Tagging High Energy Photons in the H1 Detector at HERA

Measures taken to extend the acceptance of the H1 detector at HERA for photoproduction events are described. These will enable the measurement of electrons scattered in events in the high y range 0.85 < y < 0.95 in the 1998 and 1999 HERA run period. The improvement is achieved by the installation of an electromagnetic calorimeter, the ET8, in the HERA tunnel close to the electron beam line 8 m downstream of the H1 interaction point in the electron direction. The ET8 will allow the study of tagged gamma p interactions at centre-of-mass energies significantly higher than those previously attainable. The calorimeter design and expected performance are discussed, as are results obtained using a prototype placed as close as possible to the position of the ET8 during the 1996 and 1997 HERA running.Comment: 13 pages, 13 figure

A New High Energy Photon Tagger for the H1 - Detector at HERA

The H1 detector at HERA has been upgraded by the addition of a new electromagnetic calorimeter. This is installed in the HERA tunnel close to the electron beam line at a position 8m from the interaction point in the electron beam direction. The new calorimeter extends the acceptance for tagged photoproduction events to the high y range, 0.85 < y < 0.95, and thus significantly improves the capability of H1 to study high energy gamma-p processes. The calorimeter design, performance and first results obtained during the 1996-1999 HERA running are described.Comment: 17 pages, 16 figure

The impact of internet technology on the cognitive activities of students

The article explores the main approaches to researching the impact of Internet technologies, including the features of modern online education, on the cognitive activities of young students. The dynamics of cognitive processes: attention and memory are analyzed in students, which are the active Internet users, as well as the impact of the online environment on social cognitive responseВ статье рассмотрены основные подходы к исследованию влияния интернет-технологий, включая особенности современного онлайн-образования, на когнитивную деятельность учащейся молодежи. Проанализирована динамика когнитивных процессов: внимания и памяти у студентов и учащихся — активных пользователей Интернета, а также влияние онлайн-среды на социальное когнитивное реагирование

Использование технологии разведочного анализа данных – “деревьев классификации” для дифференциальной диагностики типа очагового новообразования в печени при ультразвуковом исследовании с применением метода эластографии сдвиговой волной

The aim: study the possibility of using data elastometry hearth tumors in the liver parenchyma and “unchanged” the liver parenchyma in this patient for the differential diagnosis of tumors in premorphological diagnostic stage.Materials and Methods. 46 patients with liver tumor underwent ultrasound. The stiffness (elastometry)of the tissues in the tumor and intact liver parenchyma was studied. The ultrasound data were compared with the results of morphological studies, obtained by biopsy. Statistical methods for the study included analysis of variance, and to develop decision rules determine the type of tumor formation method of classification of trees applied.Results. During the work we have been able to implement a new approach to the differential diagnosis of focal liver formations based on the simultaneous study of rigidity not only the pathological focus, but also the “intact” parenchyma, lying outside the chamber and away from the capsule of the body. Conclusion. The algorithm allows, based on the measurement of Young’s modulus in the pathological focus in the “intact” parenchyma of the liver to make the conclusion about the nature of the neoplasm.Цель исследования: изучение возможности использования данных эластометрии очага новообразования в паренхиме печени и “неизмененной” паренхимы печени у данного пациента для дифференциальной диагностики характера новообразования на доморфологическом этапе диагностики.Материал и методы. УЗИ проведено 46 пациентам с очаговыми образованиями печени. Изучали жесткость тканей (эластометрия) в очаге опухоли и в неизмененной паренхиме печени. Данные УЗИ сравнивали с результатами морфологических исследований, полученных при биопсии. Статистические методы исследования включали дисперсионый анализ, для разработки решающих правил определения типа опухолевого образования применен метод “деревьев классификации”.Результаты. В ходе работы нам удалось реализовать новый подход к дифференциальной диагностике очаговых образований печени, основанный на одновременном изучении жесткости не только патологического очага, но и “интактной” паренхимы печени, лежащей вне очага и вдали от капсулы данного органа.Заключение. Представленный алгоритм позволяет на основе измерения модуля Юнга в патологическом очаге и в “интактной” паренхиме печени сделать заключение о характере новообразования

Characteristic features of damage of coronary arteries in patients with primary ST-elevation myocardial infarction

The aim of the study - to assess the angiographic features of the state of the coronary arteries in primary myocardial infarction with ST segment elevation.Цель исследования - оценить ангиографические особенности состояния коронарных артерий у больных первичным инфарктом миокарда с подъёмом сегмента S

The palpitation felt in patients during an angina pain points a low probability of obstructive coronary atherosclerosis

The purpose of the study is to evaluate the diagnostic significance of the heartbeat, which patients feel during an angina attack, in relation to obstructive coronary atherosclerosis.Цель исследования – оценить диагностическую значимость сердцебиения, ощущаемого пациентами во время приступа стенокардии, в отношении обструктивного коронарного атеросклероза

Particles as probes for complex plasmas in front of biased surfaces

An interesting aspect in the research of complex (dusty) plasmas is the experimental study of the interaction of micro-particles with the surrounding plasma for diagnostic purposes. Local electric fields can be determined from the behaviour of particles in the plasma, e.g. particles may serve as electrostatic probes. Since in many cases of applications in plasma technology it is of great interest to describe the electric field conditions in front of floating or biased surfaces, the confinement and behaviour of test particles is studied in front of floating walls inserted into a plasma as well as in front of additionally biased surfaces. For the latter case, the behaviour of particles in front of an adaptive electrode, which allows for an efficient confinement and manipulation of the grains, has been experimentally studied in dependence on the discharge parameters and on different bias conditions of the electrode. The effect of the partially biased surface (dc, rf) on the charged micro-particles has been investigated by particle falling experiments. In addition to the experiments we also investigate the particle behaviour numerically by molecular dynamics, in combination with a fluid and particle-in-cell description of the plasma.Comment: 39 pages, 16 figures, submitted to New J. Phy