The perception of English-accented polish – a pilot study

•Does familiarity with a specific foreign language facilitate the recognition and identification of that accent in foreign-accented Polish

Ionospheric refraction effects on TOPEX orbit determination accuracy using the Tracking and Data Relay Satellite System (TDRSS)

This investigation concerns the effects on Ocean Topography Experiment (TOPEX) spacecraft operational orbit determination of ionospheric refraction error affecting tracking measurements from the Tracking and Data Relay Satellite System (TDRSS). Although tracking error from this source is mitigated by the high frequencies (K-band) used for the space-to-ground links and by the high altitudes for the space-to-space links, these effects are of concern for the relatively high-altitude (1334 kilometers) TOPEX mission. This concern is due to the accuracy required for operational orbit-determination by the Goddard Space Flight Center (GSFC) and to the expectation that solar activity will still be relatively high at TOPEX launch in mid-1992. The ionospheric refraction error on S-band space-to-space links was calculated by a prototype observation-correction algorithm using the Bent model of ionosphere electron densities implemented in the context of the Goddard Trajectory Determination System (GTDS). Orbit determination error was evaluated by comparing parallel TOPEX orbit solutions, applying and omitting the correction, using the same simulated TDRSS tracking observations. The tracking scenarios simulated those planned for the observation phase of the TOPEX mission, with a preponderance of one-way return-link Doppler measurements. The results of the analysis showed most TOPEX operational accuracy requirements to be little affected by space-to-space ionospheric error. The determination of along-track velocity changes after ground-track adjustment maneuvers, however, is significantly affected when compared with the stringent 0.1-millimeter-per-second accuracy requirements, assuming uncoupled premaneuver and postmaneuver orbit determination. Space-to-space ionospheric refraction on the 24-hour postmaneuver arc alone causes 0.2 millimeter-per-second errors in along-track delta-v determination using uncoupled solutions. Coupling the premaneuver and postmaneuver solutions, however, appears likely to reduce this figure substantially. Plans and recommendations for response to these findings are presented

CF6 High Pressure Compressor and Turbine Clearance Evaluations

In the CF6 Jet Engine Diagnostics Program the causes of performance degradation were determined for each component of revenue service engines. It was found that a significant contribution to performance degradation was caused by increased airfoil tip radial clearances in the high pressure compressor and turbine areas. Since the influence of these clearances on engine performance and fuel consumption is significant, it is important to accurately establish these relatonships. It is equally important to understand the causes of clearance deterioration so that they can be reduced or eliminated. The results of factory engine tests run to enhance the understanding of the high pressure compressor and turbine clearance effects on performance are described. The causes of clearance deterioration are indicated and potential improvements in clearance control are discussed

BIG DATA I WIZUALIZACJA ”KILKA” UWAG O PROBLEMACH I DYLEMATACH WSPÓŁCZESNEGO HISTORYKA HISTORIOGRAFII

The article discusses the main problems of the contemporary history of historiography. The author states that the greatest problem of historiography in the 21st century is big data. The next important issue are the test methods for big data. One of the paradigms, which att empts to explore the world of big data, is digital history. Therefore, the methods of digital history are presented, including its primary method which is data visualization. Finally, the author argues that big data should become the main subject of study of the modern history of historiography.The article discusses the main problems of the contemporary history of historiography. The author states that the greatest problem of historiography in the 21st century is big data. The next important issue are the test methods for big data. One of the paradigms, which att empts to explore the world of big data, is digital history. Therefore, the methods of digital history are presented, including its primary method which is data visualization. Finally, the author argues that big data should become the main subject of study of the modern history of historiography

Qualidade da matéria orgânica do solo de sistema agroflorestal: uma abordagem de avaliação termogravimétrica.

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Zwrot cyfrowy w humanistyce: Internet, Nowe media, Kultura 2.0

Klasyfikacja tematyczna: \u15arodki masowego przekazu; Dost\u119p do kultury. Uczestnictwo w kulturze; Badania nad kultur\u105; Socjologia rozwoju i zmian spo\u142ecznyc

Produção, conteúdo de nutrientes e estoque de carbono da serapilheira em sistema silvipastoril com Corymbia citriodora.

O presente trabalho teve por objetivo analisar a produção e o conteúdo de nutrientes da serapilheira existente em uma área de pastagem arborizada com o eucalipto Corymbia citriodora. A pesquisa foi conduzida em uma propriedade localizada na região Noroeste do Paraná. As coletas do material foram efetuadas a diferentes distâncias das árvores, sendo identificado o percentual de contribuição das árvores na produção total de serapilheira. Com base na quantidade de matéria seca e dos teores de C e nutrientes foi calculada uma estimativa da quantidade destes elementos aportados pela serapilheira, por hectare