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- SourceAvailable from: Mohammad Yousefi[Show abstract] [Hide abstract]
ABSTRACT: The aim of this study was conducted to essay agrochemical application and energy use efficiency in the maize production systems in Dezful, Khuzestan Province in summer 2011. For this study data was collected using questionnaires and face to face interview with 30 farmers. Results showed that the average application of N and P (in form of P O) were 470 and132 KghaG respectively. Total inputs energy in maize 2 5 1 production systems was 29307.74 MJ/ha. 53% of input energy was related to agrochemical input that chemical fertilizer in which N and P and Pesticides consisted 48, 2.5 and 2.5 percent of total energy, respectively. Energy efficiency (output-input ratio) was 1.86 in the studied production systems. The total energy input consumed could be classified biological energy (11%) and industrial energy (89%).Middle East Journal of Scientific Research 01/2015; 9(2):153-156.
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ABSTRACT: Economic load dispatch (ELD) is one of the important optimization problems in the operation of power systems which can be helpful to create effective generating management plans. In this paper, the ELD problem is discussed considering transmission network losses and practical constraints of plants such as generation ramp rate, prohibited operation zones, and valve-point effects. A new method called Species-based Quantum Particle Swarm Optimization (SQPSO), which is based on the Quantum Particle Swarm Optimization (QPSO), is proposed and applied in order to solve this problem possessing non-smooth and smooth cost functions. In the proposed intelligent technique, the particles are classified according to the output results and they explore the answers in each iteration in-group form. The new method has just one control parameter. The simulation results and the numerical investigations of various examples are compared with other conventional techniques to assess the efficiency of the proposed method. The results of the numerical investigations well depict that in spite of its simplicity, the proposed method is superior over the other techniques from standpoint of optimum answer exploitation as well as possessing appropriate and acceptable speed and stability.International Journal of Electrical Power & Energy Systems 12/2014; 63:311–322. DOI:10.1016/j.ijepes.2014.05.066
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ABSTRACT: The effect of optical and acoustic phonon-scattering in the presence of line-edge-roughness (LER) on the electronic properties of ultra-scaled armchair graphene nano-ribbons (AGNRs) is investigated. Non-equilibrium Green’s function formalism (NEGF) is employed using a Hamiltonian formed from tight bonding model with consideration of first and third nearest neighbors. The combined effect of phonons and line edge roughness on the transmission, transport gap, and conductance are studied for different roughness strengths and AGNR lengths. Results show edge roughness slightly reduces the onset of optical phonon emission, acoustic phonons reduce off-state conductance and optical phonons reduce on-state conductance. In both cases, the degree and behavior of reduction is totally dependent on the intensity of edge roughness. Also, in the longer AGNRs with high edge roughness intensity, phonons increase the transport gap.Superlattices and Microstructures 11/2014; 75:268–277. DOI:10.1016/j.spmi.2014.07.045
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