Browsing by Publisher "Academic Press Inc Elsevier Science"
Now showing items 1-11 of 11
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A short note on the geo-archeological significance of the ancient Theodosius harbour (Istanbul Turkey)
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Publisher and Date:(Academic Press Inc Elsevier Science, 2009)The sedimentary sequence discovered at archaeological excavations in ancient Theodosius Harbour at Istanbul contains the records of sea level environmental changes and the Cultural history of the region The cobbles at the base of the sequence include archaeological remnants of Neolithic Culture that settled in the at ea between 8.4 and 73 (14)C ka BP and are located at 6 m below the present sea level The sediments representing a coastal environment indicate that the area was used as a harbour from ...
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Calculating Level Densities of Heavy Nuclei by the Shell Model Monte Carlo Method
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Publisher and Date:(Academic Press Inc Elsevier Science, 2014)The microscopic calculation of nuclear level densities in the presence of correlations is a difficult many-body problem. The shell model Monte Carlo method provides a powerful technique to carry out such calculations using the framework of the configuration-interaction shell model in spaces that are many orders of magnitude larger than spaces that can be treated by conventional methods. We present recent applications of the method to the calculation of level densities and their collective enhancement ...
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Detecting structural changes using wavelets
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Publisher and Date:(Academic Press Inc Elsevier Science, 2015)We propose a powerful wavelet method to identify structural breaks in the mean of a process. If there is a structural change in the mean the sum of the squared scaling coefficients absorbs more variation leading to unequal weights for the variances of the wavelet and scaling coefficients. We use this feature of wavelets to design a statistical test for changes in the mean of an independently distributed process. We establish the limiting null distribution of our test and demonstrate that our test ...
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Electrical and optical percolations of polystyrene latex-multiwalled carbon nanotube composites
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Publisher and Date:(Academic Press Inc Elsevier Science, 2010)Electrical conductivity and optical transmittance properties of polystyrene (PS)-multiwalled carbon nanotube (MWCNT) composite films were investigated. Composite films were prepared by mixing of various mass fractions of MWCNT in PS-water dispersions. After water evaporates powder composite films were annealed at 175 degrees C above the glass transition of PS for 20 min. Photon transmission and two point probe resistivity techniques were employed to determine the variations of the optical and the ...
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Exploiting heterogeneous parallelism with the Heterogeneous Programming Library
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Publisher and Date:(Academic Press Inc Elsevier Science, 2013)While recognition of the advantages of heterogeneous computing is steadily growing the issues of programmability and portability hinder its exploitation. The introduction of the OpenCL standard was a major step forward in that it provides code portability but its interface is even more complex than that of other approaches. In this paper we present the Heterogeneous Programming Library (HPL) which permits the development of heterogeneous applications addressing both portability and programmability ...
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Holocene coastal change in the ancient harbor of Yenikapi-Istanbul and its impact on cultural history
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Publisher and Date:(Academic Press Inc Elsevier Science, 2011)An extensive rescue excavation has been conducted in the ancient harbor of Istanbul (Yenikapi) by the Sea of Marmara revealing a depositional sequence displaying clear evidence of transgression and coastal progradation during the Holocene. The basal layer of this sequence lies at 6 m below the present sea level and contains remains of a Neolithic settlement known to have been present in the area indicating that the sea level at similar to 8-9 cal ka BP was lower than 6 m below present. Sea level ...
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How people can become persuaded by weak messages presented by credible communicators: Not all sleeper effects are created equal
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Publisher and Date:(Academic Press Inc Elsevier Science, 2017)The sleeper effect has been proposed to describe temporal changes in persuasion for messages associated with noncredible sources. The present research introduces a new kind of sleeper effect denoting increases in persuasion for weak messages associated with credible sources. This effect of the source was hypothesized to derive from attending to the message source rather than the message arguments and reconstructing delayed attitudes primarily on the basis of the source information. Findings from ...
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On channel estimation for spatial modulated systems over time-varying channels
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Publisher and Date:(Academic Press Inc Elsevier Science, 2015)Spatial Modulation (SM) has been proposed recently for multiple-input multiple-output (MIMO) systems to cope with the interchannel interference and to reduce the detection complexity as compared to the conventional MIMO systems. In SM system the data symbols are transmitted by a randomly selected active antenna of a MIMO transmitter to the receiver through a wireless channel. The information is carried both by the data symbol from any signal constellation such as M-ary phase shift keying (M-PSK) ...
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Secondhand smoke in waterpipe tobacco venues in Istanbul Moscow and Cairo
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Publisher and Date:(Academic Press Inc Elsevier Science, 2019)Objective: The prevalence of waterpipe tobacco smoking has risen in recent decades. Controlled studies suggest that waterpipe secondhand smoke (SHS) contains similar or greater quantities of toxicants than cigarette SHS which causes significant morbidity and mortality. Few studies have examined SHS from waterpipe tobacco in real-world settings. The purpose of this study was to quantify SHS exposure levels and describe the characteristics of waterpipe tobacco venues. Methods: In 2012-2014 we conducted ...
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Smoke-free Turkey: Evaluation of outdoor areas of public places
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Publisher and Date:(Academic Press Inc Elsevier Science, 2019)Significance: Secondhand tobacco smoke (SHS) exposure is a major cause of morbidity and mortality around the world. The objective of this study was to evaluate the presence of smoking in outdoor areas of public places in three largest Turkish cities (Istanbul Ankara and Izmir). Method: For this cross-sectional observational study the Turkish Statistical Institute randomly selected 10 sampling points in each city. Around each sampling point fieldworkers visited the closest bars/nightclubs cafes ...
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Synthesis, biological evaluation and molecular docking studies of bis-chalcone derivatives as xanthine oxidase inhibitors and anticancer agents
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Publisher and Date:(Academic Press Inc Elsevier Science, 2019)In this study, a series of B-ring fluoro substituted bis-chalcone derivatives were synthesized by Claisen-Schmidt condensation reactions and evaluated for their ability to inhibit xanthine oxidase (XO) and growth inhibitory activity against MCF-7 and Caco-2 human cancer cell lines, in vitro. According to the results obtained, the bis-chalcone with fluoro group at the 2 (4b) or 2,5-position (4g) of B-ring were found to be potent inhibitors of the enzyme with IC50 values in the low micromolar range. ...
