bluuebunny/crossref_metadata_2025_split huggingface dataset:
Library cooperation the Polish way: toward NUKAT and WorldCat in Poland
Authors: Hollender Henryk , Kasprzyk Agnieszka 
Published: September 2008

PurposeThe purpose of this paper is to discuss the development of library catalogs and the national union catalog in Poland and the inclusion of the latter in OCLC's WorldCat, bringing Polish cultural life from authors to researchers and composers to a worldwide audience.Design/methodology/approachTwo Polish librarians deeply involved in the liaison with OCLC over WorldCat discuss the development of library automation and catalogs in the country, in particular NUKAT, the national union catalog for academic and research libraries in Poland. The article also covers the inclusion of Polish library data in Google Scholar.FindingsThere is a wealth of Polish content now available via WorldCat – currently around 900,000 items are available.Practical implicationsMakes researchers aware of data on Polish publications that can now be found via OCLC's WorldCat and Google Scholar. Poland is one of Europe's major publishing countries, with around five per cent of Europe's publications a year.Originality/valueProvides an overview of the cataloguing situation in one of Eastern Europe's more recent member states of the European Union.
The current status and challenges of collaboration in library and information studies (LIS) education and training in Africa
Authors: Ocholla Dennis N. 
Published: September 2008

PurposeThe purpose of this paper is to discuss the current status and challenges of collaboration in library and information education and training in Africa.Design/methodology/approachThe paper largely draws examples from experiential knowledge and observation; basic bibliometric analysis; and studying related institutional documents as well as African studies in the domain.FindingsMost of the library and information studies (LIS) schools are based in Anglophone Africa and located within universities. Common trends of LIS education are shared by most LIS schools in Africa. Major challenges facing LIS education include the regulation of student numbers, knowledge and diversification of LIS job markets, funding of LIS schools, the development of technology infrastructures both in quantity and quality, allowing efficient access and the continued development of education through short courses that provide new knowledge, skills and attitudes to LIS workers. Collaboration of LIS schools in the region is weak and largely informal. There is hardly any research collaboration amongst LIS schools in Africa.Research limitations/implicationsOpportunities for collaboration that exist require initiatives, involvement and leadership. Organizing LIS schools workshops and pre/post conferences during national, regional and international conferences is an excellent way to begin unravelling a considerable portion of the current collaborative plight by engaging relevant stakeholders.Originality/valueThe paper raises primary challenges and opportunities for collaboration in LIS education and training in Africa thereby providing useful, current information that should inform LIS educators, researchers, students and other stakeholders on the status and challenges of collaboration in LIS education on the continent.
Succession planning in libraries
Authors: Topper Elisa F. 
Published: September 2008

PurposeThis article aims to draw attention to the fact that succession planning is crucial to libraries.Design/methodology/approachThe article is a literature review and commentary on the topic of succession planning in libraries.FindingsLibraries need to make succession planning a priority of human resource management.Originality/valueThe value of planning ahead is needed with the exodus of baby boomers.
Report from the 2008 BOBCATSSS symposium in Zadar, Croatia
Authors: Tallerås Kim 
Published: September 2008

PurposeThe purpose of this paper is to provide a flavour of the content of the BOBCATSSS Symposium, held in Zadar, Croatia, in January 2008.Design/methodology/approachA brief and subjective account of approaches to the main topics of this conference is the approach taken in the article.FindingsThe theme of the symposium, “Access to information for everyone” invited a variety of approaches that show the complexity regarding the future library institution and the future roles of the librarian. The conference included areas such as technological developments, e.g. Web 2.0 and e‐inclusion, digital rights management, open access, and the library as physical space.Originality/valueA brief report of value to library and information professionals regarding provision of access to information and the future of libraries and librarians.
Concentrated winding PM machines: a pre‐design approach
Authors: Abdennadher Imen , Masmoudi Ahmed , Elantably Ahmed 
Published: September 2008

