Wyniki wyszukiwania - BazTech

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The influence of intake valve close timing on the environmental performance of a spark ignition engine using gasoline and natural gas

Vipartas Tadas, Rimkus Alfredas, Matijošius Jonas

Transport Problems

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2023

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T. 18, z. 3

175--187

EN

The tightening of environmental requirements has forced car manufacturers to look for various ways to reduce exhaust gas emissions. The existing structural solutions of internal combustion engines allow this type of pollution to be reduced by adjusting the intake valve timing. This is especially relevant when it comes to reducing spark ignition engine emissions when using natural gas as fuel. In this study, a wide range of intake valve timing adjustments from 24° to 54° every six crank angle degrees was taken at a constant engine speed (n = 2500 rpm) and different loads and fixed excess air ratios (λ = 1). The changes in oxygen (O2), carbon monoxide (CO), carbon dioxide (CO2), nitrous oxide (NOx), methane (CH4), and propane (C3H8) gas emissions were observed in the aforementioned intake valve timing range.

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Impact of information technology resources on environmental performance: mediating role of internal green supply chain integration

Hashmi Syed Danial, Naz Iram, Waqas Muhammad Atif, Sahar Najam us

LogForum

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2023

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Vol. 19, no. 2

211--223

EN

Background: Information technology (IT) resources can play an important role in helping firms overcome the environmental issues they face by facilitating green supply chain management. This study examines the relationship between IT resources, specifically IT infrastructure resources, IT human resources and IT relationship resources, and the environmental performance of textile firms. Further, the study examines the mediating role of green supply chain integration on this relationship. Methods: The study collected data from 512 executives working in the textile sector in the Punjab province of Pakistan, where green supply chain integration is being practiced. Smart PLS has been used for estimation results. Results: The results of the study show that IT resources in the form of IT infrastructure resources, IT human resources and IT relationship resources have a significant association with the environmental performance of firms. Likewise, structural equation modeling (SEM) confirms that green supply chain integration mediates this relationship. Conclusions: The results of the study demonstrate that the improvement of IT resources can help companies achieve their environmental performance targets. Likewise, the results also suggest that companies should work on achieving green supply chain integration as it can improve their environmental performance.

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Impact of green supply chain management on financial and environmental performance: mediating role of operational performance and the moderating role of external pressures

Hashmi Syed Danial, Akram Saqib

LogForum

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2021

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Vol. 17, no. 3

359--371

EN

Background: Green supply chain management (GSCM) practices are considered as vital practices in tackling environmental issues faced by firms. This study examines the relationship between GSCM, environmental and financial performance of firms. Further, the study examines the mediating role of operational performance between the relationships of GSCM-environmental performance and GSCM-financial performance. Additionally, the moderating role of external pressures (regulatory and customer pressures) has been examined on the relationship of GSCM and operational performance. Methods: Data from 277 executives working in different industries of Pakistan (where GSCM practices have been adopted) has been collected for the study. Results: The results of the mediated regression analysis confirm the partial mediation of operational performance between GSCM, environmental and financial performance. The results of moderated regression analysis confirm that presence of external pressures enhances the relationship between GSCM and operational performance. Conclusions: These results suggest that the adoption of GSCM practices in Pakistan can be fruitful for the companies. Mandatory requirement by regulatory authorities can also be helpful in adoption of the GSCM practices which ensure environmental performance of firms and consequently the betterment of overall environment.

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Wyniki prośrodowiskowe w łańcuchach dostaw – ujęcie kontekstualne

Maryniak A.

Problemy Jakości

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2018

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R. 50, nr 6

33--38

PL

Celem niniejszych rozważań jest zwrócenie uwagi na pozytywne wyniki związane z wdrożeniem aktywności prośrodowiskowych w łańcuchu dostaw oraz wskazanie, czy uwarunkowania kontekstualne, w jakich działają przedsiębiorstwa, wpływają na poziom osiąganej wydajności prośrodowiskowej. Przedmiotem badań są polskie przedsiębiorstwa produkcyjne. Badania empiryczne przeprowadzono z wykorzystaniem autorskiego kwestionariusza ankiety. Między innymi dowiedziono, że wyższy poziom wyników prośrodowiskowych wypracowanych na rzecz interesariuszy wewnętrznych i zewnętrznych osiągają przedsiębiorstwa, które posiadają wyrównane siły przetargowe zarówno po stronie dostawców, jak i odbiorców, uczestniczą w międzynarodowych łańcuchach dostaw, posiadają zdywersyfikowany profil produkcji pod względem punktu rozdziału towarów, są przedsiębiorstwami dużymi oraz te, które w mniejszym stopniu dokonują outsourcingu zadań transportowych. Stwierdzono także, że niezależnie od przynależności do danej grupy klasyfikacyjnej zestaw najczęściej otrzymywanych wyników jest podobny.

EN

The aim of this research is to draw attention to the positive results connected with the implementation of environmental activities in supply chains and to determine if contextual conditions, in which companies operate, are influencing the level of the achieved environmental efficiency. The subjects of the research were the Polish production companies. The empirical research was conducted with the use of own survey questionnaire. Among others, it was proven that the higher level of environmental results for internal and external stakeholders achieve companies, which have balanced purchasing powers both on the side of suppliers and customers, participate in international supply chains and have diversified production profile in respect of decoupling points, these that are large enterprises and companies, which are outsourcing transport activities to a lesser extent. Also, it was concluded that regardless of the group, the sets of the most often achieved results are similar.