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Tytuł:
Workplace innovation: exploratory and confirmatory factor analysis for construct validation
Autorzy:
Wipulanusat, W.
Panuwatwanich, K.
Stewart, R. A.
Powiązania:
https://bibliotekanauki.pl/articles/407161.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
workplace innovation
exploratory factor analysis
confirmatory factor analysis
Opis:
Workplace innovation enables the development and improvement of products, processes and services leading simultaneously to improvement in organisational performance. This study has the purpose of examining the factor structure of workplace innovation. Survey data, extracted from the 2014 APS employee census, comprising 3,125 engineering professionals in the Commonwealth of Australia’s departments were analysed using exploratory factor analysis (EFA) and confirmatory factor analysis (CFA). EFA returned a two-factor structure explaining 69.1% of the variance of the construct. CFA revealed that a two-factor structure was indicated as a validated model (GFI = 0.98, AGFI = 0.95, RMSEA = 0.08, RMR = 0.02, IFI = 0.98, NFI = 0.98, CFI = 0.98, and TLI = 0.96). Both factors showed good reliability of the scale (Individual creativity: α = 0.83, CR = 0.86, and AVE = 0.62; Team Innovation: α = 0.82, CR = 0.88, and AVE = 0.61). These results confirm that the two factors extracted for characterising workplace innovation included individual creativity and team innovation.
Źródło:
Management and Production Engineering Review; 2017, 8, 2; 57-68
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of the heated water discharge on the water quality in a shallow lowland dam reservoir
Autorzy:
Mazierski, Jerzy
Kostecki, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/1845417.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
water quality
factor analysis
multivariate statistical analysis
Opis:
The purpose of the work was to determine the relationship between the of the water quality parameters in an artificial reservoir used as cooling ponds. Factor analysis were applied to analyze eighteen physico- -chemical parameters such as air and water temperature, dissolved oxygen concentration, visibility of the Secchi disk, concentrations of total nitrogen, ammonium, nitrate, nitrite, total phosphorus, phosphate, concentrations of calcium, magnesium, chlorides, sulfates and total dissolved salts, pH, chemical oxygen demand and electric conductivity from 2002-2019 to investigated cooling water discharge. Exploratory factor analysis allowed identified four factors were obtained from 54.1% (in discharge zone) to 56.7% (in dam zone). In discharge and pelagic zones confirmatory factor analysis showed that four latent variables: salinity, temperature, nitrogen and phosphorus provide good fit, but in the dam zone the better fit was obtained for the latent variables salinity, temperature, nutrient and eutrophic. Correlations between latent variables temperature, nitrogen, phosphorus or nutrient and eutrophic show a significant effect of temperature on the transformation of nitrogen and phosphorus compounds.
Źródło:
Archives of Environmental Protection; 2021, 47, 2; 29-46
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Joint Factor Analysis of Channel Mismatch in Whispering Speaker Verification
Autorzy:
Lv, G
Zhao, H.
Powiązania:
https://bibliotekanauki.pl/articles/176713.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
joint factor analysis
whisper
speaker verification
Opis:
A speaker recognition system based on joint factor analysis (JFA) is proposed to improve whisper- ing speakers’ recognition rate under channel mismatch. The system estimated separately the eigenvoice and the eigenchannel before calculating the corresponding speaker and the channel factors. Finally, a channel-free speaker model was built to describe accurately a speaker using model compensation. The test results from the whispered speech databases obtained under eight different channels showed that the correct recognition rate of a recognition system based on JFA was higher than that of the Gaussian Mixture Model–Universal Background Model. In particular, the recognition rate in cellphone channel tests increased significantly.
Źródło:
Archives of Acoustics; 2012, 37, 4; 555-559
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of environmetric methods to investigate control factors on water quality
Autorzy:
Boyacioglu, H.
