106 results on '"YILDIRIM, İREM"'
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102. Chemical,Mineralogical, and Morphological Properties of Steel Slag.
- Author
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Yildirim, Irem Zeynep and Prezzi, Monica
- Subjects
SLAG ,STEEL ,STEEL minimills ,X-ray diffraction ,MAGNESIUM oxide - Abstract
Steel slag is a byproduct of the steelmaking and steel refining processes. This paper provides an overview of the different types of steel slag that are generated from basic-oxygen-furnace (BOF) steelmaking, electric-arc-furnace (EAF) steelmaking, and ladle-furnace steel refining processes. The mineralogical and morphological properties of BOF and electric-arc-furnace-ladle [EAF(L)] slag samples generated from two steel plants in Indiana were determined through X-Ray Diffraction (XRD) analyses and Scanning Electron Microscopy (SEM) studies. The XRD patterns of both BOF and EAF(L) slag samples were very complex, with several overlapping peaks resulting from the many minerals present in these samples. The XRD analyses indicated the presence of free MgO and CaO in both the BOF and EAF(L) slag samples. SEM micrographs showed that the majority of the sand-size steel slag particles had subangular to angular shapes. Very rough surface textures with distinct crystal structures were observed on the sandsize particles of BOF and EAF(L) slag samples under SEM. The characteristics of the steel slag samples considered in this study are discussed in the context of a detailed review of steel slag properties. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
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103. Construction of an Embankment with a Fly and Bottom Ash Mixture: Field Performance Study.
- Author
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Sungmin Yoon, Balunaini, Umashankar, Yildirim, Irem Z., Prezzi, Monica, and Siddiki, Nayyar Z.
- Subjects
CONSTRUCTION ,STRUCTURAL engineering ,STRUCTURAL design ,EMBANKMENTS ,LANDFILLS ,EARTHWORK - Abstract
Fly ash and bottom ash are coal combustion by-products (CCBPs) that are generated in large quantities throughout the world. It is often economical to dispose ash as mixtures rather than separately; that notwithstanding, only a few studies have been performed to investigate the behavior of fly and bottom ash mixtures, particularly those with high contents of fly ash. Also, there is very limited data available in the literature on the field performance of structures constructed using ash mixtures. This paper describes the construction and the instrumentation of a demonstration embankment built with an ash mixture (60:40 by weight of fly ash:bottom ash) on State Road 641, Terre Haute, Ind. Monitoring of the demonstration embankment was conducted for a period of 1 year from the start of construction of the embankment. The settlement of the embankment stabilized approximately 5 months after the end of its construction. According to horizontal inclinometer readings, the differential settlement at the top of the embankment is about 5 mm. Results from field quality control tests performed during construction of the demonstration embankment and monitoring data from vertical and horizontal inclinometers and settlement plates indicate that the ash mixture investigated can be considered an acceptable embankment construction material. [ABSTRACT FROM AUTHOR]
- Published
- 2009
- Full Text
- View/download PDF
104. Paired glioblastoma cell cultures of the fluorescent bulk tumor and non-fluorescent tumor margin display differential phenotypes and cell states across patients
- Author
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Neves, Inês, Lu, Xi, Maturi, Nagaprathyusha, Dang, Yonglong, Latini, Francesco, Yildirim, Irem, Sundström, Anders, Bergström, Tobias, Jokinen, Veera, Xing, Pengwei, Jarvius, Malin, Larsson, Rolf, Fryknäs, Mårten, Ryttlefors, Mats, Chen, Xingqi, Swartling, Fredrik J., Uhrbom, Lene, Neves, Inês, Lu, Xi, Maturi, Nagaprathyusha, Dang, Yonglong, Latini, Francesco, Yildirim, Irem, Sundström, Anders, Bergström, Tobias, Jokinen, Veera, Xing, Pengwei, Jarvius, Malin, Larsson, Rolf, Fryknäs, Mårten, Ryttlefors, Mats, Chen, Xingqi, Swartling, Fredrik J., and Uhrbom, Lene
- Abstract
Glioblastoma is an aggressive and therapy-resistant primary brain tumor with a dismal prognosis. The inevitable recurrence is in almost all patients in contact with the resection cavity, suggesting the local peritumoral area as its origin. Glioblastoma cells of this region have seldom been studied and few authenticated models exist. We have explanted matched tissue samples from the bulk tumor and local tumor edge of 13 glioblastoma patients of which 7 were sustainable beyond passage 6. Each edge culture was more invasive and less self-renewing and tumorigenic compared to its paired bulk culture. Three pairs of edge and bulk cultures were profiled with a combined single nucleus (sn) RNA- and ATAC-sequencing. Transcriptome analysis displayed for all patients a shift towards AC-MES cell states in the edge cultures. Chromatin-accessibility profiles uncovered differential regulatory networks with edge cells being enriched for transcription factor (TF) motifs of invasion, neurons, and immune cells. We propose that edge cells have been epigenetically reprogrammed by their unique interactions with various cell types in the peritumoral region. The fact that glioblastoma edge cells display distinct epigenetic regulation compared to their bulk tumor cells has implications for therapy development that should be targeted to and tested on the relapse-causing glioblastoma edge cells.
