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- 저자 : Congqi Yang (검색결과 3 건)
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Nanomaterials-assisted thermally induced neuromodulation
Congqi Yang,Seongjun Park 대한의용생체공학회 2021 Biomedical Engineering Letters (BMEL) Vol.11 No.3
Neuromodulation, as a fast-growing technique in neuroscience, has been a great tool in investigation of the neural pathwaysand treatments for various neurological disorders. However, the limitations such as constricted penetration depth, low temporalresolution and low spatial resolution hindered the development and clinical application of this technique. Nanotechnology,which refers to the technology that deals with dimension under 100 nm, has greatly infl uenced the direction of scientifi cresearches within recent years. With the recent advancements in nanotechnology, much attention is being given at applyingnanomaterials to address the limitations of the current available techniques in the fi eld of biomedical science includingneuromodulation. This mini-review aims to introduce the current state-of-the-art stimuli-responsive nanomaterials used forassisting thermally induced neuromodulation.
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Bending characteristics of corroded reinforced concrete beam under repeated loading
Congqi Fang,Shuai Yang,Zhang Zhang 국제구조공학회 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.47 No.6
Bending behaviors of corroded reinforced concrete (RC) beams under repeated loading were investigated experimentally. A total of twenty test specimens, including four non-corrosion and sixteen corrosion reinforced concrete beams, were prepared and tested. A numerical model for flexural and cracking behaviors of the beam under repeated loading was also developed. Effects of steel corrosion on reinforced concrete beams regarding cracking, mid-span deflection, stiffness and bearing capacity of corroded beams were studied. The impact of corrosion on bond strength as the key factor was investigated to develop the computational model of flexural capacity. It was shown from the experimental results that the bond strength between reinforcement and concrete had increased for specimen of low corrosion levels, while this effect was changed when the corrosion level was higher. It was indicated that the bearing capacity of corrosion beam increased even at a corrosion level of about 5%.
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Cong Qi,Tiantian Chen,Yuxing Wang,Liyuan Yang 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.9
Due to the low heat transfer efficiency of common heat exchange systems, an improved heat exchange system was developed. Enhanced tubes (elliptical tubes with a built-in turbulator) instead of a smooth tube were used and TiO2-water nanofluids were substituted for water to intensify the heat transfer. The influences of turbulator (presence or absence), axial ratios of elliptical tubes (Z=1.235, 1.471, 1.706), nanoparticle concentration (=0.0 wt%, 0.1 wt%, 0.3 wt%, 0.5 wt%), and Reynolds number (Re=400-12,000) on the flow and heat transfer properties of TiO2-water nanofluids were studied. Thermal and exergy efficiency were used to research the comprehensive thermo-hydraulic characteristics of these heat transfer enhancement technologies. The thermo-hydraulic properties of nanofluids all showed an increasing trend with the growing axial ratio, nanoparticle concentration and Reynolds number. Nanofluids (=0.5 wt%) in an elliptical tube (Z=1.706) with a built-in turbulator showed the best thermal performance, which could be increased by 33.8% in comparison with water at best. The thermal efficiency index increased first and then decreased with the Re. Nanofluids in elliptical tubes with a built-in turbulator can clearly promote heat transfer under the identical condition.
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