Anomalous single production of fourth generation t′t' quarks at ILC and CLIC

We present a detailed study of the anomalous single fourth generation $t'$ quark production within the dominant Standard Model(SM) decay modes at future $e^+e^-$ colliders. We calculate the signal and background cross sections in the mass range 300-800 GeV. We also discuss the limits of $t'q\gamma$ and $t'qZ$ ($q=u,c$) anomalous couplings as well as values of attainable integrated luminosity for 3$\sigma$ observation limit.Comment: 12 pages, 14 figures, version to be published on Nucl.Phys.

Mechanical and radiation attenuation properties of conventional and heavy concrete with diverse aggregate and water/cement ratios

Ovim istraživanjem predstavljaju se rezultati sveobuhvatnog laboratorijskog rada kojemu je cilj ispitati mehanička svojstva i svojstva smanjenja zračenja teških betona u kojima se kao agregat koristio pirit, krom i magnetit te betona normalne težine koji su se proizveli s tri različita vodocementna omjera (v/c = 0,4/0,5/0,6). U laboratoriju su provedena ispitivanja tlačne čvrstoće, brzine prolaska ultrazvuka, eksperimentalni modul elastičnosti te koeficijenta prigušenja mase tih betona. Na temelju provedenih ispitivanja utvrđeno je da betoni normalne težine i teški betoni imaju slično ponašanje u smislu tlačne čvrstoće i modula elastičnosti. U slučaju teških betona (njihovi v/c omjeri povećani su uslijed konstantne količine vode te smanjene količine cementa), gustoća se povećava zbog povećanja količine agregata veće gustoće u odnosu na cement u sastavu betona. To je razlog zašto teški betoni koji su proizvedeni s većim v/c omjerom te koji su manje čvrstoće mogu apsorbirati više rendgenskih zraka. Koeficijenti prigušenja mase konvergiraju pri visokim energetskim razinama kod teških i normalnih betona različitih gustoća.This paper presents the results of comprehensive laboratory work conducted for investigating the mechanical and radiation attenuation characteristics of heavyweight concrete produced with pyrite, chromium, and magnetite aggregates and normal weight concretes produced with three different water/ cement (w/c) ratios. Various experiments were conducted to determine the compressive strengths, ultrasound transmission velocities, experimental elasticity modules, and mass attenuation coefficients of these concretes. Heavy and normal weight concretes exhibited similar behaviour in terms of compressive strength and elasticity modules. In heavyweight concretes, with increased w/c ratios (by keeping the amount of water constant and decreasing the amount of cement), the corresponding density increased due to the increase in the amount of high-density aggregates rather than cement in the composition of concrete. Thus, heavyweight concretes produced with a high w/c ratio and low strength can absorb more X-rays. Mass attenuation coefficients converge in heavy and normal weight concretes with different densities at high energy levels

Unlocking energy efficiency: Experimental investigation of bamboo fibre reinforced briquettes as sustainable solution with enhanced thermal resistance

Energy consumption data reveals that buildings account for 40 % of overall energy usage. Without urgent intervention, this figure is poised to escalate alongside population growth, exacerbating the dependence on fossil fuels for energy production. Addressing this pressing issue demands effective measures to curtail energy consumption in buildings, a realm where research on bamboo's thermal performance still needs to be improved. This study fills a critical gap by investigating the integration of bamboo fibre in the briquettes, known for their high heat transfer coefficient (U-value). Leveraging the innovative coheating test method, the research pioneers an unexplored avenue to evaluate thermal performance. This novel approach distinguishes the study as a unique and original endeavour in the field. The findings demonstrate significant thermal enhancements by substituting bamboo fibre: 2 %, 4 %, and 6 % bamboo additions yield U-values of 4.698 W/m2K, 3.94 W/m2K, and 2.77 W/m2K, respectively. Notably, the 6 % bamboo-reinforced briquette showcases a remarkable 49.9 % improvement in thermal resistance compared to conventional counterparts. This study marks a pioneering effort towards achieving energy efficiency through sustainable materials in designing low/zero carbon buildings. By showcasing the potential of bamboo as a thermal insulator, the research illuminates a promising path for future construction practices. Embracing such innovations is paramount in mitigating the environmental impact and securing a sustainable future

