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UCL University College London Eprints (377,346 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 141 - 160 de 376,858

  1. Talking the talk…but walking the walk? How do non-specialist mathematics teachers come to see themselves as mathematics teachers?

    Crisan, C; Rodd, M
    In order to address the shortage of mathematics teachers in England, the UK government has funded various in-service subject knowledge courses for practising teachers, who are not mathematics specialists. These courses aim to develop these teachers’ mathematical subject knowledge (e.g., DfE 2014). In this TAS session we will report on a research project which was set up to investigate how teachers on the in-service programmes offered by our institution developed as teachers of mathematics. We orientated our research around a central research query: How do already qualified, non-specialist mathematics teachers come to see themselves as mathematics teachers? Our previous work...

  2. Understanding The Use Of Stolen Webmail Credentials In The Wild

    Onaolapo, J; Stringhini, G; Mariconti, E
    Parsed metadata of the accesses to stolen accounts presented in the paper "What Happens After You Are Pwnd: Understanding The Use Of Stolen Webmail Credentials In The Wild" published at the ACM Internet Measurement Conference (IMC) in 2016. The data is stored as a Python pickle dictionary.

  3. Why Reasoning?: A discussion of Matthias Frisch: Causal reasoning in physics

    Illari, PK

  4. Is Closed-Loop, Time-Locked Primary Motor Cortex Stimulation an Ideal Target for Improving Movements in Neurological Disorders?

    Brown, MJ; Macerollo, A; Kilner, JM; Chen, R

  5. How Much Do Job Satisfaction and Relationship Quality Predict Intention to Engage in Health Behaviours in Men and Women? A Pilot Study

    Lemkey, L; Fletchder, C; Barry, JA
    This study aimed to assess the degree to which problems with job satisfaction and relationship quality predict problem drinking and the intention to engage in healthy behaviours. This cross-sectional online survey was analysed using multiple linear regression. 312 men and women participated in the survey. The only significant predictor of problem drinking was neuroticism (emotionality), and this was significant for women only (β = 0.26, p <.05). The most significant predictor of intention to engage in healthy behaviours for women was feeling good about health behaviours (β = 0.36, p <.001), and for men it was greater satisfaction with the clarity...

  6. Lyman-alpha and CIII] Emission in z=7-9 Galaxies: Accelerated Reionization Around Luminous Star Forming Systems?

    Stark, D; Ellis, R; Charlot, S; Chevallard, J; Tang, M; Belli, S; Zitrin, A; Mainali, R; Gutkin, J; Vidal-Garcia, A; Bouwens, R; Oesch, P
    We discuss new Keck/MOSFIRE spectroscopic observations of four luminous galaxies at z~7-9 selected to have intense optical line emission by Roberts-Borsani et al. (2016). Previous follow-up has revealed Lyman-alpha in two of the four galaxies. Our new MOSFIRE observations confirm that Lyman-alpha is present in the entire sample. We detect Lyman-alpha emission in COS-zs7-1, confirming its redshift as z=7.154, and we detect Lyman-alpha in EGS-zs8-2 at z=7.477, verifying a tentative detection presented in an earlier study. The ubiquity of Lyman-alpha in this sample is puzzling given that the IGM is likely significantly neutral over 7

  7. Free energy of formation of clusters of sulphuric acid and water molecules determined by guided disassembly

    Parkinson, JY; Lau, GV; Ford, IJ
    We evaluate the grand potential of a cluster of two molecular species, equivalent to its free energy of formation from a binary vapour phase, using a non-equilibrium molecular dynamics technique where guide particles, each tethered to a molecule by a harmonic force, move apart to disassemble a cluster into its components. The mechanical work performed in an ensemble of trajectories is analysed using the Jarzynski equality to obtain a free energy of disassembly, a contribution to the cluster grand potential. We study clusters of sulphuric acid and water at 300 K, using a classical interaction scheme, and contrast two modes of...

  8. High Performance Liquid Chromatography as a valuable tool for geoforensic soil analysis

    McCulloch, G; Morgan, RM; Bull, PA
    A key issue for geoforensic analysis is the ability to discriminate between geographical locations of close proximity, often with similar underlying geology. This paper addresses the lack of empirical research into the non-mineral components of sediment samples and presents the development of a method of sediment sample characterisation by High Performance Liquid Chromatography (HPLC) utilising the organic components of the sample. A sample preparation method and set of instrument parameters were developed such that the cost of the analysis could be reduced, efficiency increased and the sample amount required for analysis reduced fourfold. The re-developed method allows samples collected from...

