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Wyświetlanie 1-15 z 68
Tytuł:
The effect of oxygenated diesel-n-butanol fuel blends on combustion, performance, and exhaust emissions of a turbocharged crdi diesel engine
Autorzy:
Labeckas, G.
Slavinskas, S.
Rudnicki, J.
Zadrąg, R.
Powiązania:
https://bibliotekanauki.pl/articles/259929.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
diesel engine
diesel-n-butanol blends
combustion phenomenon
performance efficiency
smoke
pollutant emissions
Opis:
The article deals with the effects made by using various n-butanol-diesel fuel blends on the combustion history, engine performance and exhaust emissions of a turbocharged four-stroke, four-cylinder, CRDI 1154HP (85 kW) diesel engine. At first, load characteristics were taken when running an engine with normal diesel fuel (DF) to have ‘baseline’ parameters at the two ranges of speed of 1800 and 2500 rpm. Four a fossil diesel (class 1) and normal butanol (n-butanol) fuel blends possessing 1 wt%, 2 wt%, 3 wt%, and 4 wt% (by mass) of n-butanol-bound oxygen fractions were prepared by pouring 4.65 wt% (BD1), 9.30 wt% (BD2), 13.95 wt% (BD3), and 18.65 wt% (BD4) n-butanol to diesel fuel. Then, load characteristics were taken when an engine with n-butanol-oxygenated fuel blends at the same speeds. Analysis of the changes occurred in the autoignition delay, combustion history, the cycle-to-cycle variation, engine efficiency, smoke, and exhaust emissions NOx, CO, THC obtained with purposely designed fuel blends was performed on comparative bases with the corresponding values measured with ‘baseline’ diesel fuel to reveal the potential developing trends.
Źródło:
Polish Maritime Research; 2018, 1; 108-120
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structured catalytic reactor for VOC combustion
Autorzy:
Kołodziej, A.
Łojewska, J.
Kleszcz, T.
Powiązania:
https://bibliotekanauki.pl/articles/778459.pdf
Data publikacji:
2007
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
katalizator strukturalny
siatka
transport masy
structured catalyst
gauze
mass transfer
diffusional limitation
performance efficiency
Opis:
VOC emission has recently become a challenge for environmental protection. Catalytic combustion seems a promising method of VOC removal, however, there are still more specific demands concerning the process. The reactor design has to assure enhanced transfer properties accompanied by low flow resistance to reduce the pumping costs. Neither the packed beds nor the classic ceramic monoliths are able to fulfil the requirements. To solve the problem we propose a wire gauze structure composed of several gauze sheets staked. A number of mass transfer and flow resistance experiments were performed for two gauze types and correlations were derived for the Sherwood number and the friction factor. The results were found to be in a reasonable agreement with the literature available. The studied gauze structures were compared with a classic monolith for the assumed case study. The calculated length of the gauze structured reactor was significantly shorter, up to ten times, when compared with a classic ceramic monolith, but the pressure drop was higher.
Źródło:
Polish Journal of Chemical Technology; 2007, 9, 1; 10-14
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Managerial tools for performance measurement
Autorzy:
Aschenbrennerova, H.
Dvorakova, L.
Powiązania:
https://bibliotekanauki.pl/articles/117646.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
performance measurement
cost efficiency
productivity
effectiveness
Opis:
Managerial performance evaluation styles continue to be an important area of management accounting research and practice. Traditional performance measurement systems are mostly based on traditional financial evaluation but it is necessary to focus on non-financial identifications as well. The aim of this article is to design a new approach to performance measurement system classification for small and medium sized industrial companies.
