background: the hygienic issues are the essential criteria in the primary site selection, compatibility and maintain of passengers health after use of the services. qom with 17 million annual tourists is the second religious tourism center in iran. the aim of this study was to investigate the impact of the public residential centers internal managers’ educational status on their environmental h...

in this paper, absorbing markov chain models are developed to determine the optimum process mean levels for both a single-stage and a serial two-stage production system in which items are inspected for conformity with their specification limits. when the value of the quality characteristic of an item falls below a lower limit, the item is scrapped. if it falls above an upper limit, the item is ...

this paper studies the generalized version of thezakharov-kuznetsov benjamin-bona-mahoney equation. the functionalvariable method as well as the simplest equation method areapplied to obtain solitons and singular periodic solutions to theequation. there are several constraint conditions that arenaturally revealed in order for these specialized type ofsolutions to exist. the results of this pape...

In this paper we focus on a continuously deteriorating two units series equipment which its failure can not be measured by cost criterion. For these types of systems avoiding failure during the actual operation of the system is extremely important. In this paper we determine inspection periods and maintenance policy in such a way that failure probability is limited to a pre-specified value and ...

agriculture as one of the major economic sectors of iran, has an important role in gross domestic production by providing about 14% of gdp. this study attempts to forecast the value of the agriculture gdp using periodic autoregressive model (par), as the new seasonal time series techniques. to address this aim, the quarterly data were collected from march 1988 to july 1989. the collected data w...

This paper reports a new class of periodic banding Fe(OH) 3 precipitate through reaction–diffusion–reaction (RDR) processes in agarose gel sandwiched between two metal rods (Ti and Fe) with cyclic alternating voltages. In the RDR processes, electrochemical reactions at to generate reactant ions, diffusion ions influenced by electric field gel, form precipitates were coupled bands cathode side. ...

Abstract Based on the principle of electromagnetic eddy current testing, aiming at problems heavy workload and difficult location defects in periodic inspection buried pipelines, distribution probes, is modeled simulated by using ANSYS EM simulation software, correlation model between pipeline parameters, excitation signals, received signals established, quantitative relationship wall thickness...

NOx pollution is one of the greatest air quality issues that urban areas face today, particularly within European Union (EU), yet currently this pollutant only controlled through homologation process. There no periodic technical inspection (PTI) process for emissions EU, leaving a weakness in legislation allowing high polluters to negatively impact quality. Work needs be performed incorporate s...

The power grid is an essential infrastructure in any country, comprising thousands of kilometers lines that require periodic inspection and maintenance, carried out nowadays by human operators risky conditions. To increase safety reduce time cost with respect to conventional solutions involving manned helicopters heavy vehicles, the AERIAL-CORE project proposes development aerial robots capable...