Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 160
items per page: 25 50 75
Sort by:
Download PDF Download RIS Download Bibtex

Abstract

History has shown different approaches to improving productivity the way of companies do business. Since the early 1900s, the development of different production systems has played an increasingly remarkable role in global manufacturing countries. It seems, that the growth of understanding has widened the ideology of production systems used up to current ones. This article examines the development path of business development. It evaluates the suitability of the key tools used to support change in a modern business model in a customer-driven project business environment.
Go to article

Authors and Affiliations

Jyri Vuorela
1
Mikael Ollikainen
1
Vesa Salminen
2
Juha Varis
1

  1. Energy Systems, LUT University, Finland
  2. Smart Research Center, Häme University of Applied Sciences, Finland
Download PDF Download RIS Download Bibtex

Abstract

The dynamics of the processes taking place in an environment, which is rendered in the

altered perception of the character of this environment, induces a need to find answers to

the following questions: (1) How do managers perceive an environment in the dimensions of

stability/ changeability and friendliness/unfriendliness? (2) Is there a correlation between

the stability/changeability and friendliness/unfriendliness of an environment, i.e. if an environment

is more stable, is it perceived as more friendly, and if an environment is more

changeable is it perceived as unfriendly? (3) Does environmental stability/changeability as

well as friendliness/unfriendliness exert any influence on organizational effectiveness? In

an attempt to answer the above quoted questions, the article’s objective has been defined

as a discussion on the interdependencies perceived by managers between an environment’s

dimensions of stability/changeability and friendliness/unfriendliness (analysed in terms of

institutional categories) and the organizational effectiveness of Polish enterprises.

The managers evaluated the legal environment as the least stable. In their opinion, that

milieu was also more intimidating than friendly. Concurrently, a technological environment

was perceived by the respondents as the most stable and favourable. The results of the

effected research allow forming a conclusion concerning the existing correlation between

the friendliness and stability of particular categories of an environment, at the same time

pointing out to the occurrence of correlations between stability/changeability and friendliness/

unfriendliness of some categories of an environment and the organizational effectiveness

of the examined enterprises.

Go to article

Authors and Affiliations

Paweł Chudziński
Szymon Cyfert
Download PDF Download RIS Download Bibtex

Abstract

Traffic related noise is currently considered as an environmental pollution. Paper presents results of multidirectional study attempting to serve urban traffic without the need to erect noise barriers interfering urban space. Initial concept of the road expansion included construction of 1000 m of noise barriers dividing city space. Improvement in the acoustic conditions after construction completion is possible due to the applied noise protection measures: vehicle speed limit, smooth of traffic flow, use of road pavement of reduced noise emission and the technical improvement of the tramway.

Go to article

Authors and Affiliations

K.J. Kowalski
A.J. Brzeziński
J.B. Król
P. Radziszewski
Ł. Szymański
Download PDF Download RIS Download Bibtex

Abstract

New model of the simulation of the airbag inflation process, taking into account the influence of the airbag environment on the folding process, have been proposed. Equations describing a new model and the used numerical schemes were presented. The differences of the airbag fabric skin motion during the folding process, obtained by the use of different process models (existing and proposed), have been presented on the simple geometry examples. From the analysis of obtained results one acknowledged that the proposed model should be used in all calculations of the airbag operation in non-typical situations, out-of position occupants, side airbags, particularly in the case of small distances between the closed airbag and the elements of the body of the protected person.
Go to article

Authors and Affiliations

Sylwester Tudruj
ORCID: ORCID
Janusz Piechna
ORCID: ORCID
Download PDF Download RIS Download Bibtex

Abstract

The present article provides information on the method of distinguishing between spatial natural units within a valley microregion in the Arctic zone. Geocomplexes fall into 20 types and are grouped under four categories of high order units, i.e. glacial, fluvial, slope and polygenetic geocomplexes. The lithomorphogenetic criterion is useful in differentiating other natural characteristics.

