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Near-infrared Detection of Straw Cellulose by Orthogonal Signal Correction and Partial Least Squares
Qingming Kong,Zhongbin Su,Weizheng Shen,Mingming Han,Bohan Li,Xudong Wang 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.5
Orthogonal signal correction (OSC)and partial least squares(PLS)were used during the pretreatment of straw to reduce environmental noise and prediction models were established for near-infrared detection of straw cellulose. Tests were run with soybean stalk as the object of study. Test results indicated that compared to a model established using a traditional denoising method, the determination coefficients for calibration set models established by second derivative+smoothing and OSC were 0.9318595 and 0.9328905 respectively while the root mean square error for calibration (RMSEC) were 0.6762902 and 0.6696454. For an OSC-PLS regression model with a factor of 8, the relative standard deviation of a prediction model was less than 5%. In the OSC denoising process, the root mean square error fluctuated with the increasing number of PLS factors. Compared to the second derivative-smoothing denoising, OSC-PLS denoising removed the non-correlated variation from spectra and improved interpretation ability of variation while the analysis and convergence were expedited. It was therefore concluded that OSC-PLS denoising could be used to realize the rapid and accurate near-infrared detection of straw cellulose.
Qingming Cao,Jianye Yan,Zhicheng Sun,Limin Gong,Hongnian Wu,Shihan Tan,Yating Lei,Bo Jiang,Yuanqing Wang 한국식품과학회 2021 Food Science and Biotechnology Vol.30 No.1
The asparagus of Triarrhena lutarioriparia (TL)is a popular vegetable with abundant chemical compoundsin China. This study aims to optimize the ultrasound-assistedextraction (UAE) method for its content of totalflavonoid and antioxidant activities by response surfacemethodology (RSM). Box-Behnken design was adopted toevaluate the influences of ethanol concentration, extractiontime and solvent-to-sample ratio on the extraction yield oftotal flavonoid and the antioxidant activity. Considering themaximum content of extracted total flavonoids andantioxidant activity, the optimal extraction conditions wereacquired with 70% (v/v) ethanol by UAE for 60 min at asolvent-to-sample ratio of 40 mL/g. The proportion of theextraction of total flavonoid was 15.88 mg/g and antioxidantactivity reached 79.53%. The RSM would be recommendedas an appropriate model for simultaneousoptimization of the UAE conditions for the content of totalflavonoid and the antioxidant activity of asparagus of TL.
Modeling and Control of a Magnus-effect-based Ducted Fan Aerial Vehicle
Qingming Hou,Hongzhe Jin,Yanhe Zhu,Yongsheng Gao,Jie Zhao 제어·로봇·시스템학회 2015 International Journal of Control, Automation, and Vol.13 No.4
A ducted fan aerial vehicle model using Magnus effect steering engine is proposed in this paper. This model utilizes a steering engine that comprises four cylinders that are symmetrically installed at the aft inside the duct. Interaction between the spinning cylinder surface and the duct jet flow causes the aerodynamic lift proportional to angular velocity of the cylinder. Therefore, operating range of the aerodynamic lift is guaranteed to be sufficiently wide. The efficiency of the proposed method is confirmed via numerical simulations on integrated flight dynamics developed in this study.
Triggering One-Dimensional Phase Transition with Defects at the Graphene Zigzag Edge
Deng, Qingming,Zhao, Jiong American Chemical Society 2016 NANO LETTERS Vol.16 No.2
<P>One well-known argument about a one-dimensional (1D) system is that 1D phase transition at finite temperature cannot exist even though this concept depends on conditions such as range of interaction, external fields, and periodicity. Therefore, 1D systems usually have random fluctuations with intrinsic domain walls arising that naturally bring disorder during transition. Herein, we introduce a real 1D system in which artificially created defects can induce a well-defined ID phase transition. The dynamics of structural reconstructions at graphene zigzag edges are examined by in situ aberration-corrected transmission electron microscopy. Combined with an in-depth analysis by ab initio simulations and quantum chemical molecular dynamics, the complete defect induced 1D phase transition dynamics at graphene zigzag edge is clearly demonstrated and understood on the atomic scale. Further, following this phase transition scheme, graphene nanoribbons (GNR) with different edge symmetries can be fabricated and, according to our electronic structure and quantum transport calculations, a metal-insulator-semiconductor transition for ultrathin GNRs is proposed.</P>
Deng, Qingming,Thi, Quoc Huy,Zhao, Jiong,Yun, Seok Joon,Kim, Hyun,Chen, Guibin,Ly, Thuc Hue American Chemical Society 2018 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.122 No.6
<P>The polar edges of two-dimensional monolayer transition metal dichalcogenides (TMD) and their alloys are examined by combined theoretical (density functional theory) and experimental approaches. For these polar edges, the growth reaction energies between different edge terminations are considered instead of the surface free energies. Due to different energy evolutions during growth on the zigzag edges between MoS<SUB>2</SUB> and WS<SUB>2</SUB>, the S-ZZ edges in the WS<SUB>2</SUB> monolayer flakes more easily decompose into sawtooth-like edges in M-ZZ type as compared to the MoS<SUB>2</SUB> monolayer; thus, the hexagonal morphology can be seen more often in WS<SUB>2</SUB>. Moreover, the observed anisotropic short-range order in the MoS<SUB>2</SUB>/WS<SUB>2</SUB> alloys is originated from the freezed edge configurations during growth, explainable by the growth kinetics and thermodynamics of the Mo-ZZ-edges. The determination of the growing edge terminations is of great importance for the controllable synthesis of the emergent two-dimensional TMD materials.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2018/jpccck.2018.122.issue-6/acs.jpcc.7b09332/production/images/medium/jp-2017-09332a_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp7b09332'>ACS Electronic Supporting Info</A></P>
He, Qingming,Zhang, Yijun,Liu, Zhouyu,Cao, Liangzhi,Wu, Hongchun Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.2
A new task of using the Jacobian-Free-Newton-Krylov (JFNK) method for the PWR core transient simulations involving neutronics, thermal hydraulics and mechanics is conducted. For the transient scenario of PWR, normally the Picard iteration of the coupled coarse-mesh nodal equations and parallel channel TH equations is performed to get the transient solution. In order to solve the coupled equations faster and more stable, the Newton Krylov (NK) method based on the explicit matrix was studied. However, the NK method is hard to be extended to the cases with more physics phenomenon coupled, thus the JFNK based iteration scheme is developed for the nodal method and parallel-channel TH method. The local gap conductance is sensitive to the gap width and will influence the temperature distribution in the fuel rod significantly. To further consider the local gap conductance during the transient scenario, a 1D mechanics model is coupled into the JFNK scheme to account for the fuel thermal expansion effect. To improve the efficiency, the physics-based precondition and scaling technique are developed for the JFNK iteration. Numerical tests show good convergence behavior of the iterations and demonstrate the influence of the fuel thermal expansion effect during the rod ejection problems.