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Yang Guoqiang,Guo Gang,Wang Lihui,Wang Changchang,Sun Tao 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.3
In this paper, wet shotcrete spraying experiments were carried out under different temperature and humidity conditions withdifferent dosage of metakaolin (MK) and different length of polyvinyl alcohol fiber (PVA fiber). And the influence of differentcontent of metakaolin and different length of PVA fiber on the compressive strength of tidal shotcrete under different curingconditions was explored. The results show that the compressive strength of shotcrete increases first and then decreases withthe increase of MK content and PVA fiber length under the curing condition of normal temperature and constant humidity. However, under the curing condition of high temperature and humidity, the compressive strength of shotcrete tended toincrease with the increase of MK content. Under the condition of high temperature and high humidity curing, the compressivestrength of shotcrete is lower than that of shotcrete under normal temperature and constant humidity curing. This study canprovide theoretical support for the application of sprayed concrete in different environments.
Guoqiang Yang,Shali Xiao,Yuedong Ma,Liuqiang Zhang 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.4
A capacitive Frisch-grid CdZnTe detector with different lengths of the Frisch rings has beenfabricated, and the influence of infrared (IR) stimulation on the spectral performance of the detectorhas been investigated. IR stimulation at a wavelength (940 nm), close to the absorption edge ofthe CdZnTe, was found to improve the detector’s spectral performance significantly. IR radiationwas noted to influence the detector’s sensitivity, changing the equilibrium between free and trappedcarriers and improving the charge collection. The degree of improvement was different for detectorswith different lengths of the Frisch rings and depended on the weighting potential distribution andthe IR illumination intensity. For example, improvement was obtained in the energy resolution(FWHM) at 662 keV from 3.3% without illumination to 2.3% with a low intensity (120 μW) of IRillumination for the capacitive Frisch-grid CdZnTe detector with an 8-mm-long Frisch ring. Goodenergy resolution could be obtained even at low operating voltages.
Guoqiang Zhao,Hao Wu,Yangyuan Li,Li Li,Jiajun He,Xinjian Yang,Xiangxue Xie Asian Australasian Association of Animal Productio 2024 Animal Bioscience Vol.37 No.1
Objective: The objective of this study was to investigate how cellulase or/and lactic acid bacteria (LAB) affected the fermentation characteristic and microbial community in wet brewer's grains (WBG) and corn stover (CS) mixed silage. Methods: The WBG was mixed thoroughly with the CS at 7:3 (w/w). Four treatment groups were studied: i) CON, no additives; ii) CEL, added cellulase (120 U/g fresh matter [FM]), iii) LAB, added LAB (2×10<sup>6</sup> cfu/g FM), and iv) CLA, added cellulase (120 U/g FM) and LAB (2×10<sup>6</sup> cfu/g FM). Results: All additive-treated groups showed higher fermentation quality over the 30 d ensiling period. As these groups exhibited higher (p<0.05) LAB counts and lactic acid (LA) content, along with lower pH value and ammonia-nitrogen (NH<sub>3</sub>-N) content than the control. Specifically, cellulase-treated groups (CEL and CLA) showed lower (p<0.05) neutral detergent fiber and acid detergent fiber contents than other groups. All additives increased the abundance of beneficial bacteria (Firmicutes, Lactiplantibacillus, and Limosilactobacillus) while they decreased abundance of Proteobacteria and microbial diversity as well. Conclusion: The combined application of cellulase and LAB could effectively improve the fermentation quality and microbial community of the WBG and CS mixed silage.
Exploring the Fuel Economy Potential of ISG Hybrid Electric Vehicles through Dynamic Programming
Guoqiang Ao,Hu Zhong,Jiaxi Qiang,Lin Yang,Bin Zhuo 한국자동차공학회 2007 International journal of automotive technology Vol.8 No.6
Hybrid electric vehicles (HEV) combined with more than one power sources have great potential to improve fuel economy and reduce pollutant emissions. The Integrated Starter Generator (ISG) HEV researched in this paper is a two energy sources vehicle, with a conventional internal combustion engine (ICE) and an energy storage system (batteries). In order to investigate the potential of diesel engine hybrid electric vehicles in fuel economy improvement and emissions reduction, a Dynamic Programming (DP) based supervisory controller is developed to allocate the power requirement between ICE and batteries with the objective of minimizing a weighted cost function over given drive cycles. A fuel-economy-only case and a fuel & emissions case can be achieved by changing specific weighting factors. The simulation results of the fuel-economy-only case show that there is a 45.1% fuel saving potential for this ISG HEV compared to a conventional transit bus. The test results present a 39.6% improvement in fuel economy which validates the simulation results. Compared to the fuel-economy-only case, the fuel & emissions case further reduces the pollutant emissions at a cost of 3.2% and 4.5% of fuel consumption with respect to the simulation and test result respectively.
