Frequency-tunable metamaterials using broadside-coupled split ring resonators

We present frequency tunable metamaterial designs at terahertz (THz) frequencies using broadside-coupled split ring resonator (BC-SRR) arrays. Frequency tuning, arising from changes in near field coupling, is obtained by in-plane horizontal or vertical displacements of the two SRR layers. For electrical excitation, the resonance frequency continuously redshifts as a function of displacement. The maximum frequency shift occurs for displacement of half a unit cell, with vertical displacement resulting in a shift of 663 GHz (51% of f0) and horizontal displacement yielding a shift of 270 GHz (20% of f0). We also discuss the significant differences in tuning that arise for electrical excitation in comparison to magnetic excitation of BC-SRRs

Measurements of Radiative Vacancy Transfer Probabilities for Some Elements Irradiated with Photons of 0.0208 Nanometer Wavelengths

The radiative vacancy transfer probabilities of K to L2, L3, M2, M3 sub-shells were calculated using the experimental K level widths and theoretical partial radiative transitions. The targets were irradiated with photons of 0.0208 nm wavelength. It has been observed that the obtained values in the present study agree with theoretical results, theoretical predictions and the other available experimental values. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3544

Optically thin composite resonant absorber at the near-infrared band: a polarization independent and spectrally broadband configuration

Cataloged from PDF version of article.We designed, fabricated, and experimentally characterized thin absorbers utilizing both electrical and magnetic impedance matching at the near-infrared regime. The absorbers consist of four main layers: a metal back plate, dielectric spacer, and two artificial layers. One of the artificial layers provides electrical resonance and the other one provides magnetic resonance yielding a polarization independent broadband perfect absorption. The structure response remains similar for the wide angle of incidence due to the sub-wavelength unit cell size of the constituting artificial layers. The design is useful for applications such as thermal photovoltaics, sensors, and camouflage. (C)2011 Optical Society of Americ

Exact accelerating solitons in nonholonomic deformation of the KdV equation with two-fold integrable hierarchy

Recently proposed nonholonomic deformation of the KdV equation is solved through inverse scattering method by constructing AKNS-type Lax pair. Exact and explicit N-soliton solutions are found for the basic field and the deforming function showing an unusual accelerated (decelerated) motion. A two-fold integrable hierarchy is revealed, one with usual higher order dispersion and the other with novel higher nonholonomic deformations.Comment: 7 pages, 2 figures, latex. Exact explicit exact N-soliton solutions (through ISM) for KdV field u and deforming function w are included. Version to be published in J. Phys.

Negative Even Grade mKdV Hierarchy and its Soliton Solutions

In this paper we provide an algebraic construction for the negative even mKdV hierarchy which gives rise to time evolutions associated to even graded Lie algebraic structure. We propose a modification of the dressing method, in order to incorporate a non-trivial vacuum configuration and construct a deformed vertex operator for $\hat{sl}(2)$, that enable us to obtain explicit and systematic solutions for the whole negative even grade equations

Challenges and Strategies of Translation in a Qualitative and Sensitive Research

Key strategies and challenges of translating the interview data should be considered to do justice to the meanings and voices of the participants and remove misrepresentation. This article aims to investigate the key issues around translation in qualitative and sensitive research of the examination of the men’s engagement in domestic violence interventions in the UK. While many studies report on the importance of providing credibility to the meanings of the participants’ stories, there are limited studies that explore how researchers deal with difficulties and the techniques for translating the data. This research focuses on the key issues around the translation of interview data from Turkish to English. It highlights how the researcher’s position as a translator and a researcher impacted on collecting the data from the participants in a native language and presenting them in English. This addresses methodological and ethical questions that many migrant researchers might encounter during the translation of data

Negotiating with Gatekeepers: Reflexivity in Exploring Turkish Men's Engagement in Domestic Violence Perpetrators Interventions in the UK

This article explores methodological and ethical challenges and complexities in negotiating access with gatekeepers in research that examines Turkish perpetrators’ engagement in domestic violence interventions in the UK. This research presents the examples and conceptual information about the process of working with gatekeepers based on the sensitive research topic. This paper draws on the first author’s own experiences and the emotional impact of undertaking such sensitive research where community leaders held patriarchal beliefs. It also argues that there are challenges in building trust and rapport with gatekeepers which are related to gender power relations; stigmatisation in the community; ideologies around masculinity and patriarchy. Based on the experience of accessing hard-to-reach participants while undertaking a doctoral study, this paper discusses issues that arise when negotiating with gatekeepers to access study participants. The paper contributes to debates about gatekeepers by discussing the benefits of ethical considerations and of implementing reflexivity and field notes in the gatekeeping process

