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| 1 | Extension of continuous scanning laser Doppler vibrometry measurement for complex structures with curved surfaces显示文摘The continuous Scanning Laser Doppler Vibrometry(SLDV)developed on the base of the galvanometer scanner system has made it possible to quickly obtain the full field vibration responses within a rectangular area of the structure.In this paper,an arbitrary continuous scanning path generating method for Continuous Scanning Laser Doppler Vibometry(CSLDV)is further put forward in order to allow the CSLDV suitable for testing structures featured by complex shapes not just for regular areas.In the first step,the relationship between position of laser spot and the driving voltages of galvanometer scanner system has been described by a mathematical modeling.Then,a novel arbitrary scanning path generating strategy based on CSLDV is presented by deforming a normalization rectangular scanning path to an arbitrary continuous scanning path.The mapping relation between the normalization rectangular scanning path and arbitrary continuous scanning path is established using the reference points.In the second step,a compressor blade with curved surface was taken as an example for modal test using the proposed method.At the same time,a validated experiment was performed in SLDV.The results show the mode shapes derived from the extended CSLDV are in agreement with those from SLDV and the Modal Assurance Criterion(MAC)between the two are all greater than 0.96.They also demonstrate the feasibility and effectiveness of the proposed method for CSLDV test and show strong potential on further practical engineering applications. | Cuihong LIU Chaoping ZANG Biao ZHOU | 2020 | Chinese Journal of Aeronautics2020，33，12： | 3 |
| 2 | Influence of cerium ions on thermal bleaching of photo-darkened ytterbium-doped fibers显示文摘We studied the influence of cerium (Ce)ions on photo-darkening (PD)behavior in ytterbium/aluminum (Yb/Al)co-doped silica fibers at room and elevated temperatures.Low levels of PD was observed for Ce codoped Yb/Al fiber.And the Yb/Al co-doped fiber was completely bleached at -600℃.The addition of Ce ions as co-dopant can significantly lower the initial recovery and complete bleaching temperatures.The complete recovery temperature is -450℃ and -400℃ for Yb/Al/Ce low fiber and Yb/Al/Ce high fiber respectively.More importantly, Ce co-doping in Yb/Al fiber also decreases the heatinduced loss. | Xiaoxia LIU Chaoping LIU Gui CHEN Haiqing LI | 2018 | Frontiers of Optoelectronics2018，11，4： | 1 |
| 3 | Foam-like boron-doped g-C_(3)N_(4) as acid-base cooperative catalyst for efficient nucleophilic addition in water显示文摘Intramolecular acid-base cooperative catalysis is a powerful strategy to promote the nucleophilic additions in synthetic chemistry,since both substrates and nucleophiles can be activated simultaneously,yielding a lower energy reaction pathway.However,the systems often suffer from catalyst quenching due to the mutual neutralization of acid/base sites.Herein,we doped the boron(B)atoms in the tri-s-triazine ring of graphite-like carbon nitride(g-C_(3)N_(4))framework,to develop the acid-base cooperative catalyst for nucleophilic addition.Characterization results demonstrated a foam-like hierarchical porous structure,as well as the coexistence of Lewis acid and base sites in the as-synthesized samples.As a result,the B-doped g-C_(3)N_(4) acted as the efficient acidbase cooperative catalysts,significantly promoting the Knoevenagel condensation whose key step involves in nucleophilic addition.A wide range of α,β-unsaturated carbonyl compounds with remarkably high yields(>90%)was achieved even within 1 h in water,whereas the acid-free or base-free counterpart was far less efficient.In addition,the bifunctional catalysts exhibited excellent reusability with simple treatment.The novel B-doped g-C_(3)N_(4) catalytic system offers several advantages,such as operational simplicity,mild reaction conditions,high efficiency,and facile reuse of catalyst.All these advantages make it a benign protocol from the sustainability point of view,and inspired us to design the other bifunctional cooperative catalysts for a wide range of sustainable industrial applications. | Jiajun Wang Zewei Liu Shiye Li Chaoping Li Su Liu Jingwen Feng Rong Tan | 2021 | Green Chemical Engineering2021，2，2： | 1 |
| 4 | Facile Synthesis and Electrochemical Characterization of Porous and Dense TiO2 Nanospheres for Lithium-ion Battery Applications显示文摘 | Wang Hong-En Cheng Hua Liu Chaoping | 2011 | J Power Sources2011，196，： | 1 |
| 5 | 3-D Simulation Study on Seismic Response of Bridge Piles in Landslide显示文摘The anti-slide support structure is widely used in the anti-seismic reinforcement of bridge foundations,but related experimental research was processing slowly. Based on the prototype of the Jiuzhaigou bridge at the Chengdu-Lanzhou Railway,a 3-D simulation model was established on the basis of the shaking table model test,and the rationality of the dynamic analysis model was verified by indicators such as the bending moment of the bridge piles,peak soil pressure,and PGA amplification factors. The results show that the inertia force of the bridge pier has an important influence on the deformation of the pile foundation. The bending moment and shearing force are larger in lateral bridge piles,and the maximum value is near the pile top. The PGA amplification factor is stronger in the back of the rear anti-slide piles and so is it in front of the bridge pier,and the soil is prone to slip and damage. The bedrock is rigid and the dynamic response is maintained at a low level. The anti-slide piles in the rear row play a major role in the anti-seismic reinforcement design,and the anti-slide piles in the front row can be used as an auxiliary support structure. | Hou Chaoping Liu Qi | 2018 | Earthquake Research in China2018，32，3： | 0 |
| 6 | Controllable optical emission wavelength in all-inorganic halide perovskite alloy microplates grown by two-step chemical vapor deposition显示文摘All-inorganic halide perovskites(IHP),CsPbX_(3)(X=Cl,Br,I)exhibiting efficient optical emissions within the spectral range of 410 to 730 nm are potential candidates for many optoelectronic devices.Anion alloying of these IHPs is expected to achieve tunable emission wavelength covering the entire visible spectrum.Here,we developed a two-step chemical vapor deposition(CVD)process for growing quaternary IHP CsPbX_(3)(X=Cl/Br and Br/I)alloys.By exploiting the fast diffusion of halide anions in IHPs,the alloy composition can be precisely controlled by the growth time of the respective layers once the growth of the individual ternary IHP is optimized.Hence complexities in the multi-parameter optimization in the conventional CVD growth of quaternary alloys can be mitigated.Using this process,we synthesized single crystalline,homogeneous and thermally stable CsPbCl3_((1−X))Br_(3x)and CsPbBr3_((1−X))I_(3x)perovskites alloy microplates and demonstrated continuously tunable emission covering the spectrum from 428 to 715 nm by varying the halide compositions in the alloys.These alloy microplates also exhibit room temperature amplified spontaneous emissions(ASE)along with strong photonic discharges from the microplate’s edges and hence are potentially useful as a gain medium as well as optical cavities for emissions with wavelengths covering the visible spectrum. | Mohammad K.Hossain Pengfei Guo Wayesh Qarony Yuen H.Tsang Chaoping Liu Sai W.Tsang Johnny C.Ho Kin M.Yu | 2020 | Nano Research2020，13，11： | 0 |
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