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Tytuł:
Circular economy in companies: an analysis of selected indicators from a managerial perspective
Autorzy:
Janik, Agnieszka
Ryszko, Adam
Powiązania:
https://bibliotekanauki.pl/articles/2064777.pdf
Data publikacji:
2019
Wydawca:
STE GROUP
Tematy:
circular economy
circular economy indicators
micro level
company
Opis:
The circular economy (CE) concept is now gaining increasing attention and it is being widely explored as a promising path to sustainable development. CE implementation requires extensive activities needed for the transition from the linear to the circular model and suitable tools to support decision-makers in setting adequate goals and monitoring the effects of undertaken actions. Considering the need for research on effective CE performance evaluation, this article presents a comprehensive analysis and comparison of CE indicators available at the micro level. Based on a systematic literature review, 19 such CE indicators were identified. The indicators were assessed and compared using the Delphi methodology. The suitability of each metric for a comprehensive evaluation of CE performance was analyzed taking account of the criteria related to analytical opportunities and potential application of CE indicators, together with the criteria related to organizational and operational issues of practical application of CE indicators. The usefulness of CE indicators for practical implementation in companies was determined from a managerial perspective, with particular emphasis on supporting the decision-making process. The comparison of CE indicators presented in this article is intended to facilitate the choice of a specific metric depending on the company’s needs and on the possibilities of its application.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2019, 2, 1; 523--535
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determining of Maximum Stress in Circular and Circular Hollow Rod by Measurement of Strains
Autorzy:
LABAŠ, Vladimír
ĎURIŠ, Rastislav
LABAŠOVÁ, Eva
Powiązania:
https://bibliotekanauki.pl/articles/456446.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Rzeszowski
Tematy:
shear stress
circular rod
hollow circular rod
measurement system
Opis:
The contribution deals with determining of stress from measured values of strains. Gauge strains, which were linked in half-bridge, and the universal measurement system QuantumX MX840 were used to experimentally obtain the strains. Rods with circular section and hollow circular section serve as tests samples. Students within the educational process will have the opportunity to acquaint with the universal measuring system and see the interconnectedness of theory and practical application.
Źródło:
Edukacja-Technika-Informatyka; 2015, 6, 2; 173-178
2080-9069
Pojawia się w:
Edukacja-Technika-Informatyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Circular behaviours undertaken by Polish households - a preliminary analysis of research results
Autorzy:
Szczygieł, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/2211946.pdf
Data publikacji:
2021-12-30
Wydawca:
Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
Tematy:
circular economy
circular motives
statistical analysis
quality of life
Opis:
The main aim of the paper is to analyse and evaluate the possible relation between circular behaviours undertaken by the households and the socio-economic features describing them. The paper presents the results of the author’s research conducted among Polish households on the territory of two voivodeships: Podkarpackie and Małopolskie. In the article, the author presents the concept of circular behaviours (understood as an element of pro-ecological behaviours), as well as the result of the preliminary analysis of the frequency of exhibiting those behaviours in the households. This analysis is based on evidence regarding the possible differences between the households due to their distinct features. To indicate the possible differences the Chi2 Test of Independence was used. Obtained results indicate that some socio-economic features may have an influence on the frequency of conducting circular behaviours. It could be important due to the establishment of supporting activities aiming at increasing the overall level of circularity among households (as an economic sector). This article is the fourth one in the publication series devoted to circular economy and sustainable development matters.
Źródło:
Prace Komisji Geografii Przemysłu Polskiego Towarzystwa Geograficznego; 2021, 35, 4; 188-204
2080-1653
Pojawia się w:
Prace Komisji Geografii Przemysłu Polskiego Towarzystwa Geograficznego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Citizen involvement in waste management and circular economy in cities: Key elements for planning and implementation
Autorzy:
Izdebska, Olga
Knieling, Jörg
Powiązania:
https://bibliotekanauki.pl/articles/1019501.pdf
Data publikacji:
2020-12-30
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
circular economy
circular city
waste management
citizen involvement
collaborative governance
Opis:
This paper identifies and explores key elements for planning and implementing citizen involvement in the area of waste management and circular economy in cities. The analysis has shown that institutions responsible for waste management regard strategic planning, inclusivity, transparency, continuity, and resources as particularly important for reaching the objectives of citizen involvement. However, not all of the four analysed cities have applied these elements to the same extent, due to e.g. a lack of a strategy for citizen involvement, or limited personal and financial resources.