Powiązania:
https://bibliotekanauki.pl/articles/205171.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
water quality
factor analysis
environmetric methods
discriminant analysis
Opis:
In the study, environmetric methods were successfully performed a) to explore natural and anthropogenic controls on reservoir water quality, b) to investigate spatial and temporal differences in quality, and c) to determine quality variables discriminating three reservoirs in Izmir, Turkey. Results showed that overall water quality was mainly governed by “natural factors” in the whole region. A parameter that was the most important in contributing to water quality variation for one reservoir was not important for another. Between summer and winter periods, difference in arsenic concentrations were statistically significant in the Tahtalı, Ürkmez and iron concentrations were in the Balçova reservoirs. Observation of high/low levels in two seasons was explained by different processes as for instance, dilution from runoff at times of high flow seeped through soil and entered the river along with the rainwater run-off and adsorption. Three variables “boron, arsenic and sulphate” discriminated quality among Balçova & Tahtalı, Balçova & Ürkmez and two variables “zinc and arsenic” among the Tahtalı & Ürkmez reservoirs. The results illustrated the usefulness of multivariate statistical techniques to fingerprint pollution sources and investigate temporal/spatial variations in water quality.
Źródło:
Archives of Environmental Protection; 2017, 43, 3; 17-23
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Technological Factors of Enterprise Innovation in a Strategic Perspective
Autorzy:
Rojek, Danuta
Powiązania:
https://bibliotekanauki.pl/articles/2023970.pdf
Data publikacji:
2021-12
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovativeness
technology
factor analysis
structural equation modeling
Opis:
Enterprise innovation is currently becoming a recognized factor of the competitiveness, survival, and development of companies in the market economy. Managers still need recommendations on ways of stimulating the growth of innovation in their companies. The objective of this paper is to identify the strategic factors of enterprise innovativeness in the area of technology, defined as the most important internal factors positively impacting the innovativeness of enterprises in a strategic perspective. Empirical studies were conducted using the Computer-Assisted Web Interview (CAWI) method on a purposive sample of N = 180 small and medium-sized innovative industrial processing enterprises in Poland. Data analysis was performed using Exploratory Factor Analysis within the Confirmatory Factor Analysis framework (E-CFA) and Structural Equation Modeling (SEM). Empirical research shows that the strategic factor of enterprise innovativeness in the area of technology is technological activity. A technologically active company should (1) possess a modern machinery stock, (2) conduct systematic technological audits, and (3) maintain close technical cooperation with the suppliers of raw materials, consumables, and intermediates. The implementation of the indicated recommendations by managers should lead to increased innovativeness of small and medium-sized industrial companies. The author recommends the use of the presented research procedure and data analysis methods in further studies.
Źródło:
Management and Production Engineering Review; 2021, 14, 4; 87-98
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utilization of environmetric & index methods as water quality comparative assessment tools focusing on heavy metal content
Autorzy:
Boyacioglu, H.
Powiązania:
https://bibliotekanauki.pl/articles/204558.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cluster analysis
factor analysis
heavy metal
pollution fingerprint
water quality index
Opis:
In the study suitability of water quality index approach and environmetric methods in fi ngerprinting heavy metal pollution as well as comparison of spatial variability of multiple contaminants in surface water were assessed in the case of The Gediz River Basin, Turkey. Water quality variables were categorized into two classes using factor and cluster analysis. Furthermore, soil contamination index was adapted to water pollution index and used to fi nd out the relative relationship between the reference standards and the current situation of heavy metal contamination in water. Results revealed that surface water heavy metal content was mainly governed by metal processing, textile and tannery industries in the region. On the other hand, metal processing industry discharges mainly degraded quality of water in Kemalpasa and Menemen. Furthermore, Kemalpasa region has been heavily affected from tannery and textile industries effl uents. Moreover, pollution parameters have not been infl uenced by changes in physical factors (discharge and temperature). This study indicated the effectiveness of water quality index approach and statistical tools in fi ngerprinting of pollution and comparative assessment of water quality. Both methods can assist decision makers to determine priorities in management practices.
