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| 1 | Influence of mechanical vibration on the solidification of a lost foam cast 356 alloy显示文摘Mechanical vibration was applied to the solidification of a lost foam cast(LFC) 356 aluminum alloy.Effects of mechanical vibration,with different peak acceleration,on the size and morphology of α-Al phase,and also on the mechanical properties of the castings were studied.Results indicated that α-Al dendrites gradually grow into equiaxed grains as the peak acceleration of vibration is increased.When the peak acceleration is between about 1 to 4 g,α-Al phase distribution is uniform and is refined obviously.α-Al dendrites are reduced and the mechanical properties of the castings are improved significantly when compared to those of the castings that are produced without vibration.However,when the peak acceleration is higher than 4 g,strong vibration will lead to defects formation,such as sand adhesion,while the amount and size of pores will be increased.And due to the turbulent flow that caused by strong vibration,the chance of forming large pores in the matrix has been increased significantly.The increase in defects will result in the deterioration of mechanical properties. | Zhao Zhong Fan Zitian Dong Xuanpu Tang Bo Pan Di Li Jiqiang | 2010 | China Foundry2010，7，1： | 7 |
| 2 | Ultraviolet irradiation induced oxidative stress and response of antioxidant system in an intertidal macroalgae Corallina officinalis L.显示文摘The response of the antioxidant defense system of an intertidal macroalgae Corallina officinalis L.to different dosages of UV-B irradiation was investigated.Results showed that superoxide dimutase (SOD) and peroxidase (POX) increased and then maintained at a relatively stable level when subjected to UV-B irradiation.Catalase (CAT) activity under medium dosage of UV-B irradiation (Muv) and high dosage of UV-B irradiation (Huv) treatments were significantly decreased.Ascorbate peroxidase (APX) activity first remained unaltered and then increased in Huv treatment.In addition,the assay on isozymes was carried out using non-denaturing polyacrylamide gel electrophoresis (PAGE).The activities of some SOD isoforms were altered by UV-B.Two new bands (POX V and POX VII) appeared upon exposure to all three UV-B dosages.CAT III activity was increased by low dosage of UV-B irradiation (Luv),whereas CAT III and CAT IV disappeared when the alga was exposed to Muv and Huv.Two bands of APX (APX VI and APX VII) were increased and a new band (APX X) was observed under Huv exposure.H 2 O 2 and thiobarbituric acid reacting substance (TBARS) increased under Muv and Huv treatments.Overall,UV-B protection mechanisms are partly inducible and to a certain extent sufficient to prevent the accumulation of damage in C.officinalis. | Lixia Li Jiqiang Zhao Xuexi Tang | 2010 | Journal of Environmental Sciences2010，22，5： | 5 |
| 3 | Large scale shaking table model test and analysis on seismic response of utility tunnel in non-homogeneous soil显示文摘Underground utility tunnels are the most fundamental and reliable lifeline network in urban cities,and are widely constructed throughout the world.In urban areas,most utility tunnels usually encounter the non-homogeneity of subsoil condition due to various construction effects.Studies have shown that the damage mechanism of shallow underground structures mainly depends on the inhomogeneity of the subsoil conditions.This would become a considerable factor for the stability of the underground utility tunnel structures.However,this type of research still needs to establish the vulnerable seismic design.In this study,a series of shaking table tests were conducted on non-homogenous soils to investigate the performance of seismic interaction between utility tunnels,surrounding soils and interior pipelines.The dynamic responses measured from the test account for the boundary condition of non-homogeneous soils,the internal forces,displacement of tunnel joints,the dynamic characteristics on interior pipelines and the reasonable spring stiffness with damping in the seismically isolated gas pipeline model inside the tunnel.The vulnerability of underground utility tunnel in non-homogeneous soil zone and the mechanism of the stability of interior facilities are the main topics discussed in this paper. | Cho Mya Darli Tang Aiping Huang Delong Zhang Jiqiang | 2021 | Earthquake Engineering and Engineering Vibration2021，20，2： | 5 |
