This paper presents the new OTA-C transimpedance second-order continuous-time filters based on passive circuits using component substitution method. The resistor and inductor in these biquads are realized using OTA-C counterparts. The proposed biquads are attractive due to their advantageous features like ease of design, good sensitivity and orthogonal tunability of pole-Q. The biquads have been simulated using practical OTAs as well as their behavioral macro-model and the results are given to verify the theoretical analysis.

The main objective of the present study was to present the structural pattern of electronic learning and intellectual capital in the special economic zone of Abadan port. The study method was a descriptive one of regression type. The study population included all the managers, assistants, experts and employees in the special economic zone of Abadan port. According to the total counting 40 managers, and using simple random sampling 180 employees were selected as the study samples based on the sample size determining table of Morgan and Karajcy. The evaluation tools were Electronic learning questionnaires and the Benitez standard questionnaire of intellectual capital, and the reliability for the intellectual questionnaire and organizational learning questionnaire were evaluated 0.95 and 0.94 respectively. Results showed that there is a relationship between electronic learning and intellectual capital

For an effective crisis management, advanced communications are of great importance. Lack of communication, directly decreases the level of situation awareness of the senior managers and rescuers at place of the accident. Establishing and maintaining lines of direct contact between decision makers, both formal and informal rescuers, government officials and the general public, is a primary objective in all crisis management planning. This article, by applying advances in technology, which allows high dynamism and mobility in telecommunication systems, introduces a new level of flexibility in commanding and operational structures

— The prospect of utilizing wind energy for electricity generation in urban areas seems to be inefficient, owing to low wind speeds and the turbulence caused by surrounding obstacles. However, these challenges can be overcome by integrating a power augmentation device called an omni-direction-guide -vane (ODGV) to further increase the oncoming wind speed for better performance of wind turbines. This study aims to investigate the influence of the ODGV in the feasibility and optimization of a stand-alone hybrid renewable energy system in a low wind speed area in Malaysia. The HOMER (Hybrid Optimization Model for Electric Renewable) software package was used for the analysis of the simulation. Two case scenarios were analyzed, case 1, is using Wind-PV-Diesel-Battery system with the presence of the ODGV and case 2 is the Wind-PV-Diesel-Battery system without the presence of ODGV. Thousands of simulations were carried out to achieve optimal autonomous system configurations. Four scenarios were evaluated in both cases. The assessment criteria comprises of the Net Present Cost (NPC), Cost of Energy (COE), amount of CO2 emitted and the Renewable Fraction (RF). Comparison was made between the best scenarios in case 1 and case 2. The results indicate that scenario 1, in case 1 (WT-PV-DG- Battery) system is the most feasible, optimized, cost effective and environmental friendly system among other configurations . The economics analysis reveals that with case 1 scenario 1, $4,795 of the total NPC and $0.021/kWh of the COE can be saved respectively. Moreover, the results of the environmental analysis indicates that 438kg/yr (2.3%) of CO2 emitted could be reduced by the system in case 1 scenario 1 and 25% of renewable fraction is achieved

The variable structure roll autopilot is designed with reaching law approach. Aiming at solving the chattering problem caused by sign function, the saturation function is introduced. In order to improve the system, a new reaching law is proposed on the basis of the conventional exponential reaching law. Furthermore, to prove the efficiency of the variable structure control autopilot, a classical autopilot is also designed. Simulation results indicate the efficiency of variable structure control autopilot, and the new reaching law improves the system more

— In the current study, an anchored diaphragm wall design in C-Φ soil condition is optimized using genetic algorithm. Fixed earth support method is implemented for the design of the wall. The depth of the embedment and the magnitude of tensile force at anchor are determined. The design problem is formulated as a non-linear mathematical programming problem using FORTRAN 95. The analysis and design is carried out by varying the positions of the anchor rod. The anchor position is randomly chosen during the computation to obtain and optimize the total cost. Genetic Algorithm (GA) is employed to obtain the optimum position of the anchor based on minimum cost. The influence of different GA parameters (population size, number of generations, crossover probability and mutation probability) on the solution is studied and the results are tabulated

Rare earth samarium doped zinc borate glass system based on 30 ZnF2 – 20 TeO2 – (50-x) B2O3 – x Sm2O3, (where x = 0, 0.5, 1.0, 1.5, 2.0, 2.5 mol%) were prepared. The density of each glass was measured and the molar volume was calculated. Makishima and Mackenzie (M-M) models gave reasonable estimation for different constants of elasticity (Young’s modulus (E), Bulk modulus (K), Shear modulus (S), Poisson’s ratio (ϑ)). Vickers (Hv) indentation tests were performed on the series of glass samples. These connections were used to relate the conventional Hardness (H). Fracture toughness (KIC), Dissociation energy (Gi) and Packing density (Vt) were also investigated. The relationship between Machinability and Brittleness of glass materials were studied. Exposition of the M-M model proved to be good for the constants of elasticity of ZnF2–TeO2–B2O3–Sm2O3 glasses