Źródło:
Archives of Environmental Protection; 2012, 38, 3; 17-28
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Psychometric evaluation of the Polish students adaptation of the Aggression Questionnaire
Autorzy:
Krukowski, Maciej
Kornafel, Danuta
Oziembłowski, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/430213.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Aggression Questionnaire
Polish adaptation
Factor analysis
Gender differences
Cross-cultural difference
Opis:
The four-factor structure and psychometric properties of the Polish students adaptation of the Buss and Perry (1992) Aggression Questionnaire were investigated. The exploratory factor analyses of the responses of 604 Polish participants generally supported the four-factor model. The factors included Physical Aggression, Verbal Aggression, Anger and Hostility. The correlations between subscales, internal consistency and stability over time were evaluated and proved to be satisfactory. Apart from gender differences, 48 prison inmates and 48 students were interviewed to determine the validity of the Aggression Questionnaire by testing for hypothesized differences between groups. Aggression Questionnaire showed cross-cultural differences in aggression between various nations.
Źródło:
Polish Psychological Bulletin; 2012, 43, 3; 183-190
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Superficial and systemic diagnosis of family
Autorzy:
Świętochowski, Waldemar
Powiązania:
https://bibliotekanauki.pl/articles/430197.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
assessment of family system
systemic traits
factor analysis in family research
Opis:
The distinction between two types of diagnosis of family was inspired by the concept of surface and source features of personality by R.B. Cattell. By means of existing psychological questionnaires we can only know the surface of consciously available mental phenomena. The same is true in the diagnosis of family. The McMaster model of family, systemic in its assumptions, developed research tools giving access only to the surface of the phenomena. Although they are divided into certain thematic categories they do not reveal what is really important in the family system. In this article, the author, after a detailed discussion of one of the tests based on the McMaster theoretical model, is attempting to identify the source features (here: unavailable for conscious cognition) of the family, hereinafter called systemic traits. In this research the exploration factor analysis was used. Three perspectives of the opinion of the family were maintained (like in the Family Assessment Measure). Factor analysis allowed identification of three factors for each perspective of the family assessment. Confirmative analysis proved a satisfactory match (using RMSEA, GFI and AGFI statistics). The accuracy of the identified systemic model was then tested by a confirmation study (confirmative factor analysis using Amos from SPSS). The authors also prepared a provisional questionnaire for measuring these systemic traits of the family. The tool proved to be promising and the work worth continuing. Incidentally, it turned out that the characteristics of the family system are relatively independent of personality traits of family members.
Źródło:
Polish Psychological Bulletin; 2010, 41, 3; 113-121
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance evaluation on selection of formwork systems in high rise buildings using regression analysis and their impacts on project success
Autorzy:
Rajeshkumar, Viswanathan
Sreevidya, V.
Powiązania:
https://bibliotekanauki.pl/articles/962264.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
deskowanie
system deskowania
analiza czynnikowa
korelacja
analiza regresji
formwork system
factor analysis
correlation
regression analysis
Opis:
The selection of the formwork system for high rise building affects the entire construction project duration and cost. The study reports the factors influencing the selection of different formwork system in the construction of high rise buildings through structural questionnaire survey from the client, contractor, consultant, and interviews with expert members. Total of 40 technical factors was identified from the literature and 220 filled questionnaires were received from the respondent. Relative Importance Index method is used to find the topmost factors affecting the selection of formwork system. Additionally, from factor analysis 22 factors were identified to have a correlation with one another. Regression analysis reveals that duration of the project, maintenance cost, adaptability, and safety have impact on formwork selection across time, cost and quality. These findings could potentially increase the construction company’s existing knowledge in relation to formwork selection.