Źródło:
European Spatial Research and Policy; 2020, 27, 2; 115-129
1231-1952
1896-1525
Pojawia się w:
European Spatial Research and Policy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generalized circular colouring of graphs
Autorzy:
Mihók, Peter
Oravcová, Janka
Soták, Roman
Powiązania:
https://bibliotekanauki.pl/articles/743910.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
graph property
P-colouring
circular colouring
strong circular P-chromatic number
Opis:
Let P be a graph property and r,s ∈ N, r ≥ s. A strong circular (P,r,s)-colouring of a graph G is an assignment f:V(G) → {0,1,...,r-1}, such that the edges uv ∈ E(G) satisfying |f(u)-f(v)| < s or |f(u)-f(v)| > r - s, induce a subgraph of G with the propery P. In this paper we present some basic results on strong circular (P,r,s)-colourings. We introduce the strong circular P-chromatic number of a graph and we determine the strong circular P-chromatic number of complete graphs for additive and hereditary graph properties.
Źródło:
Discussiones Mathematicae Graph Theory; 2011, 31, 2; 345-356
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculations of Electric Fields of Circular Screened Systems, Generated from Cylindrical Piezoceramic Radiators
Autorzy:
Leiko, Aleksandr
Derepa, Anatolii
Rasstrygin, Aleksandr
Kosiakovskyi, Andrii
Kocharian, Oksana
Starovoit, Yaroslav
Powiązania:
https://bibliotekanauki.pl/articles/176548.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
electric fields
circular system with baffle
piezoceramic cylindrical radiator
circular polarization
Opis:
Analytical relations, describing the electrical fields of cylindrical piezoceramic radiators with circular polarization as a member of the cylindrical systems with the baffle in the inner cavity, using the related fields method in multiply connected regions were obtained. Comparative analysis of the results of numerical experiments performed on the frequency characteristics of the electric field of the radiating systems for different modes of radiation allow to establish a number of subtle effects of the formation of the electric field of radiators.
Źródło:
Archives of Acoustics; 2019, 44, 1; 129-135
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Certain Practical Issues Relating to Construction of the In-duct Single Mode Synthesizer
Autorzy:
Gorazd, Ł.
Snakowska, A.
Jurkiewicz, J.
Flach, A.
Powiązania:
https://bibliotekanauki.pl/articles/176490.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
circular hard-walled duct
modal structure
cut-on mode
circular duct modeling
Opis:
It is convenient to have a device and a method of generating single cut-on modes in cylindrical hard-walled waveguides or at least in laboratory models of such systems. This allows to examine, among other things, properties of various active and/or passive elements inserted in a cylindrical duct by testing them in conditions when the incident (input) wave comprises only one cut-on mode and determining the reflection and transmission coefficients for single selected incident modes. As it has been already demonstrated by the present authors, it is possible to generate single cut-on modes in a circular duct using a small (although increasing with mode order) number of acoustic monopoles arranged properly on a duct cross-section and driven with appropriate acoustic volume amplitudes and phases. Laboratory models of such sources are proposed in this paper and results of tests verifying their directional properties are presented. The other technical issue relating to practical utilization of the proposed method is the possible error introduced by the apparatus used for scanning the acoustic field inside the duct model. It is shown that insertion of the measuring probe changes the total energy radiated into the free space only by a fraction of a decibel.
