38 research outputs found
Treatment of Fagus orientalis Surface by ZnO/TiO2/FAS-17- Based Nanoparticles
No full textAim of study: In this research, the surface ofFagus orientalis (beechwood) was chosen as a substrate due to its widely used strong biostructure in the wood industry. It was functionalized with ZnO, TiO2, and FAS-17 nanoparticles to enhance its service life.Material and methods: FAS-17 (Trimethoxysilane) and ammonium hexafluorotitanate were purchased from Sigma-Aldrich, and zinc borate from Etimine S.A. Methanol, ethyl alcohol, hydrochloric acid, sodium hydroxide, and zinc oxide were provided by TEKKIM. Characterization methods included FTIR, TG/DTA, XRD, SEM, and EDX. Hydrophobicity was determined by water contact angle using KSV Cam101. UV-Vis analysis used a Shimadzu UV-160 spectrophotometer, surface roughness was measured with a Marsurf M 300 device (ISO 4287), and color analysis was performed with a Datacolor Elrepho 450 X spectrometer (ASTM 2021).Main results: The thermal stability of wood was significantly improved through the hydrothermal deposition of ZnO/TiO2 nanoparticles. Additionally, hydrophobization was achieved using Triethoxy-1H,1H,1H,2H,2H,2H-perfluorodecylsilane (C14H19F13O3Si), referred to as FAS-17.Research highlights: The study demonstrated that the introduction of ZnO/TiO2 nanoparticles improved the thermal stability of wood. Furthermore, the use of FAS-17 resulted in effective hydrophobization. The thermal stability of wood was improved with ZnO/TiO2 nanoparticles. In addition, hydrophobization was supplied by FAS-17.Kahramanmaras Sutcu Imam University, Scientific Research Projects Coordination Department [2018/3-20 D]This study has received support from Kahramanmaras Sutcu Imam University, Scientific Research Projects Coordination Department, under the project number 2018/3-20 D. We acknowledge their financial support in conducting this research
Identifying the time of a step change with multivariate single control charts
No full textDOGU, ERALP/0000-0002-8256-7304WOS: 000349904400003Change point estimation procedures simplify the efforts to search for and identify special causes in multivariate statistical process monitoring. After a signal is generated by the simultaneously used control charts or a single control chart, add-on change point procedure estimates the time of the change. In this study, multivariate joint change point estimation performance for simultaneous monitoring of both location and dispersion is compared under the assumption that various single charts are used to monitor the process. The change detection performance for several structural changes for the mean vector and covariance matrix is also discussed. It is concluded that choice of the control chart to obtain a signal may affect the change point detection performance.Scientific and Technological Research Council of Turkey (TUBITAK)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK)Dogu's research was partially funded by the grants from the graduate scholarship program of the Scientific and Technological Research Council of Turkey (TUBITAK). The author thanks the editor, the associate editor, and the referee for careful reading and for their comments which greatly improved the paper. The author also thanks Dr Ipek Deveci Kocakoc for her support and guidance throughout the researc
Innovative Surface Improvement of GFRC Using Hydrothermally Produced Ch-TiO2-CuO Nanohybrid Composite Additives
No full textThis study examines the impact of the Ch-TiO2-CuO nanohybrid composite on the surface properties and antimicrobial effects of Glass fiber-reinforced concrete (GFRC) panels. GFRC panels are known for their durability and aesthetic compatibility, making them suitable for exterior facades and historic restoration work. However, their porosity and hydrophilic nature make them susceptible to microbial colonization, affecting their durability and visual appeal. To address this, antimicrobial nanohybrid crystals (Ch-TiO2-CuO) were developed using a hydrothermal method and incorporated into GFRC panels. This integration offers significant advantages, including reduced maintenance, long-term structural integrity, and preserved aesthetic properties. Additionally, this approach aligns with sustainability goals by enhancing the environmental friendliness of GFRC over its lifetime. The study concludes that incorporating antimicrobial agents into GFRC production supports smart city initiatives by providing long-term protection against microbial degradation while maintaining aesthetic standards, thus contributing to cleaner, safer urban environments.TUBITAK [122C050, TBI bullTAK-2218]Fibrobeton Inc.This study was supported by TUBI center dot TAK-2218 Postdoctoral Fellow-ship Project ID: 122C050 and by Fibrobeton Inc., which provided both financial and technical resources
HPC Based Acceleration for Optimization of Predictive Models: Lithography Overlay Performance Modeling
