YOL AGREGALARINDA NANOTEKNOLOJİ KULLANIMI

Ülkemizde halen yapılmakta olan bölünmüş yolların inşaatında sathi kaplama kullanılmaya devam etmektedir. Bununla beraber, Karayolları Genel Müdürlüğü (KGM) bir yandan da bölünmüş yollardaki sathi kaplamaları bitümlü sıcak karışıma (BSK) dönüştürmeye de başlamıştır. Bu durum ülkemizde BSK konusunda yapılacak imalatları ve akademik araştırmaları da artıracaktır. Asfalt betonu karışımlar agrega ve bitüm ile imal edilirler. Agrega olarak genellikle kireçtaşı ve son yıllarda bazalt kullanılmaktadır. Bitüm olarak ise, TÜPRAŞ ve diğer rafinerilerden elde edilen çeşitli penetrasyon ve viskozitelerde bitüm kullanılmaktadır. BSK dayanımını artırma çalışmalarında sadece agrega türü ve bitüm özellikleri dikkate alınmaktadır. Bu çalışmada, yol agregalarında nano teknoloji kullanımı anlatılmıştır. Nano teknoloji ile birlikte plazma kaplama yöntemlerinden bahsedilmiştir. Sonuç olarak nano teknolojinin üstyapı malzemeleri alanında kullanılabilirliği ortaya çıkarılmıştır

Geleneksel Asfalt Beton ve Genleştirilmiş Kil Agrega ile Üretilmiş Hafif Asfalt Betonun Çok Yönlü Karşılaştırılması

Bu çalışmada kırma taş agrega (KTA) kullanılarak geleneksel olarak üretilmiş asfalt beton numuneler ve yapay bir hafif agrega olan genleştirilmiş kil agrega (GKA) ile üretilmiş hafif asfalt beton numuneler üzerinde çok yönlü incelemeler yapılarak bir takım özellikler karşılaştırılmıştır. Üretilen numuneler üzerinde öncelikle bazı fiziksel deneyler yapılmış ve her bir numunenin fiziksel özelliği tayin edilmiştir. Daha sonra tahribatlı ve tahribatsız bir takım deneyler ile numunelerin mekanik özellikleri belirlenmiştir. Tüm bu deneyler ve son olarak da malzeme kullanımı ve temini gibi durumlar göz önünde bulundurularak ekonomik, fiziksel ve mekanik özellikler karşılaştırılmış ve sonuçlar değerlendirilmiştir

The Fuzzy Logic Model for the Prediction of Marshall Stability of Lightweight Asphalt Concretes Fabricated using Expanded Clay Aggregate

In the study, predictability of Marshall Stability (MS) of light asphalt concrete that fabricated using expanded clay and had varied mix properties with Fuzzy Logic (FL) were researched. With this aim, asphalt concrete samples that added expanded clay aggregate (EC) in accordance with gradation determined in Highway Technical Specification, had different percentage of bitumen (POB) (4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%) and unit weight (UW) (1,75–1,87 (gr/cm3)) were prepared and determined Marshall stabilities with Marshall tes

Beton yolların servis yeteneğinin ANFIS yöntemi ile tahmin edilmesi

In this study, an Adaptive Neuro-Fuzzy Inference System (ANFIS) model has been developed in order to predict Present Serviceability Ratio (PSR) which is one of the important parameter used in designing rigid pavements. In modeling Slope Variance (SV), Cracking (C) and Patching (P) were used as input parameters and PSR was used as output parameter ANFIS model compared with experimental (measured) parameters and determined that correlation was perfect between them. It was determined that can be able to use ANFIS model for predicting PSR used practically in designing rigid pavements depending on SV, C and P with low error rates within a short period of time without any experimental study and measurement

Diagnostic delay in psoriatic arthritis: insights from a nationwide multicenter study