PurposeThe purpose of this paper is to discuss the design of concentrated winding permanent magnet (PM) machines dedicated to propulsion applications considering both surface‐mounted and flux‐concentrating arrangements of the PMs.Design/methodology/approachFollowing the selection of a suitable distribution of the concentrated winding, a derivation of the machine inductances is carried out in order to highlight the increase in the flux‐weakening range gained through the substitution of distributed windings by concentrated ones. Then, mmf and finite element analysis are carried out in order to investigate the air gap flux density and the torque production capability of both surface‐mounted and flux‐concentrating PM machines.FindingsThe paper finds that, although both machines provide almost the same average torque, the surface‐mounted PM machine offers lower torque ripple with respect to the flux‐concentrating arrangement: a crucial benefit in electric and hybrid propulsion systems.Research limitations/implicationsThe research should be extended to the comparison of the obtained results related to the torque production capability with experimental measurements.Practical implicationsAn increase in the efficiency associated with the extension of the flux‐weakening range and a reduction of the volume make the concentrated winding PM machines interesting candidates, especially in large‐scale production applications such as the automotive industry.Originality/valueThe paper proposes an approach to design and performance investigation of concentrated winding PM machines considering both surface‐mounted and flux‐concentrating arrangements of the PMs.
Magnetic equivalent circuit model of a hybrid excitation synchronous machine
Authors: Hlioui S. , Vido L. , Amara Y. , Gabsi M. , Miraoui A. , Lécrivain M. 
Published: September 2008

PurposeThe purpose of this paper is to present an analytical modeling based on lumped parameter magnetic circuits of a hybrid excitation synchronous machine. The model is first established and compared with 3D finite elements analysis and measurements. It is then used to optimise hybrid excitation effectiveness.Design/methodology/approachThe machine studied, which has a 3D structure, requires the use of 3D finite elements method. The 3D FEA tool is still time‐consuming, which limits its use in optimal design process. To overcome this limitation the paper investigates an analytical modeling based on lumped parameter magnetic circuits. The developed model is then used in an optimisation procedure.FindingsThe machine presented has an original structure. It has been subject to a patent protection. The operating principle of this structure has been presented and optimisation of hybrid excitation effectiveness has been investigated. Double excitation allows one to control air gap flux while reducing permanent magnets' demagnetisation risk.Originality/valueThe paper presents an original structure with true field regulation capability. The principle of operation has been presented. A prototype has been built and tested. The paper also presents a 3D finite elements analysis of this machine and an analytical modelling.
Reluctant network‐based investigation of a claw pole alternator with DC excitation in the stator
Authors: Aloui Helmi , Ibala Amina , Masmoudi Ahmed , Gabsi Mohamed , Lécrivain Michel 
Published: September 2008

PurposeThe purpose of this paper is to propose improvement of the generation capability of a claw pole alternator with DC excitation in the stator (CPAES) using analytical investigation based on a dedicated reluctant model.Design/methodology/approachThe paper analyzes the effects of geometry and material transformations of the magnetic circuit on the generation capability of the CPAES as well as the reduction of claw‐claw leakage flux by inserting permanent magnets in between adjacent claws.FindingsThe generation capability could be improved considering the proposed geometry and material changes of the magnetic circuit of the CPAES. The inclusion of permanent magnets in between adjacent claws offers an increase of the alternator generation due to the reduction of the claw‐claw leakage flux.Research limitations/implicationsThe research should be extended by building a new prototype of the CPAES in order to compare analytical results and experimental ones.Practical implicationsA new concept with no brush‐ring for excitation and an improvement of the generation capability of the alternator make the CPAES an interesting candidate especially in large‐scale production applications such as the automotive industry.Originality/valueThe paper proposes a new alternator topology called claw pole alternator with DC excitation in the stator (CPAES) and an analytical approach to improve the generation capability of such a concept, which represents a crucial challenge in electric generation systems especially in automotive applications.
Acoustic noise of electromagnetic origin in a fractional‐slot induction machine
Authors: Le Besnerais Jean , Lanfranchi Vincent , Hecquet Michel , Brochet Pascal , Friedrich Guy 
Published: September 2008

