Preparation and Characterization of Biochar Based on Flameless Combustion System

Fengyun Lee(이풍운),Jaesam Shin(신재삼),Donghoon Shin(신동훈) 한국연소학회 2020 KOSCOSYMPOSIUM논문집 Vol.2020 No.9

This study designed experiments based on the pyrolysis principle of biochar and applied flameless combustion technology to the preaparation of biochar. Different kinds of biochar samples were prepared from four kinds of biomass materials: plastic, rubber, wood and food residue. The structure and physicochemical properties of biochar were analyzed by aseries of analytical and characterization techniques. The specific process of high-temperature pyrolysis and the role of biochar in the pyrolysis process were also studied.

Experimental Research on the Influence of Tool Material and Geometric Parameters on Cutting Surface Quality of Super Alloy

Fengyun Yu,He Wang,Yunliang Fu 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.5

For nickel base superalloy GH4169 is investigated in the process of machining tool is easy to wear,cold-setting severe deformation, surface quality is difficult to guarantee and so on, using different carbide cutting tools and different tool geometry parameters, nickel-based superalloy GH4169 be turning experiments. The cutting tool material, cutting tool rake angle and corner radius of the influence law of super alloy surface roughness, different tool wear condition analysis. Results show that using K313, KC5510, SM1105 three kinds of cutting tool materials processing, the difference of obtained surface roughness is not big, but for the tool wear condition, the rake face and rear face wear of KC5510 is small. Integrated tool wear and workpiece machined surface quality, in the selection of the four tool materials, KC5510 is more suitable for processing GH4169; Single factor experiments found that with the gradual increase in rake angle and the corner radius, the surface roughness gradually decreases. Therefore, when GH4169 be turning, in order to reduce the surface roughness, grain refinement should be used, together with the PVD TiAlN coating carbide cutting tools, while a larger rake angle and corner radius are selected.

Experimental Study of Factors Affecting the 7075 Aluminum Alloy Thin-walled Parts Milling Force

Fengyun Yu,Lin Wu,Yunliang Fu,Yanyan Guo,Can Zhao,Xufeng Wang 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.8

Taking 7075 aluminum alloy thin-walled part as the research object, with higher cutting parameters than the normal value selected, a four factors and four levels orthogonal experiment was carried out, in which we chose YG carbide cutting tools for the milling, intercepted the milling force stable section, selected ten peak values and took an average, conducted multiple linear regression analysis using Matlab numerical calculation software and established the milling force empirical formula of 7075 aluminum alloy thin-walled part to study the factors which have influence on its milling force. By range analysis of the experimental results, the cutting force change rule in the manufacturing process of aluminum alloy with the change of cutting parameter was revealed. It is found that the axial cutting depth had the greatest influence on the force perpendicular to the direction of cutting surface, and the radial cutting depth had the minimal impact. By comparative analysis on theoretical value and experimental value of milling forces, we found that the predicted value of the milling force Fx and Fy in theory were in good agreement with the experimental results with a relative error less than 8.7%. Under the experimental conditions, the optimal milling parameters are axial cutting depth of 2mm, radial cutting depth of 0.5mm, feed speed 95mm/min and cutting speed of 23.86m/min. It will provide data and experiment support for milling of thin-walled parts of similar materials, which will have important practical value and theoretical significance for engineering.

Research on Simulation and Experiment of Chip Shape for Machining High Temperature Alloy

Fengyun Yu,YuanTu,He Wang,Yunliang Fu 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.8

For superalloy GH4169poor processing, tool wear serious, affecting the surface quality of the workpiece and other issues, using the finite element software AdvantEdge to simulate the formation process of superalloy GH4169 chip in two-dimensional, and researching the characterization of serrated chip. Take the single factor experiment and conduct finite element simulation for superalloy GH4169 in changing the rake angle and tip arc radius of the situation. The simulation and the chip shape taking from experiments will be compared to prove the feasibility of the simulation. And find out changes of rake angle and tiparc radius; make clear the influence of degree of serrated chip. The results show: with the rake angle increases, serrated degree increases, and with tiparc radius increases, serrated degree increases. The study provides a reference for reasonable choice of optimized cutting tool geometric parameters.

