5916 research outputs found
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How much do we know about the microplastic distribution in the mediterranean sea: A comprehensive review
No full textThe Mediterranean Sea is one of the most heavily polluted regions. Here we comprehensively review the current state of microplastic pollution in the Mediterranean Sea and the Black Sea. A total of 284 studies published between 2012 and 2023 were analyzed, revealing a continuous increase in research efforts. Our review encompassed microplastic monitoring studies across five environmental matrices: the sea surface, water column, intertidal sediment, bottom sediment, and biota, with a predominant focus observed in biota-related studies with fish, molluscs, crustaceans, and echinoderms being the primary focus. The study found that species such as Mullus barbatus, Mytilus galloprovincialis, Nephrops norvegicus, and Holothuria tubulosa are frequently studied species. The review also emphasizes the lack of standardized methodologies across studies, which hampers the comparability of results and the synthesis of data. The findings of this study provide a critical evaluation of the current research landscape and identify significant knowledge gaps, particularly in the underrepresented southern Mediterranean and Black Sea regions, calling for more balanced research efforts and methodological consistency in future studies.Cukurova Universit
Field observations for industrial buildings after 2023 Kahramanmaras earthquakes
No full textOn February 6(th), 2023, East Anatolian Fault system in Turkiye caused a severe earthquake sequence with moment magnitudes (Mw) of 7.7 and 7.6 at the epicenter of Kahramanmaras, affecting 11 provinces and a significant portion of Turkey's industrial community. A reconnaissance team was assembled in the days following the earthquake sequence to visit the industrial districts in the five provinces of the affected area: Adana, Osmaniye, Kahramanmaras, Gaziantep, Iskenderun, and Hatay. While the performance and functionality of 131 industrial buildings (59 precast reinforced concrete buildings) were inspected using the proposed datacollection protocols, several semi-structured interviews with industrial representatives were conducted to gather information on industrial buildings' damage and functionality states. The inspections and interviews established that the earthquake sequence had a severe impact on industrial buildings, resulting in substantial financial losses and long-term business interruptions. Precast concrete industrial buildings built before 2000 were found to be particularly vulnerable. The connection failures between columns and beams were the most widespread damage cause. Empirical fragility curves connecting seismic demands to the performance (structural and nonstructural) and functionality states of the inspected precast reinforced concrete industrial buildings were derived based on the post-earthquake damage data collected during the reconnaissance mission. The field observations and proposed fragility models will be a step towards resilient industrial buildings in Turkiye
Üç boyutlu sonlu eleman analiz yöntemi ile kohesif şevlere yakın konumlanmış temellerin sismik yük taşıma kapasitesine temel şeklinin etkisi.
No full textThis thesis focuses on assessing the impact of different footing shapes on the undrained seismic bearing capacity of surficial foundations located near slopes. The study employs the PLAXIS 3D finite element software to conduct a comparative analysis, aiming to provide valuable insights for geotechnical engineers involved in foundation design in such scenarios. For this purpose, numerical models are created to simulate the behaviour of surficial foundations under seismic loading. Various footing shapes are examined during the analysis, considering the undrained soil properties, slope characteristics, distance between the slope and footing, and seismic loading parameters. The research findings highlight the substantial influence of footing shape on the undrained seismic bearing capacity of surficial foundations near slopes. As a result of the study, design charts specific to each footing shape are developed, offering engineers a tool to estimate the bearing capacity in similar scenarios. These design charts provide practical guidance for optimal foundation design and enhance the understanding of how footing shape impacts the seismic performance of surficial foundations near slopes.Bu makale, şevlerin yakınında bulunan yüzeysel temellerin drenajsız sismik taşıma kapasitesi üzerindeki farklı temel şekillerinin etkisinin değerlendirilmesine odaklanmaktadır. Çalışma, karşılaştırmalı bir analiz yapmak için PLAXIS 3D sonlu elemanlar yazılımını kullanır ve bu tür senaryolarda temel tasarımında yer alan jeoteknik mühendisleri için değerli bilgiler sağlamayı amaçlar. Bu amaçla, yüzeysel temellerin sismik yükleme altındaki davranışını simüle etmek için sayısal modeller oluşturulmuştur. Drenajsız zemin özellikleri, şev özellikleri, şev ve temel arasındaki mesafe ve sismik yükleme parametreleri dikkate alınarak çeşitli temel şekilleri analiz sırasında incelenir. Araştırma bulguları, temel şeklinin, şevlerin yakınındaki yüzey temellerin drenajsız sismik taşıma kapasitesi üzerindeki önemli etkisini vurgulamaktadır. Çalışma sonucunda, her bir temel şekline özel tasarım çizelgeleri geliştirilerek, mühendislere benzer senaryolarda taşıma gücünü tahmin etme aracı sunulmaktadır. Bu tasarım çizelgeleri, optimum temel tasarımı için pratik rehberlik sağlar ve temel şeklinin şevlerin yakınındaki yüzeysel temellerin sismik performansını nasıl etkilediğinin anlaşılmasını geliştirir
