Controlling the microbiological quality of water is important for its uses. Microbiological requirements of drinking water ensure the absence of coliforms, but may indicate the potential presence of other potentially pathogenic microorganisms and viruses of fecal origin. A total of 36 water samples, representing the drinking water of the whole city of Aradan, Semnan, Iran, were randomly collect...

In this study, by integrating preventive maintenance (PM) into a two-dimensional warranty region, with customized PM (2D PM) is proposed from the manufacturer’s perspective to reduce cost. The cost of 2D derived. tradeoff between and minimal repair saving obtained choosing proper reliability threshold number PMs, advantage illustrated. Second, post-warranty period, bivariate (BPWM) policy consu...

With the help of advanced digital technologies, product managers can use monitored mission cycles to sustain reliability. In this study, a random warranty model and replacement next (RRN) are designed through-life reliability with cycles. The warranty, called two-stage two-dimensional free repair (2DFRW), be carried out during stage. ‘whichever occurs first last’ is used distinguish coverage ra...

employing remanufactured and refurbished products are among the new strategies that companies used to raise their profits as well as protects environment. although used product equipment gives an opportunity to purchase latest technology, customers are doubtful about quality and reliability of these products. because of limitation that developing countries faces in buying new products, some cou...

warranty as a kind of service contract today plays a role key in business and legal transactions. in this paper, we present a manufacturer, an agent and a customer's model under different service contracts suggestions. the manufacturer's profit is maximized by determining sale price, warranty period and warranty price. in addition we obtain optimal maintenance cost or repair cost for ...

In this study we propose an approach of quantifying the risks of misinforming and malfunctioning aiming to assess the quality of a warranty policy. We identify the “quality” of a warranty policy as an integral measure, based on the balance between two types of warranty – the warranty of malfunctioning and warranty of misinforming. This measure is represented in terms of the length of the warran...

This study aims to understand the form of social action in kinship migrant informal sector vendors and values that underlie formation warranty. The research paradigm used this is definition paradigm, using a qualitative approach an ethnographic type research. technique determining subjects purposive sampling data collection techniques interview observation techniques. Data analysis interactive ...

We consider the problem of outsourcing warranty repairs to outside vendors when items have priorities in service. The manufacturer has a contract with a fixed number of repair vendors. The manufacturer pays a fixed fee for each repair done by a vendor which is independent of the repair type and priority class but depends on the vendor. There are a fixed number of items under warranty, and each ...

this paper develops a model for distribution network expansion planning (dnep) considering reliability issues. with simultaneous switch placement and dnep, the proposed model tries to adequately consider the reliability issues in the planning stage in a way that the designed network has suitable performance from the reliability viewpoint. the reinforcement or installation of mv feeders and hv/m...