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R Fega, U Goyal, H Ross, D Jaroszewski, H Paripati, H Kosiorek, T B Daniels, S E Schild, W G Rule, S A Vora, J B Ashman
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
R Fega, G P Fletcher, J L Peterson, M R Waddle, D M Barrs, J B Ashman, B R Bendok, N P Patel, S A Vora
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
I S Lyubutin, S S Starchikov, N E Gervits, Chun-Rong Lin, Yaw-Teng Tseng, Kun-Yauh Shih, Jiann-Shing Lee, Yu L Ogarkova, N Yu Korotkov
The combustion method was used to prepare a precursor powder of an iron-gallium oxide compound which was further heat-treated in order to obtain a set of Fe1+xGa2-xO4 nanoparticles. All samples have a cubic spinel-type structure (space group Fd3[combining macron]m) and the particle size varies from 1.8 to 28.0 nm depending on the treatment conditions. From the comparative analysis by XRD, EDS, and Raman and Mössbauer spectroscopy the creation of a new spinel phase γ-FeGaO3, which was mainly located on the particle surface, was established...
August 10, 2016: Physical Chemistry Chemical Physics: PCCP
Hasnain Ahmad, Jayasimha Atulasimha, Supriyo Bandyopadhyay
We report reversible strain-induced magnetization switching between two stable/metastable states in ~300 nm sized FeGa nanomagnets delineated on a piezoelectric PMN-PT substrate. Voltage of one polarity applied across the substrate generates compressive strain in a nanomagnet and switches its magnetization to one state, while voltage of the opposite polarity generates tensile strain and switches the magnetization back to the original state. The two states can encode the two binary bits, and, using the right voltage polarity, one can write either bit deterministically...
2015: Scientific Reports
Hasnain Ahmad, Jayasimha Atulasimha, Supriyo Bandyopadhyay
We report observation of a 'non-volatile' converse magneto-electric effect in elliptical FeGa nanomagnets delineated on a piezoelectric PMN-PT substrate. The nanomagnets are first magnetized with a magnetic field directed along their nominal major axes. Subsequent application of a strong electric field across the piezoelectric substrate generates strain in the substrate, which is partially transferred to the nanomagnets and rotates the magnetizations of some of them away from their initial orientations. The rotated magnetizations remain in their new orientations after the field is removed, resulting in 'non-volatility'...
October 9, 2015: Nanotechnology
Yan Yan, Elisa Ricci, Ramanathan Subramanian, Gaowen Liu, Oswald Lanz, Nicu Sebe
Recently, head pose estimation (HPE) from low-resolution surveillance data has gained in importance. However, monocular and multi-view HPE approaches still work poorly under target motion, as facial appearance distorts owing to camera perspective and scale changes when a person moves around. To this end, we propose FEGA-MTL, a novel framework based on Multi-Task Learning (MTL) for classifying the head pose of a person who moves freely in an environment monitored by multiple, large field-of-view surveillance cameras...
June 2016: IEEE Transactions on Pattern Analysis and Machine Intelligence
K Rebecca Fega, Gregory A Abel, Gabriela Motyckova, Alexander E Sherman, Daniel J DeAngelo, David P Steensma, Ilene Galinsky, Martha Wadleigh, Richard M Stone, Jane A Driver
OBJECTIVES: The International Prognostic Scoring System (IPSS) is commonly used to predict survival and assign treatment for the myelodysplastic syndromes (MDS). We explored whether self-reported and readily available non-hematologic predictors of survival add independent prognostic information to the IPSS. MATERIALS AND METHODS: Retrospective cohort study of consecutive MDS patients ≥age 65 who presented to Dana-Farber Cancer Institute between 2006 and 2011 and completed a baseline quality of life questionnaire...
July 2015: Journal of Geriatric Oncology
Alec Kirkeminde, Shenqiang Ren
Metal nanoalloys have rapidly grown in importance due to their higher surface area and unique nanosized properties. The metal-redox methodology is used and expanded upon utilizing FeGa as a model system. It is shown to control the stoichiometry and size of magnetic FeGa nanoalloy composites for the first time.
