Background: In this study, the health risk associated with three types of drinking waters (fissure, underground treated and surrounding waters) from two mines in South Africa were assessed. Materials and Methods: The measurement of the radionuclides concentration was carried out by liquid scintillation counter and alpha spectrometer. The estimated radiological risk pose to the people consuming ...

depending on the moisture contents, the soil behavior is revealed as solid, semisolid, plastic and liquid states. liquid limit is an important property of fine-grained soils and casagrande and cone penetrometer are two different methods employed for the determination of liquid limit of the soil. in forest environment, the casagrande method is the classic method for liquid limit determination, b...

Some attention has been paid to defining all the terms used, even some commonplace terms which either have or need to be assigned a technical meaning, to eliminate ambiguity. The definition of a term may usually be found in proximity to its first use, after that use (that is, the presentation style is “lazy” rather than “greedy”). Commonplace words used with commonplace meanings are left undefi...

introduction: patient safety improvement requires ongoing culture. this cultural change is the most important challenge that managers are faced with in creation of a safe system. this study aims to show the results of initiatives to improvement in patient safety culture in fateme al-zahra hospital. method: in the quasi-experimental research, patient safety culture was measured using the persian...

Certifying agencies have begun to require a safety case as part of the product certification process. The standards upon which such certification regimes are built define properties that the safety case must have, e.g., “compelling,” and “valid”, yet leave these terms undefined. Unaided judgment of these properties leaves doubt about how approval will proceed. We introduce an operational defini...

The objective of this paper is to present a framework developed for assisting railway operators into monitoring and controlling the quality of services provided to their passengers. This framework is based on the estimation of 22 indicators, grouped under six criteria, i.e. itinerary accuracy, system safety, cleanness, passenger comfort, servicing, and passenger information. The valuation of th...

Cellular Automata is a discrete model studied in computability theory, mathematics, physics, complexity science, theoretical biology and microstructure modeling. This paper proposes a model to balance the flux and safety, to maximize the flux on each road whilst ensuring work well with safety based on the Cellular Automata. In order to analyze the flow of traffic, the traffic of threelane freew...

Safety critical systems often have shutdown mechanisms to bring the system to a safe state in the event of a malfunction. We examine the use of ride-through, a technique to reduce the frequency of safety shutdowns by allowing small transient violations of safety rules. An illustrative example of enforcing a speed limit for an autonomous vehicle shows that using a rate-limited ride-through bound...