Guoqiang Xie,Liejia Qian,Heyuan Zhu,Hua Yang 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.4
We demonstrate a diode-pumped femtosecond Nd:glass laser with an enhanced repetition rate for the first time. A coupled cavity is employed to initiate the generation of multiple pulses with equal temporal intervals inside the main cavity. Stable pulse trains with a doubled repetition rate have been obtained successfully. Extension of the approach to a higher repetition rate is quite feasible, and a tripled repetition rate, i.e., 300 MHz, has been observed experimentally.
( Guoqiang Zhao ),( Hao Wu ),( Li Li ),( Jiajun He ),( Zhichao Hu ),( Xinjian Yang ),( Xiangxue Xie ) 한국축산학회 2021 한국축산학회지 Vol.63 No.6
This study investigated the effects of applying cellulase and starch on the fermentation characteristics and microbial communities of Napier grass silage after ensiling for 30 d. Three groups were studied: No additives (control); added cellulase (Group 1); and added cellulase and starch (Group 2). The results showed that the addition of cellulase and starch decreased the crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF) and pH significantly (p < 0.05) and increased water-soluble carbohydrate (WSC) content (p < 0.05). The addition of additives in two treated groups exerted a positive effect on the lactic acid (LA) content, lactic acid bacteria (LAB) population, and lactic acid / acetic acid (LA/AA) ratio, even the changes were not significant (p > 0.05). Calculation of Flieg’s scores indicated that cellulase application increased silage quality to some extent, while the application of cellulase and starch together significantly improved fermentation (p < 0.05). Compared with the control, both additive groups showed increased microbial diversity after ensiling with an abundance of favorable bacteria including Firmicutes and Weissella, and the bacteria including Proteobacteria, Bacteroidetes, Acinetobacter increased as well. For alpha diversity analysis, the combined application of cellulase and starch in Group 2 gave significant increases in all indices (p < 0.05). The study demonstrated that the application of cellulase and starch can increase the quality of Napier grass preserved as silage.
Service life prediction of chloride-corrosive concrete under fatigue load
Yang, Tao,Guan, Bowen,Liu, Guoqiang,Li, Jing,Pan, Yuanyuan,Jia, Yanshun,Zhao, Yongli Techno-Press 2019 Advances in concrete construction Vol.8 No.1
Chloride corrosion has become the main factor of reducing the service life of reinforced concrete structures. The object of this paper is to propose a theoretical model that predicts the service life of chloride-corrosive concrete under fatigue load. In the process of modeling, the concrete is divided into two parts, microcrack and matrix. Taking the variation of mcirocrack area caused by fatigue load into account, an equation of chloride diffusion coefficient under fatigue load is established, and then the predictive model is developed based on Fick's second law. This model has an analytic solution and is reasonable in comparison to previous studies. Finally, some factors (chloride diffusion coefficient, surface chloride concentration and fatigue parameter) are analyzed to further investigate this model. The results indicate: the time to pit-to-crack transition and time to crack growth should not be neglected when predicting service life of concrete in strong corrosive condition; the type of fatigue loads also has a great impact on lifetime of concrete. In generally, this model is convenient to predict service life of chloride-corrosive concrete with different water to cement ratio, under different corrosive condition and under different types of fatigue load.
Modeling of Chloride Ion Diffusion in Concrete under Fatigue Loading
Tao Yang,Bowen Guan,Guoqiang Liu,Yanshun Jia 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.1
It is common for reinforced concrete in the saline region to bear fatigue loading and chloride induced corrosion, which has become one of the main causes of structural failure of reinforced concrete. The objective of this paper is to investigate the characteristics of chloride ion transport in concrete under fatigue loading. A new theoretical model describing the chloride ion transport in saturated concrete under fatigue loading is proposed. In this model, the concrete is divided into two parts, matrix and microcrack, to characterize the chloride diffusion coefficient of concrete based on crack area. The influence of fatigue damage on the microcrack area of concrete is quantitatively analyzed and the relationship between fatigue loading and chloride diffusion coefficient is established. Then, based on Fick’s second law, the model is proposed and solved by analytical solution. Some experiments are conducted to verify the proposed model and the simulated and measured results are in good agreement with each other. Finally, the characteristics of chloride ion transport under different influencing factors are analyzed using the proposed model.