Catalog Reviste

Thomas Provent1+, Rémi Manczak1, Sofiane Saada2, Claire Dalmay1, Barbara Bessette2, Pierre Blondy1, Gaëlle Begaud2, Serge Battu2, Marie Odile Jauberteau2, Fabrice Lalloué2, Arnaud Pothier1

This paper demonstrates the use of Ultra-High Frequency Dielectrophoresis to sort populations of biological cells. The principal aim of this lab-on-chip cytometer is to sort in a continuous flow different types of cells in suspension based on their dielectrics properties. To achieve this objective, this cytometer combines hydrofluidics and repulsive dielectrophoresis forces. We also show the importance to apply at cells a proper electric field at a specific frequency range to produce different force intensities and associated trajectory deflections. The device efficiency will be illustrated with an example of mesenchymal cells sorting.

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$DIGITAL FINGERPRINT OF THE PROTECTED ENVIRONMENT$

ROTAR DAN1*, ANDRIOAIA DRAGOȘ1

The development of IOT (Internet of Things) technology has led to the emergence of numerous applications that use the Internet as a means of communication. The paper presents an application of this kind that represents a smart home. The main feature of this application is due to the presence of artificial intelligence. Thus, a neural network is used to predict the occurrence of adverse events. This aim is a fingerprint of the signals generated by the sensors for different regimes of the smart house. When changing the fingerprint, the neural network decides whether the modification constitutes a dangerous situation and causes the measures to be taken accordingly.

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$STUDY OF NA AND K ALKALI ACTIVATORS ON THE CHARACTERISTICS OF A LEBANESE METAKAOLIN-BASED GEOPOLYMER MORTAR$

Saba M.1*, Georges N.1, Michaud P. 2, Absi J.2

This work investigates the influence of various alkaline activators (Na and K) on the properties of a Lebanese metakaolin-based geopolymer mortar. The first part of this work consisted to find and treat a local Lebanese source of kaolin. The metakaolin was later produced by the calcination of the local kaolin at a temperature reaching 700˚C. Once prepared the silica, alumina and alkali activator (either Na or K based) were mixed together in order to obtain the required mortars. Results indicated that the sodium based geopolymer mortars exhibit a greater compressive mechanical strength than the potassium based mortars.

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$PREPARATION AND CHARACTERIZATION OF MAGNETIC ZnO/ferrite NPs FOR Cu2+ REMOVAL FROM AQUEOUS SOLUTION$

Sofien SAIDANI1,2,3, Lotfi BEN TAHAR2,3,4, Agnès SMITH1, Youssef EL HAFAIANE1, Leila SMIRI2

The increasing level of heavy metal ions in wastewater present a serious risk for human health and ecological system because they are non-biodegradable. Magnetically assisted chemical separation method using magnetic nanoparticles with a large active surface opens the door to a new generation of waste water treatment technology. In the present work, magnetic ZnO/ferrites nanoparticles were prepared to improve the efficiency of copper removal from artificial water. The ZnO/ferrites nanoparticles were synthetized by hydrothermal method and were characterized by several techniques. The adsorption properties as function of different parameters were carried out in order to understand the mechanism of adsorption.

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$INTERMOLECULAR RESONANCE ENERGY TRANSFER IN THE PRESENCE OF METALLIC NANOPARTICLES: FINITE ELEMENT SIMULATIONS$

TITUS SANDU1*, CATALIN TIBEICA1, OANA NEDELCU 2, MIHAI GOLOGANU 1

Plasmon resonances in metallic nanoparticles augment the Förster resonance energy transfer (FRET) between two molecules. We calculate and analyze comparatively the enhancement factors of FRET for a metallic nanosphere and for a metallic spherical nanoshell by finite element method (FEM). These calculations are compared with analytical results obtained from the knowledge of spectral properties of the Neumann-Poincaré (electrostatic) operator for sphere. With respect to the plain metallic nanosphere, the spherical nanoshell shows a greater tunability of energy range for which the energy transfer is enhanced. Our work can be relevant for using FRET for various applications regarding porous materials.

