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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

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

The critical loading for lateral buckling of continuous welded rail

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2005年第8期6卷 878-885页

作者： SUNG Wen-pei shih ming-hsiang LIN Cheng-I GO Cheer Germ Department of Landscape Design and Management National Chin-Yi Institute of Technology Taiwan 41111 China Department of Construction Engineering National Kaoshiang First University of Science and Technology Taiwan 824 China Department of Fire Science. Wu-Feng Institute of Technology Ming-Hsiung Chiayi Taiwan 621 China Department of Civil Engineering National Chung Hsing University Taiwan 40227 China

The most significant differences between continuous welded rails （CWRs） and general split-type connectors are axial compression in the longitudinal direction, buckling stability and other issues generated under the influence of thermal effect. Under thermal effect, a dynamical behavior similar to that of a beam fixed on two sides occurs in the central locked area of the welded rail, as there is axial compression but no possibility of sliding. Continuous welded rails do not contract or expand, and are supported by the dynamical system made up of ballasts and rail clips. The rail-support system mentioned above has the features of non-uniform material distribution and uncertainty of construction quality. Due to these facts, the dynamics method based on the linear elastic hypothesis cannot correctly evaluate the rail＇s buckling conditions. This study is aimed at applying Finite Difference Method （FDM） and Monte Carlo Random Normal Variables Method to the analysis of welded rail＇s buckling behavior during the train＇s acceleration and deceleration, under thermal effect and uncertain factors of ballast and rail clips. The analysis result showed that buckling occurs under the combined effect of thermal effect and the train＇s deceleration force co-effect and the variance ratio of ballast and rail clips is over 0.85, or under the combined effect of thermal effect and the train＇s acceleration force when the ariance ratio is over 0.88.

关键词： Thermal effect Finite Difference Method Monte Carlo Method Buckling load

Fuzzy finish time modeling for project scheduling

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第12期11卷 946-952页

作者： Yu-chuan LIU shih-ming YANG Yu-te LIN Department of Information Management Tainan University of Technology Taiwan Tainan Department of Aeronautics and Astronautics National Cheng Kung University Taiwan Tainan

This research aims at developing a new fuzzy activity finish time estimation model for project scheduling *** the application of the fuzzy quality function deployment (FQFD) and fuzzy analytic hierarchy process (FAHP) methods,the degree of fuzziness for every project activity is calculated in accordance with considerations of project *** uncertainties are measured by the risk level of such project-related characteristics as time limit,activity start time,budget,manpower,technological difficulty,and facility *** this paper,rather than applying the de-fuzzification technique to obtain the crisp activity duration for project scheduling,the fuzzy finish time estimation method for every activity is proposed based on the degree of *** corresponding fuzzy activity duration time plot is also developed in a new fuzzy Gantt *** proposed model can provide a reasonable fuzzy finish time estimation for every activity,while most scheduling methods only provide the finish time of the entire *** to existing models,this time estimation model and its corresponding Gantt chart are predicted to have higher reliability and practical application in project management and scheduling.

关键词： Fuzzy quality function deployment (FQFD) Fuzzy analytic hierarchy process (FAHP) Fuzzy Gantt chart Project management Project scheduling

Efficacy of Frankincense and Myrrha in Treatment of Acute Interstitial Cystitis/Painful Bladder Syndrome

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Chinese Journal of Integrative Medicine 2020年第7期26卷 519-526页

作者： Yung-hsiang Chen Wen-Chi Chen Kao-Sung Tsai Po-Len Liu ming-Yen Tsai Tzu-Chun Lin shih-Chieh Yu Huey-Yi Chen Graduate Institute of Integrated Medicine College of MedicineResearch Center for Chinese Medicine and AcupunctureChinese Medicine Research CenterChina Medical UniversityTaichungTaiwanChina Departments of Medical Research Urologyand Obstetrics and GynecologyChina Medical University HospitalTaichungTaiwanChina Department of Psychology College of Medical and Health ScienceAsia UniversityTaichungTaiwanChina Department of Applied Cosmetology Master Program of Cosmetic ScienceHungkuang UniversityTaiwanChina Department of Respiratory Therapy College of MedicineKaohsiung Medical UniversityKaohsiungTaiwanChina Department of Chinese Medicine Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of MedicineKaohsiungTaiwanChina Department of Dermatology Chung Shan University HospitalInstitute of MedicineSchool of MedicineChung Shan Medical UniversityTaichungTaiwanChina Department of Neurology Kuang Tien General HospitalTaichungTaiwanChina