Źródło:
Applied Computer Science; 2006, 2, 1; 64-82
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The relationship between transformational leadership, improving employee’s peerformance and the raising efficiency of organizations
Autorzy:
Garad, Askar
Haryono, Siswoyo
Yaya, Rizal
Pratolo, Suryo
Rahmawati, Alni
Powiązania:
https://bibliotekanauki.pl/articles/2127529.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
transformational leadership
employee performance
organization efficiency
Opis:
This study aims to identify the impact of transformational leadership in improving the performance of employees and its impact on raising the efficiency of organizations by considering that transformational leadership is one of the successful leadership methods to achieve the effectiveness and efficiency of organizations and improve their performance. In this paper, a systematic literature review of existing international papers is used. the meta-analysis method was used to analyze the articles published in scientific journals with high evaluation indexed in Scopus. Through the analysis process, application (WordStat 8) was used to investigate articles and summarize the descriptive statistics, correlation, and cloud keywords. The results reveal the effectiveness of transformational leadership on job performance. whenever managerial leaderships possess the attributes and characteristics of a transformational leader, including positive influence, inspirational motivation, and individual consideration, the more their subordinates will have creative skills and abilities. Also, the results indicate that the leader who possesses the characteristics of a transformational leader contributes significantly to the development of the capabilities of his subordinates, which is positively reflected in the upgrading of the organization’s efficiency. In this paper, we present identifiable patterns in the relationship between transformational leadership, improving employee performance, and the raising efficiency of organizations. Then we suggest emerging core topics that deserve more academic attention. This paper’s added value is that it undertakes a thorough and complete assessment of the relationship between transformational leadership, boosting employee performance, and increasing organizational efficiency. It also includes a written review of the work as well as an updated reference index covering the years 2011 to 2020, making it valuable for academics and professionals alike.
Źródło:
Management and Production Engineering Review; 2022, 13, 2; 15--30
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficiency, customers’ satisfaction and deposit money banks’ performance in Nigeria
Autorzy:
Worimegbe, Powel Maxwell
Abosede, Adebiyi Julius
Worimegbe, Temitope Mariam
Powiązania:
https://bibliotekanauki.pl/articles/522525.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Bank efficiency
Bank performance
Customers’ satisfaction
Opis:
Aim/purpose – The study seeks to explore the technical efficiency of Nigerian banks using production approach and; to establish the relationship that exists between technical efficiency, customers’ satisfaction and bank performance in the face of a volatile economy. Design/methodology/approach – Data used in achieving the research objectives were from both primary and secondary sources. The Data Envelopment Analysis (DEA) and Structural Equation Model (SEM) were employed in the analysis of data. 600 hundred questionnaires from 18 deposit money banks. Findings – The study reveals that technical efficiency leads to customers’ satisfaction. The findings also show that customers’ satisfaction affects bank performance. Further- more, efficiency influences banks’ financial performance and this indicates that banks that pursue improved financial performance using a singular approach may be fundamentally misguided. Research implications/limitations – The study has important implications because it suggests that Deposit Money Banks should concentrate effort firstly on efficiency before customers’ satisfaction. Bank managers should also seek better way of meeting customers need thereby increasing their customers’ satisfaction and increasing bank financial performance. The study is limited in scope since it does not look at other approaches in measuring bank efficiency; further studies should consider using intermediation, user-cost, asset, modern and value-added model approaches in measuring bank efficiency. Originality/value/contribution – The study focuses solely on deposit money banks in Nigeria and empirically analyses the effect of efficiency, customers’ satisfaction on financial performance of deposit money banks in Nigeria. Keywords: Bank efficiency, customers’ satisfaction, bank performance. JEL Classification: C19 G21 G29.
Źródło:
Journal of Economics and Management; 2018, 31; 133-148
1732-1948
Pojawia się w:
Journal of Economics and Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement and evaluation of the public administration performance through delivery of electronic services
Autorzy:
Batalli, Mirlinda
Powiązania:
https://bibliotekanauki.pl/articles/1036566.pdf
Data publikacji:
2015
Wydawca:
Academicus. International Scientific Journal publishing house
Tematy:
e-services
measurement
evaluation
performance
efficiency
Opis:
The purpose of this paper concerns the relation between delivery of electronic services (e-services) and evaluation of public administration performance. Public sector organizations should pay attention and determine the strategies to be followed in order to increase the satisfaction of citizens and businesses in relation to delivery of electronic services. The study aims to review the demands toward progress to the competitiveness, the sustainability, efficiency and effectives in public administration that have rapidly enforced the wide reforms in the public sector, in order to modernize the initiatives to offer better electronic services for the citizens. The article aims to present that the transformation process toward providing electronic services to the citizens should be assessed continuously, in light with challenges, demands and process of globalization, in order to strengthen the capacities of public administration and make it more efficient. In this regard, the regular evaluation and measurement of the public administration performance leads toward the promotion of enhanced public services and higher level of accountability. Through receiving the e-services, citizens can save their time, can reduce the expenses and create an easier access of communication with all levels of the government.