Fostering corporate-startup collaboration in an open innovation environment

Taking into account the perspectives of both corporate and startup, it is evident that each side has their own set of strengths and weaknesses. The different characteristics of each party make bringing them together a challenging task. This research examined the collaboration examples in the literature, but the search for a complete model that considers all aspects with a holistic view remained unanswered. The main purpose of this research is to identify the various challenges and design comprehensive solutions for corporations without ignoring the needs and requirements of startups. This study addresses how can particular challenges seen in startup and corporate collaborations be overcome, what measures should be taken into account to accelerate open innovation and what factors should be considered when designing a framework for intellectual property rights and assisting a fair agreement. In light of the literature review focusing on open innovation and models of collaboration, structured interviews based on constructive research methodology were conducted with both selected corporate and different startup representatives. Analysis of the interviews indicates that finding the right partner is as important as eliminating deficiencies and weaknesses that provide the motivation for collaboration. The collaboration process is significantly influenced by various factors including innovation, intellectual property rights, legal agreements and sharing benefits. These perspectives play a crucial role in shaping overall collaboration. As a result of this study, a collaboration roadmap is designed for corporate consisting of three different phases: startup evaluation and funding, intellectual property rights management and common business model design. Even though the roadmap is shaped especially based on the specific challenges of the interviewed companies, it can be used with minor modifications, assuming that similar problems are seen to a large extent in the industry

The effect of capillarity on chloride transport and the prediction of the accumulation region of chloride in concretes with reinforcement corrosion

In this study, 20-year-old residential buildings which have reinforcement bar corrosion in their basement columns were investigated in Rize, Turkey. The reason for the occurrence of high steel corrosion in only some certain parts of the reinforcement of the columns in the basements was examined. The effect of concrete capillarity on chloride transport and reinforcement corrosion was analyzed. During the study process, the compressive strength, unit weight, sorption and absorption values of the concrete from core specimens taken from three buildings were measured and a loss in the diameters of corroded bars was detected. The chloride content of concrete columns and of the water entering the basements was calculated. It was identified that sea sand was used in the concrete of these buildings, and the buildings were affected by the water entering into the basements. It was expected that water with low chloride content entering the basements would decrease the amount of chloride content in the concrete with diffusion. However, it was observed that the amount of chloride content actually decreased at the parts of concrete which had direct contact with the low chloride content water while it increased at the capillary region. In fact, nearly three times more chloride than the chloride content used during the production of concrete was accumulated in some parts of the capillary region. The chloride accumulated in the capillary region of concrete when the slope of tangent (dh/dt) of capillary function (h(t)=k ?t), decreases below 0.08 × 10 -6. A correlation technique was proposed to predict the narrow region where chloride is accumulated in concrete. If the narrow width of chloride accumulation and reinforcement corrosion of the construction elements is known in advance, precautions can be taken against reinforcement corrosion by decreasing the amount of chloride content in this part of the concrete. © 2011 Elsevier Ltd. All rights reserved

Transition coefficients between compressive strengths of samples with different shape and size in mass concrete and use of weight maturity method in dam construction

WOS: 000530736700001Mass concrete (MC) is widely used in dam concretes due to their large aggregate grain diameters, low cement dosage, and low hydration temperatures. Monitoring of the hydration temperature and compressive strength is an important consideration during the casting of MC in the field. the purpose of this study is to determine the relationship between the compressive strengths of cylindrical specimens with different maximum aggregate grain diameters (D-max) and different dimensions in MCs used in dam construction and to investigate the usability of the weighted maturity method in determining the compressive strength of dam MC. in this study, the compressive strength transition coefficient (fck o15 x 30/fck o25 x 50) of the cylindrical samples with different dimensions in MC was found to be 1.135. It was found that the weight maturity method can be used to estimate concrete strength in dam MC with low hydration temperature

Comparing the pozzolanic activity properties of obsidian to those of fly ash and blast furnace slag

