The possibility of the heavy metal ions determination and retention (with the example of copper ion) by a new Schiff base complex electropolymerization has been studied from the theoretical point of view. It has been shown that, despite of the absence of the surface instabilities, the probability of the oscillatory instability will be more expressed than in the case of the classical assisted polymer electrochemical deposition. Nevertheless, the steady-state stability is efficient, either from electronalytical, or from electrosynthetical point of view.

The possibility of purpurogallin electrochemical determination on an anode, modified by a new triazolic Schiff base, has been theoretically evaluated. The correspondent mathematical model has been developed and analyzed by means of linear stability theory and bifurcation analysis. It was shown that the Schiff base provides an efficient purpurogallin electrochemical determination in the presence of transition metal cations, forming complex. The proper basicity of Schiff base and triazolic ring favors the process. The steady-state stability is easy to establish. The oscillatory behavior, in this case, is possible, due to the double electric layer influences of the electrochemical stage.

Mysore district is one of the tourist destinations in Karnataka, India, with a population of about 10.25 lakhs. In all category of vehicles, 2-wheelers (2W) constitute more than 50 %. Vehicular count studies showed a maximum number of vehicles during peak traffic hours (7:00-11:00 hrs. and 18:00-22:00 hrs.). The maximum traffic count was observed for 2W (51-56%) followed by 4W (19-28%), LDV (light-duty vehicle), HDV (heavy-duty vehicle) and 3W. However, the percentage contribution of NO2 and PM10 emission factor showed, a maximum of HDV (75-89%) followed by LDV, 2W, 3W, and 4W. Emission loads for CO and NO2 pollutants were found to be high at link 1, 2, 5, 6, 12 and 13 due to heavy traffic densities. However, emission loads for PM10, PM2.5, and SO2 were notices to be very less in all the links. During winter season Industrial source complex short-term model 3 (ISCST3) and California line source model 4 (CALINE4) predicted NO2 concentrations were found to be ranging from 9–25 μg/m3 and 10–40 μg/m3, respectively. However, PM10 concentrations were found to be 18–43 μg/m3. The maximum concentration was found near to Receptors (R1-3), which may be due to maximum vehicular density and downwind to the pollution sources. NO2 and PM10 predictions made by ISCST3 and CALINE4 model showed a significant variation. It was also observed that CALINE4 model was not applicable to predict pollutant with lower concentrations.

This article aims to propose an approach for modeling the unsteady behavior of a horizontal axis wind turbine. The unsteady operation is supposed to be the consequence of a rapid variation of the pitch angle of the blades or the load of the wind turbine. The used vortex model has a limited number of elements, in order to reduce the time and volume of the required numerical computation. The wake behind the wind turbine is considered to be composed of small series of vortex rings in the near wake and one semi-infinite vortex cylinder in the far wake. This model is coupled with a blade element method, which allows fast determination of the momentum and power of the wind turbine. Field measurements of the Tjaereborg wind turbine are used as a reference for the validation of the proposed model. The results obtained with the numerical simulation show a good agreement with the measured experimental data

The objective of this work is to optimize the production of a low-cost activated carbon from Delonix regia (flamboyant) pods through chemical activation with ethanoic acid and carbonization (pyrolysis) process. The effect of production process variables; carbonization temperature, carbonization time and impregnation ratio on the activated carbon yield and surface area (using methylene blue number (MBN) and iodine value number (IVN) as indices) were evaluated using the D-Optimal design of experiment of response surface methodology (RSM). The influence of the production process variables on the Delonix regia pod-derived activated carbon (DRP-AC) was analysed using the analysis of variance (ANOVA) to identify the significant variables. The variations in yield, MBN and IVN of DRP-AC with respect to temperature, time and impregnation ratio were very significant. The quadratic regression models were found to be significant (p < 0.05) and well suitable and satisfactory ( > 0.95) in predicting the yield, MBN and IVN in relation to the production process variables. DRP-AC with maximum or optimum yield of 20.24%, optimum MBN of 71.89 mg/g and IVN of 80.45 mg/g was obtained using optimum production process conditions of: 500 oC (carbonization temperature), 60 min (carbonization time), and 3.78:1 (impregnation ratio). These experimental values were in good agreement with the values predicted by the model with relatively small percentage error (0.33). Fourier-infrared spectroscopy (FTIR) analysis of the surface of the DRP-ACs revealed the presence of adequate functional groups. Therefore, Delonix regia pods are good precursor for activated carbons production.

In this review, design and development of dyes (Functional, natural, aryl amine, Inorganic, ethylene linked planer rigid organic dyes) has been reported, beneficial for many applications, as Dye sensitized solar cell (DSSc), PDT, biomedical, photo chromic dyes, and optoelectronics. Photo chromic dyes have immense applications in optoelectronic materials, ophthalmic lenses for eye wear technology, optical data storage and in smart textiles due to their active response to light. Recent applications of functional dyes are in medical, such as for photo dynamic therapy. Functional dyes also have application in pH sensors and optical chemical sensors.

The theoretical description for amavadin electrochemical determination by poly(vedelolactone) doping has been given. The analysis of the correspondent mathematical model shows that amavadin may be electrochemically detected by efficient manner, using not only the polymer doping, but also the ion oxidation. The steady-state is easy to maintain stable, and the linearity of the dependence between the concentration and electrochemical parameter is formed easily. On the other hand, the oscillatory behavior in this case is more probable than in the common poly(vedelolactone) doping, due to the presence of additional anion electrooxidation in matrix.

The production of renewable energy depends on weather conditions. In the case of a photovoltaic generator the partial shading considerably reduces its output power capacity and can even cause the destruction of part or all of a panel. Once shaded, a cell is operating in reverse bias and it acts as a charge and dissipates energy, then the cell can be irreversibly damaged, we usually called these hot spot phenomena. In order to avoid this possible phenomenon, manufacturers have resorted to the use of bypass diodes and anti-return diodes. In this paper, we present a simulation of the shading effect of a photovoltaic generator composed of panels mounted in series and in parallel. We will compare the characteristics of power voltage (P-V) for different irradiances in the presence and absence of bypass diode. For the simulation, we will use the single diode model. The simulation is performed under PSIM software.

Inhibition performance of the heteroatoms organic compounds (HOC), namely Glutamic acid (GA), L-methionine (Meth), Cysteine (Cys) and phenyl mercapto tetrazol (PMT), as copper corrosion inhibitors for copper in 1M Acetic acid was investigated using Potentiodynamic polarization (PP) and electrochemical impedance spectroscopy (EIS) in the current study. The first comparative study distinguished GA and PMT as the best inhibitors from the HOC tested series. The detail study of PMT on the inhibition of the pure copper corrosion in 1M of Acetic Acid (AcA) solution showed that this compound exhibits a higher inhibition efficiency IE% at 5.10-4 M (89 %); moreover, IE% reaches 44 % at low concentration (10-5 M). The PP and EIS measurements indicate that the PMT molecules interacts with the copper surface forming a protective film in order to inhibit the corrosion by a physical chemical adsorption with respect to Langmuir adsorption isotherm model.

This article aims to model the entities of a Wind Energy Conversion System (WECS) based on Doubly Fed Induction Generator (DFIG), to design and then to synthesize the regulators using the base technique of Backstepping. The first one will make it possible to extract the maximum of the available wind energy taking into account the variation of the air density, and the second will control the transit of the active and reactive powers exchanged with the Grid utility. We will then present the results of the simulations of the set under the Matlab-Simulink environment.