Bran characteristics influencing quality attributes of whole wheat Chinese steamed bread

Ma, Fengyun,Lee, Yu Young,Baik, Byung-Kee Elsevier 2018 Journal of cereal science Vol.79 No.-

<P><B>Abstract</B></P> <P>This study investigated the variations in the characteristics of brans obtained from a pilot-scale milling of 17 soft red winter wheat varieties and their influences on the quality of whole wheat northern-style Chinese steamed bread (CSB) prepared from blends of a base flour, brans of different wheat varieties and vital gluten. Protein, starch, total dietary fiber (DF), water extractable arabinoxylan (WEAX) and total phenolic contents of brans ranged from 14.3 to 19.1%, 12.0–19.4%, 43.5–50.3%, 0.69–1.35% and 14.3–18.9 mg/g, respectively. Surface smoothness, crumb structure and stress relaxation scores of whole wheat CSB ranged from 3.0 to 9.5, 6.5–12.5 and 24.3–34.3, respectively. Bran bound and total phenolic contents exhibited negative relationships with CSB surface smoothness and crumb structure. Bran WEAX content showed positive relationships with CSB specific volume, surface smoothness and stress relaxation scores. Bran insoluble DF content was negatively related to CSB stress relaxation score. Bran protein and starch contents showed negative and positive relationships, respectively, with CSB spread ratio score. Cluster analysis of wheat brans based on CSB surface smoothness and crumb structure indicated that bran with a low protein content, low bound and total phenolic contents, and high starch and WEAX contents is desirable for making whole wheat CSB.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Bran of 17 wheat varieties showed substantial variations in bran characteristics. </LI> <LI> Bran water extractable arabinoxylans (WEAX) affected steamed bread (SB) volume. </LI> <LI> Bran phenolic content (PC) influenced SB surface smoothness and crumb structure. </LI> <LI> Bran insoluble dietary fiber affected stress relaxation score of whole wheat SB. </LI> <LI> Bran with a low PC, and a high WEAX content is desirable for making whole wheat SB. </LI> </UL> </P>

Effect of xylo-oligosaccharides on reproduction, lipid metabolism, and adipokines of hens during the late egg-laying period

Wen, Fengyun,Wang, Fengyan,Li, Pei,Shi, Hanyi,Liu, Ning Asian Australasian Association of Animal Productio 2022 Animal Bioscience Vol.35 No.11

Objective: The present study aimed to investigate the effect of xylo-oligosaccharides (XOS) administration on egg production, reproductive hormones, serum lipids and adipokines of hens at the late cycle of reproduction. Methods: Four treatments included control (basal diet) and XOS addition at 2.0 (XOS-2), 4.0 (XOS-4), or 6.0 (XOS-6) g/kg of diet using 288 commercial Hy-Line brown hens from 73 to 84 wk of age. Egg production, body fat deposition, reproductive tract and hormones, lipid metabolism and adipokines were determined. Results: At 84 wk, compared to the control, XOS supplementation at the three doses increased (p<0.001) egg-laying rates by 13.2% averagely, which led to a higher egg mass by 131 g/hen throughout the whole trial period. Abdominal fat and skinfold of XOS treatments were decreased (p<0.001) by 26.1% and 18.6%, respectively; large follicles and ovary weight were increased (p<0.001) by 0.73 follicle/hen and 18.6%, respectively. For serum parameters, cholesterol and triglyceride were decreased (p<0.001) by 17.5% and 29.2%, respectively; luteinizing hormone, follicle-stimulating hormone, and progesterone were increased (p≤0.001) by 16%, 31%, 29%, respectively; adiponectin and visfatin were increased (p<0.001) by 34% and 44%, respectively; but chemerin and leptin were decreased (p≤0.001) by 22% and 14%, respectively. With the increased XOS doses, linear decreases (p<0.05) were found on abdominal skinfold and serum triglyceride. Conclusion: The obtained data indicate that XOS can be used as an additive to improve fecundity by beneficially modulating fat deposition, lipid metabolism, reproductive hormones, and adipokines of hens at the late cycle of reproduction.

Research on Pattern Analysis and Data Classification Methodology for Data Mining and Knowledge Discovery

Heling Jiang,An Yang,Fengyun Yan,Hong Miao 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.3

A plethora of big data applications are emerging and being researched in the computer science community which require online classification and pattern recognition of huge data pools collected from sensor networks, image and video systems, online forum platforms, medical agencies etc. However, as an NP hard issue data mining techniques are facing with lots of difficulties. To deal with the hardship, we conduct research on the novel algorithm for data mining and knowledge discovery through network entropy. We firstly introduce necessary data analysis techniques such as support vector machine, neural network and decision tree methods. Later, we analyze the organizational structure of network graphical pattern with the knowledge of machine learning methodology and graph theory. Eventually, our modified method is finalized with decision and validation implementation. The simulation results of our approach on different databases show the feasibility and effectiveness of our proposed framework. As the final part, we provide our conclusion and prospect.

