Design and performance of the pulsed positron beam at Chalmers University of Technology

2009 ◽  
Vol 267 (17) ◽  
pp. 2934-2937 ◽  
Author(s):  
L. Mileshina ◽  
A. Nordlund
Keyword(s):  
Positron Beam ◽  
University Of Technology ◽  
And Performance

scholarly journals Comparison of a Novel Polymeric Hollow Fiber Heat Exchanger and a Commercially Available Metal Automotive Radiator

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1175
Author(s):  
Tereza Kroulíková ◽  
Tereza Kůdelová ◽  
Erik Bartuli ◽  
Jan Vančura ◽  
Ilya Astrouski
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Hollow Fiber ◽  
Pressure Loss ◽  
Air Flow ◽  
Performance Parameters ◽  
University Of Technology ◽  
Flat Tubes ◽  
And Performance ◽  
Louvered Fins

A novel heat exchanger for automotive applications developed by the Heat Transfer and Fluid Flow Laboratory at the Brno University of Technology, Czech Republic, is compared with a conventional commercially available metal radiator. The heat transfer surface of this heat exchanger is composed of polymeric hollow fibers made from polyamide 612 by DuPont (Zytel LC6159). The cross-section of the polymeric radiator is identical to the aluminum radiator (louvered fins on flat tubes) in a Skoda Octavia and measures 720 × 480 mm. The goal of the study is to compare the functionality and performance parameters of both radiators based on the results of tests in a calibrated air wind tunnel. During testing, both heat exchangers were tested in conventional conditions used for car radiators with different air flow and coolant (50% ethylene glycol) rates. The polymeric hollow fiber heat exchanger demonstrated about 20% higher thermal performance for the same air flow. The efficiency of the polymeric radiator was in the range 80–93% and the efficiency of the aluminum radiator was in the range 64–84%. The polymeric radiator is 30% lighter than its conventional metal competitor. Both tested radiators had very similar pressure loss on the liquid side, but the polymeric radiator featured higher air pressure loss.

scholarly journals Analysis of the Application of Distributed Propulsion to the AOS H2 Motor Glider

2019 ◽  
Vol 26 (2) ◽  
pp. 85-92
Author(s):  
Michał Kuźniar ◽  
Marek Orkisz
Keyword(s):  
Combustion Engine ◽  
Electric Motors ◽  
Flight Duration ◽  
Electric System ◽  
University Of Technology ◽  
Distributed Propulsion ◽  
Small Set ◽  
And Performance ◽  
Fitting In ◽  
Selection Of

Abstract The paper describes the selection of a distributed propulsion for the AOS H2 motor glider (selection of engines, their number, and propellers) and determination of its performance. This analysis is related to the research conducted on environment friendly and hybrid propulsions in various research centres. The main aim of the analyses conducted is to increase the performance of vehicles powered by electric motors. The batteries have a low density of energy, i.e. the ratio of mass to cumulated energy. Instead of a battery set, it is possible to apply a hybrid-electric system, where the combustion engine works as a generator or an electric-hydrogen generator, where the hydrogen cell supports a small set of batteries. One of such flying vehicles, fitting in this trend, is the AOS H2 motor glider built at the Rzeszow University of Technology in cooperation with other universities. It is a hybrid aircraft, equipped with a hydrogen cell, which together with a set of batteries is a source of electricity for the Emrax 268 electric motor. To increase the vehicle's performance (the range and flight duration), it is possible to use a distributed propulsion. This type of propulsion consists in placing many electric motors along the wingspan of the aircraft. Appropriate design of such a system (propeller diameters, engine power, number of engines) can improve the aerodynamic and performance parameters of the airframe. An analysis of the performance for the selected flight trajectory for this propulsion variant was conducted and compared to the performance of the AOS H2 motor glider equipped with traditional propulsion. The consumption of hydrogen was also determined for both systems. The results obtained were presented in the diagrams and discussed in the conclusions.

