http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Yonghui Zhao(Yonghui Zhao) (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
-
Yonghui Zhao(Yonghui Zhao),Jia Zhao(Jia Zhao),Xiaolei Wang(Xiaolei Wang) 한국무역연구원 2022 무역연구 Vol.18 No.6
Purpose – The growth of mobile delivery apps is expanding further due to the increase in nonface- to-face consumption due to social distancing in the COVID-19 situation. It is essential to understand what factors are causing this mobile delivery app market to grow significantly. Design/Methodology/Approach – To achieve the purpose of the study, independent variables were selected by searching for prior literature on UTAUT, and a questionnaire was designed according to the situation in Korea. The survey was conducted through Google Online, and statistical analysis of the research model was conducted using SPSS 25.0. Findings – According to the results of this study, the factors that significantly influence the intention to use mobile delivery apps were Performance Expectancy (PE), Effort Expectancy (EE), Social Influence (SI), and Facilitating Conditions (FC). In addition, the result indicated that Behavioral Intention (BI) had a statistically significant effect on Use Behavior (UB). Research Implications – This study will predict the user behavior of mobile delivery apps by dealing with the technical attributes of mobile delivery apps and the influencing factors that consumers recognize. In addition, as a mobile delivery app company, it is expected to play a role in establishing the marketing direction of mobile delivery apps.
-
Yonghui Zhou,Hu Sun,Anhai Li,Minghang Lv,Chaoyi Xue,Jun Zhao 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.7
The Johnson-Cook (JC) constitutive model was utilized to simulate the processing of Al-Si piston alloy ZL109 to obtain the optimal finishing parameters in polycrystalline diamond (PCD) tool, and studied the machining quality of ordinary-turning under the optimized cutting parameters. PCD is brittle, so it is difficult to manufacture orthogonal blades and is easy to break and high cost. We have adopted ordinary-turning quality to verify simulation results. Effect of cutting parameters on residual stress, cutting force and temperature was investigated through simulation, meanwhile, effect of cutting parameters on surface roughness and residual stress was analyzed by experiments. It indicates the verification method is practicable, and residual stress, cutting force and temperature are the smallest in simulation, and the experimental values of surface roughness and residual stress are also the smallest under the optimal cutting parameters, which can guide the cutting parameters selection to obtain higher machining quality.
-
Hydrogen production by catalytic steam reforming of waste cooking oil over La-Ni/ZSM-5 catalyst
Xiao Na,Zhao Rui,Liu Yufei,Zhan Wei,Xu Yonghui,Wu Zhengshun 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.9
Ni/ZSM-5 catalyst is one of the promising catalysts to improve the catalytic steam reforming of waste cooking oil (WCO) for hydrogen production. Furthermore, the introduction of lanthanum (La) plays a huge role in inhibiting metal sintering and carbon deposition and improving the stability and activity of the catalyst. This study investigated the effects of reaction temperature (600–800 °C), steam to carbon molar ratio (S/C), n Ni/ZSM-5 (n=5, 10, and 15 wt%), and the addition of promoter (La) on the experimentally generated hydrogen yield and carbon deposition. Results showed that the experiment used 6 wt% La-10 wt% Ni/ZSM-5 at 0.1 MPa, 700 °C, space-time (τ)=0.56 gcatalyst/gWCO, and S/C=5.25, which obtained the yield of H2 was 154.12 mol/kg, carbon deposition was 5.38%. Therefore, Ni-modified catalyst added La to improve the catalyst coking resistance and prevent carbon formation. Moreover, La can further promote the dispersion of nickel on the surface of the carrier and improve the catalytic performance of the catalyst for steam reforming reaction.
-
Xue Bai,Yinghui Zhao,Zhenhu Song,Hui Chen,Sihang Zhang,Yonghui Luo,YingChun Gu,Shijian Tu,Guo Yao,Sheng Chen 한국섬유공학회 2022 Fibers and polymers Vol.23 No.3
The preparation of polymer nanocomposites combined with high strength, toughness, and high transparencyremains a challenge. Aramid fibers are often used as fiber-reinforced materials for their superior mechanical and thermalproperties, but the weak interfacial force between aramid fibers and matrix polymer limits the application in compositematerials. In this work, aramid nanofibers were prepared by a two-step process, which included deprotonation and acidhydrothermal treatment to obtain better dispersions in general solvents. The hydrothermal aramid nanofibers (HANFs) wereused as reinforcing materials and blended with polyacrylonitrile (PAN) to prepare polyacrylonitrile/aramid nanofibers (PAN/HANFs) composite films with different mass fractions of HANFs. The morphologies of HANFs and the thermal, optical, andmechanical properties of composite films were investigated. Interestingly, when the mass fraction of aramid nanofibers wasless than 1.0 %, the composite films were synchronously strengthened and toughened. When the mass fraction of HANFswas 0.5 %, the tensile strength and toughness of the PAN/HANFs composite film reached 62.04 MPa and 22.56 MJ/m3,which were 74.23 % and 162.31 % higher than the pure PAN film, respectively. Besides, its average transmittance in thevisible light region remained 76.34 %. This work may offer a novel and facile strategy for high transparent reinforcedpolymer composites, which have potential applications in high strength fiber or optical film.
-
Failure Mechanisms of Graded Ceramic Tool in Ultra High Speed Dry Milling of Inconel 718
Guangming Zheng,Jun Zhao,Anhai Li,Xiaobin Cui,Yonghui Zhou 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
A graded ceramic tool material was fabricated by hot-pressing. Its cutting performance and failure mechanisms were investigated in dry face milling of Inconel 718 using round inserts at ultra high speeds ranging from 500 to 1600 m/min. The results showed that the microscopic chip shape was serrated type and the minimal cutting force was obtained at 900 m/min under this ultra high speed cutting conditions. Due to the enhanced mechanical properties and higher fracture resistance, the graded tool showed a selfsharpening characteristic. And the notch wear resistance of the graded tool was higher than that of the common reference tool under the same cutting condition. The failure mechanisms involved chipping, flaking, abrasive wear and adhesive wear. The mechanisms responsible for the higher cutting performance of the graded tool were determined to be the higher mechanical properties. The understanding of the failure mechanisms in ultra high speed milling processes can provide the guidance for the proper application of the tools, furthermore the guidance for tool materials design.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
