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| 1 | A NOVEL BOUNDARY INTEGRAL EQUATION METHOD FOR LINEAR ELASTICITY--NATURAL BOUNDARY INTEGRAL EQUATION显示文摘The boundary integral equation (BIE) of displacement derivatives is put at a disadvantage for the difficulty involved in the evaluation of the hypersingular integrals. In this paper, the operators δij and εij are used to act on the derivative BIE. The boundary displacements, tractions and displacement derivatives are transformed into a set of new boundary tensors as boundary variables. A new BIE formulation termed natural boundary integral equation (NBIE) is obtained. The NBIE is applied to solving two-dimensional elasticity problems. In the NBIE only the strongly singular integrals are contained. The Cauchy principal value integrals occurring in the NBIE are evaluated. A combination of the NBIE and displacement BIE can be used to directly calculate the boundary stresses. The numerical results of several examples demonstrate the accuracy of the NBIE. | Niu Zhongrong Wang Xiuxi Zhou Huanlin Zhang Chenli | 2001 | Acta Mechanica Solida Sinica2001，14，1： | 4 |
| 2 | Optimal design of nanofiltration system for surface water treatment显示文摘Both reverse osmosis(RO) and nanofiltration(NF) membranes have been increasingly used for water purification and desalination. However, the salt rejection of NF membranes is quite different from that of RO membranes,which makes a significant distinction in their process designs. This work started from the performance investigation of a single NF membrane element and then focused on the process design of the NF system for surface water treatment. In experimental tests, it was found that the observed rejection of the NF element becomes nearly constant when the concentrate flow is large enough, while the membrane flux of the NF element is quite stable regardless of the water flow across the membrane surface. These findings can be used to instruct the process design of the NF system for surface water treatment. In process design, a two-stage arrangement is sufficient for the NF system to reach the highest water recovery, while the RO system requires a three-stage arrangement. | Fei Bi Haiyang Zhao Zhijun Zhou Lin Zhang Huanlin Chen Congjie Gao | 2016 | Chinese Journal of Chemical Engineering2016，24，12： | 2 |
| 3 | Analytical integral algorithm in the BEM for orthotropic potential problems of thin bodies显示文摘 | Zhou Huanlin Niu Zhongrong Cheng Changzheng Guan Zhongwei | 2007 | Engineering Analysis with Boundary Elements2007，31，73： | 1 |
| 4 | Analytic formulations for calculating nearly singular integrals in two-dimensional BEM 显示文摘 | Niu Zhongrong Cheng Changzheng Zhou Huanlin | 2007 | Engineering Analysis with Boundary Elements2007，31，： | 1 |
| 5 | Comparison of CS,CGM and CS-CGM for Prediction of Pipe’s Inner Surface in FGMs显示文摘The cuckoo search algorithm(CS)is improved by using the conjugate gradient method(CGM),and the CS-CGM is proposed.The unknown inner boundary shapes are generated randomly and evolved by Lévy flights and elimination mechanism in the CS and CS-CGM.The CS,CGM and CS-CGM are examined for the prediction of a pipe’s inner surface.The direct problem is two-dimensional transient heat conduction in functionally graded materials(FGMs).Firstly,the radial integration boundary element method(RIBEM)is applied to solve the direct problem.Then the three methods are compared to identify the pipe’s inner surface with the information of measured temperatures.Finally,the influences of timepoints,measurement point number and random noise on the inverse results are investigated.It is found that the three algorithms are promising and can be used to identify the pipe’s inner surface.The CS-CGM has higher accuracy and faster convergence speed than the CS and CGM.The CS and CS-CGM are insensitive to the initial values.The CGM and CS-CGM are more insensitive to the measurement noises compared with the CS.With the increase of timepoints and measurement points,and with the decrease of measurement noises,the inverse results are more accurate. | Haolong Chen Bo Yu Huanlin Zhou Zeng Meng | 2017 | Computers, Materials & Continua2017，，4： | 1 |