| 4 | A Comparative Study on Hydrodynamic Performance of Double Deflector Rectangular Cambered Otter Board显示文摘In the present work,the hydrodynamic performance of the double deflector rectangular cambered otter board was studied using wind tunnel experiment,flume tank experiment and numerical simulation.Results showed that the otter board had a good hydrodynamic performance with the maximum lift-to-drag ratio(K_(MAX) = 3.70).The flow separation occurred when the angle of attack(AOA) was at 45?,which revealed that the double deflector structure of the otter board can delay the flow separation.Numerical simulation results showed a good agreement with experiment ones,and could predict the critical AOA,which showed that it can be used to study the hydrodynamic performance of the otter board with the advantage of flow visualization.However,the drag coefficient in flume tank was much higher than that in wind tunnel,which resulted in a lower lift-to-drag ratio.These may be due to different fluid media between flume tank and wind tunnel,which result in the big difference of the vortexes around the otter board.Given the otter boards are operated in water,it was suggested to apply both flume tank experiment and numerical simulation to study the hydrodynamic performance of otter board. | XU Qingchang FENG Chunlei HUANG Liuyi XU Jiqiang WANG Lei ZHANG Xun LIANG Zhenlin TANG Yanli ZHAO Fenfang WANG Xinxin | 2018 | Journal of Ocean University of China2018，17，5： | 5 |
| 5 | Microstructure and bioactivity of a cold sprayed rough/porous Ta coating on Ti6Al4V substrate显示文摘To improve the bioactivity and biocompatibility of titanium implants,a rough/porous tantalum(Ta)coating was firstly prepared on Ti6Al4V substrate by cold spraying.The results indicated that the surface of Ta coating is extremely rough with lots of visible holes,because of poor deposition quality.Microstructure and microhardness results showed that different layers appeared in the inner and outer parts of coatings,corresponding to porosity,due to lack of subsequent compaction.The simulated body fluid(SBF)soaking test showed that spherical apatite sediments were mineralized on rough/porous surface in SBF after 2–4 weeks,which demonstrated that the cold sprayed Ta coating had good bioactivity.This was mainly attributed to the rough/porous surface of Ta coating obtained by cold spraying,which is conducive to the heterogeneous nucleation of apatite on it. | TANG JunRong ZHAO ZhiPo CUI XinYu WANG JiQiang XIONG TianYing | 2020 | Science China(Technological Sciences)2020，63，5： | 3 |
| 6 | Roles of superconducting magnetic bearings and active magnetic bearings in attitude control and energy storage flywheel显示文摘 | Tang Jiqiang Fang Jiancheng Ge S S | 2012 | Physica C2012，483，： | 1 |
| 7 | Microstructure and Mechanical Properties of Ti–Ta Composites Prepared Through Cold Spray Additive Manufacturing显示文摘In this study, an innovative approach was used to fabricate Ti–Ta composite biomaterials through cold spray additive manufacturing followed by a diff usion treatment. The microstructure and mechanical properties of the composites were investigated in detail using field emission scanning electron microscopy, electron backscatter diff raction, 3D X-ray computed tomography, tensile test, nanohardness test and resonance vibration test. The obtained results indicated that the prepared composites have inhomogeneity in their microstructure and composition. A unique microstructure, composed of Ti-rich, Ta-rich and diff usion regions, was evolved in the composites due to incomplete diff usion between Ti and Ta splats. Further, Kirkendall pores were formed in the composites due to uneven diff usion of the two phases(of Ti and Ta) during high-temperature heat treatment. The prepared composites simultaneously showed low elastic modulus and high tensile strength which is required for a good biomaterial. Low elastic modulus was associated with the residual pores and the alloying eff ect of Ta in Ti, while high tensile strength was related to the solid solution strengthening eff ects. The obtained results indicated that the prepared Ti–Ta composites have a great potential to become a new candidate for biomedical applications. | Junrong Tang Naeem ul Haq Tariq Zhipo Zhao Mingxiao Guo Hanhui Liu Yupeng Ren Xinyu Cui Yanfang Shen Jiqiang Wang Tianying Xiong | 2022 | Acta Metallurgica Sinica(English Letters)2022，35，9： | 1 |
| 8 | Hollow interference fitted multi-ring composite rotor of the superconducting attitude control and energy storage flywheel显示文摘 | Tang Jiqiang Zhang Yongbin Ge Shuzhi | 2013 | Journal of Reinforced Plastics and Composites2013，32，12： | 1 |
| 9 | Roles of superconduct- ing magnetic bearings and active magnetic bearings in attitude control and energy storage flywheel显示文摘 | Jiqiang Tang Jiancheng Fang Shuzhi Sam Ge | 2012 | Physica C: Superconductivity2012，483，： | 1 |