Źródło:
Academicus International Scientific Journal; 2015, 12; 169-179
2079-3715
2309-1088
Pojawia się w:
Academicus International Scientific Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental research on separation efficiency of aerosol particles in vortex tube separators with electric field
Autorzy:
Dziubak, T.
Powiązania:
https://bibliotekanauki.pl/articles/202024.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
vortex tube separator
electric fields
separation efficiency and filtration performance
pressure drop across the cyclone separator
experimental research
Opis:
A comparative analysis of filtration performance of tangential and axial inlet reverse-flow cyclone separators and vortex tube separators is presented. The study showed that vortex tube separators are characterized by a quality factor q several time higher than tangential inlet reverse-flow cyclone separators. The cyclone separators yield low separation efficiency and low filtration performance at low air flow rates at low air volumes aspired by the engine at low speed. One of the well-known and not commonly used methods to improve separation efficiency is to apply electric field. An original design of a vortex tube separator with insulators generating electric field in the area of aerosol flow is presented. High voltage was applied to the cyclone separator housing and its swirl vane. A special method and test conditions were developed for cyclone separators with electric field. Separation efficiency, filtration performance and pressure drop across the cyclone separator in two different variants were determined. The tests were carried out at five inlet velocity of cyclones υ0 = 1.75; 3.5; 7.0; 10.5; 14 m/s at an extraction rate of m0 = 10%, and at an average dust concentration in the inlet air of s = 1 g/m3. Using the electric field in the area of a swirling aerosol stream resulted in an increase (over 12% – φ c = 96.3%) in separation efficiency at inlet velocity of cyclone ranging from 1.75 to 3.5 m/s. An increase in separation efficiency at other inlet velocity of cyclone is minor and does not exceed 3‒4%.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 3; 503-516
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Examinations of effective efficiency of a car engine in non-stationary work conditions from torque load
Autorzy:
Ubysz, A.
Powiązania:
https://bibliotekanauki.pl/articles/245343.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
engine performance maps
specific fuel consumption
effective efficiency
Opis:
Measuring method and calculations of the impact of non-stationary work conditions of car engine torque load upon its effective efficiency have been presented in the paper. The obtained results have been compared to the already achieved results. The applied method of calculation balance and the consumed fuel enabled the writer of the paper to calculate the value of the change of unitary fuel consumption at a work point on engine performance map. The carried out examinations focus on measurements at one measuring length and so the rate of torque load at each of the four gear box ratio (2-5) can be controlled by constant final velocity of driving or by shifting or extending the measuring length against the lowest point ( the measuring length is 'U'-shaped). Finding the right solution to this problem will allow elaborating the calculation algorithm of engine effective efficiency for the examined range of engine performance maps for changeable, non-stationary work conditions. The results make it ąuite explicit that non-stationary work conditions from the engine speed and the engine load impair the effective efficiency of the engine at work in particular gears. Non-stationary mode of engine operation is essential for the higher values of gear box ratio whereas for lower values the engine load really matters.
Źródło:
Journal of KONES; 2009, 16, 4; 463-468
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Server Workload Model Identification: Monitoring and Control Tools for Linux
Autorzy:
Karpowicz, M.
Arabas, P.
Powiązania:
https://bibliotekanauki.pl/articles/307868.pdf
Data publikacji:
2016
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
cloud computing
energy efficiency
Linux
server performance meterin
Opis:
Server power control in data centers is a coordinated process carefully designed to reach multiple data center management objectives. The main objectives include avoiding power capacity overloads and system overheating, as well as fulfilling service-level agreements (SLAs). In addition to the primary goals, server control process aims to maximize various energy efficiency metrics subject to reliability constraints. Monitoring of data center performance is fundamental for its efficient management. In order to keep track of how well the computing tasks are processed, cluster control systems need to collect accurate measurements of activities of cluster components. This paper presents a brief overview of performance and power consumption monitoring tools available in the Linux systems.
