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Yuanyuan Niu,Ruijuan Jia,Chenglin Liu,Xiuli Han,Chun Chang,Junying Chen 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.8
Green synthesis of metal nanoparticles using plant extracts as an effective bio-reducing reagent has attracted considerable attention. Fe/Cu nanocomposites synthesized by extracts of sweet potato leaves served to remove basic magenta (BM) from aqueous solution. The adsorption operation conditions of BM on Fe/Cu nanocomposites were optimum by Box-Behnken design (BBD) model of response surface methodology (RSM). The adsorption equilibrium data were well described by the Sips and Redlich-Peterson models. The thermodynamic studies showed that the adsorption process was endothermic and spontaneous. The maximum adsorption capacity from the Sips model was 235.92mg/g at 298 K, which indicated that Fe/Cu nanocomposites had potential application in wastewater treatment. As indicated by pseudo-second order kinetics model, the adsorption of BM onto Fe/Cu nanocomposites could be achieved through the complexation, H-bonding, - adsorbate-adsorbent interaction, and electrostatic interaction at different pH values
A novel fault diagnosis method based on EMD, cyclostationary, SK and TPTSR
Yijie Niu,Jiyou Fei,Yuanyuan Li,Deng Wu 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.5
A novel method based on empirical model decomposition (EMD), cyclostationary, spectral kurtosis (SK) and two-phase test sample sparse representation (TPTSR), called ECK-TPTSR is proposed for fault diagnosis in this paper. In the ECK-TPTSR method, the vibration signal is decomposed into several components by EMD. Then each component can be modelled as cyclostationary for noise reduction. Next, the proposed method computes the kurtosis of the unbiased autocorrelation on the squared envelope of each component, and extracts the component with the highest kurtosis. Finally, the extracted component is used to construct training samples and test samples, which are input into the TPTSR classifier to fulfill fault classification accurately. Moreover, the experimental results indicate that the ECK-TPTSR method can effectively achieve fault diagnosis of motor bearing and obtain higher classification accuracy.
Mean Square Detectability of LTI Systems over Finite-State Digital Block-Fading Channels
Wei Chen,Yuanyuan Zou,Nan Xiao,Yugang Niu 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.2
This paper studies the mean square quadratic (MSQ) detectability for multi-output networked systemsover finite-state digital block-fading channels. The packet-loss rate of each digital fading channel depends on thechannel power gain, as well as packet length and power level used for transmission. A finite-state random processis introduced to model time-varying fading channels, which characterizes various configurations of physical communicationenvironment and/or different channel fading amplitudes. Necessary and sufficient conditions for MSQdetectability over finite-state Markov digital block-fading channels are given in the form of algebraic Riccati equationsor linear matrix inequalities (LMIs). The estimation gain is given as a function of estimated/observed channelstate. In addition, explicit conditions on network for MSQ detectability over finite-state independent identicallydistributed (i.i.d.) digital block-fading channels are presented in terms of the unstable poles of the multi-outputplant. Finally, an application to Gilbert-Elliott channels (GECs) is provided to demonstrate the derived results.
Polydopamine Used as Hollow Capsule and Core-Shell Structures for Multiple Applications
Xinyu Cui,Yuanyuan Yin,Zuo Ma,Yongkui Yin,Yue Guan,Shengzhong Rong,Jinxia Gao,Yingying Niu,Miaojing Li 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.5
Polydopamine (PDA) capsule and core – shell structures with tailored structures and properties are of particular interests due to their multifunctions and potential applications as new colloidal structures in diverse fields. Among the available fabrication methods, PDA film onto colloidal particles followed by selective template removal has attracted extensive attention due to its advantages of precise control over the size, wall thickness and functions of the obtained capsules. The past several years has witnessed a rapid increase of research concerning the new fabrication strategies, functionalization and applications of this kind of capsules and core – shell structures, particularly in many fields such as drug delivery, catalysis, antibacterial, etc. In this review, the very recent progress of the capsule and core – shell structures based on PDA are summarized. There are basically two sections, including the fabrication process of PDA capsules, core – shell structures, and the various applications based on PDA.
