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Electrical impedance spectroscopy is used to study the retina and the vitreous humor which can help in designing retinal stimulation experiments. Electrical stimulation of retina is done to artificially stimulate retinal neurons for restoring vision in blind patients. The stimulus is given through microelectrodes which are placed over the retina. Since retina is an inhomogeneous conductive medium...
Interest in amorphous silicon and carbon alloys is always actual mainly due to their particular advantages in comparison to conventional crystalline materials. The amorphous silicon carbide may be used in a number of micro-mechanical and micro-electronics applications and also for photovoltaic energy conversion devices. Boron doped thin layers of amorphous silicon carbide, presented in this paper,...
An improved estimation method of electrochemical impedance equivalent circuits' parameters is proposed. The method allows to decrease estimation errors of an electrolyte resistance in up to 6.5 times, a double layer capacitance - up to 5.8 times, and a charge transfer resistance - up to twice. The accuracy of Warburg constant estimation remains unchanged. To obtain electrolyte resistance estimation,...
This contribution propose a design procedure applicable to many kinds of wireless or contactless energy transfer systems. The design procedure is limited to near field wireless energy transfer systems in resonant operation. Therefore it is well applicable to systems with a primary side power oscillator or systems with a control strategy that forces an equal system behavior compared to a primary side...
This paper presents a novel technique to verify and enforce passivity of sampled frequency response of rational-function based systems which may be realized as an equivalent circuit. The method detects the frequencies at which the system becomes non-passive and enforces passivity while minimizing the impact to the system's transfer function. The proposed technique is demonstrated on a numerical example...
This paper discusses an equivalent circuit to consider the frequency dependence of soil parameters. The paper describes a calculation method of the constants of the equivalent circuit. Calculated results using the equivalent circuit considering the constants agree well with experimental results. The equivalent circuit can consider the frequency dependence and the current dependence of grounding resistance...
Developing high-performance radar absorption material (RAM) is always important in the stealth projects. Circuit analog (CA) absorber studied in this thesis is better than traditional Jaumann absorber in many aspects, such as thickness and absorption band. The principle and design method of CA absorber is explored in this thesis. One sample of single-layer CA absorber is designed, and the simulation...
A printed circuit board (PCB) based electrically tunable absorber (ETA) providing good absorption rate at much higher frequencies than conventional ones is proposed. In conventional ETAs, the highest absorption frequency is mainly limited by very large capacitance of commercial varactors. In order to overcome the high-frequency limit, small parasitic capacitance is intentionally introduced by narrow...
Amorphous silicon carbide in various forms, thin films or bulk structures, is a longer period used in microelectronics, power electronics, sensors and mechanical engineering. Thin films of n-doped amorphous silicon carbide (a-SiC:H) in combination with crystalline silicon representing heterostructure for the solar cells were object of this study. DC and AC measurements and subsequent analyzes were...
Photovoltaic heterostructures composed of thin film of p-doped amorphous silicon carbide a-SiC and thin films of n-doped crystalline silicon prepared by PECVD deposition technique were the object of this study. Prepared structures have been subjected to accelerated aging process at 85 °C in dry air, respectively under the influence of the different degrees of humidity. The electrical measurements...
All batteries suffer from irreversible electrochemical changes as a result of their continuous operation. Deep depths of discharge and/or high discharge currents will inherently result in a reduction of performance over time. To track a battery lifetime, or state of health (SoH) requires an extension from the common internal resistance model and must be regularly assessed. To track SoH, an intelligent...
The evolution of battery management systems has imposed the necessity of evaluating batteries equivalent circuit models. The advantage of this type of modeling is to accurately estimate the dynamic aspects of a battery. Circuit parameters are identified for the purpose of forecasting different battery states. This paper presents multiple circuit models described in the literature. Four types of batteries...
The distance protection principle, when applied to over-head lines and cables, is well known, widely applied and well proven. Also on large generating blocks it is often applied as one of the back-up protection functions. When it comes to typical power transformers, the conventional distance protection however has some limitations which have limited its application in this context. Due to the increase...
For safety reasons, design specifications of automotive electronics, as compared to consumer electronics, are more stringent and complex. With increasing demand for high-end graphical displays in commercial vehicles, good power distribution network (PDN) design is critical to ensure the reliable operation of the circuits. This paper describes a systematic PDN design method of a high-speed printed...
We report on the use of catechol for the electrochemical activation of acid-functionalised single-walled carbon nanotubes immobilised on glassy carbon electrodes. Following well-published methods for catechol activation of bare glassy carbon electrodes, these studies show the efficacy of extending the method to activation of carbon nanotubes. Voltammetric scans in catechol show an increase in current...
This paper deals with deep bar effect in squirrel cage rotors. Induction machines using this type of rotor are widespread. Some cages enhance the deep bar effect to improve the starting performances. In cited references, the analytical calculation of the equivalent circuit parameters has only been investigated for single-cage and double-cage rotors. In this paper, an analytical model is developed...
Equivalent Circuit (EC) method gives a simple alternative method in Frequency Selective Surface (FSS) analyses which are useful for quickly predicting the characteristic of FSS. An impedance modeling of the Equivalent Circuit (EC) for a unit cell of the square loop FSS structure is presented in this paper. The unit cell of the square loop FSS is designed and simulated using the CST Microwave Studio...
A systematic algorithm for the lumped element equivalent circuit synthesis of admittance matrix of functions of complex frequency is presented. This work complements the previous work on impedance matrices by introduction of two new Brune's circuits (Type-III and Type-IV) and is also applicable to passive, reciprocal, lossy or lossless and symmetric or non-symmetric multi-port microwave circuits.
Modeling a photovoltaic source is a necessary operation in order to track the maximum power point of the solar panels for a specific condition. Generally, solar panels are modeled as nonlinear elements because of their nonlinear characteristics. Thus, maximum power point is tracked by numerical algorithms. As a different approach, this paper proposes an analytical maximum power point tracking (MPPT)...
Phthalate esters are known ubiquitous teratogenic and carcinogenic environmental and food pollutants. Their detection and quantification is strictly laboratory based, time consuming, expensive and professionally handled procedure. Presented research work describes a real time non-invasive detection technique for phthalates detection in ethanol, water and drinks. The new type of inter-digital sensor...
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