New Hanger Design Approach of Tied-Arch Bridge to Enhance Its Robustness

Wenqing Wu,Hao Wang,Yan-Jie Zhu,Jiangyu Yu,Hao Zhao,Hui Zhang 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.11

As the crucial components among the tied-arch bridge, the local failure of hangers may trigger a progressive collapse through the entire tied-arch bridge. However, the current design guidance as regards hangers still lacks consideration of structure robustness under an extreme hazard. To improve the structural robustness of tied-arch bridge under extreme conditions, a new hanger design method is proposed, which is termed as asymmetric parallel double-hanger system. Based on Miner’s linear cumulative damage law, an analysis on the fatigue life of the double-hanger system was conducted to verify the feasibility of the proposal, and then a dynamic time-history analysis was employed to simulate the transitory fracture impact due to one or more hangers fracturing. According to the simulation results, the structural robustness is greatly enhanced with asymmetric parallel-double hanger system design, when compared with single hanger system design. When one or more hangers reveal local damage, it will not trigger a progress failure to the whole structure in particular. Several practical suggestions of bridge system’s load-carrying capacity are also put forward for the future arch bridge design at the end of this paper.

Resonance-based sparse improved fast independent component analysis and its application to the feature extraction of planetary gearboxes

Jing Zhu,Aidong Deng,Jing Li,Minqiang Deng,Wenqing Sun,Qiang Cheng,Yang Liu 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.11

A resonance-based sparse improved fast independent component analysis (ICA) (RSIFICA) is proposed to extract the fault characteristics of planetary gearbox. First, the signal is decomposed using resonance sparse signal decomposition (RSSD). Second, highresonance components were retained while others were eliminated. Finally, the signal after dimension reduction was analyzed using ICA, and the fault characteristic frequency was extracted through envelope spectrum analysis. In this process, the preset Q parameter of RSSD is optimized on the basis of fuzzy entropy and ant-lion optimization algorithm. The accuracy of RSSD was improved by performing time-frequency entropy component selection. FastICA was improved, and the slow convergence problem of ICA was solved. Results showed that RSIFICA could extract the fault characteristic frequency accurately, and the calculation efficiency of FastICA increased by 21.49 %. In terms of extracting the fault features, its performance could be better than EMD-FastICA.

Pure blue emission from undoped organic light emitting diode based on anthracene derivative

Bangdong Ding,Wenqing Zhu,Xueyin Jiang,Zhilin Zhang 한국물리학회 2008 Current Applied Physics Vol.8 No.5

This paper presents organic light emitting diodes (OLEDs) which were fabricated by using undoped 9,10-di(2-naphthyl)anthracene (ADN) as the emitting layer, N,N'-diphenyl-N,N'-bis(3-methylphenyl)-1,1'-biphenyl-4,4'-amine (TPD) as the hole transporting layer, and one of tris-(8-hydroxy-quinolinato) aluminum (Alq3), 4,7-diphenyl-1,10-phenanthroline (Bphen) and 2-tert-butylphenyl-5-biphenyl- 1,3,4-oxadiazole (PBD) as the electron transporting layer. By optimization for the thickness of device, efficient pure blue organic light emitting diodes were obtained, which is attributed to the synergy of both the hole transporting layer and the electron transporting layer. This paper presents organic light emitting diodes (OLEDs) which were fabricated by using undoped 9,10-di(2-naphthyl)anthracene (ADN) as the emitting layer, N,N'-diphenyl-N,N'-bis(3-methylphenyl)-1,1'-biphenyl-4,4'-amine (TPD) as the hole transporting layer, and one of tris-(8-hydroxy-quinolinato) aluminum (Alq3), 4,7-diphenyl-1,10-phenanthroline (Bphen) and 2-tert-butylphenyl-5-biphenyl- 1,3,4-oxadiazole (PBD) as the electron transporting layer. By optimization for the thickness of device, efficient pure blue organic light emitting diodes were obtained, which is attributed to the synergy of both the hole transporting layer and the electron transporting layer.

