Electric Circuit Simulation of Floquet Topological Insulators

We present a method for simulating any non-interacting and time-periodic tight-binding Hamiltonian in Fourier space using electric circuits made of inductors and capacitors. We first map the time-periodic Hamiltonian to a Floquet Hamiltonian, which converts the time dimension into a Floquet dimension. In electric circuits, this Floquet dimension is simulated as an extra spatial dimension without any time dependency in the electrical elements. The number of replicas needed in the Floquet Hamiltonian depends on the frequency and strength of the drive. We also demonstrate that we can detect the topological edge states (including the anomalous edge states in the dynamical gap) in an electric circuit by measuring the two-point impedance between the nodes. Our method paves a simple and promising way to explore and control Floquet topological phases in electric circuits.Comment: 6 pages, 5 figure

Floquet states and optical conductivity of an irradiated two dimensional topological insulator

We study the topology of the Floquet states and time-averaged optical conductivity of the lattice model of a thin topological insulator subject to a circularly polarized light using the extended Kubo formalism. Two driving regimes, the off-resonant and on-resonant, and two models for the occupation of the Floquet states, the ideal and mean-energy occupation, are considered. In the ideal occupation, the real part of DC optical Hall conductivity is shown to be quantized while it is not quantized for the mean energy distribution. The optical transitions in the Floquet band structure depend strongly on the occupation and also the optical weight which consequently affect all components of optical conductivity. At high frequency regime, we present an analytical calculation of the effective Hamiltonian and also its phase diagram which depends on the tunneling energy between two surfaces. The topology of the system shows rich phases when it is irradiated by a weak on-resonant drive giving rise to emergence of anomalous edge states.Comment: 11 pages, 8 figure

On applicability of truncation method for damped axially moving string

In this paper, the detailed study of the transversal vibrations of a damped axially moving string is considered. Two end pulleys of the string are taken to be fixed and the initial conditions are assumed to be of general displacement field and the general velocity field. The axial speed of the string is considered to be sinusoidal, time-dependent and small compared to wave-velocity. A two timescales perturbation method with a combination of Fourier-sine series which fits the boundary conditions is employed in order to formulate the valid and uniform asymptotic approximations of the exact solutions for the equation. It is found that there are infinitely many values of frequency parameter Ω which cause the internal resonances in system. The fundamental resonant frequency, the non-resonant frequency and the detuning cases have been discussed and analyzed in detail. It has been found explicitly that the total mechanical energy of the infinite dimensional system decreases for two cases of the damping parameter, that is, for δ=2 and for δ>2. By truncation method it has been shown that the mode-amplitude response for first few modes is stable. So, Galerkin’s truncation method may be possible for these two cases of the parameter δ. But for case δ<2 the total mechanical energy of belt system is increasing exponentially. Therefore, it is evident that the Galerkin’s truncation method cannot be applied in order to obtain valid approximations on long timescales, that is, on timescales of O1/ε

On Energy Estimates for Damped String-Like Equation Considering Dirichlet, Neumann and Robin Boundary Conditions

This article provides detailed construction of energy estimates of the viscous damping aspects for axially moving string, which is modeled by a linear homogeneous sting-like equation, will be studied. The nine different boundary conditions are considered for the axially moving continua. The problem at hand describes the damped vertical vibrations of string-like equations, for example, a conveyor belt system and a band-saw blade. In this work, the velocity and coefficient of damping are kept positive and fixed. The stability of the system substantially depends upon change in boundary and subsequently boundary conditions. Also a decay in oscillatory energy is observed in all the considered cases of boundary conditions due to viscous damping. In some cases, the belt energy may increase or may decrease due to variations in different parameters . This exposes the uncertainty in these cases. Keywords: Belt Conveyor, String, Axially translating, Viscous dampin

Fast neutrino flavor conversions in one-dimensional core-collapse supernova models with and without muon creation

