bluuebunny/crossref_metadata_2025_split huggingface dataset:
Modeling of spatial uncertainties in the magnetic reluctivity
Authors: Jankoski Radoslav , Römer Ulrich , Schöps Sebastian 
Published: May 2017

Purpose
The purpose of this paper is to present a computationally efficient approach for the stochastic modeling of an inhomogeneous reluctivity of magnetic materials. These materials can be part of electrical machines such as a single-phase transformer (a benchmark example that is considered in this paper). The approach is based on the Karhunen–Loève expansion (KLE). The stochastic model is further used to study the statistics of the self-inductance of the primary coil as a quantity of interest (QoI).

Design/methodology/approach
The computation of the KLE requires solving a generalized eigenvalue problem with dense matrices. The eigenvalues and the eigenfunction are computed by using the Lanczos method that needs only matrix vector multiplications. The complexity of performing matrix vector multiplications with dense matrices is reduced by using hierarchical matrices.

Findings
The suggested approach is used to study the impact of the spatial variability in the magnetic reluctivity on the QoI. The statistics of this parameter are influenced by the correlation lengths of the random reluctivity. Both, the mean value and the standard deviation increase as the correlation length of the random reluctivity increases.

Originality/value
The KLE, computed by using hierarchical matrices, is used for uncertainty quantification of low frequency electrical machines as a computationally efficient approach in terms of memory requirement, as well as computation time.
Synergic calculation method of voltage stability L indicator for multi-area power network
Authors: Zhang Anan , Zhang Fan , Li Zhi , Li Qian , Zhang Xuliang , Wang Jing 
Published: May 2017

Purpose
With the growing scale of power grids, integrated power grids often contain multiple areas. When the control centre of each regional grid conducts an assessment of local voltage stability, the calculation is always based on the local regional power grid model. However, less consideration is given to a detailed model of the entire network, which may lead to a large calculation error. Under the premise of ensuring the data and information security of Supervisory Control and Data Acquisition between different regional power grid operation control centres, the purpose of this paper is to reduce calculation error simply by using the data of a local power network.

Design/methodology/approach
According to the calculation methodology of “decomposition and coordination” and the power balance equation of an interconnected power grid, an improved radial equivalent independent (REI) equivalent method, which can reflect the dynamic characteristics of interconnected power grids to a certain extent, is proposed in this paper. A mathematical model of multi-area-grid L indicator synergic computing is derived as well.

Findings
With the calculation of Institute of Electrical and Electronics Engineers (IEEE) standard grids and an actual grid model, it is proven that the method proposed in this paper can significantly improve the accuracy of the regional power grid L indicator calculation and achieve the synergic computing of a multi-area power system L indicator, without an increase in data interaction among the regional power grids.

Originality/value
The indicator of voltage stability among multi-area was obtained by using the improved REI equivalent method with the change of the load participation factor. Particularly, the coordinated calculation method can be implemented on a local power grid without knowledge of all the parameters of its interconnection, which can avoid possible leakage of confidential data and information of the system owners.
Successive-over-relaxation based recursive Bayesian approach for power system configuration identification
Authors: Ahmad Fiaz , Rasool Akhtar , Ozsoy Esref Emre , Sabanoviç Asif , Elitas Meltem 
Published: May 2017

Purpose
The purpose of this paper is to propose successive-over-relaxation (SOR) based recursive Bayesian approach (RBA) for the configuration identification of a Power System. Moreover, to present a comparison between the proposed method and existing RBA approaches regarding convergence speed and robustness.

Design/methodology/approach
Swift power network configuration identification is important for adopting the smart grid features like power system automation. In this work, a new SOR-based numerical approach is adopted to increase the convergence speed of the existing RBA algorithm and at the same time maintaining robustness against noise. Existing RBA and SOR-RBA are tested on IEEE 6 bus, IEEE 14 bus networks and 48 bus Danish Medium Voltage distribution network in the MATLAB R2014b environment and a comparative analysis is presented.

Findings
The comparison of existing RBA and proposed SOR-RBA is performed, which reveals that the latter has good convergence speed compared to the former RBA algorithms. Moreover, it is robust against bad data and noise.