WOS: 000427218500027The use of pozzolan in cement provides economic advantages and improves the physico-mechanical properties of cement. Fly ash and blast furnace slag are widely used in cement as pozzolanic materials. in this study, obsidian known as volcanic glass which crops out in the lkizdere (Rize) region of NE Turkey was investigated as a pozzolana in cement. Mainly the pozzolanic activity, chemical and physico-mechanical properties of the obsidian cement were compared to the properties of the fly ash and blast furnace slag cement. According to laboratory test results, obsidian was seen to provide more positive effects compared to the properties of fly ash cement. It was concluded that obsidian was equivalent to blast furnace slag as a pozzolan. As a result, the obsidian located in the lkizdere region could be used as a pozzolana in cement. (C) 2017 Elsevier Ltd. All rights reserved.Scientific and Technological Research Council of Turkey (TUBITAK) - TurkeyTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [214M023]Authors would like to express their sincerest gratitude to the editor and reviewers. Thanks are due to the Academic Writing and Translation Office of RTE University for improving the language of the manuscript. the authors gratefully acknowledge the Scientific and Technological Research Council of Turkey (TUBITAK) - Turkey for funding this work through research project no: 214M023

The Fast Optimization of Digital Holography System

25th Signal Processing and Communications Applications Conference (SIU) -- MAY 15-18, 2017 -- Antalya, TURKEYWOS: 000413813100028In digital holography applications, the position of the object, which is in the system, substantially affects the quality and clarity of three dimensional reconstructed image obtained from hologram. Therefore, obtaining a good three dimensional image by locating the image to be reconstructed in the correct position in the system, can sometimes take a long time. The usage of artificial intelligence algorithms instead of capturing the best images by recording the image several times and reduction of this time would be wise. For the first time in this study by using the classification method approach used in artificial neural networks, which is an artificial intelligence methods, the best image is obtained with optimization via software, not on the digital holographic system. The three important features that affected the system, while the holographic setup is constructing, are examined for 142 different situations and the results of these situations are classified into 5 different classes. After classification by using artificial neural networks, the random values are taken for the test process of the trained system and the performance of the system is determined.Turk Telekom, Arcelik A S, Aselsan, ARGENIT, HAVELSAN, NETAS, Adresgezgini, IEEE Turkey Sect, AVCR Informat Technologies, Cisco, i2i Syst, Integrated Syst & Syst Design, ENOVAS, FiGES Engn, MS Spektral, Istanbul Teknik Uni

The Determination of Crack on Glass Surface by Optical Voice Detector Based on Digital Holography

1st International Conference on Optics, Photonics and Lasers (OPAL) -- MAY 09-11, 2018 -- Barcelona, SPAINWOS: 000454436200050This paper proposes a new application of digital holography to detect the crack on the surface of glass. A crack on the glass surface has been detected by recording the sound wave experimentally in digital holography. Firstly sound wave holograms are recorded by passing the sound wave through the smooth glass surface. After that sound holograms for the glass surface with crack are performed. The detection of crack on glass surface is determined by using their corresponding frequency spectrums for both situations.Int Frequency Sensor Assoc, Inst Phys, MDPI Journal Photonics, Springers Journal Lasers Mfg & Mat ProcDepartment of Scientific Research Projects in Bulent Ecevit UniversityBulent Ecevit University [2016-75737790-04]; Scientific and Technological Research Council of Turkey (TUBITAK)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [116E303]This study is supported by the Department of Scientific Research Projects in Bulent Ecevit University (project no: 2016-75737790-04) and the Scientific and Technological Research Council of Turkey (TUBITAK) (project no: 116E303)

IMAGE RECONSTRUCTION FROM PHASE HOLOGRAM OBTAINED BY USING SINGLE PHASE INFORMATION

22nd IEEE Signal Processing and Communications Applications Conference (SIU) -- APR 23-25, 2014 -- Karadeniz Teknik Univ, Trabzon, TURKEYWOS: 000356351400017In this study, it is aimed to obtain the real time image of the object, whose off-axis hologram recording is saved on CCD camera, from digital phase hologram. For creating the phase hologram, the phase information of the hologram recording on CCD camera is obtained. When the phase information is obtained, the Fourier transform algorithm and continuous wavelet transform methods are used. Finally, the using methods in this study are compared in terms of obtaining real time image having a high image quality and minimum power loss.IEEE, Karadeniz Tech Univ, Dept Comp Engn & Elect & Elect Eng