fluorescence chemical sensors for the highly sensitive and selective determination of pb2+ , hg2+, co2+ and fe3+ ions in aqueous solutions are described. the ion sensing system was prepared by incorporating lipophilic ligand (l) as a neutral ion-selective fluoroionophore in the plasticized pvc membrane containing sodium tetraphenylborate or potasium tetrakis (p-chlorophenyl) borate as a liphoph...

the present study aimed to investigate the possible effects of focused highlighted error feedback on grammatical accuracy of writing among iranian intermediate efl learners. after selecting 52 homogenous participants from among 70 university students attending azad university of rasht and randomly dividing them into two intact groups of 26 students, the researcher exposed the participants of th...

Despite the empirical evidence of the difference in the degree of price stickiness of goods and services, in the new standard Keynesian models, the same price stickiness is considered for all firms producing intermediate goods. In recent years, a new generation of pricing models has been introduced to simulate the heterogeneous price setting behavior in which, unlike standard pricing models, th...

 Evaluation of intercity trips may be used for anticipation of trip demands, services’ pricing and improvement of the studies for contradiction determination. Usage of trip demand modeling processes, like what existed in the classic method for analyzing urban trip demand, would make the analysis of road trips possible. A substitute method for 4 Steps Models is to use Direct Demand Modeling whic...

  Evaluation of intercity trips may be used for anticipation of trip demands, services’ pricing and improvement of the studies for contradiction determination. Usage of trip demand modeling processes, like what existed in the classic method for analyzing urban trip demand, would make the analysis of road trips possible. A substitute method for 4 Steps Models is to use Direct Demand Modeling whi...

Abstract. One of the major problems in using wind energy is that wind-generated electricity is more unstable than electricity generated by other sources, and therefore integrating wind energy use with traditional power generation systems can be a challenge. This problem can be effectively reduced by having accurate information about the mean and wind speed volatilities. Therefore, in this paper...

this studyinvestigated therelations between examinees’ academic knowledge and theirperformanceonreading section of ielts and toefl (ibt) through using generalizabilitytheory. g-theory was utilized to investigate the effects of subtest, test items, participants and academic background on the reliability of ielts and toefl (ibt) score. tosamplethe subjectsofthissurvey,a placement testwasadministe...