<abstract xmlns="http://www.w3.org/1999/xhtml"> In most of the applications involving neural networks, the main problem consists in finding an optimal procedure to reduce the real neuron to simpler models which still express the biological complexity but allow highlighting the main characteristics of the system. We effectively investigate a simple reduction procedure which leads from complex models of Hodgkin-Huxley type to very convenient binary models of Hopfield type. The reduction will allow to describe the neuron interconnections in a quite large network and to obtain information concerning its symmetry and stability. Both cases, on homogeneous voltage across the membrane and inhomogeneous voltage along the axon will be tackled out. Few numerical simulations of the neural flow based on the cable-equation will be also presented.</abstract>

Neural Flows in Hopfield Network Approach

<abstract xmlns="http://www.w3.org/1999/xhtml"> The paper deals with the problem of decreasing level of knowledge of university students due to the changes of the school system in Slovakia. As the commonly repeated words connected with education in 21st.century are key competencies, we tried to look at the problems and challenges in teaching physics from this point of view. The role of classical experiments in our computerized world is also discussed.</abstract>

Problems in Teaching Physics at Technical Universities

<abstract xmlns="http://www.w3.org/1999/xhtml"> The paper presents a comparative analysis between the surface global irradiation measured for Romania and the predicted irradiation obtained by numerical simulation. The measured data came from the Romanian National meteorological Administration. Based on a preliminary analysis that took into account several criteria among which, performance, cost, popularity and meteorological and satellite data accessibility we concluded that a combination GFS-WRF(NMM) or GFS-WRF(ARW) is most suitable for short term global solar irradiation forecasting in order to assess the performance of the photovoltaic power stations (Badescu and Dumitrescu, 2012, [1], Martin et al., 2011, [2]).</abstract>

Dept. of Aerospace Sciences "Elie Carafoli", Univ. Politehnica of Bucharest, Str. Gh. Polizu 1 , 011061, Bucharest, ROMANIA

Candida Oancea Institute, Univ. Politehnica of Bucharest, Spl. Independentei 313, 060042 Bucharest, ROMANIA

Comparison Between Measurements and WRF Numerical Simulation of Global Solar Irradiation in Romania

<abstract xmlns="http://www.w3.org/1999/xhtml"> Pulsed laser irradiated vanadium surface morphology under different ambient has been prepared and characterized using fractal dimension analysis method on scanning electron microscopy (SEM) images. In presence of different ambient, self-periodic and self-similar surface patterns (e.g. dots, islands, and pins) were grown and appeared in different shapes. The fractal dimension (FD) of this developed vanadium nanostructure was calculated by fractal box count method (FBM). The calculated fractal dimension (FD, Df) shows dependence on the different type on ambient and the number of laser shots.</abstract>

Department of Experimental Physics, University of Szeged

Faculty of Physics, West University of Timisoara

Department of General and Environmental Physics, University of Szeged

Fractal Analysis on Morphology of Laser Irradiated Vanadium Surfaces Under Different Ambient

<abstract xmlns="http://www.w3.org/1999/xhtml"> The paper reports on the presence of various metals in soil in Timis county. A set of 18 samples were collected from different points of interest. The metal content of the samples was investigated using a handheld XRF Niton XLp 300 GOLDD analyzer. Special attention was paid to the metals with harmful potential to humans. Based on the obtained results, a set of conclusions on the environment’s health was drawn.</abstract>

Analysis of Metal Content in Soil in Timis County

<abstract xmlns="http://www.w3.org/1999/xhtml"> In this paper we discuss interplays between the Aharonov-Bohm effect and the transport properties in mesoscopic ring structures based on graphene. The interlayer interaction leads to a change of the electronic structure of bilayer graphene ring such that the electronic energy dispersion law exhibits a gap, either by doping one of the layers or by the application of an external perpendicular electric field. Gap adjustments can be done by varying the external electric field, which provides the possibility of obtaining mesoscopic devices based on the electronic properties of bilayer graphene. This opens the way to controllable manipulations of phase-coherent mesoscopic phenomena, as well as to Aharonov-Bohm oscillations depending on the height of the potential step and on the radius of the ring. For this purpose one resorts to a tight-binding model such as used to the description of conductance.</abstract>

The Aharonov-Bohm Effect and Transport Properties in Graphene Nanostructures

<abstract xmlns="http://www.w3.org/1999/xhtml"> Intercomparison exercises of radon instruments play an important part when it comes to domestic survey as well as international or national mapping in dwellings, soil or water. Therefore, it is of prime interest to improve and standardize technical methods of measurement and also to verify quality assurance through comparison between different instruments and techniques. In the present paper is described the latest intercomparison exercise performed between the Laboratory of Environmental Radioactivity (hereafter called LER) of our department and other 15 different teams around Europe. The test has been held at two radon reference sites located 60 km SW of Prague, Czech Republic.</abstract>

