Artículos de revistas: "FEXI"

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Monge, Francisco Javier Carmona, Irene Álvarez Angorrilla, Elena Sánchez Aguado y Felisa Rodríguez Ruiz. "Ulceración rectal como una complicación del uso de sistema de control fecal Fexi-Seal: relato de casos". Revista da Escola de Enfermagem da USP 45, n.º 5 (octubre de 2011): 1256–59. http://dx.doi.org/10.1590/s0080-62342011000500032.

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El Sistema Fexi-Seal es un dispositivo desarrollado para proporcionar mejores cuidados a los pacientes críticos con incontinencia fecal. Existen trabajos que demuestran la seguridad y eficacia del dispositivo, siendo escasos los relatos relacionados con eventos adversos. El presente artículo presenta dos casos de pacientes críticos portadores de Fexi-Seal que desarrollaron complicaciones con su uso. El sistema se mostró eficaz para el tratamiento, sin embargo, es necesaria atención especial en su manejo, particularmente en cuanto al alivio periódico de la presión de la ampolla rectal y al posicionamiento correcto de la bolsa colectora en la cama para evitar tracción excesiva. El Sistema Flexi-Seal permite manejar adecuadamente la diarrea en pacientes críticos, mejorando su bienestar y disminuyendo las complicaciones asociadas a ella, aunque se torna necesario aumentar el conocimiento sobre las complicaciones relacionadas con su empleo.

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Pisharody, S., R. Phillips y C. M. Langton. "Sensitivity of proximal femoral stiffness and areal bone mineral density to changes in bone geometry and density". Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 222, n.º 3 (1 de marzo de 2008): 367–75. http://dx.doi.org/10.1243/09544119jeim307.

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Areal bone mineral density (aBMD) is the most common surrogate measurement for assessing the bone strength of the proximal femur associated with osteoporosis. Additional factors, however, contribute to the overall strength of the proximal femur, primarily the anatomical geometry. Finite element analysis (FEA) is an effective and widely used computer-based simulation technique for modelling mechanical loading of various engineering structures, providing predictions of displacement and induced stress distribution due to the applied load. FEA is therefore inherently dependent upon both density and anatomical geometry. FEA may be performed on both three-dimensional and two-dimensional models of the proximal femur derived from radiographic images, from which the mechanical stiffness may be predicted. It is examined whether the outcome measures of two-dimensional FEA, two-dimensional, finite element analysis of X-ray images (FEXI), and three-dimensional FEA computed stiffness values of the proximal femur are more sensitive than aBMD to changes in trabecular bone density and femur geometry. It is assumed that if an outcome measure follows known trends with changes in density and geometric parameters, then an increased sensitivity will be indicative of an improved prediction of bone strength. All three outcome measures increased non-linearly with trabecular bone density, increased linearly with cortical shell thickness and neck width, decreased linearly with neck length, and were relatively insensitive to neck-shaft angle. For femoral head radius, aBMD was relatively insensitive, with two-dimensional FEXI and three-dimensional FEA demonstrating a non-linear increase and decrease in sensitivity respectively. For neck anteversion, aBMD decreased non-linearly, whereas both two-dimensional FEXI and three-dimensional FEA demonstrated a parabolic-type relationship, with the maximum stiffness being achieved at an angle of approximately 15°. Multi-parameter analysis showed that all three outcome measures demonstrated their highest sensitivity to a change in cortical thickness. When changes in all input parameters were considered simultaneously, three and two-dimensional FEA had statistically equal sensitivities (0.41 ± 0.20 and 0.42 ± 0.16 respectively, p= ns) that were significantly higher than the sensitivity of aBMD (0.24 ± 0.07; p=0.014 and 0.002 for three-dimensional and two-dimensional FEA respectively). This simulation study suggests that since mechanical integrity and FEA are inherently dependent on anatomical geometry, FEXI stiffness, being derived from conventional two-dimensional radiographic images, may provide an improvement in the prediction of bone strength of the proximal femur than currently provided by aBMD.

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Tayal, S. S. "Effective Collision Strengths of Fine‐Structure Transitions in Fex, Fexi, and Fexiii". Astrophysical Journal 544, n.º 1 (20 de noviembre de 2000): 575–80. http://dx.doi.org/10.1086/317195.

