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| 1 | A ZnO thin-film driven microcantilever for nanoscale actuation and sensing显示文摘Zinc oxide(ZnO)thin film as a piezoelectric material for microelectromechanical system(MEMS)actuators and sensors was evaluated.ZnO thin films were deposited using radio frequency(RF)magnetron sputtering.Process parameters such as gas ratio,working pressure,and RF power were optimized for crystalline structure.The ZnO thin films were characterized by X-ray diffraction(XRD)and scanning electron microscopy(SEM).Good quality of ZnO thin films was further confirmed by a high transverse piezoelectric coefficient d31.A microcantilever was then designed,fabricated,and characterized.Design formulas of resonant frequency,actuation,and sensing sensitivities were derived.The resonant frequency was determined by an impedance analyzer.Tip deflection on nanometer level was demonstrated with the cantilever used as an actuator.The actuation sensitivity was found to be 12.2 nm/V.As a sensor,the cantilever was calibrated against a reference accelerometer.The sensing sensitivity was characterized to be 46 mV/g.The characterization results were compared with design specifications.The differences were caused mainly by thickness control in etching.This study showed that ZnO is a promising piezoelectric material for MEMS actuators and sensors in terms of excellent process compatibility and good piezoelectric performance. | Yanhui Yuan Kun Shyong Chow Hejun Du Peihong Wang Mingsheng Zhang Shengkai Yu k Bo Liu | 2013 | International Journal of Smart and Nano Materials2013，4，2： | 2 |
| 2 | Oxidation behavior of TiAl/TiAl-SiC gradient coatings on gamma titanium aluminides 显示文摘 | Gong Shengkai Xu Huibin Yu Qihui | 2000 | Surf Coat Techn2000，130，1： | 1 |
| 3 | Energy analysis on flying stability of sub-5-nm air bearing slider 显示文摘 | Hua Wei Liu Bo Yu Shengkai | 2009 | IEEE Transactions on Magnetics2009，45，11： | 1 |
| 4 | Oxidation behavior of TiAl/TiAl–SiC gradient coatings on gamma titanium aluminides显示文摘 | Shengkai Gong Huibin Xu Qihui Yu Chungen Zhou | 2000 | Surface & Coatings Technology2000，，1： | 1 |
| 5 | Flying height adjustment by slider's air bearing surface profile control显示文摘 | Zhang Mingsheng Yu Shengkai Liu Jin | 2005 | IEEE Journal of Applied Physics2005，97，10： | 1 |
| 6 | Femto slider:fabrication and evaluation显示文摘 | Liu Bo Zhang Mingsheng Yu Shengkai | 2003 | IEEE Transactions on Magnetics2003，39，2： | 1 |
| 7 | Surface recrystallization of a gamma-TiAl alloy induced by shot peening and subsequent annealing treatments显示文摘 | Wenyue Zhao Yuzhuo Liu Lei Liu Youxing Yu Yue Ma Shengkai Gong | 2013 | Applied Surface Science2013，，： | 1 |
| 8 | Interferon-beta inhibits human glioma stem cell growth by modulating immune response and cell cycle related signaling pathways显示文摘Malignant Glioma is characterized by strong self-renewal potential and immature differentiation potential.The main reason is that malignant glioma holds key cluster cells,glioma stem cells(GSCs).GSCs contribute to tumorigenesis,tumor progression,recurrence,and treatment resistance.Interferon-beta(IFN-β)is well known for its anti-proliferative efficacy in diverse cancers.IFN-βalso displayed potent antitumor effects in malignant glioma.IFN-βaffect both GSCs and Neural stem cells(NSCs)in the treatment of gliomas.However,the functional comparison,similar or different effects of IFN-βon GSCs and NSCs are rarely reported.Here,we studied the similarities and differences of the responses to IFN-βbetween human GSCs and normal NSCs.We found that IFN-βpreferentially inhibited GSCs over NSCs.The cell body and nucleus size of GSCs increased after IFN-βtreatment,and the genomic analysis revealed the enrichment of the upregulated immune response,cell adhesion genes and down regulated cell cycle,ribosome pathways.Several typical cyclin genes,including cyclin A2(CCNA2),cyclin B1(CCNB1),cyclin B2(CCNB2),and cyclin D1(CCND1),were significantly