40 research outputs found
Mechanical Isolation of Highly Stable Antimonene under Ambient Conditions
Using mechanical exfoliation combined with a controlled double step transfer
procedure we demonstrate that single layers of antimony can be readily
produced. These flakes are not significantly contaminated upon exposure to
ambient conditions and they do not react with water. DFT calculations confirm
our experimental observations and predict a band gap of 1.2-1.3 eV (ambient
conditions) for single layer antimonene, which is smaller than that calculated
under vacuum conditions at 0 K. Our work confirms antimonene as a highly stable
2D material with promising relevant applications in optoelectronics.Comment: main paper: 5 pages, 4 figures supporting: 9 pages, 7 figures,
Advanced Materials, 201
Market orientation and SNS adoption for marketing purposes in hospitality microenterprises
ABSTRACT: In a nowadays context where the social network sites (SNS) have a widespread use among users and enterprises, this paper aims to analyze the factors determining the adoption of SNS for marketing purposes by hospitality microenterprises. With this objective, our study develops a model that includes: 1) the two pillars of market orientation for companies (i.e. consumer orientation and competitor orientation); and 2) the factors of the widely used Unified Theory of Acceptance and Use of Technology (UTAUT): performance expectancy, effort expectancy, social influence, and facilitating conditions. The results from a sample of 200 hospitality microenterprises in a region of Spain show that the intention to use SNS for marketing purposes (in particular, business communication) is mainly determined by the expectancies of managers or owners about theperformance and effort in the use of the technology, and by the social influence generated by users and professionals in the sector. Additionally, in contrast to competitor orientation, customer orientation has a positive influence on performance expectancy and social influence
Clinical and immunological study of tofacitinib and baricitinib in refractory blau syndrome: case report and literature review
Blau syndrome (BS) is an autoinflammatory disorder characterized by non-caseating granulomatous dermatitis, arthritis, and uveitis. We present a case of refractory and severe BS that was treated with the Janus kinase inhibitors (JAKINIBS), Tofacitinib (TOFA) and then Baricitinib (BARI). Our aim was to describe the clinical and immunological outcomes after treatment with JAKINIBS. Blood tests and serum samples were obtained during follow-up with TOFA and BARI. We assessed their effects on clinical outcomes, acute phase reactants, absolute lymphocyte counts (ALCs), lymphocyte subset counts, immunoglobulins, and cytokine levels. A review of the literature on the use of JAKINIBS for the treatment of uveitis and sarcoidosis was also
conducted. TOFA led to a rapid and maintained disease control and a steroid-sparing effect. A
decrease from baseline was observed in ALC, CD3+, CD4+, CD8+, and natural killer (NK) cell
counts. B-cells were stable. Serum levels of interleukin (IL)-4 and tumor necrosis factor alpha
(TNF-?) increased, whereas IL-2, IL-6, IL-10, and IL-17 maintained stable. TOFA was discontinued
after 19 months due to significant lymphopenia. The initiation of BARI allowed maintaining adequate control of disease activity with an adequate safety profile. The literature review showed seven patients with uveitis and five with sarcoidosis treated with JAKINIBS. No cases of BS treated with JAKINIBS were found. We report the successful use of JAKINIBS in a patient with refractory and severe BS.Funding: The authors disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work was partially supported by Redes TemĂĄticas de InvestigaciĂłn Cooperativa en Salud (RETICS) Program, RD16/0012 Red de InvestigaciĂłn en InflamaciĂłn y Enfermedades ReumĂĄticas (RIER) from ISCIII from "Instituto de Salud Carlos III" (ISCIII) (Spain)
Capacidad predictiva de la autoeficacia académica sobre las dimensiones del autoconcepto en una muestra de adolescentes chilenos
El objetivo de este estudio fue analizar la
capacidad predictiva de la autoefi cacia académica sobre
las dimensiones del autoconcepto en una muestra
de 860 estudiantes chilenos. El anĂĄlisis de regresiĂłn
logĂstica revelĂł que la autoefi cacia acadĂ©mica fue un
predictor positivo y signifi cativo de las escalas académicas
(Matemåticas, Verbal y Académica General),
no acadĂ©micas (Habilidades FĂsicas, Apariencia FĂsica,
Relaciones con el Sexo Opuesto, Relaciones con
el Mismo Sexo, RelaciĂłn con los Padres, Sinceridad-
Veracidad), y de la escala de Autoestima, excepto de
la escala de Estabilidad Emocional. Esta relaciĂłn de
predicciĂłn fue de mayor magnitud con las escalas
académicas y autoestima.The aim of this study was to analyze the
predictive power of academic self-effi cacy on academic
self-concept dimensions in a sample of 860
Chilean students. Logistic regression analysis revealed
that the academic self-effi cacy was a positive and
signifi cant predictor of academic scales (Math, Verbal,
and General Academic), not academic (Physical
Abilities, Physical Appearance, Relationships with the
Opposite Sex, Relationships with the Same Sex, Relationship
with Parents, Sincerity-Veracity), and Self-
Esteem scale, except for the Emotional Stability scale.
