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Vladutoiu L.,National Institute of Research | Chisiu G.,Polytechnic University of Bucharest | Andrei T.,Polytechnic University of Bucharest | Predescu A.,Polytechnic University of Bucharest | And 2 more authors.
IOP Conference Series: Materials Science and Engineering | Year: 2017

The goal of this study was to analyze the behaviour of chisel knife type penetration in a certain type of sand. A series of penetration tests were carried out with chisel knife type, the answer to penetration depending mainly on nature, shape, size of knife and operating parameters such as speed, depth and working conditions. Tests were conducted in work conditions with wet sand and dry sand and determined force of resistance to penetration of the chisel knife type to a certain depth. © Published under licence by IOP Publishing Ltd.


Janta D.,National Institute of Public Health | Janta D.,U.S. Center for Disease Control and Prevention | Stanescu A.,National Institute of Public Health | Lupulescu E.,National Institute of Research | And 2 more authors.
Eurosurveillance | Year: 2012

A rubella outbreak has been ongoing in Salaj, Romania since September 2011 involving 1,840 probable and confirmed cases among mainly unvaccinated adolescents. The index case had onset of illness on 6 September 2011. The highest number of cases was recorded among 10-14-year-olds and 15-19-year-olds. Complications were recorded for 11 cases and included meningitis and arthritis. Although the peak has passed, surveillance is being maintained in the region.


Popescu A.-M.,Ilie Murgulescu Institute of Physical Chemistry | Constantin V.,Ilie Murgulescu Institute of Physical Chemistry | Soare V.,National Institute of Research | Tircolea M.,University of Bucharest | Olteanu M.,Ilie Murgulescu Institute of Physical Chemistry
Revista de Chimie | Year: 2011

This Study deals with the obtaining of corrosion protection Zn-Ni-P films deposited on steel products. The protective thin layers were deposited by both electrochemical and electroless processes in aqueous solutions. The development of such deposition techniques of films with high mechanical and chemical resistance will contribute to the gradual replacement of the conventional corrosion protection method through thermal zinc plating. The obtained Zn-Ni-P films have been characterized by scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX) in an attempt to understand the chemistry and structure of the films before and after the corrosion process. The corrosion behaviour in 3.5 wt% NaCl solution of different samples of thin Zn-Ni-P films deposited on steel (which differ by the way of preparation) was determined by open circuit potential vs. time curves, linear polarization and Tafel plots and compared with the behaviour of steel support. The corrosion parameters were calculated and the obtained results were correlated with the micrographic images of the studied samples. The influence of Zn/Ni ratio and P content of the alloy on the corrosion protection properties was evaluated.


Gheorghe G.I.,National Institute of Research | Badita L.-L.,National Institute of Research
Digest Journal of Nanomaterials and Biostructures | Year: 2012

Topographic characterization of materials is important to determine features of different surfaces that are used in many areas. During the time, these surfaces deteriorate and complex deterioration mechanisms appear. There are techniques with complex mechanisms that allow observing all the surface characteristics. In INCDMTM, a mechatronic system made up of an atomic force microscope and a robotic nanomanipulator is used in order to characterize steel, titanium alloys or CoCr alloys surfaces. It is a proper system to study surfaces of different materials from tribological point of view.


Dragos M.,National Institute of Research | Gheorghe V.,Polytechnic University of Bucharest | Gigel P.,Polytechnic University of Bucharest | Eugen M.,National Institute of Research
Engineering for Rural Development | Year: 2016

The aim of this paper was to evaluate the performances of adirect seeder for grasslands, both in laboratory and in the field.The tests were conducted at the National Institute of Research - Development for Machines and Installations Designed to Agriculture and Food Industry - INMA Bucharest, during the spring season in 2014.The laboratory performance indices were: seed rate, seed rate instability and unevenness degree of seed distribution on the working width.The field qualitative and energetic indices were: average working depth on seedbed preparation, average width of the strips, average depth of seed incorporation on working width, standard deviation to the average depth of seeding on the working width, coefficient of variation of depth of seeding on the working width and uniformity of plant distribution in one row, fuel consumption per hour, hourly working capacity and fuel consumption per surface unit.The values of standard deviation to the average depth of seeding on the working width and the coefficient of variation of the depth of seeding on the working width were lower, when the seeder moved with the speed of 1.16 m·s-1. The higher uniformity of plant distribution in one row was obtained at the same working speed. The tested seeder for degraded grasslands showed good performances strictly connected to the proper adjustment of the working depth and seed rates and to the correct choice of the working speed.


Pascu C.,National Institute of Research
Romanian Review Precision Mechanics, Optics and Mechatronics | Year: 2010

The mechatronic equipment for measuring, adjusting and controlling pressures and temperatures is a branch developed within the horizontal economy and it is of crucial importance in all of the industry's branches: for automating the industrial processes, energetics (thermal, hydro - fluid based, nuclear, etc) with applications in the following industries: car manufacturing, chemistry, petrochemistry, transports (auto, railway, naval, aerial), food, metallurgy and siderurgy, education (laboratories), agriculture, etc.


