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      • SCIESCOPUSKCI등재

        Effects of Precipitate Element Addition on Microstructure and Magnetic Properties in Magnetostrictive Fe<SUB>83</SUB>Ga<SUB>17</SUB> alloy

        Jiheng Li,Chao Yuan,Wenlan Zhang,Xiaoqian Bao,Xuexu Gao 한국자기학회 2016 Journal of Magnetics Vol.21 No.1

        The 〈100〉 oriented Fe83Ga17 alloys with various contents of NbC or B were prepared by directionally solidification method at the growth rate of 720 ㎜·h<SUP>−1</SUP>. With a small amount of precipitates, the columnar grains grew with cellular mode during directional solidification process, while like-dendrite mode of grains growth was observed in the alloys with higher contents of 0.5 at% due to the dragging effect of precipitates on the boundaries. The NbC precipitates disperse both inside grains and along the boundaries of Fe83Ga17 alloys with NbC addition, and the Fe₂B secondary phase particles preferentially distribute along the grain boundaries in B-doped alloys. Precipitates could affect grain growth and improved the 〈100〉 orientation during directional solidification process. Small amount of precipitate element addition slightly increased the magnetostrictive strain, and a high value of 335 ppm under pre-stress of 15 ㎫ was achieved in the alloys with 0.1 at% NbC. Despite the fact that the effect on magnetic induction density of small amount of precipitates could be negligible, the coercivity markedly increased with addition of precipitate element for Fe83Ga17 alloy due to the retarded domain motion resulted by precipitates.

      • KCI등재

        Effects of NaCl on the rheological behavior of collagen solution

        Lian Duan,Jiheng Li,Conghu Li,Guoying Li 한국유변학회 2013 Korea-Australia rheology journal Vol.25 No.3

        The effects of NaCl on the rheological properties of collagen solutions were studied by steady shear test and thixotropic loop test. The results showed the rheological properties of the collagen solutions with different NaCl concentrations were quite different. With low NaCl concentrations (0 to 0.1 mol/L), the collagen solutions exhibited salting in effect. The pseudoplastic behavior of the solutions became weak, while the thixotropy became strong. The collagen solutions with high NaCl concentrations (0.1 to 0.3 mol/L) exhibited salting out effect. The pseudoplastic behavior of the solutions became strong and the thixotropy had no obvious variation. In addition, Ostwald de-waele model, Carreau model and Herschel-Bulkley model were used to fit the experimental data. The superimposed experimental data and the model curves indicated the suitability of the models used, except for the up curves in thixotropic loop test.

      • SCIESCOPUSKCI등재

        Effects of NaCl on the rheological behavior of collagen solution

        Duan, Lian,Li, Jiheng,Li, Conghu,Li, Guoying 한국유변학회 2013 Korea-Australia rheology journal Vol.25 No.3

        The effects of NaCl on the rheological properties of collagen solutions were studied by steady shear test and thixotropic loop test. The results showed the rheological properties of the collagen solutions with different NaCl concentrations were quite different. With low NaCl concentrations (0 to 0.1 mol/L), the collagen solutions exhibited salting in effect. The pseudoplastic behavior of the solutions became weak, while the thixotropy became strong. The collagen solutions with high NaCl concentrations (0.1 to 0.3 mol/L) exhibited salting out effect. The pseudoplastic behavior of the solutions became strong and the thixotropy had no obvious variation. In addition, Ostwald de-waele model, Carreau model and Herschel-Bulkley model were used to fit the experimental data. The superimposed experimental data and the model curves indicated the suitability of the models used, except for the up curves in thixotropic loop test.

      • KCI등재

        Comparison of Unilateral Biportal Endoscopy Decompression and Microscopic Decompression Effectiveness in Lumbar Spinal Stenosis Treatment: A Systematic Review and Meta-analysis

        Junjie Li,Jiheng Yin,Jun Liu,haixiong Lin,Haifeng Yuan 대한척추외과학회 2023 Asian Spine Journal Vol.17 No.2

        This study aimed to compare the safety and effectiveness between unilateral biportal endoscopy (UBE) technique and microscopic decompression (MD) technique in lumbar spinal stenosis treatment. PubMed, Cochrane Library, Embase, Web of Science, China National Knowledge Infrastructure, and other databases were used to conduct extensive literature searches. RevMan ver. 5.3 software was used for the statistical analysis. Eleven studies were included with 930 patients, including 449 patients in the UBE group and 521 in the MD group. Both techniques revealed similar operative times at −1.77 minutes (95% confidence interval [CI], −7.59 to 4.05 minutes; p =0.55), the postoperative dural expansion area at −1.27 (95% CI, −19.30 to 16.77; p =0.89), the postoperative complications at 0.76 (95% CI, 0.47 to 1.22; p =0.26), the preoperative Visual Analog Scale (VAS) for leg pain, and the last follow-up (>12 months) VAS for leg pain at −0.04 (95% CI, −0.14 to 0.06; p =0.47), the preoperative Oswestry Disability Index (ODI), and the last follow-up (>12 months) ODI scores at −0.18 (95% CI, −0.76 to 0.40; p =0.54), and patient satisfaction (the modified MacNab score) at 1.15 (95% CI, 0.54 to 2.42; p =0.72). However, intraoperative bleeding was lower following the UBE technique at −52.78 mL (95% CI, −93.47 to −12.08 mL; p =0.01) and was shorter following the UBE technique at −3.06 (95% CI, −3.84 to −2.28; p <0.01). UBE and MD technology have no significant differences in efficacy or safety in the treatment of patients with lumbar spinal stenosis based on this meta-analysis. However, the UBE technique has less intraoperative bleeding and a shorter hospital stay. It has a slight advantage and is a better surgical option than the MD technique. It can be an alternative minimally invasive spinal surgery method.

      • KCI등재

        Novel fuzzy direct torque control based on constructed functional transformed grey model

        Zhao, Wei,Li, Zhizhong,Xu, Jiheng,Zhang, Haitao,Yuan, Yuan The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.6

        To reduce the ripple of the magnetic flux and torque of motors and the reduce the hysteresis in motor speed control, an improved grey model predictive fuzzy direct torque control (DTC) method based on function transformation is proposed. First, a function transformation is used to transform the sampled sequences to nonnegative values. This overcomes the disadvantages caused by fluctuant and random sampling of the motor torque and stator flux linkage. Second, an equal dimensional new information model is used to keep the dimensions unchanged, which reduces the time to predict the motor parameters through the model. Moreover, the voltage space vector plane is divided into six sectors, which simplifies the fuzzy control system rules. Simulation results show that the proposed fuzzy direct torque control based on the improved grey model method reduces the influence of hysteresis on the control system, decreases the motor flux chain and torque ripple, improves the response speed of the torque and rotational speed, reduces overshoot, achieves good effects in terms of anti-interference capability and dynamic response, and improves the real-time performance and accuracy of the fuzzy control system.

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