The predictive value was stronger in the academic dimensions
and self-esteem
Influence of country and city images on studentsâ perception of host universities and their satisfaction with the assigned destination for their exchange programmes
ABSTRACT: This research focuses on the effect that country image, city image and university image has on studentsâ a priori satisfaction with the assigned destination for their international exchange programme (Bachelor and Master). In particular, this study establishes six hypotheses related to the causal relationships among the different typologies of image and their effects on studentsâ satisfaction with the assigned destination to study at least one semester in a host university. In order to contrast these hypotheses, a quantitative research was carried out in the Spanish city of Santander (Spain), by obtaining a sample of 245 international students who participated in an exchange programme at the University of Cantabria. The research findings are: (1) studentsâ satisfaction with the assigned destination is positively influenced by the university image; (2) the university image is positively influenced by the city image; and (3) the city image is positively influenced by the country image
Outcomes from elective colorectal cancer surgery during the SARS-CoV-2 pandemic
This study aimed to describe the change in surgical practice and the impact of SARS-CoV-2 on mortality after surgical resection of colorectal cancer during the initial phases of the SARS-CoV-2 pandemic
The wide-field, multiplexed, spectroscopic facility WEAVE : survey design, overview, and simulated implementation
Funding for the WEAVE facility has been provided by UKRI STFC, the University of Oxford, NOVA, NWO, Instituto de AstrofĂsica de Canarias (IAC), the Isaac Newton Group partners (STFC, NWO, and Spain, led by the IAC), INAF, CNRS-INSU, the Observatoire de Paris, RĂ©gion Ăle-de-France, CONCYT through INAOE, Konkoly Observatory (CSFK), Max-Planck-Institut fĂŒr Astronomie (MPIA Heidelberg), Lund University, the Leibniz Institute for Astrophysics Potsdam (AIP), the Swedish Research Council, the European Commission, and the University of Pennsylvania.WEAVE, the new wide-field, massively multiplexed spectroscopic survey facility for the William Herschel Telescope, will see first light in late 2022. WEAVE comprises a new 2-degree field-of-view prime-focus corrector system, a nearly 1000-multiplex fibre positioner, 20 individually deployable 'mini' integral field units (IFUs), and a single large IFU. These fibre systems feed a dual-beam spectrograph covering the wavelength range 366-959 nm at R ⌠5000, or two shorter ranges at R ⌠20,000. After summarising the design and implementation of WEAVE and its data systems, we present the organisation, science drivers and design of a five- to seven-year programme of eight individual surveys to: (i) study our Galaxy's origins by completing Gaia's phase-space information, providing metallicities to its limiting magnitude for ⌠3 million stars and detailed abundances for ⌠1.5 million brighter field and open-cluster stars; (ii) survey ⌠0.4 million Galactic-plane OBA stars, young stellar objects and nearby gas to understand the evolution of young stars and their environments; (iii) perform an extensive spectral survey of white dwarfs; (iv) survey âŒÂ 400 neutral-hydrogen-selected galaxies with the IFUs; (v) study properties and kinematics of stellar populations and ionised gas in z 1 million spectra of LOFAR-selected radio sources; (viii) trace structures using intergalactic/circumgalactic gas at z > 2. Finally, we describe the WEAVE Operational Rehearsals using the WEAVE Simulator.PostprintPeer reviewe
The wide-field, multiplexed, spectroscopic facility WEAVE: Survey design, overview, and simulated implementation
WEAVE, the new wide-field, massively multiplexed spectroscopic survey
facility for the William Herschel Telescope, will see first light in late 2022.
