This page has only limited features, please log in for full access.

Unclaimed
M. Agop
Romanian Scientists Academy, 54 Splaiul Independentei, 050094 Bucharest, Romania

Basic Info

Basic Info is private.

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

The user biography is not available.
Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Journal article
Published: 07 June 2021 in Symmetry
Reads 0
Downloads 0

Two different operational procedures are proposed for evaluating and predicting the onset of epileptic and eclamptic seizures. The first procedure analyzes the electrical activity of the brain (EEG signals) using nonlinear dynamic methods (the time variations of the standard deviation, the variance, the skewness and the kurtosis; the evolution in time of the spatial–temporal entropy; the variations of the Lyapunov coefficients, etc.). The second operational procedure reconstructs any type of EEG signal through harmonic mappings from the usual space to the hyperbolic one using the time homographic invariance of a multifractal-type Schrödinger equation in the framework of the scale relativity theory (i.e., in a multifractal paradigm of motions). More precisely, the explicit differential descriptions of the brain activity in the form of 2 × 2 matrices with real elements disclose, through the in-phase coherences at various scale resolutions (i.e., as scale transitions), the multitude of brain neuronal dynamics, especially sequences of epileptic and eclamptic seizures. These two operational procedures are not mutually exclusive, but rather become complementary, offering valuable information concerning epileptic and eclamptic seizures. In such context, the prediction of epileptic and eclamptic seizures becomes fundamental for patients not responding to medical treatment and also presenting an increased rate of seizure recurrence.

ACS Style

Stefan Irimiciuc; Andrei Zala; Dan Dimitriu; Loredana Himiniuc; Maricel Agop; Bogdan Toma; Laura Gavril; Decebal Vasincu; Lucian Eva. Novel Approach for EEG Signal Analysis in a Multifractal Paradigm of Motions. Epileptic and Eclamptic Seizures as Scale Transitions. Symmetry 2021, 13, 1024 .

AMA Style

Stefan Irimiciuc, Andrei Zala, Dan Dimitriu, Loredana Himiniuc, Maricel Agop, Bogdan Toma, Laura Gavril, Decebal Vasincu, Lucian Eva. Novel Approach for EEG Signal Analysis in a Multifractal Paradigm of Motions. Epileptic and Eclamptic Seizures as Scale Transitions. Symmetry. 2021; 13 (6):1024.

Chicago/Turabian Style

Stefan Irimiciuc; Andrei Zala; Dan Dimitriu; Loredana Himiniuc; Maricel Agop; Bogdan Toma; Laura Gavril; Decebal Vasincu; Lucian Eva. 2021. "Novel Approach for EEG Signal Analysis in a Multifractal Paradigm of Motions. Epileptic and Eclamptic Seizures as Scale Transitions." Symmetry 13, no. 6: 1024.

Journal article
Published: 09 April 2021 in Entropy
Reads 0
Downloads 0

By assimilating biological systems, both structural and functional, into multifractal objects, their behavior can be described in the framework of the scale relativity theory, in any of its forms (standard form in Nottale’s sense and/or the form of the multifractal theory of motion). By operating in the context of the multifractal theory of motion, based on multifractalization through non-Markovian stochastic processes, the main results of Nottale’s theory can be generalized (specific momentum conservation laws, both at differentiable and non-differentiable resolution scales, specific momentum conservation law associated with the differentiable–non-differentiable scale transition, etc.). In such a context, all results are explicated through analyzing biological processes, such as acute arterial occlusions as scale transitions. Thus, we show through a biophysical multifractal model that the blocking of the lumen of a healthy artery can happen as a result of the “stopping effect” associated with the differentiable-non-differentiable scale transition. We consider that blood entities move on continuous but non-differentiable (multifractal) curves. We determine the biophysical parameters that characterize the blood flow as a Bingham-type rheological fluid through a normal arterial structure assimilated with a horizontal “pipe” with circular symmetry. Our model has been validated based on experimental clinical data.

ACS Style

Nicolae Tesloianu; Lucian Dobreci; Vlad Ghizdovat; Andrei Zala; Adrian Cotirlet; Alina Gavrilut; Maricel Agop; Decebal Vasincu; Igor Nedelciuc; Cristina Rusu; Irina Costache. Multifractality through Non-Markovian Stochastic Processes in the Scale Relativity Theory. Acute Arterial Occlusions as Scale Transitions. Entropy 2021, 23, 444 .

AMA Style

Nicolae Tesloianu, Lucian Dobreci, Vlad Ghizdovat, Andrei Zala, Adrian Cotirlet, Alina Gavrilut, Maricel Agop, Decebal Vasincu, Igor Nedelciuc, Cristina Rusu, Irina Costache. Multifractality through Non-Markovian Stochastic Processes in the Scale Relativity Theory. Acute Arterial Occlusions as Scale Transitions. Entropy. 2021; 23 (4):444.

