In this work thermal runaway of cumene hydroperoxide (CHP) in a storage tank with constant jacket temperature is considered. The divergence method developed by Strozzi and Zaldivar (1994) based on the concept of parametric sensitivity and a runaway criterion focused on a set of critical parameters identified by Velo et al. (1996) have been applied to our system. The results obtained from the co...

The progressive reduction of velocitygradient to keep the flocculation rate as high as possible without breakage of flocsis called 'tapered flocculation'. In the present work, an attempt has been made to compare the performance of continuous tapered flocculationin conicaland cylindricaltanks. The efficiencyof conical flocculator was found to be higher than that of cylindrical flocculator, espec...

Urban rainwater reuse preserves water resources and promotes sustainable development in rapidly growing urban areas. The efficiency of a large number of urban water reuse systems, operating under different climate and demand conditions, is evaluated here on the base of a new risk analysis approach. Results obtained by probability analysis (PA) indicate that maximum efficiency in low demanding s...

This paper reviews the design of rainwater harvesting systems used for potable water supply in Thailand, its implementation, socio-economic aspects, operation and maintenance, water quality aspects and current practice. Rainwater harvesting has become popular in rural areas of Thailand because of population growth, inaccessibility, contamination and unreliability or unavailability of central wa...

BACKGROUND & OBJECTIVES Changes in weather patterns especially rainfall affects the distribution and densities of mosquitoes. The objective of this study was to describe mosquito aquatic habitats, to determine larval abundance, species composition, and habitat types found in Kasayani village of Kibwezi division. METHODS A cross-sectional survey of mosquito larval habitats was conducted in Kas...

Organic phase change material (PCM) with macro-encapsulation is attractive in energy storage applications as it has relatively low cost. This study focuses on using PET plastic pipes to encapsulate paraffin and using low-cost float stones to increase the thermal conductivity of PCM modules as they have a special structure of high porosity. Float stones were immersed in the liquid PCM and an ult...

This paper examines whether risk-based pricing promotes risk-reducing effort. Such mechanisms are common in private insurance markets, but are rarely incorporated in government assurance programs. We analyze accidental underground fuel tank leaks—a source of environmental damage to water supplies—over a fourteen-year period, using disaggregate (facility-level) data and policy variation in finan...

The seismic behaviour of underground structures is generally satisfactory compared to the above-ground ones. However, despite of the buried structure confinement, in recent strong seismic events some underground structure as tunnels, pipelines and tanks suffered high damage; for this reason, a strong effort is focused to evaluate the seismic vulnerability of these structure and to give codes in...