Źródło:
Archives of Acoustics; 2015, 40, 2; 247-255
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Project Management for Circular Economy projects in 7 steps
Zarządzanie w 7 krokach projektami dla gospodarki o obiegu zamkniętym
Autorzy:
Kurzydłowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/278967.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Inżynierii Materiałów Polimerowych i Barwników
Tematy:
Circular Economy projects
Project Management
projekty z zakresu Circular Economy
zarządzanie projektami
Opis:
Circular Economy is a new term for already known trend to reduce the environmental impact of the industrial activities. Shifting to a circular economy is not a straight forward process of incremental changes in the production system and that it usually calls for development of new, high risk technologies, implementation of which might be easier if performed under the guide lines of the project management. This is because the new undertakings within the concept of circular economy have all the characteristics of more general class of projects typically managed under the systems assuring the required risk mitigation. These characteristics are: lack of precedence (originality), ambitious tasks, complexity and the risk. When all these “ingredients” are there, there is clear benefit, and perhaps even an urgent need for professional project management approach. Management of the projects involves, among others, scheduling, budgeting and risk mitigation. For the beginners, the advanced procedures of project management might be difficult to comprehend. Thus, in this paper, the focus is on the seven basic steps, which need to be made in this respect to assure timely and strict financial implementation of the projects. The aim of the paper is to familiarize the readers with the basic tools/rules of the project management, which are crucial in the project management practice. Also, based on the Author’s personal experience, these tools/rules are explained in the way, which simplifies their application.
Circular Economy to nowy termin dla znanej już tendencji do ograniczania wpływu na środowisko działalności przemysłowej. Przejście do gospodarki o obiegu zamkniętym nie jest prostym procesem, wymaga stopniowych zmian w systemie produkcyjnym i zwykle wymaga opracowania nowych technologii, których wdrożenie może być łatwiejsze, jeśli zostanie przeprowadzone w ramach wytycznych dotyczących zarządzania projektem. Dzieje się tak, dlatego, że nowe przedsięwzięcia w ramach koncepcji gospodarki o obiegu zamkniętym mają wszystkie cechy bardziej ogólnej klasy projektów zazwyczaj zarządzanych w ramach systemów zapewniających wymagane ograniczenie ryzyka. Te cechy to: brak precedensu (oryginalność.), ambitne zadania, złożoność i ryzyko. Kiedy wszystkie te „składniki” istnieją, występuje wyraźna korzyść, a być może nawet nagła potrzeba profesjonalnego podejścia do zarządzania projektami. Zarządzanie projektami obejmuje między innymi planowanie, budżetowanie i ograniczanie ryzyka. Dla początkujących, zaawansowane procedury zarządzania projektami mogą być trudne do zrozumienia. Dlatego w niniejszej pracy skupiono się na siedmiu podstawowych krokach, które należy podjąć w tym zakresie, aby zapewnić terminową i ścisłą realizację finansową projektów. Celem artykułu jest zapoznanie czytelników z podstawowymi narzędziami i zasadami zarządzania projektem, które są kluczowe w praktyce zarządzania projektami. Ponadto, w oparciu o osobiste doświadczenia Autora, te narzędzia zasady są objaśniane ze taki sposób, co upraszcza ich stosowanie.
Źródło:
Przetwórstwo Tworzyw; 2017, T. 23, Nr 6 (180), 6 (180); 543-549
1429-0472
Pojawia się w:
Przetwórstwo Tworzyw
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic evolution of mixed circular edge-screw dislocations
Autorzy:
Gao, P.
Li, J.
Cheng, K.
Duan, M.
Powiązania:
https://bibliotekanauki.pl/articles/173359.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
mixed circular edge-screw dislocations
optical vortex
circular edge dislocations
atmospheric turbulence
Opis:
Based on the extended Huygens–Fresnel principle, the analytical expressions for the cross-spectral density function of mixed circular edge-screw dislocations beams propagating through atmospheric turbulence have been derived, and used to study the dynamic evolution of mixed circular edge-screw dislocations in free space and atmospheric turbulence. It is shown that the radius of circular edge dislocations increases with increasing propagation distance, and both the positions of the optical vortex and the center of circular edge dislocations are located at the point (0, 0) when mixed circular edge-screw dislocations propagate in free space. When mixed circular edge-screw dislocations propagate in the atmospheric turbulence, the position of optical vortices varies with increasing propagation distance, the circular edge dislocation evolves into a pair of optical vortices with the opposite topological charge ±1, and the pair of optical vortices will annihilate as soon as the propagation distance becomes large enough.
