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Loading-unloading judgement for advanced plastic UH model

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Acta Mechanica Sinica 2020年第4期36卷 827-839页

作者： X.Feng Y.P.Yao R.N.Li z.wan X.Dai College of Airport Civil Aviation University of ChinaTianjin 300300China School of Transportation Science and Engineering Beihang UniversityBeijing 100191China School of Automobile and Transportation Tianjin University of Technology and EducationTianjin 300222China Research Institute of Base and Foundation China Academy of Building ResearchBeijing 100013China

The unified hardening(UH)model proposed by Yao et al.(Geotechnique 2009)is the constitutive model which can consider the influence of the complex stress path and stress history on the deformation and strength of clays ***,the loading-unloading criterion of material model is defined as the change law of the intersection of current yield surface and the p axis,which makes the loading-unloading in the process of hardening and softening can be unified considered in UH ***,the Newton-Raphson method is adopted to attain the nonlinear problems solution in the finite element method of UH model,and the semi-implicit return mapping method is adopted to update *** application of the UH model in the finite element is *** then,the analyses of triaxial test are performed using the unit prediction and finite element *** results of the unit prediction method are compared with the experimental results to illustrate the rationality of the UH *** the results with the unit prediction method and the finite element method,the correctness of the finite element program of the UH model is ***,Ae three-dimensional firdte element andysis of embankment on soft soil is performed by the *** comparison between the results calculated by the UH model and the modified Cam-clay(MCC)model and the experimental data shows that the UH model is rational in analyzing the actual embankment engineering on soft soil.

关键词： Over-consolidated clay Unified hardening model Loading-unloading judgement Finite element method Stress-strain

临床T1aN0M0肺癌：基于高分辨力CT的临床病理模式和肿瘤学结果的差异

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国际医学放射学杂志 2021年第6期 744-744页

作者： K.Sun A.You B.wang N.Song z.wan F.Wu 郭虹

目的根据最新第8版TNM分类,阐明临床TNM(c-TNM)肺癌的临床病理特征和肿瘤学结果。方法回顾性纳入257例c-T1aN0M0肺癌病人。根据高分辨力CT

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New types of singular solutions of conformal Q-curvature equations

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Acta Mathematica Sinica,English Series 2025年

作者： zongming Guo zhongyuan Liu Fangshu wan Department of Mathematics Henan Normal University School of Mathematics and Statistics Henan University School of Mathematical Sciences Anhui University

We construct radial and non-radial singular solutions u ∈ C4（B{0}） with a non-removable singular point x = 0 for the conformal Q-curvature equation:■where B = {x ∈ R4: |x| D0≥ 0, and satisfying ■Moreover, detailed asymptotic expansions near x = 0 of these radial and non-radial singular solutions can be established. As an application, we can also obtain the existence of two types of solutions u ∈ C4（R4■） to the problem ■ satisfying |x|-2u（x） →-D D0, and satisfying u（x） = o（|x|2） uniformly as |x| → ∞.

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ON THE L_∞ CONVERGENCE AND THE EXTRAPOLATION METHOD OF A DIFFERENCE SCHEME FOR NONLOCAL PARABOLIC EQUATION WITH NATURAL BOUNDARY CONDITIONS

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Journal of Computational Mathematics 2001年第5期19卷 449-458页

作者： wan, z.-S. Sun, z.-z. Institute of Applied Physics and CM P.O. Box 8009 Beijing 100088 China

In paper (J. Comput. Appl. Math., 76 (1996), 137-146), a difference scheme for a class of nonlocal parabolic equations with natural boundary conditions was derived by the method of reduction of order and the unique solvability and second order convergence in L2-norm are proved. In this paper, we prove that the scheme is second order convergent in L∞ norm and then obtain fourth order accuracy approximation in L∞ norm by extrapolation method. At last, one numerical example is presented.

