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Multi-Quality Properties Capability Analysis for Prestressing Strand of Prestressed Concrete

厦门大学学报（自然科学版） 2002年第S1期41卷 111-页

作者： wen pei sung Kuen Suan Chen Cheer Germ Go Department of Landscape Design and Management Department of Industrial Engineering and Management National ChinyiInstitu te of TechnologyDepartment of Civil Engineering National Chung Hsing University Taiping Taichung Taiwan 41111 ChinaTaichungTaiwan 40227 China

Prestressed concrete structures are main conformati on for the construction of high way bridges. The quality of prestressed concrete s tructures is mainly affected by the tensile strength of prestressing strand. In order to attain the purpose of economic design and long life span of prestressin g strand, the less relaxation property of strand type is suitable for constructi on and usage. Thus, the research and development of prestressing strand is requi red to reach the goals of high tensile strength and low relaxation. To ensure th e required quality of prestressing strand, the strand pull test and long period relaxation test are two important items for the quality assurance. There are thr ee specific items of the tensile strength test are belong to larger-the-better quality type. The quality type of smaller-the-better is for the long period r elaxation test. However, many existing methods are able to measure process capab ility for product with single quality characteristic and cannot be applied to mo st products with multiple properties. Thus, the indices of C pu and C pl, for larger-the-better and smaller-the-better quality type respec tively proposed by Kane, are quoted and combined to propose a new index to evalu ate the quality of multiple characteristics of prestressing strand in this paper . Then, the principle of statistics is used to derive the one-to-one mathemati cal relationship of this new index and ratio of tallied. Finally, the procedure and criteria to evaluate the quality of prestressing strand is proposed. This in tegrated multi-quality property capability analysis model can be used to evalua te the multi-process capabilities and provide continuous improvement on manufac turing process of prestressing strand.

关键词： index of multi-quality properties entire produc t prestressing strand

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Finite element modeling for analysis of cracked cylindrical pipes

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第9期8卷 1373-1379页

作者： sung wen-pei GO Cheer-germ SHIH Ming-hsiang Department of Landscape Design and Management National Chin-Yi University of TechnologyTaipingTaichung 41111TaiwanChina Department of Civil Engineering National Chung Hsing UniversityTaichung 40227TaiwanChina Department of Construction Engineering National Kaohsiung First University of Science and TechnologyKaohsiung 811TaiwanChina

The characteristic properties of shell element with similar shapes are used to generate a so-called super element for the analysis of the crack problems for cylindrical pressure vessels. The formulation is processed by matrix condensation without the involvement of special treatment. This method can deal with various singularity problems and it also presents excellent results to crack problems for cylindrical shell. Especially,the knowledge of the kind of singular order is not necessary in super element generation; it is very economical in terms of computer memory and programming. This method also exhibits versatility to solve the problem of kinked crack at cylindrical shell.

关键词： Crack shell Super-element Pressure vessel

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Reliable evaluation method of quality control for compressive strength of concrete

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2005年第8期6卷 836-843页

作者： CHEN Kuen-suan sung wen-pei SHIH Ming-hsiang Department of lndustrial Engineering and Management National Chin-Yi Institute of Technologv Taiping Taichung Taiwan 41111 China Department of Landscape Design and Management National Chin-Yi Institute of Technologv Taiping Taichung Taiwan 41111 China Department of Construction Engineering National Kaoshiang First University of Science and Technology Kaoshiang Taiwan 824 China

Concrete in reinforced concrete structure (RC) is generally under significant compressive stress load. To guarantee required quality and ductility, various tests have to be conducted to measure the concrete’s compressive strength based on ACI (American Concrete Institute) code. Investigations of recent devastating collapses of structures around the world showed that some of the collapses directly resulted from the poor quality of the concrete. The lesson learned from these tragedies is that guaranteeing high quality of concrete is one of the most important factors ensuring the safety of the reinforced concrete structure. In order to ensure high quality of concrete, a new method for analyzing and evaluating the concrete production process is called for. In this paper, the indices of fit and stable degree are proposed as basis to evaluate the fitness and stability of concrete’s compressive strength. These two indices are combined to define and evaluate the quality index of the compressive strength of concrete. Prin-ciples of statistics are used to derive the best estimators of these indices. Based on the outcome of the study, a concrete compres-sive strength quality control chart is proposed as a tool to help the evaluation process. Finally, a new evaluation procedure to assess the quality control capability of the individual concrete manufacturer is also proposed.