Go to article

Authors and Affiliations

Andrzej Mizgajski
Download PDF Download RIS Download Bibtex

Abstract

Considering the problem of fungal growth in living quarters, and especially after the buildings have been thermally insulated, learning more about mechanisms determining fungal growth in the conditions of day-today usage of such buildings seems to be a necessity. The research on indoor microclimate influence on fungal growth was carried out for too years in two pavilion type living quarters on a residential estate in built Wroclaw - Brochów. A microclimate fostering fungal growth was modelled in the pavilions. Samples of different building materials were exposed to and infected by fungi, and fungal growth was observed and analysed, with regard to the indoor environment. The paper presents the results of the first stage of the research (30 weeks).
Go to article

Authors and Affiliations

Barbara Janińska
Download PDF Download RIS Download Bibtex

Abstract

Within the boundaries of many municipal urbanized areas, large grounds are found, from which the noise is emitted into the environment, surrounded by the regions liable to acoustic protection. Such a condition generates many problems including also those ones related to the lack of the fulfillment of requirements concerning environmental protection against excessive noise. Therefore the aim of vital importance is the proper management of municipal grounds, both in view of the investment in policy steering, especially of new investments, and in the case of activities aimed at maintaining or restoring (revitalizing) the acoustic properties on the grounds that have already been used or simply degraded before.

Keeping the scale of the problem in mind, such activities must be carried on not temporarily, but must have a systemic character. The structure of every system is characterized by the appropriate relationships among their elements and the properties of those relationships. In case of the noise management system, the elements of such a system are the activities connected with the management itself that are the actions which rely on specifying the aims and causing their realization within the scope and on the grounds subject to the managing entity. The superior aim of such activities should be to supply the tools for improvement of management and in the process of taking decisions that relate to investments including the of optimization conditions and maintenance of socio-economic importance of such areas.

Go to article

Authors and Affiliations

Janusz Kompała
Download PDF Download RIS Download Bibtex

Abstract

Soybean ( Glycine max (L.) Merrill.) yielding potential depends on environmental conditions (precipitation, temperature, soil). The aim of the work was to evaluate stability of yielding (and other traits) of three soybean cultivars (Abelina, SG Anser, Merlin) grown under the climatic conditions of central-eastern Poland. The studied material was obtain in a field experiment conducted at Łączka (52°15' N, 21°95' E) during the growing seasons of 2017–2019. Trait stability was determined based on Shukla’s genotype stability variance and Wricke’s ecovalence describing the genotype-by-environment interaction. For all the examined parameters, there were found significant differences between successive growing seasons, cultivars, and cultivars within study years. The greatest influence of environmental conditions (years) was determined for plant height (64%) and first pod height (54.2%). Stability parameters indicated that cv. Abelina was the most stable in terms of yielding, 1000 seed weight, seed number per pod and average seed number per pod, cv. SG Anser being the least stable in this respect
Go to article

Authors and Affiliations

Katarzyna Rymuza
1
ORCID: ORCID
Elżbieta Radzka
1
ORCID: ORCID

  1. University of Siedlce, Faculty of Agricultural Sciences 14 Prusa St., 08-110 Siedlce, Poland
Download PDF Download RIS Download Bibtex

Abstract

The paper addresses the issue of the Electromagnetic Environment Situational Awareness techniques. The main focus is put on sensing and the Radio Environment Map. These two dynamic techniques are described in detail. The Radio Environment Map is considered the essential part of the spectrum management system. It is described how the density and deployment of sensors affect the quality of maps and it is analyzed which methods are the most suitable for map construction. Additionally, the paper characterizes several sensing methods.

Go to article

Authors and Affiliations

M. Suchański
P. Kaniewski
K. Kosmowski
M. Kustra
J. Romanik
Download PDF Download RIS Download Bibtex

Abstract

The author attempted to characterise qualities of complexes of buildings built on various scales in Polish cities, in search of the lost qualities of urbanity and the possibility of reclaiming the housing environment for the city and its residents, a housing environment that is conducive to social integration thanks to the urban climate of the spatial and functional structure of new development complexes in which open public space links urban tissue that is equipped with the necessary programme of social service infrastructure.
Go to article

