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Free vibration analysis of angle-ply laminated composite and soft core sandwich plates
Meriem Sahla,Hayat Saidi,Kada Draiche,Abdelmoumen Anis Bousahla,Fouad Bourada,Abdelouahed Tounsi 국제구조공학회 2019 Steel and Composite Structures, An International J Vol.33 No.5
In this work, a simple four-variable trigonometric shear deformation model with undetermined integral terms to consider the influences of transverse shear deformation is applied for the dynamic analysis of anti-symmetric laminated composite and soft core sandwich plates. Unlike the existing higher order theories, the current one contains only four unknowns. The equations of motion are obtained using the principle of virtual work. The analytical solution is determined by solving the eigenvalue problem. The influences of geometric ratio, modular ratio and fibre angle are critically evaluated for different problems of laminated composite and sandwich plates. The eigenfrequencies obtained using the current theory are verified by comparing the results with those of other theories and with the exact elasticity solution, if any.
Anis Sofia Sufian,Noorasikin Samat,Meor Yusoff Meor Sulaiman,Wilfred Paulus 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.7 No.1
The investigation on the influences of alumina (Al2O3) particles in nano-sized retrieved from Aluminium (Al) dross was conducted on the tensile, thermal and wear properties of polypropylene (PP) composites. The thermal decomposition method was used to synthesise the micro α-Al2O3 particles from Al-dross, was followed by the wet-milling method to produce the nano α-Al2O3. The PP composites (nano and micro α-Al2O3 particles) were prepared via melt compounding followed by compression molding. The coupling agent was also added to facilitate the particle dispersion. The tensile tests showed the maximum tensile strength and Young’s modulus of both composites to be corresponding to the samples containing 5 wt% of α-Al2O3. The superiority of nano α-Al2O3 on improving the property of PP had also been evident in the abrasive wear performance. A small amount of α-Al2O3 had been adequate in enhancing the thermal stability of PP than that of neat PP. The study on tensile and worn surface with SEM had revealed better adhesion and interaction between the filler and matrix in composites that were treated with coupling agent. The recovery of nano α-Al2O3 particles from Al-dross potentially decreases the quantity of harmful solid waste and can be an effective alternative filler for thermoplastics.
Comments on "A Goodness of Fit Approach to Major Life Testing Problems" by Ahmad et al. (2001)
Anis, M.Z. The Korean Reliability Society 2009 International Journal of Reliability and Applicati Vol.10 No.1
We comment on a new testing procedure for testing exponentiality against different ageing classes. We show that the proposed test is inappropriate at least for two alternatives. We point out the subtle flaw in their argument.
ANIS, Marjukah,WIDJI, Astuti,FAJAR, Supanto Korea Distribution Science Association 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.9
This study investigates the effect of serv-qual and reputation on customer loyalty through the trust of deposit customers in Micro Finance Institutions. The population was deposit customers at BMT distributed into 5 provinces of the Special Region of Yogyakarta, and a survey was conducted from January 2021 to February 2022. The probability random sampling technique was used to select the final sample, and a total of 221 responses were collected using a questionnaire. Technical data analysis was done using the Structural Equation Modeling (SEM), supported by AMOS 22.0 program. The results showed that serv-qual and reputation have a positive and significant impact on the trust and loyalty of deposit customers at BMT. Customers positively and significantly impact the relationship between serv-qual and reputation on customer loyalty. The biggest contribution to loyalty was generated by the variable customer trust (0.399), followed by service quality (0.359) and reputation (0.166). Micro Finance Institution needs to improve the management of deposit customers by improving serv-qual, reputation, and customer trust and conduct comparative research between conventional financial institutions and other informal financial service institutions.
( Anis H. Aslam ) 대한피부과학회 2015 대한피부과학회 학술발표대회집 Vol.67 No.1
Psoriasis is a chronic inflammatory disease of the skin that has a major effect on an individual’s mental and physical wellbeing. Depending on choice of treatment, healthcare resource use and costs can be substantial. With the rapid pace of new drug discoveries, there are also increasing pressures on the healthcare systems to adopt new drugs and other medical innovations. To prioritize spending, economic evaluations should be utilized to determine the rational allocation of scarce resources given the competing demands from various diseases. This presentation will review the key principles of economic evaluation, cost-effectiveness analysis, and then focus its application on evaluation the current treatments available for psoriasis. Since most treatments need to be compared with each other from an economic perspective yet the evidence on their efficacy is based on pairwise placebo comparisons, we will briefly review principles of comparative effectiveness analysis and how it is linked to economic evaluation. We will conclude with a comparison of published cost-effectiveness analyses of psoriasis treatments.
