Institute of Applied Research

Beersheba, Israel

Institute of Applied Research

Beersheba, Israel
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Auslender M.,Israel Electric | Felner I.,Hebrew University of Jerusalem | Mogilyansky D.,Institute of Applied Research | Mukovskii Ya.M.,Moscow Institute of Steel And Alloys
Journal of Applied Physics | Year: 2011

Magnetic properties, electron paramagnetic and ferromagnetic resonance were studied in the vicinity and above ferromagnetic-paramagnetic (FM-PM) phase transition of the La0.9Sr0.1MnO3 crystal. It appears that complex chemical/structural disorder inherent to manganites influences strongly on both magnetic and resonance properties of this crystal. In particular, it changes the nature of a FM-PM transition to the first- or mixed-order one and induces FM clustering in their PM state. The latter effect results in coexistence of resonance signals, and non-linearity of the PM inverse magnetic susceptibility versus temperature. This model seems to be much more realistic for description of the PM state in La0.9Sr 0.1MnO3 than an idealized Griffiths phase approach. © 2011 American Institute of Physics.


Yousef M.,Institute of Applied Research | Allmer J.,Izmir Institute of Technology | Allmer J.,Bionia Incorporated | Khalifa W.,Institute of Applied Research
BIOINFORMATICS 2016 - 7th International Conference on Bioinformatics Models, Methods and Algorithms, Proceedings; Part of 9th International Joint Conference on Biomedical Engineering Systems and Technologies, BIOSTEC 2016 | Year: 2016

Traditionally, machine learning algorithms build classification models from positive and negative examples. Recently, one-class classification (OCC) receives increasing attention in machine learning for problems where the negative class cannot be defined unambiguously. This is specifically problematic in bioinformatics since for some important biological problems the target class (positive class) is easy to obtain while the negative one cannot be measured. Artificially generating the negative class data can be based on unreliable assumptions. Several studies have applied two-class machine learning to predict microRNAs (miRNAs) and their target. Different approaches for the generation of an artificial negative class have been applied, but may lead to a biased performance estimate. Feature selection has been well studied for the two-class classification problem, while fewer methods are available for feature selection in respect to OCC. In this study, we present a feature selection approach for applying one-class classification to the prediction of miRNA targets. A comparison between one-class and two-class approaches is presented to highlight that their performance are similar while one-class classification is not based on questionable artificial data for training and performance evaluation. We further show that the feature selection method we tried works to a degree, but needs improvement in the future. Perhaps it could be combined with other approaches. Copyright © 2016 by SCITEPRESS - Science and Technology Publications, Lda. All rights reserved.


Beloborodova T.G.,Institute of Applied Research | Panov A.A.,Institute of Applied Research | Anasova T.A.,Institute of Applied Research | Zaikov G.E.,RAS Emanuel Institute of Biochemical Physics | Panov A.K.,Institute of Applied Research
International Polymer Science and Technology | Year: 2013

An effective design of a two-rotor mixer with Z-shaped, sectional rotors made up of several parts is presented. This is the main equipment for the preparation of pastes and the mixing of granular materials, and also for the plasticisation of composite polymeric materials. ©2013 Smithers Rapra Technology.


Zagidullin R.N.,Institute of Applied Research | Zagidullin S.N.,Institute of Applied Research | Yamaleev R.F.,Institute of Applied Research | Gil'mutdinov A.T.,Ufa Petroleum Technical University
Chemical and Petroleum Engineering | Year: 2015

Compositions based on modified formaldehyde resins and used for protection of oilfield and petrochemical equipment and for well insulation and lining are described. A new anticorrosion composition for the protection of chemical and petrochemical equipment that is resistant to aggressive media, relatively cheap, and suitable for the protection of both external and internal surfaces of equipment and pipelines was developed. Chloroorganic industrial wastes isolated by steam distillation are used as the active principle for producing the anticorrosion composition. © 2015 Springer Science+Business Media New York


