bluuebunny/crossref_metadata_2025_split huggingface dataset:
Influence of hard segment size on the melt transition temperature of thermoplastic rubbers
Authors: Canevarolo Sebastião V. , Birley Arthur W. 
Published: February 2013

AbstractThermoplastic rubbers on heating show a melt rheological transition which is interpreted as the onset of breakdown in the long‐range order of the domain structure. This is mainly due to the mobility of the PS end‐blocks which, from this temperature upwards, can be removed from their base‐phase by forces exerted by the attached rubbery chain. The transition temperature is detected by a change in the slope of an Arrhenius plot of the Melt Flow Index values at various temperatures, for a wide range of samples. The transition temperature is shown to be directly related to the molecular weight of the hard‐block segments (PS), supporting the molecular model proposed previously.
NORMATIVE DATA FOR IQ, HEIGHT AND HEAD CIRCUMFERENCE FOR CHILDREN IN SAUDI ARABIA
Authors: BATTERJEE ADEL A. , KHALEEFA OMAR , ASHAER KHALIL , LYNN RICHARD 
Published: February 2013

SummaryNormative data are reported for intelligence, height and head circumference for a sample of 1553 6- to 15-year-olds in Saudi Arabia, and for the correlations between these variables. Intelligence was tested with the Standard Progressive Matrices, on which the Saudi sample obtained a British IQ of 76.2. There were no significant differences in means between boys and girls and differences in variability were inconsistent. The heights of the Saudi sample were generally lower than those of the American norms. The differences in head circumferences between the Saudi children and the American norms were inconsistent. Correlations between IQ and height were weaker than those found in other studies but correlations between IQ and head circumference were positive.
Turbulence evolution in MHD plasmas
Authors: WISNIEWSKI MARTINA , KISSMANN RALF , SPANIER FELIX 
Published: February 2013

AbstractTurbulence in the interstellar medium has been an active field of research in the last decade. Numerical simulations are the tool of choice in most cases. However, while there are a number of simulations on the market, some questions have not been answered finally. In this paper, we examine the influence of compressible and incompressible driving on the evolution of turbulent spectra in a number of possible interstellar medium scenarios. We conclude that the driving has an influence not only on the ratio of compressible to incompressible component but also on the anisotropy of turbulence.
Accretion disk parameters in HLX-1
Authors: Soria Roberto , Hau George 
Published: February 2013

AbstractWe estimate the outer radius of the accretion disk in HLX-1 from its optical brightness and from the exponential timescale of the decline in the X-ray lightcurve after an outburst. We find that the disk is an order of magnitude smaller than the semimajor axis of the orbit. If the disk size is determined by the circularization radius near periastron, the eccentricity of the binary system must be ≳ 0.95. We report on the discovery of Hα emission during the 2012 outburst, with a single-peaked, narrow profile (consistent with a nearly face-on view), and a central velocity displaced by ≈ 490 km s−1 from that of the host galaxy.
Deriving fundamental parameters of millisecond pulsars via AIC in white dwarfs
Authors: Taani A. , Zhang C. M. , Zhao Y. H. , Moraghan A. 
Published: February 2013

AbstractWe present a study of the observational properties of Millisecond Pulsars (MSPs) by way of their magnetic fields, spin periods and masses. These measurements are derived through the scenario of Accretion Induced Collapse (AIC) of white dwarfs (WDs) in stellar binary systems, in order to provide a greater understanding of the characteristics of MSP populations. In addition, we demonstrate a strong evolutionary connection between neutron stars and WDs with binary companions from a stellar binary evolution perspective via the AIC process.
A systematic search for rapid photometric variability in southern symbiotic stars I. V648 Car
Authors: Angeloni Rodolfo , Di Mille Francesco , Lopes Carlos Eduardo Ferreira , Masetti Nicola 
Published: February 2013

