Characteristics of mass transfer, heat transfer on the free convection flow of an incompressible fluid past an infinite isothermal vertical plate which is exponentially accelerated in the presence of magnetic field is studied. Mass diffusion is considered to be uniform. The partial differential equations are converted into non-dimensionless form and solved by laplace transform method. Profiles of velocity, temperature and concentration are depicted graphically for different thermo physical parameters. The effect of skin friction are also presented.

The calibration of the 4π NaI(Tl) gamma ray spectrometer that was developed for the in vivo neutron activation analysis, (NAA), has been carried out analytically using the probability correction approach. Homogeneously distributed radioactive sources (point and bar) have been used and positioned in the middle of the rectangular hollow part of the spectrometer. Accurate calculation of all possible path lengths covered by the gamma rays inside the bulky source has been used to improve expressions for the source self-attenuation coefficient. In addition, the full-energy peak attenuation coefficient, µp, and corrected coincidence summing effect are included in the present algorithm. A remarkable agreement between the corrected calculated full energy peak and total efficiency values with the reported measured ones was observed in case of using point sources with largest discrepancies being less than 2 % and 1 %. However, a comparison with the simulated efficiencies in case of bar sources showed a reasonably low percentage relative difference between the calculated and the reported simulated results. Moreover, the present approach showed accuracy up to 30 % and 50 % more than the ordinary direct mathematical method that has been reported earlier in calculating the total and peak efficiencies.

The design and implementation of an operating system at a distance for industrial type manipulator robots using the Internet as a communication route between an operator and a robotized system is presented. A visual feeddback system using virtual reality that allows knowing at all times the robot\'s performance, and an adaptive control system to command the robot\'s movements are designed and implemented. At the same time that the robot is teleoperated, the server supervises automatically the state of the connection to the Internet, thanks to which the control system acts adequately upon a disconnection contingency, ensuring the integrity of the process that is being executed and of the robot itself.

The scattering problem of Zakharov-Shabat equations in one-dimension associated with the inverse scattering transform technique for solving the nonlinear Schrödinger equation is reformulated as a variational problem in 1+1 dimensions. We extend the derivation to the variational principle for the Zakharov-Shabat equations (Kaup and Malomed, 1995) to 1+1 dimensions. We developed an approximate analytical technique for finding discrete eigenvalues of the complex spectral parameters in Zakharov-Shabat equations for a given pulse-shaped potential, which is equivalent to the physically important problem of finding the soliton content of the given initial pulse. We demonstrated that the simplest version of the variational approximation, based on trial functions with one, two and n-free parameters respectively, and treated analytically.

The article deals with understanding in modern education of the process of formation of professional competence of a future teacher to development of creative abilities of pupils and separate categorical concepts. It reveals their main sense in a context of professional pedagogical education and use of the means, helping to develop abilities of the pedagogical higher education institution graduate to work in various conditions of real pedagogical reality. The authors analyze the process of formation of professional competence of the future teacher.\nThe process of formation of competence we see in complete unity of activity of interacting subjects - teachers and students on development of the required quality throughout the whole teaching-educational process.

A mathematical model of cylindrical nano-beam with constant elastic parameters will be constructed and the governing equations will be taken when the beam is quiescent first. Laplace transforms techniques will be used to get the general solution for any set of boundary conditions. The solution will be obtained for a certain model when the beam is subjected to ramp-type heating and the two ends of the beam will be clamped. Inversion of Laplace transforms will be obtained numerically, and the results will be presented graphically with some comparisons to study the impact of the ramping time parameter and the relaxation time on the speed of progress of mechanical and thermal waves through the beam.

Carrier bags are mainly made from paper or plastic. Nowadays, most plastic carrier bags are made of polyethylene. Plastic bags hold up better than paper bags when wet, such as in rain. Plastic bags are commonly reused as either garbage bags, or can be recycled along with other plastic containers. Low density polyethylene (LDPE) and linear low density polyethylene (LLDPE) belong to polyethylene group of thermoplastics. LDPE is generally the softest and least crystalline of all the polyethylene. LDPE has a unique combination of properties namely toughness, high impact strength, low-brittleness temperature, flexibility, processibility, film transparency, chemical resistance. LDPE applications are mostly film based. The most common application areas are in general food packaging, milk pouches, industrial products, textiles, frozen foods, agriculture and horticulture section etc. The purpose of this research is to study the decomposition of virgin plastics and recycle plastics with additives. The experiment was conducted by burying the sample in soil, mixed with additives and by adding with municipal solid waste in a close bottle and by exposing it to sunlight. The sample was analyzed for every three months and it was found that waste/recycled plastics with additives starts degrading from the 12th month and gives a comparatively good result.

Farmer\'s income in Iran are always exposed to major risks as price risks which is because of the lack of risk management tools as futures and option contract in Iran agricultural commodity market. Futures contract is a bilateral obligatory contract in which both buyers and sellers are committed to trade defined amount of underlying asset for specified price and delivery date in future. Major benefits of future contract are price discovery, price transparency, risk management and reducing transaction fees. Recent studies showed that about one-third of commodity futures contract were successful. So investigating success factors of futures contract is vital for feasibility study on successful launching of agricultural products futures market in Iran Mercantile Exchange. We use future contract volume as a proxy for success and dependent variable and cash market size, price volatility, commodity trade-production ratio and basis risk as independent variables.In this study data from exchanges in asia and Middle East during 2000-2012 and relevant countries macroeconomics variables, published in their websites and FAOSTAT database, are used. By using panel data approach, effects of variables on future contract volume as a proxy for success are investigated. After estimating optimum model, by using domestic data of Iran, farm and orchard agricultural commodity at 1391 are ranked as successful and suitable future contract underlying asset.\nResults showed that agricultural commodity as wheat, tomato, corn, potato, sugar beet and barely are the most suitable product as successful future contract underlying asset in Iran agricultural commodity market, respectively.

This article aiming to identify the factors affected on creating the phenomenon of Flood, to specify areas with zonation and potential Flood in Kelardasht City was performed by Hierarchical Analysis Process (AHP). The purpose of this study is to predict the hazard of mass movements in Kelardasht City, through Analytical Hierarchy Process (AHP). Initially, by reviewing research sources related to the subject, some important influential factors are prepared and digitized as independent variables in the environment of geographical information systems. At the next stage, the hazard zonation map of Flood with different sensitivities is prepared through AHP method. Obtained results show that the area of study is highly exposed to Flood with high sensitivity