Mihaela Osaci

• PhD
• Associate Professor at Polytechnic University of Timişoara

Recent extensive research has focused on atmospheric aerosol systems, driven by their far-reaching implications for climate and public health, with a goal to identify optimal air quality management practices. This study employs Langevin dynamics to investigate the impact of size distribution and concentration of submicrometer solid aerosol particle...

In this paper, the functionality of MOS and IGBT transistors is examined under identical working conditions, both in terms of command frequency and load circuit. A variable duty cycle and variable frequency signal generator is used to control transistors. Various electronic components and Arduino-UNO modules, as well as the 16×2 LCD screen, were us...

Magnetic nanofluids find application in various fields, including magnetic hyperthermia, which holds significant potential for non-invasive cancer treatment. The dynamics of magnetic nanoparticle systems under the influence of a magnetic field plays a crucial role in all applications, particularly in magnetic hyperthermia, and has been the subject...

Magnetic nanofluids are used in many types of applications. Therefore, the dynamics of magnetic nanoparticle systems under the action of magnetic field were intensively studied, lately. Many studies related to biomedical applications consider the Brownian relaxation time independent from the magnetic field and nanoparticle concentration. This model...

The current magnetic hyperthermia with nanoparticles is a method of destroying cancer cells, increasingly studied theoretically and experimentally. The colloidal magnetic nanoparticle systems used in this method have a pronounced agglomeration tendency that leads to the blocking of blood vessels in the case of intravenous administration of the nano...

In magnetic hyperthermia, the effectiveness for tumour cell destruction is measured by the specific loss power. Theoretically, within the medically accepted ranges for the amplitude and frequency of the applied magnetic field, if energy losses in nanofluids occur through magnetic relaxation processes, the specific loss power is calculated based on...

Colloidal systems consisting of monodomain superparamagnetic nanoparticles have been used in biomedical applications, such as the hyperthermia treatment for cancer. In this type of colloid, called a nanofluid, the nanoparticles tend to agglomeration. It has been shown experimentally that the nanoparticle coating plays an important role in the nanop...

This paper presents a way to improve physical experiments at the engineering university level using a graphical programming environment for data acquisition. As a case study it is presented the experimental verification of the law of the magnetic circuit. Such a working method for experimentation opens the way for the future engineer to study physi...

Currently, the colloidal systems of monodomain superparamagnetic nanoparticles are used in biomedical applications, such as hyperthermia treatment for cancer. In this type of colloid, called nanofluid, there is a tendency of nanoparticle agglomeration. It has been shown experimentally that the nanoparticle coating plays an important role in the nan...

The aim of the risk assessment is to help you decide what you need to do to ensure the health and safety of your employees who are exposed to noise. It is more than just taking measurements of noise-sometimes measurements may not even be necessary. Noise at work can cause hearing loss or damage that is permanent and disabling. Hearing loss can also...

Currently, the implementation of the integrated information systems in companies represents a sine qua non condition for providing higher and more reliable accessibility to the information resources. One of the most used integrated platform, which offer the support for ERP (Enterprise Resources Planning, is SAP Netweaver. This platform is multil...

Adopting the most appropriate technology for developing applications on an integrated software system for enterprises, may result in great savings both in cost and hours of work. This paper proposes a research study for the determination of a hierarchy between three SAP (System Applications and Products in Data Processing) technologies. The technol...

This paper presents a modelling study about the nanoparticle agglomeration in magnetic nanofluids. The colloidal magnetic nanoparticles size distribution is subjected to simultaneous translation and rotation movements under the action of conservative and dissipative forces, with their respective moments. In order to obtain the numerical solution of...

Currently, the magnetic hyperthermia induced by nanoparticles is of great interest in biomedical applications. In the literature, we can find a lot of models for magnetic hyperthermia, but many of them do not give importance to a significant detail, such as the geometry of nanoparticle positions in the system. Usually, a nanofluid is treated by con...

Background: This paper presents a series of theoretical studies about the influence of the size distribution and the effective magnetic anisotropy constants on the Néel relaxation time, the effective relaxation time and the Specific Loss Power of a magnetic nanoparticle system. Methods: We modelled the system by considering the dipolar magnetic int...