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$VALORIZATION OF CLAY MATERIALS FROM CENTRAL AFRICAN REPUBLIC AS SILICATE CERAMICS$

Rosellyne SEREWANE DERAMNE 1,2, Gisèle Laure LECOMTE-NANA1*, Bruno Serge GONIDANGA2, Claire PEYRATOUT1, Gado TCHANGBEDJI3

The present study is in line with sustainability and environmental issues regarding the utilization of local materials and wastes for developing silicate ceramics in RCA (Central African Republic). Two clay deposits were selected for this purpose and noted NZ1 and KO. Their chemical and mineralogical analyses revealed the presence of major clay mineral phases as kaolinite and illite; while quartz, and iron oxide/hydroxide phases were detected as secondary crystalline phases. The use of Winkler and chemical composition diagrams, according to the results of chemical analysis and granulometry of these clay materials, indicated their suitability as starting materials for the manufacture of earthenware ceramics.

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$CROSS-PLATFORM MOBILE APPLICATIONS DEVELOPMENT WITH CLOUD BACKEND$

COSMIN TOMOZEI1, IULIAN FURDU2

The aim of this paper is to present the Android mobile application development process, by using Microsoft technologies, such as Xamarin platform and the corresponding Cloud infrastructure. Certain teste are to be realised tests will be built in the C# programming language and AXML mark-up. We will then evaluate the most effective way to write code for mobile devices and continue building a reliable infrastructure by the integration of mobile and Cloud technologies and the use of multimedia.

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$BRINGGING SEMANTICS TO SOCIAL MEDIA CONTENT$

VÂRLAN SIMONA ELENA1*

It is well known that Social Web is „growing” bigger and bigger and more diverse. An important issue relative to the huge amount of information user generated content is that knowledge coming from different communities of users in social media cannot be linked or shared because user generated content, in general, doesn’t have machine interpretable metadata that can be “understood” by computers. The connection can be done assigning meaning to web content with the help of the Semantic Web standards. The paper presents a study about role and uses of Semantic Web technologies within the framework of social media. A case study about the effective use of these technologies in a web application that lists the posts introduced by users, which can be found in different social sites is provided. The application was meant for usage within the Romanian research team.

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$DISSEMINATION OF RESISTANT BACTERIA IN THE ENVIRONMENT IN LEBANON$

HOBEIKA WADAD1, 3, DAGOT CHRISTOPHE 1,2, BUELOW ELENA1, KARAM SARKIS DOLLA 3

In order to evaluate the dissemination problem of antimicrobial resistance genes in Lebanese rivers, a study of the presence and relative abundance of resistant bacteria was conducted during two different seasons. In total, more than 22500 resistant bacterial colonies were isolated with cultural techniques on selective media supplemented with antibiotics. The resistant bacteria isolated were Enterobacteriaceae, non-fermenters and Staphylococcus spp. At estuarian sites, 20.58% and 91.76% of the Gram-negative bacteria were producers of extended spectrum beta-lactamases of which 14.28% and 100% showed resistance to imipenem.

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$LORA NETWORKS FOR IOT DEPLOYMENTS$

YAZBEK Abdul Karim1, XU Peng, YANG Rufei, MEGHDADI Vahid2

IoT deployments require long-range wireless communications, especially in urban and metropolitan areas. LoRa is one of the most promising technologies in this context because of its simplicity and flexibility. In fact, the deployment of LoRa networks in dense IoT scenarios must achieve two main objectives: effective communication between a large number of devices and resilience to dynamic channel conditions due to demanding environments (for example, the presence of many buildings). This paper reviews and shows a LoRa network deployed within our team that will be deployed in our building. This work is part of the regional project "E-Water Efficiency", where we are working to improve the robustness of environmental sensor networks. We are implementing around thirty sensors on STM32 cards that are used to transmit packets to a gateway, then will be sent back to the cloud for processing at the final destination. In fact, the work environment will strongly influence the design of the network. But once the network is operational, we can implement coding algorithms to improve robustness, such as: non-rate coding, network coding, cooperative relay communication, rank metric coding, etc. This paper presents pedagogical efforts made for the practical implementation of such a network.