Sliding Mode Control for Uncertain Switched Systems Subject to Actuator Nonlinearity
Yonghui Liu,Yugang Niu,Yuanyuan Zou 제어·로봇·시스템학회 2014 International Journal of Control, Automation, and Vol.12 No.1
This paper considers the problem of sliding mode control for a class of uncertain switched systems subject to sector nonlinearities and dead-zone. In the control systems, each subsystem is not required to share the same input channel, which is usually assumed in the previous works. By employing a weighted sum of the input matrices, a common sliding surface is designed and the corresponding sliding mode dynamics is obtained. A switching signal based on the average dwell time strategy is fur-ther proposed to ensure the exponential stability of the sliding mode dynamics. Moreover, it is shown that the reachability of the specified sliding surface can be ensured despite the presence of actuator nonlinearity, parameter uncertainties and external disturbances. Finally, a numerical example is given to demonstrate the effectiveness of the proposed method.
Qingxiang Yang,Jia Wang,Xinkuan Han,Yuanyuan Xu,Dong Liu,Hongxin Hao,Xuemei L,Yuhui Guo,Tianqi Niu,Shiyue Qi 한국생물공학회 2014 Biotechnology and Bioprocess Engineering Vol.19 No.1
In this study, the bacterial dynamics andstructure compositions in the two-stage biological processof a full-scale printing and dyeing wastewater (PDW)treatment system were traced and analyzed by terminalrestriction fragment length polymorphism (T-RFLP) and454 pyrosequencing techniques. T-RFLP analysis showedthat the microbial communities experienced significantvariation in the process of seed sludge adaptation to thePDW environments and were in constant evolution duringthe whole running period of the system, despite theconstant COD and color removal effects. Pyrosequencingresults indicated that the two-stage biological systemharbored rather diverse bacteria, with Proteobacteria beingthe predominant phylum during the steady running period,although its microbial compositions differed. The firststageaerobic tank was dominated by α-Proteobacteria(89.05% of Proteobacteria), whereas in the second-stageaerobic tank, β- and γ-Proteobacteria, besides α-Proteobacteria,were the dominant bacterial populations.
Guoqiang Fan,Xiaoqiao Zhai,Suyan Niu,Yuanyuan Ren 한국유전학회 2016 Genes & Genomics Vol.38 No.8
Polyploid breeding is an effective method that has been used widely for the development of new varieties of plants. MicroRNAs (miRNAs) are a class of endogenous small RNAs that regulate gene expression at the posttranscriptional level. To understand the functions of miRNAs in autotetraploid and diploid Paulownia ‘Yuza 1’ plants, two small RNA libraries and two degradome sequencing libraries of the autotetraploid and the corresponding diploid plants were constructed and analyzed. A total of 49 conserved miRNAs that were grouped into 15 families, and 25 novel miRNAs were obtained from two sRNA libraries. Among these miRNAs, 28 were differentially expressed at a significant level in the autotetraploid relative to the diploid. Moreover, the miRNA target genes were identified by degradome sequencing and some of the differently expressed miRNAs and their target genes were validated by quantitative RT-PCR analysis. This study has provided valuable information on P. ‘Yuza 1’ miRNAs and their targets, which will enrich the Paulownia miRNA information resources and will contribute to our understanding of miRNA-mediated regulation in autotetraploid Paulownia plantlets.
Yuan Jing,Chunwei Zhang,Su Zhang,Guangyi Lin,Huidong Cao,Jiahui Wen,Zonglong Wang,Yuanyuan Niu,Zetao Lin 한국고분자학회 2023 폴리머 Vol.47 No.6
The application of vegetable oil-based softeners canola oil and cottonseed oil in Solution polymerized styrene-butadiene rubber (SSBR) system composites was investigated. The results showed that when the aromatic oil was replaced by 5 parts of vegetable oil-based softeners in equal amounts in the base formulation of SSBR system, the work-ing performance of the rubber was better, the tear strength and elongation at break were improved and the tensile strength was reduced; the vulcanization time of the rubber prepared with vegetable oil-based softeners was significantly reduced compared with that of aromatic oil; the glass transition temperature of the rubber was significantly reduced and the cold resistance and snow performance of the rubber were improved.