The roles of mother-perceived coparenting and child routines on children's social-emotional competence during the COVID-19 pandemic
No full textThe purpose of the current study was to examine the contributions of coparenting quality and child routines to children’s social–emotional competence during COVID-19. Further, we investigated the indirect effects of coparenting quality on children’s social–emotional competence via child routines. The participants were 403 mothers of children between 23 and 102 months old (M = 59.23, SD = 10.92). Mothers reported their children’s social–emotional competence, coparenting quality, and children’s routines as main variables and the COVID-19 pandemic effects (financial, resources, psychological, and within-family interaction effects). Results from the structural equation model showed that higher levels of coparenting quality and consistency in child routines were positively related to children’s social–emotional competence. In addition, there was an indirect effect of coparenting on children’s social–emotional competence through child routines. In detail, higher parental coparenting quality was associated with more consistent child routines, and, in turn, more consistent child routines were associated with higher levels of social–emotional competence. These findings suggest that coparenting and child routines may play a crucial role in children’s social–emotional competence. Results are discussed, considering their functioning during the COVID-19 pandemic.TÜBİTAKPublisher versio
Decoding emotional dynamics: A comparative analysis of contextual and non-contextual models in sentiment analysis of turkish couple dialogues
No full textThis paper introduces the "Couple Dialogue" dataset, specifically curated for conversational sentiment analysis in the Turkish language. It comprises 14,294 utterances from 118 dyadic conversations between couples, each annotated to capture sentiment transitions and interpersonal dynamics. Our study contrasts two distinct modeling frameworks-the Non-Contextual Model and the Contextual Model. The Non-Contextual Model analyzes utterances independently, typically overlooking the nuances of conversational dynamics and sentiment evolution. Within this framework, we conducted a detailed morphological analysis due to the agglutinative nature and rich morphological structure of the Turkish language, which included various word forms and negation morphemes crucial for sentiment representation. In contrast, the Contextual Model employs state-of-the-art Large Language Models (LLMs) such as BERT, GPT-3.5 Turbo, Llama 2, and GPT-4, alongside architectures like DialogueRNN. This model processes the sequential and relational aspects of dialogues through three approaches: prompt-based, fine-tuned, and embedding-based methods, particularly enhanced with fine-tuning and advanced embedding techniques (utilizing pre-trained and fine-tuned Turkish BERT). The Contextual Model substantially outperforms the Non-Contextual Model, showing a 9.98% improvement in Weighted F1 scores validated by statistical tests. Our work not only pioneers the use of LLMs in Turkish conversational sentiment analysis but also underscores the critical importance of contextual understanding in capturing complex emotional cues in couple interactions. This study sets a robust benchmark for future explorations into sentiment analysis within linguistically rich contexts.TÜBİTAKPublisher versio
One anthropologist, two religious revivals: Lloyd A. Fallers and his theologically engaged anthropology on Turkish Islam in the 1960s
No full textLloyd A. "Tom" Fallers was an anthropologist at The University of Chicago known for his political and legal ethnography of East Africa in the 1950s. Because of his very early death, however, his senior research on Turkey in the 1960s and his late interest in comparative religion have largely been left buried in the archives. This article reconstructs Fallers's decade-long preoccupation with Turkish Islam, situating it within the context of postwar religious revivalism in the US and Turkey. In addition to shedding light on an unknown endeavor in the history of anthropology, it argues that Fallers's work on comparative religion contributes to contemporary discussions about how to do an ethnography of everyday religion while engaging with theology on a theoretical ground.Publisher versio
Stability of periodic waves for the defocusing fractional cubic nonlinear Schrödinger equation
