Minutes-duration optical flares with supernova luminosities

In recent years, certain luminous extragalactic optical transients have been observed to last only a few days1. Their short observed duration implies a different powering mechanism from the most common luminous extragalactic transients (supernovae), whose timescale is weeks2. Some short-duration transients, most notably AT2018cow (ref. 3), show blue optical colours and bright radio and X-ray emission4. Several AT2018cow-like transients have shown hints of a long-lived embedded energy source5, such as X-ray variability6,7, prolonged ultraviolet emission8, a tentative X-ray quasiperiodic oscillation9,10 and large energies coupled to fast (but subrelativistic) radio-emitting ejecta11,12. Here we report observations of minutes-duration optical flares in the aftermath of an AT2018cow-like transient, AT2022tsd (the ‘Tasmanian Devil’). The flares occur over a period of months, are highly energetic and are probably nonthermal, implying that they arise from a near-relativistic outflow or jet. Our observations confirm that, in some AT2018cow-like transients, the embedded energy source is a compact object, either a magnetar or an accreting black hole

The launch of new brands by professional soccer teams: the case of U.S. Lecce - Salento 12

L'articolo analizza la letteratura sul branding nel marketing sportivo e partendo da essa sviluppa e testa empiricamente su un campione di tifosi del Lecce un modello che valuta le determinanti del successo del lancio di un nuovo marchio ad esso associato

Linear indices in nonlinear structural equation models: best fitting proper indices and other composites

Best fitting proper indices, Generalized canonical variables, Partial least squares, Latent factor scores, Indices, Interaction, Flat maximum,

A framework for understanding clinical reasoning in community nursing

Background: Clinical reasoning is employed to develop solutions to health needs. The impact of the clinical environment on the organization of knowledge-guiding practice has received limited attention. This gap in the clinical landscape restricts the sharing of decision-making processes. Aims: Focusing on the community, and specifically the patient's home as a context for nursing, this paper describes the creation of a collective conceptual map for a group of community nurses. There is a twofold aim of exploring the process of exposing and articulating the clinical framework and enhancing and sharing understanding of the clinical paradigm in this context. Design: An interpretive research approach was utilized. Hermeneutic phenomenology guided the level of meaning accessed and constructivism was used to build an educational picture. Methods: Multiple methods including focus groups, observation and narrative recordings were utilized to collect and analyse research data. Results: All nurses may engage with the same concepts – health, need, care and partnerships – but organized into particular frames by the guiding practice philosophy and service organization. A four-stage framework for understanding clinical reasoning in the community setting is presented. This acknowledges the multi-faceted nature of health, the lived experience of health deficits, and is located in a participation and negotiated model of care. Practice examples are presented to expose the construction of need and response which often occurs in a triadic decision-making process. Conclusions: Environment of care has significant implications on need identification and response. Relevance to clinical practice: Mechanisms to enhance the sharing of clinical reasoning and decision-making transparency are essential to aid inter- and intra-professional communication. Presentation of a clinical reasoning framework exposes the breath of 'signals' encountered in practice and the range of knowledge employed in understanding and responding to patient need