Inclusion In, and Exclusion From, Open Education Communities

This special issue is the fifth devoted to Open Educational Resources (OER) and the fourth to be drawn from papers presented at the annual UK-based OER conference. For this special issue, the editors selected papers from the OER14 conference, held in Newcastle in April 2014. The main conference theme was ‘Building communities of open practice’ with further themes on MOOCs and open courses; academic practice, development and pedagogy; open policy, research, scholarship and access; and students as users and co-creators. As open education matures it will be the communities we develop that make a difference to the success (or failure) of transforming education through openness. The five chosen papers in this special issue exemplify one facet of building communities of open practice – how people may, in theory and in practice, be included in or excluded from such communities despite the potential of the openness on offer

Catálogo de los braquiópodos españoles del Jurásico inferior depositados en el Museo Geominero (ITGE, Madrid)

Se revisan desde el punto de vista taxonómico y bioestratigráfico los braquiópodos españoles del Jurásico Inferior que constituyen la colección del Museo Geominero. La colección está compuesta por 1102 ejemplares procedentes de 98 localidades diferentes repartidas fundamentalmente por el sector nororiental de la Península Ibérica. Se han identificado 23 géneros (10 de rinconélidos, 3 de espiriféridos y 10 de terebratúlidos) y 59 especies (24 de rinconélidos, 5 de espiriféridos y 30 de terebratúlidos)

Electron-phonon interaction in quantum-dot/quantum-well semiconductor heterostructures

Polar optical phonons are studied in the framework of the dielectric continuum approach for a prototypical quantum-dot/quantum-well (QD/QW) heterostructure, including the derivation of the electron-phonon interaction Hamiltonian and a discussion of the effects of this interaction on the electronic energy levels. The particular example of the CdS/HgS QD/QW is addressed and the system is modelled according to the spherical geometry, considering a core sphere of material "1" surrounded by a spherically concentric layer of material "2", while the whole structure is embedded in a host matrix assumed as an infinite dielectric medium. The strength of the electron-LO phonon coupling is discussed in details and the polaronic corrections to both ground state and excited state electron energy levels are calculated. Interesting results concerning the dependence of polaronic corrections with the QD/QW structure size are analyzed.Comment: 8 pages, 5 figure

Evolución de las actitudes hacia la estadística en estudiantes de psicología

La Estadística se ha incorporado en forma generalizada al currículum de la mayoría de estudios universitarios como fruto del importante papel que desempeña en la formación científica y técnica de profesionales de muy variado perfil. Su estudio ayuda al desarrollo personal, fomentando un razonamiento crítico, basado en la valoración de la evidencia objetiva; así hemos de ser capaces de usar los datos para controlar nuestros juicios e interpretar los de los demás

Interband electron Raman scattering in a quantum wire in a transverse magnetic field

Electron Raman scattering (ERS) is investigated in a parabolic semiconductor quantum wire in a transverse magnetic field neglecting by phonon-assisted transitions. The ERS cross-section is calculated as a function of a frequency shift and magnetic field. The process involves an interband electronic transition and an intraband transition between quantized subbands. We analyze the differential cross-section for different scattering configurations. We study selection rules for the processes. Some singularities in the Raman spectra are found and interpreted. The scattering spectrum shows density-of-states peaks and interband matrix elements maximums and a strong resonance when scattered frequency equals to the "hybrid" frequency or confinement frequency depending on the light polarization. Numerical results are presented for a GaAs/AlGaAs quantum wire.Comment: 8 pages, 5 figure