Authors and Affiliations

Jacek Gyurkovich
Download PDF Download RIS Download Bibtex

Abstract

The most important criteria for evaluation of building engineering is the state of indoor climate and energy consumption. Increase of the rate of energy saving resulted not only in the use of better barriers, but also building elements, such as windows, having low air leakage values. Simultaneously, in the design of new buildings and the retrofit of existing buildings, traditional structures of natural ventilation are used. In these cases, the ventilation is an important tool for a dcsiderable realization of all environmental and energy requirements. The paper presents selected results of a long-term research work. These results were obtained by questionnaires, measurements and simulations of ventilation processes in typical detached houses, blocks of flats and office buildings. The main objective of the presented paper is to demonstrate investigations and summarize a large number of results which describe the airtightness and natural ventilation on indoor environment.
Go to article

Authors and Affiliations

Marian B. Nantka
Download PDF Download RIS Download Bibtex

Abstract

The above-presented methodology for spatial classification of roads in relation to their acoustic annoyance can be used in preparing acoustic maps of towns. The classification of roads with the view of the level of acoustic hazard enables, just in the initial phase of acoustic map preparation, to identify the areas potentially endangered with excessive noise. These areas need taking immediate corrective actions, aimed at reducing the noise level. An important problem, when analyzing the propagation of noise in a highly urbanized area, is the selection of locations in which the measurements of emission of the noise source are performed with the aim to determine its acoustic parameters for calibration of the assumed methodology. Solving this problem makes it possible to use uniform methods of computation. The development of the proposed method and supplementing the layers with next ones, containing information about the range of influence of vibration generated by roadway transport routes, or information on the effects of mining on the roads and building structures, using the proposed methodology, will enable to make an unambiguous categorization of transport routes in the aspect of their vibro-acoustic impact on the environment.
Go to article

Authors and Affiliations

Janusz Kompała
Download PDF Download RIS Download Bibtex

Abstract

Introduction: The Dundee Ready Education Environment Measure (DREEM) is an instru-ment that assesses the educational environment.
Aim: The aim of this study was to psychometrically evaluate a Polish version of the DREEM instrument.
Material and Methods: 203 medical students who fully completed the DREEM questionnaire were included in the study. Validity was evaluated through the analysis of construct validity and reliability.
Results: After language validation the internal consistency was assessed. Cronbach’s alpha for the overall score was 0.93 and the five subscales were: perceptions of learning 0.86, perceptions of teachers 0.82, perceptions of atmosphere 0.75, academic self-perceptions 0.61, and social-self perceptions 0.61. The exploratory factor analyses, however, yielded dimensions that did not fully correspond to the original DREEM subscales.
Conclusions: Internal consistency of the Polish version of the DREEM scale as a whole was excellent, however for each of five originally developed subscales it was lower and vary a lot; construct validity of Polish version was not compatible with the original structure of the DREEM scale but was reasonable. A new five-factor solution obtained in this study could be a reliable tool for assessing the medical education environment in the Polish circumstances, but it will require confirmation in future study.
Go to article

Authors and Affiliations

Dorota Zawiślak
1
Kamila Żur-Wyrozumska
1
Mariusz Habera
1
Karolina Skrzypiec
1
Agnieszka Pac
2
Grzegorz Cebula
1

  1. Department of Medical Education, Faculty of Medicine, Jagiellonian University Medical College, Kraków, Poland
  2. Chair of Epidemiology and Preventive Medicine, Jagiellonian University Medical College, Kraków, Poland
Download PDF Download RIS Download Bibtex

Abstract

It is shown that heat energy transfer from the source to the medium is accompanied by rheological transitions. Physical parameters of the medium change in the rheological transition zone due to heat energy flow transfer at a certain speed. It is shown that use of linear gradient laws during description of heat energy transfer processes leads to great differences between theoretical and experimental results, as well as the paradox of infinite spreading speed of disturbances of temperature fields. For mathematical description of heat energy transfer processes in mediums, it is proposed to use the method of irreversible rheological transitions and zero gradient, thus providing solutions of nonlinear differential equations in analytical form.
Go to article

