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Fu Xin,Jie Zhang,Zhiyuan Chen,Xiaorong Du 기술경영경제학회 2016 ASIAN JOURNAL OF TECHNOLOGY INNOVATION Vol.24 No.3
This paper aims to fill the gap in the extensive literature on the results of interaction betweenpublic and private R&D expenditures. Two types of public R&D subsidies, the appropriationsand loan interest, are investigated in the effect of public subsidies by applying for a uniquemicro data set of Chinese manufacturing firms combined with the Innovation Fund forSmall and Medium Technology-based Firms (Innofund). The results are consistent with theprediction that loan interest subsidies based on more competitive selective system are moreeffective for the public R&D subsidies than the appropriations. Firms’ heterogeneity,measured by state-owned enterprises (SOEs) and private-owned enterprises (POEs), is testedfor the different impact of public subsidies on corporate R&D investment. The results showthat the crowding-in effect is mainly driven by POEs, not by SOEs, which confirms thetheoretical assumption by Aghion and Tirole that the agency problem play a dominant rolein corporate R&D activities. An improved econometric method, combined propensity scorematching with difference-in-differences estimation strategy, is applied for correcting theselection bias. Our results are robust to different matching techniques.
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Fatigue Strength and Root-Deck Crack Propagation for U-Rib to Deck Welded Joint in Steel Box Girder
YuanZhou Zhiyuan,Ji Bohai,Li Di,Fu Zhongqiu 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.5
Fatigue tests and numerical analysis were carried out to evaluate the fatigue performance at the U-rib to deck welded joint in steel box girder. Twenty specimens were tested corresponding to diff erent penetration rates (80 and 100%) under fatigue bending load, and the fatigue strength was investigated based on hot spot stress (HSS) method. The detailed stress distribution at U-rib to deck welded joint was analyzed by the fi nite element method, as well as the stress intensity factor of weld root. The test results show that the specimens with fully penetration rate have longer crack propagation life due to the welding geometry, resulting in higher fatigue failure strength. The classifi cation of FAT-90 is reasonable for evaluating fatigue strength by HSS method. The penetration rate has eff ect on crack propagation angle near the surface, and the 1-mm stress below weld toe and root approves to be more suitable for fatigue stress assessment, because of its high sensitivity to weld geometry than HSS.
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Fatigue Performance of Cracked Rib-Deck Welded Joint Retrofitted by ICR Technique
YuanZhou Zhiyuan,Ji Bohai,Fu Zhongqiu,Ge Hanbin 한국강구조학회 2016 International Journal of Steel Structures Vol.16 No.3
To evaluate the retrofit effect by ICR technique (a new technique developed in recent years), relative tests were carried out with two cracked rib-deck specimens. The fatigue performance, including crack propagation rate, remaining fatigue life, and stress variation was analyzed. An improvement was observed through the test results after the cracked specimen retrofitted. Crack propagation in the treated specimen was restrained by the closed surface and residual compressive stress, and the crack propagation rate was reduced significantly. Stress at the welded joint and the crack tip was redistributed after ICR treatment. An increasing has been found near the weld toe, and reduction is occurred at the crack tip, which matches FEM results. This stress variation might contribute to a delay in subsequent crack propagation.
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Structural Evolution of Sub-10 nm Octahedral Platinum–Nickel Bimetallic Nanocrystals
Chang, Qiaowan,Xu, Yuan,Duan, Zhiyuan,Xiao, Fei,Fu, Fang,Hong, Youngmin,Kim, Jeonghyeon,Choi, Sang-Il,Su, Dong,Shao, Minhua American Chemical Society 2017 NANO LETTERS Vol.17 No.6
<P>Octahedral Pt alloy nanocrystals (NCs) have shown excellent activities as electrocatalysts toward oxygen reduction reaction (ORR). As the activity and stability of NCs are highly dependent on their structure and the elemental distribution, it is of great importance to understand the formation mechanism of octahedral NCs and to rationally synthesize shape-controlled alloy catalysts with optimized ORR activity and stability. However, the factors controlling the structural and compositional evolution during the synthesis have not been well understood yet. Here, we systematically investigated the structure and composition evolution pathways of Pt-Ni octahedra synthesized with the assistance of W(CO)(6) and revealed a unique core-shell structure, consisting of a Pt core and a Pt-Ni alloy shell. Below 140 degrees C, sphere-like pure Pt NCs with the diameter of 3-4 nm first nucleated, followed by the isotropic growth of Pt-Ni alloy on the seeds at temperatures between 170 and 230 degrees C forming Pt@Pt-Ni core-shell octahedra with {111} facets. Owing to its unique structure, the Pt@Pt-Ni octahedra show an unparalleled stability during potential cycling, that is, no activity drop after 10 000 cycles between 0.6 and 1.0 V. This work proposes the Pt@Pt-Ni octahedra as a high profile electrocatalyst for ORR and reveals the structural and composition evolution pathways of Pt-based bimetallic NCs.</P>
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A magnetostrictive self-powered biosensor based on Au-BaTiO3-FeGa & PDMS
Qiang Zhang,Meng Xu,Yan Liu,Chunyan Zhang,Rui Zhang,Zhiyuan Fu,Jianlong Ji,Riguang Zhang,Shengbo Sang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.117 No.-
Piezoelectric flexible sensors have been used to detect biomolecules such as sweat and glucose because oftheir passive, simple structure and high sensitivity. This paper proposes a novel flexible piezoelectric Au-BaTiO3-FeGa & PDMS biosensor in which magnetostrictive deformation amplifies the surface stress generatedby biomolecules combining on the thin film. The modification process of bovine serum albumin(BSA) binding with the sensor was initially determined by the first principles approach. Then, the sensingmechanism was verified by finite-element simulation. Based on the simulation results, flexible Au-BaTiO3-FeGa & PDMS biosensors were prepared, modified, and measured. The structure, modification,and detection of the sensors were analyzed by digital microscopy, Fourier transform infrared spectrometry(FTIR), atomic force microscopy (AFM), and scanning electron microscopy (SEM). The responses ofthe biosensors detecting different BSA solution concentrations under magnetic fields were then investigated. Experimental results indicate that the biosensor has the highest sensitivity under a magnetic fieldof 30 mT.
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