Lasing with Topological Weyl Semimetal

Lasing behavior of optically active planar topological Weyl semimetal (TWS) is investigated in view of the Kerr and Faraday rotations. Robust topological character of TWS is revealed by the presence of Weyl nodes and relevant surface conductivities. We focus our attention on the surfaces where no Fermi arcs are formed, and thus Maxwell equations contain topological terms. We explicitly demonstrate that two distinct lasing modes arise because of the presence of effective refractive indices which lead to the birefringence phenomena. Transfer matrix is constructed in such a way that reflection and transmission amplitudes involve $2\times2$ matrix-valued components describing the bimodal character of the TWS laser. We provide associated parameters of the topological laser system yielding the optimal impacts. We reveal that gain values corresponding to the lasing threshold display a quantized behavior, which occurs due to topological character of the system. Our proposal is supported by the corresponding graphical demonstrations. Our observations and predictions suggest a concrete way of forming TWS laser and coherent perfect absorber; and are awaited to be confirmed by an experimental realization based on our computations.Comment: 17 pages, 9 figures, 3 table

Does Social Capital Have an Effect on Industry Production in G7 Countries? Causality Analysis

Abstract. The relationship between social capital and economic growth has become an attractive research area in the literature recently. In this context, this paper examines the relationship between social capital indicators and industry production in the period of 2006-2014 with monthly data for the G7 countries. For empirical analysis, panel causality analysis method developed by Dumitrescu & Hurlin (2012) was used. Results indicate that there is a bidirectional relationship between social capital indicators and industry production. These findings support feedback hypothesis in the context of social capital and economic growth in the G7 countries.Keywords. Social capital, Industry production, Economic growth, Panel causality, G7 Countries.JEL. F63, J24, O47

ASSESSMENT OF ANAEROBIC POWER WITH ARM AND LEG WINGATE TESTS IN ATHLETES

The research was carried out with the aim of determining and assessing arm anaerobic power, leg anaerobic power and aerobic capacity in individuals with different branches of active sports. A total of 60 subjects engaged in active sports at Elite level in different branches participated in the study. These branches are; wrestling (group G, n:10), football (Group F, N = 10), bicycle (BI group, n = 10), boxing (BO group, n = 10), taekwondo (TA group, n = 10), and tennis (TE group, n = 10). The research was carried out in the performance Laboratory of Selçuk University School of Physical Education and Sports. For anaerobic measurements, two separate Monark branded Wingate ergometers for arm and leg were used. Shuttle run tests were performed for aerobic measurements. SPSS for Windows 15.0 package program was used in the calculation and assessment of the obtained data. The normality distribution of the measured parameters was determined by the Shapiro-Wilks test. One-way variance analysis (ANOVA) was used to determine the differences between sports branches. In determining the source of difference, the LCD and Dunnett's C were applied from Post-Hoc tests. Significance level was taken as 0.05 in this study. As a result of the leg Wingate ergometer test, the peak power values of wrestlers were found to be significantly different at p<0.05 level compared to those of football, boxing, taekwondo and tennis players. The results of arm Wingate ergometer test showed that the peak power values of the boxers and wrestlers were significantly different in p<0.05 compared to the athletes in other branches. When their MaxVO2 levels were examined, it was observed that the values of cyclists differ significantly in p<0.05 compared to the average of athletes in other branches except wrestlers.  Article visualizations

Bezmasene čestice spina 1 u rotirajućem prostoru-vremenu

We consider the massless Duffin-Kemmer-Petiau equation for the general rotating space-times, then find its second-order form for a given geometry. Using this second-order differential equation for two well-known cosmological models, the exact solutions of the massless Duffin-Kemmer-Petiau equation were obtained. On the other hand, by using spinor form of the Maxwell equations, the propagation problem is reduced to the solution of the second-order differential equation of a complex combination of the electric and magnetic fields. For these two different approaches, we obtain the spinors in terms of the field-strength tensor.Razmatramo bezmasenu jednadžbu Duffin–Kemmer–Petiau-a za opći slučaj rotirajućeg prostora-vremena i nalazimo njen oblik drugog reda za pojedinu geometriju. Primjenom te jednadžbe drugog reda postigli smo egzaktna rješenja Duffin– Kemmer–Petiau-ve jednadžbe za dva poznata kozmološka modela. Pored toga, primjenom Maxwellovih jednadžbi u spinornom obliku, problem širenja valova svodi se na rješavanje diferencijalne jednadžbe drugog reda za kompleksni slog električnih i magnetskih polja. Tim dvama pristupima dobivamo spinore izražene preko tenzora jakosti polja

