Электропривод регулирующей трубопроводной арматуры на базе синхронного двигателя с постоянными магнитами

Цель работы – создание нового поколения регулирующих взрывозащищенных электроприводов с минимальными габаритными размерами, массой и себестоимостью, не уступающих по точности регулирования и функциональным характеристикам регулирующим электроприводам производства других фирм. В процессе работы был произведен расчет и выбор электропривода. Проведено моделирование и анализ работы привода в разных режимах.The purpose of the work is to create a new generation of regulating explosion-proof electric drives with minimum overall dimensions, weight and cost, which are not inferior in regulation accuracy and functional characteristics to regulating electric drives produced by other companies. During operation electric drive was calculated and selected. Simulation and analysis of the drive operation in different modes were carried out

Measurement of W polarisation at LEP

The three different helicity states of W bosons produced in the reaction e+e- →W+W-→lνqq-' at LEP are studied using leptonic and hadronic W decays. Data at centre-of-mass energies √s = 183-209 GeV are used to measure the polarisation of Wbosons, and its dependence on theWboson production angle. The fraction of longitudinally polarisedWbosons is measured to be 0.218 ± 0.027 ± 0.016 where the first uncertainty is statistical and the second systematic, in agreement with the Standard Model expectation.ISSN:0370-2693ISSN:0031-9163ISSN:1873-244

Search for colour reconnection effects in e+e- -> W+W- -> hadrons through particle-flow studies at LEP

A search for colour reconnection effects in hadronic decays of W pairs is performed with the L3 detector at centre-of-mass energies between 189 and 209 GeV. The analysis is based on the study of the particle flow between jets associated to the sameW boson and between two different W bosons in qqqq events. The ratio of particle yields in the different interjet regions is found to be sensitive to colour reconnection effects implemented in some hadronization models. The data are compared to different models with and without such effects. An extreme scenario of colour reconnection is ruled out.ISSN:0370-2693ISSN:0031-9163ISSN:1873-244