AbstractWe present the first results from the systematic observational campaign aimed at studying rapid photometric variability (i.e., flickering) in southern symbiotic stars. In particular, we report on the discovery of strong flickering from V648Car (also known as SS73-17), a poorly studied system belonging to the small class of hard X-ray emitting symbiotic stars. To our knowledge, with a U-band flickering amplitude >0.6mag over time scales of minutes, it is one of the most significant flickering ever reported from a symbiotic star.
Water fountains: bipolar fast stellar jets traced by water vapor maser emission
Authors: Imai Hiroshi 
Published: February 2013

AbstractHighly collimated, bipolar fast jets are found in asymptotic giant branch (AGB) and post-AGB stars as well as in active galactic nuclei and young stellar objects. It is still unclear how to launch such jets from dying stars that were originally spherically symmetric. Exploration of the stellar jet evolution is also expected to probe its role in shaping a planetary nebula. Interestingly, some of stellar H2O maser sources — water fountains — exhibit stellar jets with spatially and kinematically high collimation in the earliest phase (<1000 years) of the jet evolution. Such water fountains have been identified in 14 sources to date. We have recently conducted interferometric (VLBA, EVN, VERA, VLA) maser and the single-dish (ASTE) CO J = 3 → 2 line observations of the water fountains. They have revealed a typical dynamical age (< 100 yr) and the detailed kinematical structures of the water fountains, possibility of the coexistence of “equatorial flows”, and their locations and kinematics in the Milky Way. Based on these results, the masses and evolutionary statuses of the host stars are also estimated.
Minimum accretion rate for millisecond pulsar formation in binary system
Authors: Pan Yuanyue , Zhang Chengmin , Wang Na 
Published: February 2013

Abstract186 binary pulsars are shown in the magnetic field versus spin period (B-P) diagram, and their relations to the millisecond pulsars can be clearly seen. We declaim a minimum accretion rate for the millisecond pulsar formation both from the observation and theory. If the accretion rate is lower than the minimum accretion rate, the pulsar in binary system will not become a millisecond pulsar after the evolution.
Constraining the Accretion Flow in Sgr A* by General Relativistic Dynamical and Polarized Radiative Modeling
Authors: Shcherbakov Roman V. , Penna Robert F. , McKinney Jonathan C. 
Published: February 2013

AbstractWe briefly summarize the method of simulating Sgr A* polarized sub-mm spectra from the accretion flow and fitting the observed spectrum. The dynamical flow model is based on three-dimensional general relativistic magneto hydrodynamic simulations. Fully self-consistent radiative transfer of polarized cyclo-synchrotron emission is performed. We compile a mean sub-mm spectrum of Sgr A* and fit it with the mean simulated spectra. We estimate the ranges of inclination angle θ=42°–75°, mass accretion rate Ṁ=(1.4-7.0)×10−8M⊙year−1, and electron temperature Te=(3–4)×1010K at 6M. We discuss multiple caveats in dynamical modeling, which must be resolved to make further progress.
Resonant switch model of twin peak HF QPOs applied to the atoll source 4U 1636-53
Authors: Stuchlík Zdeněk , Kotrlová Andrea , Török Gabriel 
Published: February 2013

AbstractWe present a Resonant Switch (RS) model of twin peak high-frequency quasi-periodic oscillations (HF QPOs), assuming switch of twin oscillations at a resonant point, where frequencies of the upper and lower oscillations νU and νL become to be commensurable and the twin oscillations change from one pair of the oscillating modes (corresponding to a specific model of HF QPOs) to some other pair due to non-linear resonant phenomena. The RS model enables to determine range of allowed values of spin a and mass M of the neutron star located at the atoll source 4U 1636-53 where two resonant points are observed at frequency ratios νU : νL = 3:2, 5:4.
Distribution of twin kHz QPOs in LMXBs
Authors: Wang D. H. , Chen L. 
Published: February 2013