Źródło:
Journal of Telecommunications and Information Technology; 2016, 2; 5-12
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Does competitively distinct operation enable performance in turbulent business environment? A study on finnish SMEs
Autorzy:
Timilsina, B.
Powiązania:
https://bibliotekanauki.pl/articles/407129.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
competitively distinct operations
high efficiency operations
turbulent business environment
operational performance
financial performance
Opis:
Aligning resource choice and operations decision in the value chain (input-process-output) is one of the most important functions of a firm not only to make its operations to be competitively distinct but also very important for the firm’s growth and survival. However, the role of competitively distinct operations in maintaining better performance in dynamic and changing business environment has remained unclear. Therefore, this paper examined the relationship between competitively distinct operations, high efficiency operations and operational performance (research model one). In the similar manner the relationship between turbulent business environments, operational performance and financial performance were also examined (research model two). The study was conducted considering survey responses from 61 small and medium size enterprises from Finland. Correlation test and structural path modelling was used to test and validate the proposed hypothesis and research model. The results showed that competitively distinct operation enables high efficiency operations, which influences operational performance positively and significantly. In the similar manner, operational performance influences financial performance positively and significantly. Likewise, turbulent business environment was found to have a negative impact on operational and financial performance. The research findings are found to be adequate enough to highlight the importance of aligning resource choice and operations decisions in reducing the impact of turbulent business environment on organizational performance.
Źródło:
Management and Production Engineering Review; 2016, 7, 3; 94-104
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Personality Traits and Sales Effectiveness: The Life Insurance Market in Poland
Autorzy:
Janowski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/475121.pdf
Data publikacji:
2018
Wydawca:
Fundacja Upowszechniająca Wiedzę i Naukę Cognitione
Tematy:
competitive advantage
efficiency
human performance
management
organization
personality traits
Opis:
Within organizations in industrialized countries, the quality of human resources tends to become a major issue on the path to achieving a competitive advantage. According to the author’s research, the implementation of the five-factor model of Costa and McCrae provides the solution for the abovementioned problem. This article demonstrates the crucial utility of the five-factor model of Costa and McCrae in the context of life insurance industry effectiveness from both the theoretical and practical perspectives based on a case study of the four largest life insurance companies 796 most effective agents. Results imply the existence of a positive correlation between the level of the selected personality traits intensities and the life insurance agent’s sales efficiency. Moreover, as levels of the personality traits of “openness to experience,” “consciousness,” “agreeableness” and “neuroticism” are the predictors of life insurance company effectiveness, there are fundamentals for induction to be appropriate for the whole retail financial sector human resources management system.
Źródło:
Journal of Entrepreneurship, Management and Innovation; 2018, 14, 1; 143-160
2299-7075
2299-7326
Pojawia się w:
Journal of Entrepreneurship, Management and Innovation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Indebtedness, Fiscal Discipline and Development Spending – A Non-parametric Approach
Autorzy:
Sinha, Ram Pratap
Powiązania:
https://bibliotekanauki.pl/articles/2075409.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Indian states
fiscal performance
efficiency
data envelopment analysis
bootstrap
Opis:
Indian states exhibit considerable heterogeneity in terms of revenue mobilizing capacities and efforts, development spending and fiscal dependence on the central government. In this context, the paper compares the fiscal performance of major Indian states in terms of two non-parametric performance evaluation models for the period 2009–10 to 2014–15. The study thus uses the conventional two stage framework for efficiency evaluation as well as the two stage conditional performance model. The outcomes enable us to identify front-runners as well as laggards in the area of fiscal management. Further, the study showed that the gross capital formation experienced by the states significantly influences state performance in India. However, the impact of outstanding liabilities on efficiency performance was statistically insignificant
Źródło:
Central European Journal of Economic Modelling and Econometrics; 2021, 2; 147-173
2080-0886
2080-119X
Pojawia się w:
Central European Journal of Economic Modelling and Econometrics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Creating Value For The Organization Through Marketing
Autorzy:
Garbarski, Lechosław
Powiązania:
https://bibliotekanauki.pl/articles/417271.pdf
Data publikacji:
2014-12-15
Wydawca:
Akademia Leona Koźmińskiego w Warszawie
Tematy:
marketing performance
values
marketing effectiveness
marketing efficiency
marketing productivity
Opis:
Purpose: Analyzing value created by marketing should cover at least two important points of view. The first is related to the problem of value created by marketing for customers, and the second is related to the value created for the organization (enterprise). This article is focused on the second point of view. Each organization formulates some expectations toward marketing, and next evaluates the results of using marketing in a more or less systematic way. The purpose of the article is to establish a theoretical model of this evaluation using three dimensions: marketing effectiveness, marketing efficiency and marketing productivity. Methodology: This study was of a conceptual character. Findings: In presented concept, the expectations toward marketing and value created by marketing are expressed by marketing performance. In turn, marketing performance can be perceived in the three dimensions of marketing effectiveness, marketing efficiency and marketing productivity Originality: The problem of value created by marketing for the organization (enterprise) isn’t too often analyzed in the literature. Existing literature offers an analysis all these dimensions but in most cases in separate way or with some important inconsequences.
