Purpose: Alkyd resins constitute a very high proportion of conventional binders used in surface coatings. In order to enhance the quality of these alkyd resins methyl esters of rubber seed oil (MERSO) were used in the preparation of the resins. Methods: MERSO were obtained by in-situ alcoholysis of rubber seed. Alkyd resins having oil lengths of 45, 50 and 55% were prepared with MERSO, phthalic...

objectives: composite restorations must have tooth-like optical properties namely color and translucency and maintain them for a long time. this study aimed to compare the effect of accelerated artificial aging (aaa) on the translucency of three methacrylate-based composites (filtek z250, filtek z250xt and filtek z350xt) and one silorane-based composite resin (filtek p90). materials and methods...

ibn abi- jumhur ahsa’i, a prominent thinker of the shi’ite sage, who was alive until the early era of the safavid dynasty, can be called “the founder” because of his revolution in the form and method as well as in the theological attitude of shi'ite kalam, and since this revolution is fulfilled through illuminative wisdom, he has to be called “the founder of illuminative shi'ite kalam...

Abstract Within the broader contexts of language maintenance, revitalisation and use, schools have an important role to play in early transmission minority or minoritized languages. Through effective classroom-based practices, teachers can offer rich, continuous linguistic experiences for young people they teach that lead long-term, sustained engagement with over time. How a given approach prac...

Anion exchange resins are important tools for the removal of harmful anionic contaminants from drinking water, but their use has been linked to the presence of carcinogenic nitrosamines in treated drinking water. In bench-scale batch and column experiments, anion exchange resins from a large, representative group were investigated as sources of the nitrosamines N-nitrosodimethylamine (NDMA), N-...

UNLABELLED Hearing aid. AIM To compare the performance, benefit and satisfaction of users of ITE, CIC and BTE digital hearing aid with noise reduction and omnidirectional and directional microphones. METHOD 34 users of hearing aid were evaluated by means of speech perception in noise tests and APHAB and IOI self assessment questionnaires. Prospective study. RESULTS Better results were obt...

In this paper we present a new approach for the realization of a BDD-package. This approach does not depend on recursive synthesis operations (i.e. the ternary If-Then-Else-operator (ITE)) to perform manipulations of Boolean functions; instead our basic operation MORE is based on exchanges of neighbouring variables and existential quantiication. It is capable of combining an arbitrary number of...

Straw powders were blended with hydrolyzed soy protein isolate (HSPI) modified urea-formaldehyde (UF) resins to produce biodegradable seedling containers. The tensile strength and the degradability of the seedling containers were characterized. Moreover, the degradation behavior of modified UF resins was investigated using N isotopic tracing, dynamic mechanical analysis, C CP/MAS NMR spectrosco...

Ion exchange resins are used in several chemical decontamination or cleaning processes and in nuclear industries for removal of radionuclides.1–5 Nowadays, ion exchange resins are not only used for separation but also as catalysts. In the past decade, inorganic ion exchange materials have emerged as an increasingly important replacement or complement to conventional organic ion exchange resins....

Uptake of alkane (C5-C9) and alcohol (C4-C7) solutes by both strong acid cation exchange resins and strong base anion exchange resins in aqueous medium has been studied. The amount of solute taken up by resins is directly proportional to the solute concentration equilibrium with resins. Hydrophobic interaction between the solute and the resin matrix appears to play an important role in the upta...