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RISS 인기검색어
- 검색키워드
- 저자 : He Xiyue (검색결과 5 건)
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Preparation and properties of Nd-doped BCTH lead-free ceramics by solid-phase twin crystal method
He Xiyue,Fang Bijun,Zhang Shuai,Lu Xiaolong,Ding Jianning 한국물리학회 2022 Current Applied Physics Vol.38 No.-
0.5 mol% Nd-doped (Ba0.85Ca0.15)(Ti0.9Hf0.1)O3 (BCTH-Nd) lead-free ceramics were prepared by a solid-phase twin crystal method, where the effects of sintering condition on structure, electrical and optical properties were studied. All the sintered BCTH-Nd ceramics exhibit pure perovskite structure, dense microstructure with several micron grain size, which tends to increase with elevating sintering temperature. All synthesized ceramics have complex dielectric behavior, which presents normal ferroelectrics characteristic with slight dispersion phenomenon. The BCTH-Nd ceramics exhibit excellent piezoelectric and ferroelectric properties and acceptable dielectric performance when sintered at 1480 ◦C for 2 h. Under 269 nm light excitation, several fluorescent emission peaks are excited with a whole indigo fluorescence, where the strongest emission peak is emitted at 473 nm, corresponding to the 4G3/2 → 4I9/2 energy level transition of Nd3+. Multifunctional performance is fulfilled in the lead-free BCTH ceramics via rare earth doping, which can broaden the application fields of piezoelectricbased materials.
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Dynamic Response of High Strength Steel Beams Subjected to Explosion Induced Blast Load
Xinchang Feng,Xiyue Liu,Zhiyang He,Shuxin Bai,Shun Li,Yu Tang 한국강구조학회 2023 International Journal of Steel Structures Vol.23 No.6
A series of anti-explosion tests were performed on H-type high strength steels (Q460JSC and HQ600) and ordinary steels (Q345B) to address the problem of anti-explosion in the technical application of high strength steel. The dynamic behavior of steel beams during explosion and the propagation of shock waves were analyzed. The effects of proportionate distance, steel strength, high-span ratio, section shapes were investigated. The finite element software (ANSYS/LS-DYNA) was used to analyze the anti-explosion performance of high strength steel beams. The finite element models which adopted modified Johnson–Cook constitutive model and damage criterion were validated by comparing with the experimental results. The influence factors of anti-explosion performance of high strength steel were explored by numerical simulation as well. The results reveal that under near-explosion conditions, the peak values of overpressure predicted by empirical formulas are often less than the experimental outcomes. As the scaled distance reduces, the damage to the steel beam increases, making it more prone to local fracture. By decreasing the scaled distance, increasing the high-span ratio, and strengthening the constraint of H-type steel beam, the deformation and damage of steel beams can reduce. The results provide an effective basis to evaluate the safety of high strength steel beams applied in practical engineering when subjected to explosion.
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Somatic cell reprogrammed by oocyte: process and barricade
LiBing Ma,XiaoYing He,FengMei Wang,Teng Cheng,XiYu Liu 한국통합생물학회 2014 Animal cells and systems Vol.18 No.3
Somatic cell nuclear transfer (SCNT) is a technology in which a somatic nucleus is transferred into thecytoplasm of a matured oocyte – reconstructed embryos have the capacity to develop to term. Why somaticcells can be reprogrammed by oocytes – the answer for this question must exist in the cytoplasm of maturedoocytes. In this review, totipotent characters of matured oocytes were discussed, which may confer maturedoocytes with the capacity to reprogram somatic nucleus. Moreover, the procedure of SCNT also makes apossibility for somatic nucleus to be reprogrammed by oocytes. Compared with fertilized embryos, embryosderived from SCNT exhibit low developmental ability; the barricades in reprogramming process and theirpossible reasons were also discussed. This review maybe can benefit the mechanism research of SCNTtechnology and can make contribution for improving the efficiency of this technology.
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Controlled fabrication and electrochemical corrosion behavior of ultrathin Ni-Cu alloy foil
Linping Yu,Long Chen,Qizhi Chen,Luli Feng,Ziyi Xu,Bo Nan,Xiyue Kang,Yuehui He 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.103 No.-
Cost-effective ultrathin alloy foils (<20 lm) are highly expected with the development of electronicindustry and micro-system technology. In this paper, electrodeposition combined with vacuum sinteringis used to fabricate a Ni-Cu alloy foil with thickness of 12.0 (±0.2) lm. For the ultrathin Ni-Cu alloy foil, adensified structure without pores can be achieved by prolonging sintering duration at 900 ℃ for 3 h. Under the current density of 10 mA cm 2, 700 s is the optimal electrodeposition time to obtain the highesttensile strength (187 MPa) with the Ni content of 41.5 wt.% in the alloy foil. Compared with Cu foil, Ni-Cu alloy foil shows superior corrosion resistance in 3.5 wt.% NaCl solution and also HCl solutions (0.5 mol/L, 1.0 mol/L, 2.0 mol/L), respectively. The uniform composition and defect-free surface, excellent tensilestrength and corrosion resistance together exhibits the great application potential of the obtained Ni-Cualloy foil, which may provide an inspiration for future development of integrated electronic or medicaldevices.
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