Chicago/Turabian Style

Nicolae Tesloianu; Lucian Dobreci; Vlad Ghizdovat; Andrei Zala; Adrian Cotirlet; Alina Gavrilut; Maricel Agop; Decebal Vasincu; Igor Nedelciuc; Cristina Rusu; Irina Costache. 2021. "Multifractality through Non-Markovian Stochastic Processes in the Scale Relativity Theory. Acute Arterial Occlusions as Scale Transitions." Entropy 23, no. 4: 444.

Book chapter
Published: 17 June 2020 in Progress in Relativity
Reads 0
Downloads 0

A theory of space-time is built on a fractal/multifractal variety. Thus, considering that both the spatial coordinates and the time are fractal/multifractal, it is shown that both the energy and the non-differentiable mass of any biostructure depend on both the “state” of the biostructure and a speed limit of constant value. For the dynamics on Peano fractal/multifractal curves and Compton scale resolutions, it is shown that our results are reduced to those of Einstein relativity. In such a context, it has been shown that the “chameleon effect” of cholesterol corresponds to the HDL-LDL state transfer dictated by the spontaneous symmetry breaking through a fractal/multifractal tunnel effect. Then both HDL and LDL become distinct states of the same biostructure as in nuclear physics where proton and neutron are distinct states of the same nucleon.

ACS Style

Maricel Agop; Calin Buzea; Decebal Vasincu; Daniel Timofte. Dynamics of Biostructures on a Fractal/Multifractal Space-Time Manifold. Progress in Relativity 2020, 1 .

AMA Style

Maricel Agop, Calin Buzea, Decebal Vasincu, Daniel Timofte. Dynamics of Biostructures on a Fractal/Multifractal Space-Time Manifold. Progress in Relativity. 2020; ():1.

Chicago/Turabian Style

Maricel Agop; Calin Buzea; Decebal Vasincu; Daniel Timofte. 2020. "Dynamics of Biostructures on a Fractal/Multifractal Space-Time Manifold." Progress in Relativity , no. : 1.

Journal article
Published: 01 June 2020 in Polymers
Reads 0
Downloads 0

This paper reports the calibration of a theoretical multifractal model based on empirical data on the urea release from a series of soil conditioner systems. To do this, a series of formulations was prepared by in situ hydrogelation of chitosan with salicylaldehyde in the presence of different urea amounts. The formulations were morphologically characterized by scanning electron microscopy and polarized light microscopy. The in vitro urea release was investigated in an environmentally simulated medium. The release data were fitted on five different mathematical models, Korsmeyer–Peppas, Zero order, First order, Higuchi and Hixson–Crowell, which allowed the establishment of a mechanism of urea release. Furthermore, a multifractal model, used for the fertilizer release for the first time, was calibrated using these empirical data. The resulting fit was in good agreement with the experimental data, validating the multifractal theoretical model.

ACS Style

Manuela Maria Iftime; Stefan Andrei Irimiciuc; Maricel Agop; Marian Angheloiu; Lacramioara Ochiuz; Decebal Vasincu. A Theoretical Multifractal Model for Assessing Urea Release from Chitosan Based Formulations. Polymers 2020, 12, 1264 .

AMA Style

Manuela Maria Iftime, Stefan Andrei Irimiciuc, Maricel Agop, Marian Angheloiu, Lacramioara Ochiuz, Decebal Vasincu. A Theoretical Multifractal Model for Assessing Urea Release from Chitosan Based Formulations. Polymers. 2020; 12 (6):1264.

Chicago/Turabian Style

Manuela Maria Iftime; Stefan Andrei Irimiciuc; Maricel Agop; Marian Angheloiu; Lacramioara Ochiuz; Decebal Vasincu. 2020. "A Theoretical Multifractal Model for Assessing Urea Release from Chitosan Based Formulations." Polymers 12, no. 6: 1264.

Research article
Published: 31 May 2020 in Journal of Immunology Research
Reads 0
Downloads 0

The main aim of the paper was to simulate the drug release by a multifractal theoretical model, as a valuable method to assess the drug release mechanism. To do this, drug delivery films were prepared by mixing poly(vinyl alcohol boric acid) (PVAB) and diclofenac (DCF) sodium salt drug in different mass ratios from 90/10 to 70/30, in order to obtain drug delivery systems with different releasing rates. The different drug content of the three systems was confirmed by energy-dispersive spectroscopy (EDAX) analysis, and the encapsulation particularities were investigated by scanning electron microscopy (SEM), atomic force microscopy (AFM), and polarized optical microscopy (POM) techniques. The ability of the PVAB matrix to anchor the DCF was assessed by Fourier transform infrared (FTIR) spectroscopy. The in vitro release of the diclofenac sodium salt from the formulations was investigated in biomimetic conditions (pH=7.4 and 37°C) by UV-Vis spectroscopy, measuring the absorbance of the drug at 275 nm and fitting the results on a previously drawn calibration curve. An estimation of the drug release kinetics was performed by fitting three traditional mathematical models on experimental release data. Further, the drug delivery was simulated by the fractal theory of motion, in which the release dynamics of the polymer-drug complex system is described through various Riccati-type “regimes.” To explain such dynamics involved multifractal self-modulation in the form of period doubling, quasiperiodicity, intermittency, etc., as well as multifractal self-modulation of network type. Standard release dynamics were explained by multifractal behaviors of temporary kink type. The good correlation between the traditional mathematical models and the new proposed theoretical model demonstrated the validity of the multifractal model for the investigation of the drug release.