关键词： Quality index of concrete The best estimators Quality control chart Evaluation criteria Fit degree of compressive strength of concrete Stable degree of compressive degree of concrete

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Mechanism of action of Linggui Zhugan Decoction in treating non-alcoholic fatty liver disease using untargeted metabolomics approach

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Traditional Medicine Research 2025年第2期10卷 65-76页

作者： Huan pei Ren-Lin Li Xin-Ran Song Qian-Qian Wan Yu-Ming Wang Han-Zhou Li Wei-Quan Xu Jia-Bao Liao Wei-Bo wen Jing Miao Huan-Tian Cui School of Basic Medicine Yunnan University of Chinese MedicineKunming 650599China School Clinical Medical College Yunnan University of Chinese MedicineKunming 650599China First School of Clinical Medicine Yunnan University of Chinese MedicineKunming 650599China School of Integrative Chinese and Western Medicine Tianjin University of Traditional Chinese MedicineTianjin 301617China Department of Pharmacy Tianjin Second People's HospitalTianjin 300192China

Background:Non-alcoholic fatty liver disease(NAFLD)is a liver disorder characterized by the accumulation and degeneration of fat in the liver cells,a condition that may further deteriorate and lead to cirrhosis and liver *** studies showed that metabolic dysfunction can promote NAFLD *** Zhugan Decoction(LGZGD)has therapeutic effects on *** mechanism of LGZGD still remains *** study was to examine the impact of LGZGD on the metabolic processes involved in the development of ***:A mice model of NAFLD was treated with *** therapeutic potential of LGZGD was evaluated by assessing the activity of transaminases,lipids levels of blood,and pathological changes in the liver of the mice model of ***,this study also evaluated the influence of LGZGD on liver inflammation and oxidative ***:The results of untargeted metabolomics analysis showed that LGZGD reduced the disordered lipid metabolism in NAFLD *** improved the oxidative stress and also reduced the levels of pro-inflammatory cytokines in the *** metabolomics analysis of liver samples revealed that LGZGD treatment improved metabolic disorders,including alanine,aspartate,glutamate,glycerophospholipid metabolism,and citrate *** RT-qPCR and Western blot results showed that LGZGD could regulate the expression of key enzymes in the metabolic pathway of the citrate cycle,including ATP-citrate lyase(ACLY),alanine-glyoxylate aminotransferase-2(AGXT2),phosphatidylethanolamine N-methyltransferase(PEMT),and succinate dehydrogenase(SDH).Conclusion:We found that LGZGD can treat NAFLD by reducing inflammatory responses,inhibiting oxidative stress,regulating alanine,aspartate,glutamate,and glycerophospholipid metabolism,and citrate cycle pathways.

关键词： NAFLD LGZGD untargeted metabolomics glycerophospholipid metabolism citrate cycle

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Photothermal regulated ion transport in nanofluidics:From fundamental principles to practical applications

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Nano Research 2023年第7期16卷 10061-10071页

作者： pei Liu Lei Jiang Liping wen Henan Institute of Advanced Technology Zhengzhou UniversityZhengzhou 450052China Key Laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China

Light regulated ion transport across membranes is central to *** on this,artificial nanofluidics with light driven ion transport behaviors has been developed for both fundamental study and practical ***,we focus on recent progress in photothermal controlled ion transport systems and review the corresponding construction strategies in diverse photothermal nanofluidics with various dimensions and *** systematically emphasize the three underlying working principles including temperature gradient,water evaporation induced ion transport blockage,and evaporation *** the basis of these fundamental research,photothermal regulated ion transport has been mainly introduced into ionic devices,desalination,and energy ***,we provide some perspectives for the current challenges and future developments of this promising research *** believe that this review could encourage further understanding and open the minds to develop new advances in this fertile research field.

关键词： nanofluidics ion transport photothermal conversion ion pump energy conversion

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Comparative analysis of CFD models for jetting fluidized beds:Effect of particle-phase viscosity

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Particuology 2012年第4期10卷 444-449页

作者： pei pei Kai Zhang Gang Xu Yongping Yang Dongsheng wen Beijing Shenwu Environment&Energy Technology Corporation Beijing 102200China State Key Laboratory of Alternate Electrical PowerSystem with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China School of Engineering and Materials Science queen Mary University of LondonLondon E14NSUK

Under the Eulerian-Eulerian framework of simulating gas-solid two-phase flow, the accuracy of the hydrodynamic prediction is strongly affected by the selection of rheology of the particulate phase, for which a detailed assessment is still absent. Using a jetting fluidized bed as an example, this work investi- gates the influence of solid rheology on the hydrodynamic behavior by employing different particle-phase viscosity models. Both constant particle-phase viscosity model （CVM） with different viscosity values and a simple two-fluid model without particle-phase viscosity （NVM） are incorporated into the classical two- fluid model and compared with the experimental measurements. Qualitative and quantitative results show that the jet penetration depth, jet frequency and averaged bed pressure drop are not a strong func- tion of the particle-phase viscosity. Compared to CVM, the NVM exhibits better predictions on the jet behaviors, which is more suitable for investigating the hydrodynamics of gas-solid fluidized bed with a central jet.

关键词： Jetting fluidized bedHydrodynamicsCFDEulerian-Eulerian modelParticle phase viscosity

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Precise integration method for a class of singular two-point boundary value problems

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Acta Mechanica Sinica 2013年第2期29卷 233-240页

作者： wen-Zhi Zhang pei-Yan Huang School of Civil and Transportation Engineering South China University of Technology

In this paper we present a precise integration method based on high order multiple perturbation method and reduction method for solving a class of singular twopoint boundary value ***,by employing the method of variable coefficient dimensional expanding,the non-homogeneous ordinary differential equations（ODEs） are transformed into homogeneous *** the interval is divided evenly,and the transfer matrix in every subinterval is worked out using the high order multiple perturbation method,and a set of algebraic equations is given in the form of matrix by the precise integration relation for each segment,which is worked out by the reduction *** numerical examples are elaboratedd to validate the present method.

