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Chengyu Yang,Xiaojuan Yang,Feng Li,Taohai Li,Wei Cao 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.39 No.-
Functional Sb2WO6 samples were prepared by a solvothermal method. XRD and XPS spectroscopy wereused to demonstrate structures of the as-prepared Sb2WO6 samples. And the morphologies werecharacterized via SEM and TEM. Different morphologies of the Sb2WO6 samples can be convenientlyachieved by simply changing the pH value. The Sb2WO6microspheres were obtained when the pH = 2. Apossible formation process of Sb2WO6 microspheres was proposed. The Sb2WO6 microspheres have highphotocatalytic activity and stability for the degradation of Rhodamine B. Moreover, the wettability ofSb2WO6 microspheres was also investigated. Results suggest that Sb2WO6 surface has highsuperhydrophobicity.
Longfeng Li,Chengyu Li,Mingzhu Liu,Cheng Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.11
The catalytic performance of ceria oxide (CeO2) was greatly influenced by the materials' structure and surface area. In this paper, CeO2 porous nanospheres (PNS) with tunable pore and sphere sizes were synthesized by a solvothermal method using diethylene glycol as reaction media. All the as-synthesized CeO2 PNS presented good adsorption capacity for methyl orange, which makes them potential application in waste water treatment conveniently and economically. The control over the sphere and pore sizes of CeO2 PNS was achieved by regulating the volume of water bubble in the reaction system, which supplied limited room for the assembling of preformed CeO2 small nano-precursors.
Effect of a Multi-stage Processing Method on the Composite Properties of a Stainless-Steel Surface
Jing Li,Jianan Cao,Lida Pan,Feng Du,Weibing Wang,Chengyu Xu 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.4
In this study, a multi-stage sandblasting and acid-etching processing method is used to prepare a 304 stainless-steel surfacewith a loose structure that has the composite properties of superhydrophobicity, low adhesion, anti-icing ability, self-cleaningbehavior and corrosion resistance. The surface morphology and chemical constituents of this structure are characterizedby scanning electron microscopy and X-ray diffraction, respectively. The results show that the micro-scale roughness anddifferent degrees of porosity in this structure play a key role in its superhydrophobicity.The anti-icing properties and corrosionresistance are characterized by contact-angle measurements and electrochemical workstation analyses, respectively. The results show that superhydrophobicity has positive effects on surface self-cleaning, anti-icing properties and corrosionresistance of 304 stainless-steel.
A modal approach for the efficient analysis of a bionic multi-layer sound absorption structure
Yonghua Wang,Chengyu Xu,Yanling Wan,Jing Li,Huadong Yu,Luquan Ren 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.21 No.2
The interest of this article lies in the proposition of using bionic method to develop a new sound absorber and analyze the efficient of this absorber in a ski cabin. Inspired by the coupling absorption structure of the skin and feather of a typical silent flying bird — owl, a bionic coupling multi-layer structure model is developed, which is composed of a micro-silt plate, porous fibrous material and a flexible micro-perforated membrane backed with airspace. The finite element simulation method with ACTRAN is applied to calculate the acoustic performance of the multi-layer absorber, the vibration modal of the ski cabin and the sound pressure level (SPL) near the skier's ears before and after pasting the absorber at the flour carpet and seats in the cabin. As expected, the SPL near the ears was significantly reduced after adding sound-absorbing material. Among them, the model 2 and model 5 showed the best sound absorption efficiency and the SPL almost reduced 5 dB. Moreover, it was most effctive for the SPL reduction with full admittance configuration at both the carpet and the seats, and the carpet contribution seems to be predominant.
