A space charge motion simulation with FDTD method and application in negative corona electrostatic field analysis

In this paper, a finite difference time domain based simulation method is presented for the spatio-temporal analysis of space charge motion and the proposed method is applied to negative corona electrostatic field analysis. Drifting and diffusion motion equations of space charges are numerically solved and used in the simulation of corona discharges considering effects of impact ionization, electron attachment, ion–ion recombination and ion–electron recombination. The results obtained from the simulation are discussed

A note on applications of time-domain solution of Cole permittivity models

The complex dielectric permittivity is an important parameter for characterization of electrical properties of dielectric materials. Experimental studies demonstrated that Cole models of dielectric permittivity can provide a better fitting to the experimental data because of allowing for fractional-order frequency dependence. This study aims to investigate physical interpretation of time domain solutions of Cole permittivity models. For this purpose, impulse responses of Cole-Cole model and Davidson-Cole model are expressed in Mittag-Leffler function form by using inverse Laplace transform. The impulse responses of these models are decomposed into impulsive and dispersive components, and the relations of these components with relaxation mechanism of dielectric materials are discussed. By considering impulse response solution of Cole-Cole models, a fractional order dynamic capacitance model is introduced for time domain equivalent circuit modeling of dielectric materials. Moreover, transient properties of electromagnetic wave penetration to dielectric materials are analyzed according to impulse response solution of Cole-Cole model. To illustrate applications of proposed time domain permittivity solutions, the Cole-Cole model of ethyl-acetate liquids was also studied and results are presented. (C) 2017 Elsevier GmbH. All rights reserved

Spinal fractures as an indicator of concurrent other system injuries: An analysis of 242 cases.

WOS: 000396822900003Introduction: The aim of the present study was to examine any non spinal tissue injuries accompanying spinal fractures in an attempt to determine if spinal fractures are an indicator of the presence, severity, and prognosis of concomitant organ/tissue injuries in two trauma center in Turkey. Methods: This study had a retrospective cross-sectional design that incorporated the information of the patients presenting to the emergency services of two level 1 trauma centres in the Central Anatolian Region of Turkey between January 2010 and December 2012. Among 242 spinal fracture patients, 98 (41.9%) had accompanying injuries in other regions. Results There was a statistically significant correlation between the accompanying injuries and the single Powered by Editorial Manager (R) and ProduXion Manager (R) from Aries Systems Corporation level spinal fractures, the anatomical localization of the spinal fracture (p=0.012, p=0.048). Accompanying injuries associated with Lumbar Spinal Associated Injury (LSAI) were the most common (n=54, 55%) while Servical Spinal Associated Injury (SSAI) were the least common (n=7, 7.14%). Conclusion: Every patient presenting to emergency department after a high-energy trauma should be regarded as vertebral fracture sunless proven otherwise, and any spine fractures should be taken serious with regard to potential internal organ injuries

Clinical Features and Outcomes of Patients with Granulomatosis with Polyangiitis and Review of Literature

Objective: Granulomatosis with polyangiitis (GPA) is a type of antineutrophil cytoplasm antibody-associated vasculitis. This study aimed to investigate the clinical and laboratory findings of patients with GPA and to determine which factors were associated with poor prognosis and renal outcome