No full textThis thesis project achieves designing and comparing two parallel implementations for exhaustive grid search along a large model space to find the optimum mapping model for overlay predictions used in ASML lithography machines. The search algorithm leads to an effectively intractable problem as long as sequential implementation is concerned, but a parallel implementation using the technologies pro-vided by ASML High Performance Cluster (HPC) pave the way to tackle the challenge. A number of parallel execu-tion concepts have been developed using different frame-works that are exposed to the ASML HPC developer com-munity by the platform maintainers. Among these con-cepts, the most promising ones with respect to a defined set of criteria have been chosen to carry on with the implemen-tation effort. It has been shown that a PBS based Lab im-plementation can scale on HPC with a parallel efficiency of 66%, with most of the efficiency loss stemming from scheduler overhead. A second, Spark based Fab implementa-tion has an increased efficiency of 82%, paving a way for speedup of almost 1700x for a Spark cluster with 2048cores. Moreover, It has been shown experimentally that perfor-mance scales linearly over the model space dimensions. Baseline sequential implementation is estimated to take, by extrapolation, 2590 hours to execute on a single core for a typical model space use case. Refactoring the sequential implementation to utilize multiple CPU cores through mul-tiprocessing can drive execution down to 115 hours on a 24-core machine. Fab parallel implementation executes the same use case in 1.6 hours, enabling exploratory and itera-tive approaches to modeling for data scientists and domain experts.Computer Engineerin
Anatomy, morphology, palynology and nutlet micromorphology of the rediscovered Turkish steno-endemic Stachys longiflora Boiss. and Bal. (Lamiaceae)
No full textStachys longiflora Boiss. & Bal, previously known only from the type gathering is a steno-endemic species from Turkey. The species was firstly collected by Balansa from Mersin-Guzeldere in 1855 and described by Boissier and Balansa in 1859. It was not collected again until 2011, when the author found it in Guzeldere (Mersin). Therefore, S. longiflora is treated under Data Deficient DD category in the Turkish Red Data Book. In this study, some anatomical and micromorphological characters, observations and measurements of S. longiflora are presented for the first time. The diagnostic morphological, anatomical, nutlet micromorphological and palynological characters of this steno-endemic species are discussed. Morphological characteristics of corollas, calyces, leaves, and stems are useful for specific delimitation in Stachys. Anatomical characters such as the shape of sclerenchymatic tissue and presence or absence of sclerenchymatic tissue in stems, mesophyll structures in leaves are of taxonomic significance. Moreover, the presence or absence of nutlets trichomes, shape and sculpturing pattern of nutlets are diagnostic characters. The emended and expanded description, ecology and phenology of this steno-endemic species are also presented along with its revised conservation status.Necmettin Erbakan University Scientific Research Projects Coordination Unit [131210001]The author is grateful to the curators of ANK, AEF, B, BM, E, G, GAZI, H, HUB, ISTE, ISTF, K and KNYA for permission to access their collections. I thank Dr. Muhittin Dinc for his support during the fieldwork. I am also grateful to both anonymous reviewers for their careful review of the manuscript. The author would like to thank the Necmettin Erbakan University Scientific Research Projects Coordination Unit under Grant No. 131210001 for the financial support
Unveiling the actual progress of Digital Building Permit: Getting awareness through a critical state of the art review
No full textGrowing interest is awarded to the digitalization of the building permitting use case and many works are developed about the topic. However, the subject is very complex and many aspects are usually tackled separately, making it very hard for traditional literature reviews to grasp the actual progress in the overall topic. This paper unveils the detailed state of the art in Digital Building Permitting (DBP) by critically analysing the literature by means of a set of coding tags (research progress, implementation, affected DBP workflow steps, ambitions addressed) assigned by a multidisciplinary team. The executed research shows that the mainly addressed aspects of the digitalization of building permit process are the technologies to check the compliance of design proposals against regulations, followed by the digitalization of regulations. Improvable aspects identified in the entire building permit system are instead e.g. the involvement of officers, scalability of solutions and interoperability of data, intended both as data validation and as integration of geospatial data with building models.Urban Data Scienc