关键词： Approximation theory Boundary conditions Convergence of numerical methods Extrapolation

A method for analyzing on-line video images of crystallization at high-solid concentrations

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Particuology 2008年第1期6卷 9-15页

作者： Jian wan Cai Y. Ma Xue z. wang Institute of Particle Science and Engineering School of Process Environmental and Materials Engineering University of Leeds Leeds LS2 9JT UK

Recent research has demonstrated that on-line video imaging is a very promising technique for monitoring crystallization processes. The bottleneck in applying the technique for real-time closed-loop control is considered as image analysis that needs to be robust, fast and able to handle varied image qualities due to temporal variations of operating conditions such as mixing and solid concentrations. Image analysis at highsolid concentrations turns out to be extremely challenging because crystals tend to overlap or attach to each other and the boundaries between the crystals are usually ambiguous. This paper presents an image segmentation algorithm that can effectively deal with images taken at high-solid concentrations. The method segments crystals attached to each other along the mostly related concave points on the contours of crystal blocks. The detailed procedure is introduced with application to crystallization of L-glutamic acid in a hot-stage reactor.

关键词： Crystallization High-solid concentrations Image processing Multi-scale segmentation Watershed segmentation Crystal size distribution

Evaluation of the infectivity,gene and antigenicity persistence of rotaviruses by free chlorine disinfection

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Journal of Environmental Sciences 2011年第10期23卷 1691-1698页

作者： Dan Li April z. Gu Siyu zeng wan Yang Miao He Hanchang Shi Environmental Simulation and Pollution Control （ESPC） State Key Joint Laboratory School of Environment Tsinghua University Beijing 100084 China Department of Civil and Environmental Engineering Northeastern University Boston MA 02115 USA

The effects of free chlorine disinfection of tap water and wastewater effluents on the infectivity, gene integrity and surface antigens of rotaviruses were evaluated by a bench-scale chlorine disinfection experiments. Plaque assays, integrated cell culture-quantitative RT- PCR （ICC-RT-qPCR）, RT-qPCR, and enzyme-linked immunosorbent assays （ELISA）, respectively, were used to assess the influence of the disinfectant on virus infectivity as well as genetic and antigenic integrity of simian rotavirus SA11 as a surrogate for human rotaviruses. The ICC-RT-qPCR was able to detect rotaviruses survival from chlorine disinfection at chlorine dose up to 20 mg/L （60 min contact）, which suggested a required chlorine dose of 5 folds （from 1 to 5 mg/L） higher than that indicated by the plaque assay to achieve 1.8 log10 reductions in tap water with 60 rain exposing. The VP7 gene was more resistant than the infectivity and existed at chlorine dose up to 20 mg/L （60 min contact）, while the antigencity was undetectable with chlorine dose more than 5 mg/L （60 min contact）. The water quality also impacted the inactivation efficiencies, and rotaviruses have a relatively higher resistant in secondary effluents than in the tap water under the same chlorine disinfection treatments. This study indicated that rotaviruses have a higher infectivity, gene and antigencity resistance to chlorine than that previously indicated by plaque assay only, which seemed to underestimate the resistance of rotaviruses to chlorine and the risk of rotaviruses in environments. Present results also suggested that re-evaluation of resistance of other waterborne viruses after disinfections by more sensitive infectivity detection method （such as ICC-RT-qPCR） may be necessary, to determine the adequate disinfectant doses required for the inactivation of waterborne viruses.

关键词： rotaviruses free chlorine disinfection infectivity genes antigenicity ICC-RT-qPCR

Oscillating-grid turbulence at large strokes: Revisiting the equation of Hopfinger and Toly

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Journal of Hydrodynamics 2016年第3期28卷 473-481页

作者： wan hanna melini wan mohtar Department of Civil and Structural Engineering Faculty Engineering and Built Environment Universiti Kebangsaan Malaysia Bandar BaruBangi 43600 Selangor Malaysia

A quasi-isotropic, quasi-homogeneous turbulence generated by an oscillating-grid, spatially decays according to power law of u ∝ z-nM , where u is the root mean square （rms） horizontal velocity, z is the vertical distance from the grid and nu = 1. However, the findings of Nokes and Yi indicate that as the stroke of oscillation increases, the power law n u= 1 and does not follow the established decay law equation of Hopfinger. This paper investigates the characteristics of the turbulence that are generated using larger strokes S/M = 1.6 and 2 and compares with that obtained using a S/M = 0.8, which is the stroke used when the equation was developed. Measurements of the grid-generated turbulence in a water tank were taken using particle image velocimetry （PIV）. The results showed that the homogeneity occurred at distance beyond 2.5 mesh spacings away from the grid midplane, independent of the stroke and the frequency of oscillation. Within this region, the turbulent kinetic energy distribution was quasi-homogeneous, and the secondary mean flow is negligible. The statistical characteristics of the measured turbulence confirmed that although nu decreases as stroke increases, the grid-turbulence generated at S/M = 1.6 and 2 obeys the universal decay law.

