The Impact of L1 on Iranian EFL Learners’ vocabulary Retention

The Impact of L1 on Iranian EFL Learners’ vocabulary Retention

… Download …


Part of #The Impact of L1 on Iranian EFL Learners’ vocabulary Retention# :

Publishing year : 2015

Conference : Third International Conference on Applied Research in Language Studies

Number of pages : 8

Abstract: Vocabulary knowledge is important because it involves all the words we need to know to access our background knowledge, express our ideas, communicate effectively and learn about new concepts. The students need not only learn a lot of words but to remember them. This study examines the impact of L1 on Iranian EFL learners vocabulary retention. To conduct this study, 82 female students were randomly selected from a foreign language institute in Golpayegan, Iran. They were divided into two groups: experimental group, those learners who received the vocabulary through L1 (mother language) and control group, those learners who received the vocabulary through a foreign language. A well-known proficiency test (Nelson series, 050 D) was used. A suitable vocabulary test used for pre-test, post test, and delay post test. There were thr treatment sessions for both groups. In treatment sessions, L1 (mother language) was used for experimental group and foreign language was used for control group. Making sure of their homogeneity and administering a suitable vocabulary test, statistical analysis, MANCOVA and descriptive statistics, revealed that subjects in the experimental group surpassed those in the control group in vocabulary learning

Investigation of the effect of ultrasonic waves on the enhancement of efficiency of direct photolysis and photooxidation processes on the removal of a model contaminant from textile industry

Investigation of the effect of ultrasonic waves on the enhancement of efficiency of direct photolysis and photooxidation processes on the removal of a model contaminant from textile industry

… Download …


Part of #Investigation of the effect of ultrasonic waves on the enhancement of efficiency of direct photolysis and photooxidation processes on the removal of a model contaminant from textile industry# :

Publishing year : 2007

Conference : 5th International Congress of Chemical Engineering

Number of pages : 11

Abstract: The effect of ultrasonic waves (US) was studied on the degradation of Malachite Green (MG) as a model contaminating the textile industry through direct photolysis with ultraviolet (UV) radiation and UV / H2O2 processes. The US (35 kHz) and UV (253.7 nm) radiations were performed with an ultrasonic bath and a 15 W low pressure mercury lamp, respectively. Degradation of MG follows the pseudo-first order kinetics in all cases. The apparent reaction rate constant (kap) for the UV / US process is greater than the sum of UV and US processes, but it is relatively low for practical uses. However UV / H2O2 treatment more efficiently decomposes this organic contaminant and combines this process with the US can improve its efficiency. The cap is influenced by a variation of operating parameters such as power density, temperature, initial concentration of MG and H2O2 for US / UV / H2O2 process and activation energy was 9 kJ mol -1 in the range of 294-307 K for this process.

A STUDY OF MICROBIAL INFLUENCED CORROSION IN OIL AND GAS INDUSTRY

A STUDY OF MICROBIAL INFLUENCED CORROSION IN OIL AND GAS INDUSTRY

… Download …


Part of #A STUDY OF MICROBIAL INFLUENCED CORROSION IN OIL AND GAS INDUSTRY# :

Publishing year : 2012

Conference : The first international conference on oil, gas, petrochemicals and power plants

Number of pages : 11

Abstract: Microbiologically Influenced Corrosion (MIC) has been the subject of extensive studies. Some of the bacteria are capable of sensing surfaces. Contacting the surface initiates a complex differentiation program resulting in e.g. Synthesis of alginates. Metal surfaces are rapidly colonized by microorganisms in contact with natural or industrial aquatic environments, resulting in a complex and strongly adhering microbial community, termed as biofilm. The biofilm accumulation not only protects the microbial cells from the external environment, but also is detrimental to the underlying substrate thereby causing physical degradation or biodeterioration of the metal surface. In order to circumvent this problem, numerous biocides have been tried, but, unfortunately, have failed to produce expected results. An increased dose of a biocide may or may not succeed in overcoming the protection provided by this polysaccharide coating, because these polymers limit the biofilm permeability to most biocides

