Hie-Isolde High Beta Cavity Study and Measurements

The upgrade of the ISOLDE machine at CERN foresees a superconducting linac based on two gap independently phased Nb sputtered Quarter Wave Resonators (QWRs) working at 101.28MHz and producing an accelerating field of 6MV/m on axis. A careful study of the fields in the cavity has been carried out in order to pin down the crucial e-m parameters of the structure such as peak fields, quality factor and e-m power dissipated on the cavity wall. A tuning system with about 200kHz frequency range has been developed in order to cope with fabrication tolerances. In this paper we will report on the cavity simulations. The tuning plate design will be described. Finally the frequency measurements on a cavity prototype at room temperature will be presented.Comment: 5 pages, SRF09 Conference in Berli

Beam Dynamics Studies for the HIE-ISOLDE Linac at CERN

The upgrade of the normal conducting (NC) Radioactive Ion Beam EXperiment (REX)-ISOLDE heavy ion accelerator at CERN, under the High Intensity and Energy (HIE)-ISOLDE framework, proposes the use of superconducting (SC) quarter-wave resonators (QWRs) to increase the energy capability of the facility from 3 MeV/u to beyond 10 MeV/u. A beam dynamics study of a lattice design comprising SC QWRs and SC solenoids has confirmed the design's ability to accelerate ions, with a mass-to-charge ratio in the range 2.5 < A/q < 4.5, to the target energy with a minimal emittance increase. We report on the development of this study to include the implementation of realistic fields within the QWRs and solenoids. A preliminary error study is presented in order to constrain tolerances on the manufacturing and alignment of the linac.Comment: 3 pages, 8 figures, 1 table, submitted to the Particle Accelerator Conference (PAC) 2009 in Vancouver. Page formatting changed to US letter siz

Efficient Coherent Control by Optimized Sequences of Pulses of Finite Duration

Reliable long-time storage of arbitrary quantum states is a key element for quantum information processing. In order to dynamically decouple a spin or quantum bit from a dephasing environment, we introduce an optimized sequence of $N$ control pulses of finite durations \tau\pp and finite amplitudes. The properties of this sequence of length $T$ stem from a mathematically rigorous derivation. Corrections occur only in order $T^{N+1}$ and \tau\pp^3 without mixed terms such as T^N\tau\pp or T^N\tau\pp^2. Based on existing experiments, a concrete setup for the verification of the properties of the advocated realistic sequence is proposed.Comment: 8 pages, 1 figur

Metodologia para evidenciar danos mecânicos gerados por atrito em peras.

Dada a importância dos danos mecânicos por atrito na qualidade de peras, este Comunicado Técnico tem por objetivo propor métodos capazes de evidenciar as lesões por atrito e estabelecer escalas de severidade para fins de avaliação desse tipo de dano nos procedimentos de colheita e pós-colheita de peras.bitstream/item/81766/1/ANTONIOLLI-ComTecn127-Metodologia-para-Evidenciar-Danos-Mecanicos-Gerados-por-Atrito-em-Peras-2012.pd

Critical points and magnitude of impacts on the packing line: effect on ripening and quality of "Packham?s Triumph" pears.