In very dense environments, neutrinos can undergo fast flavor conversions on scales as short as a few centimeters provided that the angular distribution of the neutrino lepton number crosses zero. This work presents the first attempt to establish whether the non-negligible abundance of muons and their interactions with neutrinos in the core of supernovae can affect the occurrence of such crossings. For this purpose we employ state-of-the-art one-dimensional core-collapse supernova simulations, considering models that include muon-neutrino interactions as well as models without these reactions. Although a consistent treatment of muons in the equation of state and neutrino transport does not seem to modify significantly the conditions for the occurrence of fast modes, it allows for the existence of an interesting phenomenon, namely fast instabilities in the $\mu-\tau$ sector. We also show that crossings below the supernova shock are a relatively generic feature of the one-dimensional simulations under investigation, which contrasts with the previous reports in the literature. Our results highlight the importance of multi-dimensional simulations with muon creation, where our results must be tested in the future.Comment: 10 pages, 5 figures in the main text. An appendix has been added with 3 figures showing a comparison between results obtained with different assumptions. The main results are unchanged, but their interpretation has been slightly modified and sometimes extended to improve clarity. Matches the version accepted on PR

Measures of implicit cognition for marketing research

Automatic, unconscious processes largely influence human decision-making. However, quantitative market research focuses on eliciting conscious responses. This foregoes the opportunity to investigate - and steer - preceding cognitive processes of decision-making. Three implicit cognitions are of special relevance along consumers' journey: Implicit attention introduces the first perception of a stimulus. Implicit associations can cause attitude and preference formation. Finally, approach tendencies can induce impulse buying. This paper provides a broad methodological overview of these implicit cognition measures to guide future researchers' marketing applications. It presents the methods' theoretical foundations, outlines how they can overcome explicit measures' limitations, and sketches their potential for marketing applications. In addition, the authors describe important research paradigms, alternative experimental setups, and data analyses steps to enable researchers to use implicit measurement tools. The measurement instruments are implemented in a non-profit software (AskYourBrain) and tested in an illustrative study. Key findings are summarized and marketing application suggestions made

Rational prescribing practice assessment among resident doctors in a tertiary care teaching hospital: a questionnaire based observational study

Background: One of the important factors in health policy is recognised to be rational use of medicines (RUM). Physicians can influence the health and well-being of patients by prescribing appropriate drug in right doses and they should be taught to prescribe rationally at the earliest of their professional carrier.Methods: This cross-sectional, questionnaire-based study was carried out in SMHS hospital which is a tertiary-care teaching hospital associated with Government Medical College, Srinagar, Jammu and Kashmir, India.Results: Out of 106 resident doctors enrolled in the study, 96.2% respondents were aware about the term essential medicines of India, and 47.6% had National List of Essential Medicines of India available at their work place. When the participants were questioned about the term RUM only 17% of them responded positively, but majority of the resident doctors (88.67%) were aware about the ingredients of the drugs they use to prescribe. Though only 3.7% of our participating doctors always use essential medicines during their prescription writing but majority of them (96.22%) would always use to inform the patient regarding disease, drug therapy and monitoring of drug therapy.Conclusions: Considering the fact that respondents are future prescribers they should be aware of all aspects about RUM and improper knowledge in certain areas of RUM is a matter of concern that needs to be addressed

Dual pillars of hotel restaurant food quality satisfaction and brand loyalty

Purpose: The purpose of this paper is to investigate the impact of service quality (physical quality and staff behaviour) and brand equity (brand quality, brand awareness and brand image) on hotel restaurant food quality satisfaction and brand loyalty among international and local travellers in Malaysia. Design/methodology/approach: A total of 354 valid questionnaires were collected to assess the measurement and structural model for reflective latent constructs using the two steps of covariance-based structural equation modelling. Findings: The research findings suggest that while travellers’ nationality moderates the path between physical quality, staff behaviour and brand image on food quality satisfaction, it does not moderate the relationship between brand quality and brand awareness on food quality satisfaction. This finding further suggests that towards enhancing service quality and brand equity on food quality satisfaction and brand loyalty, managers should understand the important distinctions between international and local travellers. Originality/value: Previous studies have mostly examined the impact of brand equity and service quality towards tourist satisfaction and very few studies have examined the impact of restaurant service quality and brand equity on consumer satisfaction and brand loyalty specifically among international and local travellers. This is one of the first few studies providing empirical evidence and discussions in this area

On The Continuous Poisson Distribution

Abstract There are no scientific works deal directly and Extensively with the continuous Poisson distribution (CPD). There are some of rare allusions here and there. In this paper we will take this issue on our responsibility. We consider here the continuous Poisson distribution. Different methods to estimate CPD parameters are studied, Maximum Likelihood estimator, Moments estimator, Percentile estimator, least square estimator and weighted least square estimator. An empirical study is conducted to compare among these methods performances. We also consider the generating issue. Other empirical experiments are conducted to build a model for bandwidth parameter which is used for Poisson density estimation