PurposeThe purpose of this paper is to apply a fast analytical model of the acoustic behaviour of pulse‐width modulation (PWM) controlled induction machines to a fractional‐slot winding machine, and to analytically clarify the interaction between space harmonics and time harmonics in audible electromagnetic noise spectrum.Design/methodology/approachA multilayer single‐phase equivalent circuit calculates the stator and rotor currents. Air‐gap radial flux density, which is supposed to be the only source of acoustic noise, is then computed with winding functions formalism. Mechanical and acoustic models are based on a 2D ring stator model. A method to analytically derive the orders and frequencies of most important vibration lines is detailed. The results are totally independent of the supply strategy and winding type of the machine. Some variable‐speed simulations and tests are run on a 700 W fractional‐slot induction machine in sinusoidal case as a first validation of theoretical results.FindingsThe influence of both winding space harmonics and PWM time harmonics on noise spectrum is exposed. Most dangerous orders and frequencies expressions are demonstrated in sinusoidal and PWM cases. For traditional integral windings, it is shown that vibration orders are necessarily even. When the stator slot number is not even, which is the case for fractional windings, some odd order deflections appear: the radial electromagnetic power can therefore dissipate as vibrations through all stator deformation modes, leading to a potentially lower noise level at resonance.Research limitations/implicationsThe analytical research does not consider saturation and eccentricity harmonics which can play a significant role in noise radiation.Practical implicationsThe analytical model and theoretical results presented help in designing low‐noise induction machines, and diagnosing noise or vibration problems.Originality/valueThe paper details a fully analytical acoustic and electromagnetic model of a PWM fed induction machine, and demonstrate the theoretical expression of main noise spectrum lines combining both time and space harmonics. For the first time, a direct comparison between simulated and experimental vibration spectra is made.
Acoustic noise emitted by passive components in magnetic devices and design of a low‐noise industrial inductor
Authors: Barre Olivier , Napame Bellemain , Hecquet Michel , Brochet Pascal 
Published: September 2008

PurposeThe purpose of this paper is to present the original study of an industrial device. Industrial inductors are used to decrease the current variations, resulting from the use of modern power converters. To reduce these variations, the magnetic energy stored in these components is automatically used when the receptor is unconnected to the principal sources. Such storage is generally obtained by using a magnetic circuit containing air‐gaps. The rigidity of this circuit, associated with the magnetic stresses which appear in these areas, causes the structure to produce mechanical vibration and to emit audible sounds.Design/methodology/approachExperiments, simulations and test devices are used to determine the main physical phenomenon that generates the undesirable audible noise. The resulting knowledge is used to design a quieter device.FindingsThe mechanical vibrations and emitted noises are attached to magnetic effects. Even if it is not possible to suppress all these effects, the level of sound emitted can be decreased through a suitable design of the magnetic core.Originality/valueIndustrial inductors are usually built and designed using methods coming from the transformer studies. A new concept for the design of the magnetic core is presented. Experimental approaches and numerical simulations are performed in order to highlight the physical behaviours of the coils and their magnetic coupling to the magnetic core. It appears that breaking the magnetic core into free parts is an original solution that decreases the emitted noise.
A microcontroller‐based soft‐starter for residential air‐conditioners: harmonic analysis
Authors: El Ferik S. , Ahmed C.B. , Ben Amor L. , Hussain S.A. 
Published: September 2008

