Melhorias de processos, fluxos e canais para comunicação interna: uma análise de caso da Embrapa Caprinos e Ovinos.

Resumo: O artigo traz resultados premilinares da implantação do projeto ?Comunicação Interna na Embrapa Caprinos e Ovinos - melhorias de processo, fluxos e canais?, implementado naquela unidade da empresa, situada em Sobral (CE). Na abordagem, estão presentes a caracterização de problemas de comunicação interna que originaram o projeto e a fundamentação teórica de suas ações, em alinhamento com ideias de orientação estratégica para comunicação interna e com valores e diretrizes para uma comunicação interna que se pretende eficiente, democrática e plural

Análise de canais, fluxos e protagonismos: um estudo de caso sobre a comunicação interna na Embrapa caprinos e ovinos.

Resumo: O artigo traça uma avaliação de projeto de Comunicação Interna na Embrapa Caprinos e Ovinos, observando o impacto das mudanças em canais, veículos e processos de comunicação, por meio da pesquisa junto ao público interno da entidade. Como destaque, os resultados de satisfação e sugestões dos colaboradores, analisados sob a ótica de correntes teóricas da Comunicação Organizacional, para verificar o cumprimento de premissas de uma comunicação interna participativa e de diálogo, prevista como objetivo do projeto

Corrections to Finite Size Scaling in Percolation

A 1/L-expansion for percolation problems is proposed, where L is the lattice finite length. The square lattice with 27 different sizes L = 18, 22 ... 1594 is considered. Certain spanning probabilities were determined by Monte Carlo simulations, as continuous functions of the site occupation probability p. We estimate the critical threshold pc by applying the quoted expansion to these data. Also, the universal spanning probability at pc for an annulus with aspect ratio r=1/2 is estimated as C = 0.876657(45)

Procedure for determination and setting of thresholds implemented in the LHCb Muon system

The LHCb Muon system consists of 1368 Multi Wire Proportional Chambers of different size and readout for a total of ~120k electronics channels. The choice of the correct threshold to be applied to each channel can be made on the basis of the detector simulation or, as we suggest in this note, by measuring the noise parameters for each channel and consequently setting the desired values. When dealing with individual channels of the Muon system, the variations of the specific properties of each CARIOCA channel should be properly taken into account in order to fine tune the thresholds. The discriminator stage of the CARIOCA is characterized by a voltage bias that needs to be properly measured and taken into account in the threshold calculations. The procedure used for such calculations for the physical channels of the Muon system is discussed in detail in this note

Measurement system for evaluation of the muon chambers for the LHCb experiment

Abstract In a detector with the complexity of the LHCb, where only for the muon system more than 1300 chambers, divided into 20 different types, will be used, resulting on more than 120 k channels to be readout, it is of crucial importance to study the many types of chambers to create a complete knowledge of the detector operation and to guarantee a high-quality performance during the experiment. To make it possible, a complete setup was built and a C++ based software was developed to carry out a set of measurements on the full-equipped chambers of the LHCb muon detector. The setup is made of front-end control electronics, high-voltage supply and acquisition circuitry while the software, running on a PC, remotely controls each element of the system and implements a number of automatized procedures to assess the main characteristics of the chambers. The main advantages of this system are its versatility and speed of measurement which are crucial to the experiment since there is the need to characterize every single chamber before final installation. Moreover, in this work it was proposed to measure the starting knee of the high-voltage operational plateau without the use of an external trigger by making use of the internal structure of the chambers. Two laboratories were prepared at CERN (European Laboratory for Particle Physics) to receive this system; one used to test chambers arrived from the CERN itself and the PNPI (Petersburg Nuclear Physics Institute) production sites, and one to test the chambers arrived from the INFN (National Institute of Nuclear Physics) production sites. In this document, the hardware and software setup will be presented together with the measurement-oriented implementations

A new method based on noise counting to monitor the frontend electronics of the LHCb muon detector

A new method has been developed to check the correct behaviour of the frontend electronics of the LHCb muon detector. This method is based on the measurement of the electronic noise rate at different thresholds of the frontend discriminator. The method was used to choose the optimal discriminator thresholds. A procedure based on this method was implemented in the detector control system and allowed the detection of a small percentage of frontend channels which had deteriorated. A Monte Carlo simulation has been performed to check the validity of the method

Front-end Electronics Test for the LHCb Muon Wire Chambers

This document describes the apparatus and procedures implemented to test Multi Wire Proportional Chambers (MWPC) after front-end assembly for the LHCb Muon Detector. Results of measurements of key noise parameters are also described. Given a fully equipped chamber, this system is able to diagnose every channel performing an analysis of front-end output drivers’ response and noise rate versus threshold. Besides, it allows to assess if the noise rate at the experiment threshold region is within appropriate limits. Aiming at an automatic, fast and user-friendly system for mass production tests of MWPC, the project has foreseen as well electronic identification of every chamber and front-end board, and data archiving in such a way to make it available to the Experiment Control System (ECS) while in operation