Originality value
Existing RBA techniques have slow convergence and are also prone to measurement noise. Their convergence speed is effected by noisy measurements. In this paper, an attempt has been made to enhance convergence speed of the new identification algorithm while keeping its numerical stability and robustness during noisy measurement conditions. This work is novel and has drastic improvement in the convergence speed and robustness of the former RBA algorithms.
Unified integro-differential equation for efficient dispersive FDTD simulations
Authors: Ramadan Omar 
Published: May 2017

Purpose
The purpose of this paper is to derive a unified formulation for incorporating different dispersive models into the explicit and implicit finite difference time domain (FDTD) simulations.

Design/methodology/approach
In this paper, dispersive integro-differential equation (IDE) FDTD formulation is presented. The resultant IDE is written in the discrete time domain by applying the trapezoidal recursive convolution and central finite differences schemes. In addition, unconditionally stable implicit split-step (SS) FDTD implementation is also discussed.

Findings
It is found that the time step stability limit of the explicit IDE-FDTD formulation maintains the conventional Courant–Friedrichs–Lewy (CFL) constraint but with additional stability limits related to the dispersive model parameters. In addition, the CFL stability limit can be removed by incorporating the implicit SS scheme into the IDE-FDTD formulation, but this is traded for degradation in the accuracy of the formulation.

Research limitations/implications
The stability of the explicit FDTD scheme is bounded not only by the CFL limit but also by additional condition related to the dispersive material parameters. In addition, it is observed that implicit JE-IDE FDTD implementation decreases as the time step exceeds the CFL limit.

Practical implications
Based on the presented formulation, a single dispersive FDTD code can be written for implementing different dispersive models such as Debye, Drude, Lorentz, critical point and the quadratic complex rational function.

Originality/value
The proposed formulation not only unifies the FDTD implementation of the frequently used dispersive models with the minimal storage requirements but also can be incorporated with the implicit SS scheme to remove the CFL time step stability constraint.
Resistive torque in permanent magnet couplings operating through a conductive wall
Authors: Rezek Matsumoto Thomas , Chabu Ivan 
Published: May 2017

Purpose
The purpose of this paper is to propose an analytical approach to determine the resistive torque caused by a conductive wall between the rotors of axial permanent magnet couplings. In this configuration, relative motion between the coupling rotors and the wall generates a resistive torque that is a consequence of the induced eddy currents in this barrier. Therefore, such induced resistive torque implies a reduction in the permanent magnet coupling performance, that is, its torque transmission capacity.

Design/methodology/approach
The developed resistive torque analytical formulation was based on eddy-current brakes of previous studies. To validate the proposed method, tests were conducted in a prototype and results were compared with analytical ones.

Findings
The analytical method showed a good correlation with the experiment data. Furthermore, a major degradation of the coupling capability to transmit torque was found because of the conductive wall presence, enhancing the importance of predicting such phenomenon when designing these devices.

Originality/value
A novel direct assessment of the resistive torque while in motion is presented in this paper. These measurements were of great importance to accurately compare the analytical and experimental data.
Design and implementation of piezoelectric energy harvesting circuit
Authors: Savarimuthu Kirubaveni , Sankararajan Radha , Murugesan Sudha 
Published: May 2017

Purpose
The purpose of this paper is to present the design of a piezoelectric vibration energy generator with a power conditioning circuit to power a wireless sensor node. Frequency and voltage characterization of the piezoelectric energy harvester is performed. A single-stage AC–DC power converter that integrates the rectification and boosting circuit is designed, simulated and implemented in hardware.

Design/methodology/approach
The designed power conditioning circuit incorporates bridgeless boost rectification, a lithium ion battery as an energy storage unit and voltage regulation to extract maximum power from PZT-5H and to attain higher efficiency. The sensor node is modelled in active and sleep states on the basis of the power consumption. Dynamic modelling of the lithium ion battery with its state of charging and discharging is analysed.

Findings
The test result shows that the energy harvester produces a maximum power of 65.9 mW at the resonant frequency of 21.4 Hz. The designed circuit will operate even at a minimum input voltage of 0.5 V. The output from the harvester is rectified, boosted to a 7-V DC output and regulated to 3.3 V to the power C_Mote wireless sensor node. The conversion efficiency of the circuit is improved to 70.03 per cent with a reduced loss of 19.76 mW.

