Floquet topological transitions in a driven one-dimensional topological insulator

The Su-Schrieffer-Heeger model of polyacetylene is a paradigmatic Hamiltonian exhibiting non-trivial edge states. By using Floquet theory we study how the spectrum of this one-dimensional topological insulator is affected by a time-dependent potential. In particular, we evidence the competition among different photon-assisted processes and the native topology of the unperturbed Hamiltonian to settle the resulting topology at different driving frequencies. While some regions of the quasienergy spectrum develop new gaps hosting Floquet edge states, the native gap can be dramatically reduced and the original edge states may be destroyed or replaced by new Floquet edge states. Our study is complemented by an analysis of Zak phase applied to the Floquet bands. Besides serving as a simple example for understanding the physics of driven topological phases, our results could find a promising test-ground in cold matter experiments

The impact of the merger of Income Tax Department with Sales Tax Department with their associated accounting and legal policies in the reduction of tax evasion

The current study aimed at identifying the impact of the integration of the merger of Income Tax Department with Sales Tax Department with their associated accounting and legal policies in the reduction of tax evasion. In order to achieve the objectives of the current study, the researcher has applied the Descriptive approach for data view, while he has applied the analytical approach for the analysis of the results of the current study. The study population consisted of the auditors of Income & Sales Tax Department in medium taxpayers directorates working in auditing  whose number was (150) auditors. A questionnaire was distributed on the study sample consisting of (150) respondents.(128) questionnaires were retrieved ,(22) were excluded because they were not valid for analysis. The actual percentage of the study sample was (85,3%). The researcher, having analyzed the responses of the study sample using SPSS, he has concluded a set of results, the most important are: There is a statistically significant difference of the merger of Income Tax Department with Sales Tax Department in the reduction of tax evasion in Jordan. There is a statistically significant difference for the merger of information systems in Income & Sales Tax Departments in the reduction of tax evasion in Jordan. There is a statistically significant difference for Anti Tax Evasion Directorate in the reduction of tax evasion in Jordan. There is a statistically significant difference for the accounting and legal policies of Income Tax Law no. 28 of 2009 in the reduction of tax evasion in Jordan. In light of the results of the current study, the researcher recommends the following: The activation of the role of Directorate of Information in the Department and supplying it with experienced staff and necessary equipment.The activation of the role of Anti Tax Evasion Directorate in the Department and supplying it with experienced staff and necessary equipment.The activation of procedures applications with regard to the in advance deduction that shall be imposed on business activities.Rehabilitation and training of Income & Sales Tax Departments staff and increase their competencies through the necessary training programs.Raising the taxpayers ‘awareness regarding the importance of tax and its role in the national economy

Observation of the Meissner effect with ultracold atoms in bosonic ladders

We report on the observation of the Meissner effect in bosonic flux ladders of ultracold atoms. Using artificial gauge fields induced by laser-assisted tunneling, we realize arrays of decoupled ladder systems that are exposed to a uniform magnetic field. By suddenly decoupling the ladders and projecting into isolated double wells, we are able to measure the currents on each side of the ladder. For large coupling strengths along the rungs of the ladder, we find a saturated maximum chiral current corresponding to a full screening of the artificial magnetic field. For lower coupling strengths, the chiral current decreases in good agreement with expectations of a vortex lattice phase. Our work marks the first realization of a low-dimensional Meissner effect and, furthermore, it opens the path to exploring interacting particles in low dimensions exposed to a uniform magnetic field

Experimental realization of plaquette resonating valence bond states with ultracold atoms in optical superlattices

The concept of valence bond resonance plays a fundamental role in the theory of the chemical bond and is believed to lie at the heart of many-body quantum physical phenomena. Here we show direct experimental evidence of a time-resolved valence bond quantum resonance with ultracold bosonic atoms in an optical lattice. By means of a superlattice structure we create a three-dimensional array of independent four-site plaquettes, which we can fully control and manipulate in parallel. Moreover, we show how small-scale plaquette resonating valence bond states with s- and d-wave symmetry can be created and characterized. We anticipate our findings to open the path towards the creation and analysis of many-body RVB states in ultracold atomic gases.Comment: 7 page, 4 figures in main text, 3 figures in appendi

The Influence of Muslim Holidays on Stock Returns of the Kenyan Listed Firms’