The monodomain magnetic nanoparticle-based colloids are mainly used in biomedical applications. In this type of colloids, there is a tendency of agglomeration even in the absence of external magnetic field. So, the Néel magnetic relaxation time of the system is affected by that tendency. In this paper, we propose a model to study how the nanopartic...

In nanomagnetism, the studies of magnetic nanoparticle systems are of particular interest from both experimental and theoretical points of view. Experimentally, the measurements made on such a system are hard to interpret. It is very difficult to distinguish the effect of the magnetic dipole interactions from the effects of size distribution or eff...

In recent years, the study of magnetic nanoparticles has been intensively developed not only for their fundamental theoretical interest, but also for their many technological applications, especially biomedical applications, ranging from contrast agents for magnetic resonance imaging to the deterioration of cancer cells via hyperthermia treatment....

The paper presents a monitoring solution for flow measurement through Web Dynpro ABAP interface. The use of integrated software systems in companies currently represents an essential condition for providing higher and more reliable access to information resources. The SAP Netweaver, a multilingual & multitasking system based on the three-tier clien...

Background: Nanoparticles can be used in biomedical applications, such as contrast agents for magnetic resonance imaging, in tumor therapy or against cardiovascular diseases. Single-domain nanoparticles dissipate heat through susceptibility losses in two modes: Néel relaxation and Brownian relaxation. Results: Since a consistent theory for the N...

This paper presents a series of studies about the modality in which the attempt frequency influences the Neel relaxation time and thus the effective relaxation time, in a spherical-nanoparticle-saturated nanofluid in external magnetic field. The nanoparticles have a random distribution, and their magnetic moments have a magnetic dipole-dipole inter...

The FPGA (Field Programmable Gate Array) circuits contain programmable logic components and are increasingly popular in implementing the applications for obtaining and processing signals. FPGA represents a modern development trend in digital electronics. The integration in the work with students of this trend is a difficult task, but also useful, b...

The paper analyses the operation of a single phase – three phase frequency converter, built with insulated-gate bipolar transistors (IGBT). The bridge inverter control is made via the Basys 2 development board which generates voltages, at the output terminals, compatible with the logic levels of complementary metal–oxide–semiconductor (CMOS) circui...

The functional analysis of electric scheme including an AC electric arc involves the use of techniques of modeling the electric arc that should reflect as closely as possible the behavior of the real electric arc. This can be done by means of general programs for non-linear circuits, or programs that are specific for a more restricted domain. In th...

This paper presents a study about the possibility to switch a magnetic dense nanoparticle system from a superparamagnetic state to an ordered state, called superferromagnetism. We start from the idea that the magnetic state of the system is influenced not only by the magnetic interactions between the nanoparticles, but also by the distribution of t...

The selection of a web technology in realizing a project is a complex and important decision for small and medium enterprises. The purpose of this paper is to develop an efficient model, using the AHP (Analytic Hierarchy Process) method as a basis and applying the SuperDecisions software, which makes it possible to evaluate the performance of web a...

Currently, the implementation of the integrated information systems in companies represents a sine qua non condition for providing higher and more reliable accessibility to the information resources. One of the most used integrated platform is SAP Netweaver, a multilingual & multitasking system based on the three-tier client-server technology. The...

Web Dynpro technology is the present-day standard to develop Web applications in ABAP (or Java) programming SAP environment. The paper presents a didactic application of unitary presentation of some functions for the ABAP List Viewer (ALV) component SALV_WD_TABLE that represents a strong and flexible tool to present data on Web pages in table struc...

The aim of this paper is to analyze a web application implemented in three SAP UI technologies: Web Dynpro ABAP, Floorplan Manager and CRM Web Client UI. This case study is realized for the alternatives: incomplete query, complete query with 9 displays rows and complete query with 100 displayed rows on the DB tables of the applications. The analyze...

To face the challenges of the modern competitive business environment, the best companies ensure transparency in all the aspects of their work, enabling them to react quickly, with high quality information, efficiency, and flexibility. With the help of the SAP NetWeaver technological and integration platform, the software applications enable the co...