Deep blue organic light emitting diode based on anthracene derivative as a dopant

Bangdong Ding,Wenqing Zhu,Xueyin Jiang,Zhilin Zhang 한국물리학회 2008 Current Applied Physics Vol.8 No.5

This letter presents a deep blue organic light emitting diode which was fabricated by using 9,10-di(2-naphthyl)anthracene as a dopant and 4,4'-N,N'-dicarbazole-biphenyl as a host. The Commission Internationale de l’Eclairage coordinates of (0.1516, 0.0836) were achieved in the cell, which is very close to the National Television Standards Committee standard of (0.14, 0.08). Meanwhile, maximum luminance over 6500 cd/cm2 and maximum current efficiency of 3.5 cd/A were also obtained. This letter presents a deep blue organic light emitting diode which was fabricated by using 9,10-di(2-naphthyl)anthracene as a dopant and 4,4'-N,N'-dicarbazole-biphenyl as a host. The Commission Internationale de l’Eclairage coordinates of (0.1516, 0.0836) were achieved in the cell, which is very close to the National Television Standards Committee standard of (0.14, 0.08). Meanwhile, maximum luminance over 6500 cd/cm2 and maximum current efficiency of 3.5 cd/A were also obtained.

Effect of Scandium in Al–Sc and Al–Sc–Zr Alloys Under Precipitation Strengthening Mechanism at 350 °C Aging

Xue Na,Liu Wenqing,Zhu Liu,T. Muthuramalingam 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12

In the present scenario, it is much needed of developing Al–Sc and Al–Sc–Zr alloys owing to its higher strength to weightfor aerospace applications. The present study is dealt about effect of Scandium on micro hardness and micro structure ofsynthesized Al–Sc alloy and Al–Sc–Zr alloy under different weight percentage. The precipitation strengthening of as-caststructure, Al–Sc alloy and Al–Sc–Zr alloy have been analyzed during aging at 350 °C. From the experimental investigation,only little difference in micro hardness of developed alloys was observed during initial stage of aging. The peak hardnessof Al–Sc–Zr alloy was maintained for a relatively longer period for producing better thermal stability. Three-dimensionalatomic probing indicated that the precipitation of Zr in the precipitate at the initial stage of aging which can inhibit thegrowth of the precipitate’s size. TEM results showed that the Al–Sc–Zr alloy formed two precipitates of different sizes atthe over-aging phase after the peak state of hardness.

한국문화중의 비언어 커뮤니케이션 및 교육 방안 시론

黃進財 ( Huang Jincai ),朱文清 ( Zhu Wenqing ) 중국한국(조선)어교육연구학회 2023 한국(조선)어교육연구 Vol.21 No.0

the nonverbal communication plays an very important role in communication behavior of human, and is dispensable in inter cultural communication. Although Chinese and Korean culture share many similarities, they have distinctive national and cultural features because of different geographical location and environment and historical development, which leads to differences in nonverbal communication behavior of two countries. Therefore, the understanding and studying of nonverbal communication shouldn’t be neglected when we learn verbal communication. This article analyses the nonverbal communication behaviors in Korean culture, and puts forward the teaching strategy of nonverbal communication, which is of importance in inter cultural communication.

Characteristics of Solid-state Fermented Feed and its Effects on Performance and Nutrient Digestibility in Growing-finishing Pigs

Hu, Jiankun,Lu, Wenqing,Wang, Chunlin,Zhu, Ronghua,Qiao, Jiayun Asian Australasian Association of Animal Productio 2008 Animal Bioscience Vol.21 No.11

This study investigated the effects of solid-state fermentation of a compound pig feed on its microbial and nutritional characteristics as well as on pig performance and nutrient digestibility. A mixed culture containing Lactobacillus fermentum, Saccharomyces cerevisae and Bacillus subtilis was used for solid-state fermentation and solid-state fermented feed samples were collected on days 0, 1, 2, 3, 5, 7, 10, 15, 20 and 30 for microbial counts and chemical analysis. Lactic acid bacteria increased rapidly during the first three days of fermentation and then slowly declined until day 10 and, thereafter, the counts were maintained at about 6.7 log cfu/g for the duration of the fermentation period. Enterobacteria also increased during the first two days, and then fell below the detectable level of the analysis (3.0 log cfu/g). The pH of the fermentation substrate declined from 6.1 at the start of fermentation to 5.7 by day 30. The water-soluble protein content increased from 8.2 to 9.2% while the concentration of acetic acid increased from 16.6 to 51.3 mmol/kg over the 30-day fermentation. At the end of the 30-day fermentation, the solid-state fermented feed was used in a pig feeding trial to determine its effects on performance and nutrient digestibility in growing-finishing pigs. Twenty crossbred barrows ($14.11{\pm}0.77kg\;BW$) were allotted into two dietary treatments, which comprised a regular dry diet containing antibiotics and a solid-state fermented feed based diet, free of antibiotics. There was no difference due to diet on pig performance or nutrient digestibility. In conclusion, solid-state fermentation resulted in high counts of lactic acid bacteria and low counts of enterobacteria in the substrate. Moreover, feeding a diet containing solid-state fermented feed, free of antibiotics, can result in similar performance and nutrient digestibility in growing-finishing pigs to a regular diet with antibiotics.

