polyethylene is a synthetic polymer which is used in our daily life for different purposes. increased use of polyethylene causes severe environmental problems. there are different methods to decrease problem caused by polyethylene for example source reduction, incineration and land filling and all of them have their own drawbacks. so, the best way to reduce the problem caused by polyethylene is...

Belt conveyors are used for the transportation of bulk materials in a number different branches industry, especially mining and power industries or shipping ports. The main component belt conveyor is its belt, which serves both as support transported material along route an element drive transmission system. Being crucial to effective reliable operation conveyor, also most expensive least durab...

Due to the fact, that microplastics are a global environmental problem, new ways for their removal from water, soil and air need be developed. New materials in combination with easy implement technologies microplastic come into focus of scientific studies engineering, especially application water resources. In our comparative case study, effects composition temperature on agglomeration-fixation...

Microplastics (MPs) pollution is arousing growing attention, yet knowledge about its occurrence in amphibians scant to date. With this study, we aimed determine whether plastic (>5000 ?m) and MPs (10–5000 could be detected adult Rana temporaria from a high-mountain ecosystem (the Cottian Alps, northwest Italy). To do this, aquatic compartments the digestive tract of R. were analyzed. Water, ...

In order to determine whether there is an orientation preference of pyrrole-imidazole (Py-Im) polyamide dimers with respect to the 5′-3′ direction of the backbone in the DNA helix, equilibrium association constants (Ka) were determined for a series of six-ring hairpin polyamides which differ with respect to substitution at the N and C termini. Affinity cleaving experiments using hairpin polyami...

in this research, high oxygen-barrier films were organized based on low-density polyethylene (ldpe)/ ethylene vinyl alcohol (evoh)/ polyethylene-grafted maleic anhydride (ldpe-g-ma) compatibilizer. the effects of 10–30 wt. % evoh and 0–10 wt. % ldpe-g-ma loadings on the properties of final films were evaluated. the morphology of specimens was observed by using scanning electron microscopy (sem)...

‎We call a ring $R$ right generalized semiperfect if every simple right $R$-module is an epimorphic image of a flat right $R$-module with small kernel‎, ‎that is‎, ‎every simple right $R$-module has a flat $B$-cover‎. ‎We give some properties of such rings along with examples‎. ‎We introduce flat strong covers as flat covers which are also flat $B$-covers and give characterizations of $A$-perfe...