Doroftei C.,Al. I. Cuza University | Doroftei C.,National Institute of Research | Popa P.D.,National Institute of Research | Iacomi F.,Al. I. Cuza University | Leontie L.,Al. I. Cuza University
Sensors and Actuators, B: Chemical | Year: 2014

The nanocrystalline La0.8Pb0.2Fe 1 - xZnxO3 (x = 0, 0.05, 0.10 and 0.20) powders with orthorhombic perovskite structure were synthesized by a novel self-combustion method using polyvinyl alcohol as colloidal medium. The samples were investigated with regard to their composition and microstructure, using XRD and SEM-EDX methods, their electric properties and gas-sensing properties (resistivity response) to ethanol, acetone and hydrogen. The crystalline lattice constants, the porosity, specific surface area and electric resistivity increase with the increasing amount of zinc ions, which substitute the iron in La0.8Pb0.2FeO3-based perovskite (x = 0). The studied samples show p-type semi-conducting properties for all the studied gases within the temperature range of 100-380 C. For acetone at the concentration of 400 ppm in the case of the sample with x = 0, the response value is 140; it increases with the increasing quantity of Zn2+ ions up to 560 for x = 0.1, and significantly decreases (down to 45) for x = 0.2. One can state that the sensitivity of La0.8Pb0.2Fe1 - xZn xO3 samples is strongly affected by the amount of Zn 2+ ions. The spectacular increase of the response to acetone (560) for the sample with x = 0.1 is remarkable. © 2013 Elsevier B.V.


Olariu C.S.,National Institute of Research | Ababei G.,National Institute of Research | Lupu N.,National Institute of Research | Chiriac H.,National Institute of Research
Physica B: Condensed Matter | Year: 2016

The aim of this work is to present a complex experimental and theoretical study of the ferromagnetic resonance frequencies and plasma behavior for CoFe-based, Co-based, Fe-based and FINEMETTM glass covered amorphous microwires (GCAWs), arranged in parallel configurations as free-standing systems, as well as combinations thereof, in order to obtain metastructures with tailored and enlarged left-handed frequency domain. The negative magnetic properties interval of the metastructures is expanded by alternating different types of GCAWs with close natural ferromagnetic resonance (NFMR) and natural antiferromagnetic resonance (NFMAR) domains, respectively. © 2015 Elsevier B.V. All rights reserved.


Velicu I.-L.,Al. I. Cuza University | Neagu M.,Al. I. Cuza University | Chiriac H.,National Institute of Research | Tiron V.,Al. I. Cuza University | Dobromir M.,Al. I. Cuza University
IEEE Transactions on Magnetics | Year: 2012

Using high-power impulse magnetron sputtering (HiPIMS) technique, Fe 73.5Cu 1Nb 3Si 15.5B 7 thin films with thickness between 40 and 700 nm were deposited. The influence of deposition conditions (deposition time and argon pressure) and of the annealing temperature on the structure and coercive magnetic field of the magnetic films was analyzed. In the as-deposited state, the coercive magnetic field presents a minimum at about 10 mtorr argon pressure. The X-ray diffraction studies show that in the as-deposited state, the samples are amorphous, while after annealing at temperatures between 400°C to 525°C, α-Fe(Si) grains start to nucleate, the grain size varying from 2 to 18 nm. The Curie temperature of as-deposited amorphous phase and the onset of the primary crystallization are 355°C and 460°C , respectively. The lowest coercive magnetic field was obtained after annealing at 475°C. © 2006 IEEE.


Papadopoulos N.,National Technical University of Athens | Karayianni C.-S.,National Technical University of Athens | Tsakiridis P.,National Technical University of Athens | Sarantopoulou E.,National Institute of Research | Hristoforou E.,National Technical University of Athens
Chemical Vapor Deposition | Year: 2011

Cobalt thin films are deposited by metal-organic (MO)CVD, under various experimental conditions, on Si and SiO2 substrates. The precursors used are cobalt nitrosyl tricarbonyl, Co(CO)3NO, cobalt acetylacetonate, Co(acac)2, and cobalt carbonyl, Co 2(CO)8. Emphasis is given to the delivery method of each precursor, especially to a new technique of aerosol delivery. The films are thoroughly examined in terms of microstructure and surface morphology in order to establish relevance to magnetic properties. It is found that Co films deposited from Co2(CO)8 dissolved in dichloromethane are characterized by a high degree of planarity and purity, while exhibiting a non-hysteretic giant magnetoresistance (GMR) behavior in the presence of an externally applied magnetic field normal to their surface. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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