No full textIn this paper, we determine the spectral instability of periodic odd waves for the defocusing fractional cubic nonlinear Schr & otilde;dinger equation. Our approach is based on periodic perturbations that have the same period as the standing wave solution, and we construct real periodic waves by minimizing a suitable constrained problem. The odd solution generates three negative simple eigenvalues for the associated linearized operator, and we obtain all this spectral information by using tools related to the oscillation theorem for fractional Hill operators. Newton's iteration method is presented to generate the odd periodic standing wave solutions and numerical results have been used to apply the spectral stability theory via Krein signature as established in Kapitula et al. (2004) and Kapitula et al. (2005).Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ
Optimization of hybrid microwave curing approach based on the performance of metakaolin-based geopolymer mortars
No full textGeopolymer binders have been highlighted due to their low carbon emission during production and processing. While metakaolin and F-type fly ash are commonly used as raw materials for aluminosilicate-based geopolymers, the long heat-curing requirements for hardening and strength development still pose challenges. This paper investigates the possible use of a hybrid microwave curing technique to design a set-on-demand approach to reduce the duration of heat curing in metakaolin-based geopolymer. The experimental design was established for samples with three different molar ratios (MR; 1.3,1.5, and 1.7) containing metakaolin, fly ash, and silica fume. Samples were subjected to 3 different curing regimes: oven curing, microwave (MW) curing, and hybrid curing (a combination of optimized microwave and oven curing). The performance evaluation was based on compressive strength, dimensional stability, and alkali leaching (efflorescence). Implementing only MW curing resulted in a significant decrease in compressive strength compared to their counterpart oven-cured samples. The reduction of compressive strength was more pronounced at lower molar ratios. The design of a hybrid curing approach where a portion of oven curing was replaced by MW resulted in a higher strength development than those only cured with MW. Similarly, the efficiency of hybrid curing was more pronounced in samples having MR of 1.5 and 1.7. Using MW curing in the geopolymer binders did not affect the alkali leaching; however, it increased the material's drying shrinkage. Results showed that replacing a portion of oven curing with microwave curing in a hybrid approach can increase the operation speed and the hardening rate without significantly decreasing compressive strength.Publisher versio
Yaşamın kıyısında türler arası eşiktelik: Hanım’da (1989) insan-hayvan yoldaşlığı
No full textThis article argues for liminality as a mutual, interspecies experience as well as a constituent of human-companion animal bond. Despite its potential for animal scholarship, research on interspecies liminality remain rather scarce. Drawing upon this research gap, the main objective of this study is to explore the experiences of liminality of human and feline protagonists in Halit Refiğ’s film Madame [Hanım] (1989) through its analysis conducted in adherence with the coding principles of Grounded Theory. Experiences of liminality of the human and feline protagonists in the film are closely related to the status passages of the characters’ lives. While the film narrates human liminality between living and dying at the end of Olcay’s life, the feline character Hanım depicts liminality of the animal subject between person and property as well as spatial (non)belonging thereof due to her human companion Olcay’s dying. Findings of the study indicate that, in addition to the category of liminal animals being a descriptor for animal populations in proximity to human settlements, liminality lens could be employed to understand life trajectories of individual animals, and to disclose potentialities for interspecies companionship and mutual survival in human-animal borderlands.Bu makale, eşikteliği türler arası müşterek bir deneyim ve insan-hayvan bağının kurucu bir unsuru olarak ele almaktadır. Hayvan çalışmaları için barındırdığı potansiyele rağmen, türler arası eşiktelik üzerine yapılmış araştırmalar görece azdır. Bu çalışmanın amacı alanyazındaki bu eksiklikten hareketle Halit Refiğ’in Hanım [Madame] (1989) filmindeki insan ve kedi kahramanların eşiktelik deneyimlerini, temellendirilmiş kuramın kodlama ilkelerini benimseyen incelemesi aracılığıyla araştırmaktır. Filmdeki insan ve kedi baş karakterlerin eşiktelik deneyimleri bu karakterlerin yaşamlarındaki geçişlerle yakından ilişkilidir. Film, Olcay karakteri üzerinden yaşam ve ölüm arasındaki eşiği temsil ederken, Hanım karakteri ile hayvan öznenin kişi-nesne arasındaki belirsiz ve akışkan konumunu ve bununla ilişkili mekânsal aidiyetsizliği resmeder. Araştırma bulguları, eşiktelik yaklaşımının liminal hayvan yerleşimciler gibi hayvan popülasyonlarını tanımlamaya ek olarak, tekil hayvanların yaşamlarını anlamak ve türler arası yoldaşlık ve birlikte hayatta kalma potansiyellerini açığa çıkarmak için kullanılabileceğine işaret etmektedir.Publisher versio