Objective:To investigate the efficacy of frankincense and myrrha in the treatment of acute interstitial cystitis/painful bladder syndrome(IC/PBS).Methods:The effects of frankincense and myrrha on the proliferation and migration of primary human urothelial cells(HUCs)were assessed in *** the animal study,48 virgin female rats were randomized into 4 groups(12 in each group):(1)control group(saline-injected control);(2)cyclophosphamide(CYP)group(intraperitoneal injected 150 mg/kg CYP);(3)CYP+pentosan polysulfate sodium group(orally received 50 mg/kg pentosan polysulfate sodium);and(4)CYP+frankincense and myrrha group[orally received frankincense(200 mg/kg)and myrrha(200 mg/kg)].Rats orally received pentosan polysulfate sodium or frankincense and myrrha on day 1,2,and *** experiments were performed on day *** and cystometry assessment behavior test were *** interval values were assessed in rats under ***,immunohistochemistry and Western blot were used to confirm the location and level,respectively,of cell junction-associated protein zonula occludens-2(ZO-2)***:Low dose frankincense and myrrha increased cell proliferation and migration in HUCs compared with control(P<0.05).Rats with acute IC/PBS rats exhibited lower voiding interval values,pain tolerance,and ZO-2 expression(P<0.05).Voiding interval values and pain tolerance were higher in the frankincense and myrrha group than CYP group(P<0.05).ZO-2 expression in the bladder was increased in the CYP+pentosan polysulfate and frankincense+myrrha groups compared with the CYP-induced acute IC/PBS group(P<0.05).Conclusion:frankincense and myrrha modulate urothelial wound healing,which ameliorates typical features of acute IC/PBS in rats.

关键词： frankincense myrrha acute interstitialcystitis painful bladder syndrome cell junction-associated protein

Estimating overland flow erosion capacity using unit stream power

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International Journal of Sediment Research 2009年第1期24卷 46-62页

作者： Hui-ming shih Chih Ted YANG Hydraulic Engineer Martin/Martin Inc. 12499 West Colfax Avenue Lakewood Colorado 80215 USA Borland of Water Resources Department of Civil and Environmental Engineering Colorado State UniversityFort Collins

Soil erosion caused by water flow is a complex problem. Both empirical and physically based approaches were used for the estimation of surface erosion rates. Their applications are mainly limited to experimental areas or laboratory studies. The maximum sediment concentration overland flow can carry is not considered in most of the existing surface erosion models. The lack of erosion capacity limitation may cause over estimations of sediment concentration. A correlation analysis is used in this study to determine significant factors that impact surface erosion capacity. The result shows that the unit stream power is the most dominant factor for overland flow erosion which is consistent with experimental data. A bounded regression formula is used to reflect the limits that sediment concentration cannot be less than zero nor greater than a maximum value. The coefficients used in the model are calibrated using published laboratory data. The computed results agree with laboratory data very well. A one dimensional overland flow diffusive wave model is used in conjunction with the developed soil erosion equation to simulate field experimental results. This study concludes that the non-linear regression method using unit stream power as the dominant factor performs well for estimating overland flow erosion capacity.