Krotkus S.,Institute of Applied Research | Kazlauskas K.,Institute of Applied Research | Miasojedovas A.,Institute of Applied Research | Gruodis A.,Vilnius University | And 3 more authors.
Journal of Physical Chemistry C | Year: 2012

New pyrenyl mono- and disubstituted fluorene and carbazole derivatives were synthesized and investigated as blue-emitting materials. Most of the synthesized compounds were capable of forming glasses with glass transition temperatures up to 105 °C. The mono- and disubstituted compounds exhibited efficient emission in a diluted form with the peak wavelengths of 416 and 422 nm and quantum yields of 0.72 and 0.82, respectively. Photophysical properties of the compounds in dilute solutions and solid state were investigated experimentally and rationalized by density functional theory calculations. The calculations revealed a low energy barrier for intramolecular twisting in the ground and excited states. The electronic spectra of the compounds were dominated by an allowed “pyrene-likeâ€' S 0 â†' S 2 transition prevailing in nearly perpendicularly twisted molecular structures and competitive S 0 â†' S 1 transition becoming increasingly allowed for more planar conformers. The disubstituted compounds demonstrated a 3-fold enhanced oscillator strength of S 0 â†' S 1 transition, giving rise to the enhanced fluorescence quantum yield, significant shortening of the fluorescence lifetimes (from 2.5 ns down to 1.0 ns), and 3-fold reduced amplified spontaneous emission threshold as compared with those of the monosubstituted compounds. Introduction of the bulky dihexyl group into the pyrenyl-disubstituted fluorene enabled remarkable suppression of emission concentration quenching in a solid state and ensured high emission quantum yield (0.63) in the wet-casted neat films. Pyrenyl disubstitution of fluorene and a sterically hindered aliphatic group enabled observation of a low amplified spontaneous emission threshold (20 kW/cm 2) for the compound dispersed in the inert polystyrene host at a rather large (5 wt %) chromophore concentration. © 2012 American Chemical Society.


Liaugaudas G.,institute of Applied Research | Jarasiunas K.,institute of Applied Research | Tsavdaris N.,Grenoble Institute of Technology | Sarigiannidou E.,Grenoble Institute of Technology | Chaussende D.,Grenoble Institute of Technology
Materials Science Forum | Year: 2015

Investigation of excess carrier dynamics in a 15R-SiC bulk layer grown by physical vapour transport (PVT) on 15R-SiC substrate has been carried out using “pump-probe” techniques: an interband carrier injection by a picosecond laser pulse and measuring the induced absorption and diffraction of a probe beam. For this task, differential transmittivity (DT) and light induced transient grating (LITG) techniques were used. Room temperature carrier lifetime varied in the 3 ns - 8 ns range at excess carrier densities above ∆No = 7×1017 cm-3 and was ascribed to the recovery time of optically recharged carrier traps, and their activation energy of Ea = 75 meV was determined. The presence of recharged traps caused the injection-dependence of the diffusion coefficient D, whereby its value dropped below 0.1 cm2/s at ∆No <1×1018 cm-3 and gradually increased up to 0.7 cm2/s at higher injections. At elevated temperatures (300 K < T < 700 K), when the traps are thermally activated, the diffusivity increased up to ~ 1.5 cm2/s and was independent on ∆ No). The overgrown layer parameters were comparable to those of the used 15R PVT seed. © (2015) Trans Tech Publications, Switzerland.


Loman L.A.,Institute of Applied Research | Siegel G.L.,Institute of Applied Research
Child Abuse and Neglect | Year: 2015

An outcome analysis was conducted based on an extended follow-up of the implementation of differential response program reforms in Child Protective Services offices in 10 counties in a Midwestern U.S. State. Random assignment was conducted of families that were first determined to be appropriate for family assessments. Experimental families (n = 2,382) were each assigned to a non-forensic family assessment, and control families (n = 2,247) each received a forensic investigation. Families were assigned continuously over a 15-month period and then tracked from 45 to 60 months from the date of assignment. Detailed information on services provided and family responses was obtained via two subsamples of experimental and control families. Measures of family engagement and service reception and utilization were utilized to determine instrumental outcomes introduced through family assessments. Improved family engagement and increased and broadened services were found to have occurred, and it was theorized that these changes mediated extended outcomes. Extended outcomes included reductions of rates of subsequent screened-in reports of child maltreatment, proportions of families that experienced child removals, and instances of new safety threats and problems in parenting. Differences in outcomes were found among the participating counties with 4 counties accounting for most outcome differences. The relationships between instrumental and extended outcomes were discussed with suggestions for further research. © 2014 The Authors.


