Browsing by Publisher "Elsevier Science Bv"
Now showing items 1-20 of 50
-
(3+3+2) warped-like product manifolds with Spin(7) holonomy
Authors:
Publisher and Date:(Elsevier Science Bv, 2011)We consider a generalization of eight-dimensional multiply warped product manifolds as a special warped product by allowing the fiber metric to be non-block diagonal. We define this special warped product as a (3 + 3 + 2) warped-like manifold of the form M = F x B. where the base B is a two-dimensional Riemannian manifold and the fibre F is of the form F = F-1 x F-2 where the F-i(i = 1 2) are Riemannian 3-manifolds. We prove that the connection on M is completely determined by the requirement that ...
-
A glycidyl methacrylate-based resin with pendant urea groups as a high capacity mercury specific sorbent
Authors:
Publisher and Date:(Elsevier Science Bv, 2003)Polymer-supported pendant urea groups have been demonstrated to be very efficient in selective removal of mercuric ions from aqueous solutions. Methyl methacrylate (0.5 mol)-glycidyl methacrylate (0.4 mol)-divinylbenzene (0.1 mol) terpolymer beads have been prepared by suspension polymerisation. Urea functions have been incorporated into the bead polymer (210-420 mum) via a two-step modification of the epoxy groups involving firstly reaction with excess of triethylenetetramine followed by acidic ...
-
Alternative models for markets with nonconvexities
Authors:
Publisher and Date:(Elsevier Science Bv, 2017)In many electricity markets, the market operator solves a social welfare maximization (SW) model to determine market prices and generation (and consumption) "dispatch" instructions to firms participating in the market. When generation costs (or consumption benefits) are described as mixed integer programs, linear prices cannot, in general, be found such that all market participants are satisfied that the operator's dispatch instructions maximize profits, i.e., they perceive an opportunity cost. ...
-
An Applied Analysis for whether the Relation between Innovation and Foreign Direct Investment is Vicious for Turkey after the early 1980s
Authors:
Publisher and Date:(Elsevier Science Bv, 2016)The relation between innovation and foreign direct investment (FDI) is investigated in this paper by using time series Vector Autoregression (VAR) method. The main research question of the paper is whether FDI contributes on development of innovation in Turkey or vice versa. In Turkey after the structural transformations in Turkish economy export led growth is taken as vein that feeds to the economic development and thus importance of foreign direct investments have been increasing in the post-1980 ...
-
Assessment of chromite liberation spectrum on microscopic images by means of a supervised image classification
Authors:
Publisher and Date:(Elsevier Science Bv, 2017)Assessment of mineral liberation spectrum with all its aspects is essential for plant control and optimization. This paper aims to estimate 2D mineral map and its associated liberation spectrum of a particular chromite sample from optical micrographs by using Random Forest Classification a powerful machine-learning algorithm implemented on a user-friendly and an open-source software. This supervised classification method can be used to accurately generate 2D mineral map of this chromite sample. ...
-
Behavioral Biases Of Finance Professionals: Turkish Evidence
Authors:
Publisher and Date:(Elsevier Science Bv, 2016)This study extends the existing literature on the determinants of behavioral biases of Turkish finance sector professionals. It examines the impact of various personal and objective attributes of finance sector professionals on their risk choices derived from their portfolio allocation and personal wealth data. Utilizing survey data from 206 professionals we find that these professionals take higher risk in the form of investment in equities when investing in home country firms (geographic bias) ...
-
Characteristics and geochemistry of Precambrian ophiolites and related volcanics from the Istanbul-Zonguldak Unit Northwestern Anatolia Turkey: following the missing chain of the Precambrian South European suture zone to the east
Authors:
Publisher and Date:(Elsevier Science Bv, 2004)The Precambrian metamorphic basement of the Istanbul-Zonguldak Unit (IZU) NW Anatolia Turkey is represented by the Sunnice Group composed essentially of four different metamorphic assemblages: (1) Cele metaophiolite (2) Yellice metavolcanics (3) Demirci metamorphics and (4) Dirgine metagranite. The field relations and structural characteristics of these units were studied and representative geochemical analyses of Cele metaophiolite and related volcanics were obtained from the Sunnice Almacik and ...
-
Chebyshev nets formed by Ricci curves in a 3-dimensional Weyl space
Authors:
Publisher and Date:(Elsevier Science Bv, 2005)In this paper Ricci curves in a 3-dimensional Weyl space W-3(g T) are defined and it is shown that any 3-dimensional Chebyshev net formed by the three families of Ricci curves in a W-3(g T) having a definite metric and Ricci tensors is either a geodesic net or it consists of a geodesic subnet the members of which have vanishing second curvatures. In the case of in indefinite Ricci tensor only one of the members of the geodesic subnet under consideration has a vanishing second curvature. (c) 2004 ...
-
Cognitive impairment in amyotrophic lateral sclerosis: evidence from neuropsychological investigation and event-related potentials
Authors:
Publisher and Date:(Elsevier Science Bv, 2002)The presence of subclinical cognitive impairment in patients with amyotrophic lateral sclerosis (ALS) is investigated using neuropsychological assessment and event-related potential recordings (ERP). An extensive battery of neuropsychological tests assessing the domains of attention memory language visuo-spatial and executive functions were administered to 20 non-demented patients with sporadic ALS and 13 age- and education-matched healthy control subjects. Mismatch negativity (MMN) P3b P3a (novelty ...
