Browsing by Author "Canpolat F."

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    Prediction of ratio of mineral substitution in the production of low-clinker factored cement by artificial neural network
    (Association for Scientific Research, 2003) Canpolat F.; Yilmaz K.; Ata R.; Köse M.M.
    Artificial Neural Networks (ANN) has been widely used to solve some of the problems in science and engineering, which requires experimental analysis. Use of ANN in civil engineering applications started in late eighties. One of the important features of the ANN is its ability to learn from experience and examples and then to adapt with changing situations. Engineers often deal with incomplete and noisy data, which is one of the areas where ANN can easily be applied. Dealing with incomplete and noisy data is the conceptual stage of the design process. This paper shows practical guidelines for designing ANN for civil engineering applications. ANN is in cement industry: in the production of low-clinker factored cement, and in the derivation of composition of natural and artificial puzzolans in the production of high performance cement and concrete. By using ANN, a study to find out the optimum ratio of substitution and compression strengths was carried out.
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    Use of zeolite, coal bottom ash and fly ash as replacement materials in cement production
    (2004) Canpolat F.; Yilmaz K.; Köse M.M.; Sümer M.; Yurdusev M.A.
    In this research, the effects of zeolite, coal bottom ash and fly ash as Portland cement replacement materials on the properties of cement are investigated through three different combinations of tests. These materials are substituted for Portland cement in different proportions, and physical properties such as setting time, volume expansion, compressive strength and water consistency of the mortar are determined. Then, these physical properties are compared with those of PC 42.5. The results showed that replacement materials have some effects on the mechanical properties of the cement. The inclusion of zeolite up to the level of 15% resulted in an increase in compressive strength at early ages, but resulted in a decrease in compressive strength when used in combination with fly ash. Also, setting time was decreased when zeolite was substituted. The results obtained were compared with Turkish Standards (TS), and it was found that they are above the minimum requirements. © 2004 Published by Elsevier Ltd.
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    Sulfate resistance of mortars with and without silica fume and natural pozzolan
    (2007) Canpolat F.; Yurdusev M.A.; Targan S.; Yilmaz K.
    An investigation was carried out on the effect of sulfate attack on the sulfate durability of mortars produced with natural zeolite and silica fume having pozzolanic character. Experiments were accomplished on the standard Rilem sand and portland cement mortars where the cement was replaced by various rates of natural zeolite (Z) and silica fume (SF) separately and together. 5% sodium sulfate solution and 5% magnesium sulfate solution were 5% sulfate exposures of mortars were initiated after 28 days of lime saturated water curing, compressive strength and density were determined at the beginning of exposure and at the 2nd, 7th, 28th, 90th days. Water and solutions were renewed after each period of experimental time, 14 days. Mass changes were determined at the time of renewing the solutions. The effects of sodium sulfate solutions on the properties of mortars were related to the zeolite and silica fume ratio. It is found that zeolite and silica fume replacement had caused significant increase in sulfate durability of mortars even at the highest sulfate concentration up to 90 days of exposure. The durability to sulfate attack was obtained with silica fume replacement 5-10%, but strength loss of 10-15% can be expected. Mortars with SF and Z were damaged in magnesium sulfate solution. The compressive strengths decreased with increasing SF and Z content. The test results showed that the use of Z and SF in concrete exposed to magnesium sulfate environment is not recommended. © 2007 Taylor & Francis Group, London.
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    Extending experimental data to investigate phosphogypsume use in light brick by Artificial Neural Networks
    (2007) Yurdusev M.A.; Kumanlioǧlu A.A.; Abali Y.; Zeybek M.S.; Canpolat F.
    In this study, usability of wastes produced in phosphoric acid plants in structural brick manufacture has been investigated. A series of experiments for three different material combinations namely original waste plus normal brick clay, washed waste plus normal brick clay and normal brick clay with no additive were carried out to achieve this end. The results have shown that the industrial wastes considered improve the performance of the bricks. However, the results have also shown that further investigations are needed to explore the effects of interim or outer values on the performance of the bricks. To active that end, a neural experimental study is adopted. The outcome of these artificial tests have provided the appropriate values for the waste addition rate, firing speed and firing temperature. © 2007 Taylor & Francis Group, London.
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    Clinical characteristics, quality of life and risk factors for severity in palmoplantar pustulosis: a cross-sectional, multicentre study of 263 patients
    (John Wiley and Sons Inc, 2022) Sarıkaya Solak S.; Kara Polat A.; Kilic S.; Oguz Topal İ.; Saricaoglu H.; Karadag A.S.; Canpolat F.; Kartal S.P.; Deveci B.N.; Kacar N.; Polat Ekinci A.; Guner R.; Polat M.; Dogan G.; Guler Ozden M.; Bulbul Baskan E.; Ozaydin Yavuz G.; Adisen E.; Gulekon A.; Tanribilir M.E.; Yilmaz O.; Akman Karakas A.; Ozturk P.; Didar Balci D.; Gonulal M.; Yondem H.; Turel Ermertcan A.; Sendur N.; Topyildiz H.; Korkmaz S.; Alpsoy E.
    Background: Palmoplantar pustulosis (PPP) is a rare, chronic, inflammatory skin disease characterized by sterile pustules on palmar or plantar areas. Data on PPP are scarce. Aim: To investigate the clinical characteristics and risk factors for disease severity in a large cohort of Turkish patients with PPP. Methods: We conducted a cross-sectional, multicentre study of patients with PPP recruited from 21 tertiary centres across Turkey. Results: In total, 263 patients (165 women, 98 men) were evaluated. Most patients (75.6%) were former or current smokers. The mean Palmoplantar Pustulosis Area and Severity Index (PPPASI) was 8.70 ± 8.06 and the mean Dermatology Life Quality Index (DLQI) score was 6.87 ± 6.08, and these scores were significantly correlated (r = 0.52, P < 0.001). Regression analysis showed that current smoking was significantly associated with increased PPPASI (P = 0.03). Coexisting psoriasis vulgaris (PsV) was reported by 70 (26.6%) patients. Male sex prevalence, PPP onset incidence, disease duration, DLQI, and prevalence of nail involvement and psoriatic arthritis (PsA) were significantly increased among patients with PPP with PsV. Of the 263 patients, 18 (6.8%) had paradoxical PPP induced by biologic therapy, and these patients had significantly increased mean DLQI and prevalence of PsA (r = 0.03, P = 0.001). Conclusion: Our data suggest that smoking is a risk factor for both PPP development and disease severity. Patients with PPP with PsV present distinct clinical features and patients with biologic therapy-induced paradoxical PPP have reduced quality of life and are more likely to have PsA. © 2021 British Association of Dermatologists.