This paper proposes a comparative study for the web business applications realised on the NetWeaver platform of the integrated system SAP(System Application Products in Data Processing). The underlying level of this platform is the application level and contains an ABAP (Advanced Business Application Language) server for achieving web business appl...

This paper analyzes, by case study, the similarities and differences between two existing componentisation techniques of a project in Web Dynpro ABAP: the faceless componentisation and assistance class componentisation, made possible due to the MVC architecture (Model-View-Controller), which are the basis of the Web Dynpro ABAP framework. We highli...

This paper proposes a case study about a web business application implemented in three SAP (System Application and Products in Data Processing) UI (user interfaces) technologies: Web Dynpro (WD) ABAP (Advanced Business Application Programming), Floorplan Manager (FPM) and Customer Relationship Management (CRM) WebClient UI. This study is comparativ...

The goal of this paper is to present a comparative study on some web UI (User Interface) technologies that involve the creation of web applications on the platform SAP Net Weaver AS 7.01 of the integrated SAP (System Application Products) system. The attention will be directed mainly to the ABAP (Advanced Business Application Programing) developmen...

Nowadays the Internet plays an important role in a promotion campaign. Valorising some products and services through the Internet may be performed by choosing an appropriate Web technology. Due to the fact that in many small and middle-sized enterprises ERP (Entreprise Resources Planning) systems SAP integrated are implemented, we have been preoccu...

This work is presenting a study performed towards the web programming on integrated system, emphasizing the facilities offered by the SAP integrated system's environment. Because the architecture of the SAP NetWeaver Application Server system is a three-tier architecture, it's possible to develop web business applications of ABAP (Advanced Business...

This article presents an easy study technique, based on a complex and modern informational technology, the Web programming on integrated systems, in particular Web Dynpro Java. The project developed for this learning technique is realised in Mind Map and combines an assembly of utilities, from the transparent presentation of complex concepts to com...

The integrated platform SAP Netweaver is a platform that offers support in realizing Web bussiness applications that use the Model View Controller (MVC) concept. The Multilinguality being a property of this platform. The purpose of this article is to highlight the modality to internationalize a Web Dynpro ABAP project The techniquesused for the int...

The magnetic materials studied most by current international projects are based on ultrafine particles, in solid or liquid matrix. In order to design a good magnetic material based on nanoparticles, it is required to know their magnetic properties. Magnetic measurements represent a relatively difficult area of electrical engineering. In order to fi...

It is usually said that the two SAP Frameworks (Web Dynpro ABAP and Web Dynpro Java) used to develop “state of the art” web business applications have more or less the same functionalities. The purpose of the present paper is to present the main differences and similarities between these two SAP frameworks, highlighting, in the same time, the premi...

Oxygen is one of the elements that negatively affect the quality of steel and this is the reason why, in practice, steps are being taken in order to technologically eliminate it front the steel bath. The deoxidation process is influenced by several factors:temperature, the chemical composition and slate of stirring of the bath, as well as the chara...

Today the most studied magnetic materials are the magnetic materials based on the nanoparticles in solid or liquid matrix. The knowledge of the ferrite nanoparticles in high frequency magnetic fields insures the possibility to know the behavior of the magnetic materials based on nanoparticles. The nanocomposites based on ferrite nanoparticles and p...

The raw material used for producing cement is obtained using several components which we must dosages so that the mixture should have a uniform chemical composition. This paper work proposes fuzzy algorithms for performing this process. Using them turns the control dosage system more simple and it allows any high performance. The system we propose...

In this paper it is presented an analysis regarding the modeling technique and design of a database realized by the developer in an ERP (enterprise resources planning) type integrated system, namely SAP (system application product). Such a database creation can be very easily realized using the system tools, and it is required when the SAP standard...

In the computational analysis of nano-particle magnetic media, usually periodic models for nano-particle disposal are involved. These models, for lower computational costs, assume that the material has a deterministic and ordered distribution of nano-particles. However, real nano-structured magnetic media show non-uniformly distribution of nano-par...

With increasing interest in realising new magnetic materials, the magnetic behaviour of the nanoparticle disperse systems became an important problem both from the experimental point of view and from the theoretical one. The researches performed in the last period show that, by controlling the size distribution, the effective anisotropy constant an...

