bluuebunny/crossref_metadata_2025_split huggingface dataset:
Social discovery tools: extending the principle of user convenience
Authors: Spiteri Louise F. 
Published: February 2012

PurposeNew social discovery systems have social‐type Web 2.0 features that allow users to enhance the content of bibliographic records by adding their own tags, ratings, and reviews. One of the primary underlying principles of cataloguing is that catalogue records be designed with the user in mind, i.e. user convenience. The purpose of this paper is to explore the relationship between the principle of user convenience and social discovery systems.Design/methodology/approachA review of the literature and codes of ethics of associations of information professions was undertaken to examine: the ethical dimensions of creating catalogue records to reflect user convenience, the relationship between culture and user convenience, and how social discovery tools can facilitate the creation of interactive and flexible catalogue records that reflect the culture(s) and needs of the library communities in which they exist.FindingsSocial discovery systems can address the primary barriers to creating catalogue records that meet user convenience: determining and reflecting the needs and cultural warrant of the users, and maintaining the quality and integrity of the catalogue records.Practical implicationsSocial discovery systems can serve as a bridge between cataloguers' desire to create accurate catalogue records that conform to accepted cataloguing standards, and their ethical imperative to ensure that these records meet the needs of the clients.Originality/valueThe findings of this study pave the way for further research into how user‐contributed metadata allow clients to express their needs and cultural warrant and to interact with one another and library staff.
The influence of honing process parameters on surface quality, productivity, cutting angle and coefficients of friction
Authors: Vrac Damir S. , Sidjanin Leposava P. , Kovac Pavel P. , Balos Sebastian S. 
Published: February 2012

PurposeThe purpose of this paper is to explore the influence of tool kinematics parameters on surface roughness, productivity and cutting angle for grey cast iron cylinder liners machined by normal honing.Design/methodology/approachFor experimental investigation, a long stroke honing system was used. Diamond and SiC tools were used, for pre‐ and finishing, respectively. The values of cutting parameters were varied within the following limits: cutting speed vs=0.931‐1.11 m/s; specific pressure of pre‐honing process pd=1.0‐1.4 N/mm2 and specific pressure of finishing honing process pz=0.2‐0.5 N/mm2. The analysis of dispersion was conducted for determining the mathematical model for cutting parameter influence on surface roughness and productivity.FindingsDispersion analysis proved that the most influential parameters on maximum roughness depth are cutting speed for D181 tool and specific pressure of finishing honing for D151 tool. The most influential parameter on productivity in the honing process with D181 and D151 tool is cutting speed.Originality/valueThe paper gives new information related to the normal honing optimization process. Normal honing offers the highest surface quality which is achieved by a low speed machining. However, that means also a relatively low productivity, demanding a thorough process optimization. Furthermore, normal honing is usually done by ECH pre‐honing and mechanical finishing honing, but in this paper, all‐mechanical honing was used for the same result, at a lower lost.
The effect of hexagonal boron nitride additive on the effectiveness of grease‐based lubrication of a steel surface
Authors: Pawlak Zenon , Kałdoński Tadeusz , Lisewski Michal , Urbaniak Wieslaw , Oloyede Adekunle 
Published: February 2012

PurposeThe purpose of this paper is to study the sliding and the vibrating fretting tests mechanism of h‐BN micro‐particles when used as a lubricating grease‐2 additive.Design/methodology/approachThe fretting tests were conducted on steel/steel contacts using both vibrating fretting apparatus and the shaft‐sleeve slide fitted tester. The wear scars were characterized with profilometry. The tribological properties of grease‐2 compounded with h‐BN additive were also compared to those obtained for the commercial product Militec‐4.FindingsThe experiment showed significant differences between the results obtained from the vibrating fretting and the shaft‐sleeve sliding fitted tests. Adding h‐BN to the lubricant leads to a better performance in the shaft‐sleeve slide regime than in the steel/steel vibrating test condition.Originality/valueThe results of the experimental studies demonstrate the potential of h‐BN as an additive for preventing fretting sliding, and can very useful for further application of compound grease‐2 with h‐BN additive in industrial equipment.
Tribological properties of polytetrafluoroethylene as additive in titanium complex grease
Authors: Jiguo Chen 
Published: February 2012