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Gupta, G. P. y S. S. Tayal. "Effective Collision Strengths for Electron Impact Excitation of Fine‐Structure Levels in Fexi". Astrophysical Journal 510, n.º 2 (10 de enero de 1999): 1078–81. http://dx.doi.org/10.1086/306612.

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Bai, Ruiliang, Zhaoqing Li, Chaoliang Sun, Yi-Cheng Hsu, Hui Liang y Peter Basser. "Feasibility of filter-exchange imaging (FEXI) in measuring different exchange processes in human brain". NeuroImage 219 (octubre de 2020): 117039. http://dx.doi.org/10.1016/j.neuroimage.2020.117039.

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Pinfield, D. J., F. P. Keenan, M. Mathioudakis, K. G. Widing, P. T. Gallagher, G. P. Gupta, S. S. Tayal, R. J. Thomas y J. W. Brosius. "Electron Densities in the Coronae of the Sun and Procyon from Extreme‐Ultraviolet Emission Line Ratios in Fexi". Astrophysical Journal 562, n.º 1 (20 de noviembre de 2001): 566–74. http://dx.doi.org/10.1086/323465.

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Onsgard-Meyer, M. J., R. J. Kerrigan, M. Collins, A. A. Khraibi y F. G. Knox. "Phosphaturic effect of L-NMMA in the presence of parathyroid hormone". American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 271, n.º 6 (1 de diciembre de 1996): R1477—R1480. http://dx.doi.org/10.1152/ajpregu.1996.271.6.r1477.

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The objective of this study was to examine the effect of NG-monomethyl-L-arginine (L-NMMA) on phosphate excretion in the presence and absence of parathyroid hormone (PTH). Renal clearances were obtained before and during infusion of L-NMMA (15 mg/kg bolus and 500 micrograms.kg-1.min-1 infusion) in Sprague-Dawley rats with intact parathyroid glands (n = 6), in thyroparathyroidectomized (TPTX) rats receiving a constant infusion of PTH-(1-34) (0.01-0.03 U.kg-1.min-1) (n = 11) throughout the experiment, or in TPTX rats, that received an acute infusion of PTH-(1-34) (33 U/kg bolus and 1 U.kg-1.min-1 infusion) after L-NMMA infusion alone (n = 7). In rats with intact parathyroid glands, L-NMMA increased the fractional excretions of phosphate (FEPi) and sodium (FENa) and mean arterial pressure (MAP) (delta 8.6 +/- 1.5%, delta 0.62 +/- 0.1%, and delta 26.7 +/- 4.9 mmHg, respectively; P < 0.05). In TPTX rats receiving a constant infusion of PTH, L-NMMA again increased FEPi, FENa, and MAP (delta 9.5 +/- 3.6%, delta 1.1 +/- 0.4%, and delta 28.4 +/- 4.5 mmHg, respectively; P < 0.05). However, in TPTX rats, L-NMMA alone did not increase FEPi (delta 0.9 +/- 0.3%), whereas the subsequent infusion of PTH with L-NMMA increased FEPi (delta 15.6 +/- 3.1%; P < 0.05). In an additional group of intact and TPTX rats, the fractional excretion of lithium (FELi) was measured as an index of proximal reabsorption. L-NMMA increased FELi in intact rats (delta 13.2 +/- 2.6%; P < 0.05), but not in TPTX rats (delta 4.2 +/- 3.3%). In conclusion, L-NMMA increases phosphate excretion in association with increases in MAP and FENa, and this phosphaturic effect is dependent on the presence of PTH.

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8

Gąsior, W. y A. Dębski. "Enthalpy of Formation of Intermetallic Phases from Fe-Ni-Ti System. Comparative Studies / Entalpia Tworzenia Faz Międzymetalicznych Z Układu Fe-Ni-Ti. Studia Porównawcze". Archives of Metallurgy and Materials 57, n.º 4 (1 de diciembre de 2012): 1095–104. http://dx.doi.org/10.2478/v10172-012-0122-4.