Źródło:
Management and Business Administration. Central Europe; 2014, 22, 4; 60-69
2084-3356
Pojawia się w:
Management and Business Administration. Central Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance analysis of multipurpose refrigeration system (MRS) on fishing vessel
Autorzy:
Ust, Y.
Karakurt, A.
Gunes, U.
Powiązania:
https://bibliotekanauki.pl/articles/258796.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
refrigeration cycles
exergy analysis
exergetic performance coefficient
COP
exergy efficiency
Opis:
The use of efficient refrigerator/freezers helps considerably to reduce the amount of the emitted greenhouse gas. A two-circuit refrigerator-freezer cycle (RF) reveals a higher energy saving potential than a conventional cycle with a single loop of serial evaporators, owing to pressure drop in each evaporator during refrigeration operation and low compression ratio. Therefore, several industrial applications and fish storage systems have been utilized by using multipurpose refrigeration cycle. That is why a theoretical performance analysis based on the exergetic performance coefficient, coefficient of performance (COP), exergy efficiency and exergy destruction ratio criteria, has been carried out for a multipurpose refrigeration system by using different refrigerants in serial and parallel operation conditions. The exergetic performance coefficient criterion is defined as the ratio of exergy output to the total exergy destruction rate (or loss rate of availability). According to the results of the study, the refrigerant R32 shows the best performance in terms of exergetic performance coefficient, COP, exergy efficiency, and exergy destruction ratio from among the other refrigerants (R1234yf, R1234ze, R404A, R407C, R410A, R143A and R502). The effects of the condenser, freezerevaporator and refrigerator-evaporator temperatures on the exergetic performance coefficient, COP, exergy efficiency and exergy destruction ratios have been fully analyzed for the refrigerant R32.
Źródło:
Polish Maritime Research; 2016, 2; 48-56
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genetic variants of uncoupling proteins-2 and -3 in relation to maximal oxygen uptake in different sports
Autorzy:
Holdys, Joanna
Gronek, Piotr
Kryściak, Jakub
Stanisławski, Daniel
Powiązania:
https://bibliotekanauki.pl/articles/1039610.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
UCP2
athletic performance
genetic polymorphism
UCP3
energy efficiency
Opis:
Uncoupling proteins 2 and 3 (UCP2 and UCP3) as mitochondrial electron transporters are involved in regulation of ATP production and energy dissipation as heat. Energy efficiency plays an important role in physical performance, especially in aerobic fitness. The aim of this study was to examine the association between maximal oxygen uptake and genetic variants of the UCP2 and UCP3 genes. The studies were carried out in a group of 154 men and 85 women, professional athletes representing various sports and fitness levels and students of the University of Physical Education in Poznań. Physiological and molecular procedures were used, i.e. direct measurement of maximum oxygen uptake (VO2max) and analysis of an insertion/deletion (I/D) polymorphism in the 3'untranslated region of exon 8 of the UCP2 gene and a C>T substitution in exon 5 (Y210Y) of the UCP3 gene. No statistically significant associations were found, only certain trends. Insertion allele (I) of the I/D UCP2 and the T allele of the UCP3 gene were favourable in obtaining higher VO2max level and might be considered as endurance-related alleles.
Źródło:
Acta Biochimica Polonica; 2013, 60, 1; 71-75
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
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