  9. Using Bayesian networks to guide the assessment of new evidence in an appeal case

    Smit, NM; Lagnado, DA; Morgan, RM; Fenton, NE
    When new forensic evidence becomes available after a conviction there is no systematic framework to help lawyers to determine whether it raises sufficient questions about the verdict in order to launch an appeal. This paper presents such a framework driven by a recent case, in which a defendant was convicted primarily on the basis of audio evidence, but where subsequent analysis of the evidence revealed additional sounds that were not considered during the trial. The framework is intended to overcome the gap between what is generally known from scientific analyses and what is hypothesized in a legal setting. It is...

  10. Team Familiarity and Productivity in Cardiac Surgery Operations: The Effect of Dispersion, Bottlenecks and Task Complexity

    Avgerinos, E; Gokpinar, B
    Fluid teams are commonly used by a variety of organizations to perform similar and repetitive yet highly critical and knowledge-intensive tasks. Such teams operate for a limited time, after which they dissolve and some of their members may work together again as part of another team. Using a granular dataset of 6,206 cardiac surgeries from a private hospital in Europe over seven years, our study offers a new and detailed account of how team familiarity (i.e., shared work experience) influences team productivity. We highlight the role of nuanced team composition dynamics beyond average team familiarity. We observe that teams with...

  11. How to make the perfect pancake

    Eames, I; Khaw, PT; Bouremel, Y
    We explore the cooking of pancakes using a combination of kitchen experiments and mathematical theory. The properties of a pancake are characterised in terms of a dimensionless geometrical measure of aspect ratio and the baker's ratio that describes the mass ratio of water or milk to flour. The patterns on the top and bottom of pancakes are analysed in a kitchen study and explained in terms of how the vapourised liquid in the batter escapes. We determine the properties of a perfect pancake.

  12. The effect of platform switching on the levels of metal ion release from different implant-abutment couples

    Alrabeah, GO; Knowles, JC; Petridis, H
    The improved peri-implant bone response demonstrated by platform switching may be the result of reduced amounts of metal ions released to the surrounding tissues. The aim of this study was to compare the levels of metal ions released from platform-matched and platform-switched implant-abutment couples as a result of accelerated corrosion. Thirty-six titanium alloy (Ti-6Al-4V) and cobalt-chrome alloy abutments were coupled with titanium cylinders forming either platform-switched or platform-matched groups (n=6). In addition, 18 unconnected samples served as controls. The specimens were subjected to accelerated corrosion by static immersion in 1% lactic acid for 1 week. The amount of metal ions...

  13. Autoadaptive motion modelling for MR-based respiratory motion estimation

    Baumgartner, CF; Kolbitsch, C; McClelland, JR; Rueckert, D; King, AP
    Respiratory motion poses significant challenges in image-guided interventions. In emerging treatments such as MR-guided HIFU or MR-guided radiotherapy, it may cause significant misalignments between interventional road maps obtained pre-procedure and the anatomy during the treatment, and may affect intra-procedural imaging such as MR-thermometry. Patient specific respiratory motion models provide a solution to this problem. They establish a correspondence between the patient motion and simpler surrogate data which can be acquired easily during the treatment. Patient motion can then be estimated during the treatment by acquiring only the simpler surrogate data. In the majority of classical motion modelling approaches once the...

  14. Narrowing the harvest: Increasing sickle investment and the rise of domesticated cereal agriculture in the Fertile Crescent

    Maeda, O; Lucas, L; Silva, F; Tanno, KI; Fuller, DQ
    For the first time we integrate quantitative data on lithic sickles and archaeobotanical evidence for domestication and the evolution of plant economies from sites dated to the terminal Pleistocene and Early Holocene (ca. 12000-5000 cal. BCE) from throughout the Fertile Crescent region of Southwest Asia. We find a strong correlation in some regions, throughout the Levant, for increasing investment in sickles that tracks the evidence for increasing reliance on cereal crops, while evidence for morphological domestication in wheats (Triticum monococcum and Triticum dicoccum) and barley (Hordeum vulgare) was delayed in comparison to sickle use. These data indicate that while the...

  15. The complete mitochondrial genome of Epomophorus gambianus (Chiroptera: Pteropodidae) and its phylogenetic analysis

    Riesle-Sbarbaro, SA; de Vries, SPW; Stubbs, S; Amponsah-Mensah, K; Cunningham, AA; Wood, JLN; Sargan, DR
    The Gambian epauletted fruit bat, Epomophorus gambianus, is widely distributed across sub-Saharan Africa. Its assembled and annotated mitochondrial genome (GenBank accession no. KT963027) is 16,702 bases in length, containing 13 protein-coding genes, 22 transfer RNA genes, two ribosomal RNA genes and two non-coding regions: the control region (D-loop) and the origin of light-strand replication (OL). The average base composition is 32.2% A; 27.6% C; 14% G; and 26.1% T. The mitogenome presented a structural composition greatly conserved between members of the Pteropodidae family.