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The solution calorimetric method was used for the measurement of the formation enthalpy of the binary FeTi and Fe2Ti intermetallic phases and of the FeNiTi2 phase from the region of the ternary B2 one. The FeNi and FeNiTi2 phases were prepared by levitation melting and the Fe2Ti phase - by melting the metals in a glove-box under high purity argon. The alloys obtained were identified by the X-ray diffraction analysis. The structural study of the alloys with the composition equal to the FeTi and Fe2Ti phase confirmed the mentioned phases mainly in the samples. In the case of the ternary alloy of the composition of the FeNiTi2 phase, a slight amount of iron was also found. The obtained values of the formation enthalpy equal as follows: -27.2±1.3 kJ/mole of atoms, -22.5±1.4 kJ/mole of atoms and -34.2±1.3 kJ/mole of atoms for the Fe2Ti, FeTi and FeNiTi2 phase, respectively.

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Kaito, Chihiro, Akihito Kumamoto, Ryoichi Ono, Yoshio Saito y Shigeru Morikawa. "Growth of Functional FeTi Clusters Covered with Carbon Layer". Research Letters in Nanotechnology 2008 (2008): 1–3. http://dx.doi.org/10.1155/2008/734940.

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FeTi clusters with a diameter of less than 10 nm and covered with a graphitic layer have been preferentially produced in an gas atmosphere at pressures of 10 and 26.6 kPa by the simultaneous evaporation of Fe and Ti wires from a concave carbon boat. To compare this result with cluster formation in an inert gas atmosphere, the result for an Ar gas pressure of 10 kPa is also discussed. The formation of disordered FeNi clusters predominately took place in an gas atmosphere.

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10

Mészáros, István y Gábor Vértesy. "Modelling of Normal Magnetization Curves of Soft Magnetic Alloys". Materials Science Forum 659 (septiembre de 2010): 429–34. http://dx.doi.org/10.4028/www.scientific.net/msf.659.429.

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In this paper, we present an application of the so-called hyperbolic model of magnetization. The model was modified and it was applied for nine different soft magnetic alloys. The tested samples were electro-technical steels (FeSi alloys) and a permalloy (FeNi alloy) with strongly different magnetic properties. Among them, there are top, medium and definitely poor quality soft magnetic materials as well. Their minor hysteresis loops and normal magnetization curves were measured by alternating current measurement. The hyperbolic model of magnetization was applied for the experimental normal magnetization curves. It was proved that the applied model is excellent for describing mathematically the experimental magnetization curves.

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Keuchguerian, Arek, Berline Mougang-Soume, Frank Schaper y Davit Zargarian. "Lactide polymerization with iron alkoxide complexes". Canadian Journal of Chemistry 93, n.º 6 (junio de 2015): 594–601. http://dx.doi.org/10.1139/cjc-2014-0561.

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This report presents the results of a study on the preparation of iron alkoxide complexes chelated by diiminopyridine ligands and their role in the room temperature polymerization of rac-lactide. Reaction of N,N′-(p-R-C6H4CH2)2-diiminopyridines (R = H (1), F (2)) with FeX2 (X = Cl, Br) yielded the homoleptic complexes [(1)2Fe][FeX4] or [(2)2Fe][FeX4], respectively. Treating the latter with Na[BPh4] afforded the anion exchange product [(2)2Fe][BPh4]2, which was characterized by 1H NMR and absorption spectroscopy, combustion analysis, and single crystal X-ray diffraction. Various attempts to grow crystals of [(1)2Fe][FeX4] and [(2)2Fe][FeX4] culminated in the isolation of single crystals of [(2)2Fe][Cl6Fe2O] that was characterized by X-ray diffraction. Attempted synthesis of well-defined, mononuclear alkoxide derivatives from [(1)2Fe]2+ or [(2)2Fe]2+ gave mostly intractable products, but in one case we obtained the crystallographically characterized sodium iron cluster Na4Fe2(OC6H4F)8(THF)2. An aryloxide derivative proved accessible by reaction of NaOC6H4F with the mono-ligand precursor LFeCl2 (L = N,N′-dimesityl-diiminopyridine), but characterization of LFe(OC6H4F)2 was limited to a single crystal X-ray diffraction analysis, owing to unsuccessful attempts at isolating pure samples. The difficulties encountered in the isolation of pure alkoxide derivatives prompted us to use in-situ generated LFe(OEt)2 for studying the polymerization of rac-lactide. This system was found to be moderately active at room temperature and with a slight preference for the formation of a heterotactic polymer (Pr = 0.54–0.65). Large polydispersities of 1.5–2.0 indicated the presence of transesterification side-reactions, which were confirmed by the presence of peaks with m/z = n 144 + M(EtOH) + M(Na+) and m/z = (n + 0.5) 144 + M(EtOH) + M(Na+) in MALDI-MS.