Authors and Affiliations

Y. Stentsel
O. Porkuian
K. Litvinov
O. Shapovalov
Download PDF Download RIS Download Bibtex

Abstract

In the article we study a model of TCP connection with Active Queue Managementin an intermediate IP router. We use the fluid flow approximation technique to model the interactions between the set of TCP flows and AQM algoithms. Computations for fluid flow approximation model are performed in the CUDA environment.
Go to article

Authors and Affiliations

Adam Domański
Joanna Domańska
Tadeusz Czachórski
Download PDF Download RIS Download Bibtex

Abstract

Geography versus spatial management. The aim of the article is to draw attention to substantive connections that combine spatial management with geography, first of all with socio-economic geography. Both disciplines are of a multidimensional nature and they expose physical space as a field of their interests. The convergence of disciplines is also reflected in the research methodology – a spatial analysis has been developing in socio-economic geography since the 1960s by the so-called spatial direction. Both disciplines are competitive not only on the scientific, but also educational and utilitarian (socio-economic practice) market. The article focuses on the essence and a cognitive sense of both fields, in general, and on their scope of competence. Spatial management should be developed as part of basic sciences, including geography as its professional specialization.
Go to article

Authors and Affiliations

Andrzej Suliborski
Download PDF Download RIS Download Bibtex

Abstract

Trichloroethene (TCE) and tetrachloroethene (PCE) are chemical compounds which pose a serious threat for human health. Their specific properties make it possible that these substances may linger in soil and water for many years. These are the reasons why wells with water designed for drinking purposes have been subject of monitoring since 2006. This paper presents the results of monitoring research conducted in the soil-water environment within the framework in third phase of an ecological audit of land. The ecological audit of land made it possible to identify the cause and degree of the degradation, and helped formulate rationale for remedy decisions pertaining to the land (remediation/reclamation). The objective of the paper was to determine the pollution status of the soil-water environment and, subsequently, monitor (in years 2008-2010) the contents of the hazardous substances, namely trichloroethene and tetrachloroethene, within the area of the potential impact of metallurgical plant located in borders of the Main Underground Water Reservoir Wierzbica-Ostrowiec (GZWP 420) in in voivodeship Świętokrzyskie.

Go to article

Authors and Affiliations

Agnieszka Pusz
Andrzej Kulig
Download PDF Download RIS Download Bibtex

Abstract

The concentrations of Cu, Mn, Ni and Zn in the soil and litterfall, as well as influx of the elements to the soils with litterfall were studied in a mixed beech-pine-spruce stand in northern Poland during the years 2007–2009. Annual influx of litterfall to the soil amounted from 3.234 to 4.871 t/ha. Beech, pine and spruce litterfall contributed in total litterfall in 50.8−70.1%, 11.4−11.9% and 1.6−24.0% respectively. The following average annual concentrations of heavy metals in total litterfall during the 3-year study period were noticed: 2469.3–3469.2 mg Mn/kg, 153.6–160.8 mg/kg Zn, 8.0–14.3 mg Ni/kg and 5.0–6.8 mg Cu/kg. In general, the concentrations of Mn and Cu were higher in beech litterfall in comparison to pine and spruce. The contents of Zn and Ni in beech, pine and spruce litterfall were comparable. Annual influx of metals to the soil with litterfall was: 10341.6–14422.4 g/ha Mn, 460.3–748.1 g/ha Zn, 37.4–66.6 g/ha Ni and 20.2–31.8 g/ha Cu. The fluxes were higher for Mn, Zn and Ni, and comparable for Cu in relation to those observed in other beech, pine, spruce and mixed stands in northern Europe.
Go to article

Authors and Affiliations

Agnieszka Parzych
Jerzy Jonczak
Download PDF Download RIS Download Bibtex

Abstract

Principles of bioluminescence have been described as well as some examples of the biotests that utilize natural bacterial luminescence for assessment of the effects of environment contamination and remediation have been reviewed. The achievements of the last eight years and a new outlook on using rapid biotests for waters, wastewaters, sediments and soils toxicity investigations have been taken into account.
Go to article