关键词： Singular two point boundary value problem Precise integration method High order multiple perturbation method Reduction method

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CFD simulation of a gas-solid fluidized bed with two vertical jets

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Particuology 2010年第5期8卷 425-432页

作者： pei pei Kai Zhang Jintian Ren Dongsheng wen Guiying Wu State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing 102249 China School of Engineering and Materials Science Queen Mary University of London Mile End Road London E1 4NS UK National Engineering Laboratory for Biomass Power Generation Equipment North China Electric Power University Beijing 102206 China

A computational fluid dynamics （CFD） model is used to investigate the hydrodynamics of a gas-solid fluidized bed with two vertical jets. Sand particles with a density of 2660 kg/m3 and a diameter of 5.0 × 10^-4 m are employed as the solid phase. Numerical computation is carried out in a 0.57 m ×1.00 m two-dimensional bed using a commercial CFD code, CFX 4.4, together with user-defined Fortran subroutines. The applicability of the CFD model is validated by predicting the bed pressure drop in a bubbling fluidized bed, and the jet detachment time and equivalent bubble diameter in a fluidized bed with a single jet. Subsequently, the model is used to explore the hydrodynamics of two vertical jets in a fluidized bed. The computational results reveal three flow patterns, isolated, merged and transitional jets, depending on the nozzle separation distance and jet gas velocity and influencing significantly the solid circulation pattern. The jet penetration depth is found to increase with increasing jet gas velocity, and can be predicted reasonably well by the correlations of Hong et al. （2003） for isolated jets and of Yang and Keairns （1979） for interacting jets.

关键词： Gas-solid fluidized bedTwo vertical jetsFluid dynamicsCFD model

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Preparation of Platinum(II) Complexes with 1-β-D-Ribofuranosyl-1,2,4-triazole-3-carboxamide and its Deoxy-analogue

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Chinese Chemical Letters 2001年第6期12卷 559-562页

作者： wen pei Kobe JOZE College of Chemical Engineering Zhejiang University of TechnologyHangzhou 310014 National Institute of Chemistry Hajdrihova 19SI-1115 LjubljanaSlovenia

The platinum (II) complexes of the [Pt (N4,N7-Ribavirin) (DMSO) Cl], [Pt (N4,N7-De-oxyribavirin) (DMSO) Cl] were obtained by the reactions of cis-[Pt (DMSO)2 Cl2] and K[Pt (DMSO) Cl3] with 1-??-D-ribofuranosyl-1,2,4-triazole-3-carboxamide (Ribavirin) and its deoxy-analogue (deoxyribavirin). The preparation of 1-(2'-deoxy-?-D-ribofuranosyl) -1,2,4-triazole-3-carboxamide was also performed through a four-step procedure, protection of 3', 5'-dihydroxyl group of Ribavirin with 1,3-dichloro-1,1,3,3-tetraisopropyldisiloxane (TPDS-Cl), phenoxythio-carbonylation of the 2'-hydroxyl group of 3', 5'-O-TPDS-Ribavirin with phenoxythiocarbonyl-chloride (PTC-Cl), reduction of 2′-O-phenoxythiocarbonyl ester of 3', 5'-O-TPDS-Ribavirin with tri-n-butyltin hydride and AIBN, deprotection of 3', 5'-O-TPDS-Ribavirin with tetrabutylammon-ium fluoride in THF.

关键词： Platinum(II) complexes ribavirin and deoxyribavirin nucleobase platination complexation reaction antitumor agents

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CFD simulation of bubbling and collapsing characteristics in a gas-solid fluidized bed

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Petroleum Science 2009年第1期6卷 69-75页

作者： pei pei Zhang Kai Lu Erwei wen Dongsheng State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing 102249 China School of Engineering and Materials Science Queen Mary University of London Mile End Road London UK E1 4NS

Computational Fluid Dynamics （CFD） has become an alternative method to experiments for understanding the fluid dynamics of multiphase flow. A two-fluid model, which contains additional terms in both the gas- and solid-phase momentum equations, is used to investigate the fluidization quality in a fluidized bed. A case study for quartz sand with a density of 2,660 kg/m^3 and a diameter of 500 μm, whose physical property is similar to a new kind of catalyst for producing clean fuels through the residue fluid catalytic cracking process, is simulated in a two-dimensional fluidized bed with 0.57 m width and 1.00 m height. Transient bubbling and collapsing characteristics are numerically investigated in the platform of CFX 4.4 by integrating user-defined Fortran subroutines. The results show that the fluidization and collapse process is in fair agreement with the classical theory of Geldart B classification, but the collapse time is affected by bubbles at the interface between the dense phase and freeboard.

关键词： Fluidized bed CFD simulation bubbling and collapsing behaviors

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