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- 저자 : BoWu (검색결과 9 건)
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Bo Wu,Rui Wang,Guo Zheng,Cun Zhou 한국섬유공학회 2020 Fibers and polymers Vol.21 No.1
In this article, phosphate modified epoxy resin (PAEK) and polyethylene oxide (PEO) were used as the mainmonomers to fabricate a composite sizing agent (TPP) for carbon fiber (CF) surface treatment. The effects of TPP sizing onthe surface morphology, activity and wettability of CF were studied by FE-SEM, XPS and contact angle. In addition, frictioncoefficients, fuzz amount and the mechanical properties of CF filaments, as well as the interlaminar shear strength (ILSS) ofCF composites were analyzed. The results indicate that the defects of CF surface were completely repaired by TPPmolecules, the content of active groups increased by 24.8 % and the contact angle and the spreading time of EP on CF surfacereached respective minimum values of 43.5 o and 15 s, meanwhile, the friction coefficient and the fuzz amount of the treatedCF surface are reduced in the sizing quantity range of 3.0-4.0 mg/g. Thus, there were 36.1 % and 24.3 % enhancement in thebreaking strength and elongation of CF filament. In addition, the ILSS of composite prepared with TPP treated CFs wasincreased from 12.81 to 28.55 MPa.
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Bo Wu,Peng Li,Fenghua Zhang,Feng Tian 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.5
In this study, an orthotropic plate arranged at the bottom of the phase change material (PCM) -based heat sink is employed to enhance the temperature field uniformity (TFU) in the heat sink. The performance of the orthotropic plate in enhancing the TFU is numerically studied during the melting process of the PCM. The effects of the orthotropic conductivity (R) are examined at R = 10 Rb, 5 Rb, 0.2 Rb and 0.1 Rb. The configuration including a copper plate is also taken into consideration as a contrast to achieve a more objective and deeper insight. It is found that the orthotropic plate can significantly enhance the TFU by up to 4 times in the PCM regions; it can also narrow down the temperature range in the heat sink region. When the orthotropic conductivity is greater than Rb, it can even benefit in improving the performance of thermal management of the heat sink. Principles about the orthotropic conductivity are drawn and comprehensive evaluations are conducted to guide in designing PCM-based heat sink for thermal management of avionics.
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Experimental study on fire performance of axially-restrained NSC and HSC columns
Bo Wu,Yi-Hai Li 국제구조공학회 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.32 No.5
This paper describes fire performance of eight axially restrained reinforced concrete (RC) columns under a combination of two different load ratios and two different axial restraint ratios. The eight RC columns were all concentrically loaded and subjected to ISO834 standard fire on all sides. Axial restraints were imposed at the top of the columns to simulate the restraining effect of the rest of the whole frame. The axial restraint was effective when the column was expanding as well as contracting. As the results of the experiments have shown, the stiffness of the axial restraint and load level play an important role in the fire behaviors of both HSC and NSC columns. It is found that (a) the maximum deformations during expanding phase were influenced mostly by load ratio and hardly by axial restraint ratio, (b) For a given load ratio, axial restraint ratio had a great impact on the development of axial deformation during contraction phase beyond the initial equilibrium state, (c) increasing the axial restraint increased the value of restraint force generated in both the NSC and HSC columns, and (d) the development of column axial force during the contracting and cooling phase followed nearly parallel trend for columns under the same load ratio.
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Bo Wu,Ming Lu,Wei Huang,Yangbing Lan,Yufang Wu,Zonghui Huang 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.11
Because of the harsh environment around city subways and the typically poor geological conditions, it is often difficult to ensure the stability of a tunnel, which makes it prone to collapses and other accidents. The influence of multiple factors on tunnel stability was analyzed under the same geological conditions and environmental factors by using a three-dimensional numerical simulation. Taking into account the objective environment and manual operation and other factors, construction sequence, support closure time, and reinforcement area and parameters were chosen as the main factors affecting the tunnel stability. Finally, based on ground deformation, tunnel convergence deformation, and surrounding soil stress as evaluation indicators, a fuzzy analytic hierarchy process (FAHP)-gray correlation degree-technique for order performance by similarity to ideal solution (TOPSIS) model was established. It was found that the higher the relative closeness of the construction parameter combination, the greater the tunnel stability. The best combination of construction parameters was applied to the Tiantongyuan Station project of Beijing Metro Line 17. All geological conditions being equal, reasonable selection of construction parameters can ensure optimal tunnel construction stability, reduce construction risks, and support sustainable tunnel development. In addition, the FAHP-gray correlation degree-TOPSIS method achieved multi-index evaluation of tunnel stability, which provides practical guidance for the construction of similar projects.
