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Local joint flexibility equations for Y-T and K-type tubular joints
Asgarian, Behrouz,Mokarram, Vahid,Alanjari, Pejman Techno-Press 2014 Ocean systems engineering Vol.4 No.2
It is common that analyses of offshore platforms being carried out with the assumption of rigid tubular joints. However, many researches have concluded that it is necessary that local joint flexibility (LJF) of tubular joints should be taken into account. Meanwhile, advanced analysis of old offshore platforms considering local joint flexibility leads to more accurate results. This paper presents an extensive finite-element (FE) based study on the flexibility of uni-planner multi-brace tubular Y-T and K-joints commonly found in offshore platforms. A wide range of geometric parameters of Y-T and K-joints in offshore practice is covered to generate reliable parametric equations for flexibility matrices. The formulas are obtained by non-linear regression analyses on the database. The proposed equations are verified against existing analytical and experimental formulations. The equations can be used reliably in global analyses of offshore structures to account for the LJF effects on overall behavior of the structure.
Alireza Khataee,Shabnam Saadi,Behrouz Vahid,주상우 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.35 No.-
The sonochemically synthesized Ho-doped ZnO nanoparticles were characterized by XRD, SEM, TEM,and XPS techniques. The sonocatalytic degradation of Reactive Orange 29 (RO29) was greater than thatwith sonolysis alone. DE% declines with the addition of chloride, carbonate, sulfate, and tert-butanol asradical scavengers. Addition of potassium periodate, peroxydisulfate, and hydrogen peroxide asenhancers improves DE%. The results demonstrate proper reusability of the doped sonocatalyst. Degradation intermediates were identified by gas chromatography–mass spectrometry (GC–MS). Usingnonlinear regression analysis, an empirical kinetic model was developed to predict the pseudo-first-order constants (kapp) as a function of the operational parameters.
Alireza Khataee,Peyman Gholami,Behrouz Vahid 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.50 No.-
Plasma-treated hematite (PTH) nanostructures were produced from natural hematite (NH) using N2plasma considering its cleaning and sputtering effects which lead to larger surface area. The NH and PTHwere characterized by XRD, FT-IR, SEM, EDX, XPS, and BET methods. The catalytic activity of the PTH inheterogeneous Fenton-like process was higher than the NH for degradation of Acid Red 17. The GC–Masstechnique was used to recognize some of the intermediates and a possible degradation pathway wasproposed. Environment-friendly preparation of the catalyst, insignificant leaked iron concentration andsuccessive usages at milder pH were the substantial advantages of the PTH.
Alireza Khataee,주상우,Amirreza Khataee,Mehrangiz Fathinia,Behrouz Vahid 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.6
To well describe the photoassisted-electrochemical process for treatment of the contaminated water, a new kinetic model was established based on the intrinsic reactions of the process. The kinetic model correlated apparent kinetic constants to operational parameters including applied current, initial dye concentration and flow rate. Degradation experiments were carried out with boron-doped diamond (BDD) anode and carbon nanotubes–polytetrafluoroethylene (CNTs–PTFE) cathode. The proposed kinetic model was validated by the experiments of C.I. Acid Blue 92 degradation in aqueous solution. The goodness of fitting (R2 = 0.96) demonstrated that the new model could describe both the kinetics and the hydrodynamics of the photo-electrochemical system.
Alireza Khataee,Fatemeh Salahpour,Mehrangiz Fathinia,Behnam Seyyedi,Behrouz Vahid 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.26 No.-
Treatment of C.I. Acid Red 17 (AR17) by heterogeneous photo-Fenton-like process was studied using calcined laterite soil as an iron source. A complete characterization was performed to explain some of the properties of the used catalyst. Comparing the processes of heterogeneous Fenton-like and photo- Fenton-like, revealed that using heterogeneous photo-Fenton-like led to the highest decolorization efficiency (94.71% at 120 min). Experimental results indicated that the heterogeneous photo-Fenton-like process could be explained in terms of the Langmuir–Hinshelwood kinetic model. The main roles of hydroxyl radicals in degradation process were investigated by adding of various radical scavengers