Potentially Harmful Microalgae from the Southern-Central Coast of Cuba

Benthic and planktic toxic microalgae from the southern-central region of Cuba were surveyed intermittently between 2007 and 2009, mainly in the estuarine Cienfuegos Bay and its adjacent coast. The highest abundance of both benthic and planktic species were recorded in dry season and at the beginning of the rainy period which is directly correlated with a higher incidence of ciguatera and other episodes associated to harmful algal blooms. Ostreopsis lenticularis and Gambierdiscus caribaeus were the dominant benthic species in the eastern coast. After heavy rain, Ostreopsis ovata and Prorocentrum lima were dominant. Moderate abundance of the potentially ciguatotoxic Prorocentrum concavum, P.rathymum and the dermatotoxic cyanophyte Lyngbya majuscula were registered on blooms of macroalgae. Gymnodinium catenatum, Pyrodinium bahamense and Dinophysis ovum were first reported in the region. Blooms of the diatom Pseudo-nitzschia multistriata have been observed in eutrophic zones. A small episode of dead fish was associated to blooms of Heterocapsa circularisquama. Other toxic or noxious species have been seen accompanying such as Cochlodinium polykrikoides, Dinophysis caudata, Gonyaulax polygramma, G. spinifera and Prorocentrum minimum. High abundance of the cyanobacteria Planktothrix isothrix, Pseudoanabaena sp., Dolichospermum solitarium and Microcystis aeruginosa were registered in the bay after hurricanes.Versión del edito

Interface optical phonons in spheroidal dots: Raman selection rules

The contribution of interface phonons to the first order Raman scattering in nanocrystals with non spherical geometry is analyzed. Interface optical phonons in the spheroidal geometry are discussed and the corresponding Frohlich-like electron-phonon interaction is reported in the framework of the dielectric continuum approach. It is shown that the interface phonon modes are strongly dependent on the nanocrystal geometry, particularly on the ellipsoid's semi-axis ratio. The new Raman selection rules have revealed that solely interface phonon modes with even angular momentum are allowed to contribute to the first order phonon-assisted scattering of light. On this basis we are able to give an explanation for the observed low frequency shoulders present in the Raman cross-section of several II-VI semiconductor nanostructures.Comment: 8 pages, 2 figure

Planktonic Chlorophyceae from the lower Ebro River (Spain)

On samples obtained in 4 seasonal periods between April 1999 and February 2000 from the last 18 km of Ebro River (Spain) some interesting planktonic coccal green algae (Chlorophyceae) were found. This paper offers comments and taxonomical observations on 60 taxa. Crucigenia smithii (Kirchner) W. et G. S. West, Crucigeniella pulchra (W. et G.S.West) Komárek, Elakatothrix genevensis (Reverdin) Hindák, E. subacuta Koršikov, Nephrocytium schilleri (Kammerer) Comas, Oocystidium ovale Kor{ikov, Pseudoschroederia antillarum (Komárek) Hegewald et Schnepf, Scenedesmus denticulatus var. fenestratus (Teiling) Uherkovich, S. pannonicus Hortobágyi, Siderocelis ornata (Fott) Fott, Tetrachlorella alternans (G.M. Smith) Koršikov and Tetrastrum komarekii Hindák were found for the first time in this country. The best represented genus was Scenedesmus, with 16 taxa

Cooperation across multiple healthcare clinics on the cloud

Many healthcare units are creating cloud strategies and mi- gration plans in order to exploit the benefits of cloud based computing. This generally involves collaboration between healthcare specialists and data management researchers to create a new wave of healthcare tech- nology and services. However, in many cases the technology pioneers are ahead of government policies as cloud based storage of healthcare data is not yet permissible in many jurisdictions. One approach is to store anonymised data on the cloud and maintain all identifying data locally. At login time, a simple protocol can be developed to allow clinicians to combine both sets of data for selected patients for the current session. However, the management of o↵-cloud identifying data requires a frame- work to ensure sharing and availability of data within clinics and the ability to share data between users in remote clinics. In this paper, we introduce the PACE healthcare architecture which uses a combination of Cloud and Peer-to-Peer technologies to model healthcare units or clin- ics where o↵-cloud data is accessible to all, and where exchange of data between remote healthcare units is also facilitated