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- 저자 : Yachao Wang (검색결과 5 건)
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Wang Yachao,Lin Xiaoran,Wang Mei 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.79 No.4
Tributyrin, tricaproin and tricaprylin molecules are typical representatives of short-medium chain-saturated triglycerides and maybe used as additives to improve the viscosity of natural ester insulating oil. In this work, we study the effect of an electric field on the molecular properties of the three molecules using density functional theory (DFT) and time-dependent density functional theory (TD-DFT). The level of electric field intensity during streamer initiation and propagation in insulating oil was considered for the intensities from – 3.8 × 109 V/m to 3.8 × 109 V/m. The molecular structures, infrared spectra, orbital energies and excited states under different applied electric fields were calculated. The molecular structures of the three kinds of molecules showed obvious changes and the Stark effect was observed under the electric field. Compared with tributyrin and tricaproin, the electric field has more influence on the orbital energy level of tricaprylin. The ionization potential of tricaprylin was reduced by about 25% when the electric field intensity was 3.8 × 109 V/m. The calculated results for the excited states show that the dependence of the excitation energy on the intensity of electric field was not as strong as that of the ionization potential on the electric field. On the whole, tributyrin and tricaproin showed more stable properties than tricaprylin under an applied electric field. The results can deepen our understanding of the discharge mechanism of natural esters under an applied electric field, especially the characteristics of the short-chain-saturated triglycerides. They also provide theoretical support for the improved performance of natural ester insulating oil.
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Xingming Sun,Yachao Hu,Baowei Wang,Jian Zhang,Tao Li 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.8
Localization systems have been identified as key issues in the development and operation of wireless sensor networks. The global positioning system (GPS) solves the problem about localization, but it is not suitable for wireless sensor networks. Due to range-free localization approaches requiring low equipped hardware and easy to implement, it is widely used in WSNs localization system. When the node communication radius increases, the accuracy of area-based localization is reduced. It is important to improve the localization accuracy in this situation. In this paper, to improve the accuracy of the node localization, we propose a new range-free localization using Voronoi diagrams based approximate point-in-triangulation test (APIT) algorithm. We compare our algorithm with APIT. Simulation results show that the VPIT improved the precision of localization by narrowing the node's geometry region.
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Experimental Study of Seismic Damage with Park-Ang Model for Recycled Aggregate Concrete Columns
Yujiang Fan,Ziqiang Guo,Yachao Wang,Pengcheng Zhao,Binshan Yu 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.9
By means of the low cycle loading tests on six recycled aggregate concrete (RAC) columns with different proportions, in combination with the Park-Ang two-parameter damage model suitable for ordinary concrete columns and the damage degree Dc of actual structures, the calculated value of cyclic loading coefficient β of recycled aggregate concrete columns was determined. It would be achieved by analyzing the calculated β that the impact of the replacement ratio of recycled aggregate and the content of mixed fibers on β was significantly different. Considering the reinforcement ratio mentioned in paper. Matlab was further employed to fit multivariable linear equation regarding recycled aggregate replacement ratio, mixed fibers contents and reinforcement rate as the basis, so that the computation formula of the cyclic loading coefficient β suitable for recycled aggregate concrete columns was revealed.
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Liu Hongxia,Dou Rui,Wang Jifei,Zhu Yachao,Li Jingyao,Liu Jinlong,Wang Yang,Zhang Jintong,Jing Xiaoyuan 한국곤충학회 2022 Entomological Research Vol.52 No.2
The phytophagous caterpillar Illiberis ulmivora is a serious pest of Ulmus glaucescens Franch (Ulmaceae, Ulmus). In order to test potent sex attractant, field trails of synthetic candidate attractants were conducted in China. In this study, baits with ternary blends, (2S)-butyl (7Z)-dodecenoate, (2S)-butyl (9Z)-tetradecenoate, and (2S)-butyl (5Z)-decenoate (8:4:1 ratio) resulted in a higher number of male moths capture than the rest of the baits that were offered. Traps positioned at a height of 1.2 m attracted more males than those installed at heights of 2.2 m and 3.2 m. The slope aspect, temperature and humility had a significant effect on the trap catches. More catches occurred in traps placed on semi-shady and semi-sunny slopes than those placed on sunny and shady slopes. The number of pheromones in the septa decreased with age. The residual amounts of pheromones in the lures combined with 2,6-di-tert - butyl-p-cresol (BHT) were higher than those in the control. However, there were no differences in the male captures between components and components combined with BHT during the first 8 d. These findings on monitoring and trap positions can be used to predict the occurrence and population dynamics of I. ulmivora, to develop ecological management of I. ulmivora.
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Haoran Jiang,Yong Jiang,Xianli Zhu,Yachao Wang 한국고분자학회 2020 Macromolecular Research Vol.28 No.13
Intumescent flame retardant coating modified by aluminate coupling agent were prepared via sol-gel method using ammonium polyphosphate, polyacrylamide, aluminate coupling agent (ACA), and boron nitride (BN). The effect of modification of ACA on its flame retardant and characterization were preliminarily studied by cone calorimeter, scanning electron microscope, surface tensiometer and contact angle measurement. It is found that the addition of ACA can increase the expansion rate of carbon layer, and a stronger blocking effect can lead to a better property of flame retardant. The sample containing BN, after being modified by 3M NaOH and ACA, dramatically decreases heat release rate, especially reduce the peak heat release rate (pHRR) by 54% and total heat release by 16%, respectively. Moreover, the time to ignition was delayed by 175%. Through examining the residues and pyrolysis products of the coating samples, the mechanism of enhanced flame retardant that promotes the char-forming and heat barrier of the modification of ACA and BN is proposed. This work can offer a significant guide for further studying of ACA and modified BN on the flame retardant.
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