Browsing by Publisher "Springer"
Now showing items 21-40 of 65
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Correlation of ternary liquid--liquid equilibrium data using neural network-based activity coefficient model
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Publisher and Date:(Springer, 2014)Liquid--liquid equilibrium (LLE) data are important in chemical industry for the design of separation equipments and it is troublesome to determine experimentally. In this paper a new method for correlation of ternary LLE data is presented. The method is implemented by using a combined structure that uses genetic algorithm (GA)--trained neural network (NN). NN coefficients that satisfy the criterion of equilibrium were obtained by using GA. At the training phase experimental concentration data and ...
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Cultural differences in performance on Eriksen's flanker task
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Publisher and Date:(Springer, 2020)Eriksen's zoom model of attention implies a trade-off between the breadth and resolution of representations of information. Following this perspective, we used Eriksen's flanker task to investigate culture's influence on attentional allocation and attentional resolution. In Experiment1, the spatial distance of the flankers was varied to test whether people from Eastern cultures (here, Turks) experienced more interference than people from Western cultures (here, Americans) when flankers were further ...
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Determinants of corporate cash holdings: Firm level evidence from emerging markets
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Publisher and Date:(Springer, 2017)The objective of this chapter is to investigate the factors affecting corporate cash holdings in five emerging markets namely Brazil Indonesia Mexico Russia and Turkey. The sample consists of 1991 firms listed on the major stock exchange of their countries and covers the period between 2009 and 2015. The model is estimated by Arellano–Bond dynamic generalized method of moments. Results show that firms which use higher leverage in their capital structure hold more cash. More profitable firms are ...
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Developing adaptive multi-device applications with the Heterogeneous Programming Library
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Publisher and Date:(Springer, 2015)The usage of heterogeneous devices presents two main problems. One is their complex programming a problem that grows when multiple devices are used. The second issue is that even if the codes for these devices can be portable on top of OpenCL they lack performance portability effectively requiring specialized implementations for each device to get good performance. In this paper we extend the Heterogeneous Programming Library (HPL) which improves the usability of heterogeneous systems on top of ...
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Docking-based virtual screening for potential activity against bacterial pyruvate kinase
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Publisher and Date:(Springer, 2017)
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Drying process in vapor swollen heterogels
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Publisher and Date:(Springer, 2010)Disk-shaped heterogels were prepared by combining methyl methacrylate (MMA) and styrene (S) with ethylene glycol dimethacrylate (EGDM) as a crosslinker agent in the presence of 22'-azobisisobutyronitrile (AIBN). Swelling experiments were performed under chloroform vapor and the swollen gels are then allowed to dry under room temperature. Gravimetric technique was used to study drying processes. It is observed that two different regimes are present in the drying processes of these heterogels. Fickian ...
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Dynamic network analysis of online interactive platform
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Publisher and Date:(Springer, 2019)The widespread use of online interactive platforms including social networking applications community support applications draw the attention of academics and businesses. The basic trust of this research is that the very nature of these platforms can be best described as a network of entangled interactions. We agree with scholars that these platforms and features necessitate the call for theory of network as a novel approach to better understand their underpinnings. We examine one of the leading ...
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Effect of LCST on the swelling of PAAm-NIPA copolymers: a fluorescence study
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Publisher and Date:(Springer, 2012)Temperature sensitive copolymers were prepared by free radical crosslinking copolymerization in aqueous solution with different molar percentage of N-isopropylacrylamide (NIPA) and acrylamide (AAm) monomers. NN'-methylenebis (acrylamide) (BIS) and ammonium persulfate (APS) were used as a crosslinker and an initiator respectively. The steady-state fluorescence (SSF) technique was used to determine the low critical phase transition temperature (LCST) for PAAm-NIPA copolymers. Swelling experiments ...
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Five-year surveillance of nosocomial infections following orthopedic surgery in a private medical center
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Publisher and Date:(Springer, 2008)Introduction Nosocomial infections (NI) are a major problem in health care facilities resulting in extended length of stay substantial morbidity and mortality and excess cost. In this study we aimed to know the rates distribution profiles of NIs following orthopedic surgery and share our first 5-year experience in a private medical center. Materials and methods There is an active prospective and laboratory-based surveillance program since January 1999 at Florence Nightingale Hospital in Istanbul ...
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Fluorescence study on drying of iota-carrageenan gels at different temperatures prepared with various CaCl2 content
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Publisher and Date:(Springer, 2011)The influence of temperature and salt content on drying was investigated by using steady-state fluorescence (SSF) technique. Supporting gravimetric and volumetric measurements were also carried out during drying of gels at various temperatures. iota-Carrageenan gels were prepared with various CaCl2 content. Pyranine was introduced as a fluorescence probe during gel preparation. Apparent fluorescence intensity I was measured during in situ drying process at each temperature and it was observed that ...
