Comparative Study on Selected Properties of Modified Polyurethane Foam with Fly Ash.

The aim of the article is to compare two types of fly ash (from the fluidized and pulverized coal combustion process) as a filler for rigid polyurethane foam. Pulverized fly ash (PFA) is widely used in building materials, while fluidized fly ash (FFA) is not currently recycled, but landfilled. The produced rigid polyurethane foams were reinforced with 5 and 10% by weight addition of fly ash from two different types of boilers.

Effect of Strain on Heating Characteristics of Silicone/CNT Composites.

In this work, silicone/carbon nanotube (CNT) composites were produced using a spread coating process, followed by morphological investigations and determination of their electrical properties and heating behaviour through the application of electric potential. Composites containing varying amounts of CNT (1-7%) were investigated for their thermal behaviour with the use of an IR camera. Subsequently, thermal behaviour and electrical properties were measured when the samples were stretched (up to 20%).

Enhanced Functional Properties of Low-Density Polyethylene Nanocomposites Containing Hybrid Fillers of Multi-Walled Carbon Nanotubes and Nano Carbon Black.

In this work, hybrid filler systems consisting of multi-walled carbon nanotubes (MWCNTs) and nano carbon black (nCB) were incorporated by melt mixing in low-density polyethylene (LDPE). To hybrid systems a mixture of MWCNTs and nCB a mass ratio of 1:1 and 3:1 were used. The purpose was to study if the synergistic effects can be achieved on tensile strength and electrical and thermal conductivity.

Functional Properties of Poly(Trimethylene Terephthalate)-Block-Poly(Caprolactone) Based Nanocomposites Containing Graphene Oxide (GO) and Reduced Graphene Oxide (rGO).

This work reports a study on the influence of graphene oxide (GO) and reduced graphene oxide (rGO) on the functional properties of poly(trimethylene terephthalate)-block-poly(caprolactone) (PTT--PCL-T) (75/25 wt.%/wt.%) copolymer, obtained from dimethyl terephthalate (DMT), 1,3-biopropanediol and polycaprolactone diol (PCL) via in situ polymerization.

Surgery or implantable hearing devices in children with congenital aural atresia: 25 years of our experience.

Objectives: Congenital aural atresia and ear deformities have been the subject of serious discussions for centuries. These malformations are associated with significant aesthetic and functional problems. Outcome of the surgical solution is rarely optimal.

Malformations of the first branchial cleft: duplication of the external auditory canal.

Objective: Malformations of the first branchial cleft are uncommon and only sporadic reported in the literature. The may be present as a swelling or inflammatory opening on the neck, blind cysts or fistula associated with the external auditory canal. In this retrospective study, clinical features, diagnostic and therapeutic pitfalls are described in nine pediatric cases.

[Morphology and diagnosis of the oral protozoans Trichomonas tenax and Entamoeba gingivalis using the Giemsa-Romanovsky stain].

In the microscopic diagnosis of Trichomonas tenax and Entamoeba gingivalis is the technically and time not demanding native preparation of a culture, in which both protozoans can be detected according to their typical motility, determining. In the permanent preparation of the culture stained according to Giemsa-Romanovsky, which has also documentary character, are all of the characteristic cell organelles stainable, enabling so their detection without their typical motility. Staining according to Giemsa-Romanovsky is technically simple and not time consuming, not very laborious, low cost and the coloration is permanent, that means optimal for the diagnostic of oral protozoans in permanent preparations.

[The role of Toxoplasma gondii in the etiology of chronic tonsillitis in children].

Toxoplasma gondii is known to have an affinity to lymphatic tissue. A series of 506 children with chronic tonsillitis were examined serologically for toxoplasmosis by means of CBR, IIR and ELISA. In 7.

[The role of Toxoplasma gondii in the etiology of chronic tonsillitis in children].

Toxoplasma gondii is know to have an affinity to lymphatic tissue. The authors studied whether after infection of the child's body T. gondii does or does not determine the chronic course of tonsillitis.