PurposeThe purpose of this paper is to reduce the inrush current and dip in voltage for energy‐ saving purposes in relation to residential air‐conditioning systems.Design/methodology/approachThe paper focuses on the experimental harmonic investigation of a window‐type residential AC unit line current under time‐based soft‐starting control strategy. The control strategy assumes that only source voltage and current measurements are available. The soft‐starter is based on power electronic devices controlled through a firing signal generated by a programmed microcontroller during the first 500 ms.FindingsThe harmonic content shows the effect of the soft‐starter in exciting high‐frequency components of the line current. Harmonics investigations show that the high frequencies – even or odd multiples – of the fundamental line frequency are all excited by the soft‐starter approach. Some of these frequencies may harm the life cycle of the air‐conditioner.Research limitations/implicationsThe real data harmonic analysis shows that the adopted approach excites the entire frequency spectrum of the signal. A better monitoring of the harmonics is required. A closed loop adaptive soft‐starting control may perform much better than a time‐based soft‐starting strategy.Originality/valueThe paper assesses the power quality related to time‐based soft‐starting strategy of a residential air‐conditioning system to reduce the inrush current and the dip in voltage, both with a serious effect on energy savings, especially when the AC load is around 65 per cent of the total power demand load.
A DTC strategy dedicated to three‐switch three‐phase inverter‐fed induction motor drives
Authors: Ben Rhouma Asma , Masmoudi Ahmed 
Published: September 2008

PurposeThe purpose of this paper is to describe the implementation of a direct torque control strategy dedicated to three‐switch three‐phase delta‐shaped inverter (TSTPI) fed induction motor drives as well as the comparison of its performance with those yielded by six‐switch three‐phase inverter (SSTPI) fed induction motor drives under the Takahashi DTC strategy.Design/methodology/approachReferring to the asymmetrical stator voltage vectors and in order to reach high dynamic with low ripple of the electromagnetic torque response, the design of the vector selection table should include virtual voltage vectors by the subdivision of each sector into two equal sub‐sectors.FindingsIt has been shown that the implementation of the proposed DTC strategy in TSTPI‐fed induction motor drives leads to higher transient behaviour and better steady‐state features than those exhibited by the Takahashi DTC strategy implemented in SSTPI‐fed induction motor drives.Research limitations/implicationsThe research should be extended to a comparison of the obtained simulation results with experimental measurements.Practical implicationsA 50 per cent reduction of cost and compactness associated with a 50 per cent increase of reliability makes the TSTPI an interesting candidate, especially in large‐scale production applications such as the automotive industry.Originality/valueThe paper proposes an approach to improve the cost‐effectiveness, the compactness and the reliability of TSTPI‐fed induction motor drives, which represents a crucial benefit in electric and hybrid propulsion systems.
Modelling and control of cascaded multilevel converters for dynamic compensation
Authors: Jaafar Imen , Ben Ammar Faouzi , Elleuch Mohammed 
Published: September 2008

PurposeThis paper aims to integrate cascaded multilevel converters in the static compensator (STATCOM) systems in order to assure dynamic compensation of the reactive power absorbed by fixed speed wind turbines.Design/methodology/approachThe cascaded multilevel converter topology is incorporated as a variable source of reactive power required by the wind farm. The evaluation of reference reactive currents is assured by the technique of instantaneous power theory. Thus, the STATCOM, with its appropriate control strategy, continuously compensates the reactive currents.FindingsA developed non‐linear state representation makes possible the analysis of static and dynamic behaviour of the proposed system. The STATCOM‐based cascaded multilevel converter is able to provide continuous compensation and proves highly dynamic under steady state and transient operating conditions.Practical implicationsThe paper formulates a mathematical model which includes all parameters describing the system composed by a medium voltage network, a wind farm and a STATCOM‐based cascaded multilevel converter. The study may help to develop new control methods of such power systems containing non‐linearities and an extended number of parameters.Originality/valueSince there are few studies on comprehensive and complete models of power systems, the paper contributes to make both a study and a simulation based on a developed non‐linear state model which perfectly describes the state and transient behaviour of the proposed system.
Theory of the adjustable speed generation systems
Authors: Koczara Wlodzimierz , Chlodnicki Zdzislaw , Ernest Emil , Krasnodebski Artur , Seliga Robert , Brown Neil L. , Kaminski Bartlomiej , Al‐Tayie Jawad 
Published: September 2008

