Percolation Transition in the Heterogeneous Vortex State in NbSe2

A percolation transition in the vortex state of a superconducting 2H-NbSe2 crystal is observed in the regime where vortices form a heterogeneous phase consisting of ordered and disordered domains. The transition is signaled by a sharp increase in critical current that occurs when the volume fraction of disordered domains, obtained from pulsed measurements of the current-voltage characteristics, reaches the value Pc= 0.26. Measurements on different vortex states show that while the temperature of the transition depends on history and measurement speed, the value of Pc and the critical exponent characterizing the approach to it, r =1.97 $\pm$ 0.66, are universal

Boston Hospitality Review: Winter 2017

Table of contents: Family, Team or Something Else? by John Murtha -- Kitchen Organization in Full-Service Restaurants: Reducing Heat and Stress by Peter Szende and Justin Cipriano -- Rules of Engagement: Building Brand Relationships by Alex Friedman -- Corporate Social Responsibility in the Hospitality Sector by Manisha Singal and Yinyoung Rhou -- “Hold on, I have to post this on Instagram”: Trends, Talk, and Transactions of the Experiential Consumer by Steve Kent -- C-corporation Hotels vs. Hotel-REITs: A Theoretical and Practical Comparison by Tarik Dogru -- Sisters in Restaurant Success: A History of The Maramor by Jan WhitakerFamily, Team or Something Else? by John Murtha -- Kitchen Organization in Full-Service Restaurants: Reducing Heat and Stress by Peter Szende and Justin Cipriano -- Rules of Engagement: Building Brand Relationships by Alex Friedman -- Corporate Social Responsibility in the Hospitality Sector by Manisha Singal and Yinyoung Rhou -- “Hold on, I have to post this on Instagram”: Trends, Talk, and Transactions of the Experiential Consumer by Steve Kent -- C-corporation Hotels vs. Hotel-REITs: A Theoretical and Practical Comparison by Tarik Dogru -- Sisters in Restaurant Success: A History of The Maramor by Jan Whitake

Nutritional status in Turkish cystic fibrosis patients

Digitalitzat per Artypla

The CCD photometric study of the newly identified RS CVn binary star V1034 Hercules

This paper presents a new CCD Bessell VRcIc light curves and photometric analysis of the newly discovered RS CVn type eclipsing binary star VI 034 Her. The light curves were obtained at the Canakkale Onsekiz Mart University Observatory in 2006. Variations of the orbital period of the system were firstly studied. The (O - C) diagram with a low range of observing time of about 20 years shows an upward parabola, which indicates a secular increase in the orbital period of the system. The light curves are generally those of detached eclipsing binaries; however, there are large asymmetries between maxima. The VRcIc light curves were analysed with two different fitting procedures: Wilson-Devinney method supplemented with a Monte Carlo type algorithm and Information Limit Optimization Technique (ILOT). Our general results find V1034 Her. as a well detached system, in which the components are filling similar to 65% of their Roche lobes. Light curve asymmetries of the system are explained in terms of large dark starspots on the primary component. The primary star shows a long-lived spot distribution with active longitudes in the same hemisphere. (C) 2009 Elsevier B.V. All rights reserved.Onsekiz Mart University Research Foundation [2007/55]We would like to thank Professor Edwin Budding for his helpful comments on this study. We also thank Mr. G.H. Lee for checking the English. This work was supported partially by the qanakkale Onsekiz Mart University Research Foundation under Grant No. 2007/55

Zeolite-like liquid crystals

Zeolites represent inorganic solid-state materials with porous structures of fascinating complexity. Recently, significant progress was made by reticular synthesis of related organic solid-state materials, such as metal-organic or covalent organic frameworks. Herein we go a step further and report the first example of a fluid honeycomb mimicking a zeolitic framework. In this unique self-assembled liquid crystalline structure, transverse-lying π-conjugated rod-like molecules form pentagonal channels, encircling larger octagonal channels, a structural motif also found in some zeolites. Additional bundles of coaxial molecules penetrate the centres of the larger channels, unreachable by chains attached to the honeycomb framework. This creates a unique fluid hybrid structure combining positive and negative anisotropies, providing the potential for tuning the directionality of anisotropic optical, electrical and magnetic properties. This work also demonstrates a new approach to complex soft-matter self-assembly, by using frustration between space filling and the entropic penalty of chain extension

Photometry of three chromospherically active stars: V340 Gem, SAO 62042 and FI Cnc

We present a photometric study of three chromospherically active stars with long periods (V340 Gem, SAO 62042 and FI Cnc). The observations were made at the COMU Observatory in 2006 and 2007. We have made initial photometric analyses of V340 Gem and SAO 62042, which are newly discovered RS CVn-type SB1 binaries, and established the photometric variations of FI Cnc, which is a single G8III active star. Photometric rotation periods of these stars were obtained by analyzing their light variations. The light variations, observed over three or more consecutive orbital cycles, were investigated by using spot models with the program SPOT. We also discussed the surface differential rotation coefficient for the primary component of the SB1 binary star SAO 62042 in this study, using our own photometric period together with an orbital period taken from the literature. (C) 2008 Elsevier B.V. All rights reserved.Turkish TUBITAK [105T083]We thank the anonymous referee for their helpful comments in improving this manuscript. This study was supported by the Turkish TUBITAK under the Grant No. 105T083