downregulated in GSCs after IFN-βstimulation.We also found that continuous IFN-βstimulation after passage further enhanced the inhibitory effect.Our study revealed how genetic diversity resulted in differential effects in response to IFN-βtreatment.These results may contribute to improve the applications of IFN-βin anti-cancer immunotherapy.In addition,these results may also help to design more effective pharmacological strategies to target cancer stem cells while protecting normal neural stem cells. | Xin-Xin Han Shengkai Jin Li-Ming Yu Min Wang Xin-Yu Hu Dai-Yu Hu Jie Ren Meng-Han Zhang Wei Huang Jia-Jia Deng Qing-Qing Chen Zhengliang Gao Hua He Chunhui Cai | 2022 | Cell Regeneration2022，11，1： | 0 |
| 9 | Weave geometry generation avoiding interferences for mesoscale RVEs显示文摘An algorithm which allows the generation of representative volume elements(RVEs) for complex woven and warp-interlaced fiber-reinforced composite topologies while avoiding unphysical tow intersections is presented. This is achieved by extending an existing RVE generation strategy in two significant ways:(1) the local cross section shape of the tow is adjusted depending on the local tow curvature in a way that preserves the cross sectional area of the tow, and(2) the elementary crimp interval is separated into a planar and a transition region. The modifications facilitate the generation of a wide range of elaborate textile topologies without tow intersections, which are present without the proposed modifications unless complex tow to tow contact models are introduced. The mechanical properties of plain weaves were predicted based on the topology generated with the proposed algorithm as well as based on RVEs which were constructed based on actual micrographs, i.e. a 'digital twin' of the actual microstructure. A comparison of the predicted mechanical properties based on finite element and Multiscale Generalized Method of Cells techniques shows close agreement. However, some differences exist with respect to experimentally determined material parameters due to the finite dimensions of the specimens. Lastly,mechanical properties of multilayered weaves are predicted with the finite element method. The considered material systems are carbon fiber in epoxy matrix as well as C/C-SiC. However, the procedure is applicable to a wide range of material systems. | Daniel Höwer Shengkai Yu Trenton M.Ricks Brett A.Bednarcyk Evan J.Pineda Bertram Stier Stefanie Reese Jaan-Willem Simon | 2019 | Journal of Materials Science & Technology2019，35，12： | 0 |
| 10 | Influence of Water Vapor on the Isothermal Oxidation Behavior of Thermal Barrier Coatings显示文摘The oxidation of specimens with thermal barrier coating (TBC) consisted of nickel-base superalloy, low-pressure plasma sprayed Ni-28Cr-6Al-0.4Y (wt pct) bond coating and electron beam physical vapor deposited 7.5 wt pct yttria stabilized zirconia (YSZ) top coating was studied at 1050℃ respectively in flows of O2, and mixture of O2 and 5%H2O under atmospheric pressure. The thermal barrier coating has relatively low oxidation rate at 1050℃ in pure O2. Oxidation rate of thermal barrier coating in the atmosphere of O2 and 5%H2O is increased The oxidation kinetics obeys almost linear law after long exposure time in the presence of 5% water vapor. Oxide formed along the interface between bond coat and top coat after oxidation at 1050℃ in pure O2 consisted of Al2O3, whereas interfacial scales formed after oxidation at 1050℃ in a mixture of O2 and 5%H2O were mainly composed of Ni(Al,Cr)2O4,NiO and Al2O3. It is suggested that the effect of water vapor on the oxidation of the NiCrAlY coating may be attributed to the increase in Ni and Cr ions transport in the oxides. | Chungen ZHOU, Jingsheng YU, Shengkai GONG and Huibin XUDepartment of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China | 2004 | Journal of Materials Science & Technology2004，20，1： | 0 |
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