Experimental and numerical studies of the mechanical behavior of mollusk shells

Experimental and numerical studies of the mechanical behavior of mollusk shells

… Download …


Part of #Experimental and numerical studies of the mechanical behavior of mollusk shells# :

Publishing year : 2013

Conference : Biennial International Conference on Experimental Solids Mechanics

Number of pages : 9

Abstract: This paper presents a combination of experimental and numerical techniques to investigate the mechanical behavior of mollusk shells. For this purpose, the primary models of the shells are developed based on the governing mathematical equations. The intersection points on the surface of the shell models are numerically identified and then used to remove extra interior parts. The non-uniform rational B-spline (NURBS) equations representing the mollusk shell surface are generated using the curve fitting method. The advancing front technique is used to generate an adaptive finite element (FE) mesh over the shell. The final 3D generated meshed models accurately describe the spatial configuration of the mollusk shells as well as their interior architectures. Experimental X-ray imaging technique is utilized to show the similarity between the developed models and the real samples. Scanning electron microscopy (SEM) is used to provide information on the microstructure of the shells. Experimental compression tests are conducted to provide comparisons between the mechanical behavior of models and mollusc shell samples under external loading conditions. The results of this work may be useful in the design of new engineering structures.

Effect of current density on size and morphology of ThO2

Effect of current density on size and morphology of ThO2

… Download …


Part of #Effect of current density on size and morphology of ThO2# :

Publishing year : 2016

Conference : 13 th Scientific Conference of Student of Materials Engineering and Metallurgy of Iran

Number of pages : 9

Abstract: Thorium oxide has important uses in nuclear industry. In all of the usages, the thoria particles size and uniformity are the point. Therefore, the finer and the more uniform particles of thoria fuel are, the better results-such as flatter flux in the nuclear industry will be. There is a variety of methods for producing thorium dioxide. In this research, using the fast, clean, and novel method of electrodeposition, the effect of current density on the size and morphology of ThO2 has been investigated.

The Effect of Biaxial Loading on the Buckling of Simply Supported Thick Rectangular Plates

The Effect of Biaxial Loading on the Buckling of Simply Supported Thick Rectangular Plates

… Download …


Part of #The Effect of Biaxial Loading on the Buckling of Simply Supported Thick Rectangular Plates# :

Publishing year : 2015

Conference : 10th International Congress of Civil Engineering

Number of pages : 8

Abstract: By increasing the thickness of plates, the effects of shear strains are more pronounced and implementing thin-walled structure theories, which neglect the shear deformations, yield high inaccuracy. On the other side, including the shear deformations in analyzes, makes the process so difficult and in exact solutions somehow impossible to solve. Buckling analysis of structures is generally intricate, and for plates, even thin plates, finding the buckling loads are probed by researchers. So it is clear that the buckling analysis of thick plates, especially in biaxially loaded plates by exact methods, would be noteworthy, which is presented in this paper. Herein, by implementing an effective exact method, the effect of biaxial loading on the thick isotropic rectangular plates is considered. This is done by analyzing several cases of plates with different aspect ratios, different thickness ratios, and under different combinations of uni- or biaxial loads

Effect of selected parameters on wave reflection from perforated-wall caisson breakwaters

Effect of selected parameters on wave reflection from perforated-wall caisson breakwaters

… Download …


Part of #Effect of selected parameters on wave reflection from perforated-wall caisson breakwaters# :

Publishing year : 2012

Conference : The 9th International Conference on Coastal, Ports and Marine Structures

Number of pages : 8

Abstract: This paper describes the results of a numerical study on wave reflection from perforated-wall caisson breakwaters. There are basic parameters defining the geometry and shape of a perforated wallcaisson breakwater such as: the width of the wave chamber, the perforated wall thickness and the porosity degree. In this study, the effect of the geometry of the caisson structure on the reflection of irregular waves are presented. A numerical code was developed to model the wave reflection from perforated breakwater in MATLAB. Small-amplitude wave theory has been used to simulate the behavior of irregular waves reflected from caisson breakwaters having different geometries. The results show that the shape and size of the slits have a great role in damping and absorbing incident wave energy.

