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Zhang, Zhenhao,Paul, Suvash C.,Panda, Biranchi,Huang, Yuhao,Garg, Ankit,Zhang, Yi,Garg, Akhil,Zhang, Wengang Techno-Press 2020 Advances in concrete construction Vol.10 No.1
Flexural and splitting strength behavior of conventional concrete can significantly be improved by incorporating the fibers in it. A significant number of research studies have been conducted on various types of fibers and their influence on the tensile capacity of concrete. However, as an important property, tensile capacity of fiber reinforced concrete (FRC) is not modelled properly. Therefore, this paper intends to formulate a model based on experiments that show the relationship between the fiber properties such as the aspect ratio (length/diameter), fiber content, compressive strength, flexural strength and splitting strength of FRC. For the purpose of modeling, various FRC mixes only with steel fiber are adopted from the existing research papers. Automated neural network search (ANS) is then developed and used to investigate the effect of input parameters such as fiber content, aspect ratio and compressive strength to the output parameters of flexural and splitting strength of FRC. It is found that the ANS model can be used to predict the flexural and splitting strength of FRC in a sensible precision.
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张,昱昊(Yuhao Zhang),徐吉霖(Jilin Xu) 동아시아무역학회 2020 Journal of East Asian Trade(JEAT) Vol.2 No.2
本研究的目的是分析新冠状病毒肺炎疫情对中国电子商务行业的影响,并针对研究提出合理的经营策略,为中国电子商务的未来发展提出参考性建议。本研究的研究方法主要是以文献数据为主,对电子商务的相关文献和数据进行分析。根据本研究的研究结果得知依靠网络通信技术的电子商务已经逐渐发展成熟稳定,但随着新冠状病毒肺炎疫情的扩散,电子商务出现了供应链断裂和资金链短缺等问题。本研究的意义在于对新冠疫情下电商行业制定积极有效的措施促进电商行业的可持续发展。 但在本研究的研究过程中发现根据电商企业规模的不同,受新冠状病毒肺炎疫情的影响也不同,所以后续研究中以中国中小型电商企业为调查对象进行问卷调查,根据数据反馈找出疫情对电商企业的影响,作为本研究数据补充。 Purpose - The purpose of this study is to analyze the impact of the COVID-19 on China’s e-commerce industry, and to put forward reasonable management strategies for the future development of e-commerce in China. Design/Methodology/Approach -The research method of this study is mainly based on literature data, and analyzes the relevant literature and data of electronic commerce. Findings - According to the research results of this study, it is known that e-commerce relying on network communication technology has gradually developed mature and stable, but with the spread of COVID-19, e-commerce has problems such as supply chain breakage and shortage of capital chain. Research Implications - In the management of this paper, this study is of great significance to the development of e-commerce in China in the future.
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Yuhao Li,Rui Liu,Zhangwei Yan,Xiangning Zhang,Hongjun Zhu 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.11
A series of oxazolidinone-based strobilurin analogues were efficiently synthesized by the reaction of 3-(2-bromomethylphenyl)oxazolidin-2-one with 1-substituted phenyl-2H-pyrazolin-3-one. Their structures were confirmed and characterized by 1H-NMR, 13C-NMR, elemental analysis, and mass spectroscopy. In addition, the crystal structure of the target compound 3-(2-((1-phenyl-2H-pyrazol-3-yloxy)methyl)phenyl) oxazolidin-2-one was determined by single crystal X-ray diffraction. The bioassay results of these compounds indicated that some of the oxazolidin-2-one derivatives containing N-substituted phenyl 2H-pyrazol ring exhibited potential in vivo fungicidal activities against M. grisea at the dosage of 1 g L‒1.
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Li, Yuhao,Liu, Rui,Yan, Zhangwei,Zhang, Xiangning,Zhu, Hongjun Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.11
A series of oxazolidinone-based strobilurin analogues were efficiently synthesized by the reaction of 3-(2-bromomethylphenyl) oxazolidin-2-one with 1-substituted phenyl-2H-pyrazolin-3-one. Their structures were confirmed and characterized by $^1H$-NMR, $^{13}C$-NMR, elemental analysis, and mass spectroscopy. In addition, the crystal structure of the target compound 3-(2-((1-phenyl-2H-pyrazol-3-yloxy)methyl)phenyl) oxazolidin-2-one was determined by single crystal X-ray diffraction. The bioassay results of these compounds indicated that some of the oxazolidin-2-one derivatives containing N-substituted phenyl 2H-pyrazol ring exhibited potential in vivo fungicidal activities against M. grisea at the dosage of $1\;g\;L^{-1}$.
