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Hydrogen production by catalytic steam reforming of waste cooking oil over La-Ni/ZSM-5 catalyst
Xiao Na,Zhao Rui,Liu Yufei,Zhan Wei,Xu Yonghui,Wu Zhengshun 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.9
Ni/ZSM-5 catalyst is one of the promising catalysts to improve the catalytic steam reforming of waste cooking oil (WCO) for hydrogen production. Furthermore, the introduction of lanthanum (La) plays a huge role in inhibiting metal sintering and carbon deposition and improving the stability and activity of the catalyst. This study investigated the effects of reaction temperature (600–800 °C), steam to carbon molar ratio (S/C), n Ni/ZSM-5 (n=5, 10, and 15 wt%), and the addition of promoter (La) on the experimentally generated hydrogen yield and carbon deposition. Results showed that the experiment used 6 wt% La-10 wt% Ni/ZSM-5 at 0.1 MPa, 700 °C, space-time (τ)=0.56 gcatalyst/gWCO, and S/C=5.25, which obtained the yield of H2 was 154.12 mol/kg, carbon deposition was 5.38%. Therefore, Ni-modified catalyst added La to improve the catalyst coking resistance and prevent carbon formation. Moreover, La can further promote the dispersion of nickel on the surface of the carrier and improve the catalytic performance of the catalyst for steam reforming reaction.
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QTL mapping of Fusarium wilt resistance in radish (Raphanus sativus L.)
Xiaona Yu,Su Ryun Choi,Yong Pyo Lim 한국육종학회 2015 한국육종학회 심포지엄 Vol.2015 No.07
Fusarium wilt (FW), caused by the soil-borne fungal pathogen Fusarium oxysporum is a serious disease in cruciferous plants, including the radish (Raphanus sativus). To identify quantitative trait loci (QTL) or gene(s) conferring resistance to FW, we constructed a genetic map of R. sativus using an F2 mapping population derived by crossing the inbred lines ‘835’ (susceptible) and ‘B2’ (resistant). A total of 220 markers distributed in 9 linkage groups (LGs) were mapped in the Raphanus genome, covering a distance of 1041.5 cM with an average distance between adjacent markers of 4.7 cM. Comparative analysis of the R. sativus genome with that of Arabidopsis thaliana and Brassica rapa revealed 21 and 22 conserved syntenic regions, respectively. QTL mapping detected a total of 8 loci conferring FW resistance that were distributed on 4 LGs, namely, 2, 3, 6, and 7 of the Raphanus genome. Of the detected QTL, 3 QTLs (2 on LG 3 and 1 on LG 7) were constitutively detected throughout the 2-years experiment. QTL analysis of LG 3, flanked by ACMP0609 and cnu_mBRPGM0085, showed a comparatively higher logarithm of the odds (LOD) value and percentage of phenotypic variation. Synteny analysis using the linked markers to this QTL showed homology to A. thaliana chromosome 3, which contains disease-resistance gene clusters, suggesting conservation of resistance genes between them.
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Evaluation of AC Resistance in Litz Wire Planar Spiral Coils for Wireless Power Transfer
Xiaona Wang,Pan Sun,Qijun Deng,Wengbin Wang 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.4
A relatively high operating frequency is required for efficient wireless power transfer (WPT). However, the alternating current (AC) resistance of coils increases sharply with operating frequency, which possibly degrades overall efficiency. Hence, the evaluation of coil AC resistance is critical in selecting operating frequency to achieve good efficiency. For a Litz wire coil, AC resistance is attributed to the magnetic field, which leads to the skin effect, the proximity effect, and the corresponding conductive resistance and inductive resistance in the coil. A numerical calculation method based on the Biot–Savart law is proposed to calculate magnetic field strength over strands in Litz wire planar spiral coils to evaluate their AC resistance. An optimized frequency can be found to achieve the maximum efficiency of a WPT system based on the predicted resistance. Sample coils are manufactured to verify the resistance analysis method. A prototype WPT system is set up to conduct the experiments. The experiments show that the proposed method can accurately predict the AC resistance of Litz wire planar spiral coils and the optimized operating frequency for maximum efficiency.