This study aimed to investigate the duration of diagnostic delay in patients with psoriatic arthritis (PsA) and identify potential contributing factors using a comprehensive, population-based approach. Data were obtained from the Turkish League Against Rheumatism (TLAR)-Network, involving patients who met the CASPAR criteria. Diagnostic delay was defined as time interval from symptom onset to PsA diagnosis, categorized as 2 years. Temporal trends were assessed by grouping patients based on the year of diagnosis. Various factors including demographics, clinical characteristics, disease activity, quality of life, physical function, disability, fatigue, and well-being were examined. Logistic regression models were used to identify factors associated with diagnostic delay. Among 1,134 PsA patients, mean diagnostic delay was 35.1 months (median: 12). Approximately 39.15% were diagnosed within 3 months, and 67.02% were diagnosed within 24 months. Patients experiencing longer delays had higher scores in Psoriatic Arthritis Quality of Life Questionnaire (PsAQoL), Functional Assessment of Chronic Illness Therapy-Fatigue (FACIT-Fatigue), Bath Ankylosing Spondylitis Disease Activity Index (BASDAI), patient's global assessment (PtGA) and physician's global assessment (PhGA). Diagnostic delay has decreased over time, with median delay falling from 60 to 24 months throughout pre-2010 and 2015-2019 terms. Several factors were identified as significant contributors to delayed diagnosis, including lower levels of education (OR = 2.63), arthritis symptoms preceding skin manifestations (OR = 1.72), low back pain at first visit (OR = 1.60), symptom onset age (OR = 0.96), and psoriasis subtype (OR = 0.25). Timely diagnosis of PsA is crucial for effective management and improved outcomes. Despite recent improvements, about one-third of PsA patients still experience delays exceeding 2 years. By identifying influential factors such as education level, arthritis symptoms preceding skin manifestations, initial visit symptoms, age of symptom onset, and psoriasis subtype, healthcare practitioners may create specific techniques to help in early detection and intervention

The impact of nail psoriasis on disease activity, quality of life, and clinical variables in patients with psoriatic arthritis: A cross-sectional multicenter study

Aim Nail involvement is common in psoriatic arthritis. This study assesses clinical characteristics, nail psoriasis prevalence, and impact of nail psoriasis on disease activity in patients with psoriatic arthritis (PsA). Method This cross-sectional multicenter study was conducted by the Turkish League Against Rheumatism using PsA patients recruited from 25 centers. Demographic and clinical characteristics of PsA patients, such as disease activity measures, quality of life, and nail involvement findings were assessed during routine follow-up examinations. Patients were divided into two groups according to the presence or absence of nail psoriasis and compared using the chi(2) test or Fisher exact test for categorical variables and the t-test or Mann-Whitney U test for continuous variables. Results In 1122 individuals with PsA, 645 (57.5%) displayed nail psoriasis. The most frequent features of fingernails were ridges (38%), followed by pitting (21%) and onycholysis (19%). More females were present in both groups (with and without nail psoriasis; 64% vs 67%, P < 0.282). Patients with nail psoriasis were older, indicated more pain and fatigue, experienced greater swelling, tender joint counts, and skin disease severity, and had a higher disease activity score compared with those without nail psoriasis (all P < 0.05). Conclusion We demonstrate an increased prevalence of nail psoriasis observed in patients with psoriatic arthritis. Patients with nail involvement experience increased disease activity, lower quality of life, and diminished mental and physical status compared with those without nail involvement

Beyond expectations: disease duration and psychological burden in psoriatic arthritis

This study aims to investigate the relationship between disease duration and psychological burden in PsA and to identify the risk factors associated with psychological distress. Patients with PsA who met CASPAR classification criteria enrolled by Turkish League Against Rheumatism (TLAR)-Network. Patients were categorized into three groups based on disease duration: early stage (< 5 years), middle stage (& GE; 5, < 10 years), and late stage (& GE; 10 years). All patients underwent clinical and laboratory assessment using standardized protocol and case report forms. The associations between psychological variables and clinical parameters were assessed by a multivariate analysis. Of the 1113 patients with PsA (63.9% female), 564 (%50.7) had high risk for depression and 263 (%23.6) for anxiety. The risk of psychological burden was similar across all PsA groups, and patients with a higher risk of depression and anxiety also experienced greater disease activity, poorer quality of life, and physical disability. Multivariate logistic regression revealed that female gender (OR = 1.52), PsAQoL (OR = 1.13), HAQ (OR = 1.99), FiRST score (OR = 1.14), unemployment/retired (OR = 1.48) and PASI head score (OR = 1.41) were factors that influenced the risk of depression, whereas the current or past enthesitis (OR = 1.45), PsAQoL (OR = 1.19), and FiRST score (OR = 1.26) were factors that influenced the risk of anxiety. PsA patients can experience a comparable level of psychological burden throughout the course of their disease. Several socio-demographic and disease-related factors may contribute to mental disorders in PsA. In the present era of personalized treatment for PsA, evaluating psychiatric distress can guide tailored interventions that improve overall well-being and reduce disease burden