Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 6
items per page: 25 50 75
Sort by:
Download PDF Download RIS Download Bibtex

Abstract

The almost unlimited possibilities of modern computational tools create the temptation to study phenomena related to the operation of engineering objects exclusively using complex numerical simulations. However, the fascination with multi-parametric complex computational models, whose solutions are obtained using iterative techniques, may result in qualitative discrepancies between reality and virtual simulations. The need to verify on real objects the conclusions obtained from numerical calculations is therefore indisputable. The enormous cost and uniqueness of large-scale test stands significantly limit the possibility of conducting tests under real conditions. The solution may be an experiment focused on testing features relevant to the given task, while minimising the dimensions of the objects under consideration. Such conditions led to the concept of conducting a series of field experiments to verify the effectiveness of prototype track components, which were developed using numerical simulations to reduce the noise caused by passing trains. The main aim of this study is to examine the acoustic efficiency of prototype porous concrete sound absorbing panels, in relation to the ballasted and ballastless track structures. Presented results of the proposed unconventional experiments carried out on an improvised test stand using the recorded acoustic signals confirm the effectiveness of the developed vibroacoustic isolators.
Go to article

Authors and Affiliations

Cezary Kraśkiewicz
1
ORCID: ORCID
Grzegorz Klekot
2
ORCID: ORCID
Piotr Książka
3
Artur Zbiciak
1
ORCID: ORCID
Przemysław Mossakowski
1
ORCID: ORCID
Patrycja Chacińska
3
Anna Al Sabouni-Zawadzka
1
ORCID: ORCID

  1. Faculty of Civil Engineering, Warsaw University of Technology
  2. Faculty of Automotive and Construction Machinery Engineering, Warsaw University of Technology
  3. National Research Institute, Department of Environmental Acoustics, Institute of Environmental Protection Warsaw, Poland
Download PDF Download RIS Download Bibtex

Abstract

Results of field investigations in 1986 in Calypsostranda, southern coast of Bellsund, are presented. Soils of dry, wet and very wet tundra were studied. Strong skeleton, presence of carbonates, neutral or alkaline reaction, low content of available phosphorus and potassium, high content of organic carbon (in mineral soils) are the most characteristic properties of investigated soils. Regularities in vertical distribution of some components were distinguished.

Go to article

Authors and Affiliations

Zbigniew Klimowicz
Stanisław Uziak
Download PDF Download RIS Download Bibtex

Abstract

Nondestructive and contactless online approaches for detecting defects in polymer films are of significant interest in manufacturing. This paper develops vision-based quality metrics for detecting the defects of width consistency, film edge straightness, and specks in a polymeric film production process. The three metrics are calculated from an online low-cost grayscale camera positioned over the moving film before the final collection roller and can be implemented in real-time to monitor the film manufacturing for process and quality control. The objective metrics are calibrated to correlate with an expert ranking of test samples, and results show that they can be used to detect defects and measure the quality of polymer films with satisfactory accuracy.
Go to article

Authors and Affiliations

Nathir Rawashedeh
1 2
ORCID: ORCID
Paniz Hazaveh
1
Safwan Altarazi
2
ORCID: ORCID

  1. Michigan Technological University, College of Computing, USA
  2. German Jordanian University, School of Applied Technical Sciences, Jordan
Download PDF Download RIS Download Bibtex

Abstract

The industrial revolution taking place since the 18th century has brought the global economies to the stage of mass production, mass industrialization and spreading ideas connected with its efficiency. The most famous of its kind is Fordism and its modern variations called PostFordism or Neo-Fordism. We can still see traditional way of producing things in some parts of the world, and the leading economies are using Ford’s ideas or the modifications of the Ford’s concepts. But there is a question about the place of these models in the modern economy, especially because mass-production causes mass-waste and modern societies has woken up to the reality of the global pollution, climate change or just the simple fact that the amount of the raw materials is limited. The social mood is slowly changing so there should be a change to the way we produce and consume things as well. There is a question: can we proceed within existing models or should we think outside the box so we can invent more suitable way of looking at efficiency and effectiveness. The objective of this paper is to contribute to the discussion about the future of how are we going to produce things. It is based on the literature review considering Fordism and its variations, Product Life Cycle facing issues like pollution, massive waste and changes in modern economy, as well as on the case study of implementing waste reduction activities in the product’ design phase in the industrial plant based in one of the EU countries – Poland.
Go to article

Authors and Affiliations

Mariusz Bednarek
1 2
Aneta Parkes
3

  1. Wyższa Szkoła Bankowa, Warszawa, Poland
  2. Universidad Autonoma de Chile, Temuco, Chile
  3. Społeczna Akademia Nauk, Łódź, Poland
Download PDF Download RIS Download Bibtex

Abstract

The attractiveness of uncultivated (weedy) and cultivated strips (planted with a mixture of flowering plants) and the adjacent sugar beet crop to Carabidae was studied in 1999–2000 at the Experimental Research Station near Wrocław, Poland. Obtained results showed that greater plant abundance and their diversity on weedy strips had a positive effect on the number of carabid beetles. Also more carabid species were identified in uncultivated strips than in strips of mixture of Phacelia tanacetifolia, Coriandrum sativum and Sinapis alba. The lowest number of species was trapped in sugarbeet crop and bare soil. The most numerous species in all treatments were Pseudoophonus rufipes, Anchomenus dorsalis (Pont.), Poecilus cupres and the species of the Bembidion genera.

Go to article

Authors and Affiliations

Jacek P. Twardowski
Michał Hurej
Teresa Jaworska

This page uses 'cookies'. Learn more