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Gu, Ming F., Tomer Holczer, Ehud Behar y Steven M. Kahn. "Inner‐Shell Absorption Lines of Fevi–Fexvi: A Many‐Body Perturbation Theory Approach". Astrophysical Journal 641, n.º 2 (20 de abril de 2006): 1227–32. http://dx.doi.org/10.1086/500640.

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Bittencourt, Sérgio Deitos, Roberto Luis Ribeiro Da Cas, Moises De Mattos Dias, Lirio Schaeffer, Philippe Pauletti, Fernando Martins Fernandes y Carlos Antônio Ferreira. "Estudo de motor universal com núcleos obtidos pelos processos da metalurgia do pó para utilização em furadeiras manuais". Tecno-Lógica 21, n.º 1 (9 de enero de 2017): 01. http://dx.doi.org/10.17058/tecnolog.v21i1.7527.

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Este trabalho teve por objetivo o estudo de ligas sinterizadas a partir de Fe puro, FeP, FeSi e FeNi obtidas a partir dos processos da Metalurgia do Pó para sua aplicação nos núcleos do rotor e estator de um motor universal, tendo como finalidade sua utilização em uma máquina furadeira manual. A pesquisa compreendeu a obtenção de curvas de histerese destas ligas, ensaios para avaliação de perdas elétricas e simulação em software de elementos finitos para obtenção de fluxo de entreferro e conjugado eletromagnético (torque). Os estudos teóricos foram realizados em um motor universal de topologia convencional e as simulações foram realizadas de forma a comparar este motor com os de núcleos fabricados a partir de chapas de aço laminadas.

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Zandoná, Vitor Caetano Almeida, Sergio Deitos Bittencourt, Moisés De Mattos Dias, Monir Goethel Borba, Eduardo Luis Schneider, José Carlos Krause de Verney, José Lesina Cézar, Luiz Carlos Gertz y Lirio Schaeffe. "ESTUDO DE MATERIAIS MAGNÉTICOS MACIOS SINTERIZADOS PARA APLICAÇÃO EM SERVOMOTORES". Revista Tecnologia e Tendências 11, n.º 1 (15 de septiembre de 2020): 170. http://dx.doi.org/10.25112/rtt.v11i1.2297.

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Resumo Este trabalho teve por objetivo o estudo de ligas sinterizadas a partir de Fe puro, FeP, FeSi e FeNi obtidas a partir do processo da Metalurgia do Pó e sua aplicação em núcleos de rotor e estator de servomotores, operando com corrente elétrica de armadura de alta freqüência, reduzindo assim, nestas frequências, as correntes parasitas, as quais causam perda de potência nestas máquinas. O estudo compreendeu obtenção de curvas de histerese destas diversas ligas, ensaios para avaliação de perdas elétricas e simulação em software de elementos finitos para obtenção de fluxo de entreferro e conjugado eletromagnético (torque). Os estudos teóricos e simulações foram realizados em um servomotor de topologia convencional e os testes foram realizados comparativamente a servomotores com núcleos obtidos a partir de chapas de aço laminadas. Nas simulações realizadas estaticamente, o torque instantâneo e o fluxo magnético no núcleo de Fe1%P resultaram valores próximos em relação às tradicionais chapas de aço laminadas. O núcleo de Fe1%P apresentou torque instantâneo de 1,59 N.m e fluxo magnético de 1,70 T e o núcleo de chapas de aço laminadas, respectivamente, 1,65 N.m e 1,66 T.Palavras-chave: Metalurgia do Pó. Servomotores. Simulação por elementos finitos. ABSTRACT This work aimed to study sintered alloys from pure Fe, FeP, FeSi and FeNi obtained by Powder Metallurgy process, and its application in rotor and stator cores of servomotors, operating with armature electric current in high frequency, thus reducing, in these frequencies, eddy currents, which cause loss of power in these machines. The study comprised obtaining hysteresis curves from these different alloys, tests to evaluate electrical losses and simulation in finite element software to obtain airflow and electromagnetic conjugate (torque). Theoretical studies and simulations were performed on a conventional topology of servomotor, and the tests were carried out comparatively to servomotors with cores obtained from rolled steel sheets. In the simulations performed statically, the instantaneous torque and the magnetic flux in the Fe1%P core resulted close values in relation to the traditional laminated steel sheets. The Fe1%P core had an instantaneous torque of 1.59 N.m and a magnetic flux of 1.70 T and the core of rolled steel sheets, respectively, 1.65 N.m and 1.66 T.Keywords: Powder Metallurgy. Servomotors. Finite Element Simulation.