The Effects of Cocaine on Different Redox Forms of Cysteine and Homocysteine, and on Labile, Reduced Sulfur in the Rat Plasma Following Active versus Passive Drug Injections

Received: 28 November 2012 / Revised: 19 April 2013 / Accepted: 6 May 2013 / Published online: 16 May 2013 The Author(s) 2013. This article is published with open access at Springerlink.comThe aim of the present studies was to evaluate cocaine-induced changes in the concentrations of different redox forms of cysteine (Cys) and homocysteine (Hcy), and products of anaerobic Cys metabolism, i.e., labile, reduced sulfur (LS) in the rat plasma. The above-mentioned parameters were determined after i.p. acute and subchronic cocaine treatment as well as following i.v. cocaine self-administration using the yoked procedure. Additionally, Cys, Hcy, and LS levels were measured during the 10-day extinction training in rats that underwent i.v. cocaine administration. Acute i.p. cocaine treatment increased the total and protein-bound Hcy contents, decreased LS, and did not change the concentrations of Cys fractions in the rat plasma. In turn, subchronic i.p. cocaine administration significantly increased free Hcy and lowered the total and protein-bound Cys concentrations while LS level was unchanged. Cocaine self-administration enhanced the total and protein-bound Hcy levels, decreased LS content, and did not affect the Cys fractions. On the other hand, yoked cocaine infusions did not alter the concentration of Hcy fractions while decreased the total and protein-bound Cys and LS content. This extinction training resulted in the lack of changes in the examined parameters in rats with a history of cocaine self-administration while in the yoked cocaine group an increase in the plasma free Cys fraction and LS was seen. Our results demonstrate for the first time that cocaine does evoke significant changes in homeostasis of thiol amino acids Cys and Hcy, and in some products of anaerobic Cys metabolism, which are dependent on the way of cocaine administration

Empirical model assessment of commercial aircraft emissions according to flight phases

The quantities of common emissions are investigated for a specific type of commercial aircraft. Actual flight data and International Civil Aviation Organization emission data are used. All flight phases are considered, including landing and takeoff phases. The investigation is carried out for the domestic flights only and considers relevant parameters, such as engine type, flight phase, and ground or air operation of the flight. The findings suggest that the quantities of emissions of unburned hydrocarbon (HC) and carbon monoxide (CO) during the descent phase can exceed those for the taxi phases and the idle operation of the engines, depending on the approach procedure. The main source of nitrogen oxide (NOx) is usually the climb phase, while the mean total flight emissions are calculated as 6 to 8 kg of HC, 60 to 75 kg of CO, and 28 to 31 kg of NOx. The effect of the duration of taxi phase on the production of HC and CO emissions is also discussedAmerican Society of Mechanical Engineers Canadian Healthcare Engineering SocietyETT is a doctor who is an assistant professor in the Faculty of Aeronautics and Space Sciences at Anadolu University. He received his BSc and MSc in the School of Civil Aviation and Graduate School of Sciences at Anadolu University in 1999 and 2003, respectively. He received his PhD in 2007. OU received her BSc degree in Electrical and Electronics Engineering from Anadolu University in 1990 and her MSc degree in Exploitation Aeronautique from Ecole Nationale de l'Aviation Civile. She received her PhD degree from the Graduate School of Science, Department of Civil Aviation at Anadolu University in 1999 and has been working at the Department of Air Traffic Control, Faculty of Aeronautics and Space Sciences, Anadolu University as an assistant professor. MAR is a professor in the Faculty of Engineering and Applied Science at the University of Ontario Institute of Technology, where he was a founding dean from 2002 to 2008. He was the former president of the Engineering Institute of Canada. He served as president of the Canadian Society for Mechanical Engineering and is a fellow of that society as well as the Engineering Institute of Canada, the Canadian Academy of Engineering, the American Society of Mechanical Engineers, and the International Energy Foundation. Previously, he was the chair of the Department of Mechanical Engineering at Ryerson University.The authors thank Captain Cahit Tasbas, Captain Mustafa Kemal Helvacioglu, and FDM Specialist Ms. Sercin Ozen from Pegasus Airlines for their co-operation, and the Sabiha Gokcen Airport Authority for its kind assistance in data acquisition. The authors also thank Anadolu University for the financial support