This research aims to show the connection between Muslim holidays[1] and stock returns. The ‘event study methodology’ was employed and using a Kenyan sample of 20 listed firm-year data observations for the years 2013–2014 of the Nairobi Securities Exchange (NSE) 20-share index price movements, the authors analyze the effects of Muslim holidays[2] on stock returns. The results show that six out of the ten holidays studied had a positive effect on stock returns. The findings demonstrate that Muslim holidays affect stock returns of companies listed at the NSE. It can be inferred from the findings that the stock market is influenced by investor sentiments and dispositions. The study showed that, at some point, when investors ‘fail’ to be rational, this causes a stock market anomaly at the NSE. The study points out a conspicuous and important gap in knowledge and suggests recommendations for regulatory authorities in the light of the findings. Keywords: Efficient capital markets, investor rationality, Muslim holidays, market anomaly, stock market investment [1] These are religious practices whose aim, like all other fundamentals of Islam, is to imbibe piety and self-righteousness, and promote the spirit of sacrifice for a right cause. [2] In this study, the words holy day and holiday have been used interchangeably hence mean one and the same thing

Realization of the Hofstadter Hamiltonian with Ultracold Atoms in Optical Lattices

We demonstrate the experimental implementation of an optical lattice that allows for the generation of large homogeneous and tunable artificial magnetic fields with ultracold atoms. Using laser-assisted tunneling in a tilted optical potential we engineer spatially dependent complex tunneling amplitudes. Thereby atoms hopping in the lattice accumulate a phase shift equivalent to the Aharonov-Bohm phase of charged particles in a magnetic field. We determine the local distribution of fluxes through the observation of cyclotron orbits of the atoms on lattice plaquettes, showing that the system is described by the Hofstadter model. Furthermore, we show that for two atomic spin states with opposite magnetic moments, our system naturally realizes the time-reversal symmetric Hamiltonian underlying the quantum spin Hall effect, i.e., two different spin components experience opposite directions of the magnetic field

Like-Triple Diabetes as First Manifestation of MODY2 in an Overweight Teenager With Transient Multiple Antibodies. Diabetes Care 2014; 37: e66-e67

Ctr Referencia Estadual Assistencia Ao Diabet & E, Salvador, BA, BrazilUniversidade Federal de São Paulo, Ctr Diabet, São Paulo, BrazilUniversidade Federal de São Paulo, Ctr Diabet, São Paulo, BrazilWeb of Scienc

Advanced Technologies and the Future of Medicine and Surgery

Technology has become a major driver of the future direction of healthcare and surgery. Likewise, the speed of change has accelerated beyond comprehension, with a number of revolutions occurring during a surgeon's career. Being an agent of change or rapidly adapting to change has become the hallmark of the gifted surgeon. The fundamental challenges to a future surgeon are addressed from a technological viewpoint, with emphasis on the impact upon healthcare

Controle glicêmico em pacientes adultos com diabetes do tipo 1 em uma cidade brasileira: comparação entre abordagem multidisciplinar e endocrinológica de rotina

OBJECTIVE: To evaluate the metabolic control of a cohort of adult type 1 diabetes mellitus (T1DM) patients assisted in a public Diabetes Center (DC) that follows the rules of a national diabetes society. METHODS: We compared for one year the metabolic control and the characteristics of 175 T1DM patients attended by a multidisciplinary team in a DC (test group) with 30 patients assisted only by endocrinologists at a public endocrinology outpatient center (control group). RESULTS: The test group presented a larger proportion of well-controlled patients (p= 0.002). The proportions (test x control group) were as follows: 51.4% x 16.7% in the subgroup with A1C 8%. Patients assisted in the DC presented a likelihood 4.38 times higher of reaching levels of A1C up to 7%. CONCLUSIONS: This study shows the effectiveness of a DC and emphasizes the importance of education, adherence and multidisciplinarity as cornerstones for the treatment, showing that in developing countries it is possible to treat T1DM with satisfactory results.OBJETIVO: Avaliar o controle metabólico de uma coorte de pacientes adultos com diabetes do tipo 1 (DM1) atendidos em um Centro de Diabetes (CD) que segue as normas da Sociedade Brasileira de Diabetes. MÉTODOS: Foram comparados o controle glicêmico e as características de 175 pacientes com DM1 atendidos por uma equipe multidisciplinar em um CD (grupo teste) com 30 pacientes assistidos em um ambulatório de endocrinologia geral (grupo controle) durante um ano. RESULTADOS: O grupo teste apresentou uma maior proporção de pacientes bem controlados (p= 0,002). As proporções (grupo teste x grupo controle) foram: 51,4% x 16,7% no subgrupo com A1C 8%. Os pacientes atendidos no CD apresentaram probabilidade 4,38 vezes maior de atingir níveis de A1C até 7%. CONCLUSÃO: O estudo mostra a efetividade do CD e enfatiza a importância da educação, aderência e da multidisciplinaridade como pedras angulares do tratamento, mostrando ser possível tratar o DM1 nos países em desenvolvimento com resultados satisfatórios.Universidade Federal de São Paulo (UNIFESP)Universidade Federal de Juiz de Fora Departamento de FisiologiaUNIFESPSciEL