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- 저자 : Mengjie Fan (검색결과 3 건)
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Mengjie Du,Jun Liu,Wenbin Ye,Fan Yang,Gao Lin 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.81 No.2
The bending, buckling and free vibration responses of functionally graded material (FGM) beams are investigated semi-analytically by the scaled boundary finite element method (SBFEM) in this paper. In the concepts of the SBFEM, the dimension of computational domain can be reduced by one, therefore only the axial dimension of the beam is discretized using the higher order spectral element, which reduces the amount of calculation and greatly improves the calculation efficiency. The governing equation of FGM beams is derived in detail by the means of the principle of virtual work. Compared with the higherorder beam theory, fewer parameters and simpler control equations are used. And the governing equation is transformed into a first-order ordinary differential equation by introducing intermediate variables. Analytical solutions of the governing equation can be obtained by padé series expansion in the direction of thickness. Numerical example are compared with the numerical solutions provided by the previous researchers to verify the accuracy and applicability of the proposed method. The results show that the proposed formulations can quickly converge to the reference solutions by increasing the order of higher order spectral elements, and high accuracy can be achieved by using a small number of the elements. In addition, the influence of the structural sizes, material properties and boundary conditions on the mechanical behaviors of FG beams subjected to different load types is discussed.
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Wenying Shi,Tengfei Li,Mengjie Fan,Hongbin Li,Haixia Zhang,Xiaohong Qin 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-
The construction of rough and porous hydrophobic membrane surface is expected to overcome the obstaclesincluding low permeate water flux and membrane pore wetting which greatly restrict the developmentof membrane distillation (MD) technology. In this study, a rough and porouspolytetrafluoroethylene (PTFE) powder-embedded polyvinylidene fluoride (PVDF) hydrophobic coatinglayer was compounded on the outer surface of PVDF hollow fiber support membrane by the dilute solutioncoating-phase inversion method. PVDF hollow fiber support membrane was fabricated by the dry-jetwet-spinning technique. PTFE powder was directly incorporated in PVDF dilute coating solution andembedded in the porous PVDF coating layer after the nonsolvent induced phase separation (NIPS). Thevariations of membrane morphology, surface chemical compositions, hydrophobicity and wetting resistancewere investigated by scanning electron microscope (SEM), Attenuated total reflection-Fouriertransform infrared spectroscopy (ATR-FTIR), dynamic water contact angle (WCA) and liquid entry pressure(LEP) analysis. Membrane separation performance including desalination and ionic dyes removalproperties was evaluated by VMD experiment. Compared with PVDF hollow fiber support membrane,both the surface hydrophobicity and the water permeability of the PTFE powder-embedded PVDF hollowfiber composite membrane (HFC) had obvious improvement. The surface WCA and permeate water fluxincreased from 92.6 and 11.3 kg/m2.h for PVDF support membrane to 133.6 and 26.8 kg/m2.h for thePTFE powder-embedded HFC membrane meanwhile NaCl rejection can be maintained above 99.9%(3.5 wt% NaCl aqueous solution at 50 C and permeate pressure at 31.3 kPa). The separation performanceof HFC membrane can remain stable without obvious pore wetting during the continuous MD operationfor 36 h. Different from the desalination, porous hollow fiber membrane would adsorb two differentcharged dyes, Congo red (CR) and methylene blue (MB) to a certain extent, resulting in the decrease ofmembrane flux and the change of permeate water quality. Finally, the MD separation mechanism of inorganicsalt, anionic dye and cationic dye by PTFE powder-embedded HFC membrane was proposed.
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王淼丹(Miaodan Wang),商敏(Min Shang),范国锋(Guofeng Fan),王梦洁(Mengjie Wang),彭丽玲(Liling Peng),尚莫依(Moyi Shang) YIXIN 출판사 2023 教育教学研究论丛 Vol.1 No.2
随着高校“扩招”的推行,中国高校毕业生数量骤增,就业市场遭受冲击,高校毕业生就业问题日益凸显。以高考大省河南省为例,结合当今时代教育的发展以及社会对人才的需求,首先通过灰色关联度模型确定 12 个指标与就业竞争力的关联程度;其次采用 G1-熵权组合赋权法对各指标赋予权值大小,然后采用 WRSR 综合评价法对省内本科院校就业竞争力进行分档和评价分析。结果表明,同档次学校具备着类似的问题,可以相互交流,对其相关重要指标,结合学科特点可开展组团式发展和提升。 With the implementation of “enrollment expansion” in universities, the number of college graduates in China has increased sharply, the job market has been impacted, and the employment problem of college graduates has become increasingly prominent. We take Henan Province, a major province of the college entrance examination, as an example to study employment competitiveness of undergraduate colleges and universities, combined with the development of education in the current era and the social demand for talents. Firstly, the correlation degree between 12 indicators and employment competitiveness was determined by the grey correlation degree model; Secondly, the G1-entropy weight combination weighting method was used to assign weights to each index; and then the WRSR comprehensive evaluation method was used to classify and evaluate the employment competitiveness of undergraduate universities in the province. The results show that colleges and universities of the same grade have similar problems and can communicate with each other, and can carry out group development and promotion of the relevant important indicators combined with subject characteristics.
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