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Chlenova, Anna A., Galina V. Kurlyandskaya, Stanislav O. Volchkov, Vladimir N. Lepalovskij y Rhimou El Kammouni. "Nanostructured Magnetoimpedance Multilayers with Different Thickness of FeNi Components". Solid State Phenomena 215 (abril de 2014): 342–47. http://dx.doi.org/10.4028/www.scientific.net/ssp.215.342.

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Magnetic properties and magnetoimpedance of [FeNi/Cu]n/FeNi/Cu (500 nm)/[FeNi/Cu]m/FeNi MI asymmetric and symmetric structures were studied for multilayeres with different thickness (25, 50 or 170 nm) of permalloy layers. The asymmetric structures in the case of FeNi layers of 50 nm show higher sensitivities comparing with symmetric structures. Asymmetric multilayered structures with 25 nm thick FeNi layers are an interesting subject for further investigation as the interactions between FeNi layers seem to be providing the best MI response.

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Xiao, Chen, Zhe Rui Huang, Qing Dong Zhong, Yu Lin Li, Jin Hu Sun y Hui Li. "Study on the Interfacial Binding Energy of Plasma Sprayed FeSi Nano-Composite Coating". Materials Science Forum 893 (marzo de 2017): 330–34. http://dx.doi.org/10.4028/www.scientific.net/msf.893.330.

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Plasma sprayed FeSi nanocomposite coating is used more and more widely, yet the cohesive force in nanocomposite coating on mild steel is still a problem to solve. This paper aimed to use MM simulation to estimate the cohesive strength. To simulate the interfacial binding energy in plasma sprayed FeSi nanocomposite coating on mild steel, different kinds of FeSi-Fe molecular models were built. The simulation results indicated that the mild steel supporting plasma sprayed FeSi nanocomposite coating showed a higher cohesive strength with moderate thickness and thermal treated of FeSi. In the system of FeSi-Fe, the separation will take place between FeSi and Fe layer, the best thickness of plasma sprayed FeSi nanocomposite coating is about 6μm, and thermal treated under hydrogen atmosphere is about 1400K. The results of MM simulation provide some theoretical basis for preparation of plasma sprayed FeSi nanocomposite coating on mild steel with advanced cohesive strength.

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Porsch, Katharina y Andreas Kappler. "FeII oxidation by molecular O2 during HCl extraction". Environmental Chemistry 8, n.º 2 (2011): 190. http://dx.doi.org/10.1071/en10125.

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Environmental contextIn the environment, iron exists mainly as FeII and FeIII and plays an important role in biogeochemical processes. The FeII and FeIII content is often quantified by hydrochloric acid extraction and the acid is thought to prevent FeII oxidation by oxygen. However, we found that with increasing HCl concentration and temperature, oxidation of FeII by oxygen is accelerated. Therefore, in order to obtain reliable results extractions should be performed with dilute HCl or in the absence of oxygen. AbstractHCl is commonly used to stabilise FeII under oxic conditions and is often included in Fe extractions. Although FeII oxidation by molecular O2 in HCl is described in the field of hydrometallurgy, this phenomenon has not been systematically studied in environmentally relevant systems. The extent of FeII oxidation by O2 during extraction of soils and magnetite by HCl and in HCl/FeCl2 solutions was therefore quantified. FeII was stable in 1 M HCl at room temperature for several days, whereas in 6 M HCl at 70°C, 90% of the FeII was oxidised within 24 h. In the absence of O2, no FeII oxidation occurred. Experiments at low pH with increasing H+ or Cl– concentration alone and geochemical modelling suggested that the formation of complexes of FeII and HCl may be responsible for the observed FeII oxidation. The use of strictly anoxic conditions for Fe extraction by HCl to obtain reliable Fe redox speciation data is therefore recommended.