PurposeThe purpose of this paper is to provide a new theory of adjustable speed decoupled generation which has the potential to challenge existing coupled generation based on a classical synchronous generator operating with fixed speed.Design/methodology/approachThe paper's approach is a theoretical consideration of the drawbacks of conventional fixed speed generation based on a synchronous generator and proposal of problem solutions by the introduction of a decoupled generation system with additional degree of freedom. Computer calculations are used as design and for preliminary verification. Tests in a real laboratory system equipped with modern components such as electrical machines and power electronic converters proved the theory.FindingsDecoupled generation is realized in a very original way using new blocks, integration method and control. The developed system has been awarded more than six world patents. The system has additional degrees of freedom in speed and grid connection operation.Originality/valueThe research team has concentrated its research over many years and developed a generation system which has been awarded a great number of patents. A special axial flux, light and simple permanent magnet generator was developed and integrated to the prime mover. A three‐phase AC/AC power electronic converter and a DSP controller are integrated to a very small size and low weight. The invented topology provides a very reliable operation, high‐quality AC voltage in fully three‐phase non‐symmetrical load. There were also presentations on world conferences (EPE, PESC, EPE‐PEMC).
An efficient approach to detect and classify power quality disturbances
Authors: Radil Tomáš , Janeiro Fernando M. , Ramos Pedro M. , Cruz Serra A. 
Published: September 2008

PurposeThe purpose of this paper is to develop a new method for detection and classification of power quality disturbances such as transients, waveform distortions, sags, swells and interruptions.Design/methodology/approachFor the purposes of the proposed method, the power quality disturbances are divided into two groups. Different algorithms are applied to detect and classify the disturbances from each of the two groups. For the processing of transients and waveform distortions, digital high‐pass filter and the mathematical morphology closing are used. Calculation of the RMS value is used for detection of sags, swells and interruptions.FindingsThe proposed method was implemented in a PC‐based measuring setup. The measuring setup was used in a seven‐months‐long monitoring of a single‐phase power system. In the course of the monitoring, the proposed method was verified on over 19,000 transients, 3,500 waveform distortions, 77 sags and 18 interruptions.Research limitations/implicationsThe classification stage of the proposed method does not differentiate between individual types of waveform distortions (harmonics, interharmonics, noise…).Practical implicationsThe described approach is simpler and more reliable than, for example, methods based solely on wavelet transform. The proposed method is suitable for real‐time monitoring of power systems.Originality/valueThe paper describes a new and efficient way of detection and classification of disturbances (especially of transients and waveform distortions). It shows that mathematical morphology operations, which are normally used in image processing, represent a useful tool also in the field of power quality measurements.
New reactive power sources dispatch applied to the IEEE 57 nodes
Authors: Belazzoug Messaoud , Boudour Mohamed , Hellal Abdelhafid 
Published: September 2008

PurposeThe purpose of this paper is to deal with a new dispatching and optimization of reactive power sources in power systems.Design/methodology/approachThe methodology is first based on an optimal movement of existing reactive sources as a first phase, then an optimal investment in a second phase and finally a combination of the two previous phases as the third one. The methodology showed also the advantage of a two‐levels procedure, considering an initial minimal compensation before minimizing the active losses. The solution of the global non‐linear problem is performed using the projected and augmented Lagrange method associated with the reduced gradient and the DFP methods.FindingsIn waiting for new investment programs which are planned for limited periods, the study presents an alternative of optimizing the reactive power compensation by a movement of the power sources or some of them, satisfying all system constraints and minimizing also the active power losses.Originality/valueThe planners and operators are able to decide what cases are to be considered for reactive power dispatch; the proposed program gives a proposal solution to almost all changes that can occur to the power system (incident, contingency, load variation, development).