This study report the effect of temperature on the crystalline phases of PVDF from N,N- dimethylaformamide ( DMF) solution. PVDF thin films were prepared via a spin coating of a PVDF/DMF solution. The films were annealed at 60°C, 90°C, 110°C and 140°C for 5 hours addition to the room temperature 30°C. The morphology of the PVDF thin films which investigated by using SEM spectroscopy. It appeared that the surface rough and micro-pore and spherulitic structure. The size of micro-pore reduced with increasing the annealing temperature. The crystalline structures of PVDF thin films were investigated by using the XRD and FTIR techniques which seemed the change in the crystalline phase with a variation annealing temperatures

Polymeric materials that are used in photonic devices gain a strong interest by scientific researchers. To improve their optical properties, there is a need to focus on polymeric nanocomposites. In the present work, pure PVDF and PVDF/ZnO nanocomposite films have been prepared by using a casting method. Acetone is used as the solvent for the polymer. PVDF/ZnO nanocomposites are prepared by mixing ZnO nanoparticles with polyvinylidene fluoride (PVDF) as the polymer matrix. Different contents of ZnO nanoparticles are used as the filler.Analysis of FTIR spectra confirmed the formation α and β phases. The transmittance, absorbance and reflectance spectra are tested. They showed a very low transmittance and a high absorbance in the UV region. The linear absorption and extension coefficients are calculated. They depended on the concentration of ZnO nanoparticles in the nanocomposites. Evaluation of the refractive index is also carried out. SEM and FESEM images of the samples showed that their surfaces are rough.

Porosity and its thickness are important factors in determination of luminescence efficiency in semiconductor devices. Here the relationship between etching time and current density of p-type porous silicon (PSi) with porosity and its thickness need to be determined. Three set of p-type PSi samples were prepared by using an electrochemical method under three current densities (10, 20 and 30 mA/cm2) with different etching times (20, 40, 60 and 80 min). It is found that the porosity and porous thickness are increased with the increase of current density or etching time. The porosity and its thickness increased initially up to 40 min but the increment is slow for porosity and is faster for its thickness after further increment of etching time. These two parameters (porosity and its thickness) increased almost linearly with the increase of current density

— Replacing the sequence of vectors with a net indexed by an ordered set where the set is endowed with a measure space, we obtain a generalization of discrete frames which is called continuous p-frames. The problem of combining the synthesis and analysis operators of these frames is solved in this paper. We also prove that a perturbation of a weakly measurable function G of a cp-frame F is again a cp-frame when there is a small enough gap between F and G

The aim of this work is to optimize factors involving in a transportation system by using combined technique of Response Surface Methodology (RSM) and Artificial Neural Network (ANN) .The main idea of RSM is to use a set of designed experiments to obtain an optimal response. In this article ANN was used as a means to improve the estimation in the RSM for optimization of transportation system with using secondary data’s. The carry weight by this system was considered as a dependent variable and five independent variables, namely number of Van, Lorry, Truck, Labors and Fuel consumption. Using the ANN, the optimal configuration of the ANN model was found to be 7-4-1 and carry weights of each combination factors was predicted by this model. Predicted DV values from ANN were applied for RSM. The experiment was carried out based on 2-level, 5-variable Central Composite Design (CCD) in RSM and achieved optimal combination factors based on minimum cost. This approach leads to reducing the system cost. Furthermore, it is proposed to use simulated with ANN to consider high capability of carry weight prediction based on IV factors

Shaidu area situated in Peshawar Basin lies in district Nowshera, Khyber Pakhtunkhwa. This area in mainly composed of gravels, sand, silt and cobbles. This area is investigated for the occurrence of placer gold and also to develop an economical, feasible and environmentally safe method. Mineralogical and chemical studies of the collection of samples of the pan concentrates, shaking table showed visible placer gold particles. These particles vary in size and morphology. The gold particles are neither too fine nor coarse. Amalgamation is the most suitable method to recover gold. These sediments show a high concentration of gold. This gold is of high economical grade and values. Its high recoveries can be obtained by constructing the amalgamation plant at the site.

rationale: lung cancer is a formidable disease as only 15% of lung cancer cases are diagnosed at early stage when curative treatment is possible. screening test has been proven to reduce mortality by 20%. my objective was to develop simplified chemiresistor based electronic nose technology (scent) which could detect lung cancer olfactory signals in the breath, so it could be used as home-used lung cancer screening tool.