Źródło:
Optica Applicata; 2017, 47, 3; 471-481
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Circular economy performance of EMAS organizations in Poland based on an analysis of environmental statements
Autorzy:
Janik, Agnieszka
Szafraniec, Marek
Powiązania:
https://bibliotekanauki.pl/articles/2064766.pdf
Data publikacji:
2019
Wydawca:
STE GROUP
Tematy:
EMAS
environmental statement
circular economy
Opis:
The transition from the linear model to the circular economy (CE) model is not an easy task and it requires constant monitoring of the achieved effects. Taking this fact into consideration, in January 2018 the European Union (EU) set 10 indicators to monitor and evaluate the main elements of the circular economy in the EU and its Member States. The list of indicators is short and it is based on the use of current available data. The monitoring results are intended to constitute the basis for setting new priorities towards the long-term goal of the circular economy. In case of companies there is still no framework for monitoring the effects of circular economy at micro level. In practice, various indicators for circularity assessment at micro level are available, but each of the indicators evaluates the complexity of circular economy to different extent. For this reason, there is a need to create a framework for monitoring the circular economy at company level, which would also be based on information already collected by the companies for the preparation of various environmental reports. Therefore, this article presents the results of review 66 environmental statements, which are prepared and updated annually by organizations participating in the Eco-Management and Audit Scheme (EMAS) system in Poland. On this basis, it was determined what circular economy information are already collected and reported by the companies and which information can be included in the framework of circular economy monitoring at company level in the future.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2019, 2, 1; 536--547
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Wood Processing Safety in the Production Organization
Autorzy:
Kotus, M.
Koloman, K.
Hudec, M.
Powiązania:
https://bibliotekanauki.pl/articles/2065027.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
hazard
threat
risk
circular saw
Opis:
Occupational health and safety legislation imposes an obligation on the production organization to regularly and comprehensibly inform employees of the dangers, threats and risks involved. In the paper, we assessed the basic requirements of safety in the wood processing workshop on the forming disc saw. Deficiencies in non-compliance with security regulations were determined from the check list analysis (CLA). The safety assessment was performed using the extended point method, where we determined the value of the risk measure. When working on a saw blade, the risk cannot be accepted and safety precautions have to be proposed. For the production organization, we have proposed remedial measures and a safety card to be considered before working on forming disc saw. All the measures proposed by us were accepted and implemented by the production organization. Applying and observing safety measures can prevent the occurrence of an occupational injury or damage to the health of the worker.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2018, 1, 1; 727--737
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Circular operators related to some quantum observables
Autorzy:
Szymański, Wacław
Powiązania:
https://bibliotekanauki.pl/articles/1294815.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
circular operator
canonical commutation relation
Opis:
Circular operators related to the operator of multiplication by a homomorphism of a locally compact abelian group and its restrictions are completely characterized. As particular cases descriptions of circular operators related to various quantum observables are given.
Źródło:
Annales Polonici Mathematici; 1997, 66, 1; 253-261
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
T-Colorings, Divisibility and the Circular Chromatic Number
Autorzy:
Janczewski, Robert
Trzaskowska, Anna Maria
Turowski, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/32083881.pdf
Data publikacji:
2021-05-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
circular chromatic number
T-coloring
Opis:
Let $T$ be a $T$-set, i.e., a finite set of nonnegative integers satisfying $0 ∈ T$, and $G$ be a graph. In the paper we study relations between the $T$-edge spans $esp_T(G)$ and $esp_{d⊙T}(G)$, where $d$ is a positive integer and \[d⊙T=\{ 0≤t≤d(maxT+1):d|t⇒t/d∈T\}.\] We show that $esp_{d⊙T}(G) = d esp_T(G) − r$, where $r, 0 ≤ r ≤ d − 1$, is an integer that depends on $T$ and $G$. Next we focus on the case $T = {0}$ and show that \[esp_{d⊙\{0\}}(G)=⌈d(χ_c(G)-1)⌉,\] where $χ_c(G)$ is the circular chromatic number of $G$. This result allows us to formulate several interesting conclusions that include a new formula for the circular chromatic number \[χ_c(G)=1+inf\{esp_{d⊙\{0\}}(G)/d:d≥1\}\] and a proof that the formula for the $T$-edge span of powers of cycles, stated as conjecture in [Y. Zhao, W. He and R. Cao, The edge span of T-coloring on graph $C_n^d$, Appl. Math. Lett. 19 (2006) 647–651], is true.