  16. Arctic sea surface height variability and change from satellite radar altimetry and GRACE, 2003–2014

    Armitage, TWK; Bacon, S; Ridout, AL; Thomas, SF; Aksenov, Y; Wingham, DJ
    Arctic sea surface height (SSH) is poorly observed by radar altimeters due to the poor coverage of the polar oceans provided by conventional altimeter missions and because large areas are perpetually covered by sea ice, requiring specialized data processing. We utilize SSH estimates from both the ice-covered and ice-free ocean to present monthly estimates of Arctic Dynamic Ocean Topography (DOT) from radar altimetry south of 81.5°N and combine this with GRACE ocean mass to estimate steric height. Our SSH and steric height estimates show good agreement with tide gauge records and geopotential height derived from Ice-Tethered Profilers. The large seasonal...

  17. Lactobionic acid and carboxymethyl chitosan functionalized graphene oxide nanocomposites as targeted anticancer drug delivery systems

    Pan, Q; Lv, Y; Williams, GR; Tao, L; Yang, H; Li, H; Zhu, L
    In this work, we report a targeted drug delivery system built by functionalizing graphene oxide (GO) with carboxymethyl chitosan (CMC), fluorescein isothiocyanate and lactobionic acid (LA). Analogous systems without LA were prepared as controls. Doxorubicin (DOX) was loaded onto the composites through adsorption. The release behavior from both the LA-functionalized and the LA-free material is markedly pH sensitive. The modified GOs have high biocompatibility with the liver cancer cell line SMMC-7721, but can induce cell death after 24 h incubation if loaded with DOX. Tests with shorter (2 h) incubation times were undertaken to investigate the selectivity of the GO...

  18. Suprathermal electron penetration into the inner magnetosphere of Saturn

    Thomsen, MF; Coates, AJ; Roussos, E; Wilson, RJ; Hansen, KC; Lewis, GR
    For most Cassini passes through the inner magnetosphere of Saturn, the hot electron population (> few hundred eVs) largely disappears inside of some cutoff L shell. Anode-and-actuation-angle averages of hot electron fluxes observed by the Cassini Electron Spectrometer are binned into 0.1 Rs bins in dipole L to explore the properties of this cutoff distance. The cutoff L shell is quite variable from pass to pass (on timescales as short as 10–20 h). At energies of 5797 eV, 2054 eV, and 728 eV, 90% of the inner boundary values lie between L ~ 4.7 and 8.4, with a median near L = 6.2, consistent with the range of L...

  19. Spatial perspectives in the redox code-Mass spectrometric proteomics studies of moonlighting proteins

    Pinto, G; Radulovic, M; Godovac-Zimmermann, J
    The Redox Code involves specific, reversible oxidative changes in proteins that modulate protein tertiary structure, interactions, trafficking, and activity, and hence couple the proteome to the metabolic/oxidative state of cells. It is currently a major focus of study in cell biology. Recent studies of dynamic cellular spatial reorganization with MS-based subcellular-spatial-razor proteomics reveal that protein constituents of many subcellular structures, including mitochondria, the endoplasmic reticulum, the plasma membrane, and the extracellular matrix, undergo changes in their subcellular abundance/distribution in response to oxidative stress. These proteins are components of a diverse variety of functional processes spatially distributed across cells. Many of...

  20. Genetic causes of hypomagnesemia, a clinical overview

    Viering, DH; de Baaij, JH; Walsh, SB; Kleta, R; Bockenhauer, D
    Magnesium is essential to the proper functioning of numerous cellular processes. Magnesium ion (Mg(2+)) deficits, as reflected in hypomagnesemia, can cause neuromuscular irritability, seizures and cardiac arrhythmias. With normal Mg(2+) intake, homeostasis is maintained primarily through the regulated reabsorption of Mg(2+) by the thick ascending limb of Henle's loop and distal convoluted tubule of the kidney. Inadequate reabsorption results in renal Mg(2+) wasting, as evidenced by an inappropriately high fractional Mg(2+) excretion. Familial renal Mg(2+) wasting is suggestive of a genetic cause, and subsequent studies in these hypomagnesemic families have revealed over a dozen genes directly or indirectly involved in...

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