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Behavior of reinforced concrete beams filled with demolished concrete lumps
Bo Wu,Zhe Xu,Zhongguo John Ma,Qiongxiang Liu,Wei Liu 국제구조공학회 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.40 No.3
In the past decades, recycling use of demolished concrete was almost limited to the types of recycled coarse aggregate with a size of about 5-40 mm and recycled fine aggregate with a size of about 0-5 mm for concrete structures, and reuse of demolished concrete lumps (DCLs) with a size much larger than that of recycled aggregate, e.g., 50-300 mm, has been limited to roadbed, backfilling materials, or discarded to landfills. Treatment processes of DCLs are much simpler than those of recycled aggregate, leading to less cost and more energy-saving. In the future, the amount of demolished concrete is estimated to be much higher, so reuse of DCLs for concrete structures will become necessary. The objectives of this paper are to document the process of making reinforced concrete beams with DCLs, and to discuss the flexural and shear behaviors of those reinforced DCL beams through an experimental program, which includes three beams filled with DCLs and one conventional beam for investigating the flexural strengths and deformations, and 12 beams filled with DCLs and two conventional beams for investigating the shear strengths and deformations. The authors hope that the proposed concept offers another sustainable solution to the concrete industry.
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Bo Wu,Jianting Zhou,Jingzhou Xin,Hong Zhang,Fengbo Wu 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.8
In conventional buffeting analyses of flexible civil engineering structures, the differencesbetween the effects of longitudinal (u-) and vertical (w-) turbulence components were usuallyignored. This assumption could cause unpredictable errors and needs to be refined. Toimprove the accuracy of buffeting analyses, this paper proposes a framework combiningComputational Fluid Dynamics simulation and wind tunnel test to analyze the buffeting forcesconsidering the differences between turbulence components. First, the Aerodynamic AdmittanceFunctions (AAFs) with respect to u- and w- turbulence are numerically evaluated. Next, thetotal buffeting forces are experimentally measured. Finally, the numerical and experimentalresults are combined following a theoretical scheme to separate the effects of u- and wturbulence. Results show that u- and w- turbulence have different contributions to the buffetingforces, directly indicating the inaccuracy of the conventional assumption. In the turbulencefield investigated, the buffeting lift force at zero angle of attack (AoA) are all contributed fromthe w-turbulence, while the contribution from u-turbulence increase as AoA increases. Thisnumerical-experimental framework overcomes the limitations of the conventional method byquantitatively describing the different contributions of u- and w- turbulence.
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Bowu Chen,Yan Xue,Hua Jing,Xiaodong Wang,Peimin Zhu,Weiwei Hao,Man Li,Yueqiu Gao 한국한의학연구원 2023 Integrative Medicine Research Vol.12 No.2
Background: The effectiveness and safety of herbal medicine Huashibaidu granule (HSBD) in treating mild Coronavirus Disease 2019 (COVID-19) patients infected with SARS-CoV-2 remain to be identified. We aimed to evaluate the effectiveness of HSBD in mild COVID-19 patients. Methods: A prospective, non-randomized, controlled study in mild COVID-19 patients was conducted in Shanghai, China, from April 8 to May 6, 2022. Finally, 360 mild COVID-19 patients received HSBD (orally 20 g twice daily for 7 days), and 368 patients received herbal medicine placebo (orally 20 g twice daily for 7 days). The primary endpoints were the negative conversion rate of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) and the negative conversion time. Secondary endpoints included the hospitalized days and the improvement in the clinical condition. Results: The negative conversion rate of SARS-CoV-2 at 7 days posttreatment in the HSBD group was higher than that in the control group (95.28% vs. 82.61%, P < 0.001). The median negative conversion time in the HSBD group was markedly decreased by 2 days compared with the control group (3 [3–6] vs. 5 [4–7], P < 0.001). In addition, the median hospitalized day was shortened in the HSBD group by 1 day compared with the control group (6 [4–7] vs. 7 [5–9], P < 0.001). The clinical improvement rate (275/360 [76.39%]) in the HSBD group within 7 days was significantly higher than that (203/368 [55.16%]) in the control group (P < 0.001). The improvement of symptom scores in the HSBD group was higher than that in the control group (2 [1–4] vs. 1 [1–2], P < 0.001). No severe adverse events occurred. Conclusions: Our study suggested that HSBD effectively increased the negative conversion rate of SARS-CoV-2 and shortened the negative conversion time and hospitalized days in mild COVID-19 patients. Clinical trial registration: The trial was registered at Chinese Clinical Trial Registry, ChiCTR2200058668.
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Guangdong Zhou,BoWu,Zhiling Li,Zhijun Xiao,Shuhui Li,Ping Li 한국물리학회 2015 Current Applied Physics Vol.15 No.3
A non-volatile flash memory device based on metal oxide semiconductor (MOS) capacitor structure hasbeen fabricated using platinum nano-crystals(PteNCs) as storage units embedded in HfAlOx high-ktunneling layers. Its memory characteristics and tunneling mechanism are characterized by capacitanceevoltage(CeV) and flat-band voltage-time(ΔVFB-T) measurements. A 6.5 V flat-band voltage(memory window) corresponding to the stored charge density of 2.29 × 1013 cm-2 and about 88% storedelectron reserved after apply ±8 V program or erase voltage for 105 s at high frequency of 1 MHz wasdemonstrated. Investigation of leakage currentevoltage(JeV) indicated that defects-enhanced Pool-Frenkel tunneling plays an important role in the tunneling mechanism for the storage charges. Hence,the PteNCs and HfAlOx based MOS structure has a promising application in non-volatile flash memorydevices.
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