Zhaoqin Wang,Xiaorong Wang,Xiaoqin Liu,Yusen Wang,Chengyu Li,Tiesong Lin,Peng He 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.9
Common 3-axis CNC milling machines are generally equipped with 2D tool radius compensation (2D-TRC), which can realize TRC function for the contours in three basic planes when flat end mills are used. The 2D-TRC function makes engineers to program according to the actual contour of a part, and avoids over-cut phenomenon. Unfortunately, the 2D-TRC is unsuitable for ball end mills (BEMs), especially in the situation of milling complex curves or surfaces. In this work, a new TRC named BEM-TRC is used for milling NURBS curve swept surfaces using BEMs based on 3-axis CNC milling machines. In BEM-TRC, the TRC of a BEM involves radial and axial compensation. The cutting point (CP), which is the tangent point between a BEM and a NURBS curve, is considered as a calculation basis point. After obtaining a CP on a NURBS curve using the equi-arc length bisection interpolation method, the cutter center point of a BEM is calculated through off setting the CP the radius ( r ) distance of the BEM along its normal vector. Then the cutter location point of the BEM can be obtained according to the cutter center point. The CNC finishing program corresponding to the cutter location point can be obtained using Matlab software. The simulation based on VERICUT and machining based on a 3-axis milling machine verifies the effectiveness of the BEM-TRC. The over-cut phenomenon is avoided successfully when the BEM-TRC is used.
Central role of autophagic UVRAG in melanogenesis and the suntan response
Yang, Yongfei,Jang, Gyu-beom,Yang, Xuanjun,Wang, Qiaoxiu,He, Shanshan,Li, Shun,Quach, Christine,Zhao, Shihui,Li, Fan,Yuan, Zengqiang,Lee, Hye-Ra,Zhong, Hanbing,Liang, Chengyu National Academy of Sciences 2018 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.115 No.33
<P>UV-induced cell pigmentation represents an important mechanism against skin cancers. Sun-exposed skin secretes alpha-MSH, which induces the lineage-specific transcriptional factor MITF and activates melanogenesis in melanocytes. Here, we show that the autophagic tumor suppressor UVRAG plays an integral role in melanogenesis by interaction with the biogenesis of lysosome-related organelles complex 1 (BLOC-1). This interaction is required for BLOC-1 stability and for BLOC-1-mediated cargo sorting and delivery to melanosomes. Absence of UVRAG dispersed BLOC-1 distribution and activity, resulting in impaired melanogenesis in vitro and defective melanocyte development in zebrafish in vivo. Furthermore, our results establish UVRAG as an important effector for melanocytes' response to alpha-MSH signaling as a direct target of MITF and reveal the molecular basis underlying the association between oncogenic BRAF and compromised UV protection in melanoma.</P>
Wubin Shan,Zulu Deng,Hao Zhong,Hu Mo,Ziqiang Han,Zhi Yang,Chengyu Xiang,Shuzhou Li,Peng Liu 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.76 No.4
On the basis of nonlocal strain gradient theory, considering the material properties of porous FGM changing with thickness and the influence of moment of inertia, the wave equation of FG nano circular plate is derived by using the first-order shear deformation plate theory, by introducing dimensionless parameters, we transform the equations into dimensionless wave equations, and the dispersion relations of bending wave, shear wave and longitudinal wave are obtained by Laplace and Hankel integral transformation method. The influence of nonlocal parameter, porosity volume fraction, strain gradient parameters and power law index on the propagation characteristics of bending wave, shear wave and longitudinal wave in FG nano circular plate.
Cheng Yu,Lin Wang,Chuanjun Han,Jiaqiang Jing,Yuxing Li,Wuchang Wang,Mingjun Du,Xincan Song,Longyao Zhang 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.7
The hydrate particle aggregation is crucial for the flow safety of oil and gas pipelines. In this paper, coupled with the Eulerian-Eulerian model, k-ε turbulence model and the population balance model considering the hydrate aggregation and breakage, the hydrate aggregation process is studied in the bend, and the change of the average particle size under different hydrate volume fractions is discussed. The results show that the hydrate aggregation process includes two stages in the bend, namely the rapid growth and the dynamic equilibrium. In the rapid growth stage, both the hydrate concentration and particle size in the elbow increase rapidly, and the high concentration and large particle size regions on the inside of the elbow also increase significantly. Furthermore, two types of aggregates are formed on the inside of the elbow. One is a small amount of large-particle aggregates, while the other is the relatively high concentration of medium-size aggregates. Besides, the uniform suspension with a smaller concentration and particle size is distributed on the outside of the elbow, but there are also large-size particles that aggregate and adhere near the wall of pipe. As the hydrate volume fraction increases, the hydrate average particle size increases. High concentration hydrate reaches dynamic equilibrium faster during the flow process.