ACS Style

Daniela Ailincai; Alexandra Maria Dorobanțu; Bogdan Dima; Ștefan Andrei Irimiciuc; Cristian Lupașcu; Maricel Agop; Orzan Olguta. Poly(vinyl alcohol boric acid)-Diclofenac Sodium Salt Drug Delivery Systems: Experimental and Theoretical Studies. Journal of Immunology Research 2020, 2020, 1 -14.

AMA Style

Daniela Ailincai, Alexandra Maria Dorobanțu, Bogdan Dima, Ștefan Andrei Irimiciuc, Cristian Lupașcu, Maricel Agop, Orzan Olguta. Poly(vinyl alcohol boric acid)-Diclofenac Sodium Salt Drug Delivery Systems: Experimental and Theoretical Studies. Journal of Immunology Research. 2020; 2020 ():1-14.

Chicago/Turabian Style

Daniela Ailincai; Alexandra Maria Dorobanțu; Bogdan Dima; Ștefan Andrei Irimiciuc; Cristian Lupașcu; Maricel Agop; Orzan Olguta. 2020. "Poly(vinyl alcohol boric acid)-Diclofenac Sodium Salt Drug Delivery Systems: Experimental and Theoretical Studies." Journal of Immunology Research 2020, no. : 1-14.

Journal article
Published: 03 February 2020 in Symmetry
Reads 0
Downloads 0

In the motion fractal theory, the scale relativity dynamics of any complex system are described through various Schrödinger or hydrodynamic type fractal “regimes”. In the one dimensional stationary case of Schrödinger type fractal “regimes”, synchronizations of complex system entities implies a joint invariant function with the simultaneous action of two isomorphic groups of the SL(2R) type as solutions of Stoka type equations. Among these joint invariant functions, Gaussians become in the Jeans’s sense, probability density (i.e., stochasticity) whenever the information on the complex system analyzed is fragmentary. In the two-dimensional case of hydrodynamic type fractal “regimes” at a non-differentiable scale, the soliton and soliton-kink of fractal type of the velocity field generate the minimal vortex of fractal type that becomes the source of all turbulences in the complex systems dynamics. Some correlations of our model to experimental data were also achieved.

ACS Style

Maricel Agop; Mitică Craus. Towards Stochasticity through Joint Invariant Functions of Two Isomorphic Lie Algebras of SL(2R) Type. Symmetry 2020, 12, 226 .

AMA Style

Maricel Agop, Mitică Craus. Towards Stochasticity through Joint Invariant Functions of Two Isomorphic Lie Algebras of SL(2R) Type. Symmetry. 2020; 12 (2):226.

Chicago/Turabian Style

Maricel Agop; Mitică Craus. 2020. "Towards Stochasticity through Joint Invariant Functions of Two Isomorphic Lie Algebras of SL(2R) Type." Symmetry 12, no. 2: 226.

Journal article
Published: 09 January 2020 in Symmetry
Reads 0
Downloads 0

The optimization of the pulsed laser deposition process was attempted here for the generation of hydroxyapatite thin films. The deposition process was monitored with an ICCD (Intensified Coupled Charged Device) fast gated camera and a high-resolution spectrometer. The global dynamics of the laser produced plasma showed a self-structuring into three components with different composition and kinetics. The optical emission spectroscopy revealed the formation of a stoichiometric plasma and proved that the segregation in the kinetic energy of the plasma structure is also reflected by the individual energies of the ejected particles. Atomic Force Microscopy was also implemented to investigate the properties and the quality of the deposited film. The presence of micrometric clusters was seen at a high laser fluence deposition with in-situ ICCD imaging. We developed a fractal model based on Schrödinger type functionalities. The model can cover the distribution of the excited states in the laser produced plasma. Moreover, we proved that SL(2R) invariance can facilitate plasma substructures synchronization through a self-modulation in amplitude.

ACS Style

Maricel Agop; Nicanor Cimpoesu; Silviu Gurlui; Stefan Andrei Irimiciuc. Investigations of Transient Plasma Generated by Laser Ablation of Hydroxyapatite during the Pulsed Laser Deposition Process. Symmetry 2020, 12, 132 .

AMA Style

Maricel Agop, Nicanor Cimpoesu, Silviu Gurlui, Stefan Andrei Irimiciuc. Investigations of Transient Plasma Generated by Laser Ablation of Hydroxyapatite during the Pulsed Laser Deposition Process. Symmetry. 2020; 12 (1):132.

