Wire stripper

An insulation stripper is described which is especially useful for shielded wire, the stripper including a first pair of jaws with blades extending substantially perpendicular to the axis of the wire, and a second pair of jaws with blades extending substantially parallel to the axis of the wire. The first pair of jaws is pressed against the wire so the blades cut into the insulation, and the device is turned to form circumferential cuts in the insulation. Then the second pair of jaws is pressed against the wire so the blades cut into the insulation, and the wire is moved through the device to form longitudinal cuts that permit easy removal of the insulation. Each of the blades is located within the concave face of a V-block, to center the blades on the wire and to limit the depth of blade penetration

Air speed and attitude probe

An air speed and attitude probe characterized by a pivot shaft normally projected from a data boom and supported thereby for rotation about an axis of rotation coincident with the longitudinal axis of the shaft is described. The probe is a tubular body supported for angular displacement about the axis of rotation and has a fin mounted on the body for maintaining one end of the body in facing relation with relative wind and has a pair of transducers mounted in the body for providing intelligence indicative of total pressure and static pressure for use in determining air speed. A stack of potentiometers coupled with the shaft to provide intelligence indicative of aircraft attitude, and circuitry connecting the transducers and potentiometers to suitable telemetry circuits are described

Fearn v Board of Trustees of the Tate Gallery: A Lost Opportunity for the UK's Protection of Physical Privacy

The inadequacies of English common and statutory law have left a noticeable gap in the UK's protection of physical privacy. Mann J's 2019 decision in Fearn v Board of Trustees of the Tate Gallery helped fill this gap as it acknowledged that overlooking between neighbours could constitute an actionable nuisance. A year later, the Court of Appeal reversed this development and reaffirmed that private nuisance cannot be used to combat breaches of privacy. This article evaluates the extent to which the High Court decision in Fearn was a useful and desirable tool for defending physical privacy in order to assess the correctness of the appellate decision. The article contends that Mann J's extension was a justified development as it conformed with precedent, the scheme and principles of private nuisance, the text and horizontal effect of art 8 of the Convention for the Protection of Human Rights and Fundamental Freedoms, cases decided in the European Court of Human Rights, and broader policy. However, the article acknowledges that Fearn was also a problematic development with limited potential as a protection mechanism. Its limitations arose from the conflict between traditional understandings of the right to privacy and nuisance's association with property, the land-based rationale for compensation in nuisance, the standing restrictions retained from Hunter v Canary Wharf Ltd, irregularities with the common law's favourable attitude towards children's privacy, and Fearn's similarities to anti-harassment legislation. Overall, the article concludes that although Fearn was imperfect in its treatment of physical privacy, it was a step in the right direction and contributed at least partially to filling the persistent lacuna in English privacy law

Incidence and risk factors for feline lymphoma in UK primary-care practice

Objectives: The study aimed to estimate the incidence and prevalence of feline lymphoma in cats attending primary-care practices across the UK and to identify patient-based and environmental (radon and pesticide exposure) risk factors. Materials and methods: Case records from the VetCompassTM programme from primary-care veterinary practices in the UK were searched for a diagnosis of lymphoma in cats in 2016. Cases were required to have had an external laboratory confirmed diagnosis based on cytology and/or histopathology. A nested case-control study design was used to identify risk factors for lymphoma using multivariable logistic regression. Results: From a cohort of 562,446 cats under veterinary care at VetCompass participating practices in 2016, a total of 271 lymphoma cases were identified (prevalence: 48/100,000, 95% CI 44- 56/100,000; incidence 32/100,000, 95% CI 26- 35/100,000). There was 180 incident lymphoma cases and 803 controls, all aged 2 years and older. Male (OR 1.7, 95% CI 1.2-2.4, P=0.004), insured (OR 3.6, 95% CI 2.3-5.6, P=<0.001) and older cats (compared to cats 2 to <5 years, OR 5.0, 95% CI 2.8- 8.8, P=<0.001) were associated with increased odds of lymphoma diagnosis. Vaccinated cats were associated with decreased odds (OR 0.7, 95% CI 0.5-1.0, P=0.054) compared to unvaccinated cats, although the type of vaccination received was not statistically significant (P=0.258). Breed and environmental factors studied were not associated with a diagnosis of lymphoma. Clinical significance: This is the first study to estimate the frequency and report risk factors r lymphoma in cats attending UK primary-care practice

