Control of electronic transport in graphene by electromagnetic dressing

We demonstrated theoretically that the renormalization of the electron energy spectrum near the Dirac point of graphene by a strong high-frequency electromagnetic field (dressing field) drastically depends on polarization of the field. Namely, linear polarization results in an anisotropic gapless energy spectrum, whereas circular polarization leads to an isotropic gapped one. As a consequence, the stationary (dc) electronic transport in graphene strongly depends on parameters of the dressing field: A circularly polarized field monotonically decreases the isotropic conductivity of graphene, whereas a linearly polarized one results in both giant anisotropy of conductivity (which can reach thousands of percents) and the oscillating behavior of the conductivity as a function of the field intensity. Since the predicted phenomena can be observed in a graphene layer irradiated by a monochromatic electromagnetic wave, the elaborated theory opens a substantially new way to control electronic properties of graphene with light.Comment: Published versio

Exploring the liquidity risk factors in the Balkan Region banking system

Liquidity as a field of study has received considerable attention from various researchers over the last few years. We have conducted this research in order to identify the factors affecting the liquidity of the banking system of nine Balkan countries, specifically Albania, Bosnia and Herzegovina, Bulgaria, Croatia, Kosovo, Macedonia, Montenegro, Romania and Serbia for a period of sixteen years. We collected data on factors such as capital adequacy, non-performing loans, deposit growth and bank profitability and analysed them using the following statistical techniques: a linear regression model using Pooled Ordinary Least Squares (OLS), a Fixed Effects Model, a Random Effects Model and a Hausman-Taylor regression to account for potential endogeneity, on a set of data collected from banks in nine Balkan states, during the period 2000-2015. We also analysed the macroeconomic factors influencing the bank's liquidity, such as GDP, inflation, unemployment and marginal interest rates. Based on panel data analysis, it is noted that specific factors and macroeconomic factors, specifically, capital adequacy, non-performing loans, deposit growth, GDP, unemployment rate and marginal interest rate, significantly affect bank liquidity. However, inflation and profitability do not.peer-reviewe

Determinants of the level of non-performing loans in commercial banks of transition countries

Problem loans have generated considerable academic and policy attention in recent years, fueled in part by the aftermath of the 2008-2009 economic crisis and subsequent credit crunch. Problem loans, referred to as non-performing loans (NPL), are loans which are not paid in the structured time period as set in the contract between the borrower and the bank. The goal of this study is to show the influence, in transition countries, of macroeconomic factors on the level of these loans. Specifically, factors such as Gross Domestic Product (GDP growth), inflation, unemployment and export growth shall be considered, using a variety of econometric models and specifications to ensure robustness, including Fixed and Random Effects Models and Arellano-Bond Dynamic Panel estimation. We use data from the World Bank and International Monetary Fund for a sample of transition countries over the period 2006 and 2016. Findings show that GDP growth and inflation are both negatively and significantly correlated with the level of NPLs, while unemployment is positively-related to NPLs. These results have important implications for banking stability within transition countries, and the role of macroeconomic policies in this regard.peer-reviewe

War and Bereavement: Consequences for Mental and Physical Distress

Background: Little is known about the long-term impact of the killing of a parent in childhood or adolescence during war on distress and disability in young adulthood. This study assessed current prevalence rates of mental disorders and levels of dysfunction among young adults who had lost their father due to war-related violence in childhood or adolescence. Methods: 179 bereaved young adults and 175 non-bereaved young adults were interviewed a decade after experiencing the war in Kosovo. Prevalence rates of Major Depressive Episode (MDE), anxiety, and substance use disorders, and current suicide risk were assessed using the Mini–International Neuropsychiatric Interview. The syndrome of Prolonged Grief Disorder (PGD) was assessed with the Prolonged Grief Disorder Interview (PG-13). Somatic symptoms were measured with the Patient Health Questionnaire. General health distress was assessed with the General Health Questionnaire. Findings: Bereaved participants were significantly more likely to suffer from either MDE or any anxiety disorder than nonbereaved participants (58.7 % vs. 40%). Among bereaved participants, 39.7 % met criteria for Post-Traumatic Stress Disorder, 34.6 % for PGD, and 22.3 % for MDE. Bereaved participants with PGD were more likely to suffer from MDE, any anxiety disorder, or current suicide risk than bereaved participants without PGD. Furthermore, these participants reported significantly greater physical distress than bereaved participants without PGD. Conclusion: War-related loss during middle childhood and adolescence presents significant risk for adverse mental healt

Pertumbuhan Curah Enterococcus faecalis Id 6017 dan Kemampuan Dekolorisasi Reactive Red-2 pada Medium yang Mengandung Gliserol

Enterococcus faecalis ID 6017 can utilize glycerol as the source of carbon and energy for its growth. The present of glycerol in the medium containing Reactive Red-2 not only influenced its growth but also its ability to decolorize Reactive Red-2. The aim of this study was to investigate the growth of  Enterococcus faecalis (E. faecalis) and its ability to decolorize Reactive Red-2. The microbe was grown in batch system with three different growth medium, i.e. medium which contained (i) 1.643 g/l glycerol and 0.08 g/l reactive red-2, (ii) 1.643 g/l glycerol, and (iii) 0.08 g/l Reactive Red 2. The result of this study showed that the growth of  E. faecalis and its ability to decolorize Reactive Red-2 on medium contained glycerol was better than without glycerol. E. faecalis could not growth and decolorized Reactive Red-2 on medium without glycerol