Liaugaudas G.,Institute of Applied Research | Jarasiunas K.,Institute of Applied Research | Tsavdaris N.,Grenoble Institute of Technology | Sarigiannidou E.,Grenoble Institute of Technology | Chaussende D.,Grenoble Institute of Technology
Materials Science Forum | Year: 2014

Free carrier lifetimes and diffusion coefficients were determined in 6H-SiC bulk crystals grown by PVT on 6H- and 4H-SiC seeds varying the temperature from 300 K to 650 K and at excess carrier densities ΔN0 from 1017 cm-3 to 1019 cm-3. Carrier generation was achieved by using a single or two-photon absorption of picosecond pulses at 351 and 532 nm, respectively. Fast and slow recombination transients revealed the decay time of free carriers and the presence of deep acceptor traps. The thermal trap activation energy Ea = 0.33 eV was determined in the 6H/4H sample and ascribed to the boron, while the presence of deeper traps is suggested in the 6H/6H sample. At room temperature and reaching conditions of trap saturation regime (ΔN0 ≈ 1019 cm3), both crystals revealed the bipolar diffusion coefficient Da ≈ 4 cm2/s. For comparison, we also determined the photoelectrical parameters in commercial 6H-SiC crystals grown by the Lely and PVT techniques. © (2014) Trans Tech Publications, Switzerland.


Pavlov J.,Institute of Applied Research | Ceponis T.,Institute of Applied Research | Gaubas E.,Institute of Applied Research | Meskauskaite D.,Institute of Applied Research | And 4 more authors.
Journal of Instrumentation | Year: 2015

Operational characteristics of sensors made of GaN significantly depend on technologically introduced defects acting as rapid traps of excess carriers which reduce charge collection efficiency of detectors. In order to reveal the prevailing defects in HVPE and MOCVD grown GaN, the carrier lifetime and photo-ionization spectra have been simultaneously measured by using microwave probed photo-conductivity transient technique. Several traps ascribed to impurities as well as vacancy and anti-site type defects have been identified in HVPE GaN material samples by combining photo-ionization and electron spin resonance spectroscopy. The optical deep level transient spectroscopy technique has been applied for spectroscopy of the parameters of thermal emission from the traps ascribed to technological defects in the Schottky barrier terrace structures fabricated on MOCVD GaN. © 2015 IOP Publishing Ltd and Sissa Medialab srl.


PubMed | Institute of Applied Research
Type: | Journal: Child abuse & neglect | Year: 2015

An outcome analysis was conducted based on an extended follow-up of the implementation of differential response program reforms in Child Protective Services offices in 10 counties in a Midwestern U.S. State. Random assignment was conducted of families that were first determined to be appropriate for family assessments. Experimental families (n=2,382) were each assigned to a non-forensic family assessment, and control families (n=2,247) each received a forensic investigation. Families were assigned continuously over a 15-month period and then tracked from 45 to 60 months from the date of assignment. Detailed information on services provided and family responses was obtained via two subsamples of experimental and control families. Measures of family engagement and service reception and utilization were utilized to determine instrumental outcomes introduced through family assessments. Improved family engagement and increased and broadened services were found to have occurred, and it was theorized that these changes mediated extended outcomes. Extended outcomes included reductions of rates of subsequent screened-in reports of child maltreatment, proportions of families that experienced child removals, and instances of new safety threats and problems in parenting. Differences in outcomes were found among the participating counties with 4 counties accounting for most outcome differences. The relationships between instrumental and extended outcomes were discussed with suggestions for further research.

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