Wyniki wyszukiwania - Biblioteka Nauki

1

Analiza porównawcza wybranych parametrów okulograficznych uczniów gimnazjum podczas rozwiązywania zadania

100%

SAJKA M. , ROSIEK R.

Edukacja-Technika-Informatyka

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2015

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tom 6

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nr 3

195-201

PL

Artykuł przedstawia analizę procesu rozwiązywania zadania zarejestrowanego przy użyciu stacjonarnego eyetrackera. Grupę badawczą stanowili uczniowie gimnazjum. Przedmiotem analiz było porównanie zarejestrowanych parametrów okulograficznych, takich jak: czas patrzenia, liczba powrotów i liczba fiksacji uczniów uzdolnionych w dziedzinie nauk ścisłych oraz tych, którzy mają w tym zakresie trudności. Wyodrębniono na przykładzie wybranego zadania przyczyny sukcesu lub porażki jego rozwiązania. Wyniki badań dowodzą, że sposób czytania treści zadania bezpośrednio wpływa na jakość jego rozwiązania.

EN

The paper presents the analysis of the process of solving a problem using eyetracking technology. The research participants were 16-year-old students, graduating from middle school. The subject of the analysis was to compare the eye parameters, such as dwell time, revisits and number of fixations, registered in two groups of students, those who are gifted in science and who have difficulties in this area. The chosen reasons for success in solving the problem were distinguished. Research results show that the way of reading the wording of the problem directly affected the quality of its solution.

2

Różnice w rozwiązywaniu problemów fizycznych przez nowicjuszy i ekspertów

100%

WCISŁO D. , BŁASIAK W. , ANDRZEJEWSKA M. , GODLEWSKA M. , ROSIEK R. , Bożena ROżEK B. , SAJKA M. , STOLIŃSKA A. , PĘCZKOWSKI P.

Edukacja-Technika-Informatyka

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2014

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tom 5

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nr 2

361-367

PL

W artykule prezentujemy wyniki badań dotyczących analizy różnic w rozwiązywaniu problemów fizycznych między nowicjuszami a ekspertami. Grupę nowicjuszy stanowili uczniowie szkoły średniej, studenci informatyki oraz matematyki, a grupę ekspertów pracownicy naukowi uniwersytetu oraz doktoranci fizyki. Za pomocą eye-trackera SMI 1250 sprawdziliśmy, czy czas poświęcony na analizę treści zadania wpływa w sposób istotny na pełne wyodrębnienie niezbędnych informacji potrzebnych do rozwiązania problemu. Analiza uzyskanych wyników w czasie badania pokazała, że eksperci z większą łatwością koncentrują się na istotniejszych informacjach prowadzących do udzielenia poprawnej odpowiedzi na postawione pytanie. Przeprowadzony eksperyment wykazał, że w badanej grupie duży wpływ na wybór błędnej odpowiedzi miało niewłaściwe wykorzystanie wiedzy zdobytej w szkole na lekcjach fizyki.

EN

The article presents results of the research concerning the analysis of differences in solving physics problems among the beginners and experts. The group of beginners consisted of the secondary school students, the students of information technology and mathematics, whereas the group of experts composed of the university research workers as well as post-graduate students of physics. Using the eye-tracker SMI 1250 we checked if time devoted to the analysis of task content influences considerably on full separation of essential information necessary for problem solving. The analysis of the results obtained during the research showed that the experts concentrate more easily on the most important information leading to give the correct answer to the given question. The conducted experiment revealed that in the examined group the wrong usage of knowledge gained at school during physics has big influence on the choice of the wrong answer.

3

Approximating actual flows in physical infrastructure networks: the case of the Yangtze River Delta high-speed railway network

99%

Zhang W. , Derudder B.

Bulletin of Geography. Socio-economic Series

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2016

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tom 31

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nr 31

145-160

EN

Previous empirical research on urban networks has used data on infrastructure networks to guesstimate actual inter-city flows. However, with the exception of recent research on airline networks in the context of the world city literature, relatively limited attention has been paid to the degree to which the outline of these infrastructure networks reflects the actual flows they undergird. This study presents a method to improve our estimation of urban interaction in and through infrastructure networks by focusing on the example of passenger railways, which is arguably a key potential data source in research on urban networks in metropolitan regions. We first review common biases when using infrastructure networks to approximate actual inter-city flows, after which we present an alternative approach that draws on research on operational train scheduling. This research has shown that ‘dwell time’ at train stations reflects the length of the alighting and boarding process, and we use this insight to estimate actual interaction through the application of a bimodal network projection function. We apply our method to the high-speed railway (HSR) network within the Yangtze River Delta (YRD) region, discuss the difference between our modelled network and the original network, and evaluate its validity through a systemic comparison with a benchmark dataset of actual passenger flows.

4

The ISAR Image Post-Processing for Multi-Point Target Identification

85%

Konovalyuk M. , Gorbunova A. , Kuznetsov Y. , Baev A.