Design and Practice of FSAE Car Dynamic Data Acquisition System

2013 ◽  
Vol 774-776 ◽  
pp. 399-406
Author(s):  
Shan Hu Yu ◽  
You Lin Yao ◽  
Yu Jian Wang ◽  
Yun Hao Zhang ◽  
Jie Li ◽  
...  
Keyword(s):  
Data Acquisition ◽  
Data Acquisition System ◽  
Acquisition System ◽  
Labview Software ◽  
University Of Technology ◽  
Improve Accuracy ◽  
And Performance ◽  
Design And Practice ◽  
Adjustment Scheme ◽  
Dynamic Data Acquisition

According to the requirement of Formula Student China (FSC), combined with the actual of 2012 Guangzhou Auto S - Power team of South China University of Technology, a set of data acquisition system was designed and developed, and performance of the car chassis was analysed with data acquisition system, effective adjustment scheme is put forward. program was designed with LabVIEW software and NI cRIO 9076 data collector. This is experiment demonstrated that data acquisition system help designer to understand the quantitative value of the car performance in the process of the car testing, and help us to improve accuracy of the chassis adjustment, and also help us to improve work efficiency of commissioning phase.

Design and performance of a novel neutron powder diffractometer: PEARL at TU Delft

2016 ◽  
Vol 49 (5) ◽  
pp. 1398-1401 ◽  
Author(s):  
L. van Eijck ◽  
L. D. Cussen ◽  
G. J. Sykora ◽  
E. M. Schooneveld ◽  
N. J. Rhodes ◽  
...  
Keyword(s):  
Powder Diffraction ◽  
High Performance ◽  
Research Reactor ◽  
Neutron Powder Diffraction ◽  
Powder Diffractometer ◽  
University Of Technology ◽  
Neutron Powder Diffractometer ◽  
And Performance

The performance of the new neutron powder diffraction instrument PEARL that is installed at the research reactor of Delft University of Technology is reported. It is based on the optimization concepts developed by Cussen [Nucl. Instrum. Methods Phys. Res. Sect. A (2007), 583, 394–406], which lead to high performance competing with existing constant-wavelength neutron powder diffractometers, despite the relatively low source brightness of the 2 MW reactor of Delft University of Technology.

scholarly journals Southwestern Nigerian University Undergraduates’ Acceptance of YouTube as a web-based Instructional Tool

2019 ◽  
Vol 6 (8) ◽  
pp. 45-57
Author(s):  
Temitope Oteyola ◽  
Tayo Bada ◽  
Itunu Akande
Keyword(s):  
Instructional Tool ◽  
Southwestern Nigeria ◽  
Web Based ◽  
Performance Expectancy ◽  
Ogun State ◽  
Use Of Technology ◽  
University Of Technology ◽  
Hard Disk Space ◽  
And Performance ◽  
Descriptive Survey

The study assessed the Southwestern Nigerian undergraduates’ acceptance of YouTube as a web-based instructional tool using Unified Theory of Acceptance and Use of Technology (UTAUT) Model. It determined the level of awareness of YouTube as a web-based instructional tool by the undergraduates. It measured the undergraduates’ effort and performance expectancy of YouTube and the conditions that facilitate its acceptance at the universities. The study employed the descriptive survey research design. The population consisted all registered undergraduates in Southwestern Nigeria. 800 students were selected from Obafemi Awolowo University (OAU), Ile-Ife, Osun State, Ladoke Akintola University of Technology (LAUTECH), Oyo State and Covenant University, Ota, Ogun State using disproportionate stratified sampling. The three universities were purposively selected based on their webometric ranking in terms of ICT usage. Findings from the study indicated that 57.80% of the undergraduates are moderately aware of YouTube as an instructional tool. The effort expectancy (×̅=3.00, sd=0.60) as well as the performance expectancy (×̅=3.00, sd=0.62) show that the undergraduates accept YouTube. The conditions identified by the undergraduates that can militate the acceptance of YouTube in the region included low bandwidth (79.70%), low hard disk space (65.60%), epileptic electricity supply (68.60%) and high cost of required devices (68.40%). The study therefore concluded that Southwestern Nigerian undergraduates are prone to accepting YouTube as a web-based instructional tool.  The study assessed the Southwestern Nigerian undergraduates’ acceptance of YouTube as a web-based instructional tool using Unified Theory of Acceptance and Use of Technology (UTAUT) Model. It determined the level of awareness of YouTube as a web-based instructional tool by the undergraduates. It measured the undergraduates’ effort and performance expectancy of YouTube and the conditions that facilitate its acceptance at the universities. The study employed the descriptive survey research design. The population consisted all registered undergraduates in Southwestern Nigeria. 800 students were selected from Obafemi Awolowo University (OAU), Ile-Ife, Osun State, Ladoke Akintola University of Technology (LAUTECH), Oyo State and Covenant University, Ota, Ogun State using disproportionate stratified sampling. The three universities were purposively selected based on their webometric ranking in terms of ICT usage. Findings from the study indicated that 57.80% of the undergraduates are moderately aware of YouTube as an instructional tool. The effort expectancy (×̅=3.00, sd=0.60) as well as the performance expectancy (×̅=3.00, sd=0.62) show that the undergraduates accept YouTube. The conditions identified by the undergraduates that can militate the acceptance of YouTube in the region included low bandwidth (79.70%), low hard disk space (65.60%), epileptic electricity supply (68.60%) and high cost of required devices (68.40%). The study therefore concluded that Southwestern Nigerian undergraduates are prone to accepting YouTube as a web-based instructional tool. 

