the present study was conducted to determine peak ground acceleration (pga) over bedrock in probabilistic analysis methods for the seismic hazard and uniform hazard spectra at different hazard levels for esfahan city. a series of statistics containing historical and instrumental seismic data covering from the 8th century a.d. to the now up to a radius of 200 km was employed and seismic sources ...

the percent of normal precipitation index (pnpi) is a widely used drought index to provide good estimations about the intensity, magnitude and spatial extent of droughts. the objective of this study was analyzing spatial pattern of drought by pnpi index. in this paper, according to the data of 40 stations in iran, during 1967-2009, the pattern of drought hazard is evaluated. influenced zone of ...

the identification of natural hazard prone areas for future planning requires an efficient decision support tool to provide the appropriate weights for the various topographical, geological, and seismological factors responsible for the expected hazards. in the present study, an analytical hierarchy process (ahp) with six earthquake hazard parameters (ehps) was used as a decision support system...

we define a new type of spectrum, called δ-approximate spectrum, of an element a in a complex unital banach algebra a and show that the δ-approximate spectrum σ_δ (a) of a is compact. the relation between the δ-approximate spectrum and the usual spectrum is investigated. also an analogue of the classical gleason-kahane-zelazko theorem is established: for each ε>0, there is δ>0 such that if ϕ is...

background and objective: prevention of accidents—a crucial requirement in oil industries—involves hazard recognition, risk assessment, and corrective actions. the purpose of this study was to compare the etba and hazop techniques for risk assessment in a gasoline refinery unit. methods: in this case study, data were collected using process flow diagram, walking–talking through method, piping a...

to resort to trickery to get repeat prescriptions, but it wasn't too difficult, and as I had no underworld contacts, I had to get my supply In due course my mental and physical health deteriorated and I was forced to tell my tale of woe to my doctor, who calmly scrawled another prescription for Duraphet instead. After four months in a mental hospital 1 was freed of my hell. That was two years a...

T. Bredfeldt Texas Commission on Environmental Quality, MC-168, P.O Box 13087, Austin, TX 78711-3087, USA e-mail: [email protected] Abstract Hazard identification is considered an early step in the risk assessment process. The primary goal of this step is to determine whether exposure to a chemical is likely to cause a specific adverse health effect in humans. The process of hazard ide...