May 21, 2015: Chemical Communications: Chem Comm
Yiwei Liu, Qingfeng Zhan, Guohong Dai, Xiaoshan Zhang, Baomin Wang, Gang Liu, Zhenghu Zuo, Xin Rong, Huali Yang, Xiaojian Zhu, Yali Xie, Bin Chen, Run-Wei Li
Thermal and electrical control of magnetic anisotropy were investigated in flexible Fe81Ga19 (FeGa)/Polyvinylidene fluoride (PVDF) multiferroic heterostructures. Due to the large anisotropic thermal deformation of PVDF (α1 = -13 × 10(-6) K(-1) and α2 = -145 × 10(-6) K(-1)), the in-plane uniaxial magnetic anisotropy (UMA) of FeGa can be reoriented 90° by changing the temperature across 295 K where the films are magnetically isotropic. Thus, the magnetization of FeGa can be reversed by the thermal cycling between 280 and 320 K under a constant magnetic field lower than coercivity...
2014: Scientific Reports
S J Geetha, Sanket J Joshi
Under field conditions, inoculated rhizobial strains are at a survival disadvantage as compared to indigenous strains. In order to out-compete native rhizobia it is not only important to develop strong nodulation efficiency but also increase their competence in the soil and rhizosphere. Competitive survival of the inoculated strain may be improved by employing strain selection and by genetic engineering of superior nitrogen fixing strains. Iron sufficiency is an important factor determining the survival and nodulation by rhizobia in soil...
2013: TheScientificWorldJournal
Blake M Rankin, Michael D Hands, David S Wilcox, K Rebecca Fega, Lyudmila V Slipchenko, Dor Ben-Amotz
Interactions between halide ions (fluoride and iodide) and t-butyl alcohol (TBA) dissolved in water are probed using a recently developed hydration-shell spectroscopic technique and theoretical cluster and liquid calculations. High ignal-to-noise Raman spectroscopic measurements are combined with multivariate curve resolution (Raman-MCR) to reveal that while there is little interaction between aqueous fluoride ions and TBA, iodide ions break down the tetrahedral hydration-shell structure of TBA and produce a red-shift in its CH stretch frequency, in good agreement with the theoretical effective fragment potential (EFP) molecular dynamics simulations and hybrid quantum/EFP frequency calculations...
2013: Faraday Discussions
Alexander E Sherman, Gabriela Motyckova, K Rebecca Fega, Daniel J Deangelo, Gregory A Abel, David Steensma, Martha Wadleigh, Richard M Stone, Jane A Driver
We explored whether geriatric assessment variables predicted mortality in addition to known prognostic factors in 101 patients aged ≥ 65 with newly diagnosed AML. Baseline comorbidity score (HR=1.92; 95%CI 1.18-3.11), difficulty with strenuous activity (HR=2.18; 95%CI 1.19-4.00), and pain (HR=2.17; 95%CI 1.19-3.97) were independent prognostic factors for greater risk of death in a multivariable model that included cytogenetic risk group. They remained independent predictors in the subset of patients with baseline ECOG PS 0-1...
September 2013: Leukemia Research
Munima B Sahariah, Subhradip Ghosh, Chabungbam S Singh, S Gowtham, Ravindra Pandey
The structural stabilities, elastic, electronic and magnetic properties of the Heusler-type shape memory alloy Ni(2)FeGa are calculated using density functional theory. The volume conserving tetragonal distortion of the austenite Ni(2)FeGa find an energy minimum at c/a = 1.33. Metastable behaviour of the high temperature cubic austenite phase is predicted due to elastic softening in the [110] direction. Calculations of the total and partial magnetic moments show a dominant contribution from Fe atoms of the alloy...
January 16, 2013: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Vyacheslav G Storchak, Jess H Brewer, Roger L Lichti, Rongwei Hu, Cedomir Petrovic
We report muon spin rotation spectra in the narrow-gap semiconductors FeGa(3) and FeSb(2) consistent with a narrow band of small spin polarons (SPs). The characteristic sizes obtained for these SPs are R(FeGa(3)) ≈ 0.3-0.6 nm and R(FeSb (2)) ≈ 0.3 nm, respectively. Such SP states are expected to originate from the exchange correlations between localized and itinerant electrons. Our data suggest that SP bands are formed at low temperature, but are destroyed by thermal fluctuations above 10 K in FeGa(3) and above 7 K in FeSb(2)...