Pears have a very sensitive epidermis and are prone to signal mechanical blemishes, which result in reduced visual quality and low consumer acceptance. The objective of this work was to identify critical points and the magnitude of impact forces on a packing line at a commercial packinghouse. The effect of injuries on ripening and quality of ´Packham´s Triumph´ pears was also evaluated after cold storage. The packing line was scrutinized on its transfer points, fruit drop heights and cushioning overlays, which allowed to acquire the maximum accelerations on each spot. The maximum acceleration forces were reproduced in the lab with ‘Packham’s Triumph’ pears to evaluate the effects on fruit quality after cold storage. Four critical points were noticed on the packing line: at the transfer from the conveyor belt to the lifting rollers, at the transfer from the lifting rollers to the washing ramp with rotatory brushes, at the entrance to the singulator at the end of the conveyor belt and at the drop from the sizer to the packing stalls. Ripening of ‘Packham’s Triumph’ pears invariably came about during cold storage, and independently of the imposed impacts. The impacts under the circumstances of the test did not affect the quality of ´Packham´s Triumph´ pears kept for up to 120 days at cold storage followed by five days at room temperature. Key words: Pyrus communis L. G forces. Mechanical injuries. Packing line. Peras apresentam epiderme muito sensível e são propensas aos sinais de danos mecânicos, que resultam em qualidade visual reduzida e baixa aceitação dos consumidores. O objetivo deste trabalho foi identificar os pontos críticos e a magnitude dos impactos em uma linha de beneficiamento e classificação de frutas em uma casa de embalagem comercial. Também foi avaliado o efeito das lesões sobre o amadurecimento e a qualidade de peras ‘Packham’s Triumph’, mantidas sob refrigeração. A linha de beneficiamento e classificação foi avaliada quanto aos pontos de transferência, altura de queda das frutas e material de superfície de queda, permitindo obter a aceleração máxima em cada ponto. Os valores de aceleração máxima foram reproduzidos em laboratório com peras ‘Packham’s Triumph’, para avaliar seus efeitos na qualidade das frutas após armazenamento refrigerado. Quatro pontos críticos foram observados na linha de beneficiamento e classificação: da esteira rolante para o elevador de roletes, do elevador de roletes para a rampa de lavagem com escovas rotativas, na entrada do singulador, ao final da esteira rolante, e na queda do calibrador para a mesa de embalagem. Durante o armazenamento refrigerado ocorreu o amadurecimento de peras ‘Packham’s Triumph’, independente do tratamento de dano mecânico por impacto aplicado. Os danos mecânicos por impacto, nas condições testadas, não afetam a qualidade de peras ‘Packham’s Triumph’ mantidas por até 120 dias de refrigeração, seguidos por cinco dias em temperatura ambiente. Palavras-chave: Pyrus communis L. Força G. Injúria mecânica. Linha de classificação e beneficiamento

Malnutrition and Gut Flora dysbiosis: specific therapies for emerging comorbidities in heart failure

Chronic heart failure is a complicated multifactorial disease with wide-spread social-economic consequences. In spite of the recent development of new drugs and therapeutic strategies, CHF-related mortality and morbidity remain high. Recent evidence suggests that changes in organs such as skeletal muscle and gut flora may play an important and independent role in CHF prognosis. This paper illustrates these phenomena, proposing how to identify them and presenting current therapies which treat organs all too often underestimated but which have a fundamental role in worsening CHF

Energy-based predictions in Lorenz system by a unified formalism and neural network modelling

In the framework of a unified formalism for Kolmogorov-Lorenz systems, predictions of times of regime transitions in the classical Lorenz model can be successfully achieved by considering orbits characterised by energy or Casimir maxima. However, little uncertainties in the starting energy usually lead to high uncertainties in the return energy, so precluding the chance of accurate multi-step forecasts. In this paper, the problem of obtaining good forecasts of maximum return energy is faced by means of a neural network model. The results of its application show promising results

Optimized Dynamical Decoupling for Time Dependent Hamiltonians

The validity of optimized dynamical decoupling (DD) is extended to analytically time dependent Hamiltonians. As long as an expansion in time is possible the time dependence of the initial Hamiltonian does not affect the efficiency of optimized dynamical decoupling (UDD, Uhrig DD). This extension provides the analytic basis for (i) applying UDD to effective Hamiltonians in time dependent reference frames, for instance in the interaction picture of fast modes and for (ii) its application in hierarchical DD schemes with $\pi$ pulses about two perpendicular axes in spin space. to suppress general decoherence, i.e., longitudinal relaxation and dephasing.Comment: 5 pages, no figure

Postharvest quality of "Rama Forte" persimmon stored at passive modified atmosphere packaging.

"Rama Forte" persimmon presents a short shelf life after harvesting and during commercialization. The objective of this work was evaluate quality of "Rama Forte" persimmon conditioned under modified atmosphere and kept under refrigeration.Sessão de Pôste