Originality/value
The performance of the energy harvester and the single-stage power conditioning circuit is analysed. Further, the design and implementation of the proposed circuit lead to an improved conversion efficiency of 70.03 per cent with a reduced loss of 19.76 mW. The vibration energy harvester is integrated with a power conditioning circuit to power a wireless sensor node C_Mote. The piezoelectric vibration energy harvester is implemented in real time to power C_Mote.
Foreign player migration and athletic success in Greek football
Authors: Travlos Antonios K. , Dimitropoulos Panagiotis , Panagiotopoulos Stylianos 
Published: May 2017

PurposeThe purpose of this paper is to examine the migration of foreign football players that participated in the elite football championship in Greece and the impact of this migratory channel on the athletic success of the football clubs.Design/methodology/approachThe study analyzed a database of all migrant and local athletes that participated in the professional Greek football championship over the period 2001-2013 and performed descriptive and regression analyses.FindingsThe regression analyses revealed a positive and significant statistical relation between the investment in foreign talents and the position of the clubs in the championship; however, this impact was more intense for foreign athletes after the formation of the Greek Super League (SL) in 2007 but on the contrary native athletes seem to contribute less to the athletic success than their foreign counterparts.Practical implicationsThe findings indicated that valuable resources where spent after SL formation for the acquisition of foreign well-trained athletes. Therefore, this study corroborated arguments in previous research that a basic reason for foreign player migration in football is the increased revenues accrued from the media and sponsors. The study also provided useful policy implications for football managers for improving their decisions on this matter.Originality/valueThe present study fills a gap in the empirical literature and contributes significantly on the ongoing debate about the international athletes’ migration and its impact on athletic success.
Some physicochemical properties and mineral contents of stirred yoghurts containing different fruit marmalades
Authors: Temiz Hasan , Tarakçı Zekai , Yarilgaç Tarik , Dağ Beşir 
Published: May 2017

In this study chemical properties and mineral levels of yoghurts containing different fruit marmalades were investigated. Cherry laurel, loquat fruit and kiwi marmalade were used to make the stirred yoghurts, and the calcium, phosphorus, sodium, magnesium, manganese, iron, zinc, copper, boron, lead, nickel, molybdenum, chromium, cadmium, cobalt levels were determined by an inductively coupled plasma optical emission spectrometer (ICP–OES). The total solid, fat, ash, pH, viscosity and syneresis contents of the yoghurt samples changed between 13.85–21.02%, 2.45–2.90%, 0.82–0.94%, 4.11–4.22, 2104–2454 cP and 42.0–47.0 mL/100 g, respectively. The mean concentrations in the yoghurts of these minerals were 104.66–118.94 calcium, 95.81–112.42 phosphorus and 13.47–15.04 magnesium as mg/100 g, 235.00–254.00 iron, 429.00–453.00 zinc and 70.45–122.90 copper as μg/100 g. The recommended dietary allowance (RDA) was calculated on the basis of the intake of one yoghurt portion (125 g).
Improving patient safety: The impact of an outpatients' electronic handover system in a tertiary dermatology department
Authors: Poon Flora , Martyres Raymond , Denahy Anthony , Varigos George 
Published: May 2017

