Comparative thermodynamic, environmental and sustainability performance assessments of an aero turboprop engine utilizing jet fuel and biofuel

Author(s):  
Ozgur Balli ◽  
Alper Dalkiran
2020 ◽  
Vol 12 (24) ◽  
pp. 10228
Author(s):  
Esmee M. Veenstra ◽  
Naomi Ellemers

Offering environmental, social, and governance (ESG) assessment and certification can invite organizations to adapt their activities to accommodate environmental, social, and governance concerns. Prior research points to shortcomings in accurately monitoring and assessing organizational sustainability performance. This contribution aims to highlight the role of ESG indicators as motivating organizations to prioritize sustainability goals. Theory and research elucidate that the definition of specific goals guides the degree of effort organizations invest, the priorities they set, and the persistence they display in pursuing targeted outcomes. The extent to which performance assessments of rating agencies specify and integrate ESG concerns thus impacts the likelihood that organizations will address each of these sustainability targets. The likely impact of ESG indicators was examined by consulting ratings, rankings, and indexes from 130 rating agencies included in the Reporting Exchange Platform. We identified and categorized 237 unique indicators in over 600 corporate ESG indicators. Results reveal that themes covered are less well specified in the governance domain than in the environmental and social domain. Further, different dimensions are emphasized depending on which stakeholder is addressed (investors, consumers, companies). Taken together, we conclude that this makes it more difficult for organizations to adopt a holistic approach to the achievement of sustainability goals.


1997 ◽  
Author(s):  
Dean A. Colton ◽  
Xiaohong Gao ◽  
Deborah J. Harris ◽  
Michael J. Kolen ◽  
Dara Martinovich-Barhite ◽  
...  

2021 ◽  
Author(s):  
Stephen P. Lucas ◽  
Radi A. Alsulami ◽  
Bret C. Windom

Author(s):  
M. S. ASSAD ◽  
◽  
O. G. PENYAZKOV ◽  
I. I. CHERNUHO ◽  
K. ALHUSSAN ◽  
...  

This work is devoted to the study of the dynamics of combustion wave propagation in oxygen-enriched mixtures of n-heptane with air and jet fuel "Jet A-1" in a small-size pulsed detonation combustor (PDC) with a diameter of 20 mm and a length less than 1 m. Experiments are carried out after the PDC reaches a stationary thermal regime when changing the equivalence ratio (ϕ = 0.73-1.89) and the oxygen-to-air ratio ([O2/air] = 0.15-0.60). The velocity of the combustion wave is determined by measuring the propagation time of the flame front between adjacent pressure sensors that form measurement segements along the PDC.


1984 ◽  
Author(s):  
W. J. Purvis ◽  
R. J. Meehan
Keyword(s):  

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