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Hasegawa, M., T. Hayashi, T. Sasaki y M. Iwase. "Activities of FexO in Na2O-Al2O3-SiO2-FexO Homogeneous Liquid Slags at 1673 K". High Temperature Materials and Processes 31, n.º 4-5 (30 de octubre de 2012): 415–20. http://dx.doi.org/10.1515/htmp-2012-0076.

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AbstractElectrochemical measurements of the solid-oxide galvanic cell of the type Mo/Mo + MoO2/ZrO2 (MgO)/Fe + {Na2O-Al2O3-SiO2-FexO} slag/Ag/Fe were conducted at 1673 K in order to obtain the activities of FexO in Na2O-Al2O3-SiO2-FexO system. The iso-activity curves for FexO at 1673 K were determined for Na2O-(Al2O3 + SiO2)-FexO pseudo-ternary slags with an Al2O3/SiO2 molar ratio of 33/67.

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Mahren, Susanne y Volkmar Braun. "The FecI Extracytoplasmic-Function Sigma Factor of Escherichia coli Interacts with the β′ Subunit of RNA Polymerase". Journal of Bacteriology 185, n.º 6 (15 de marzo de 2003): 1796–802. http://dx.doi.org/10.1128/jb.185.6.1796-1802.2003.

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ABSTRACT Transcription of the ferric citrate transport system of Escherichia coli K-12 is mediated by the extracytoplasmic-function (ECF) sigma factor FecI, which is activated by ferric citrate in the growth medium. By using a bacterial two-hybrid system, it was shown in vivo that FecI binds to the β′ subunit of RNA polymerase. The inactive mutant protein FecI(K155E) displayed reduced binding to β′, and small deletions along the entire FecI protein led to total impairment of β′ binding. In vitro, FecI was retained on Ni2+-nitrilotriacetic acid agarose loaded with a His-tagged β′1-313 fragment and coeluted with β′1-313. Binding of FecI to β′ and β′1-313 was enhanced by FecR1-85, which represents the cytoplasmic portion of the FecR protein that transmits the inducing signal across the cytoplasmic membrane. Interaction of FecR with FecI was demonstrated by showing that isolated FecR inhibited degradation of FecI by trypsin. This is the first demonstration of binding of an ECF sigma factor of the FecI type to the β′ subunit of RNA polymerase and of binding being enhanced by the protein that activates the ECF sigma factor.

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Mahren, Susanne, Sabine Enz y Volkmar Braun. "Functional Interaction of Region 4 of the Extracytoplasmic Function Sigma Factor FecI with the Cytoplasmic Portion of the FecR Transmembrane Protein of the Escherichia coli Ferric Citrate Transport System". Journal of Bacteriology 184, n.º 13 (1 de julio de 2002): 3704–11. http://dx.doi.org/10.1128/jb.184.13.3704-3711.2002.

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ABSTRACT Transcriptional regulation of the ferric citrate transport genes of Escherichia coli is initiated by the binding of ferric citrate to the outer membrane protein FecA. This binding elicits a signal that is transmitted by FecR across the cytoplasmic membrane into the cytoplasm, where the sigma factor FecI directs the RNA polymerase to the promoter upstream of the fecABCDE genes. An in vivo deletion analysis using a bacterial two-hybrid system assigned the interaction of the FecR and FecI proteins to the cytoplasmic portion of the FecR transmembrane protein and region 4 of FecI. Missense mutations randomly generated by PCR were localized to region 4 of FecI, and the mutants were impaired with regard to the interaction of FecR with FecI and fecB-lacZ transcription. The cloned region 4 of FecI interfered with fecB-lacZ transcription. Interaction of N-proximal regions of predicted FecR homologs with region 4 of predicted FecI homologs of Pseudomonas aeruginosa was demonstrated. The interaction was specific in that only cognate protein pairs interacted with each other; no interactions occurred between heterologous combinations of the P. aeruginosa proteins and between a P. aeruginosa FecI homolog and E. coli FecR. The results demonstrate that region 4 of FecI specifically binds FecR and that this binding is necessary for FecI to function as a sigma factor.