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$RE-ENTRANT CAVITY FOR MATERIALS CHARACTERISATION$

APEDJINOU Anoumou1, PASSERIEUX Damien 1, MADRANGEAS Valérie 1, CROS Dominique 1

The re-entrant cavity, or klystron cavity, is used in this application to determine the dielectric permittivity of materials. One of the advantages of this structure is that it allows a characterization at low frequencies for small sample sizes. The other important point is that this device associated with an original coupling system, leads to information that can determine both the permittivity and the thickness of the sample under test.

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$LAB-ON-A-CHIP FOR CELLULAR ANALYSIS BY DIELECTRIC SPECTROSCOPY BASED ON INJECTION LOCKED OSCILLATORS$

M. Babay¹, C. Dalmay¹, B. Barelaud¹, E.C. Dumaz3, C. Baristiran Kaynak3, M. Kaynak3, D. Cordeau², A. Pothier¹

This paper presents the development of a lab-on-a-chip for cellular analysis with the implementation of RF biosensors based on injection-locked oscillators. The proposed circuit can evaluate the dielectric response of suspended cells circulating in a microfluidic channel. Under these conditions, a detection accuracy of a few attoF is necessary to discriminate differences between cells. For oscillators operating in free running frequency, it would generate variations of the oscillation frequency of the order of 10 kHz near 5 GHz, which is very complex or almost impossible to detect. We propose here a relevant approach.

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$DC MOTOR SPEED CONTROL WITH THE ARDUINO UNO DEVELOPMENT BOARD AND THE L293 DRIVER$

LIVINTI PETRU

In this article, was presented a speed control system for a low power DC motor made with the help of an Arduino Uno development board and the L293 driver. In the Laboratory of Electrical Machines and Drives of the Faculty of Engineering .of Bacau, the experimental stand needed for the implementation and validation of the program for Arduino Uno was realized. The speed of rotation of the DC motor is changed by means of a potentiometer. The speed of rotation is measured using a Hall magnetic sensor. The DC speed control system can also be used for the command of the industrial robots. If we use two Arduino development boards and two NRF24L01 shilds, we can realize the wireless remote control of the DC motor.

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$AN ANALYSIS OF CYBER SECURITY SOFTWARE TOOLS$

GEORGE CULEA

Cybersecurity in the new digital era has a special role in protecting against cyber-attacks, which year after year is increasing, affecting a wide range of companies and users. It has as its objective the protecting computers, networks and software from such cyber-attacks. The diversity and complexity of the attacks required the development of various tools to identify security breaches, attacks and to respond to them through various measures. This work presents the analysis of certain software and hardware tools in the field of cybersecurity. The analyzed software tools are: GravityZone Ultra, GravityZone Full Disk Encryption, GravityZone Patch Management, Rapid 7 Vulnerability Management and Nessus Professional. Between this hardware tools are presented: Ultimate Forensic Write Protection Kit II, TX1 Forensic Imager and Firewall - ASA 5506 with FirePOWER services. These tools have been analysed from the point of view of the performed operations, automatic detection, investigation and response and reporting and notifications. Within the performed operations were considered: prevention actions, protection against threats, firewall, equipment control and application control. The paper presents the results of the run of these applications within the IT infrastructure of an organization, presenting a comparative analysis of vulnerability assessment, malware detection, automated response and report generation. At the conclusions are presented the positive components furnished by every analyzed instrument.

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$THE INTRA-URBANE MICROCLIMATE OF BACĂU CITY DISTURB POPULATION’S CARDIOVASCULAR HEALTH$

CULEA CĂTĂLINA MIHAELA

This study is based on the metallic toxicity assessment by inductively coupled plasma ThermoOptek XSéries with spectrometer X7/CCT to biologic fluids from 54 deceased peoples by and/or cardiovascular diseases cause and healthy volunteers (90). It was determined that the medians sanguine concentrations of cadmium for example, for healthy peoples was 0.31 μg/L, which means that was approximately 107 more decreased than in dead subjects (33.3μg/L). In conclusion, uninvestigated metallic profile may be a great obstacle for the efforts to upgrade the quality of life for peoples suffering or presents cardiovascular risks. However, it is necessary to extend these kinds of studies for establish the codetermination of metallic quantitation in biological fluids with a significant cardiovascular cause of deaths, to corroborate our findings.

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Volume 9, No. 1 (2019)

Articles