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Hui Chang,Yuhao Chen,Nan Zhang,Yan-Rong Zhu,Ting-Feng Yi 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.105 No.-
FePO4 coated Li5Cr7Ti6O25 nanocomposites are synthesized according to a simple sol–gel method followingby a calcination procedure. XRD and Rietveld refinement result indicate that FePO4 decorating doesnot change the crystal structure and lattice parameters of Li5Cr7Ti6O25. SEM and TEM prove that the particlesize of all sample are evenly distributed in the 50–100 nm range. Both energy dispersion spectroscopymapping and HRTEM indicate the existence of FePO4 on the surface of Li5Cr7Ti6O25, whichprovides a good conductive contact. CV and EIS exhibit that FePO4 (3 wt%) coated Li5Cr7Ti6O25 materialhas lower polarization, larger Li+ diffusion coefficient and higher conductivity than other pureLi5Cr7Ti6O25 and other FePO4 coated Li5Cr7Ti6O25 composites. Therefore, FePO4 (3 wt%) coatedLi5Cr7Ti6O25 anode material displays the highest charge and discharge capacity at each rate. Theenhanced electrochemical performance of FePO4-coated Li5Cr7Ti6O25 result from the enhanced lithiumion and electron transfer kinetics. The pristine Li5Cr7Ti6O25 only shows a specific capacity of197 mAh g 1 at 500 mA g 1 after 100 cycles, but FePO4 (3 wt%)-coated Li5Cr7Ti6O25 achieves a highcapacity of 237.9 mAh g 1. Therefore, the FePO4 coating can be regarded as a promising strategy toimprove the electrochemical properties of Li5Cr7Ti6O25.
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Structure learning of exponential family graphical model with false discovery rate control
Liu Yanhong,Zhang Yuhao,Li Zhonghua 한국통계학회 2023 Journal of the Korean Statistical Society Vol.52 No.3
Probabilistic graphical models enjoy great popularity in a wide range of domains due to their ability to model the conditional dependency relationships among random variables. This paper explores the structure learning for the exponential family graphical model with false discovery rate (FDR) control. Most existing FDR-con-trolled structure learning procedures have been designed for the Gaussian graphical model (GGM). A systematic approach for more general exponential family graphical models is still lacking. In this paper, we introduce a unified procedure to learn the structure of the exponential family graphical model with FDR control utilizing the symmetrized data aggregation (SDA) technique via sample splitting, data screening, and information pooling. We show that our method controls FDR asymptotically under some mild conditions. Extensive simulation results and two real-data examples validate the effectiveness of our method.
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Effect of activator types on cement mortar with polymeric aluminum chloride waste residue
Ping Xu,Yuhao Cui,Dong Han,Minxia Zhang,Yahong Ding Techno-Press 2023 Advances in concrete construction Vol.15 No.3
Water glass (WG) and sodium sulfate (SS) were used to prepare polymeric aluminum chloride residue cement mortar (PACRM) by single and compound blending with polymeric aluminum chloride waste residue, respectively. The structural strength and textural characteristics examinations showed that PACRM consistency increased by incorporating WG, but decreased by incorporating SS. When WG and SS were compounded, the mortar consistency initially rose before falling. The compressive strength of PACRM increased and then decreased as WG was increased. The mechanical properties of PACRM were better enhanced by SS than WG, showing no strength deterioration. The main reason for the improved mechanical properties of polymeric aluminum chloride waste residue in the presence of activators is the increased precipitation of reactive substances, such as C-S-H gels, calcium silica, and Ca(OH)<sub>2</sub>. The density of the specimens with PACRM and the degree of aggregation of hydration products were significantly enhanced by generating more hydration products in the mortar. Further, the cracks and pores were significantly reduced, and the matrix structure was continuous and dense at 5% SS doping and 3% compound doping.
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Jiabei Jiang,Weiwei Zhang,Jihong Jeung,Yuhao Huang 한국HCI학회 2020 한국HCI학회 학술대회 Vol.2020 No.2
With the ubiquity of smart devices and the aging population,more and more elderly people begin to use smart devices. Their main application ranges from phone calls and messaging to payment and navigation. Many studies have been conducted on the evaluation of usability of smart device for the elderly. However, few of them were focused on the characteristics and difficulties of the elderly people in smartphone photography. This study took the elderly people as the target to research on their experience of using photo-shooting applications. Based on questionnaires and interviews, combined with qualitative and quantitative researches, this paper explores the social influence of taking pictures with smartphones on both the physical and the psychological aspects. The results show: 1)The majority of elderly people use smartphone photography; gender and living conditions are the main factors affecting shooting experience, while age is not; Smartphone photography has changed the way they think and their life habits; 2)Very few of the elderly share their photos on social network service(SNS) because of the risk of privacy leakage and mis-operation; while viewing family and friends’ photos could bring them senses of participation; 3)The main difficulties for the elderly are album management and the lack of affordance of the interface elements; 4)The needs of the elderly people in smartphone photography cannot be ignored.
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Simulation of Impact Toughness with the Effect of Temperature and Irradiation in Steels
Chenchong Wang,Jinliang Wang,Yuhao Li,Chi Zhang,Wei Xu 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.1
One of the important requirements for the application of reduced activation ferritic/martensitic steel is toretain proper mechanical properties in irradiation and high temperature conditions. In order to simulatethe impact toughness with the effect of temperature and irradiation, a simulation model based on energybalance method consisted of crack initiation, plastic propagation and cleavage propagation stages wasestablished. The effect of temperature on impact toughness was analyzed by the model and the trend ofthe simulation results was basicly consistent with the previous experimental results of CLAM steels. Theload-displacement curve was simulated to express the low temperature ductile-brittle transition. Theeffect of grain size and inclusion was analyzed by the model, which was consistent with classicalexperiment results. The transgranular-intergranular transformation in brittle materials was alsosimulated.
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