Źródło:
Archives of Civil Engineering; 2019, 65, 2; 209-222
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measuring agility of indian automotive small & medium sized enterprises (SMEs)
Autorzy:
Tiwari, Rupesh Kumar
Tiwari, Jeetendra Kumar
Powiązania:
https://bibliotekanauki.pl/articles/407171.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
exploratory factor analysis
multiple regression analysis
fuzzy logic
fuzzy integrated index
FII
fuzzy performance index
FPII
fuzzy ranking
Opis:
Indian SMEs are going to play pivotal role in transforming Indian economy and achieving double digit growth rate in near future. Performance of Indian SMEs is vital in making India as a most preferred manufacturing destination worldwide under India’s “Make in India Policy”. Current research was based on Indian automotive SMEs. Indian automotive SMEs must develop significant agile capability in order to remain competitive in highly uncertain global environment. One of the objectives of the research was to find various enablers of agility through literature survey. Thereafter questionnaire administered exploratory factor analysis was performed to extract various factors of agility relevant in Indian automotive SMEs environment. Multiple regression analysis was applied to assess the relative importance of these extracted factors. “Responsiveness” was the most important factor followed by “Ability to reconfigure”, “Ability to collaborate”, and “Competency”. Thereafter fuzzy logic bases algorithm was applied to assess the current level of agility of Indian automotive SMEs. It was found as “Slightly Agile”, which was the deviation from the targeted level of agility. Fuzzy ranking methodology facilitated the identification & criticalities of various barriers to agility, so that necessary measures can be taken to improve the current agility level of Indian automotive SMEs. The current research may helpful in finding; key enablers of agility, assessing the level of agility, and ranking of the various enablers of agility to point out the weak zone of agility so that subsequent corrective action may be taken in any industrial environment similar to India automotive SMEs.
Źródło:
Management and Production Engineering Review; 2019, 10, 1; 58-67
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Classification of the bid/no bid criteria - factor analysis
Klasyfikacja czynników przetargowych - analiza czynnikowa
Autorzy:
Leśniak, A.
Powiązania:
https://bibliotekanauki.pl/articles/231082.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
oferta przetargowa
czynnik przetargowy
decyzja przetargowa
wykonawca budowlany
analiza czynnikowa
tender
bid/no bid factor
bidding decision
contractor
factor analysis
Opis:
For the construction company, tendering is the most popular way of acquiring contracts. The decision to participate in the tender needs to be made carefully, as it affects the condition of the company and is an important aspect in its quest for success. The bid/no bid decision making is a complex process involving a number of factors. The research carried out so far has mainly concerned the identification of the various kinds of influences on contractors’ bidding decisions. The researchers, on the basis of contractors’ opinions, created rank lists in an attempt to categorize the factors. In this paper the author employs factor analysis which belongs to basic methods of multi-dimensional data analysis. The paper’s aim is first to depict an output set of observed variables, that is bid/no bid factors, in terms of a smaller set of latent variables which cannot be directly observed and then to interpret the dependencies between them.
Wybór przetargu, do którego startuje przedsiębiorstwo jest bardzo ważny w aspekcie budowania jego pozycji na rynku. Umiejętność wyboru odpowiednich zleceń decyduje o ogólnej kondycji i sukcesie firmy, a nawet o jej przetrwaniu na rynku. Podjęcie decyzji o przystąpieniu do przetargu uwarunkowane jest wieloma czynnikami związanymi zarówno z przedsiębiorstwem, jak i przedsięwzięciem, którego dotyczy przetarg. Na świecie podjęto dotychczas szereg prób identyfikacji czynników mających wpływ na decyzje o uczestniczeniu w przetargu, a te z kolei przyczyniły się do budowy modeli wspomagających podjęcie tych decyzji. W artykule podjęto próbę wykrycia kluczowych kryteriów determinujących podejmowane decyzje przetargowe, których obserwowalnym efektem są konkretne czynniki zidentyfikowane na podstawie literatury przedmiotu i badań ankietowych. W tym celu zastosowano analizę czynnikową. Sposoby pozyskiwania wykonawców na rynku budowlanym zależą od rodzaju rynku, rodzaju zamówienia i jego wartości. W przypadku sektora prywatnego to inwestor sam decyduje jaka forma poszukiwania wykonawcy jest dla niego najkorzystniejsza. W przypadku sektora publicznego zamawiający zobowiązany jest do przestrzegania ustawy Prawo Zamówień Publicznych z dnia 29 stycznia 2004 r. z późn.zm. Najczęściej stosowanym trybem udzielania z zamówień publicznych na roboty budowlane jest przetarg nieograniczony. Jest to podstawowy tryb, dopuszczany przez ustawę w każdym przypadku i posiadający istotne zalety: brak przesłanek do stosowania, wysoki stopień konkurencyjności, nieskomplikowana procedura i krótki czas postępowania.
