The olefins polymerization process in a slurry reactor is discussed. The reaction rate dynamics was analyzed and the contributions of feed flow, gas-liquid mass transfer, polymerization reaction, and catalyst deactivation were estimated. The propylene solubility in a solvent mixture “heptane” was calculated using Soave-Redlich-Kwong equation of state. These data were then approximated by Henry-...

the ataxia telangiectasia mutated gene (atm), candidate for breast cancer susceptibility gene, encode a 350-kda protein belongs to the core components of dna-damage response machinery. female at carriers have at least 5-fold increase risk for breast cancer. reduction in atm expression is shown in multiple studies in breast tissues. we aimed to perform a research to measure the atm mrna expressi...

backgoround: plant diseases, caused by a wide range of phytopathogenic fungi, could be managed using of trichoderma sp, as a biocontrol agent. cell wall degrading enzymes like chitinase from t. harzianum are important means for fungal pathogen inhibition. overexpression of these chitinase enzymes can improve the antagonistic potential of trichoderma sp. strains. objectives: this study aimed to ...

Article history: Received 28 January 2008 Available online xxxx JEL classification: C91 D03 D90 In this paper we elicit preferences for money–time pairs via experimental techniques. We estimate a general specification of discounting that nests exponential and hyperbolic discounting, as well as various forms of present bias, including quasi-hyperbolic discounting. We find that discount rates are...

several authors have indicated that pcp is a toxic chemical and recalcitrant to biodegradation. aops is one of the moste effective process for degradation of persistant compound.since the mineralization of recalcitrant compound by aops (advanced oxidation processes) often requires long reaction time and strong doses of oxidant, the combination of this process with biological one, considered as ...

JAVA applets are not accurate enough to measure reaction time unless precautions are taken. A response-filtering technique is introduced that identifies inaccurate measurements by testing whether the client-side JAVA implementation produces false measurements of a time interval of known length during the measured reaction time. Reaction times that indicate such inaccuracy are discarded to incre...

Performing online behavioral research is gaining increased popularity among researchers in psychological and cognitive science. However, the currently available methods for conducting online reaction time experiments are often complicated and typically require advanced technical skills. In this article, we introduce the Qualtrics Reaction Time Engine (QRTEngine), an open-source JavaScript engin...

cupper oxide structures with a variety of novel morphologies are synthesized using cupper foil as substrate via a solution route. the structure, morphology and phase of the as-synthesized nanostructures are analyzed by various techniques. sem images show gradual development of hierarchical structures of copper oxide with different morphology. in order to study the effect of reaction time and te...

The processing of the German plural has been examined in a range of behavioral and neurophysiological studies. A number of studies so far showed differences between the processing of the default plural form -s and the irregular plural form -(e)n. While previous studies focused on the examination of generally two plural categories (e.g. -(e)n versus -s), the current study aimed at examining four...