the paper presents the results of an investigation on the acoustic performance of vertical profile parallel barriers with quadratic residue diffuser tops and faces. a 2d boundary element method (bem) is used to predict the barrier insertion loss. the results of rigid and with absorptive coverage are also calculated for comparisons. using qrd on the top surface and faces of all vertical profile ...

Objective: The excessive self-esteem of managers leads to postponing bad news due to weaknesses in performance, and conservatism can be a factor in modifying it. In this paper, the purpose is to examine the role of accounting conservatism in limiting the functional outcomes results from overconfidence managers. Methods: The data of the companies listed in the Tehran Stock Exchange for the peri...

background and objectives: hospitals usually generate large amounts of hazardous waste. if not managed properly, hospital waste can pose threats to public safety and damage the environment. waste minimization is a waste management approach that focuses on reducing the amount and toxicity of hazardous wastes. this study pursues a two-fold purpose: 1) to gain insight into hospital waste minimizat...

In this study, the thermal performance of three kinds of roofs with different heat capacity and thermal conductivity under different external conditions has been investigated using a numerical method. For this purpose, the combined solar radiation, conduction and convection heat transfer were calculated implicitly in terms of a one-dimensional finite difference method. Different high and low so...

To improve the potential of single chamber microbial fuel cells (SCMFCs) as an applicable technology, main challenge is a practical application for larger scales bioenergy production from potent exoelectrogenic microorganism with real dairy wastewater. increase power generation, three individual MFCs were together operated in series best under fed batch condition 15 days. The volume MFC 1 and 2...