-
Detached eddy simulation of shallow mixing layer development between parallel streams
Authors:
Publisher and Date:(Elsevier Science Bv, 2015)Results of a high resolution Detached Eddy Simulation (DES) are used to characterize the evolution of a shallow mixing layer developing between two parallel streams in a long open channel with a smooth flat bed and medium size dunes. The study discusses the vertical non-uniformity in the mixing layer structure and provides a quantitative characterization of the growth of the large-scale quasi two-dimensional (2D) coherent structures with the distance from the splitter plate. Results show that in ...
-
Electrical activity regulates AChR gene expression via JNK PKC zeta and Sp1 in skeletal chick muscle
Authors:
Publisher and Date:(Elsevier Science Bv, 2001)Electrical activity of myotubes represses nicotinic acetylcholine receptor (AChR) gene expression. This effect is mimicked by okadaic acid and blocked by tetrodotoxin (TTX) or staurosporine in cultured myocytes [Altiok et al. EMBO J. 16 (1997) 717-725]. In this study we investigated the mechanism of this repression. We show that addition of exogenous phospholipase D (PLD) and C inhibits AChR expression in a manner which parallels that of okadaic acid. Furthermore okadaic acid caused an increase ...
-
Electrochromic properties of heat-treated thin films of CeO2-TiO2-ZrO2 prepared by sol-gel route
Authors:
Publisher and Date:(Elsevier Science Bv, 2008)CeO2-TiO2-ZrO2 thin films were prepared using the sol-gel process and deposited on glass and ITO-coated glass substrates via dipcoating technique. The samples were heat treated between 100 and 500 degrees C. The heat treatment effects on the electrochromic performances of the films were determined by means of cyclic voltammetry measurements. The structural behavior of the film was characterized by atomic force microscopy and X-ray diffraction. Refractive index extinction coefficient and thickness ...
-
Employee connections. The multidimensional team management scorecard
Authors:
Publisher and Date:(Elsevier Science Bv, 2015)Many organizations that resist change are missing growing opportunities
-
Energy consumption-GDP nexus: heterogeneous panel causality analysis
Authors:
Publisher and Date:(Elsevier Science Bv, 2012)Existing studies examining the Granger causality relationship between energy consumption and GDP use a panel of countries but implicitly assume that the panels are homogeneous. This paper extends the Granger causality relationship between energy consumption and GDP by taking into account panel heterogeneity. For this purpose we use a large panel of 79 countries for the period 1980-2007. Specifically we examine four different causal relationships: homogeneous non-causality homogeneous causality ...
-
An equivalence class decomposition of finite metric spaces via Gromov products
Authors:
Publisher and Date:(Elsevier Science Bv, 2017)Let (X, d) be a finite metric space with elements P-i, i = 1,..., n and with the distance functions d(ij) The Gromov Product of the "triangle" (P-i, P-j, P-k) with vertices P-t, P-j and P-k at the vertex Pi is defined by Delta(ijk) = 1/2(d(ij) + d(ik) - d(jk)). We show that the collection of Gromov products determines the metric. We call a metric space Delta-generic, if the set of all Gromov products at a fixed vertex P-i has a unique smallest element (for i = 1,., n). We consider the function ...
-
Evaluating machine tool alternatives through modified TOPSIS and alpha-cut based fuzzy ANP
Authors:
Publisher and Date:(Elsevier Science Bv, 2012)The problem of machine tool selection among available alternatives has been critical issue for most companies in fast-growing markets for a long time. In the presence of many alternatives and selection criteria the problem becomes a multiple-criteria decision making (MCDM) machine tool selection problem. Therefore most companies have utilized various methods to successfully carry out this difficult and time-consuming process. In this work both of the most used MCDM methods the modified TOPSIS and ...
-
Formal Safety Assessment for Ship Traffic in the Istanbul Straits
Authors:
Publisher and Date:(Elsevier Science Bv, 2015)Formal Safety Assessment is a very important tool for the establishment of safety systems according to marine safety. FSA methodology has been recommended to all the maritime actors by the International Maritime Organization (IMO) as an integrated safety system. In Formal Safety Assessment two main risk methodologies are applied which are quantitative and qualitative risk assessments. Both of these methods are used together in practice. The FSA approach is applied in five main stages. In this study ...
-
Ginkgo biloba extract regulates differentially the cell death induced by hydrogen peroxide and simvastatin
Authors:
Publisher and Date:(Elsevier Science Bv, 2006)Several human diseases have been associated with the overproduction of reactive oxygen species (ROS) and subsequently various antioxidants emerged as potential therapeutic agents that scavenge ROS. As an oxidative stress model of human disease we used hydrogen peroxide (11202) to study effect of ROS on C6 glioma cells as a surrogate for astrocytes. H2O2 induced dose- and time-dependent apoptotic cell death which was preceded by growth arrest and transiently activated the signalling proteins ATF-2 ...
-
Guerrilla advertisement and marketing
Authors:
Publisher and Date:(Elsevier Science Bv, 2012)This study examines the relationships similarities and differences among traditional advertising applications guerrilla art guerrilla marketing and guerrilla advertising all of which are interrelated. Guerrilla advertising differs from traditional advertising in that it is creative and allows for maximum turnover while spending the least amount of money since it is able to benefit from innovative strategies and promotional tactics. Guerrilla marketing employs various techniques which keep costs ...
-
Improving OpenCL programmability with the Heterogeneous Programming Library
Authors:
Publisher and Date:(Elsevier Science Bv, 2015)The use of heterogeneous devices is becoming increasingly widespread. Their main drawback is their low programmability due to the large amount of details that must be handled. Another important problem is the reduced code portability as most of the tools to program them are vendor or device-specific. The exception to this observation is OpenCL which largely suffers from the reduced programmability problem mentioned particularly in the host side. The Heterogeneous Programming Library (HPL) is a ...