Chicago/Turabian Style

Maricel Agop; Nicanor Cimpoesu; Silviu Gurlui; Stefan Andrei Irimiciuc. 2020. "Investigations of Transient Plasma Generated by Laser Ablation of Hydroxyapatite during the Pulsed Laser Deposition Process." Symmetry 12, no. 1: 132.

Research article
Published: 06 January 2020 in Computational and Mathematical Methods in Medicine
Reads 0
Downloads 0

An increasing number of studies are beginning to show that both low-density lipoprotein and high-density lipoprotein cholesterol can constitute risk factors for myocardial infarction. Such a behaviour has been called by experts in the field the “chameleonic effect” of cholesterol. In the present paper, a fractal/multifractal model for low-density lipoprotein and high-density lipoprotein cholesterol dynamics is proposed. In such a context, a fractal/multifractal tunneling effect for systems with spontaneous symmetry breaking is analyzed so that if the spontaneous symmetry breaking is assimilated to an inflammation (in the form of a specific scalar potential), then a coupling between two fractal/multifractal states can be observed. These two states, which have been associated to biological structures such as low-density lipoprotein and high-density lipoprotein, transfer their states through a fractal/multifractal tunneling effect. Moreover, in our opinion, the widely used notions of “good” and “bad” cholesterol must be redefined as two different states (low-density lipoprotein and high-density lipoprotein) of the same biological structure named “cholesterol.” In our work, for the first time in the specialized literature, low-density lipoprotein and high-density lipoprotein have been regarded as two different states of the same biological structure (named “cholesterol”), such as in nuclear physics, the neutron and proton are two different states of the same particle named nucleon.

ACS Style

Nicolae Dan Tesloianu; Vlad Ghizdovat; Maricel Agop; Cristina Rusu; Anca Cardoneanu. On the Chameleonic Behaviour of Cholesterol through a Fractal/Multifractal Model. Computational and Mathematical Methods in Medicine 2020, 2020, 1 -11.

AMA Style

Nicolae Dan Tesloianu, Vlad Ghizdovat, Maricel Agop, Cristina Rusu, Anca Cardoneanu. On the Chameleonic Behaviour of Cholesterol through a Fractal/Multifractal Model. Computational and Mathematical Methods in Medicine. 2020; 2020 ():1-11.

Chicago/Turabian Style

Nicolae Dan Tesloianu; Vlad Ghizdovat; Maricel Agop; Cristina Rusu; Anca Cardoneanu. 2020. "On the Chameleonic Behaviour of Cholesterol through a Fractal/Multifractal Model." Computational and Mathematical Methods in Medicine 2020, no. : 1-11.

Research article
Published: 01 January 2020 in Drug Delivery
Reads 0
Downloads 0

The paper reports a new mathematical model for understanding the mechanism delivery from drug release systems. To do this, two drug release systems based on chitosan and diclofenac sodium salt as a drug model, were prepared by in situ hydrogelation in the presence of salicylaldehyde. The morphology of the systems was analyzed by scanning electron microscopy and polarized light microscopy and the drug release was in vitro investigated into a medium mimicking the in vivo environment. The drug release mechanism was firstly assessed by fitting the in vitro release data on five traditional mathematical model. In the context of pharmacokinetics behavioral analysis, a new mathematical procedure for describing drug release dynamics in polymer-drug complex systems was proposed. Assuming that the dynamics of polymer-drug system’s structural units take place on continuous and nondifferentiable curves (multifractal curves), it was showed that in a one-dimensional hydrodynamic formalism of multifractal variables the drug release mechanism is given through synchronous dynamics at a differentiable and non-differentiable scale resolutions.

ACS Style

Manuela Maria Iftime; Daniel Lucian Dobreci; Stefan Andrei Irimiciuc; Maricel Agop; Tudor Petrescu; Bogdan Doroftei. A theoretical mathematical model for assessing diclofenac release from chitosan-based formulations. Drug Delivery 2020, 27, 1125 -1133.

AMA Style

Manuela Maria Iftime, Daniel Lucian Dobreci, Stefan Andrei Irimiciuc, Maricel Agop, Tudor Petrescu, Bogdan Doroftei. A theoretical mathematical model for assessing diclofenac release from chitosan-based formulations. Drug Delivery. 2020; 27 (1):1125-1133.

Chicago/Turabian Style

Manuela Maria Iftime; Daniel Lucian Dobreci; Stefan Andrei Irimiciuc; Maricel Agop; Tudor Petrescu; Bogdan Doroftei. 2020. "A theoretical mathematical model for assessing diclofenac release from chitosan-based formulations." Drug Delivery 27, no. 1: 1125-1133.