Theory of coherent transport by an ultra-cold atomic Fermi gas through linear arrays of potential wells

Growing interest is being given to transport of ultra-cold atomic gases through optical lattices generated by the interference of laser beams. In this connection we evaluate the phase-coherent transport of a spin-polarized gas of fermionic atoms along linear structures made from potential wells set in four alternative types of sequence. These are periodic chains of either identical wells or pairs of different wells, and chains of pairs of wells arranged in either a Fibonacci quasi-periodic sequence or a random sequence. The transmission coefficient of fermionic matter is evaluated in a T-matrix scattering approach by describing each array through a tight-binding Hamiltonian and by reducing it to an effective dimer by means of a decimation/renormalization method. The results are discussed in comparison with those pertaining to transport by Fermi-surface electrons coupled to an outgoing lead and by an atomic Bose-Einstein condensate. Main attention is given to (i) Bloch oscillations and their mapping into alternating-current flow through a Josephson junction; (ii) interference patterns that arise on period doubling and their analogy with beam splitting in optical interferometry; (iii) localization by quasi-periodic disorder inside a Fibonacci-ordered structure of double wells; and (iv) Anderson localization in a random structure of double wells.Comment: 14 pages, 4 figure

Holstein model in infinite dimensions at half-filling

The normal state of the Holstein model is studied at half-filling in infinite dimensions and in the adiabatic regime. The dynamical mean-field equations are solved using perturbation expansions around the extremal paths of the effective action for the atoms. We find that the Migdal-Eliashberg expansion breaks down in the metallic state if the electron-phonon coupling $\lambda$ exceeds a value of about 1.3 in spite of the fact that the formal expansion parameter $\lambda \omega_0/E_F$ ($\omega_0$ is the phonon frequency, $E_F$ the Fermi energy) is much smaller than 1. The breakdown is due to the appearance of more than one extremal path of the action. We present numerical results which illustrate in detail the evolution of the local Green's function, the self-energy and the effective atomic potential as a function of $\lambda$.Comment: Revtex + 17 postscript figures include

Towards coherent optical control of a single hole spin: rabi rotation of a trion conditional on the spin state of the hole

A hole spin is a potential solid-state q-bit, that may be more robust against nuclear spin induced dephasing than an electron spin. Here we propose and demonstrate the sequential preparation, control and detection of a single hole spin trapped on a self-assembled InGaAs/GaAs quantum dot. The dot is embedded in a photodiode structure under an applied electric field. Fast, triggered, initialization of a hole spin is achieved by creating a spin-polarized electron-hole pair with a picosecond laser pulse, and in an applied electric field, waiting for the electron to tunnel leaving a spin-polarized hole. Detection of the hole spin with picoseconds time resolution is achieved using a second picosecond laser pulse to probe the positive trion transition, where a trion is created conditional on the hole spin being detected as a change in photocurrent. Finally, using this setup we observe a Rabi rotation of the hole-trion transition that is conditional on the hole spin, which for a pulse area of 2 pi can be used to impart a phase shift of pi between the hole spin states, a non-general manipulation of the hole spin. (C) 2009 Elsevier Ltd. All rights reserved

Numerical Analysis of the Anderson Localization

The aim of this paper is to demonstrate, by simple numerical simulations, the main transport properties of disordered electron systems.Comment: submitted to acta physica slovac

Scores radiologiques destinés à la pratique courante dans le cadre du suivi des patients atteints d'une polyarthrite rhumatoïde

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