Anis Bousbia Salah,Jacques Vlassenbroeck 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.3
Coolant mixing under natural circulation flow regime constitutes a key parameter that mayplay a role in the course of an accidental transient in a nuclear pressurized water reactor. This issue has motivated some experimental investigations carried out within the OECD/NEA PKL projects. The aim was to assess the coolant mixing phenomenon in the reactorpressure vessel downcomer and the core lower plenum under several asymmetric steadyand unsteady flow conditions, and to provide experimental data for code validations. Formerstudies addressed the mixing phenomenon using, on the one hand, one-dimensionalcomputational approaches with cross flows that are not fully validated under transientconditions and, on the other hand, expensive computational fluid dynamic tools thatare not always justified for large-scale macroscopic phenomena. In the current framework,an unsteady coolant mixing experiment carried out in the Rossendorf coolant mixingtest facility is simulated using the three-dimensional porous media capabilities ofthe thermalehydraulic system CATHARE code. The current study allows highlighting thecurrent capabilities of these codes and their suitability for reproducing the main phenomenaoccurring during asymmetric transient natural circulation mixing conditions.
Anis I. Mohabeddine,Cyrus Eshaghi,José A.F.O. Correia,José M. Castro 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.43 No.4
Recent experimental studies showed that deep steel I-shaped profiles classified as high ductility class sections in seismic design international codes exhibit low deformation capacity when subjected to cyclic loading. This paper presents an innovative retrofit solution to increase the rotation capacity of beams using bonded carbon fiber reinforced polymers (CFRP) patches validated with advanced finite element analysis. This investigation focuses on the flexural cyclic behaviour of I-shaped hot rolled steel deep section used as beams in moment-resisting frames (MRF) retrofitted with CFRP patches on the web. The main goal of this CFRP reinforcement is to increase the rotation capacity of the member without increasing the overstrength in order to avoid compromising the strong column-weak beam condition in MRF. A finite element model that simulates the cyclic plasticity behavior of the steel and the damage in the adhesive layer is developed. The damage is modelled using the cohesive zone modelling (CZM) technique that is able to capture the crack initiation and propagation. Details on the modelling techniques including the mesh sensitivity near the fracture zone are presented. The effectiveness of the retrofit solution depends strongly on the selection of the appropriate adhesive. Different adhesive types are investigated where the CZM parameters are calibrated from high fidelity fracture mechanics tests that are thoroughly validated in the literature. This includes a rigid adhesive commonly found in the construction industry and two tough adhesives used in the automotive industry. The results revealed that the CFRP patch can increase the rotation capacity of a steel member considerably when using tough adhesives.
Modification of alumina support with TiO2-P25 in CO2 reforming of CH4
Anis H. Fakeeha,Ahmed E. Abasaeed,Ahmed S.A. Al-Fatesh 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1
Catalyst activity and stability for CO2 reforming of CH4 depends specifically upon the support and the active metal. A side reaction of dry reforming of methane is the decomposition to carbon that covers the Ni particles causing catalyst deactivation. Hence, an appropriate combination of Ni with support is needed to allow for long term stable operation. In this paper, CO2 reforming of CH4 is studied by investigating the effect of addition of TiO2-P25 separately to g-Al2O3 and a-Al2O3 supports used for nickel based catalyst. The reforming reactions are performed using (CO2:CH4) feed ratio of 1:1 and reaction temperature range of 500–800 8C. Both fresh and used catalysts are characterized by SEM and TGA techniques. It is found when a-Al2O3 support is modified with 20 wt% TiO2-P25, the catalyst activity and stability is enhanced. The conversion rates of CH4 and CO2 without and with 20 wt% TiO2-P25,respectively, are changed from 72.3% to 76.7% and 73.3% to 81.2%, respectively, and, most importantly,carbon formation is reduced from 28.1 to 12.8, respectively. However, when g-Al2O3 support is modified with TiO2-P25, the catalyst activity is enhanced with simultaneous increase in carbon formation.