strategically adjustingthe MQL parameters.
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Man Zhao,Xia Jinan,Steven Y. Liang 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.20 No.11
This paper proposes a physical-based model to predict the temperature in the micro-grinding of maraging steel 3J33b with the consideration of material microstructure and process parameters. In micro-grinding, the effects of crystallography on the grinding machinability become significant, since the depth of cut is of the same order as the grain size. In this research, the Taylor factor model for multi-phase materials is proposed to quantify the crystallographic orientation (CO) with respect to the cutting direction by examining the number and type of activated slip systems. Then, the flow stress model is developed, in which both the athermal stress resulted from the COs and the strain induced by the phase transformation are taken into account. On the basis of the flow stress model, the grinding forces are predicted followed by the calculation of the grinding heat. In the investigation, the triangular heat flux distribution and the reported energy partition model are applied in the calculation of workpiece temperature. Furthermore, the temperature model is validated by conducting an orthogonal-designed experiment, with the predictions of the maximum temperature in good agreement with the experimental data. Moreover, the predictive data is compared with the predictions resulted from the two other previously reported models. The results indicate that the proposed temperature model with considering the effect of CO and the phase transformation improved the prediction accuracy of the micro-grinding temperature.
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Synthesis and Application of a Light-sensitive Polymer Forming Aqueous Two-phase Systems
Kong FanQi,Cao Xuejun,Xia Jinan,허병기 한국공업화학회 2007 Journal of Industrial and Engineering Chemistry Vol.13 No.3
Abstract:A visible light-sensitive polymer that forms aqueous two-phase systems has been synthesized by using N-isopropylacrylamide, n-butyl acrylate, and chlorophyllin sodium copper salt as monomers, and its capability to form aqueous two-phase system was investigated. The polymer formed aqueous two-phase systems with Dextran20000. Over 98 % of the polymer could be recovered by using light radiation at 488 nm. The recovery experiments were repeated five times. The recoveries were maintained fairly stable. The polymer could be recovered at more than 95 % by using thermo separation. Trypsin constantly maintained a relatively high activity and stability in the aqueous two-phase systems.
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일항 이,Beom Hoan O,Jinan Xia,Seung Gol Lee 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
We report the results of our investigation on the near-field and far-field distribution of the optical emission on in the design optimization of a 4 $\times$ 4 InGaAs/GaAs vertical-cavity surface-emitting laser (VCSEL) array. We examined the effect of the refractive index variation and the inter-element spacing on the near-field and far-field distribution of the optical emission modes in positive-index-guided VCSEL arrays, using numerical simulation. Our results demonstrate that a strong transverse-mode overlapping with poor inter-modal discrimination occurs in the near-field emission pattern of a VCSEL array for a small index-step and a small inter-element separation shorter than one wavelength. However, the modal discrimination can be improved in an array for a large refractive index step even if the array has a small inter-element separation. In addition, a stronger near field and a higher optical power can be obtained from positive-index-guided VCSEL arrays having a larger index-step under the conditions of other parameters being equal.
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