Experimental Study on Dynamic Water Grouting of Modified Water-Soluble Polyurethane

Xiaofan Liu,Junguang Wang,Kun Huang,Fengyun Li 대한토목학회 2019 KSCE Journal of Civil Engineering Vol.23 No.9

In underground project, water inrush disaster often occurs, resulting in a large number of casualties and economic losses. To solve these problems, grouting is one of the main techniques for controlling water inrush. At present, the research results on the treatment of water inrush by grouting are based on anhydrous or hydrostatic grouting. However, the study of dynamic water grouting is relatively few and the grouting materials are a little bit. In this paper, water-soluble polyurethane was selected as grouting material, modified by adding hydroxypropyl methyl cellulose, and the bond strength and microstructure change before and after modification are studied via bond strength experiment and microscopic observation. In addition, the WPU (water-soluble polyurethane) diffusion regularity of dynamic water grouting is studied by indoor flat grouting test. The research also adopts the Bingham fluid model according to the slurry characteristics to derive the grouting diffusion radius. The results show that the compactness of HPMC (hydroxypropyl methyl cellulose)-WPU is improved, the heterogeneity is reduced by 50.4%, and the bonding strength is increased by 153%. Therefore, the anti-scour ability of the HPMC-WPU is enhanced. The deviation of the WPU in the X-axis diffusion radius is 7.7 cm, and the HPMC-WPU is 4.39 cm. What’s more, the formula of grouting diffusion radius is derived. By comparing the formula with experiment results, the deviation is less than 15%, therefore, the formula has the significance of guiding engineering practice.

Computer Simulation of Metal Surface Micro-Crack Inspection Using Pulsed Laser Thermography

Tang Qingju,Bu Chiwu,Liu Yuanlin,Yu Fengyun,Zhao Yawei 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.3

Surface micro cracks are easy to produce in the preparation and service process of metal material, which impacts on the safe operation of metal components. Pulsed laser spot excitation and infrared thermal imaging technology are combined to detect metal surface micro-cracks. The working principle of laser infrared thermal imaging detection technology was described. The three dimensional heat conduction model of pulsed laser excitation flux transfer in metal plate was established, and calculated using finite element method (FEM). The results showed that, thermal flow in the image is a “D” shape. There are temperature differences between the sound regions and defective regions, and the defects experiences the process of obscure, gradually clear, and gradually obscure. Pulsed infrared thermography sequence was processed by polynomial fitting method, and the coefficient images effectively improve the contrast between defective and non-defective areas, which is beneficial to the determination and of recognition micro cracks.

Functional Study of Active Residues Scorpion Insect Toxin BmK IT from Buthus martensii Karsch

Yuejun Fu,Renjia Yang,Wujian Chen,Zhiyi Wu,Ai-Hua Liang,Fengyun Hu 한국생물공학회 2014 Biotechnology and Bioprocess Engineering Vol.19 No.2

Chinese scorpion Buthus martensii Karsch(BmK) venom is a rich source of neurotoxins which bindto various ion channels with high affinity and specificityand thus widely used as compounds to modulate channelgating. An excitatory insect toxin, BmK IT, is not conservedwith a glutamate residue at the preceding position of thethird Cys residue, and is a toxin with a non-glutamateresidue at the relevant position in the excitatory scorpion β-toxin subfamily. In this study, the mutants of recombinantBmK IT (BmK IT (I25E), BmK IT (E15G), BmK IT Cterminal(TKSYCDVQIN) truncated) were achieved bysite-directed mutagenesis. Biological activity of BmK ITand its mutants confirmed these residues or peptides playedkey roles in BmK IT. BmK IT (I25E) could increase thesensitivity of BmK IT, but BmK IT(E15G) could decreasethe sensitivity of BmK IT on Sf9 cells. BmK IT truncatedC-terminal hydrophobic amino acids could cross thespecies boundaries and was effective on mammalian C6cells. To date, several excitatory insect toxins have beenisolated and identified from the venom of Buthus martensiiKarsch. However, no functional data are available andtherefore its classification in the family of excitatory insecttoxins remains putative and is just based on its highsimilarity with the other toxins of this family. These resultsverified I25, E15 and C-terminal (TKSYCDVQIN) inBmK IT played key roles in the interaction of the BmK ITand its receptor- sodium channels on the surface of insectcells and laid a foundation for further structural andfunctional analysis of BmK IT.