Some specially designed materials exhibit a transverse expansion when stretched. This behaviour can be described by a negative Poisson’s ratio, υ, that is commonly defined as the ratio between the negative transverse strain and the longitudinal strain. Some polymers found by Lake [1] have such property. In a separate paper, Lake showed a 2d version of the micro-structure of the materials consis...

Curved tubes of non-circular cross section are widely used in various fields technology. The change the planned operating modes technological processes is associated with wear executing mechanisms, which caused by unstable frequencies and amplitudes oscillations. Thus, issue determining oscillation parameters these elements becomes more significant. technique results tests for stresses, displac...

in order to evaluate the effectiveness of the iranian made charcoal tubes in the field , 60 local made and 60 imported ones (skc type) were randomly selected and placed side by side for sampling aromatic hydrocarbons (including benzene, toluene, xylene) in workers breathing zone in a paint factory. the results indicated that there were no statistically significant differences between the mean c...

ultraviolet waves, because of their short wavelength, have a high energy and considerable damaging effects on surfaces. protection against ultraviolet radiations is one of the finishing treatments done on surfaces exposed to sunlight. the importance of this issue in relation to human health, due to complications such as skin burns and cancer, is doubled. up to now, different materials such as z...

The objective of the study is to explore and find out ethnomathematics Gedongsongo Temple, located in Central Java, Indoensia. type qualitative with an exploration way ethnographic approach. data obtained form data, source research through observation, interviews, documentation, literature related Temple. collection technique was done by questioning, observing, interviewing, documenting. result...