AbstractBackground/ObjectivesElectronic medical records (EMR) can improve quality healthcare, patient safety and streamline workflow to improve efficiency of a department. Despite the known benefits and difficulties of EMR systems, there is limited data on the impact and definable effectiveness it can have within a dermatology unit. We present an outpatients' EMR known as an electronic handover system (EHS) from its inception, delivery and audit of its use in evaluating the true impact.MethodsAn audit of the EHS was conducted from 1 March to 31 August 2014. Quantitative data evaluating the type of jobs entered and completed, overdue tasks, patient workload and phone consultations were conducted. Qualitative data was assessed via a pilot survey assessing users' perspectives of the EHS evaluating communication, clinician‐patient relationship and administrative tasks.ResultsAltogether 754 jobs were entered for 411 dermatology outpatients using the EHS. Most tasks concerned following up bloods and swabs (38%) or biopsies (36%). Overall, 51 jobs were not completed by the specified due dates and 188 phone consultations were performed. Compared with pre‐EHS data, clinic review patients fell by 16%, with a modest increase (2%) in the number of new patients seen. The survey results show that most respondents believed that EHS improved communication, did not affect the clinician–patient relationship and they were more confident in their practice knowing there was a recording system for follow up.ConclusionThe dermatology EHS has provided a reliable system for following up all outpatient results. The potential benefits range from clinical, organisational and health research, which, from our experience, demonstrates improved patient follow‐up care.
Inflammatory bowel disease is presenting sooner after immigration in more recent US immigrants from Cuba
Authors: Damas O. M. , Avalos D. J. , Palacio A. M. , Gomez L. , Quintero M. A. , Deshpande A. R. , Sussman D. A. , McCauley J. L. , Lopez J. , Schwartz S. J. , Abreu M. T. 
Published: May 2017

SummaryBackgroundDespite a rising incidence of inflammatory bowel disease (IBD) in Hispanics in the United States, there are no studies examining the relationship between immigrant generation and IBD onset among Hispanics.AimsTo determine whether age of IBD diagnosis, time from immigration to IBD diagnosis and IBD phenotype, differed across immigration periods in South Florida Cuban immigrants.MethodsThis was a cohort of consecutively identified Cuban‐born adults who developed IBD in the United States and were followed in gastroenterology (GI) clinic. We divided time cohorts of immigration by historical relevance: before 1980, 1980‐1994 and 1995‐to‐present. We examined differences across time cohorts in diagnosis age, time from immigration to IBD diagnosis, and IBD phenotype (ie, IBD type, disease location).ResultsA total of 130 Cuban patients with IBD were included. Age of IBD diagnosis was older in Cubans arriving before 1980 than in those arriving between 1980‐1994 or after 1995 (44.7 vs 33.79 and 33.71, respectively, P<.0001). Time between immigration and diagnosis was shorter in patients arriving to the US after 1980 (31.77 years, Standard deviation (SD) 12.83 (<1980) vs 17.13 years, SD 8.55 (1980‐1994) and 8.30 years, SD 4.72 (1995‐to‐present). IBD phenotype, including type of IBD, disease location and surgeries, did not differ significantly across time cohorts.ConclusionsOur study describes changing patterns of IBD onset following immigration in Cubans, suggesting that environmental changes either in the United States, Cuba or both are resulting in faster IBD onset in younger immigrant generations. These studies can inform the search for environmental triggers that may result in IBD.
Dual en bloc technique for adult renal transplantation
Authors: Tran Kim Chi , Li David , Taqi Ali , Sener Alp , McAlister Vivian C. , Luke Patrick P. 
Published: May 2017

AbstractIntroductionWe describe and provide follow‐up for a novel simplified technique permitting dual en bloc (DEB) transplantation of adult organs using single in situ arterial and venous anastomoses.MethodsTwenty‐two adult DEB transplants were performed at our center between 2001 and 2012, utilizing 44 kidneys en bloc. Results were compared with 20 solitary transplants from expanded criteria donors (ECD) associated with lower terminal serum creatinines and Remuzzi biopsy scores vs DEB group. Adult DEB implants had donor inferior vena cava connected to recipient external iliac vein and “Y” arterial interposition graft anastomosed to the recipient iliac artery. Ureters were conjoined prior to implantation as a single patch into the recipient bladder.ResultsMean operative time was 206±57 minutes in DEB vs 180±30 minutes in single transplants (P<.05). Delayed graft function rate was 23% vs 25% in both groups. At 12‐month follow‐up, mean serum creatinine was 152±66 μmol/L vs in 154±52 μmol/L DEB and single kidney transplant recipients, respectively (P=NS). Three‐year overall and graft specific survival were 86% and 84% in the DEB group, respectively (P=NS). Complication rates were similar between groups.ConclusionsThis DEB renal transplantation technique is safe and effective in adults. By employing techniques used to conjoin organ vasculature ex vivo, the number of in situ anastomoses is reduced, thereby minimizing operative ischemic time and potential for complications associated with extensive vascular dissection.
Characteristics associated with non‐disclosure of Type 2 diabetes at work
Authors: Olesen K. , Cleal B. , Skinner T. , Willaing I. 
Published: May 2017