Multifunctional GFRC composites: PEDOT: PSS-driven dielectric enhancement for energy storage and sensing applications
No full textThis study presents a comprehensive investigation into the development and characterization of multifunctional Glass Fiber Reinforced Cement (GFRC) composites enhanced with Poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT: PSS) to impart advanced electrical properties. We systematically analyzed the influence of PEDOT: PSS concentration (0-15 wt %) and curing age on the dielectric behavior of these novel composites, evaluating their capacitance, dielectric constant, loss factor, and electrical modulus across a broad frequency range (10 Hz-10 MHz). The integration of PEDOT: PSS significantly modified the material's electrical characteristics, demonstrating concentration-dependent variations and complex relaxation mechanisms dominated by Maxwell-Wagner interfacial polarization. The optimized P2 formulation (10 wt % PEDOT: PSS) exhibited superior electrochemical performance, maintaining the highest capacitance values and achieving a peak dissipation factor (tan delta) of 0.43 +/- 0.02 at day 15, representing a 185 % enhancement over unmodified GFRC. EDX analysis confirmed successful polymer incorporation, with P2 exhibiting the highest carbon content (5.8 wt %) and sulfur content (1.8 wt %), indicating optimal dispersion. Equivalent circuit models were established and validated (R2 > 0.98), providing insights into complex charge transport mechanisms within this hybrid material. Microstructural analyses via scanning electron microscopy revealed significant morphological modifications, including the formation of crystalline and plate-like structures, while complementary FT-IR and TGA analyses confirmed polymer-cement interaction stability and thermal stability up to 450 degrees C. These findings establish fundamental design principles for creating electrically conductive cementitious materials with tunable dielectric properties, enabling strategic deployment in innovative infrastructure systems, energy storage devices, and electromagnetic shielding technologies
Engineering properties of hybrid polymer composites produced with different unsaturated polyesters and hybrid epoxy
No full textIn this study, the mechanical properties of hybrid polymer composites produced with different unsaturated polyesters and hybrid epoxy resins are investigated. The composites were produced by blending unsaturated polyester resins (i.e., orthophthalic, isophthalic, and terephthalic) and bisphenol-A-based epoxy-vinyl ester resin to produce single, binary and ternary blends. In doing this, a total of 14 different combinations were produced. The results show that the binary and ternary polymer blends tend to improve almost all the tested properties of the polymer composites. Further, the fourier-transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM) results confirmed that the reason for enahcned properties is due to better crosslinking and longer chains of polymers produced in binary and ternary mixtures. The absence of peaks determining the styrene polymerization character for all mixtures also demonstrates that the polymerization reaction takes place in all mixtures. It is also believed that the binary and ternary resin mixtures have developed higher energy absorption compared to single resin composites. All of the mentioned has been achieved while the gelation temperatures of the hybrid resin mixtures were not changed significantly and they began gelation at the expected temperature values. In addition to the gelation, peak exotherm temperatures, and barcol hardness values demonstrated that all mixtures achieved sufficient curing. The result of this study is significant and point to the great potential of producing high performance polymer composites through the use of binary or ternary resin mixtures.The authors appreciate all the universities that supported this study
The intercultural dialogue in religious context in Juan Goytisolo's ''Quarantine'' novel
No full textURL:http://sefad.selcuk.edu.tr/sefad/article/view/129Juan Goytisolo Çagdas spanyol Edebiyatı’nın en önemli yazarlarından birisidir. Yazar sadece içinde yetistigi Batı kültürünü degil, Dogu dünyasını da çok iyi bilmekte ve romanlarında her iki kültürün unsurlarını kullanmaktadır. Bu bakıs açısından hareketle burada yayımlanan makalenin temel amacı yazarın Kırk Günlük Süre adlı romanında Hıristiyanlık ve Müslümanlık unsurlarını ele alarak Batı ve Dogu kültürlerini incelemektir. spanya ç Savası’ndan (1936-1939) kısa bir süre önce 1931 yılında Barselona’da dogan Goytisolo, iç savas sırasında çocuklugunu yasamıs, talihsiz 30’lar kusagı yazarlarındandır. Yazar iç savas sonrası baslayan General Franco’nun Hıristiyanlıktan baska dinlere ve kültürlere karsı katı ve hosgörüsüz olan diktatörlügü döneminde gençlik yıllarını geçirmis ve bu nedenle 