The 2006/2007 photometric activity of three chromospherically active stars: V2075 Cyg, FG UMa and BM CVn

We present new multiband CCD photometric observations of three chromospherically active stars with long periods (V2075 Cyg, FG UMa and BM CVn). The observations were made at the Canakkale Onsekiz Mart University Observatory in 2006 and 2007. We analyzed BVRI (Bessell) CCD observations of these three RS CVn-type SB1 binaries with the following three steps: (i) Photometric rotation periods were obtained by analyzing their light variations with a differential corrections method and a Fourier transform technique. (ii) Light variations. observed over three or more consecutive orbital cycles, were investigated by using dark (cool) spot models with the program SPOT. (iii) Surface differential rotation coefficients for the primary components of these binaries were derived using our own photometric periods together with orbital periods taken from the literature. (C) 2009 Elsevier B.V. All rights reserved.Turkish TUBITAK [105T083]This study was supported by the Turkish TUBITAK under the Grant No. 105T083

First period analyses of five neglected Algol-type eclipsing binaries

We present the first study of the orbital period variations of five neglected Algol-type eclipsing binaries TT And, V342 Aql, RW Cap, Z Cas and TW Lac, using their O-C diagrams gathered from all available times of eclipse minima. These O-C diagrams indicate that term periodic variations superimposed on secular period increases as expected in mass transferring Algols. However, due to short me coverage of the data, the secular period increase is not clear in the case of BZ Cas and V342 Aql. The secular period increase is.terpreted in terms of the combined effect of mass transfer between the components of the system and the mass loss by a stellar wind on the system. The mass transfer rates from the less massive secondary components to the more massive primaries for non-conservave cases would be about 10(-7) M-circle dot/yr and 10(-8)M(circle dot))/y for RW Cap and V342 Aql, respectively, and 10(-9)M(circle dot)/yr for TT And and TW . Therefore, the Algol systems RW Cap and V342 AqI have the largest mass transfer rate, which could be in Case AB type, while tose of the Algol systems TT And and TW ' Lac display the slow mass transfer rate and they could be in Case B type. The sinusoidal -rms of the orbital period variations of all five Algol systems can be due to either by the light-time effects due to unseen components in iese systems, or by the cyclic magnetic activity effects of the cool secondary components. The possible third bodies in all five Algol binaes would have masses larger than one solar mass. If these hypothetical large massive third bodies were normal stars, they should be Aectable. Therefore, new photometric and spectroscopic observations of these systems and careful analyses of those data are required. otherwise, the cyclic magnetic activity effects of the secondary components could be the basis of a working hypothesis in explaining the,clic period variations of these systems. 2007 Elsevier B.V. All rights reserved

Cool Active Binaries Recently Studied in the CAAM Stellar Program

International Conference on Binaries - Key to the Comprehension of the Universe -- JUN 08-12, 2009 -- Masaryk Univ, Dept Theoret Phys & Astrophys, Brno, CZECH REPUBLICWe summarize recent work on cool active stars in our programme. We carried out photometry at the canakkale Onsekiz Mart University (COMU) observatory, and high-resolution spectroscopy at Mt John University Observatory, as well as collecting data from other facilties. A combination of analysis methods, including our information limit optimization technique (ILOT) with physically realistic fitting functions, as well as other public-domain software packages, have been used to find reliable parameters. Stars in our recent programme include V1430 Aql, VI 034 Her, V340 Gem, SAO 62042, FI Cnc, V2075 Cyg, FG UMa and BM CVn. Light variations, sometimes over numerous consecutive cycles, were analysed. For AB Dor and CF Tuc, we compared broadband (B and V) maculation effects with emission features in the Ca II K and H-alpha lines. Broadband light curves typically show one or two outstanding maculae. These appear correlated with the main chromospheric activity sites ('faculae'), that occur at similar latitudes and with comparable size to the photometric umbrae, but sometimes with significant displacements in longitude. The possibility of large-scale bipolar surface structure is considered, keeping in mind solar analogies. Such optical work forms part of broader multiwavelength studies, involving X-ray and microwave observations, also mentioned

A catalogue of chromospherically active binary stars (third edition)

The catalogue of chromospherically active binaries (CABs) has been revised and updated. With 203 new identifications, the number of CAB stars is increased to 409. The catalogue is available in electronic format where each system has a number of lines (suborders) with a unique order number. The columns contain data of limited numbers of selected cross references, comments to explain peculiarities and the position of the binarity in case it belongs to a multiple system, classical identifications (RS Canum Venaticorum, BY Draconis), brightness and colours, photometric and spectroscopic data, a description of emission features (Ca II H and K, H alpha, ultraviolet, infrared), X-ray luminosity, radio flux, physical quantities and orbital information, where each basic entry is referenced so users can go to the original sources.Scientific and Technological Research Council (TUBITAK) [104T508]This work has been supported by the Scientific and Technological Research Council (TUBITAK) 104T508. We thank Edwin Budding, Didem Tuysuz, Mukadder Igdi Sen and Emine Koparan for their help and various contributions. This research has made use of the SIMBAD data base, operated at CDS, Strasbourg, France and the NASA Astrophysics Data System