International Journal of Electronics and Telecommunications

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2011

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tom Vol. 57, No. 4

433-436

EN

The wideband coherent pulse radar provides high resolution image of the target. A model of this image is composed of the complex envelope superposition of signals diffracted by the point scatterers. The values of complex envelope are distributed over the radar image coordinate plane in accordance with the point scatterer's positions and their reflection coefficients. The radar image model is combining of the range and Doppler profiles. The parameters of the target point scatterers are processed using one dimensional data extracted from the complex discrete Fourier transform of the radar image. The proposed parametric system identification method performs estimation of signal model parameters for the short dwell time and extrapolation of the radar data outside this time. Also the procedure of the ISAR imaging based on the proposed algorithm is introduced. The reducing smeared Doppler shifts and improving image resolution are achieved as a result.

5

Identifying the dwell time change within the operated vehicle view

85%

Poliak M. , Medviď P. , Blaho P.

Archiwum Motoryzacji

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2018

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tom Vol. 82, nr 4

99--116

EN

In public transport, especially in bus services, the number of passengers decreases, largely because individual car transport are able to provide a higher quality passenger transport. Passengers choose the mode of transport based on the shortest travel time. This is why the share of individual car transport is growing, especially in suburban bus transport, but also in urban transport in smaller towns. Given that the travel time is more important for a traveler compared to the cost of transport, the aim of this contribution is to verify the hypothesis that shorter stopping times are needed for vehicles with a smaller capacity. When verifying the hypothesis, the authors will also address the issue of the impact of the number of vehicle doors and total capacity on the total travel time of the passenger.

6

Port congestion determinants and impacts on logistics and supply chain network of five African ports

85%

Nze I. C. , Onyemechi C.

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2018

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tom Vol. 3, No. 1

70--82

EN

This paper typically applied the concept of ranking by inspection using the dwell time of ships in five African ports to evaluate the variations in ship turnaround time and relative efficiency level. This is to identify the active factors that cause port congestion in African ports. The results provided some explanations on the consequences arising from these on notable African logistics and supply chain networks. The findings reveal that the bane of congestion in African ports emanates entirely from either planning, regulation, capacity, efficiency or a combination of these. The regression analysis with IBM SPSS v20 reveals that there is a significant relationship between cargo throughput and other port performance indicators in Nigeria for the study period (2005 - 2014). More so, the t-test reveals that there is a significant relationship between cargo throughput and berth occupancy rate which is significantly indicative of port congestion. This paper therefore recommends that African ports should enhance their regulatory mechanisms, and also improve capacity and efficiency level in order to shoulder the ever increasing challenges of port congestion in years ahead.

7

Wpływ zjawiska pauzy prądu na proces wytwarzania nanokoloidów metali.

71%

Laskowski S.

Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje

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2006

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tom Vol. 44, nr 18

388-392

PL

Podczas eksplozji metalu w cieczy możemy zaobserwować zjawisko pauzy prądu. Polega ono na chwilowym lub całkowitym zaniku prądu rozładowania podczas pierwszego przejścia przez "0". Zjawisko to okazuje się kluczowym dla uzyskania stabilnego koloidu metalu.

EN

Strong electric fields have found increased usage in technological processes. In this article the wire explosion in the liquid in order to obtain metal colloid will be described. Presented method is very effective and inexpensive when it comes to developing colloids of silver. The properties of the colloid depend to a great extent on the degree of solid phase break up. The metal particles created in our experiment belong to hydrophobic colloids. The size of the metal particles in the water is controlled by dosing voltage, current and capacity of the generator. The size of silver particles was observed sedimentation with Turbiscane instrument. It must be mentioned, that the environment of the silver colloid is crucial. Those particles can be used in nano-technology: Raman spectroscopy-SERS effect, Sol-Gel technology. The silver colloid can be used to purify water.

8

Evaluating the impact of long cargo dwell time on port performance: an evaluation model of Douala International Terminal in Cameroon

57%

Aminatou M. , Jaqi Y. , Okyere S.

Archives of Transport

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2018

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tom Vol. 46, iss. 2

7--20

EN

Create as part of the concession agreement signed by the Container Terminal 28 June 2004 with the port of Douala international terminal (DIT) Company aims to manage, operate and develop the Port’s container handling activity in Douala. This paper investigates the main factors explaining long container dwell times in Douala Port. Using original and extensive data on container imports in the Port of Douala, it seeks to provide a basic understanding of why containers stay on average more than two weeks in port space while long dwell times are widely recognized as a critical hindrance to economic development. It also demonstrates the interrelationships that exist between logistics performance of consignees, operational performance of port operators and efficiency of customs clearance operations. Shipment level analysis is used to identify the main determinants of long cargo dwell times and the impact of shipment characteristics such as fiscal regime, density of value, bulking and packaging type, last port of call, and region of origin or commodity group on cargo dwell time in ports is tested. External factors, such as performance of clearing and forwarding agents, shippers and shipping line strategies, also play an important role in the determination of long dwell times.