Journal article
Published: 09 November 2019 in Symmetry
Reads 0
Downloads 0

Several surface investigation techniques, such as X-ray diffraction (XRD), EDX, and optical microscopy, were employed in order to describe the mineral contents in several geomaterials. Space and time resolved optical emission spectroscopy was implemented to analyze the plasma generated by the laser–geomaterial interaction. The values of the plasma parameters (velocity and temperature) were discussed with respect to the nature of the minerals composing the geomaterials and the morphological structure of the samples. Correlations were found between the excitation temperatures of the atomic and ionic species of the plasmas and the presence of calcite in the samples. A mathematical model was built to describe the dynamics in ablation plasma using various mathematical operational procedures: multi structuring of the ablation plasma by means of the fractal analysis and synchronizations of the ablation plasma entities through SL (2R) type group invariance and in a particular case, through self-modulation in the form of Stoler type transformations. Since Stoler type transformations are implied in general, in the charge creation and annihilation processes, then the SL (2R) type group invariance become fundamental in the description of ablation plasma dynamics.

ACS Style

Florin Enescu; Stefan Andrei Irimiciuc; Nicanor Cimpoesu; Horea Bedelean; Georgiana Bulai; Silviu Gurlui; Maricel Agop; Agop. Investigations of Laser Produced Plasmas Generated by Laser Ablation on Geomaterials. Experimental and Theoretical Aspects. Symmetry 2019, 11, 1391 .

AMA Style

Florin Enescu, Stefan Andrei Irimiciuc, Nicanor Cimpoesu, Horea Bedelean, Georgiana Bulai, Silviu Gurlui, Maricel Agop, Agop. Investigations of Laser Produced Plasmas Generated by Laser Ablation on Geomaterials. Experimental and Theoretical Aspects. Symmetry. 2019; 11 (11):1391.

Chicago/Turabian Style

Florin Enescu; Stefan Andrei Irimiciuc; Nicanor Cimpoesu; Horea Bedelean; Georgiana Bulai; Silviu Gurlui; Maricel Agop; Agop. 2019. "Investigations of Laser Produced Plasmas Generated by Laser Ablation on Geomaterials. Experimental and Theoretical Aspects." Symmetry 11, no. 11: 1391.

Chapter
Published: 02 November 2019 in Atomicity through Fractal Measure Theory
Reads 0
Downloads 0

In this chapter we continue the study began in Chap. 7 concerning continuity properties for set multifunctions taking values in all nonvoid subsets of a linear topological space. Based on these results, Egoroff and Lusin-type theorems are obtained and Lusin-type theorems are obtained for set of multifunctions in Vietoris topology.

ACS Style

Alina Gavriluţ; Ioan Mercheş; Maricel Agop. Approximation theorems for fuzzy set multifunctions in Vietoris topology: Physical implications of regularity. Atomicity through Fractal Measure Theory 2019, 105 -122.

AMA Style

Alina Gavriluţ, Ioan Mercheş, Maricel Agop. Approximation theorems for fuzzy set multifunctions in Vietoris topology: Physical implications of regularity. Atomicity through Fractal Measure Theory. 2019; ():105-122.

Chicago/Turabian Style

Alina Gavriluţ; Ioan Mercheş; Maricel Agop. 2019. "Approximation theorems for fuzzy set multifunctions in Vietoris topology: Physical implications of regularity." Atomicity through Fractal Measure Theory , no. : 105-122.

Research article
Published: 14 August 2019 in Computational and Mathematical Methods in Medicine
Reads 0
Downloads 0

Drug release is a complex phenomenon due to the large number of interdependent side effects that occur simultaneously, involving strong nonlinear dynamics. Therefore, since their theoretical description is difficult in the classical mathematics modelling, we have built a theoretical model based on logistic type laws, validated by the correlations with the experimental data, in a special case of drug release from hydrogels. The novelty of our approach is the implementation of multifractality in logistic type laws, situation in which any chaotic system, characterized by a small number of nonlinear interactions, gets memory and, implicitly, characterization through a large number of nonlinear interactions. In other words, the complex system polymer-drug matrix becomes “pseudo-intelligent.”

ACS Style

Anda-Mihaela Craciun; Mihaela Luminita Barhalescu; Maricel Agop; Lăcrămioara Ochiuz. Theoretical Modeling of Long-Time Drug Release from Nitrosalicyl-Imine-Chitosan Hydrogels through Multifractal Logistic Type Laws. Computational and Mathematical Methods in Medicine 2019, 2019, 1 -10.

AMA Style

Anda-Mihaela Craciun, Mihaela Luminita Barhalescu, Maricel Agop, Lăcrămioara Ochiuz. Theoretical Modeling of Long-Time Drug Release from Nitrosalicyl-Imine-Chitosan Hydrogels through Multifractal Logistic Type Laws. Computational and Mathematical Methods in Medicine. 2019; 2019 ():1-10.

Chicago/Turabian Style

Anda-Mihaela Craciun; Mihaela Luminita Barhalescu; Maricel Agop; Lăcrămioara Ochiuz. 2019. "Theoretical Modeling of Long-Time Drug Release from Nitrosalicyl-Imine-Chitosan Hydrogels through Multifractal Logistic Type Laws." Computational and Mathematical Methods in Medicine 2019, no. : 1-10.

