Transfer of results from reed research into practice as illustrated by reed protection measures in Berlin

AbstractThere is great interest in solving the question of how far the successful establishment of common reed for shore restoration is influenced by genetically determined characteristics of different reed clones. For this purpose, ten reed clones were planted at six artificial sand banks in 1995, according to a special planting design. The growth and expansion performance of the clones was compared.The reed plants grew without significant stress in the first vegetation period, resulting in newly established reed stands in a very good condition at the end of the season. Despite the same site conditions at the experimental plots, the planted clones differed significantly in their morphology and stand structure. By comparison, reed plants of the same clone exhibited strong similarity on all experimental plots. These results appear to justify the assertion that, at least during the initial phase of establishing a reed stand, the development of stand structure is determined more by genetically controlled programmes than by site conditions. Only long-term investigations will be able to clarify to what extent stable stand structures are formed by genetically controlled programmes after polycormons reach maturity

НАДЕЖНОСТЬ КОНВЕЙРНОГО ТРАНСПОРТА

Досліджено питання комплексної надійності функціонування конвеєрних ліній при відкритій розробці корисних копалин. Наведено статистичні закони розподілу для напрацювання на відмову і термінів служби роликових опор для конвеєрних ліній. Побудовано діаграму причин і результатів для системати- зації причин простоїв конвейєрних ліній з переміщення гірської маси в кар'єрах. Исследован вопрос комплексной надежности функционирования конвейерных линий при открытой разра- ботке полезных ископаемых. Приведены статистические законы распределения для наработки на отказ и сроков службы роликовых опор для конвейерных линий. Построена диаграмма причин и результатов для систематизации причин простоев конвейерных линий по перемещению горной массы в карьерах

Un estudio comparativo de actuadores Piezoeléctricos y Magnetoestrictivos para estructuras inteligentes

[EN] This paper introduces a comparative analysis of Piezoelectric (PZ) and Magnetostrictive (MS) actuators as components in smart structures. There is an increasing interest in functional structures which are able to adapt to external or internal perturbations, i.e. changes in loading conditions or ageing. Actuator technologies must perform concomitantly as sensors and actuators to be applicable in smart structures. In this paper we will comparatively analyze the possibility of using PZ and MS actuators in smart structures and in so doing their capability to act concomitantly as sensors and of modifying their material characteristics. We will also focus on the analysis of how them can be integrated in structures and on the analysis of the most appropriate structures for each actuator. The operational performance of PZ (Stacks) and MS actuators will be compared and eventually some conclusions will be drawn.[ES] Este artículo presenta un estudio comparativo de actuadores Piezoeléctricos (PZ) y Magnetoestrictivos (MS) como elementos integrantes de estructuras inteligentes. Existe un interés creciente en estructuras activas que puedan adaptarse a perturbaciones tanto internas como externas, por ejemplo, ante cambios en carga estructural o ante su envejecimiento. Para que un actuador forme parte de una estructura inteligente, debe poder actuar también como sensor. Este artículo presenta un estudio comparativo del uso de actuadores PZ y MS en estructuras inteligentes y, como consecuencia, de su habilidad para actuar y medir simultáneamente así cómo para modificar sus características mecánicas. Nos centraremos también en el análisis de como pueden integrase en estructuras y cuales son las más indicadas para cada actuador. Se compararán las características operacionales de los actuadors PZ multicapa y los MS.Peer reviewe

Технология проведения очистки и диагностики магистрального нефтепровода "Восточная Сибирь-Тихий Океан" с использованием мобильных камер запуска-приема внутритрубных устройств

В выпускной квалификационной работе рассмотрена технология применения мобильных камер запуска-приема очистных устройств и диагностических снарядов на примере трубопровода "Восточная Сибирь - Тихий Океан. Рассчитана необходимая толщина стенки элементов камеры.In the final qualifying work, the technology of using mobile pig trap station was considered using the example of the "Eastern Siberia - Pacific Ocean" pipeline. The required thickness of the wall of the chamber elements was calculated

Гидроимпульсный силовой механизм сваебойной машины в условиях обустройства месторождений

AbstractObjectivesThis study sought to evaluate whether objective assessment of the myocardial functional reserve, using strain rate imaging (SRI), allows accurate detection of viable myocardium.BackgroundStrain rate imaging is a new echocardiographic modality that allows quantitative assessment of segmental myocardial contractility.MethodsIn 37 patients (age 58 ± 9 years) with ischemic left ventricular dysfunction, myocardial viability was assessed using low-dose (10 μg/kg body weight per min) two-dimensional dobutamine stress echocardiography (DSE), tissue Doppler imaging, SRI and 18F-fluorodeoxyglucose (18FDG) positron emission tomography (PET). The peak systolic tissue Doppler velocity and peak systolic myocardial strain rate were determined at baseline and during low-dose dobutamine stress from the apical views.ResultsA total of 192 segments with dyssynergy at rest were classified by 18FDG PET as viable in 94 and nonviable in 98. An increase of peak systolic strain rate from rest to dobutamine stimulation by more than −0.23 1/s allowed accurate discrimination of viable from nonviable myocardium, as determined by 18FDG PET with a sensitivity of 83% and a specificity of 84%. Receiver operating characteristic (ROC) curve analysis showed an area under the curve for prediction of nonviable myocardium, as determined by 18FDG PET using SRI, of 0.89 (95% confidence interval [CI] 0.88 to 0.90), whereas the area under the ROC curve using tissue Doppler imaging was 0.63 (95% CI 0.61 to 0.65).ConclusionsThe increase in the peak systolic strain rate during low-dose dobutamine stimulation allows accurate discrimination between different myocardial viability states. Strain rate imaging is superior to two-dimensional DSE and tissue Doppler imaging for the assessment of myocardial viability