AbstractWith kilohertz quasi-periodic oscillation (kHz QPO) sources in neutron star low mass X-ray binaries (NS-LMXBs) published up to now, we analyze the centroid frequency (ν) distribution of twin kHz QPOs. We find that Atoll and Z sources show the similar distributions of ν1 and ν2, which indicate that twin kHz QPOs may be the common property of NS-LXMBs and have the similar physical origins. The mean values of ν1 and ν2 in Atoll sources are higher than those in Z sources, and we consider that this may because the QPO signals are sheltered by the thicken accretion disk or corona in Z sources. The maximums of ν2 in both Atoll and Z sources are the same order as the Keplerian orbital frequency of the NS surface, so kHz QPOs could occur near the NS surface.
Multi-wavelength Study of the Be/X-ray Binaries
Authors: Yan J. Z. , Li H. , Zhou J. N. , Liu Q. Z. 
Published: February 2013

AbstractAn anti-correlation between the optical brightness and the strength of the Hα emission was observed from two Be/X-ray binaries, A0535+26 and MXB 0656-072: when the optical brightness showed a decrease, the intensity of the Hα emission displayed an obvious increase. This anti-correlation is interpreted as the result of the mass ejection from the Be star. After the mass ejection event, a cavity or low-density region will be developing in the inner parter of the circumstellar disk. The X-ray outbursts of the Be/X-ray binaries might be connected with the mass ejections from the Be star.
Archiving in the networked world: resource description framework
Authors: Seadle Michael 
Published: February 2013

PurposeThe aim of this paper is to examine a project where resource description framework (RDF) is expected to function both in the short term and over long periods. Because RDF is comparatively new, the library and information science literature has scarcely addressed the issues.Design/methodology/approachThe article analyses RDF from the perspective of the requirements for long term digital archiving, with special emphasis on the need for maintaining integrity and usability.FindingsRDF and RDFa (resource description framework in attributes) encoding can be archived, but the external references that make RDF function may change their meaning or vanish over time, unless efforts are made to archive them too and to provide time‐based context information through mechanisms like Memento. RDF‐based “triple store” databases can likewise be archived.Originality/valueThe value of this article lies in its examination of how RDF and its variants will work within the constraints of current long term digital archiving systems. RDF is relatively new, but its proponents see it as a long term enhancement of the web and of internet‐connected projects. This requires some consideration about how it will function in 100 years or more.
Customer dominant value formation in service
Authors: Heinonen Kristina , Strandvik Tore , Voima Päivi 
Published: February 2013

PurposeThe purpose of this paper is to extend current discussions of value creation and propose a customer dominant value perspective. The point of origin in a customer‐dominant marketing logic (C‐D logic) is the customer, rather than the service provider, interaction or the system. The focus is shifted from the company's service processes involving the customer, to the customer's multi‐contextual value formation, involving the company.Design/methodology/approachValue formation is contrasted to earlier views on the company's role in value creation in a conceptual analysis focusing on five central aspects. Implications of the proposed characteristics of value formation compared to earlier approaches are put forward.FindingsThe paper highlights earlier hidden aspects on the role of a service for the customer. It is proposed that value is not always an active process of creation; instead, value is embedded and formed in the highly dynamic and multi‐contextual reality and life of the customer. This leads to a need to look beyond the line of visibility focused on visible customer‐company interactions, to the invisible and mental life of the customer. From this follows a need to extend the temporal scope, from exchange and use even further to accumulated experiences in the customer's life and ecosystem.Research limitations/implicationsThis paper is conceptual. It discusses and presents a customer‐dominant value perspective and suggests implications for empirical research and practice.Practical implicationsAwareness of the mechanism of the customer value formation process provides companies with new insight on the service strategy, service design and new service innovations.Originality/valueThe paper contributes by extending the value construct through a new customer dominant value perspective, recognizing value as multi‐contextual and dynamic based on customers' life and ecosystem. The findings mark out new avenues for future research.
Researching into the methodology for the evaluation of deformed soft furniture upholstery
Authors: Jucienė Milda , Vobolis Jonas 
Published: February 2013