Bezmasene čestice spina 1 u rotirajućem prostoru-vremenu

We consider the massless Duffin-Kemmer-Petiau equation for the general rotating space-times, then find its second-order form for a given geometry. Using this second-order differential equation for two well-known cosmological models, the exact solutions of the massless Duffin-Kemmer-Petiau equation were obtained. On the other hand, by using spinor form of the Maxwell equations, the propagation problem is reduced to the solution of the second-order differential equation of a complex combination of the electric and magnetic fields. For these two different approaches, we obtain the spinors in terms of the field-strength tensor.Razmatramo bezmasenu jednadžbu Duffin–Kemmer–Petiau-a za opći slučaj rotirajućeg prostora-vremena i nalazimo njen oblik drugog reda za pojedinu geometriju. Primjenom te jednadžbe drugog reda postigli smo egzaktna rješenja Duffin– Kemmer–Petiau-ve jednadžbe za dva poznata kozmološka modela. Pored toga, primjenom Maxwellovih jednadžbi u spinornom obliku, problem širenja valova svodi se na rješavanje diferencijalne jednadžbe drugog reda za kompleksni slog električnih i magnetskih polja. Tim dvama pristupima dobivamo spinore izražene preko tenzora jakosti polja

Universal transceivers: Opportunities and future directions for the internet of everything (IOE)

The Internet of Everything (IoE) is a recently introduced information and communication technology (ICT) framework promising for extending the human connectivity to the entire universe, which itself can be regarded as a natural IoE, an interconnected network of everything we perceive. The countless number of opportunities that can be enabled by IoE through a blend of heterogeneous ICT technologies across different scales and environments and a seamless interface with the natural IoE impose several fundamental challenges, such as interoperability, ubiquitous connectivity, energy efficiency, and miniaturization. The key to address these challenges is to advance our communication technology to match the multi-scale, multi-modal, and dynamic features of the natural IoE. To this end, we introduce a new communication device concept, namely the universal IoE transceiver, that encompasses transceiver architectures that are characterized by multi-modality in communication (with modalities such as molecular, RF/THz, optical and acoustic) and in energy harvesting (with modalities such as mechanical, solar, biochemical), modularity, tunability, and scalability. Focusing on these fundamental traits, we provide an overview of the opportunities that can be opened up by micro/nanoscale universal transceiver architectures towards realizing the IoE applications. We also discuss the most pressing challenges in implementing such transceivers and briefly review the open research directions. Our discussion is particularly focused on the opportunities and challenges pertaining to the IoE physical layer, which can enable the efficient and effective design of higher-level techniques. We believe that such universal transceivers can pave the way for seamless connection and communication with the universe at a deeper level and pioneer the construction of the forthcoming IoE landscape. Index Terms– Internet of Everything, Universal IoE Transceiver, Interoperability, Multi-modality, Hybrid Energy Harvesting, Molecular Communications, THz Communications, Graphene and related nanomaterials

Spindle Cell Carcinoma of the Tongue: A Rare Tumor in an Unusual Location

Spindle cell carcinoma is a rare biphasic tumor consisting of epithelial and mesenchymal components. Presence of this tumor type in the tongue has rarely been reported. Herein, a case of 55-year-old woman who presented with a polypoid lesion at her tongue has been reported. Surgery was performed and pathologic examination revealed a spindle cell carcinoma. We present this rare tumor with an unusual location to contribute in part to the better understanding and awareness of this rare malignancy

Demonstration of chewing-related areas in the brain via functional magnetic resonance imaging

Purpose: To localize and identify chewing-related areas and their connections with other centres in the human brain using functional magnetic resonance imaging (fMRI). Material and methods: The paradigm of the present study was block designed. Spontaneous and controlled chewing with sugar-free gum was used as the main task in a 3-Tesla fMRI unit with a 32-channel birdcage coil. Our study population comprised 32 healthy volunteers. To determine possible intersections, we also put the rosary pulling (silent tell one's beads) movement in the fMRI protocol. The data analyses were performed with the Statistical Parametric Mapping (SPM) toolbox integrated into the Matlab platform. Results: The superomedial part of the right cerebellum was activated during either pulling rosary beads or spontaneous chewing. This region, however, was not activated during controlled chewing. We did not find statistically significant activation or connection related to the brain stem. Conclusion: We have confirmed that the cerebellum plays an important role in chewing. However, we could not find a definite central pattern generator (CPG) in the brain stem, which has been hypothesized to underlie spontaneous chewing