High energy density advanced manufacturing processes, such as power beam welding and additive manufacturing, are notoriously difficult to simulate. Such processes initiate fusion, vapourisation, state transitions in their respective (normally metallic) substrates generating complex metallic flows over incredibly short time scales. To mathematically model equations describing the conservation of...

Abstract A major obstacle to the gas-phase study of larger (bio)molecular systems is vaporisation step, that is, introduction intact sample molecules into gas-phase. promising approach use laser-induced acoustic desorption (LIAD) sources, which have been demonstrated using both nanosecond pulsed and continuous lasers. We directly compare here approaches for first time under otherwise identical ...

background : labor pain relief has been considered since many years ago. heat as a non pharmacological method of pain relief helps reducing the pain intensity and increases the pain consistency. the aim of the study was to determine the effect of the heat therapy on the labor pain in primigravida women. methods : in this clinical trial study, 64 low risk nulliparous women were randomly divided ...

the urban heat island effect refers to the temperature rise of the cities in comparison to the suburbs. this phenomenon which is a consequence of urbanization and has become a major issue in the urban climatology may have serious consequences in the developing countries which are facing a rapid and unplanned urban growth. tehran, the capital and the most populated city of iran, this phenomenon ...

heat stress is a common occupational health hazard at outdoor workplaces especially in a hot-humid climate. overheating of the body can cause a number of problems, including heat rash, heat cramps, dizziness, heat exhaustion, and heat stroke. the present study aimed to assess heat stress indices including di, wbgt, and sw req /phs, as a mean to estimate the heat load on the employees of a petro...

In this study, by using the finite volume method, the heat transfer in a convective straight fin with temperature-dependent thermal properties and an internal heat generation under multi-boiling heat transfer modes are analyzed. In this regard, the local heat transfer coefficient is considered to vary within a power-law function of temperature. In the present study, the coexistence of all the b...

In this paper the heat transfer characteristics of a two-phase closed thermosyphon over a wide range of heat transfer rates, system pressure, aspect ratios and filling ratios were studied. The experiments focused on the boiling and condensation heat transfer characteristics of a thermosyphon with a copper tube having 25 and 32 mm inside and outside diameters. Distilled water was used as the wor...

the aim of this study was to determine the frequency of enterotoxigenic and enteroaggregative strains ofescherichia coli in chicken carcasses by polymerase chain reaction (pcr). in this study 63 strains of e. coliwere isolated from 110 samples of chicken carcasses during processing after chilling in the poultry slaughterhouse of shahrekord. polymerase chain reaction assays were used to detect t...