PurposeThe purpose of this paper is to evaluate upholstery deformation by using resonant vibrations of separate zones of the soft part.Design/methodology/approachBy recording the value of resonant frequency at separate points of the plane, it becomes possible to obtain the graph of deformation distribution. It is compared to the graph that demonstrates how rigidity distributes itself in different directions within the upholstery fabric. This enables the evaluation of unevenness of upholstery deformation that is present in different directions.FindingsThe provided methodology allows assessing the quality of soft furniture assembly and predicting the exploitation time for its upholstery.Originality/valueThe test results obtained using the original methodology enable the assessment of manufacturing defects existing in various directions (for example, the shape of different parts during the cutting process, the unevenness of seam width and others), as well as the quality of furniture during the production and exploitation process.
Organizational learning in educational settings (technical): an Indian perspective
Authors: Patnaik B. , Beriha G.S. , Mahapatra S.S. , Singh N. 
Published: February 2013

PurposeThis paper seeks to present an empirical study on organizational learning in Indian educational organizations.Design/methodology/approachThe Learning Organization Profile (LOP) Survey is used as the tool for eliciting responses from the staff regarding the nature and state of organizational learning prevailing in educational settings. The study attempts to highlight the extent of organizational learning in technological institutes of repute in both the public and private sectors in India. Factor analysis and descriptive statistics have been used to analyze data and to make comparisons vis‐à‐vis ownership of organization and employee category.FindingsResults indicate that the extent of organizational learning is below the expected level in both public and private sectors. Significant difference exists between public and private organizations in terms of the extent as well as dimensions of organizational learning. As leadership has emerged as the most valued factor in the private sector institutes and third among eight dimensions in the public ones, the onus lies in leading these institutes with able managers who inspire the employees to learn and adapt. The management has opportunity to enhance the potential of the academic institutes for learning by choosing effective leaders who provide direction and vision for employees. The role of transformational leadership is important in the context of Indian technological institutes.Originality/valueDevelopment of learning culture is becoming a dominant theme in the strategic plans of many organizations today. Hence, it is vital to investigate the nature and extent of organizational learning as prevailing in the sector of higher education and learning, specifically in the Indian context. The study differentiates organizational learning practices in public and private undertakings. It also examines the dimensions of organizational learning as experienced by different categories of employees constituting the organization.
The corrosive effects of artificial saliva on cast and rapid manufacture‐produced cobalt chromium alloys
Authors: Alifui‐Segbaya Frank , Foley Paul , Williams R.J. 
Published: February 2013

PurposeRapid manufacture‐produced cobalt chromium alloys are beginning to be used in dentistry but there are few published results relating to their properties. The purpose of this paper is to determine the corrosion resistance of a rapid manufacture‐produced dental alloy and compare it to a standard dental casting alloy.Design/methodology/approachIn accordance with ISO 22674, ten samples of each alloy were fabricated in approximately 45 mm×10 mm×2 mm rectangular prisms, a sample number in excess of the standard requirements. The groups were further divided into those with highly polished surfaces and those with electrobrightened surfaces. Each sample was immersed in artificial saliva, suspended by a nylon thread for 42 days at 37°C. Readings for cobalt, chromium and molybdenum ions released into solutions were obtained using an atomic absorption spectrometer at 1, 4, 7, 14, 21, 28, 35, and 42 day intervals at a detection limit of one part per million.FindingsIon release of cobalt, chromium and molybdenum was well within the threshold prescribed by the standard. The alloys were safe for use as dental devices with respect to the above metals. The rapid manufacture alloy however performed better. In addition the data indicated that for both alloys, there was no discernable difference between a polished and an electrobrightened surface.Originality/valueThe rapid manufacture alloy studied shows a safe level of corrosion resistance with respect to cobalt, chromium and molybdenum according to ISO definitions. Further biocompatibility tests are recommended.
Finite element analysis, stress‐strain distribution and size effects rise during nanoindentation of welded aluminum alloy
Authors: Charitidis Costas A. , Dragatogiannis Dimitrios A. 
Published: February 2013

