Recursos de colección

UCL University College London Eprints (375,347 recursos)

UCL Eprints collects the work of UCL researchers and makes it freely available over the web, helping the worldwide scholarly community to discover UCL research. Institutional repositories like UCL Eprints complement the traditional academic publishing and scholarly communications processes. They raise the visibility of research and help to maximise its impact. UCL researchers are encouraged to deposit a copy of each journal article, conference paper, working paper, and any other research output, in the UCL Eprints at the earliest opportunity, ensuring that their research reaches as wide an audience as possible.

Mostrando recursos 181 - 200 de 374,858

  1. Conditional density models for asset pricing

    FilipoviĆ, D; Hughston, LP; Macrina, A
    © 2013 by World Scientific Publishing Co. Pte. Ltd. All rights reserved.We model the dynamics of asset prices and associated derivatives by consideration of the dynamics of the conditional probability density process for the value of an asset at some specified time in the future. In the case where the price process is driven by Brownian motion, an associated “master equation” for the dynamics of the conditional probability density is derived and expressed in integral form. By a “model” for the conditional density process we mean a solution to the master equation along with the specification of (a) the initial...

  2. The effect of class size on the teaching of pupils aged 7-11 years

    Blatchford, P; Russell, A; Bassett, P; Brown, P; Martin, C
    There is still little consensus on whether and how teaching is affected by small and large classes, especially in the case of students in the later primary years. This study investigated effects of class size on teaching of pupils aged 7-11 years. We used a multimethod approach, integrating qualitative information from teachers' end-of-year accounts and data from case studies with quantitative information from systematic observations. Results showed that there was more individual attention in smaller classes, a more active role for pupils, and beneficial effects on the quality of teaching. It is suggested that teachers in both large and small...

  3. Spiral arm kinematics for Milky Way stellar populations

    Pasetto, S; Natale, G; Kawata, D; Chiosi, C; Hunt, JAS; Brogliato, C
    We present a new theoretical population synthesis model (the Galaxy Model) to examine and deal with large amounts of data from surveys of the Milky Way and to decipher the present and past structure and history of our own Galaxy. We assume the Galaxy to consist of a superposition of many composite stellar populations belonging to the thin and thick disks, the stellar halo and the bulge, and to be surrounded by a single dark matter halo component. A global model for the Milky Way's gravitational potential is built up self-consistently with the density profiles from the Poisson equation. In...

  4. Development of a new measure to characterise engagement in outpatient HIV care

    Howarth, A; Burns, F; Jose, S; Hill, T; Sabin, C; Apea, V

  5. Epidemiology of Sexually Transmitted Infections in Visitors for the London 2012 Olympic Games

    Sile, B; Mohammed, H; Crook, P; Hughes, G; Mercer, C; Cassel, J; Coyne, K; Hartley, A; Hall, V; Brook, G

  6. Fabrication of in-plane gate transistors on hydrogenated diamond surfaces

    Garrido, JA; Nebel, CE; Todt, R; Rösel, G; Amann, MC; Stutzmann, M; Snidero, E; Bergonzo, P
    The fabrication of in-plane gate transistors was performed by using highly conductive surface layer induced in diamond by hydrogen termination. The insulating thin lines, obtained by using a combination of electron-beam lithography with surface oxidation were used for the separation of conductive channel from the Ohmic gate. Excellent blocking properties with leakage current of 0.3 pA/μm at 100 V and room temperature were shown by the oxidized lines of about 100 nm.

  7. Silicon-On-Diamond layer integration by wafer bonding technology

    Rabarot, M; Widiez, J; Saada, S; Mazellier, JP; Lecouvey, C; Roussin, JC; Dechamp, J; Bergonzo, P; Andrieu, F; Faynot, O; Deleonibus, S; Clavelier, L; Roger, JP
    In this study, Silicon-On-Diamond (SOD) micro-structures have been fabricated using either Smart Cut™ or bonded and Etched-Back Silicon On Insulator (BESOI) technology. Thanks to the development of an innovative smoothening process, polycrystalline diamond layers (C*) can be integrated as a buried oxide layer offering new opportunities in terms of thermal management. We describe different technological process flow investigations leading to SOD by bonding C* layer in the stack. As starting material we used poly-crystalline thin diamond films in the 200 nm to 7000 nm range of thickness. The C* is deposited by Chemical Vapour Deposition assisted by Microwave Plasma (MPCVD)...

