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Size-Dependent Thermodynamic Properties of the Reaction of Nano-ZnO with Benzoic Acid
Shuting Wang,Zixiang Cui,Yongqiang Xue 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.7
Studying the thermodynamic properties of the reaction of nanoparticle with organic substance is significant for the application of nanomaterial in organic fields. In this work, by using the reaction of nano-ZnO with different particle sizes with benzoic acid as a research system, the size-dependent standard equilibrium constant and reaction thermodynamic properties were analyzed theoretically, and the influence regularities of the particle size on the standard equilibrium constant and the reaction thermodynamic properties were studied. The excellent agreement between the experimental results and theoretical analysis shows that the particle size has remarkable influence on the standard equilibrium constant and the thermodynamic properties of the reaction; with the decrease of the particle size, the standard equilibrium constant increases, while the standard molar reaction Gibbs energy, the standard molar reaction enthalpy and the standard molar reaction entropy decrease. Furthermore, the logarithm of the standard equilibrium constant and the thermodynamic properties present linear relations with the reciprocal of the particle diameter, respectively. The theory and the influence regularities will provide useful tools to lead better and broader application of nanomaterial in organic fields.
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Shuting Zhang,Guangwei Li,Liming Chen,Kiyoshi Toda 한국생물공학회 2004 Biotechnology and Bioprocess Engineering Vol.9 No.6
In the course of anaerobic storage of excess sludge, odors due to chemicals such as hydrogen sulfide are produced. These odors cause many problems. Many methods have been developed to eliminate odors, but all current methods are not only costly, but also largely ineffective. In this paper, we investigate the process of transformation of sludge microorganism cultures through intense aeration under nutrient-poor conditions, in terms of the selective adjustment and control of microorganism culture. The aerated sludge is subsequently returned to the adjusting pool, where the microorganisms inhibit odors, thus the excess sludge itself will act as an odor inhibitor. The process can be verified in terms of viability, in that the degradation capacity of the sludge was maintained after the intensely-aerated sludge was returned to the treatment system.
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Shuting Zhuang,Yanan Yin,Jianlong Wang 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.1
Chitosan was modified by gamma radiationeinduced grafting with maleic acid and then used for theremoval of cobalt ions from aqueous solutions. Chitosan-g-maleic acid was characterized by FourierTransform infrared spectroscopy (FT-IR). The effect of the dose (1e5 kGy) and monomer concentration(0.3e1.3%, m/v) on the grafting ratio was examined. The adsorption kinetics and isotherms were alsoinvestigated. The results showed that the optimal dose for grafting was 2 kGy. When monomer concentrationwas within the range of 0.3e1.3% (m/v), the grafting ratio increased almost linearly. For theadsorption of cobalt ions by chitosan-g-maleic acid beads, the pseudo second-order kinetic model(R2 ¼ 0.99) and Temkin isotherm model (R2 ¼ 0.96) were able to fit the experimental data reasonablywell. The equilibrium adsorption capacity of cobalt ions increased from 2.00 mg/g to 2.78 mg/g afterchitosan modification
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Shuting Yu HONG KONG ACADEMY OF SOCIAL SCIENCES 2024 Journal of Social Science Development Research Vol.1 No.2
With the development of higher education and social changes, college English courses no longer only focus on the cultivation of language skills, but also pay more attention to the comprehensive quality cultivation of students. As an important educational tool, the construction and practice of ideological and political education in college English classrooms are of great importance and challenge. This article aims to explore the construction and practice of ideological and political education in college English classrooms, analyzing the construction of teaching staff, curriculum design, textbook selection, teaching methods and means, and other aspects. Firstly, the cultivation of teaching staff is the key to ensuring the quality of ideological and political education, and it is necessary to improve teachers* ideological and political literacy and abilities. Secondly, the curriculum and textbook selection should focus on ideological and political related topics and texts to stimulate students* thinking on social ethics, politics, and other issues. At the same time, teaching objectives should focus on cultivating students* correct political concepts and values. Finally, the textbook content and courseware should have an ideological and political orientation, incorporating in-depth analysis and exploration of social issues. Through the above measures, we can effectively construct ideological and political education in college English classrooms, and achieve the cultivation of students* comprehensive qualities.