PurposeThe purpose of this paper is to study, analyze and present the lubricating mechanism and tribological properties of two types of oil‐based titanium complex grease containing Polytetrafluoroethylene (PTFE).Design/methodology/approachTwo types of oil‐based sebacic acid/stearic acid titanium complex greases containing PTFE additive were synthesized using 3 L reaction vessel, and the base oils including neopentyl polyol ester and mixed oil of 650SN and neopentyl polyol (1:1.8). Friction‐reduction, antiwear, and load‐carrying properties of greases were evaluated using a four‐ball tester, and their dropping point and penetration were characterized using relevant ASTM standards. Morphologies of wear scar and chemical states of typical elements on worn surfaces were characterized by means of scanning electron microscope and X‐ray photoelectron spectroscopy, respectively.FindingsTribological results show that titanium complex grease containing PTFE had better friction‐reduction and antiwear properties than base grease. However, PTFE could not improve the load‐carrying capacity of base grease. Moreover, a synergistic effect between deposited film and adsorptive film contributes to good tribological properties of titanium complex grease.Practical implicationsSuch a very useful lubricating material could be used in industrial applications including steel plants, power plants, packaging, and fertilizer industries.Originality/valueThe lubricating mechanism of titanium complex grease containing PTFE was proposed by tribochemical analysis of worn surfaces. The mechanism should become the direction of the theoretical and applied research of grease in the future.
Enhancing employee outcomes
Authors: San Lam Cheok , O'Higgins Eleanor R.E. 
Published: February 2012

PurposeThe purpose of this paper is to examine the interrelated influences of managers' emotional intelligence, leadership styles and employee outcomes. In particular, this study aims to explore the potential mediating effects of managers' transformational leadership style on the relationships between managers' emotional intelligence and employee outcomes of: employee performance, job satisfaction, organisational commitment and job stress.Design/methodology/approachThe study was conducted in two large organisations in Shanghai, China, on a sample of 323 participants, including both managers and subordinate employees. Emotional intelligence was measured by using the Wong Emotional Intelligence Scale (WEIS), and leadership style, using the Multifactor Leadership Questionnaire (MLQ‐5x Short).FindingsThe results showed that managers' transformational leadership style fully mediates the relationship between managers' emotional intelligence and employee job satisfaction. However, no mediating effect of managers' transformational leadership style is found on the relationship between managers' emotional intelligence and employee performance, organizational commitment and job stress.Originality/valueThe results of this study contribute to current insights about the interrelationships on managers' emotional intelligence, leadership style and employee outcomes, showing that the power of managers' emotional intelligence on job satisfaction must be expressed through a third mediating variable, transformational leadership.
A structuralist perspective on economic growth in China and India: anticipating the end game
Authors: Babones Salvatore J. 
Published: February 2012

PurposeThe purpose of this paper is to examine a much‐overlooked aspect of the rise of China: when will it end? Obviously, the Chinese economy will not grow at an annual rate of 10 percent forever. At some point Chinese growth will stabilize. When is of vast importance for the political, economic, and ecological future of the world.Design/methodology/approachData from the World Development Indicators database are used to benchmark the recent economic growth of China (and India) to the long‐term trajectory of Brazil. A structuralist approach derived from world‐systems analysis predicts that Chinese growth will stabilize once China reaches an equilibrium income level characteristic of the semiperiphery of the world‐economy.FindingsBased on recent trends, the structuralist perspective suggests that China's extraordinary rate of economic growth will fall back to global norms after 2020. China is unlikely to reach US or EU levels of total national income before mid‐century.Research limitations/implicationsThe research presented here is highly speculative. The data are of very poor quality and the assumptions are quite heroic. That said, the China 2020 prediction is relatively robust to variations in data and assumptions.Social implicationsThe rise of China is unlikely to have much impact on the structure of the modern world economy or the continuation of US hegemony for the foreseeable future, and its impact on greenhouse gas emissions may be less than anticipated.Originality/valueThis study will hopefully open a debate about planning for the end game of rapid Chinese economic growth.
Multiobjective metaheuristics for frequency assignment problem in mobile networks with large‐scale real‐world instances
Authors: da Silva Maximiano Marisa , Vega‐Rodríguez Miguel A. , Gómez‐Pulido Juan A. , Sánchez‐Pérez Juan M. 
Published: February 2012

PurposeThe purpose of this paper is to address a multiobjective FAP (frequency assignment problem) formulation. More precisely, two conflicting objectives – the interference cost and the separation cost – are considered to characterize FAP as an MO (multiobjective optimization) problem.Design/methodology/approachThe contribution to this specific telecommunication problem in a real scenario follows a recent approach, for which the authors have already accomplished some preliminary results. In this paper, a much more complete analysis is performed, including two well‐known algorithms (such as the NSGA‐II and SPEA2), with new results, new comparisons and statistical studies. More concretely, in this paper five different algorithms are presented and compared. The popular multiobjective algorithms, NSGA‐II and SPEA2, are compared against the Differential Evolution with Pareto Tournaments (DEPT) algorithm, the Greedy Multiobjective Variable Neighborhood Search (GMO‐VNS) algorithm and its variant Greedy Multiobjective Skewed Variable Neighborhood Search (GMO‐SVNS). Furthermore, the authors also contribute with a new design of multiobjective metaheuristic named Multiobjective Artificial Bee Colony (MO‐ABC) that is included in the comparison; it represents a new metaheuristic that the authors have developed to address FAP. The results were analyzed using two complementary indicators: the hypervolume indicator and the coverage relation. Two large‐scale real‐world mobile networks were used to validate the performance comparison made among several multiobjective metaheuristics.FindingsThe final results show that the multiobjective proposal is very competitive, clearly surpassing the results obtained by the well‐known multiobjective algorithms (NSGA‐II and SPEA2).Originality/valueThe paper provides a comparison among several multiobjective metaheuristics to solve FAP as a real‐life telecommunication engineering problem. A new multiobjective metaheuristic is also presented. Preliminary results were enhanced with two well‐known multiobjective algorithms. To the authors' knowledge, they have never been investigated for FAP.
Multimodal method for linear liquid sloshing in a rigid tapered conical tank
Authors: Gavrilyuk Ivan , Hermann Marten , Lukovsky Ivan , Solodun Oleksandr , Timokha Alexander 
Published: February 2012

