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Influence of recycled polyethylene terephthalate fibres on plastic shrinkage and mechanical properties of concrete

Frontiers of Structural and Civil Engineering 2022年第6期16卷 792-802页

作者： necatözaşik Özgür EREN Department of Civil Engineering Eastern Mediterranean UniversityMersin 99628Turkey

Polyethylene terephthalate bottles production has drastically increased year after year due to high versatility of polyethylene terephthalate plastics and considerable consumption of *** tandem with that increase,the major concern of society has been the improper disposal of this non-biodegradable material to the *** deal with this concern,recycled polyethylene terephthalate bottles were incorporated in concrete as fibre reinforcements in this *** objective of this research is to evaluate the mechanical properties of recycled polyethylene terephthalate fibre reinforced concrete(RPFRC)in comparison with control concrete without *** terephthalate fibres with three different diameters(0.45,0.65,and 1.0 mm)and two lengths(20 and 30 mm)were added at various proportions(0.5%,1.0%,1.5%and 2.0%)by volume of concrete in order to determine the effect of fibres initially on compressive,flexural and splitting tensile strengths of *** results revealed that none of the fibres have detrimental effects up to 1%volume fraction,however further addition caused slight reductions on mechanical properties in some *** shrinkage resistance and impact resistance tests were also performed according to related *** terephthalate fibres were observed to have marked improvements on those *** a good performance could be attributed primarily to the bridging effect of fibres.

关键词： recycled PET fibre-reinforced concrete mechanical properties plastic shrinkage impact energy

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Global existence and decay of solutions for the generalized bad Boussinesq equation

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Applied Mathematics(A Journal of Chinese Universities) 2013年第3期28卷 253-268页

作者： Hatice Taskesen necat Polat Abdulkadir Ertas Department of Statistics Yuzuncu Yil UniversityVan 65080 Turkey Department of Mathematics Dicle UniversityDiyarbakir 21280 Turkey

In this paper, we consider the global existence of solutions for the Cauchy problem of the generalized sixth order bad Boussinesq equation. Moreover, we show that the supremum norm of the solution decays algebraically to zero as （1 ＋ t）-（1/7） when t approaches to infinity, provided the initial data are sufficiently small and regular.

关键词： bad Boussinesq equation global existence asymptotic behavior oscillatory integral.

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Existence and Asymptotic Behavior of Solution of Cauchy Problem for the Damped Sixth-order Boussinesq Equation

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Acta Mathematicae Applicatae Sinica 2015年第3期31卷 735-746页

作者： necat POLAT Erhan PSKN Dicle University Department of Mathematics

We consider the existence, both locally and globally in time, as well as the asymptotic behavior of solutions for the Cauchy problem of the sixth-order Boussinesq equation with damping term. Under rather mild conditions on the nonlinear term and initial data, we prove that the above-mentioned problem admits a unique local solution, which can be continued to a global solution, and the problem is globally ***, under certain conditions, we prove that the global solution decays exponentially to zero in the infinite time limit.

关键词： Boussinesq equation Cauchy problem global solution asymptotic behavior damping term

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Increased Oxidant Stress and Inflammation in Patients with Chronic Schizophrenia

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International Journal of Clinical Medicine 2012年第5期3卷 368-376页

作者： Aysenur Yegin Nurullah Ay Ozgur Aydin Nedim Yargici Esin Eren necat Yilmaz Central Laboratory Ataturk Hospital of Ministry of Health Antalya Turkey Central Laboratory Department of Biochemistry Antalya Educational and Research Hospital Antalya Turkey Department of Psychiatry Antalya Educational and Research Hospital Antalya Turkey

Background: Several lines of evidence, including postmortem studies, suggest increased oxidative stress and inflammation in patients with schizophrenia. Alteration of oxidative stress markers has been reported in schizoprenia studies, but with inconsistent results. Oxidized low-density lipoproteins (oxLDL) have been reported to be capable of eliciting neurocytotoxicity. On the other hand, paraoxonase (PON1), an arylesterase(ARE), plays a role in protection against oxidative modifications of LDL and is considered to be one of the antioxidant enzymes. There are no studies showing the changes in oxidative stress and inflammation together, nor the activities of PON1 and ARE in schizophrenic patients. In this study, we examined PON1, ARE activities and oxidative/anti-oxidative markers in patients with chronic schizophrenia and healthy controls. Methods: We recruited 30 male chronic schizophrenic patients and 30 male healthy control subjects and examined C-reactive protein(CRP), fibrinogen, PON1, ARE and plasma total antioxidant status (TAS) and total oxidant status (TOS), oxidative stress index(OSI) in both groups. Schizophrenia symptoms were assessed using the positive and negative syndrome scale (PANSS). The related routine lipid profile parameters including HDL were also examined. Results: Patients had significantly higher CRP, fibrinogen, TOS and OSI levels;but the patients and control subjects did not differ on activities of the antioxidant enzymes PON1 and ARE. Interestingly, there were not any group differences in the lipid profile parameters except the triglyceride levels, that increased significantly in the patient group. Conclusions: In the present study, reporting the ARE activities besides the PON1 activities in schizophrenic patients for the first time, we showed that PON1 and ARE enzyme activities were not statistically different in patients with chronic schizophrenia. This study provides additional evidence of increased oxidative stress and inflammation in

关键词： Oxidative Stress Antioxidant Status Inflammation Paraoxonase Schizophrenia

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