THE IMPACT OF SPARKLING MECHANISM ON IMPROVING OIL RECOVERY THROUGH NANO-PARTICLE INJECTION – EXPERIMENTAL STUDY

THE IMPACT OF SPARKLING MECHANISM ON IMPROVING OIL RECOVERY THROUGH NANO-PARTICLE INJECTION – EXPERIMENTAL STUDY

… Download …


Part of #THE IMPACT OF SPARKLING MECHANISM ON IMPROVING OIL RECOVERY THROUGH NANO-PARTICLE INJECTION – EXPERIMENTAL STUDY# :

Publishing year : 2012

Conference : The first international conference on oil, gas, petrochemicals and power plants

Number of pages : 5

Abstract: Nano-material and nano-particles are used in oilfields to enhance injection processes by changing the wettability of porous media, increasing the viscosity of the injecting fluid, decreasing the interfacial tension between the injection fluid and the reservoir fluid. Light-alcohol-based Nano-fluids reduce the undercutting of the injection fluid and improve the vertical sweep efficiency. In addition, the small amount of nanoparticles makes it possible to push the oil in the small poresthat remains unrecoverable in the polymer injection (called Inaccessible Pore Volume). In addition to continuous fluid bulks, there is another advantage of dispersed particles; Dispersed particles can hit the porous media wall and remove the oil on the wall. This mechanism, which is called sparkling, significantly improves the oil recovery factor in comparison with the same viscosity polymeric fluid

Assessment of empirical/theoretical relative permeability correlations for gas-oil/condensate systems

Assessment of empirical/theoretical relative permeability correlations for gas-oil/condensate systems

… Download …


Part of #Assessment of empirical/theoretical relative permeability correlations for gas-oil/condensate systems# :

Publishing year : 2016

Conference : First Biennial Conference on Oil, Gas and Petrochemicals of the Persian Gulf

Number of pages : 11

Abstract: One of the key parameters in porous media is relative permeability, especially its application in modeling and simulation of multiphase flow. The common ways for determining relative permeability are empirical correlations and analytical mathematical models. Generally, these models are presented as a function of saturation. In this study, we evaluate ten common and widely used empirical and analytical models, which are presented for the estimation of two-phase relative permeability of gas-oil / condensate systems. For evaluation purposes, 274 experimental data points are used for gas-oil / condensate systems. Adjustment and nonlinear local and global optimization are performed to determine the adjustable parameters of parametric models. According to the performed adjustment and optimization, Lomeland Ebeltoft Thomas (LET) three parameter analytical correlations showed the best agreement with the experimental values for both gas and oil / condensate relative permeability

Properties of Alternative Liquids to Mineraloil for Transformers

Properties of Alternative Liquids to Mineraloil for Transformers

… Download …


Part of #Properties of Alternative Liquids to Mineraloil for Transformers# :

Publishing year : 2005

Conference : Twentieth International Power Conference

Number of pages : 10

Abstract: Since many years, ester liquids are used as an alternative to insulating liquid to mineral oil in distribution transformers. The major advantage of the application of these fluids is their improved environmental compatibility. But these liquids comprise several additional advantages, which are at first their lower inflammability. Power transformers contain several tons of insulating liquid, which can cause a long lasting fire
in case of a transformer tank rupture due to winding failures. Meanwhile there are many good experiences regarding the use of ester liquid Midel 7131 in distribution transformers. This good experience encourages the manufacturer of transformers to use this liquid in power transformers. Due to the larger dimensions of power transformers in comparison with distribution transformers, special consideration is necessary.
The contribution presents some results of investigations concerning the electrical and dielectric behavior of ester liquids in comparison with mineral based transformer oil. Furthermore, the performance of ester liquid Midel 7131 and mineral oil mixtures related to the electrical behavior is
introduced.