| 10 | Hybrid optical parametrically-oscillating emitter at 1930 nm for volumetric photoacoustic imaging of water content显示文摘Water plays a vital role in biological metabolism and it would be essential to trace the water content non-invasively,such as leveraging the vibrational absorption peak of the O-H bond.However,due to the lack of an efficient laser source,it was challenging to image the water content in the deep tissue with micron-level spatial resolution.To address this problem,we develop a high-power hybrid optical parametrically-oscillating emitter(HOPE)at 1930 nm,at which the vibrational absorption peak of the O-H bond locates.The maximum pulse energy is over 1.74μJ with a pulse repetition rate of 50 kHz and a pulse width of 15 ns.We employ this laser source in the optical-resolution photoacoustic microscopy(OR-PAM)system to image the water content in the phantom and the biological tissue in vitro.Our 1930-nm OR-PAM could map the water content in the complex tissue environment at high spatial resolution,deep penetration depth,improved sensitivity,and suppressed artifact signal of the lipid. | Jiawei Shi Mingsheng Li Huajun Tang Jiqiang Kang Najia Sharmin Amir Rosenthal Kenneth K.Y.Wong | 2022 | eLight2022，2，1： | 1 |
| 11 | Research on the Influence Degree and Effect of Support on Innovation Incentives for R&D Personnel in Micro and Small Enterprises:An Empirical Study based on the China Micro and Small Enterprise Survey(CMES)显示文摘In this study,the influence degree and effect of support on innovation incentives for research and development(R&D)personnel in micro and small enterprises(MSEs)were explored based on the CMES data.We found that government support will increase the R&D wage and widen the gap between R&D wage and staff wage,especially for small,non-high-tech enterprises with strict financing constraints.Furthermore,taking the wage gap as a mediator,we concluded that support would widen the wage gap and increase management innovation rather than technological innovation in MSEs because the wage premium of R&D personnel is the main driver for the increase of management innovation.The findings of this study provide useful enlightenment for China to implement an innovation-driven strategy and build an innovative country. | Xiong Yang Li Haojun Tang Jiqiang | 2022 | Contemporary Social Sciences2022，7，5： | 0 |
| 12 | Dynamic Stiffness Analysis and Experimental Verification of Axial Magnetic Bearing Based on Air Gap Flux Variation in Magnetically Suspended Molecular Pump显示文摘Current and displacement stiffness are important parameters of axial magnetic bearing(AMB)and are usually considered as constants for the control system.However,in actual dynamic work situations,time-varying force leads to time-varying currents and air gap with a specific frequency,which makes the stiffness of appear decrease and even worsens control performance for the whole system.In this paper,an AMB dynamic stiffness model considering the flux variation across the air gap due to frequency is established to obtain the accurate dynamic stiffness.The dynamic stiffness characteristics are analyzed by means of the dynamic equivalent magnetic circuit method.The analytical results show that the amplitude of current and displacement stiffness decreases with frequency increasing.Moreover,compared with the stiffness model without considering the variation of flux density across the air gap,the improved dynamic stiffness results are closer to the actual results.Through the dynamic stiffness measurement method of AMB,experiments of AMB in magnetically suspended molecular pump(MSMP)are carried out and the experimental results are consistent with theoretical analysis results.This paper proposes the dynamic stiffness model of axial magnetic bearing considering the variation of flux density across the air gap,which improves the accuracy of the AMB stiffness analysis. | Jinji Sun Wanting Wei Jiqiang Tang Chun‑E Wang | 2020 | Chinese Journal of Mechanical Engineering2020，33，4： | 0 |
| 13 | High-excited-state splitting and multimode vibrational coupling in Mn^(4+)-activated fluoride phosphor显示文摘Excited-states play a crucial role in the optical absorption and luminescence of solids and hence their accurate information is highly desired. Herein, we attempt to seize the excited-states information of Mn^(4+)ions in K_(2)SiF_(6) microcrystals via measuring and calculating their variable-temperature photoluminescence excitation(PLE) spectra. At cryogenic temperatures, an unpredicted splitting of the high-excited-state is observed. Moreover, the two-split high-excited-state levels are further revealed to primarily couple with the two hyperfine split modes of quasi-localized ν2 vibration in the distorted Mn-F_(6) octahedral configuration,whereas the coupling strengths are found to be substantially different from each other. The slightly split vibrational mode is firmly supported by the low-temperature Raman spectra. Jahn-Teller lattice distortion is believed to be responsible for the observed splitting of the electronic high-excited-state and the quasi-localized vibrational mode. | Debao Zhang Wanggui Ye Xuguang Cao Ji Zhou Fei Tang Changcheng Zheng Jiqiang Ning Shijie Xu | 2024 | Science China(Physics,Mechanics & Astronomy)2024，67，3： | 0 |
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