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Shuting Wan,Lifeng Cheng,Xiaoling Sheng 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.2
The effects of wind shear and the tower shadow contribute to periodic fluctuations in the wind speed and aerodynamic torque, which cause several problems. This study develops an equivalent wind speed model for large-scale, n-bladed wind turbines that includes the wind shear and the tower shadow effects. The comprehensive model is used to derive the disturbance components of wind speed caused by wind shear, the tower shadow, their synthesis, and the equivalent wind speed and to delineate their spatial distributions in the rotor disk area. Simulation results reveal that the effects of wind shear, the tower shadow, and the equivalent wind speed on the disturbance components fluctuate periodically and are closely related to the wind turbine correlation parameters, such as the rotor radius, hub center height, tower radius, distance from the tower midline to the blade, wind shear exponent, and blade number.
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Compound fault diagnosis of bearings using improved fast spectral kurtosis with VMD
Shuting Wan,Xiong Zhang,Longjiang Dou 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.11
The fast spectrum kurtosis (FSK) algorithm can adaptively identify resonance bands of a signal, and fault characteristics can be extracted by analyzing the selected frequency bands. However, in practical applications, the bearing failure may be composed of various faults (inner ring/outer ring/rolling element) and the faults may be located in different resonant bands. Due to the interference between different fault components and noise, the weak components may be submerged when FSK is used to deal with compound fault signals. To improve the accuracy of an FSK processing compound fault located in different resonance bands, an improved FSK method combined with the variational mode decomposition (VMD) is proposed. First, the parameters (number of components K / penalty factor a ) in the VMD decomposition are selected, and the original compound fault signal is preprocessed by VMD decomposition, so that the original signal is decomposed into K variational intrinsic mode function (VIMF) components. The resonance center bands of these signals are different from each other, so the different fault information is located in different VIMF. Finally, each VIMF component is calculated by FSK. Through the simulated and experimental analysis, the method can accurately identify the resonance bands, and identify the weak fault characteristics of compound bearing fault.
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Shuting Liu,Hangfeng He,Wenhai Qi,Kaibo Shi 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.4
This paper deals with asynchronous control for discrete-time switched time-delay system with persistent dwell-time (PDT). The mode-dependent PDT switching is adopted, which is more general than average dwell time switching. Moreover, to deal with the mode-dependent delay in mode identification and signal transmission, the asynchronous phenomenon between controllers and subsystems is considered. A new mode-dependent Lyapunov function is constructed, which is suitable to the asynchronous PDT switching. Then, the sufficient condition for globally uniformly asymptotically stable (GUAS) of the discrete-time switched time-delay system is proposed. Further, the asynchronous controller and switching law are designed such that the closed-loop system is GUAS. Finally, an application example of water pollution is given to show the effectiveness of the proposed method.
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Shuting Wan,Bo Peng 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.1
Compound fault features of the rolling bearing are difficult to separate and extract. To address this problem, the present paper proposed a diagnosis algorithm, namely FERgram, on the base of maximal overlap discrete wavelet packet transform (MODWPT) and fault energy ratio (FER). First, a group of frequency band signals are gained after MODWPT processing the initial vibration signal. Second, FER is chosen as the evaluation index, and then the FER values of each frequency band signal are calculated and used to generate FERgram. The frequency band signal with the maximum FER value containing plentiful fault information is chosen for envelope analysis. Finally, the fault type is determined by contrasting the prominent frequency component of the envelope spectrum with the fault feature frequency. The feasibility and superiority of the FERgram method are verified by four signals and four comparison methods. The results show that the FERgram method can effectively extract and accurately diagnose the compound fault of rolling bearing.
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