abstract efficiency concept has a long history in the sciences and its measurement and analysis is a vital importance for firms to achieve the best performance. hence, the aim of this paper is efficiency evaluation of mahan air compared to iata member airlines in middle east and africa. for this purpose, the indicators include available ton kilometer, revenue ton kilometer, revenue passenger ki...

We present a novel photoacoustic detection system with a high pressure C02 laser as radiation source. The laser is continuously tunable across wavelength ranges from 13 cm-I to 18 cm-1 wide. The narrow bandwidth of 0.017 cm-1 allows to resolve any fine structure in the absorption spectra of trace gases at atmospheric pressure. The absorption spectra of four gases are reported, demonstrating the...

Fine particle suspensions of various materials in water were agglomerated with heptane in a modified blender to determine the agglomeration characteristics of the solids. The materials included Upper Freeport coal, oxidized Upper Freeport coal, two batches of Illinois No. 6 coal, graphite, and iron pyrite. The response of these materials to oil agglomeration varied over a wide range and seemed ...

The design of a lightweight oxygen rebreather'set suitable for short durati~n.exp~orations in foul-air caves is described, together with a discussion of its performance, l~m~tat~ons, and possible improvement. Excessive concentrations of carbon dioxide (C0 2) are not a common feature of British caves, and their occurrence is usually limited to a few unusual situations such as sump airbells and c...

Eco-architecture is a sustainable concept which in essence prioritizes natural and environmental aspects an architectural design. In addition, eco-architecture also focuses on the use of energy as alternative source to replace fossil produces C02 causes damage ecosystems harm living things it. this research, Marina Bay Sands Hotel object hotel research that uses its There discussion building's ...

In the past decade, corporate firms have globally increasingly adopted social responsibility (CSR) practices; however, so far less is known about how productivity change in presence of socially responsible and undesirable output can be evaluated. This paper develops a framework that integrates CSR dynamic by-production technology which captures transformation multiple inputs into marketed outpu...

Authors’ Note: This work has been partially funded by the Spanish National Projects FLeXO (TSI-0203012008-19, www.ines.org.es/flexo) and aDaPTaLeaRN (TIN2007-68125-C02-01) and by european Projects eU4aLL (IST-2006-034778, www.eu4all-project.eu) and alfa-CID (ww.aproa.cl/cid-alfa/, II-0511-a). The Complutense University of Madrid has also supported this work (research group 921340). We also than...