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Xiaona Huang,Hao Zhang,Xuguang Wang,Xiutian Yang,Rongzhuang Lin,Fan Zhang,Ying Liu,Kun Xu,Chao Zhou,Pixin Wang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-
During cementing construction, H2S gas leak from micro-cracks of cement ring or cementing interface,seriously damaging wellbore integrity and shortening the life of wells. Therefore, microcrack selfhealingcement technology is of great significance for oil wells to maintain the durability of cement ringsand adapt to complex underground environments. Herein, acrylamide (AM), acrylonitrile (AN) and Nvinylformamide(NVF) were used as functional monomers, and laponite was added to prepareLaponite-poly(acrylamide-acrylonitrile-n-vinylformamide) nanocomposite hydrogel (L-PMAN) withexcellent mechanical strength as micro-crack repair agent for gas-triggered cementing cement sheath. Considering the difference of chemical environment in the process of wellbore cement slurry sealingand subsequent micro-fracture plugging, different structural units were selected to design amphotericstructure. The construction of zwitterionic structure makes it exhibit excellent swelling behavior in saltsolution while maintaining 80% of the original mechanical strength. More importantly, after adding LPMANpowder,cement stone (C1) can achieve good repair of microcracks under the trigger of H2S within3 days, and the maximum gas breakthrough pressure can reach 2.5 MPa, indicating the great potentials ofthe L-PMAN for plugging microcracks in cement sheath.
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TEM Investigation of Nitrided Inconel 690 Prepared by Low Temperature Plasma Assisted Processes
Xiaona Li,Chuang Dong,Henry Michelh,Huan He,Shengzhi Hao,Thierry Czerwiec 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
Low-temperature plasma assisted nitriding (PAN) treatment was used to produce a highly nitrogen-enriched N layer on the nickel-based superalloy Inconel 690. Such a layer showed greatly improved wear and corrosion performance. In this paper, we investigate the microstructure of the N layers thoroughly by using transmission-electron microscopy and XRD. As a comparison, nitriding layers were also prepared by the reactive magnetron sputtering technique. It was found that the nitrogen-enriched ¯lm deposited at 400 ±C by RMS consists of mainly CrN-type nitride and fcc ° phase and a small amount of °N phase, while the PAN treatments at 400 ±C on bulk samples produce only N single-phase layer with gradually changing lattice parameters from the outermost surface to the underlying substrate in the range of 0.393 to 0.355 nm.
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Research on Imaging System of Artificial Compound-Eye and Moving Object Detection
Xiaona Ding 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.4
To solve the problem of moving object detecting in the wide field, this paper establishes a new artificial compound imaging system and proposes moving object detection algorithm. According to the unique principle of receiving and processing of visual information from animal compound-eye, the model of artificial imaging system consists of a micro-lens array and CCD device with planar array, captures dynamic image sequences in the different azimuth, and assures its advantages of long-distance and wide-range detection and good image effect. In order to get the motion vector of moving object, researches the characteristics of background in the relevant imaging sequence, discusses the mechanism of processing visual information, the estimation algorithm adopt the high-pass filter processing after making the three-dimensional space transformation to reduce the disturbance of noise and enhance the effect of background suppression firstly. The motion vectors of dynamic object is obtained by processing the relevant imaging sequence with the maximum correlation coefficient, refers to the EMD array. Preliminary experimental results for target tracking shown that the artificial compound imaging system and moving object detection algorithm is practical and effective, and which has a highly practical application value.
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Modified Power Prediction Model Based on Infinitesimal Cutting Force during Face Milling Process
Xiaona Luan,Song Zhang,Gang Li 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.5 No.1
Nowadays soaring energy price, increasing environmental concerns, and stringent legislations make energy saving very emergency and helpful both for enterprises and environment. To deal with these issues, this paper presents a generalized mathematical power prediction model of face milling process used in manufacturing. An attempt was made to develop a relatively precise and direct power consumption model to help researchers make power optimization much easier and more practical than before. First, an infinitesimal cutting force model was proposed based on theoretical and experimental foundations. Secondly, relationship between power consumption and cutting force components was revealed, and power consumption based on infinitesimal cutting forces during metal removal process was developed. Finally, the proposed model was experimentally verified by comparing predicted and measured power consumption. Both average and instantaneous values of power consumption were used to analyze prediction error of the model. This proposed model can be used to evaluate and optimize cutting power consumption once cutting parameters were decided based on minimal energy demand. Results showed that the mean errors of maximum power and mean power were 0.076% and 0.208%, respectively. Otherwise, this proposed model will drive the field of power consumption simulation development.
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