Authors and Affiliations

Beata Cwalina
Anna Wiącek-Rosińska
Download PDF Download RIS Download Bibtex

Abstract

Due to the presence of harmful substances in resins those mould sands may be hazardous to the natural environment and workers. The general assessment of harmfulness of sands used for molds and cores encompasses 2 basic points: emission of hazardous substances during processes of preparing sands, pouring mold with liquid metals (high temperatures), cooling and shaking-out; possibility of washing out hazardous substances from used sands to the environment, during storage or economic use outside foundries. We present the results of research on the emission of BTEX compounds from mould sands with phenolic resins during pouring liquid metal of different temperature (cast iron and Al alloy). The research was conducted according to the original method prepared by the authors, which has been used for years in cooperation with various foundries (Poland, abroad).
Go to article

Authors and Affiliations

St.M. Dobosz
J. Jakubski
K. Major-Gabryś
Download PDF Download RIS Download Bibtex

Abstract

Due to the presence of harmful substances in resins those mould sands may be hazardous to the natural environment and workers. The general assessment of harmfulness of sands used for molds and cores encompasses 2 basic points: emission of hazardous substances during processes of preparing sands, pouring mold with liquid metals (high temperatures), cooling and shaking-out; possibility of washing out hazardous substances from used sands to the environment, during storage or economic use outside foundries. We present the results of research on the emission of BTEX compounds from mould sands with phenolic resins during pouring liquid metal of different temperature (cast iron and Al alloy). The research was conducted according to the original method prepared by the authors, which has been used for years in cooperation with various foundries (Poland, abroad).
Go to article

Authors and Affiliations

M. Holtzer
R. Dańko
S. Żymankowska-Kumon
A. Bobrowski
J. Kolczyk
Download PDF Download RIS Download Bibtex

Abstract

The article deals with the gas development of the geopolymer binder system hardened by heat and provides the comparison with organic binder systems. The GEOPOL® W technology is completely inorganic binder system, based on water. This fact allow that the gas generated during pouring is based on water vapour only. No dangerous emissions, fumes or unpleasant odours are developed. The calculated amount of water vapour generated from GEOPOL® W sand mixture is 1.9 cm3/g. The measured volume of gas for GEOPOL® W is 4.3 cm3/g. The measurement of gas evolution proves that the inorganic binder system GEOPOL® W generates very low volume of gas (water vapour) in comparison with PUR cold box amine and Croning. The amount of gas is several times lower than PUR cold box amine (3.7x) and Croning (4.2x). The experiment results are consistent with the literature sources. The difference between the calculated and the measured gas volume is justified by the reverse moisture absorption from the air after dehydration during storing and preparing the sand samples. Minimal generated volumes of gas/water vapour brings, mainly as was stated no dangerous emissions, also the following advantages: minimal risk of bubble defects creation, the good castings without defects, reduced costs for exhaust air treatment, no condensates on dies, reduced costs for cleaning.

Go to article

Authors and Affiliations

M. Vykoukal
A. Burian
M. Přerovská
T. Bajer
J. Beňo
Download PDF Download RIS Download Bibtex

Abstract

The problem of harmful casting resins has been present in foundries for many years. Manufacturers are introducing new products that contain in their composition environmentally and eco-friendly ingredients. Unfortunately, not all types of technology can be used, sometimes environmental benefits are disproportionate to the quality of castings and their price. In the foundry industry, the most popular binders are based on organic compounds (often carcinogenic) and other harmful substances. Due to strict legal regulations regarding environmental protection, as well as care for the foundry's workers' comfort - their occurrence should be reduce to a minimum. These compounds often behave also depending on the conditions of use (temperature, atmosphere). The application of various methods of thermal analysis and spectroscopic methods allows to verify the mechanism of resin decomposition process in relation to conditions in the form in both inert and oxidizing atmosphere. For analysis the resins from cold-box technology, were used TG–DTG–DSC, Py-GC/MS methods and specified the course of changes occurring in combination of different atmosphere.

Go to article

Authors and Affiliations

S. Żymankowska-Kumon
K. Kaczmarska
B. Grabowska
A. Bobrowski
S. Cukrowicz

This page uses 'cookies'. Learn more