  8. Diamond-based technology dedicated to Micro Electrode Arrays for neuronal prostheses

    Bongrain, A; Bendali, A; Lissorgues, G; Rousseau, L; Yvert, B; Scorsone, E; Bergonzo, P; Picaud, S
    Extra cellular electrical recording of the central nervous system has been used for decades by electro-physiologists to explore fundamental properties of neural networks. Thanks to the evolution of micro-technology, it is now possible to develop a new kind of Micro Electrode Array (MEA) that can be used for in vitro and in vivo applications, both to record and stimulate neuronal tissues. This paper describes an alternative approach compared to classical MEA process based on the use of a non conventional material, namely Boron Doped Diamond (B-NCD), to fabricate different kind of MEAs. We first present the specific technology developed to...

  9. Social capital, pathway to care and duration of untreated psychosis: Findings from a low- and middle-income country context

    Burns, JK; Kirkbride, JB

  10. Corrigendum: Is the incidence of psychotic disorder in decline? Epidemiological evidence from two decades of research

    Kirkbride, JB; Croudace, T; Brewin, J; Donoghue, K; Mason, P; Glazebrook, C; Medley, I; Harrison, G; Cooper, JE; Doody, GA; Jones, PB

  11. On the role of polysialoglycosphingolipids as tetanus toxin receptors

    Schiavo, G; Demel, R; Montecucco, C
    Lipid monolayers of different compositions were used to study the interaction of tetanus toxin with membrane lipids and to evaluate the role of polysialoglycosphingolipids as membrane receptors. At neutral pH, the toxin binds to dioleoylglycerophosphocholine monolayers and inserts into the phospholipid layer. This effect is potentiated by acidic phospholipids without an apparent preference for a single class of phospholipids. Polysialoglycosphingolipids further increase the fixation and penetration of tetanus toxin in lipid monolayers, but no specific requirement for a particular ganglioside was identified. The ganglioside effect is abolished in the presence of other nervous tissue lipids: cerebrosides and glycosphingolipid sulfates are...

  12. Effects of display size and navigation type on a classification task.

    Liu, C; Chapuis, O; Beaudouin-Lafon, M; Lecolinet, E; Mackay, WE

  13. Leveraging physical human actions in large interaction spaces.

    Liu, C

  14. Kolibri: tiny and fast gestures for large pen-based surfaces.

    Leitner, J; Perteneder, F; Liu, C; Rendl, C; Haller, M

  15. Evaluating the benefits of real-time feedback in mobile augmented reality with hand-held devices.

    Liu, C; Huot, S; Diehl, J; Mackay, WE; Beaudouin-Lafon, M

  16. Generalization in Multi-Layer Networks of Sigma-pi Units

    Penny, WD; Stonham, TJ
    This letter investigates a method for predicting the gen- eralization error that a multi-layer network nf Sigma-pi units will, on average, exhibit. Theoretical values are compared with those obtained by the computer simulation of small networks learning parity and contiguity functions. © 1995 IEEE

  17. Overview of researching global higher education: Challenge, change or crisis?

    David, ME
    Higher education is in crisis as it has been changing in response to major challenges, economically, politically and socially, on an international scale. How we now understand and research global higher education is challenging given the expansions in relation to the knowledge economy, economic, social and political developments around equality, diversity and social justice in global labour markets. The social sciences have become critical to these understandings, and the development of new knowledge, pedagogies, policies and practices. In this overview, the scene is set for the papers presented in this special issue which all focus on innovative approaches to imagining...

  18. Magnetic response in the underdoped cuprates

    James, AJA; Konik, RM; Rice, TM
    We examine the dynamical magnetic response of underdoped cuprates by employing a phenomenological theory of a doped resonant valence bond state where the Fermi surface is truncated into four pockets. This theory predicts a resonant spin response which, with increasing energy (0 to 100 meV), appears as an hourglass. A very-low-energy spin response is found at (π, π±δ) and (π±δ,π) and is determined by scattering from the pockets' front side to the tips of opposite pockets where a van Hove singularity resides. At energies beyond 100 meV, strong scattering is seen from (π,0) to (π,π). This theory thus provides a...

  19. Genetic characterization of the invasive mosquitofish (Gambusia spp.) introduced to Europe: Population structure and colonization routes

    Sanz, N; Araguas, RM; Vidal, O; Diez-del-Molino, D; Fernández-Cebrián, R; García-Marín, JL
    Biological invasions are considered one of the main anthropogenic factors that reduce the abundance of native species. Understanding the patterns of population structure and behavior of introduced species is important to determine invasion sources and pathways, in addition to improving the protective management of native species. Thus, we set out to advance our knowledge about the mosquitofish Gambusia spp., which is an invasive species that was introduced to southern Europe in 1921 to control mosquito populations. We assessed the genetic diversity and population structure of this species at 13 European locations, by screening variation at six microsatellite loci. We also...

  20. TIPS to manipulate myogenesis: retention of myoblast differentiation capacity using microsphere culture.

    Parmar, N; Day, R

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