1956 yılında kesin olarak Paris’e yerlesmistir. Burada yazar buldugu özgürlük ortamıyla farklı din ve kültürlerle de ilgilenmeye baslamıstır. Dogu kültürü ile tanısması Cezayir olayları nedeniyle olmustur. Cezayir bagımsızlık savası sırasında Fransız hükümetinin ve aydınlarının gösterdikleri davranıslardan dolayı yazar hayal kırıklıgına ugramıstır. Fransa’da yasayan birçok Afrika kökenli kisinin polis tarafından tutuklanması yazarın Avrupa’ya ve içinde bulundugu kültüre karsı bakıs açısının degismesine ve Dogu felsefesini ve kültürünü incelemesine neden olmustur. slamiyet’in Batı dünyasında yanlıs anlasıldıgını düsünen Goytisolo slam kültürü ilgili birçok yazı yazmıs ve romanlarında sadece Hıristiyanlık ögelerini degil slam kültürünün unsurlarını da kullanmıstır. Her iki kültürü birlikte kullandıgı yapıtlarından birisi de 1991 yılında yayımlanan Kırk Günlük Süre’dir. Dante’nin Hıristiyan dünyası için en önemli eserlerden biri olan 0lahi Komedya’dan etkilenen yazar eserinde slâmiyet’te yer alan berzah âlemini anlatmaktadır. Roman bir baska yönden bakıldıgında politik unsurları da barındırmaktadır. Güncel konuları yakından takip eden ve bu konuları romanlarında kullanan yazar romanın yazıldıgı dönemde meydana gelen Körfez Savası’na din olgusu çerçevesinde deginmis ve bu savasın sonuçlarına da kitabında yer vermistir. Bu baglamda yazar Batı dünyasının bu savas üzerindeki etkilerini de ortaya koymus ve Batı’nın Dogu cografyasına yaptıgı siyasi müdahaleyi elestirmistir.Juan Goytisolo is one of the most important authors of Spanish contemporary literature. The author does not know very well only the elements of Western culture but also Eastern world and he uses in his novels the elements of both cultures. Based on this, the main purpose of this essay that published is to study Eastern and Western cultures in Quarantine novel by the way of the Christian and Islamic elements. Born in Barcelona before a short time of the Civil War (1936-1939), Goytisolo is one of the authors of unlucky generation of the 30s, spending their childhood in times of the Civil War. He passed his youth in the period of the religious and cultural intolerance of the dictatorship of General Franco, starting after the Civil War and for this reason settled definitely in Paris. In Paris, the author started to get interested in different religions and cultures due to the atmosphere of freedom. The events in Algeria caused him to get to know the Eastern culture. Through the Algerian War of Independence the author got disappointed because of the behavior of the French government and intellectuals. The detention of many Africans by the police in France led to a change of the perspective of the writer about Europe and its culture caused the author to search about the Eastern philosophy and culture. Believing in the misunderstanding of Islam in the Western world, Goytisolo has written a lot of works in relation to the Islamic culture. He includes in his novels the elements of Christianity as well as the features of Islamic culture. One of these books in which he uses both cultures is the Quarantine novel published in 1991. The author impressed by Divine Comedy, which is one of the most important books for the Christian world, describes in the novel barzakh exiting in Islamic eschatology. Goytisolo succeeds in combining Western and Eastern cultures in the same book in this way. Seen from another perspective, the novel also holds political issues. The author who follows the global issues and uses them in his novels, mentions the Gulf War and the results of this war, happening at the time of writing the novel. In this context, the writer divulges the effects of the Western world on this war and criticizes its political intervention on the Eastern geography
Diffusion MRI GAN synthesizing fibre orientation distribution data using generative adversarial networks
No full textPublisher Copyright: © The Author(s) 2025.Machine learning may enhance clinical data analysis but requires large amounts of training data, which are scarce for rare pathologies. While generative neural network models can create realistic synthetic data such as 3D MRI volumes and, thus, augment training datasets, the generation of complex data remains challenging. Fibre orientation distributions (FODs) represent one such complex data type, modelling diffusion as spherical harmonics with stored weights as multiple three-dimensional volumes. We successfully trained an α-WGAN combining a generative adversarial network and a variational autoencoder to generate synthetic FODs, using the Human Connectome Project (HCP) data. Our resulting synthetic FODs produce anatomically accurate fibre bundles and connectomes, with properties matching those from our validation dataset. Our approach extends beyond FODs and could be adapted for generating various types of complex medical imaging data, particularly valuable for augmenting limited clinical datasets.Peer reviewe