Journal article
Published: 18 January 2019 in Atmosphere
Reads 0
Downloads 0

The article is aimed at presenting a semi-empirical model coded and computed in the programming language Python, which utilizes data gathered with a standard biaxial elastic lidar platform in order to calculate the altitude profiles of the structure coefficients of the atmospheric refraction index C N 2 ( z ) and other associated turbulence parameters. Additionally, the model can be used to calculate the PBL (Planetary Boundary Layer) height, and other parameters typically employed in the field of astronomy. Solving the Fernard–Klett inversion by correlating sun-photometer data obtained through our AERONET site with lidar data, it can yield the atmospheric extinction and backscatter profiles α ( z ) and β ( z ) , and thus obtain the atmospheric optical depth. Finally, several theoretical notions of interest that utilize the solved parameters are presented, such as approximated relations between C N 2 ( z ) and the atmospheric temperature profile T ( z ) , and between the scintillation of backscattered lidar signal and the average wind speed profile U ( z ) . These obtained profiles and parameters also have several environmental applications that are connected directly and indirectly to human health and well-being, ranging from understanding the transport of aerosols in the atmosphere and minimizing the errors in measuring it, to predicting extreme, and potentially-damaging, meteorological events.

ACS Style

Iulian-Alin Rosu; Marius-Mihai Cazacu; Otilia Sanda Prelipceanu; Maricel Agop. A Turbulence-Oriented Approach to Retrieve Various Atmospheric Parameters Using Advanced Lidar Data Processing Techniques. Atmosphere 2019, 10, 38 .

AMA Style

Iulian-Alin Rosu, Marius-Mihai Cazacu, Otilia Sanda Prelipceanu, Maricel Agop. A Turbulence-Oriented Approach to Retrieve Various Atmospheric Parameters Using Advanced Lidar Data Processing Techniques. Atmosphere. 2019; 10 (1):38.

Chicago/Turabian Style

Iulian-Alin Rosu; Marius-Mihai Cazacu; Otilia Sanda Prelipceanu; Maricel Agop. 2019. "A Turbulence-Oriented Approach to Retrieve Various Atmospheric Parameters Using Advanced Lidar Data Processing Techniques." Atmosphere 10, no. 1: 38.

Research article
Published: 10 January 2019 in Advances in Mathematical Physics
Reads 0
Downloads 0

The mathematical concept of minimal atomicity is extended to fractal minimal atomicity, based on the nondifferentiability of the motion curves of physical system entities on a fractal manifold. For this purpose, firstly, different results concerning minimal atomicity from the mathematical procedure of the Quantum Measure Theory and also several physical implications are obtained. Further, an inverse method with respect to the common developments concerning the minimal atomicity concept has been used, showing that Quantum Mechanics is identified as a particular case of Fractal Mechanics at a given scale resolution. More precisely, for fractality through Markov type stochastic processes, i.e., fractalization through stochasticization, the standard Schrödinger equation is identified with the geodesics of a fractal space for motions of the physical system entities on nondifferentiable curves on fractal dimension two at Compton scale resolution. In the one-dimensional stationary case of the fractal Schrödinger type geodesics, a special symmetry induced by the homographic group in Barbilian’s form “makes possible the synchronicity” of all entities of a given physical system. The integral and differential properties of this group under the restriction of defining a parallelism of directions in Levi-Civita’s sense impose correspondences with the “dynamics” of the hyperbolic plane so that harmonic mappings between the ordinary flat space and the hyperbolic one generate (by means of a variational principle) a priori probabilities in Jaynes’ sense. The explicitation of such situation specifies the fact that the hydrodynamical variant of a Fractal Mechanics is more easily approached and, from this, the fact that Quantum Measure Theory can be a particular case of a possible Fractal Measure Theory.

ACS Style

Gabriel Gavriluţ; Alina Gavriluţ; Maricel Agop. Extended Minimal Atomicity through Nondifferentiability: A Mathematical-Physical Approach. Advances in Mathematical Physics 2019, 2019, 1 -16.

AMA Style

Gabriel Gavriluţ, Alina Gavriluţ, Maricel Agop. Extended Minimal Atomicity through Nondifferentiability: A Mathematical-Physical Approach. Advances in Mathematical Physics. 2019; 2019 ():1-16.

Chicago/Turabian Style

Gabriel Gavriluţ; Alina Gavriluţ; Maricel Agop. 2019. "Extended Minimal Atomicity through Nondifferentiability: A Mathematical-Physical Approach." Advances in Mathematical Physics 2019, no. : 1-16.

Chapter
Published: 12 December 2018 in Fractional Dynamics, Anomalous Transport and Plasma Science
Reads 0
Downloads 0

Since the non-differentiability becomes a fundamental property of the motions space [1, 2, 3, 4], a correspondence between the interaction processes and multifractality of the motion trajectories can be established. Then, for all scale resolutions, the geodesics equations (in the form of the Schrödinger equation of fractal type) and some applications (similarities between dynamics at atomic and cosmic scales) are obtained.