| 6 | Analytic formulations for calculating nearly singular integrals in two-dimensional BEM显示文摘 | Zhongrong Niu Changzheng Cheng Huanlin Zhou Zongjun Hu | 2007 | Engineering Analysis with Boundary Elements2007，，12： | 1 |
| 7 | Analytical integral algorithm applied to boundary layer effect and thin body effect in BEM for anisotropic potential problems显示文摘 | Huanlin Zhou Zhongrong Niu Changzheng Cheng Zhongwei Guan | 2007 | Computers and Structures2007，，15： | 1 |
| 8 | Analytic formulations for calculating nearly singular integrals in two-dimensional BEM显示文摘 | Zhongrong Niu Changzheng Cheng Huanlin Zhou Zongjun Hu | 2007 | Engineering Analysis with Boundary Elements2007，，12： | 1 |
| 9 | Preparation of Anisotropic MnO2 Nanocatalysts for Selective Oxidation of Benzyl Alcohol and 5-Hydroxymethylfurfural显示文摘Anisotropic MnO2 nanostructures,includingα-phase nanowire,α-phase nanorod,δ-phase nanosheet,α+δ-phase nanowire,and amorphous fl occule,were synthesized by a simple hydrothermal method through adjusting the pH of the precursor solution and using diff erent counterions.The catalytic properties of the as-synthesized MnO2 nanomaterials in the selective oxidation of benzyl alcohol(BA)and 5-hydroxymethylfurfural(HMF)were evaluated.The eff ects of micromorphology,phase structure,and redox state on the catalytic activity of MnO2 nanomaterials were investigated.The results showed that the intrinsic catalytic oxidation activity was mainly infl uenced by the unique anisotropic structure and surface chemical property of MnO2.With one-dimensional and 2D structures exposing highly active surfaces,unique crystal forms,and high oxidation state of Mn,the intrinsic activities for MnO2 catalysts synthesized in pH 1,5,and 10 solutions(denoted as MnO2-pH1,MnO2-pH5,and MnO2-pH10,respectively)were twice higher than those of other MnO2 catalysts in oxidation of BA and HMF.With a moderate aspect ratio,theα+δnanowire of MnO2-pH10 exhibited the highest average oxidation state,most abundant active sites,and the best catalytic oxidation activity. | Huanlin Wang Yu Song Xuan Liu Shiyu Lu Chunmei Zhou Yuguang Jin Yanhui Yang | 2020 | Transactions of Tianjin University2020，26，5： | 1 |
| 10 | Shape and Size Optimization of Truss Structures under Frequency Constraints Based on Hybrid Sine Cosine Firefly Algorithm显示文摘Shape and size optimization with frequency constraints is a highly nonlinear problem withmixed design variables,non-convex search space,and multiple local optima.Therefore,a hybrid sine cosine firefly algorithm(HSCFA)is proposed to acquire more accurate solutions with less finite element analysis.The full attraction model of firefly algorithm(FA)is analyzed,and the factors that affect its computational efficiency and accuracy are revealed.A modified FA with simplified attraction model and adaptive parameter of sine cosine algorithm(SCA)is proposed to reduce the computational complexity and enhance the convergence rate.Then,the population is classified,and different populations are updated by modified FA and SCA respectively.Besides,the random search strategy based on Lévy flight is adopted to update the stagnant or infeasible solutions to enhance the population diversity.Elitist selection technique is applied to save the promising solutions and further improve the convergence rate.Moreover,the adaptive penalty function is employed to deal with the constraints.Finally,the performance of HSCFA is demonstrated through the numerical examples with nonstructural masses and frequency constraints.The results show that HSCFA is an efficient and competitive tool for shape and size optimization problems with frequency constraints. | Ran Tao Xiaomeng Yang Huanlin Zhou Zeng Meng | 2023 | Computer Modeling in Engineering & Sciences2023，，1： | 0 |
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