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Fully decentralized, collaborative multilateration primitives for uniquely localizing WSNs
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Publisher and Date:(Springer, 2009)We provide primitives for uniquely localizing WSN nodes. The goal is to maximize the number of uniquely localized nodes assuming a fully decentralized model of computation. Each node constructs a cluster of its own and applies unique localization primitives on it. These primitives are based on constructing a special order for multilaterating the nodes within the cluster. The proposed primitives are fully collaborative and thus the number of iterations required to compute the localization is fewer ...
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Growth kinetics of MPS-capped CdS quantum dots in self-assembled thin films
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Publisher and Date:(Springer, 2012)For this study we prepared colloidal CdS quantum dots using 3-mercaptopropyltrimethoxysilane as capping agent. Colloidal CdS quantum dots were directly deposited on glass substrates by a spin-coating process. Coated substrates were heat-treated between 225A degrees C and 325A degrees C for various heat treatment time intervals to investigate the growth kinetics of the quantum dots. Results showed that sizes of the CdS quantum dots grew approximately from 2.9 to 4.6 nm and the E (1s1s) energy values ...
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Intraspinal metalloma resulting in late paraparesis
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Publisher and Date:(Springer, 2005)The metal-related complications caused by orthopedic implants have long been a concern but these problems have been considered mostly in the field of arthroplasty or internal fixation of fractures. The recent prevalence of spinal instrumentation has evoked a similar concern among spine surgeons. Here we present a case of intraspinal metallosis adjacent to the pedicular hook occurring after treatment of vertebral fracture by posterior spinal instrumentation and fusion and causing paraparesis at the ...
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Invented Myths in Contemporary Turkish Political Advertising
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Publisher and Date:(Springer, 2016)This article focuses on the November 2015 elections in Turkey and analyzes the discourses embedded in the political campaign videos produced and circulated by the Justice and Development Party (ruling party since 2002) Republican People's Party (first political party of the republic) People's Democratic Party (main vehicle of the Kurdish politics) and Nationalist Movement Party (ethno-nationalist party). Republic of Turkey's construction in the national imagination over the past 90 years have both ...
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Investigation of intrinsic dynamics and allosteric coupling in human beta 2-adrenergic receptor
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Publisher and Date:(Springer, 2017)
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Joint Channel Estimation and Symbol Detection for OFDM Systems in Rapidly Time-Varying Sparse Multipath Channels
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Publisher and Date:(Springer, 2015)In this paper we propose a space-alternating generalized expectation maximization (SAGE) based joint channel estimation and data detection algorithm in compressive sensing (CS) framework for orthogonal frequency-division multiplexing (OFDM) systems in rapidly time-varying sparse multipath channels. Using dynamic parametric channel model the sparse multipath channel is parameterized by a small number of distinct paths each represented by the path delays and path gains. In our model we assume that ...
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Joint data detection and channel estimation for uplink MC-CDMA systems over frequency selective channels
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Publisher and Date:(Springer, 2007)This paper is concerned with joint channel estimation and data detection for uplink multicarrier code-division multiple-access (MC-CDMA) systems ill the presence of frequency fading channel. The detection and estimation implemented at the receiver are based on a version of the expectation maximization (EM) algorithm which is very suitable for the the multicarrier signal formats. Application of the EM-based algorithm to the problem of iterative data detection and channel estimation leads to a ...
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Kinetic models for the dynamical behavior of polyacrylamide (PAAm)-kappa-carrageenan (kappa C) composite gels
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Publisher and Date:(Springer, 2015)A fluorescence method was employed for studying the drying and swelling of PAAm-kappa C composite gels which were formed from acrylamide (AAm) and N N'- methylenebisacrylamide (BIS) with various kappa-carrageenan (kappa C) contents by free radical crosslinking copolymerization in water. Composite gels were prepared at 80 A degrees C with pyranine (Py) as a fluorescence probe. Scattered light I (sc) and fluorescence emission intensities I (em) were monitored during drying and swelling of these gels. ...
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Laparoscopic transabdominal isthmic cerclage in a case of cervical agenesis and a successful pregnancy with ICSI
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Publisher and Date:(Springer, 2007)The objective was to construct a laparoscopic transabdominal isthmic cerclage in a patient with cervical agenesis at Kadir Has University Metropolitan Florence Nightingale Hospital. A 39-year-old woman diagnosed with primary infertility due to cervical agenesis was admitted to our hospital because of recurrent assisted reproductive technique (ART) failures. She underwent three operations for acute abdominal pain due to endometriosis and pyometra. There was a tiny fistula-like opening at the level ...
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Machine learning model to predict an adult learner's decision to continue ESOL course
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Publisher and Date:(Springer, 2019)This study investigated the ability of the demographic and the affective variables to predict the adult learners' decision to continue ESOL courser. 278 adult learners, enrolled on ESOL course at FLS institution in Istanbul, Turkey, participated in the study. The result showed that the continued or dropped out groups, demonstrated statistical differences in the demographic variable (the placement test score) with a magnitude of large effect size (.378). Additionally, the result showed the effect ...