PurposeThe purpose of this paper is to derive linear modal equations describing the forced liquid sloshing in a rigid truncated (tapered) conical tank, as well as to show how to couple these modal equations with “global” dynamic equations of a complex mechanical system carrying this tank.Design/methodology/approachDerivation of the modal equations can be based on the Trefftz variational method developed by the authors in a previous paper. Describing the coupled dynamics utilizes Lukovsky' formulas for the resulting hydrodynamic force and moment due to liquid sloshing.FindingsThe so‐called Stokes‐Joukowski potentials can be found by using the Trefftz method from the authors' previous paper with the same polynomial‐type functional basis. Coupling the modal equations with the global dynamic equations becomes a relatively simple task facilitated by Lukovsky's formulas. Using the linear multimodal method can be an efficient alternative to traditional numerical and analytical tools employed for studying the coupled vibrations of a tower with a conical rigid tank on the tower top.Practical implicationsThe derived modal equations are equipped by tables with the computed non‐dimensional hydrodynamic coefficients. Interested readers (engineers) can incorporate the modal equations into the global dynamic equations of a whole mechanical system without new computations of these coefficients.Originality/valueThe multimodal method can be an alternative to traditional numerical tools. Using the derived modal equations simplifies analytical studies and provides efficient calculations of the coupled dynamics of a mechanical system carrying a rigid tapered conical tank with a liquid.
Low‐complexity 2D DOA estimator for multiple coherently distributed sources
Authors: Zheng Zhi , Li Guangjun , Teng Yunlong 
Published: February 2012

PurposeThe purpose of this paper is to develop a new method for the two‐dimensional direction‐of‐arrival (DOA) estimation of multiple coherently distributed (CD) sources, which can provide lower computational complexity while sustaining the estimation performance within a tolerable level.Design/methodology/approachUsing three parallel uniform linear arrays (ULAs), a new method for parametric estimation of multiple coherently distributed sources is proposed. The proposed method is based on the Taylor approximation to the generalized steering vectors (GSVs) of shifted ULAs, and utilizes the special array geometry. In addition, a simple parameter matching procedure is also given in this paper.FindingsSeveral numerical experiments have been designed. The experiments are based on coherently distributed source model, and the noise is assumed to be zero‐mean and spatially and temporally white and Gaussian. Numerical results show that the proposed method can exhibit good estimation performance under small angular spread and be applicable to the multisource scenario with different angular distributions.Research limitations/implicationsThis research is limited to CD sources. Furthermore, the proposed method is based on the small angular approximation to GSV. Hence, it is fitter for the case of small angular extension.Originality/valueWithout any spectrum‐peak searching, the proposed method provides lower computational cost compared to the classical spectrum‐based methods. Moreover, it does not depend on the prior knowledge about angular distribution shape and is hence robust to mismodeling.
Analysis of the saturated electromagnetic devices under DC bias condition by the decomposed harmonic balance finite element method
Authors: Zhao Xiaojun , Li Lin , Lu Junwei , Cheng Zhiguang , Lu Tiebing 
Published: February 2012