关键词： Overland flow Soil erosion Unit stream power Raindrop impact Non-linear regression Diffusive wave

Development of micro milling force model and cutting parameter optimization

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中国有色金属学会会刊：英文版 2012年第S3期22卷 851-858页

作者： shih-ming WANG Da-fun CHEN Min-chang JANG Shambaljamts TSOOJ Department of Mechanical Engineering Chung Yuan Christian University

Taking the minimum chip thickness effect,cutter deflection,and spindle run-out into account,a micro milling force model and a method to determine the optimal micro milling parameters were *** micro milling force model was derived as a function of the cutting coefficients and the instantaneous projected cutting area that was determined based on the machining parameters and the rotation trajectory of the cutter *** an allowable micro cutter deflection is defined,the maximum allowable cutting force can be *** optimal machining parameters can then be computed based on the cutting force model for better machining efficiency and *** verify the proposed cutting force model and the method to determine the optimal cutting parameters,micro-milling experiments were conducted,and the results show the feasibility and effectiveness of the model and method.

关键词： micro-milling cutting force spindle run out cutter deflection optimal parameter

Heterojunction Photocatalysis of ZnSe on F and N doped Nano-scaled TiO2

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Heterojunction Photocatalysis of ZnSe on F and N doped Nano-...

Relationship between seminal plasma zinc concentration and spermatozoa-zona pellucida binding and the ZP-induced acrosome reaction in subfertile men

The Eighth Chinese Optoelectronics Symposium

作者： ming-Kwei Lee Tsung-hsiang shih Department of Electrical Engineering National Sun Yat-sen University Kaohsiung80424 Department of Electrical Engineering National Sun Yat-sen University Kaohsiung 80424

High quality nano-scaled fluorine and nitrogen co-doped anatase phase titanium oxide can be obtained from the conversion of ammonium oxotrifluorotitanate by thermal treatment. The photocatalytic activity of titanium oxide treated at 800℃ shows the highest photocatalytic activity and is about 1.3 times of commercial P-25. The heterojunction of zinc selenide/titanium oxide prepared by metal organic vapor phase epitaxy shows 2.0 times the photocatalytic activities of commercial P-25. In this study, both nano-scaled titanium oxide and zinc selenide/titanium oxide heterojunction show one to one correspondence between carrier lifetime and photocatalytic activity.

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Asian Journal of Andrology 2009年第4期11卷 499-507页

作者： De-Yi Liu Boon-shih Sie ming-Li Liu Franca Agresta HW Gordon Baker Department of Obstetrics and Gynaecology University of Melbourne Royal Women ＇s Hospital Parkville 3052 Australia Reproductive Services and Melbourne IVF Royal Women＇s Hospital Parkville 3052 Australia

The aim of this study was to determine the relationship between seminal zinc concentration and spermatozoazona pellucida （ZP） binding and the ZP-induced acrosome reaction （ZPIAR） in subfertile men. Semen analyses and seminal zinc concentration assessments were carried out according to the World Health Organization manual for 458 subfertile men. A spermatozoa-ZP interaction test was carried out by incubating 2 × 10^6 motile spermatozoa with a group of four unfertilized oocytes obtained from a clinical in vitro fertilization programme. After 2 h of incubation, the number of spermatozoa bound per ZP and the ZPIAR of ZP-bound spermatozoa were examined. The effect of adding 0.5 mmol L^-1 zinc to the media on the ZPIAR of spermatozoa from normozoospermic men was also tested in vitro. Seminal zinc concentration positively correlated with sperm count and duration of abstinence, but negatively correlated with semen volume. On analysis of data from all participants, both spermatozoa-ZP binding and the ZPI- AR were significantly correlated with sperm motility and normal morphology, but not with seminal zinc concentration. However, in men with normozoospermic semen, the seminal zinc concentration was significantly higher in men with defective ZPIAR （〈 16%） than in those with normal ZPIAR （ ≥ 16% ）（P 〈 0.01）. The addition of 0.5 mmol L^-1 zinc to the culture media had no effect on spermatozoa-ZP binding, but significantly reduced the ZPIAR in vitro （P 〈 0. 001）. In conclusion, seminal zinc concentration is correlated with sperm count and the duration of abstinence in subfertile men. In men with normozoospermic semen, high seminal zinc concentration may have an adverse effect on the ZPIAR.

关键词： semen analysis seminal zinc spermatozoa-zona pellucida interaction subfertile men