WEAVE comprises a new 2-degree field-of-view prime-focus corrector system, a
nearly 1000-multiplex fibre positioner, 20 individually deployable 'mini'
integral field units (IFUs), and a single large IFU. These fibre systems feed a
dual-beam spectrograph covering the wavelength range 366959\,nm at
, or two shorter ranges at . After summarising the
design and implementation of WEAVE and its data systems, we present the
organisation, science drivers and design of a five- to seven-year programme of
eight individual surveys to: (i) study our Galaxy's origins by completing
Gaia's phase-space information, providing metallicities to its limiting
magnitude for 3 million stars and detailed abundances for
million brighter field and open-cluster stars; (ii) survey million
Galactic-plane OBA stars, young stellar objects and nearby gas to understand
the evolution of young stars and their environments; (iii) perform an extensive
spectral survey of white dwarfs; (iv) survey
neutral-hydrogen-selected galaxies with the IFUs; (v) study properties and
kinematics of stellar populations and ionised gas in cluster galaxies;
(vi) survey stellar populations and kinematics in field galaxies
at ; (vii) study the cosmic evolution of accretion
and star formation using million spectra of LOFAR-selected radio sources;
(viii) trace structures using intergalactic/circumgalactic gas at .
Finally, we describe the WEAVE Operational Rehearsals using the WEAVE
Simulator.Comment: 41 pages, 27 figures, accepted for publication by MNRA
Differential clinical characteristics and prognosis of intraventricular conduction defects in patients with chronic heart failure
Intraventricular conduction defects (IVCDs) can impair prognosis of heart failure (HF), but their specific impact is not well established. This study aimed to analyse the clinical profile and outcomes of HF patients with LBBB, right bundle branch block (RBBB), left anterior fascicular block (LAFB), and no IVCDs. Clinical variables and outcomes after a median follow-up of 21 months were analysed in 1762 patients with chronic HF and LBBB (n = 532), RBBB (n = 134), LAFB (n = 154), and no IVCDs (n = 942). LBBB was associated with more marked LV dilation, depressed LVEF, and mitral valve regurgitation. Patients with RBBB presented overt signs of congestive HF and depressed right ventricular motion. The LAFB group presented intermediate clinical characteristics, and patients with no IVCDs were more often women with less enlarged left ventricles and less depressed LVEF. Death occurred in 332 patients (interannual mortality = 10.8%): cardiovascular in 257, extravascular in 61, and of unknown origin in 14 patients. Cardiac death occurred in 230 (pump failure in 171 and sudden death in 59). An adjusted Cox model showed higher risk of cardiac death and pump failure death in the LBBB and RBBB than in the LAFB and the no IVCD groups. LBBB and RBBB are associated with different clinical profiles and both are independent predictors of increased risk of cardiac death in patients with HF. A more favourable prognosis was observed in patients with LAFB and in those free of IVCDs. Further research in HF patients with RBBB is warranted
The wide-field, multiplexed, spectroscopic facility WEAVE: Survey design, overview, and simulated implementation
WEAVE, the new wide-field, massively multiplexed spectroscopic survey facility for the William Herschel Telescope, will see first light in late 2022. WEAVE comprises a new 2-degree field-of-view prime-focus corrector system, a nearly 1000-multiplex fibre positioner, 20 individually deployable 'mini' integral field units (IFUs), and a single large IFU. These fibre systems feed a dual-beam spectrograph covering the wavelength range 366â959\,nm at RâŒ5000, or two shorter ranges at RâŒ20000. After summarising the design and implementation of WEAVE and its data systems, we present the organisation, science drivers and design of a five- to seven-year programme of eight individual surveys to: (i) study our Galaxy's origins by completing Gaia's phase-space information, providing metallicities to its limiting magnitude for âŒ3 million stars and detailed abundances for âŒ1.5 million brighter field and open-cluster stars; (ii) survey âŒ0.4 million Galactic-plane OBA stars, young stellar objects and nearby gas to understand the evolution of young stars and their environments; (iii) perform an extensive spectral survey of white dwarfs; (iv) survey âŒ400 neutral-hydrogen-selected galaxies with the IFUs; (v) study properties and kinematics of stellar populations and ionised gas in z1 million spectra of LOFAR-selected radio sources; (viii) trace structures using intergalactic/circumgalactic gas at z>2. Finally, we describe the WEAVE Operational Rehearsals using the WEAVE Simulator