1,406 research outputs found

    Literature in French and Chinese language teaching and learning supported by the use of Internet and digital resources

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    The paper looks at the study of literature in the foreign languages classroom and examines how the use of the internet and digital resources can facilitate this. Foreign language learners can learn a lot more than the instrumental functions of a target language by appreciating the literature. Examples from French and Mandarin Chinese literature will be used to illustrate the argument

    Mandarin Chinese Teacher Education Issues and solutions

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    Mandarin Chinese is the most widely spoken language in the world, and in a rapidly globalizing environment, speaking it is an increasingly important skill for young people in the UK. 'Mandarin Chinese Teacher Education' stems from the work of the UCL Institute of Education Confucius Institute, which supports the development of Mandarin Chinese as a language on offer in schools as part of the mainstream curriculum. This edited collection brings together researchers, teachers involved in action research and student-teachers, in an effort to address the current lack of literature specifically aimed at supporting Chinese language teachers. It features: • practical ideas for teachers of Chinese to implement in their own classrooms • evaluation of differing strategies and approaches unique to teaching Chinese • examples of using action research to help teachers reflect on their own practice while informing practice across the discipline. The book will be useful for PGCE Mandarin students, teacher trainers and those involved in the development of Mandarin Chinese in schools across the UK and further afield

    Criticality, Fractality and Intermittency in Strong Interactions

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    Assuming a second-order phase transition for the hadronization process, we attempt to associate intermittency patterns in high-energy hadronic collisions to fractal structures in configuration space and corresponding intermittency indices to the isothermal critical exponent at the transition temperature. In this approach, the most general multidimensional intermittency pattern, associated to a second-order phase transition of the strongly interacting system, is determined, and its relevance to present and future experiments is discussed.Comment: 15 pages + 2 figures (available on request), CERN-TH.6990/93, UA/NPPS-5-9

    Random and Correlated Phases of Primordial Gravitaional Waves

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    The phases of primordial gravity waves is analysed in detail within a quantum mechanical context following the formalism developed by Grishchuk and Sidorov. It is found that for physically relevant wavelengths both the phase of each individual mode and the phase {\it difference} between modes are randomly distributed. The phase {\it sum} between modes with oppositely directed wave-vectors, however, is not random and takes on a definite value with no rms fluctuation. The conventional point of view that primordial gravity waves appear after inflation as a classical, random stochastic background is also addressed.Comment: 14 pages, written in REVTE

    Reconstructed CKM Matrices

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    We construct quark mixing matrices within a group theoretic framework which is easily applicable to any number of generations. Familiar cases are retrieved and related, and it is hoped that our viewpoint may have advantages both phenomenologically and for constructing underlying mass matrix schemes.Comment: 15 pages,LaTeX,no macro

    Phase Operator for the Photon Field and an Index Theorem

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    An index relation dim ker aadim ker aa=1dim\ ker\ a^{\dagger}a - dim\ ker\ aa^{\dagger} = 1 is satisfied by the creation and annihilation operators aa^{\dagger} and aa of a harmonic oscillator. A hermitian phase operator, which inevitably leads to dim ker aadim ker aa=0dim\ ker\ a^{\dagger}a - dim\ ker\ aa^{\dagger} = 0, cannot be consistently defined. If one considers an s+1s+1 dimensional truncated theory, a hermitian phase operator of Pegg and Barnett which carries a vanishing index can be defined. However, for arbitrarily large ss, we show that the vanishing index of the hermitian phase operator of Pegg and Barnett causes a substantial deviation from minimum uncertainty in a characteristically quantum domain with small average photon numbers. We also mention an interesting analogy between the present problem and the chiral anomaly in gauge theory which is related to the Atiyah-Singer index theorem. It is suggested that the phase operator problem related to the above analytic index may be regarded as a new class of quantum anomaly. From an anomaly view point ,it is not surprising that the phase operator of Susskind and Glogower, which carries a unit index, leads to an anomalous identity and an anomalous commutator.Comment: 32 pages, Late

    Calmodulin-like proteins localized to the conoid regulate motility and cell invasion by Toxoplasma gondii

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    Toxoplasma gondii contains an expanded number of calmodulin (CaM)-like proteins whose functions are poorly understood. Using a combination of CRISPR/Cas9-mediated gene editing and a plant-like auxin-induced degron (AID) system, we examined the roles of three apically localized CaMs. CaM1 and CaM2 were individually dispensable, but loss of both resulted in a synthetic lethal phenotype. CaM3 was refractory to deletion, suggesting it is essential. Consistent with this prediction auxin-induced degradation of CaM3 blocked growth. Phenotypic analysis revealed that all three CaMs contribute to parasite motility, invasion, and egress from host cells, and that they act downstream of microneme and rhoptry secretion. Super-resolution microscopy localized all three CaMs to the conoid where they overlap with myosin H (MyoH), a motor protein that is required for invasion. Biotinylation using BirA fusions with the CaMs labeled a number of apical proteins including MyoH and its light chain MLC7, suggesting they may interact. Consistent with this hypothesis, disruption of MyoH led to degradation of CaM3, or redistribution of CaM1 and CaM2. Collectively, our findings suggest these CaMs may interact with MyoH to control motility and cell invasion

    Quark-hadron phase transition with surface fluctuation

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    The effect of surface fluctuation on the observables of quark-hadron phase transition is studied. The Ginzburg-Landau formalism is extended by the inclusion of an extra term in the free energy that depends on the vertical displacements from a flat surface. The probability that a bin has a particular net displacement is determined by lattice simulation, where the physics input is color confinement. The surface fluctuation from bin to bin is related to multiplicity fluctuation, which in turn is measured by the factorial moments. It is found that both the F-scaling behavior and the scaling exponent are essentially unaffected by the inclusion of surface fluctuation.Comment: 9 pages, LaTex, 7 figures in a single postscript file, submitted to Phys. Rev.

    Intrinsic response time of graphene photodetectors

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    Graphene-based photodetectors are promising new devices for high-speed optoelectronic applications. However, despite recent efforts, it is not clear what determines the ultimate speed limit of these devices. Here, we present measurements of the intrinsic response time of metal-graphene-metal photodetectors with monolayer graphene using an optical correlation technique with ultrashort laser pulses. We obtain a response time of 2.1 ps that is mainly given by the short lifetime of the photogenerated carriers. This time translates into a bandwidth of ~262 GHz. Moreover, we investigate the dependence of the response time on gate voltage and illumination laser power

    Studies of multiplicity in relativistic heavy-ion collisions

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    In this talk I'll review the present status of charged particle multiplicity measurements from heavy-ion collisions. The characteristic features of multiplicity distributions obtained in Au+Au collisions will be discussed in terms of collision centrality and energy and compared to those of p+p collisions. Multiplicity measurements of d+Au collisions at 200 GeV nucleon-nucleon center-of-mass energy will also be discussed. The results will be compared to various theoretical models and simple scaling properties of the data will be identified.Comment: "Focus on Multiplicity" Internationsl Workshop on Particle Multiplicity in Relativistic Heavy Ion Collisions, Bari, Italy, June 17-19, 2003, 16 pages, 15 figure
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