double system of exponents with complex-valued coefficients is considered. under some conditions on the coefficients, we prove that if this system forms a basis for the morrey-lebesgue type space on $left[-pi , pi right]$, then it is isomorphic to the classical system of exponents in this space.

Background & Aims of the Study: Welder’s exposure to welding fumes can cause occupational diseases. The current study sought to examine exposure to welding fumes among welders who work in the repair shop of Sarcheshmeh Copper Complex and design a local exhaust ventilation system to control exposure to welding fumes. Materials & Methods: This applied analytical study was co...

In this paper, the dynamics of multicellular chopper are considered. The model is described by a continuous time three--dimensional autonomous system. Some basic dynamical properties such as Poincar'e mapping, power spectrum and chaotic behaviors are studied. Analysis results show that this system has complex dynamics with some interesting characteristics.

using uv-vis spectrophotometric method, the formation constant for interaction of fe2+(aq) ion with l-alaninewas experimentally studied at ph = 4.1 ± 0.01 (50mm of potassium hydrogen phthalate buffer), ionic strengthof 0.1m potassium nitrate and at 5 different temperatures 15,20, 25,30 and 35 t. the optical absorption spectraof mixtures containing considered cation and l-alanine were analyzed b...

work system safety is a function of many factors, besides its dynamic and complex structure. there may be relations and dependencies among the safety factors. therefore, work system safety should be analyzed in a holistic manner. in this study, the faulty behavior risk (fbr) which is significant in work system safety is tried to be determined through analytical network process (anp) which is an...

1. Summary A collective is a group of self-motivated agents that maximize system performance through the pursuit of local objectives. This paper deals with two aspects of collective design: the application of optimization in the design of collectives, and the use of collectives for engineering design itself, in which multiple individuals or teams design parts of a large-scale system. Examples a...