105. How People Weave Online Information Into Pseudoknowledge
- Author
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Joshua Introne, Julia R. DeCook, Luca Iandoli, Irem Gokce Yildirim, Shaima Elzeini, Introne, Joshua, Gokce Yildirim, Irem, Iandoli, Luca, Decook, Julia, and Elzeini, Shaima
- Subjects
Cultural Studies ,business.industry ,Communication ,05 social sciences ,Internet privacy ,050801 communication & media studies ,Degree (music) ,050105 experimental psychology ,lcsh:P87-96 ,Computer Science Applications ,lcsh:Communication. Mass media ,0508 media and communications ,pseudoknowledge, narrative, fake news, online conversation ,0501 psychology and cognitive sciences ,Social media ,Narrative ,Fake news ,Misinformation ,business ,Psychology - Abstract
Misinformation has found a new natural habitat in the digital age. Thousands of forums, blogs, and alternative news sources amplify fake news and inaccurate information to such a degree that it impacts our collective intelligence. Researchers and policy makers are troubled by misinformation because it is presumed to energize or even carry false narratives that can motivate poor decision-making and dangerous behaviors. Yet, while a growing body of research has focused on how viral misinformation spreads, little work has examined how false narratives are in fact constructed. In this study, we move beyond contagion inspired approaches to examine how people construct a false narrative. We apply prior work in cognitive science on narrative understanding to illustrate how the narrative changes over time and in response to social dynamics, and examine how forum participants draw upon a diverse set of online sources to substantiate the narrative. We find that the narrative is based primarily on reinterpretations of conventional and scholarly sources, and then used to provide an alternate account of unfolding events. We conclude that the link between misinformation, conventional knowledge, and false narratives is more complex than is often presumed, and advocate for a more direct study of this relationship.
- Published
- 2018
106. The Collaborative Construction and Evolution of Pseudo-knowledge in Online Conversations(
- Author
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Joshua Introne, Luca Iandoli, Irem Gokce Yildirim, Shaima Elzeini, Julia R. DeCook, Introne, Joshua, Iandoli, Luca, Decook, Julia, Gokce Yildirim, Irem, and Elzeini, Shaima
- Subjects
business.industry ,05 social sciences ,Internet privacy ,Collective intelligence ,Face (sociological concept) ,050801 communication & media studies ,050109 social psychology ,Citizen journalism ,Argumentation theory ,0508 media and communications ,Misinformation, conspiracy theory, pseudoscience, narrative, knowledge construction, argumentation, collective intelligence, diffusion of information, online conversations ,0501 psychology and cognitive sciences ,The Internet ,Narrative ,Misinformation ,business ,Psychology ,Social psychology ,Storytelling - Abstract
Misinformation has found a new natural habitat in the digital age. Thousands of forums, blogs, and alternative news sources amplify inaccurate information to such a degree that it impacts our collective intelligence. Widespread misinformation is troubling, not just because it is wrong, but also because it can persist in the face of attempts to correct it, and thus becomes part of a larger culture of community-based pseudoknowledge (PK). Prior work has focused on the motivations and psychology of those who create and maintain PK but has neglected inspection of the dynamics of collective PK production itself. In this exploratory case study, we illustrate how the active participation of multiple collaborators adapts PK over time through a process we liken to participatory storytelling. We argue that the Internet provides a uniquely well-suited environment for evolving PK that is "more fit", in that it is more engaging, easier to defend, and possibly easier to spread.
- Published
- 2017
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