ACS Style

Maricel Agop; Alina Gavriluţ; Gabriel Crumpei. Similarities Between Dynamics at Atomic and Cosmological Scales. Fractional Dynamics, Anomalous Transport and Plasma Science 2018, 155 -179.

AMA Style

Maricel Agop, Alina Gavriluţ, Gabriel Crumpei. Similarities Between Dynamics at Atomic and Cosmological Scales. Fractional Dynamics, Anomalous Transport and Plasma Science. 2018; ():155-179.

Chicago/Turabian Style

Maricel Agop; Alina Gavriluţ; Gabriel Crumpei. 2018. "Similarities Between Dynamics at Atomic and Cosmological Scales." Fractional Dynamics, Anomalous Transport and Plasma Science , no. : 155-179.

Article
Published: 16 August 2018 in Applied Physics A
Reads 0
Downloads 0

The formation and dynamics of Al and Ag–Ni–Fe plasmas were studied through ICCD imaging and space- and time-resolved optical emission spectroscopy techniques. The experiments were conducted in pulsed laser deposition configuration and the surface topography and chemical composition of the obtained thin films were analyzed. For both targets, a splitting of the plasma plume was observed. Two structures with distinct velocities were analyzed and associated with different types of species: the ions were found predominantly in the fast structure while the excited species were observed mainly in the slow structure. Their different velocities were correlated to the different ejection mechanisms which lead to plasma formation. The angular distributions of the plasma front velocity were analyzed and associated with the mass of the main elements found in the plume. The excitation temperature determined for excited species presented a more uniform distribution than the one calculated for ions using the Boltzmann plot. The experimental results were described by a non-differential theoretical model which took into account the scattering probability, collision frequency and the fractality of the plasmas.

ACS Style

S. Irimiciuc; G. Bulai; M. Agop; S. Gurlui. Influence of laser-produced plasma parameters on the deposition process: in situ space- and time-resolved optical emission spectroscopy and fractal modeling approach. Applied Physics A 2018, 124, 615 .

AMA Style

S. Irimiciuc, G. Bulai, M. Agop, S. Gurlui. Influence of laser-produced plasma parameters on the deposition process: in situ space- and time-resolved optical emission spectroscopy and fractal modeling approach. Applied Physics A. 2018; 124 (9):615.

Chicago/Turabian Style

S. Irimiciuc; G. Bulai; M. Agop; S. Gurlui. 2018. "Influence of laser-produced plasma parameters on the deposition process: in situ space- and time-resolved optical emission spectroscopy and fractal modeling approach." Applied Physics A 124, no. 9: 615.

Research article
Published: 12 August 2018 in Complexity
Reads 0
Downloads 0

Carbon plasmas generated by excimer laser ablation are often applied for deposition (in vacuum or under controlled atmosphere) of high-technological interest nanostructures and thin films. For specific excimer irradiation conditions, these transient plasmas can exhibit peculiar behaviors when probed by fast time- and space-resolved optical and electrical methods. We propose here a fractal approach to simulate this peculiar dynamics. In our model, the complexity of the interactions between the transient plasma particles (in the Euclidean space) is substituted by the nondifferentiability (fractality) of the motion curves of the same particles, but in a fractal space. For plane symmetry and particular boundary conditions, stationary geodesic equations at a fractal scale resolution give a fractal velocity field with components expressed by means of nonlinear solutions (soliton type, kink type, etc.). The theoretical model successfully reproduces the (surprising) formation of V-like radiating plasma structures (consisting of two lateral arms of high optical emissivity and a fast-expanding central part of low emissivity) experimentally observed.

ACS Style

Cristian Ursu; P. Nica; Cristian Focsa; M. Agop. Fractal Method for Modeling the Peculiar Dynamics of Transient Carbon Plasma Generated by Excimer Laser Ablation in Vacuum. Complexity 2018, 2018, 1 -8.

AMA Style

Cristian Ursu, P. Nica, Cristian Focsa, M. Agop. Fractal Method for Modeling the Peculiar Dynamics of Transient Carbon Plasma Generated by Excimer Laser Ablation in Vacuum. Complexity. 2018; 2018 ():1-8.

Chicago/Turabian Style

Cristian Ursu; P. Nica; Cristian Focsa; M. Agop. 2018. "Fractal Method for Modeling the Peculiar Dynamics of Transient Carbon Plasma Generated by Excimer Laser Ablation in Vacuum." Complexity 2018, no. : 1-8.