Perceived influence of mechanical engineering students’ work placement experiences on their occupational competency and self-efficacy

2020 ◽  
pp. 030641902095311
Author(s):  
Tiyamike Ngonda ◽  
Corrinne Shaw ◽  
Bruce Kloot
Keyword(s):  
South African ◽  
Self Efficacy ◽  
Mechanical Engineering ◽  
Engineering Students ◽  
Systems Dynamics ◽  
Social Mechanisms ◽  
Dynamics Model ◽  
Work Placement ◽  
University Of Technology ◽  
And Performance

This paper proposes a qualitative systems dynamics model that explains how students’ work placement experiences either enhance or hinder the growth of their occupational competency and self-efficacy. The model is developed from qualitative analysis of work placement experiences of mechanical engineering students from a South African university of technology. Findings from the analysis show that students’ occupational competency and self-efficacy could be considered emergent outcomes of interactions of the learning environment, mentor posture, mentor capacity, mentor availability, meaningfulness of work, scope of work, agency, doing work, co-participating, participation trajectory and performance trajectory. The explanation of the factors and social mechanisms that influence students’ occupational competency and self-efficacy that is offered by the qualitative systems dynamics model would enable the implementation of work placement programs in a manner that would promote rather than hinder the growth of these two indicators of student employability.

Test and Integration of Location Sensors for a Multi-sensor Personal Navigator

2006 ◽  
Vol 60 (1) ◽  
pp. 107-117 ◽  
Author(s):  
Günther Retscher
Keyword(s):  
High Reliability ◽  
Dead Reckoning ◽  
Barometric Pressure ◽  
Navigation Systems ◽  
Filter Model ◽  
University Of Technology ◽  
Current Location ◽  
Outdoor Environments ◽  
And Performance ◽  
Office Rooms

In the work package “Integrated Positioning” of the research project NAVIO (Pedestrian Navigation Systems in Combined Indoor/Outdoor Environments) we are dealing with the navigation and guidance of visitors to our University. The start points are the public transport stops in the surroundings of the Vienna University of Technology and the system users should be guided to certain office rooms or persons. For the user's position determination different location sensors are employed, i.e., for outdoor positioning GPS and dead reckoning sensors, such as a digital compass and gyro for heading determination, accelerometers for the determination of the distance travelled, a barometric pressure sensor for altitude determination and, for indoor areas, location determination using WiFi fingerprinting. All sensors and positioning methods are combined and integrated using a Kalman filter. An optimal estimate of the current location of the user is obtained using the filter. To perform an adequate weighting of the senors in the stochastic filter model, the sensor characteristics and performance were investigated in several tests. The tests were performed in different environments either with free satellite visibility, in urban canyons or inside buildings. The tests have shown that it is possible to determine the user's location continuously with the required precision and that the selected sensors provide a good performance and high reliability. Selected tests results and our approach are presented in the paper.

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