RGB tricolor produced by white-based top-emitting organic light-emitting diodes with microcavity structure

Jin Cao,Xiang Liu,M.A. Khan,WenQing Zhu,XueYin Jiang,ZhiLin Zhang,ShaoHong Xu 한국물리학회 2007 Current Applied Physics Vol.7 No.3

RGB pixels by microcavity top-emitting organic light-emitting diode (TOLED) is benecial to both minimizing the loss of light andimproving the color purity and the eciency. Based on the multi-emitting layers, white organic light-emitting diodes (OLEDs) andmicrocavity TOLEDs were prepared. TOLEDs were fabricated using Ag/ITO as the reector and adjusting layer, Al/Ag as semi-trans-cavity and the color of the device have been changed. So we get RGB tricolor devices. The peak wavelengths are 476 nm, 539 nm,601 nm, Commission Internationale d’Eclairage (CIE) coordinates are (0.133,0.201), (0.335,0.567), (0.513,0.360), FWHM are 32 nm,50 nm, 73 nm for blue, green and red, respectively.

NOVEL HIERARCHICAL NANORODS OF SILICON-DOPED Bi2O2CO3 AND ITS PHOTOCATALYTIC ACTIVITY

Peng Sun,MINDONG CHEN,YUNXUAN ZHAO,JUAN XU,WENQING YAO,YONGFA ZHU,FEI TENG,YUJIAN JIN 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.8

The silicon-doped Bi2O2CO3 nanorods with the interesting hierarchical structure are synthesized by a simple hydrothermal method. The samples are characterized by XRD, X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), high-resolution transmission electron microscopy (HRTEM), Ultraviolet-visible diffuse refectance spectra (UV-DRS) and nitrogen sorption isotherms. It is found that with the increase of silicon content, the XRD peak of the sample significantly shifts toward a low diffraction angle and the particle morphologies change from nanosheets, nanoflowers to hierarchical nanorods. Moreover, the silicon-doped Bi2O2CO3 hierarchical nanorods exhibit improved photocatalytic degradation activities for different types of dyes under simulated solar light irradiation. The improved activity has been mainly attributed to the unique hierarchical nanorods structure and the formation of Si–O–Bi bonds.

Red organic light-emitting devices based on a pentacene derivative

Xiangdong Luo,Hong Gu,Bangdong Ding,Li Wang,Xiaowen Zhang,Wenqing Zhu,Xueyin Jiang,Zhilin Zhang 한국물리학회 2011 Current Applied Physics Vol.11 No.3

A more steric hindrance pentacene derivative, 6,13-di-(3,5-diphenyl) phenylpentacene (PDT) is synthesized in this experiment. And this manuscript presents the red emission organic light-emitting devices based on tris-(8-hydroxy- quinolinato) aluminum (Alq_3) co-doped with 6,13-di-(3,5-diphenyl) phenylpentacene (PDT), and 5,6,11,12-tetraphenylnaphthacene (rubrene). By measuring and analyzing the intensity of red emission and Commission Internationale de l’Eclairage (CIE) coordinates of the devices with different rubrene concentrations and thicknesses of active layer, an optimized structure of [ITO/TPD (50 nm)/Alq_3: 3mol%PDT:1mol%rubrene(60 nm)/Bphen(25 nm)/LiF/Al] is obtained. The experimental results suggest that rubrene assists energy transfer from Alq3 to PDT in composite of Alq_3:PDT:rubrene,which results in relatively pure red emission. A red emission with chromaticity coordinates (x = 0.61,y = 0.37) is also obtained with the emitting layer of [Alq_3:3 mol% PDT:1 mol% rubrene] within the driving current density range of 12―120 mA/cm^2. A maximum luminance efficiency of 2.4 cd/A is measured at current density of 120 mA/cm^2 and high brightness of 2894 cd/m^2.