PurposeThis paper aims to introduce the decomposed harmonic balance finite element method (HBFEM) to decrease the memory requirement in large‐scale computation of the DC‐biasing magnetic field. Harmonic analysis of the flux density and flux distribution was carried out to investigate the DC biased problem in a laminated core model (LCM).Design/methodology/approachBased on the DC bias test on a LCM, the decomposed HBFEM is applied to accurately calculate the DC‐biasing magnetic field. External electric circuits are coupled with the magnetic field in the harmonic domain. The reluctivity matrix is decomposed and the block Gauss‐Seidel algorithm solves each harmonic solution of magnetic field and exciting current sequentially.FindingsThe calculated exciting currents and flux density are compared with that obtained from measurement and time domain finite element analysis, respectively, which demonstrates consistency. The DC bias leads to the significant saturation of the magnetic core and serious distortion of the exciting current. The flux density varies nonlinearly with DC bias excitation.Research limitations/implicationsThe harmonic balance method is only applicable in solving the steady state magnetic field. Future improvements in the method are necessary in order to manage the hysteresis effects in magnetic material.Originality/valueThe proposed method to solve the DC biased problem significantly reduces the memory requirement compared to the conventional HBFEM. The decomposed harmonic balance equations are solved efficiently by the block Gauss‐Seidel algorithm combined with the relaxation iterative scheme. An investigation on DC bias phenomena is carried out through the harmonic solution of the magnetic field. The decomposed HBFEM can also be applied to solve 3‐D DC‐biasing magnetic field and eddy current nonlinear problems in a practical power transformer.
A hydrodynamical model for holes in silicon semiconductors
Authors: Mascali Giovanni , Romano Vittorio 
Published: February 2012

PurposeThis paper intends to present a hydrodynamical model which describes the hole motion in silicon and couples holes and electrons.Design/methodology/approachThe model is based on the moment method and the closure of the system of moment equations is obtained by using the maximum entropy principle (hereafter MEP). The heavy, light and split‐off valence bands are considered. The first two are described by taking into account their warped shape, while for the split‐off band a parabolic approximation is used.FindingsThe model for holes is coupled with an analogous one for electrons, so obtaining a complete description of charge transport in silicon. Numerical simulations are performed both for bulk silicon and a p‐n junction.Research limitations/implicationsThe model uses a linear approximation of the maximum entropy distribution in order to close the system of moment equations. Furthermore, the non‐parabolicity of the heavy and light bands is neglected. This implies an approximation on the high field results. This issue is under current investigation.Practical implicationsThe paper improves the previous hydrodynamical models on holes and furnishes a complete model which couples electrons and holes. It can be useful in simulations of bipolar devices.Originality/valueThe results of the paper are new since a better approximation of the band structure is used and a description of both electron and hole behavior is present, therefore the results are of a certain relevance for the theory of charge transport in semiconductors.
Investigation of electron mobility in GaAs‐based devices using genetic algorithm
Authors: Taheri Ali , Davoodi Mansoor , Setayeshi Saeed 
Published: February 2012

PurposeThe purpose of this work is to study the capability of heuristic algorithms like genetic algorithm to estimate the electron transport parameters of the Gallium Arsenide (GaAs). Also, the paper provides a simple but complete electron mobility model for the GaAs based on the genetic algorithm that can be suitable for use in simulation, optimization and design of GaAs‐based electronic and optoelectronic devices.Design/methodology/approachThe genetic algorithm as a powerful heuristic optimization technique is used to approximate the electron transport parameters during the model development.FindingsThe capability of the model to approximate the electron transport properties of Gallium Arsenide is tested using experimental and Monte Carlo data. Results show that the genetic algorithm based model can provide a reliable estimate of the electron mobility in Gallium Arsenide for a wide range of temperatures, concentrations and electric fields. Based on the obtained results, this paper shows that the genetic algorithm can be a useful tool for the estimation of the transport parameters of semiconductors.Originality/valueFor the first time, the genetic algorithm is used to calculate the electron transport parameters in Gallium Arsenide. A complete electron mobility model for a wide range of temperatures, doping concentrations, compensation ratios and electric fields is developed.
Time domain severity factor (TDSF)
Authors: Álvarez‐Mariño Casimiro , Lopez‐Fernandez Xose M. , Jacomo Ramos Antonio J.M. , Castro Lopes Ricardo A.F. , Miguel Duarte Couto José 
Published: February 2012

PurposeThis paper aims to present and define a factor to assess the severity supported along transformer windings when the transformer is subjected to a transient voltage waveform due a switching operation of a vacuum circuit breaker (VCB). This factor is identified as time domain severity factor (TDSF).Design/methodology/approachSince each of switching waveforms depend on the electrical interaction between transformer and the VCB, it implies that each of those combinations is characterized by a TDSF. To obtain the TDSF implies to manage two different models of the transformer under consideration. Firstly, a terminal model (black box model) of the transformer is built to compute the switching waveform at transformer terminals during VCB operation. Then, a detailed model (white box model) of the transformer is used to compute the internal transient voltage distribution along transformer windings.FindingsA practical application of a power system consisting of a real transformer connected to a VCB is performed to show the sensibility of the TDSF coefficient.Originality/valuePrevious works found in the literature already consider the evaluation of the overvoltages in transformer associated to switching transient by coefficients, such as the frequency domain severity factor (FDSF). But this factor, as a global coefficient, could not assess the severity along windings to localize dielectrically weak points. Therefore, this paper overcomes this limitation proposing an alternative coefficient identified as time domain severity factor (TDSF).