in this paper we study two important concepts, i.e. the direct andthe inverse limit of hyperstructures associated with fuzzy sets of type 2, andshow that the direct and the inverse limit of hyperstructures associated withfuzzy sets of type 2 are also hyperstructures associated with fuzzy sets of type 2.

this paper considers the problem of stable limit cycles generating in a class of uncertain nonlinear systems which leads to stable oscillations in the system’s output.this is a wanted behavior in many practical engineering problems. for this purpose, first the equation of the desirable limit cycle is achieved according to shape, amplitude and frequency of the required output oscillations. then,...

a label-free electrochemical nucleic acid aptasensor for the detection of methamphetamine (ma) by the immobilization of thiolated self-assembled dna sequences on a gold nanoparticles-chitosan modified electrode is constructed. when ma was complexed specifically to the aptamer, the configuration of the nucleic acid aptamer switched to a locked structure and the interface of the biosensor changed...

The shrinkage limit is one of the Atterberg limits and a fundamental geotechnical parameter used to assess settlement other volume change parameters engineering soils containing clays. This paper describes index tests results on expansive soil treated with rice husk ash (RHA) 5%, 10% 15% quicklime activated (QARHA) obtained using laboratory testing procedure. representative was subjected classi...

Dredged sediments from ports and rivers are treated as waste material. The disposal of has environmental concerns requires financial resources. reuse in building material such adobe bricks can provide an alternate solution to valorize handle this Adobe eco-friendly construction materials manufactured with clayey soil fibers. Natural fibers addition improves mechanical thermal characteristics br...

Use of soft clay soils in construction activities has faced many problems. Some improvement, stabilization, and reinforcement methods is required to use these soils in body of roads, sub-foundations and embankments. In this research, the effect of chitin nanofiber and rice husk ash as additives on the behavioral properties and bearing resistance of soft clay soils by considering the processing ...

The present research was conducted to assess the effects of vermicompost (VC) treatments under different soil moisture contents on consistency limits sandy-clay-loam (SCL) soils in which lettuce (Lactuca sativa var. crispa) cultivated a greenhouse. Liquid limit (LL), plastic (PL), plasticity index (PI), (Ic) and clay activity (A) values were investigated. Three VC doses (0, 2.5 5% w/w) applied ...

in this research, air sampling of workplaces was carried out by two methods (long - time and short - time). the mean formaldehyde concentration with long - time method in pathology labs, surgery and endoscopy sections were 0.96 0.25 and 0.13 ppm and with short - time method, 8 hours, was 3, 0.3 and 0.2 ppm. the mean formaldehyde concentration in pathology labs was above the standard values (tlv...