Intercomparison of Radon in Soil Instruments at Reference Site in Czech Republic

<abstract xmlns="http://www.w3.org/1999/xhtml"> The information-theoretical entropy, also called the “classical” entropy, was introduced by Wehrl in terms of the Glauber coherent states (CSs) | z > , i.e. the CSs corresponding to the one-dimensional harmonic oscillator (HO-1D). In the present paper, we have focused our attention on the examination of the information-theoretical entropy, i.e. the Wehrl entropy, for both the pure and the mixed (thermal) states of some quantum oscillators. </abstract>

“Politehnica” University of Timişoara, Department of Physical Foundation of Engineering, Vasile Pârvan Blvd., 300223 Timisoara, Romania

“Politehnica” University of Timişoara, Faculty of Communication Sciences, 2A Traian Lalescu St, 300223 Timişoara, Romania

On The Information-Theoretical Entropy for Some Quantum Oscillators

<abstract xmlns="http://www.w3.org/1999/xhtml"> In this paper it is present a non contact method for 3D measurements on parabolic surface antenna. In order to obtain modal parameters and modal shapes of a parabolic surface antenna a Microflown USP (Ultimate Sound Probe) is used. Microflown sensors are close to antenna and can be used for the non contact measurement of the normal component of the structural velocity.</abstract>

Non Contact Vibration Measurements on Parabolic Surface Antenna

<abstract xmlns="http://www.w3.org/1999/xhtml"> This paper investigates the possibility to improve the filtering process of flue gas by separation of suspended nanoparticle using dielectrophoresis. The study focuses on the particles having an average radius of about 50-150 nm, that cannot be filtrated by classical techniques but have a harmful effect for environment and human health. The size distribution nanoparticles collected from the flue gas filters of a hazardous waste incinerator plant were evaluated. Based on obtained experimental data and a proposed mathematical model, the concentration distribution of nanoparticle suspended in flue gas inside a microfluidic separation device was analyzed by numerical simulations, using the finite element method. The performances of the device were described in terms of three new specific quantities related to the separation process, namely Recovery, Purity and Separation Efficiency. The simulations could provide the optimal values of control parameters for separation process, and aim to be a useful tool in designing microfluidic devices for separating nanoparticle from combustion gases. </abstract>

<abstract xmlns="http://www.w3.org/1999/xhtml"> This paper is focused on improving the quality of nowcasting solar irradiance by enhancing the clear sky component of the model. A simple linear correction for the average atmospheric transmittance is proposed. The correction is based on the most recent measurements recorded prior the forecasting moment. The proposed procedure was tested against data measured on the Solar Platform of the West University of Timisoara. Overall results demonstrates a notable improvement in the clear sky model accuracy.</abstract>

Improving The Accuracy of the Empirical Clear Sky Solar Irradiance Models

AHEAD OF PRINT

Volume 65 (2023): Issue 1 (December 2023)

Volume 64 (2022): Issue 1 (December 2022)

Volume 63 (2021): Issue 1 (December 2021)

Volume 62 (2020): Issue 1 (December 2020)

Volume 61 (2019): Issue 1 (December 2019)

Volume 60 (2018): Issue 1 (August 2018)

Volume 59 (2016): Issue 1 (December 2016)

Volume 58 (2015): Issue 1 (December 2015)

Volume 57 (2013): Issue 1 (December 2013)

Volume 56 (2012): Issue 1 (December 2012)

Annals of West University of Timisoara - Physics

 The first issue of the Annals of the West University of Timisoara, was published in 1963 under the name of Mathematical and Physical Sciences Series, and it was issued on yearly basis ever since. Since 2002 the journal is being published in a new graphical format, as the Annals of the West University of Timisoara, Physics Series. The journal welcomes manuscripts presenting information not previously published in journals, in the areas of Materials Science, Theoretical and Computational Physics, Applied Physics, Medical Physics. The submitted manuscripts are peer-reviewed, insuring a high standard of scientific quality to the accepted articles.  Why subscribe and read  The journal publishes current and original research results in the fields of Materials Science, Theoretical and Computational Physics, Applied Physics, Medical Physics.  Why submit   Fast review and publication process  Fast and constructive peer review   Archiving  Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy  The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process. 

Annals of West University of Timisoara - Physics

Volume 57 (2013): Issue 1 (December 2013)

Neural Flows in Hopfield Network Approach

Problems in Teaching Physics at Technical Universities

Comparison Between Measurements and WRF Numerical Simulation of Global Solar Irradiation in Romania

Fractal Analysis on Morphology of Laser Irradiated Vanadium Surfaces Under Different Ambient

Analysis of Metal Content in Soil in Timis County

The Aharonov-Bohm Effect and Transport Properties in Graphene Nanostructures

Intercomparison of Radon in Soil Instruments at Reference Site in Czech Republic

On The Information-Theoretical Entropy for Some Quantum Oscillators

Non Contact Vibration Measurements on Parabolic Surface Antenna

The Aharonov-Bohm Effect and Transport Properties in Graphene Nanostructures

Improving The Accuracy of the Empirical Clear Sky Solar Irradiance Models

Cerca

Tutti i volumi ed i numeri in questa rivista