Źródło:
Archives of Civil Engineering; 2015, 61, 4; 79-90
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prioritization of barriers to lean implementation in Indian automotive small & medium sized enterprises
Autorzy:
Tiwari, R. K.
Tiwari, J. K.
Powiązania:
https://bibliotekanauki.pl/articles/406822.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
lean barriers
prioritization
Indian automotive SMEs
confirmatory factor analysis
multiple regression
analytic network process
super decision software
Opis:
Lean manufacturing has been the most deliberated concept ever since its introduction. Many organization across the world implemented lean concept and witnessed dramatic improvements in all contemporary performance parameters. Lean manufacturing has been a sort of mirage for the Indian automotive industry. The present research investigated the key lean barriers to lean implementation through literature survey, confirmatory factor analysis, multiple regression, and analytic network process. The general factors to lean implementation were inadequate lean planning, resource constraints, half-hearted commitment from management, and behavioral issues. The most important factor in the context of lean implementation in Indian automotive industry was inadequate lean planning found with the help of confirmatory factor analysis and multiple regression analysis. Further analysis of these extracted factors through analytic network process suggested the key lean barriers in Indian automotive industry, starting from the most important were absence of proper lean implementation methodology, lack of customer focus, absence of proper lean measurement system, inadequate capital, improper selection of lean tools & practices, leadership issues, resistance to change, and poorly defined roles & responsibilities. Though literature identifying various lean barriers are available. The novelty of current research emerges from the identification and subsequent prioritization of key lean barriers within Indian automotive SMEs environment. The research assists in smooth transition from traditional to lean system by identifying key barriers and developing customized framework of lean implementation for Indian automotive SMEs.
Źródło:
Management and Production Engineering Review; 2018, 9, 2; 69-79
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ekwiwalentność pomiaru skali zaufania politycznego w Europejskim Sondażu Społecznym
Cross-Country Measurement Equivalence of Political Trust in the European Social Survey
Autorzy:
Jabkowski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/428066.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
zaufanie polityczne
ekwiwalentność pomiaru
konfirmacyjna analiza czynnikowa
Europejski Sondaż Społeczny
political trust
measurement equivalence
confirmatory factor analysis
European Social Survey
Opis:
Jednym z podstawowych celów realizacji sondaży o charakterze porównawczym jest wnioskowanie o międzykulturowych różnicach opartych na pomiarze pewnych konstruktów latentnych. Porównania takie są uzasadnione, jeśli tylko owe konstrukty mierzą w każdym kraju to samo oraz w taki sam sposób. Celem tego artykułu jest weryfikacja hipotezy o ekwiwalentności pomiaru skali zaufania politycznego w dwudziestu krajach uczestniczących w siódmej rundzie Europejskiego Sondażu Społecznego. Analiza stopnia dopasowania modeli pomiarowych opartych na równaniach strukturalnych pozwoliła przyjąć hipotezę o konfiguralnej oraz metrycznej ekwiwalentności pomiaru skali zaufania politycznego. Jednocześnie odrzucono hipotezę o pełnej inwariancji skalarnej tego konstruktu, przy czym najbardziej problematyczny okazał się pomiar wskaźnika zaufania do systemu prawnego. Na zakończenie ukazano możliwości wnioskowania o międzykrajowych różnicach w poziomie zaufania politycznego, pomimo odrzucenia hipotezy o pełnej inwariancji pomiarowej tego konstruktu.