May 9, 2012: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Kathryn Rebecca Fega, David Scott Wilcox, Dor Ben-Amotz
Raman spectroscopy and multivariate curve resolution (Raman-MCR) are combined to yield a powerful spectroscopic method for identifying solute-induced perturbations of solvent molecules. The principles and applications of the resulting solvation-shell spectroscopy are described and illustrated using both numerical model spectra and experimental Raman spectra, including water in acetone and aqueous OH(-), as well as of both neutral and ionic acetic acid solutions. The results illustrate the quantitative capabilities of Raman-MCR as a solvation-shell spectroscopy, including fundamental limitations arising from "intensity" and "rotational" ambiguities...
March 2012: Applied Spectroscopy
K Matsuda, H Mlnernoto, O Kamada, S Ishlzuka
We have fabricated optical isolators whose temperature dependence of the isolation ratio has a stability of <0.2 dB using (BiLuGd)(3)Fe(5)O(12)/(BiGd)(3)(FeGa)(5)0(12) composite film. It has been confirmed that the temperature-dependent forward loss of the isolators originates from the thermal fluctuation of the absorption peak in the films. We have also evaluated the degradation of the isolation ratio for collimated light depending on the incident angle of the collimated light, the incident position with respect to the optic axis, and the wavelength range needed for practical use...
April 1, 1988: Applied Optics
Brenton L Drake, Fernande Grandjean, Michael J Kangas, Edem K Okudzeto, Amar B Karki, Moulay T Sougrati, David P Young, Gary J Long, Julia Y Chan
Ln(4)FeGa(12), where Ln is Y, Tb, Dy, Ho, and Er, prepared by flux growth, crystallize with the cubic Y(4)PdGa(12) structure with the Im3m space group and with a = 8.5650(4), 8.5610(4), 8.5350(3), 8.5080(3), and 8.4760(3) A, respectively. The crystal structure consists of an iron-gallium octahedra and face-sharing rare-earth cuboctahedra of the Au(3)Cu type. Er(4)Fe(0.67)Ga(12) is iron-deficient, leading to a distortion of the octahedral and cuboctahedral environments due to the splitting of the Ga2 site into Ga2 and Ga3 sites...
January 18, 2010: Inorganic Chemistry
Mikhail Vasiliev, Mohammad Nur-E Alam, Viacheslav A Kotov, Kamal Alameh, Vladimir I Belotelov, Vladimir I Burkov, Anatoly K Zvezdin
Bismuth-substituted iron garnets are considered to be the most promising magneto-optical materials because of their excellent optical transparency and very high magneto-optical figures of merit in the near-infrared spectral region. However, the practical application of garnets in the visible and short-wavelength infrared parts of spectrum is currently limited, due to their very high optical absorption (especially in sputtered films) in these spectral regions. In this paper, we identify the likely source of excess absorption observed in sputtered garnet films in comparison with epitaxial layers and demonstrate (Bi,Dy)(3)(Fe,Ga)(5)O(12): Bi(2)O(3) composites possessing record MO quality in the visible region...
October 26, 2009: Optics Express
Chih-Chia Huang, Chia-Hao Su, Mei-Yi Liao, Chen-Sheng Yeh
The magneto-optical FeGa(2)O(4) nanoparticles with high Fe mass magnetization exhibited a high-performance T(2)-lowering effect and displayed cathodoluminescence.
August 14, 2009: Physical Chemistry Chemical Physics: PCCP
P N Perera, K R Fega, C Lawrence, E J Sundstrom, J Tomlinson-Phillips, Dor Ben-Amotz
We report the experimental observation of water dangling OH bonds in the hydration shells around dissolved nonpolar (hydrocarbon) groups. The results are obtained by combining vibrational (Raman) spectroscopy and multivariate curve resolution (MCR), to reveal a high-frequency OH stretch peak arising from the hydration shell around nonpolar (hydrocarbon) solute groups. The frequency and width of the observed peak is similar to that of dangling OH bonds previously detected at macroscopic air-water and oil-water interfaces...
July 28, 2009: Proceedings of the National Academy of Sciences of the United States of America
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