关键词： oscillating-grid turbulence large strokes decay power law

Roles of fermented plant-,dairy-and meat-based foods in the modulation of allergic responses

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Food Science and Human Wellness 2023年第3期12卷 691-701页

作者： Muhamad Hafi z Abd Rahim Nur Hazlin Hazrin-Chong Hanis Hazeera Harith wan Abd Al Qadr Imad wan-Mohtar Rashidah Sukor Faculty of Food Science and Technology Universiti Putra Malaysia43400 SerdangSelangorMalaysia Department of Biological Sciences and Biotechnology Faculty of Science and TechnologyUniversiti Kebangsaan Malaysia43600 BangiSelangorMalaysia Faculty of Medicine and Health Sciences Universiti Putra Malaysia43400 SerdangSelangorMalaysia Functional Omics and Bioprocess Development Laboratory Institute of Biological SciencesFaculty of ScienceUniversiti Malaya50603 Kuala LumpurMalaysia Laboratory of Food Safety and Food Integrity Institute of Tropical Agriculture and Food SecurityUniversiti Putra Malaysia43400 SerdangSelangorMalaysia

This review attempts to delineate the effects and roles of fermented foods on allergic responses(AR),specifically from milk,plant,and meat *** for AR alleviation and aggravation were noted for many different fermented food *** outcomes on AR through fermented foods could be linked to microbial hydrolysis of food allergens,improvement in gut microbiota robustness,and modulation of the immune system that promotes a balance between T helper 1(Th1)and Th2 *** on plant-based,non-protein rich fermented foods tend to show more favourable results compared to those on meat-based or protein-rich *** usage of specific and known starter cultures are helpful in alleviating AR,as in the case for many yogurt,Kefir or Dahi *** fermentation time was also deemed important,exemplified in studies that showed inefficient AR reduction through consumption of fresh ***,formation of new allergens through fermentation of certain meat-based foods,or by using specific fermenting microbes(*** sp.),is ***,combination of starter cultures and food substrates must be considered in preventing or eliminating AR from intake of these *** review may aid consumers to make informed decision during the consumption of fermented food.

关键词： Allergy Fermented food Milk-based allergens Plant-based allergens Animal-based allergens

Synthesis,Structure and Hydrogenation Property of trans-PdCl_(2){Ph_(2)P[o-C_(6)H_(4)CH(OC_(2)H_(5))_(2)]}_(2)

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Chemical Research in Chinese Universities 1997年第4期13卷 117-120页

作者： Xu, PP Gao, JX zhou, zH wang, Jz Chen, z Hu, Sz.wan, HL XIAMEN UNIV DEPT CHEMSTATE KEY LAB PHYS CHEM SOLID SURFACEXIAMEN 361005PEOPLES R CHINA XIAMEN UNIV INST PHYS CHEMXIAMEN 361005PEOPLES R CHINA

Ｓｙｎｔｈｅｓｉｓ，ＳｔｒｕｃｔｕｒｅａｎｄＨｙｄｒｏｇｅｎａｔｉｏｎＰｒｏｐｅｒｔｙｏｆｔｒａｎｓ┐ＰｄＣｌ２｛Ｐｈ２Ｐ［ｏ┐Ｃ６Ｈ４ＣＨ（ＯＣ２Ｈ５）２］｝２＊ＸＵＰｉａｎ－ｐｉａｎ，ＧＡＯＪｉｎｇ－ｘｉｎｇ＊＊... 详细信息

Ｓｙｎｔｈｅｓｉｓ，ＳｔｒｕｃｔｕｒｅａｎｄＨｙｄｒｏｇｅｎａｔｉｏｎＰｒｏｐｅｒｔｙｏｆｔｒａｎｓ┐ＰｄＣｌ２｛Ｐｈ２Ｐ［ｏ┐Ｃ６Ｈ４ＣＨ（ＯＣ２Ｈ５）２］｝２＊ＸＵＰｉａｎ－ｐｉａｎ，ＧＡＯＪｉｎｇ－ｘｉｎｇ＊＊，ＺＨＯＵＺｈａｏ－ｈｕｉ，ＷＡＮ...

关键词： Palladium complex Hydrogenation Crystal structure