Źródło:
Discussiones Mathematicae Graph Theory; 2021, 41, 2; 441-450
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of the Russian-Ukrainian war on the green transition and the energy crisis: Ukrainian scenario of circular economy development
Autorzy:
Reznikova, Nataliia
Zvarych, Iryna
Zvarych, Roman
Ivashchenko, Oksana
Powiązania:
https://bibliotekanauki.pl/articles/10096819.pdf
Data publikacji:
2023-02-24
Wydawca:
Główny Urząd Statystyczny
Tematy:
circular ecomomy
green transition
energy crisis
russian -ukrainian war
humanitarian crisis
global inclusive circular ecomomy
Opis:
The aim of the article is to minimise the impact of the energy crisis on the environment as one of the ways of getting rid of carbon footprints resulting from the growth of the russian energy and building a circular sustainable ecosystem in Ukraine. Therefore, the study proposes a classification of green inflation and singles out the following forms of its manifestation: 1) as a reaction to irresponsible management; 2) as a reaction to an attempt to implement large-scale projects aimed at decarbonisation within strict time limits; 3) as a reaction to the strengthening of business standards, which the end consumer will have to pay for. The paper determines the impact that the war has on the practice of applying resource nationalism associated with a wide variety of modern global problems. Discussions focus particularly on the following topics: the ‘resource curse’, the growing concern of the OECD countries. The paper identifies the dominant diversification tendencies in the EU in terms of the circularity of the economy. The proposed concept of a global inclusive circular economy can be considered as a complex multidimensional system, whose main components are based on the economic, sociological, environmental and circular aspects of life.
Źródło:
Statistics in Transition new series; 2023, 24, 1; 45-62
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Circular economy practices as a tool for sustainable development in the context of renewable energy: What are the opportunities for the EU?
Autorzy:
Jakubelskas, Ugnius
Skvarciany, Viktorija
Powiązania:
https://bibliotekanauki.pl/articles/19903811.pdf
Data publikacji:
2023
Wydawca:
Instytut Badań Gospodarczych
Tematy:
circular economy
sustainable development
renewable energy
Opis:
Research background: In order to tackle climate change and ensure Paris agreements are met, countries are forced to look for alternative ways of producing, consuming, and wasting and adopt a circular economy. Reduction of greenhouse gas emissions becomes one of the key elements. The demand for electricity is increasing, and most greenhouse gas emissions derive from the energy sector. Because of that, it is crucial to ensure the transition from fossil fuels to renewable energy. Renewable energy, as a part of the circular economy, also contributes to sustainable development. Only the efficient implementation of circular economy and renewable energy practices can ensure that sustainable development goals are achieved. Purpose of the article: The study aims at determining the efficiency of European Union countries implementing circular economy practices through renewable energy to attain SDGs. The study focuses on the significance of renewable energy as a tool for the circular economy to achieve sustainable development and highlights the progress achieved in SDG through renewable energy in the EU. Methods: For efficiency assessment of the circular economy represented by the renewable energy indicators, data envelopment analysis (DEA) was performed. Findings & value added: This study presents a relation analysis of the circular economy and renewable energy and the importance of efficiency in achieving SDGs through a circular economy. The study helps to understand the circular economy represented by renewable energy and how it transforms into sustainable development and contributes to necessary actions needed for countries to improve. Based on the results, Sweden, Luxembourg, Ireland, Latvia, Estonia, Malta, the Netherlands and Bulgaria are considered the most efficient countries, while Austria is the least efficient. Unused solar and wind power potential can slow down sustainable development; however, EU programs and renewable energy strategies help countries move towards clean energy and ensure efficient implementation of sustainable development goals.
Źródło:
Oeconomia Copernicana; 2023, 14, 3; 833-859
2083-1277
Pojawia się w:
Oeconomia Copernicana
Dostawca treści:
Biblioteka Nauki
Artykuł
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