One of the main goals of cross-cultural surveys is to compare countries on the basis of values of latent constructs. Such comparisons are only permissible, however, if the measurement process complies with cross-country equivalence. Using the data form the 7th wave of the European Social Survey, this article investigates whether the measurement of political trust is country invariant. The use of configural and metric equivalence tests demonstrate that this construct can be considered reliable and cross-country valid. However, if one applies stricter scalar equivalence test, the measurement of political trust is not fully invariant, and especially the item on trust in the legal system is posing major problems in a number of countries. This article is concluded by testing the concurrent validity of political trust scale and by offering some suggestions on how to compare European countries, even if the measurement of political trust is not fully cross-country invariant.
Źródło:
Studia Socjologiczne; 2018, 2(229); 65-92
0039-3371
Pojawia się w:
Studia Socjologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification and prioritization of factors influencing the increase in construction costs of building investments using factor analysis
Autorzy:
Seyedebrahimi, Seyedkazem
Mirjalili, Alireza
Sadeghian, Abolfazl
Powiązania:
https://bibliotekanauki.pl/articles/1852306.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
koszt
projekt budowlany
analiza hierarchiczna
Yazd
czynnik zarządzania
czynnik środowiskowy
czynnik prawno-administracyjny
cost
construction project
hierarchical analysis
management factor
environmental factor
legal and administrative factor
Opis:
A large portion of the credits and financial resources of countries is spent on the preparation and construction of building projects because their implementation would create housing, job opportunities, financial turnover, and economic prosperity. At present, many construction projects are under construction in developing countries, and most of these projects are facing rising costs. The local scope of this research is construction projects in Yazd city. This research is operational in terms of purpose and was carried out in a descriptive and survey manner with an analytical-mathematical method. Data collection was done by documentary and survey methods. The Statistical Society consisted of 150 managers and officials, contractors, and actors involved in construction projects. Data analysis by hierarchical analysis technique showed that the criterion of management factors with a weight of 0.582 has the highest priority in increasing building costs. The criterion of environmental factors with a weight of 0.309 is at the second priority. The criterion of legal and administrative factors with a weight of 0.109 is in the third priority. Therefore, a key element in increasing the cost of construction projects in the under-studied city is the management factor that can be reduced by establishing new management systems and improving the quality of construction projects.
Źródło:
Archives of Civil Engineering; 2021, 67, 3; 705-722
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic mechanical characterization of epoxy composite reinforced with areca nut husk fiber
Autorzy:
Muralidhar, N.
Kaliveeran, Vadivuchezhian
Arumugam, V.
Srinivasula Reddy, I.
Powiązania:
https://bibliotekanauki.pl/articles/139576.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
areca nut husk fiber
dynamic mechanical analysis
storage modulus
loss modulus
elastic modulus
damping factor
Opis:
Natural fiber polymer composites are gaining focus as low cost and light weight composite material due to the availability and ecofriendly nature of the natural fiber. Fiber composites are widely used in civil engineering, marine and aerospace industries where dynamic loads and environmental loads persist. Dynamic analysis of these composites under different loading and environmental conditions is essential before their usage. The present study focuses on the dynamic behavior of areca nut husk reinforced epoxy composites under different loading frequencies (5 Hz, 10 Hz and 15 Hz) and different temperatures (ranging from 28◦C to 120◦C). The effect of loading and temperature on storage modulus, loss modulus and glass transition temperature was analyzed. Increase in storage modulus is observed with increase in loading frequency. The storage modulus decreases with increase in temperature. The glass transition temperature of the composite is determined to be 105◦C. The elastic modulus calculated from the DMA data is compared with three point bending test
Źródło:
Archive of Mechanical Engineering; 2020, LXVII, 1; 57-72
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 31

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