Journal article
Published: 07 August 2018 in Sustainability
Reads 0
Downloads 0

The issue of drug disposal, as well as the development and implementation of efficient collection strategies, represents an important concern at the highest European level. This research looks into the factors that could have an impact on the efficiency of pharmacies in collecting and disposing the medicinal waste of the population. There were 521 pharmacists from all over the country who filled in a questionnaire on their opinion/attitude related to the system of collecting and disposing the pharmaceutical waste of the population. Of the surveyed pharmacists, 16% work in pharmacies that do not collect unused/expired drugs from the population, and nearly 33% of those investigated have refused, at least once, to take the unused medicines from the people. Pharmacists’ most important reasons for refusing to collect the pharmaceutical waste were the lack of procedure, incomplete legislation, exceeding the amount contracted with the operators, and high costs. Results show that pharmacies in Romania face several deficiencies in the pharmaceutical waste collection services. The lack of implemented programs has contributed considerably to lower standards of pharmaceutical waste management in Romania. This study is the first research on this topic in Romania, a country where the management of drug-based waste generated by the population is at the beginning. The results shown in this survey can provide a reference point for competent authorities in developing and implementing a take-back program for waste medicine whose efficiency is superior to the existing ones.

ACS Style

Simona Bungau; Delia Tit; Katalin Fodor; Gabriela Cioca; Maricel Agop; Ciprian Iovan; Delia Cseppento; Adrian Bumbu; Cristiana Bustea. Aspects Regarding the Pharmaceutical Waste Management in Romania. Sustainability 2018, 10, 2788 .

AMA Style

Simona Bungau, Delia Tit, Katalin Fodor, Gabriela Cioca, Maricel Agop, Ciprian Iovan, Delia Cseppento, Adrian Bumbu, Cristiana Bustea. Aspects Regarding the Pharmaceutical Waste Management in Romania. Sustainability. 2018; 10 (8):2788.

Chicago/Turabian Style

Simona Bungau; Delia Tit; Katalin Fodor; Gabriela Cioca; Maricel Agop; Ciprian Iovan; Delia Cseppento; Adrian Bumbu; Cristiana Bustea. 2018. "Aspects Regarding the Pharmaceutical Waste Management in Romania." Sustainability 10, no. 8: 2788.

Book chapter
Published: 18 July 2018 in Nonlinear Systems - Modeling, Estimation, and Stability
Reads 0
Downloads 0
ACS Style

Emil Anton; Anna Gavrilut; Maricel Agop; Daniel Timofte. Non-Linear Behaviours in the Dynamics of Some Biostructures. Nonlinear Systems - Modeling, Estimation, and Stability 2018, 1 .

AMA Style

Emil Anton, Anna Gavrilut, Maricel Agop, Daniel Timofte. Non-Linear Behaviours in the Dynamics of Some Biostructures. Nonlinear Systems - Modeling, Estimation, and Stability. 2018; ():1.

Chicago/Turabian Style

Emil Anton; Anna Gavrilut; Maricel Agop; Daniel Timofte. 2018. "Non-Linear Behaviours in the Dynamics of Some Biostructures." Nonlinear Systems - Modeling, Estimation, and Stability , no. : 1.

Journal article
Published: 01 July 2018 in International Journal of Non-Linear Mechanics
Reads 0
Downloads 0

In the materials area there are many theoretical and experimental investigations concerning their sound absorption behaviour, covering a wide range of applications. An alternative approach consists in identifying the ensemble acoustic field - propagation environment with a fractal gives its functionality in the form of structure parameters that is dependent on scale resolution. These fractal parameters can be matched with “classical” ones typical for sound absorption experiments in various materials. The mathematical methodology presented here implies the substitution of a dynamics with constraints on continuous but differentiable curves, in an Euclidian space, with “synchronous” dynamics, free from any constraints, on continuous but non-differentiable curves with various fractal dimensions but on a fractal space (i.e. the geodesics of that space). In a very special representation, the external constraints select the fractal geodesics type. In our study this “type selection” refers to the geodesics tunnel effect of fractal (acoustic) type for which we calculate the reflectance and the transparency of an external fractal barrier. An experimental procedure, using a modified impedance tube technique, to determine the sound absorption coefficients for various composite materials was conducted. The procedure uses an anechoic room and the measured sound absorption coefficients also include the sound transmission. The fractal approach of the acoustic behaviour, through the fractal parameters determined (transparency and reflectance) matched the experimental results, in terms of sound absorption, emphasizing the high degree of generality of the fractal theory in the dynamics of physical processes.

ACS Style

Carmen Bujoreanu; Ştefan Irimiciuc; Marcelin Benchea; Florin Nedeff; Maricel Agop. A fractal approach of the sound absorption behaviour of materials. Theoretical and experimental aspects. International Journal of Non-Linear Mechanics 2018, 103, 128 -137.

AMA Style

Carmen Bujoreanu, Ştefan Irimiciuc, Marcelin Benchea, Florin Nedeff, Maricel Agop. A fractal approach of the sound absorption behaviour of materials. Theoretical and experimental aspects. International Journal of Non-Linear Mechanics. 2018; 103 ():128-137.

Chicago/Turabian Style

Carmen Bujoreanu; Ştefan Irimiciuc; Marcelin Benchea; Florin Nedeff; Maricel Agop. 2018. "A fractal approach of the sound absorption behaviour of materials. Theoretical and experimental aspects." International Journal of Non-Linear Mechanics 103, no. : 128-137.