This paper present the results obtained by simulation for the functioning regime improvement of an UHP Electric Arc Furnace. Because the nonlinearity of the electric arc the EAF functioning regime are perturbed from three causes: the current harmonics, the reactive power and the unbalanced load. In this paper there are study the possibilities of ha...

Some memory e®ects in nanoparticle systems, similar to those seen in spin glass systems, may have important device applications, by tuning the interaction and the particle size. Recently, this subject provoked a special interest in nano-sciences. In this work we present a study, by simulation of the mode in which the behavior of a magnetic nanopart...

Due to the complexity of the magnetic nanoparticles systems, their study by simulation, requires more and more performant algorithms. This work represents an implementation of an advanced Monte Carlo algorithm, MCAMC (Monte Carlo with Absorbing Markov Chains) for the study of the magnetic relaxation processes in nanoparticles systems. The achieved...

The electric arc furnaces are a very large power load, determining the negative effects on the power quality (harmonics currents, unbalanced load, and reactive power). For a maximum efficiency of the power consumption it is necessary to use an automat system of electrodes position control, in order to obtain a high value of power factor. In this pa...

The electric arc is a nonlinear element. For this reason it must be used special techniques of modeling the electric arc that should reflect as closely as possible the behavior of the real electric arc. In this paper, the modeling of the functioning of the electrical installation of the electric arc furnace was done using the PSCAD-EMTDC simulation...

This paper present the results obtained by simulation for the functioning regime improvement of an UHP Electric Arc Furnace. Because the nonlinearity of the electric arc the EAF functioning regime are perturbed from three causes: the current harmonics, the reactive power and the unbalanced load. In this paper there are study the possibilities of ha...

The most challenging problem in physics of disordered systems of magnetic nanoparticles is the investigation of their dynamical properties. The major difficulty here is due to the long – range and dipolar inter particle interaction. Some experimental and theoretical researches of last period on the relation between the dipolar magnetic interaction...

It is very well known that electric arc furnace as a three-phase charge – one of the most important generators of harmonic currents, reactive power and unbalanced conditions in electrical power systems. To study the effect of the reactive power compensation installation, it is necessary to know the values of the electrical parameters of the arc fur...

The functional analysis of electric scheme including an AC electric are involves the use of techniques of modeling the electric arc that should reflect as closely as possible the behavior of the real electric arc. This can be done by means of general programs for non-linear circuits, or programs that are specific for a more restricted domain. In th...

The simulation is very useful in analyzing the behavior of nonlinear loads such the electric arc furnaces. The electric arc is a nonlinear element and from this reason it give rise to negative effects on the electric power quality, especially in case of the UHP electric arc furnaces (harmonic currents, reactive power and unbalance three phase load)...

This paper presents the results obtained by numerical simulations, the magnetic relaxation time simulation for a fine particle system with dipolar magnetic interaction. We used a 3D simulation model for fine magnetic particles with spherical shape and lognormal distribution for their diameters. Starting from Dormann–Bessais–Fiorani model, the 3D mo...

This work suggests a comparative study of the models for simulating the behavior of the ferritic nano-composites within radio-frequency magnetic fields: Leinders model [1], model proposed by the author [2] and empirical model [3].

This paper presents an improved simulation method, which permits to study the influence of the electromagnetic high frequency fields on the properties of magnetodielectrical materials. The original method was published by the first author in [JMMM 234 (2001) 148]. The proposed method can be used, for example, to simulate the dependency on the frequ...

The paper introduces a method of simulating magnetodielectric composite media by analogy with Leinders's method (J. Phys. I (France) 5 (1995) 555), which starts from the study of the behavior of a magnetodielectric binary mixture inside an electromagnetic field. The work hypothesis is that the dimensions of the magnetic particles are much smaller t...

This paper presents an evaluation of the parallel processing for meshless algorithm for solving Navier-Stokes problems in fluid dynamics. The fluid dynamics existing solvers take use of finite element methods which are cumbersome and very exhaustive in computational resources. Meshless algorithms uses a different approaches using high level eigenva...