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Wang, Zhen, Fenglong Wang, Zhaoyang Hou, Chunlong Xu y Derang Cao. "Static and Dynamic Magnetic Properties of FeGa/FeNi (FeNi/FeGa) Bilayer Structures". Coatings 10, n.º 4 (14 de abril de 2020): 383. http://dx.doi.org/10.3390/coatings10040383.

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FeGa/FeNi bilayer structures with different deposition order were fabricated by the electrodeposition method on indium tin oxide (ITO) substrates. The structure, morphology, static and dynamic magnetic properties of FeGa/FeNi (FeNi/FeGa) films were investigated. The bilayer structures exhibit extremely various magnetic properties with different deposition order which could be attributed to the different coupling interaction in the interface. When FeGa is on top, the bilayer structures show lower coercivity than when FeNi is on top. Meanwhile, increase of the proportion of FeNi in the bilayer structure could affect the Hc and Mr/Ms. The ferromagnetic resonance peak of FeGa on top moves to a high field compared with FeNi on top. Moreover, FeGa on top shows improved complex permeability and a clear resonant phenomenon of the magnetization. These properties make FeGa/FeNi bilayer structure a potential candidate for high-frequency application.

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Yang, Ming-Lin y Xin-Qing Sheng. "On the Finite Element Tearing and Interconnecting Method for Scattering by Large 3D Inhomogeneous Targets". International Journal of Antennas and Propagation 2012 (2012): 1–6. http://dx.doi.org/10.1155/2012/898247.

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The finite element tearing and interconnecting method (FETI) is applied to compute scattering by large 3D inhomogeneous targets. Two algorithms of FETI have been implemented for 3D scattering. The performance of these two FETI algorithms has been investigated in detail, particularly for large inhomogeneous targets. Numerical experiments show that the performance of FETI relies on the style of domain decomposition and inhomogeneity, which has not been carefully studied before. A trick for improving convergence of FETI is presented for inhomogeneous targets.

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Handzlik, Gabriela y Dawid Pinkowicz. "How to Make a Better Magnet? Insertion of Additional Bridging Ligands into a Magnetic Coordination Polymer". Magnetochemistry 4, n.º 3 (15 de septiembre de 2018): 41. http://dx.doi.org/10.3390/magnetochemistry4030041.

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A three-dimensional cyanide-bridged coordination polymer based on FeII (S = 2) and NbIV (S = 1/2) {[FeII(H2O)2]2[NbIV(CN)8]·4H2O}n (Fe2Nb) was modified at the self-assembly stage by inserting an additional formate HCOO− bridge into its cyanide framework. The resulting mixed-bridged {(NH4)[(H2O)FeII-(μ-HCOO)-FeII(H2O)][NbIV(CN)8]·3H2O}n (Fe2NbHCOO) exhibited additional FeII-HCOO-FeII structural motifs connecting each of the two FeII centers. The insertion of HCOO− was possible due to the substitution of some of the aqua ligands and crystallization water molecules in the parent framework by formate anions and ammonium cations. The formate molecular bridge not only shortened the distance between FeII ions in Fe2NbHCOO from 6.609 Å to 6.141 Å, but also created additional magnetic interaction pathways between the magnetic centers, resulting in an increase in the long range magnetic ordering temperature from 43 K for Fe2Nb to 58 K. The mixed-bridged Fe2NbHCOO also showed a much broader magnetic hysteresis loop of 0.102 T, compared to 0.013 T for Fe2Nb.

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24

Scheriau, Stephan, K. Rumpf, Siegfried Kleber y Reinhard Pippan. "Tailoring the Magnetic Properties of Ferritic Alloys by HPT". Materials Science Forum 584-586 (junio de 2008): 923–28. http://dx.doi.org/10.4028/www.scientific.net/msf.584-586.923.

