This study investigated the perceptions of 211 English teachers about the use of various reading strategies and the possible factors that may limit the applications of those strategies in grades 69 in UAE's cycle 2 schools. The study also examined if there is any statistically significant difference between English nonnative and native teachers' views of the use of reading strategies and the factors that may hinder the use of such strategies in their classes. Generally, the results reveal that the English teachers tend to use various reading strategies in their classes (M =4.08) although they highlighted some factors that may limit the applications of those strategies (M=3.94). The results also show that there are some statistically significant differences between native and nonnative English teachers regarding the use of reading strategies in their classes and the factors that may limit the applications of such strategies.
In the past few decades Arab educators and literates have shown concern claiming that Arabs have abandoned reading. Another level of perplexity is added when the reading is proposed to take place in a second language? English. Studies indicate that in order for students to learn to read they have to do just that? read. Much research has shown that Extensive Reading is beneficial for second language learning. As such, this study sought to answer the question of how best to incorporate extensive reading programs in English classrooms in the UAE by examining it from a needs assessment perspective of the learners' themselves?an indispensable first step in implementing and planning educational programs. Questionnaires were used as the core mode of data collection from female and male public high school students in the UAE. Data gathered from the participants were analyzed following patterns of Borich's (1980) needs assessment model.
Amine foaming is a common problem in gas sweetening unit. Prediction of foaming behavior will help in unraveling the operational challenges faced by the gas industry. This study was carried out with the aim of predicting the foam height and surface tension of lean MDEA solutions using continuous foam fractionation technique. The effect of Bis (2Hydroxyethyl) Cocoalkylamine (BHCL, a corrosion inhibitor) as a model foam creators on foaming tendency was explored. The obtained experimental results were used to determine the empirical parameters k and n of the power law relation previously derived for high viscous fluid (i.e. ?2=K?1^n). The prediction model gave a perfect agreement with the experimentally observed results (<6?viation). The foam height model helped in envisaging the surface tension profile and in turn the separation performance of foam creators. The foam height was observed to increase with increasing the superficial gas velocity and BHCL concentration.
In this work, we show the unique wettability properties of deposited by ebeam evaporation on glass treated at 500 ?C. The deposited materials exhibited compact nonporous structures and their nonUV activated superwetting behavior was characterized, emphasizing the better performance compared to the bare glass substrate to a commercial selfcleaning glass (Pilkington Activ?) even in terms of antifogging optical properties. The results demonstrate how the superhydrophilic character arises from the used deposition technique inducing a large amount of oxygen vacancies further boosted by the annealing treatment, allowing the fabrication of a pioneering material in the area of multifunctional coatings. The photocatalytic activity of the film was also assessed by degradation of methanol, 2propanol and toluene under UV light in a gas phase reactor and the performance was found to be in most cases superior compared to Pilkington Activ?.
The feasibility of capturing carbon dioxide using activated carbons produced from seeds of local date fruits in the United Arab Emirates is explored in this experimental study. There has been no published study on the potentials of date seeds synthesized activated carbon for carbon dioxide capture. Adsorption efficiency often relies on method of preparation and starting or source materials. The physical activation methods are reported, with evaluation of effects of temperature on the yield and adsorption capacities of prepared activated carbon. Sample characteristics such as surface area and porosity, and scanning electron microscopic pore images are also reported in this study. Optimal temperature for pyrolysis was 800?C, while activation temperature which had the highest CO2 adsorption capacity was 900?C with a loading of 141.14 mg adsorbed CO2/g activated carbon. Further research efforts should consider thermal capacities of the adsorbent and heats of regeneration compared to established solvent amines.
Clean and affordable provision of water and energy are essential for achieving sustainable development. Researchers are studying the possibilities for improved and new water treatment technologies as well as alternative renewable energies. Great investments are spent for the energyintensive desalination plants in the Gulf region. Microbial desalination cell offers great promise of high salinity removal with zero energy input, and membrane bioreactors are of great reliability in treating domestic and industrial wastewater. The objective of this work is to introduce a hybrid system of membrane bioreactor and microbial desalination fuel cell for simultaneous wastewater treatment, seawater desalination and production of electricity. Synthetic wastewater, gulf seawater, potassium hexacyanoferrate, yeast and glucose are used as the anode feed, saline water feed, cathode oxidizing agent, biomass and substrate, respectively. In Comprehensive analyses of the treated water will be considered. Experimental tests will be performed while varying numerous parameters to achieve best system performance.
In this study, we demonstrate the potential of spent porous graphitic carbon (spentPGC) after aqueous sulfide removal from wastewater, as a lowcost sorbent for removing toxic and hazardous elemental mercury (Hg?) from natural gas. The performance was examined by treating the spent carbon with 50?g/m3 of Hg? in a continuous fixed bed flow reactor at a helium gas flow of 0.5 L/min. The adsorption results provide evidence that the presence and uniform distribution of sulfur moiety ascribed to the adsorption/oxidation of sulfide enables spentPGC to act as an efficient mercury scavenger. The high adsorption capacity of 382.5 ?g/g exhibited by spentPGC at 50?C was found to be comparable to that of leading activated carbon currently used for gaseous mercury removal. Thus, the utilization of waste sorbent (spentPGC) after sulfide remediation for mercury removal, can not only minimize the waste generation but also makes it more economical for gas processing industry.
Although silicon anode has an excellent battery performance, the massproduction of silicon anode is not easy due to high material cost of highpurity silicon. We proposed the usage of metallurgicalgrade silicon instead of highpurity silicon as anodes for lithiumion batteries. First cycle experiment of metallurgical silicon shows four times larger specific capacity compared to graphite. Metallurgical silicon has advantages of lower material cost and higher electrical conductivity compared to highpurity silicon.
The Vanadium Redox Flow Battery (VRFB) can provide high chargedischarge cycling capabilities, low crossover rates, and excellent flexibilities in terms of its design due to its decoupled energy density and power density characteristics. The electrolyte, comprising of the vanadium active species contributes to a large portion of the cost, and the possibility of utilizing lower purity sources of vanadium would greatly facilitate lower costs of the battery, which would be vital for further commercialization. However, the presence of larger amounts of impurities may have an effect on the performance of the electrodes. Our Cyclic voltammetry results reveal higher performance can be attained when higher purity of vanadium is used. Morphological characterizations results revealed that the electrodes were stable in both high and low purity electrolytes.
Biodiesel is a powerful alternate fuel that has one of the best feedstock in the form of Waste Cooking Oil (WCO). The biodiesel industry currently needs a continuous, compact, inexpensive and efficient reactor to make biodiesel flourish in the market and sonochemical reactors seems to be the best option. Hence, in this work a much needed task of a sonochemical reactor design development for biodiesel production is carried out through multiphysics simulations and experimental testing. From both simulation and experimental results we see above 90% conversion of biodiesel. Which implies the extremely good design.
