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

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

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

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

Comparison of web application performance on the example of Laravel and Vaadin frameworks

The article presents the result of comparing the performance of web applications written with the use of Laravel and Vaadin frameworks. The aim of the study was to identify which framework offers better performance in creating web applications and to verify the thesis presented in the article. A research method based on a comparative analysis was used to conduct the study. The study was carried out using two applications created for the purpose of the study and tools such as ApacheBench and Chrome DevTools were used for the study. Tests were carried out according to 13 research scenarios and the obtained results allowed to clearly verify the thesis. Finally, it was concluded that Vaadin is a much more efficient framework than Laravel

PERCEPTIONS OF SUPPORT, LIKELIHOOD OF RETENTION, AND DIFFERENCES BETWEEN PLACES OF ORIGIN AMONG FIRST-GENERATION COLLEGE STUDENTS

First-generation college students are less likely to attend and complete college than their peers whose parents have completed college. Among the reasons cited for this disparity is lack of parental familiarity of the college admissions process and financial aid opportunities. First-generation youth wishing to pursue a college education must rely on others for this knowledge. This study examines first-generation college students\u27 perceptions of support and whether their places of origin have any bearing on their future plans. The study examines interviews with participants through the lens of Tinto\u27s (1993) model of student departure to examine whether their responses, and whether their places of origin, point toward likelihood of student retention. This study finds that students cite parents and high school faculty and staff as most supportive when preparing for college. After arriving in college, there are no differences among students based on place of origin and likelihood of retention. Participation in a retention program appears to help the students meet the criteria for student retention as outlined by Tinto\u27s model

Carbonate sedimentology and carbon isotope stratigraphy of the Tallbacken-1 core, early Wenlock Slite Group, Gotland, Sweden

Den mer än 700 m mäktiga lagerföljden på Gotland är erosionsresterna av vidsträckta karbonatplattformar som bildades i den Baltiska bassängen under silurperioden. Detta arbete fokuserar på stratigrafin och bergarterna i borrkärnan Tallbacken-1 som togs upp vid Stora Vede av Sveriges geologiska undersökning år 2006. Analys av kalkstenens mikrofacies tillsammans med analys av geofysiska data (gamma ray) från borrhålet ligger till grund för tolkning av depositionsmiljön och utvecklingen av karbonatplattformen under motsvarande tidsintervall. Fem identifierade mikrofaciesassociationer motsvarar fem olika depositionsmiljöer. Dessa representerar i stigande ordning genom kärnan: lågenergi yttre ramp, moderat energi mellersta ramp, högenergi revfront, hög energi revbälte och en lagunmiljö, dvs en uppgrundningssekvens till följd av revbältets progradering genom bassängen. Denna uppgrundning är avbruten av småskalig karstbildning. Utöver mikrofaciesanalys samlades 176 prover in från kärnan för δ13C-analys. Dessa data indikerar att basen av Tallbacken-1 kärnan stratigrafiskt ligger mycket nära gränsen mellan Hangvarformationen och Slitegruppen och att den senare delen av Ireviken Event (återhämtningsfasen) möjligen kan studeras i kärnans lägsta del.The more than 700 m thick carbonate succession of Gotland represents the erosional remnants of a vast carbonate platform system that formed in the Baltic basin during the Silurian Period. This thesis focuses on the stratigraphy and carbonate microfacies of the Tallbacken-1 core that was drilled at Stora Vede by the Swedish Geological Survey in 2006. Carbonate microfacies analysis of the core along with gamma ray log data from the well form basis for interpretation on the depositional environment for the rocks and the evolution of the carbonate platform complex through the corresponding time interval. The five recognized carbonate microfacies associations correspond to five depositional environments. This can be seen in the following ascending order in the core: low energy outer ramp, moderate energy middle ramp, high energy reef slope, high energy reef belt and a relatively low energy lagoonal setting. In addition, 176 whole-rock samples were collected and used for δ13C analysis to constrain the stratigraphy of the core due to the lack of biostratigraphic data. The identification of the Early Sheinwoodian Isotope Carbon Excursion (ESCIE) in the δ13C data suggests that the base of the Tallbacken-1 core belongs predominantly in the lowermost Slite Group and that the bottom of the core is possibly close to the Hangvar Formation-Slite Group boundary. The deposition of these strata corresponds in time with the later parts of the Ireviken Event. Microfacies analysis reveals a carbonate platform that prograded into deeper waters and was terminated by a relative sea-level lowstand when minor karstification occurred