PurposeThe purpose of this paper is to investigate the use of nanoindentation with a Berkovich indenter as a method of extracting equivalent stress‐strain curves for the base metal and the welded zone of a friction stir welded aluminum alloy.Design/methodology/approachFriction stir welding is a solid‐state joining process, which emerged as an alternative technique to be used in high strength alloys that were difficult to join with conventional joining techniques. This technique has a significant effect on the local microstructure and residual stresses combined with deformation. Nano‐ and micro‐indentation are the most commonly used techniques to obtain local mechanical properties of engineering materials. In order to test the reliability of nanoindentation technique and to connect nanoscale with macroscale, the indentation hardness‐depth relation established by Nix and Gao was applied on the experimental values.FindingsThe predictions of this model were found to be in good agreement with classical hardness measurements on AA 6082‐T6 aluminum alloy. Also, finite element method provides a numerical tool to calculate complex nanoindentation problems and in correlation with gradients theories forms a well‐seried tool in order to take into account size effects.Originality/valueBy studying this alloy, the paper reviews fundamental principles such as stress‐strain distribution, size effects rise during nanoindentation and the applicability of finite element method, in order to take into account these issues.
The association between accounting standards, legal framework and the quality of financial reporting by a government ministry in Uganda
Authors: Korutaro Nkundabanyanga Stephen , Tauringana Venancio , Balunywa Waswa , Naigo Emitu Stephen 
Published: February 2013

PurposeThe purpose of this study is to examine the association between accounting standards, legal framework and the quality of financial reporting by the Ministry of Water and Environment in Uganda.Design/methodology/approachThe study used a self‐administered questionnaire to survey 120 staff and stakeholders of the Ministry of the Water and Environment. Correlation analysis was employed to determine the association between accounting standards, legal framework and the quality of financial reporting.FindingsResults indicate that accounting standards and legal framework are all positively and significantly associated with the quality of financial reporting, providing evidence of the effect of accounting standards and legal framework on the quality of financial reporting in UgandaResearch limitations/implicationsScarce literature using African data means that it is not possible to compare the findings to previous research.Practical implicationsThe finding of an association between accounting standards, the legal framework and quality of financial reporting implies that the government of Uganda needs to adopt a more robust approach in enforcing compliance to improve the quality of financial reports produced by the Ministry of Water and Environment.Originality/valueThis study contributes to the dearth of evidence on government accounting literature in Africa by investigating for the first time, the association between accounting standards, legal framework and the quality of financial reporting by a government department.
Global mindset, global success at Tata Consultancy Services
Authors: March Richard 
Published: February 2013

PurposeThe purpose of this paper is to exemplify how Mr Surya Kant, President of North American, UK and European Operations in Tata Consultancy Services (TCS), leads and grows a complex global company by adopting and operationalizing a global mindset.Design/methodology/approachThis paper applies a social constructionist interview method, which focuses upon the reflectivity of the research in critically constructing meaning from qualitative data collected through personal interviews. The paper links information gleaned from a semi‐structured interview with Mr Kant to a theoretical discussion of the construct of global mindset. In so doing, it demonstrates the paradox of complexity in global leadership and illustrates the applicability of theory in global leadership practice.FindingsThis paper aids in making the case for the application of an inductive qualitative methodology by showing that inductive approaches to business research have, as their base, the lived experiences of people operating in a business context. The paper found a close link among the theoretical constructs of global mindset, paradox theory, complexity, leadership and global business, and their use and applicability in driving a global corporation.Originality/valueIn making explicit the links between theory and practice, this paper illuminates the practical application of academic literature and theoretical constructs in the arena of global business and global leadership, thereby bridging the oft‐cited theoretician‐practitioner‐bifurcation in business research.