Rethinking Teaching: Conceptions of Learning Change and Learning Management

 Promoting excellence in teaching and boosting learners’ performance is and has always been the corner stone of education in general and in the foreign language classroom in particular. This article addresses the issue of the problematic way of teaching and catering for students with individual differences for a better interaction. Consequently, instructors are often confused and the questions of which teaching approach or learning theory to adopt often arises. The aim of this article is to explore how a teacher should teach in a foreign language classroom. Should a teacher adopt a learner-centered approach or a teacher-centered one? This paper also provides brief guidance to teachers on how to manage learners’ learning styles in the English language classroom for better instructional practices

Quinone Methides Related to 1-Naphthol

This thesis contains three short reviews as follows: 1. Reaction of 1-naphthol with electrophiles 2. Formylation of 1-naphthol 3. Preparation methods and different types of reactions of quinone methides. Repetition of treatment of 1-naphthol with carbon disulphide and then dibromoethane gives the two isomeric quinonemethides (A) and (B) and not, as claimed earlier, exclusively the para isomer. The major product of this reaction is proved to be the ortho one by detailed analysis of its spectra and by reduction via a dihydroderivative to 2-methyl-1-naphthol which was prepared independently for comparison. The para isomer is present in very small amount but it can be isolated by chromatography and its structure confirmed spectroscopically. This thesis describes an investigation of a specific route to the para isomer. Several methods to formylate 1-naphthol were investigated. The Gattermann Adams reaction proved most effective. The dihydrophenol (c) was made from 4-formyl-1-naphthol but attempts using a wide range of oxidising agents failed to convert it to (A). The 2-bromoderivative also failed to undergo clean oxidation. 2-Methyl-naphthoquinonemethide (D) was prepared by the CS2 reaction and characterised, but 2-chloro- and 2-bromonaphthols failed to give the corresponding quinone methide. Changing the solvent of the original reaction of 1-naphthol gave the two isomers in the ratio (1:1). The two isomers were successfully isolated and fully characterised and their spectra is reported. The nmr spectra of (A) were found to be affected by the presence of acid

Influences des instabilités convectives sur l'état de surface final des films polymères fabriqués par procédé de séchage

Polymer film formation from drying of polymer solution is very important process for many applications: coating, printing, nanotechnology. Some applications (automobile coatings) require films with high surface quality with a roughness in range of visible light wavelength. Often drying polymer solutions yields corrugated surfaces. This corrugation can be due to: 1) mechanical instabilities due to buckling of dried surface resulting from a heterogeneous evaporation; 2) hydrodynamic instabilities. In this work we studied in situ the formation of corrugated surface and we related these mechanisms to hydrodynamic convections

Distribution of naturally occurring radionuclides (U, Th) in Timahdit black shale (Morocco)

Attention has been focused recently on the use of Moroccan black oil shale as the raw material for production of a new type of adsorbent and its application to U and Th removal from contaminated wastewaters. The purpose of the present work is to provide a better understanding of the composition and structure of this shale and to determine its natural content in uranium and thorium. A black shale collected from Timahdit (Morocco) was analyzed by powder X-ray diffraction and SEM techniques. It was found that calcite, dolomite, quartz and clays constitute the main composition of the inorganic matrix. Pyrite crystals are also present. A selective leaching procedure, followed by radiochemical purification and α-counting, was performed to assess the distribution of naturally occurring radionuclides. Leaching results indicate that 238U, 235U, 234U, 232Th, 230Th and 228Th have multiple modes of occurrence in the shale. U is interpreted to have been concentrated under anaerobic conditions. An integrated isotopic approach showed the preferential mobilization of uranium carried by humic acids to carbonate and apatite phases. Th is partitioned between silicate minerals and pyrite

Test de l’Effet de la Fiscalité Foncière sur l’Investissement Touristique

The purpose of this paper is to test if there exists an eviction of the private tourism investment by the level of land tax (patent tax and urban tax), linked to investment. The consideration of land tax variable and that of public infrastructure expenditure in the private investment equation allows to model and next to test the effect of fiscal system on the private investment. The anticipated demand seems to have an accelerator effects on tourism investment. In revenge, the land tax based on the level of tourism GDP remains with a negative effect, but it is neatly lower as than the effect, which the land tax would have when this tax is based on the investment level. This fiscal strategy could help to generate income for the human factor operating in the tourism sector

Novel recoil nuclei detectors to qualify the AMANDE facility as a Standard for mono-energetic neutron fields

The AMANDE facility at IRSN-Cadarache produces mono-energetic neutron fields from 2 keV to 20 MeV with metrological quality. To be considered as a standard facility, characteristics of neutron field i.e fluence distribution must be well known by a device using absolute measurements. The development of new detector systems allowing a direct measurement of neutron energy and fluence has started in 2006. Using the proton recoil telescope principle with the goal of increase the efficiency, two systems with full localization are studied. A proton recoil telescope using CMOS sensor (CMOS-RPT) is studied for measurements at high energies and the helium 4 gaseous micro-time projection chamber (microTPC He4) will be dedicated to the lowest energies. Simulations of the two systems were performed with the transport Monte Carlo code MCNPX, to choose the components and the geometry, to optimize the efficiency and detection limits of both devices or to estimate performances expected. First preliminary measurements realised in 2008 demonstrated the proof of principle of these novel detectors for neutron metrology.Comment: to appear in Radiation Measurements, Proc. of 24th International Conference on Nuclear Tracks in Solids (Bologna, 1-5 September 2008

AlphaRad, a new integrated CMOS System-on-Chip for high efficiency alpha particles counting

An integrated System-on-Chip (SoC) has been designed in 0.6 \mu m CMOS mixed analog/digital technology, and tested for high rate alpha particle Counting. The sensor is the most innovative part of the chip, with a total active area of 2 x 2.5 mm x 5 mm. The two-stage charge-to-voltage amplification scheme includes a numerical block for offset compensation. Designed with a gain of 700, the chip has been tested in alpha sources: a very high signal over noise ratio was obtained, leading to a detection efficiency of 5 MeV alpha particles close to 100%. The chip is working at room temperature and has been tested tip to 300 kHz reset frequency. Future applications of this SoC will focus on detection of fast and thermal neutrons free of gamma contamination

Effect of Aloe Vera wastes on physico-chemical properties and microbiological activity in soils

The aim of the present study was to explore the potential for using aloe vera wastes as amendment for soil to improve its fertility. Soil was exposed to four concentrations of aloin (rich in HAP) for 0, 7, 14 and 28 days. Physico-chemical parameters were analyzed: soil Ph, organic matter (OM), nitrogen, phosphorus, and cation exchange capacity (CEC). The activity of seven enzymes implicated in the C, N and S cycles were measured. Microbial Biomass was determined by the method of substrate induced respiration. BiologEcoplates (Biolog Inc., Hayward, CA) were used to estimate soil microbial functional diversity. Our findings suggested a decrease on phosphorus and nitrogen content and an increase on CEC after aloin addition. Also, a decrease on microbial biomass and enzymes activities was observed, except for FDA. Ecoplates results demonstrate a decrease on microbial activities depending on the incubation time. Moreover, our results indicated that bacterial communities of the tested soils have more affinity to consume substrates as Amino acids and polymers. Our results should be carefully considered in view of the agriculture waists reuse for a sustainable agricultur