Archives-J 

The voltammetry methods have revealed in the water of the Cotonou channel, the presence of organic and inorganic complexes of metals, such as: Zn-Carbonate, Zn2+, ZnSO4, Zn-OM, Cu-Carbonate, Cu2+, Cu(OH)2, Cu-OM, Pb-Carbonate, Pb2 +, Pb-OM, Cd-Carbonate, Cd2+, and Cd-OM. Their concentrations were variable with the water pH and depended on the season. At pH values ranging 6.5 - 7.2, metals were complexed by carbonate ions present in the water. Zinc is predominantly present as Zn2+ in the rainy season and Cu2+ levels were decreasing when pH was increasing. 80% of the total lead appeared to be complexed as Organic matter complex lead (Pb-OM), and cadmium (Cd-OM) which, unlike other metals, was mainly present in free Cd2+ form.

The use of various fixed beds having higher surface area is effective in removing organic matters and nutrients from municipal wastewater. Due to the higher specific surface area, fibrous materials are often considered a better choice for increased microbial support and treatment efficiency. In the present study two naturally available fibrous materials such as sisal and Oil palm Empty fruit Bunch (OPEFB) fibers having higher specific surface area were used as packing media in two different bio-reactors for sewage treatment, under batch mode and similar experimental conditions. Experimental results obtained were satisfactory at a packing density of 50 kg/m3. The reactors were continuously aerated for different contact times. At a contact time of 72 hours and Mixed Liquor Suspended Solids(MLSS) concentration ranging from 1500-2000 mg/L, the reactors filled with Sisal and OPEFB fibers shows satisfactory COD removal of 69.5% and 73%, BOD5 of 74% and 79.7%, NH3-N of 69% and 72.7%, and Ortho-phosphate of 81% and 82.3% respectively. The study reveals that these fibrous medias could be acceptable for efficient removal of organics and nutrients present in the sewage.

This present work aims to investigate dyeing performance of some new azo disperse dyes belonging to diazotization of 1, 4-bis (2-amino-1, 3, 4-thiadiazolyl) benzene and coupling with different amines as to comparing and contrasting depth obtained of shade and levelness. Some new dyes, such, has been examined, and assessed. The study was concerned mainly with dye uptake, behavior and efficiency. Color measurements, kinetics and thermodynamic parameters were involved. Conventional dyeing, was considered as control for obtained results.

4-(naphthalen-2-yl)thiazol-2-amine (I) on reaction with 2-bromo-1-arylethanone(IIa-f)yields6-Aryl-3-(naphthalen-2-yl)imidazo[2,1-b]thiazole (III a-f). The structures of all the compounds series (IIIa-f) were characterized analytically. The compounds were also monitored for anti microbial activity

The aim of this study was to examine factor structure and explore the psychometric properties for Urdu version of Test Anxiety Inventory. 2,145 secondary and higher secondary science students were selected as sample from the Punjab province in Pakistan appearing in 10th grade Board examinations. The value of alpha reliability for TAI was .893 in the pilot study. But in the final study, alpha reliability values for different scales of TAI (TAI-Total, TAI-Worry, and TAI-Emotionality) ranged from 0.66 to 0.81 with the individual student as the unit of analysis and from 0.71 to 0.88 with the class as the unit of analysis. Similarly, The discriminant validity of an individual student as unit of analysis ranged from 0.19 to 0.32 for three scales of TAI, while the discriminant validity for class as unit of analysis ranged from 0.27 to 0.40 for these scales of TAI. A three-factor structure consisting of TAI-Total, TAI-worry and TAI-Emotionality components showed acceptable discriminant validity and internal reliability.

The present research conducted to investigate the effect of pictorial context on reading comprehension of EFL readers . To carry out the research 30 students were selected . They were studying at Oxford Representative language center in Iran. And they were assigned to two equal groups : a) the experimental group , and b) the control group . The two groups were assumed to be homogeneous. The experimental group received pictures immediately before they read the passages while the control group did not receive any pictures before reading the texts . Four English passages followed by five multiple-choice questions were administrated to the subjects. A T-test was then used to compare the mean scores of the two groups. Then the result of the T-test indicated that the subjects in the experimental group who had received pictures before reading the passages , scored significantly higher than the subjects in the other group . Therefore , the hypothesis of this study was supported and it was concluded that pictorial context can be a beneficial device to improve reading comprehension of EFL readers . Finally , from the pedagogical point of view , the findings of this study have paved the way for material developers and EFL teachers to improve the reading comprehension of EFL readers.

In the present article, which aims at the examination of the effects of Islamic thought on the management and organization styles in Iran, Islam and Islamic thought have been explained at first. Then, with regard to the necessity to examine the Islamic management, the management and organization dimensions (creation of Islamic culture, the manner of the social Islamic structure establishment, the manner of the physical designation of the organization in the light of the Islamic style, etc) have been defined. The end goal of this article is to examine the effects of Islamic thought on the management mechanisms within the Islamic countries (the Islamic Republic of Iran as the case study). So, at the end of the present article, this effect will be investigated. The findings of 30 structured interviews show that the effect of Islamic thought on the manner of management in the organizations of an Islamic country is not so deep, and it is necessary to review the management knowledge in relation to the Islamic ideas and beliefs. In this regard, some suggestions are presented at the end of the article.

Energy and exergy efficiencies of a of a combined gas and steam power plant under different ambient conditions have been studied in this paper. Irreversibility rate of the plant and its major components were examined at different weather conditions. The effect of condenser pressure variation was considered in the energy and exergy analysis to present a better approach close to the actual condition. It was found that as ambient temperature decreases, exergy efficiency decreases while the energy efficiency remains almost constant. Also the exergy analyses show that the most irreversibility occurs in combustion engine following by gas turbine and compressor. The analyses also show that the condenser pressure is an important parameter that affects the output power, thermal and exergy efficiency of the cycle. Results of this research may help optimization of energy consumption and decreasing the pollution of the environment.

Experimental investigations were carried out to treat tannery wastewater effluent. Various surface-active materials were used to reduce the effect of chromium present in tannery wastewater. This chemical pretreatment was followed by a biological treatment. The aim was to evaluate and optimize the various parameters effecting the chromium removal during the treatment. Different coagulants were used to suggest the efficient surface-active material during chemical pre-treatment phase and thereby the optimum time of contact, dosage and pH were determined. In this present study chemical agents had been used as a pretreatment of tannery effluent to reduce the chromium (VI) whereas the biological treatment ensures rapid reduction in the chromium ions using the bacterial degradation process.

The ultrasonic velocity, density and viscosity in the pure as well as in the binary mixture of Tributyle Phosphate (TBP) and Carbon tetrachloride (CCl4) were measured. The variation of ultrasonic velocity and the other calculated acoustic parameters at temperature 300C for different frequencies shows significant information about the intermolecular interactions present in the binary mixture. The shifting of ?max in UV-visible spectra in the binary mixture agrees with the results of ultrasonic investigation of the binary mixture. The recovery of REE material like CeO2 with the help of this ultrasonic technique can be explained in terms of intermolecular interactions present in the binary mixture. Again the result provides an optimum value of the binary mixture for recovery of CeO2 which is well supported by other chemical treatments.