AbstractAimTo explore factors associated with non‐disclosure of Type 2 diabetes to employers among Danish workers with Type 2 diabetes.MethodsA total of 705 workers with Type 2 diabetes completed a Danish cross‐sectional survey. Logistic regression models were used to estimate the associations between background characteristics and probability of non‐disclosure of diabetes to the employer. The models were mutually adjusted for background characteristics, socioeconomic‐, diabetes‐ and work‐related factors.ResultsAmong the participants, 23% had not disclosed their Type 2 diabetes to their current employer. Non‐disclosure was associated with more sickness absence, more years with diabetes, greater use of diabetic medication, higher educational level and a perception of not being respected by superior. Personal traits such as gender, age and well‐being were not associated with disclosure.ConclusionsAmong the feasible targets for interventions, good psychosocial work environment was associated with disclosure.
Water diversion reduces abundance and survival of two Mediterranean cyprinids
Authors: Merciai Roberto , Bailey Larissa L. , Bestgen Kevin R. , Fausch Kurt D. , Zamora Lluís , Sabater Sergi , García‐Berthou Emili 
Published: May 2017

AbstractWater flow is a fundamental characteristic required for the ecological integrity of stream ecosystems. However, populations of many freshwater fishes in the Mediterranean region are threatened by man‐induced drought due to water diversion. Mark‐recapture methodology is an effective tool for estimating fish abundance and survival probability, but it has been seldom used with Mediterranean freshwater fish. We tagged over 2,400 individuals of two threatened cyprinids (Mediterranean barbel Barbus meridionalis and Catalan chub Squalius laietanus) inhabiting an Iberian stream affected by water diversion, and used mark‐recapture methods to evaluate the effects of flow, temperature and depth on their apparent survival and abundance at hydrologically altered and perennial reaches. Based on estimates over the summer drying season, survival of Mediterranean barbel was more than six times higher in an upstream reach with permanent flow than a middle reach impacted by water diversion. Water depth was the most important habitat feature accounting for differences in survival, with both barbel and chub exhibiting higher survival and abundance at permanent sites farther downstream where flow had been restored and in an unaltered tributary. Our results show clear negative impacts of water diversion on fish populations. Both species, but particularly barbel, have life‐cycle characteristics that may allow populations to recover quickly if natural streamflow was restored by conserving water and reducing water diversion.
Growth and physiological responses of Quercus brantii seedlings inoculated with Biscogniauxia mediterranea and Obolarina persica under drought stress
Authors: Ghanbary E. , Tabari Kouchaksaraei M. , Mirabolfathy M. , Modarres Sanavi S. A. M. , Rahaie M. 
Published: May 2017

SummaryCharcoal canker of oak is a common disease in the western regions of Iran, which has widely spread due to climate change and increasing drought in recent years. Biscogniauxia mediterranea and Obolarina persica are known as two agents of oak charcoal canker in Zagros forests causing the dieback of oak trees. The effects of charcoal disease agent pathogens on the growth and physiological response of two‐year‐old seedlings of Quercus brantii were evaluated under drought stress in greenhouse over a period of nine months. Survival was 21.7% lower in seedlings inoculated with B. mediterranea subjected to drought stress compared with control treatment. The length of lesions on stems was 68% more under charcoal pathogens in drought stressed compared with the length of lesions caused by charcoal pathogens only. On the other hand, stem lesion length caused by B. mediterranea was 25% greater than those caused by O. persica. Some morphophysiological characteristics were affected by charcoal pathogens alone and/or in combination with drought. Diameter, height and biomass decreased the most in seedlings inoculated with charcoal pathogens under drought stress. Pathogenic agents alone and in combination with drought stress reduced photosynthetic rates, stomatal conductance, transpiration, the maximum Rubisco activity (Vcmax), maximum photochemical efficiency of photosystem II (Fv/Fm) and xylem water potential. In general, drought increased the aggressiveness of fungus and intensification of their destructive effects in Quercus brantii. Moreover, there was no significant difference between the effect of B. mediterranea and O. persica on the morphophysiological parameters studied.