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Industrial available FeSi, FeCo and FeNi alloys with an initial grain size of 20-50 m were subjected to Severe Plastic Deformation (SPD) up to strain levels where a saturation of the microstructural refinement is observed. For both SPD conditions, ambient temperature (293 K) and liquid nitrogen temperature (77 K), the microstructure of the severely deformed state is analysed by Back Scattered Electrons (BSE) micrographs captured in a SEM. Additionally, samples that were deformed at 77 K are examined in a Transmission Electron Microscope (TEM). The magnetic properties were characterised by means of SQUID-magnetography providing information about the magnetization behaviour of the material in the as-processed state. Depending on the SPD conditions the mean microstructural sizes in the steady state are about 100-150 nm and 30-80 nm at 293 K and 77 K, respectively. The small microstructural sizes influence significantly the magnetic properties of these ferritic alloys. The initial soft-magnetic behaviour of the coarse grained state shifts towards a hard-magnetic with decreasing crystallite size. For crystallite sizes smaller than ~80 nm the magnetic properties become again more soft-magnetic. The experiments show that very low coercitivity can be obtained by SPD if the grain size is smaller than ~50 nm.

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25

Parker, D. y P. L. Newland. "Cholinergic synaptic transmission between proprioceptive afferents and a hind leg motor neuron in the locust". Journal of Neurophysiology 73, n.º 2 (1 de febrero de 1995): 586–94. http://dx.doi.org/10.1152/jn.1995.73.2.586.

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1. The physiology and pharmacology of the connections made by stress-sensitive campaniform sensilla on the proximal dorsal tibia of a locust hind leg with a fast extensor tibiae motor neuron (FETi) have been examined. 2. Mechanical stimulation of a campaniform sensillum on the anterior surface of the tibia elicited bursts of spikes in its afferent and a depolarization in FETi. Each afferent spike was followed at short and constant latency by an excitatory postsynaptic potential (EPSP) in FETi, even at high-frequency stimulation. Electrical stimulation of the extensor tibiae muscle with the tibia fixed elicited an antidromic spike in FETi followed by a compound potential which resulted from the activation of the campaniform sensillum afferent. The connections between the campaniform sensillum and FETi was monosynaptic and chemically mediated. 3. Ionophoresis of ACh into the neuropil depolarized FETi, as did the application of the cholinesterase inhibitor physostigmine. Bath application of the cholinergic agonists, nicotine and muscarine, also depolarized FETi, with nicotine causing a reduction in input resistance, while muscarine caused no detectable change in input resistance. Muscarine and the muscarinic agonist oxotremorine also caused rhythmic depolarizations and bursts of spikes in FETi. These effects were seen in low calcium/high magnesium saline to block synaptic transmission and are therefore due to direct effects on FETi. FETi therefore appears to have both nicotinic and muscarinic receptors. 4. The compound potential in FETi, caused by activation of the campaniform sensillum, was reduced by bath application of nicotinic cholinergic antagonists. However, the muscarinic antagonist scopolamine increased the amplitude of the compound potential.(ABSTRACT TRUNCATED AT 250 WORDS)

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26

Barrera, L. H., J. Dachs y T. W. Berghöfer. "FeII, FeIII and MgII spectra of Be stars". Symposium - International Astronomical Union 162 (1994): 267–68. http://dx.doi.org/10.1017/s0074180900215027.

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For a total of 33 bright Be stars, archival high-dispersion spectrograms obtained by the International Ultraviolet Explorer (IUE) satellite were analyzed together with optical spectrograms in order to study the FeII, FeIII and MgII spectra in the entire 1600 Å to 6500 Å wavelength range. Ultraviolet FeII resonance lines are always found to be in absorption which usually is of interstellar origin. By applying curve-of-growth methods to equivalent widths measured for FeII multiplets UV-1 through UV-8, column densities of interstellar FeII are derived ranging typically between about 1014 and 1015 cm-2. For a few program stars showing shell-type spectra in the optical region, additional FeII resonance absorption lines are detected starting from excited fine-structure levels above the ground state, pointing to FeII absorption occurring in the dense circumstellar envelope in front of these star. Analysis of their equivalent widths is used to infer typical column densities of circumstellar ground state FeII ions of order 1015 cm-2.

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27

Kurlyandskaya, G. V., S. M. Bhagat, Andrey V. Svalov, Eduardo Fernandez, Alfredo García-Arribas y José M. Barandiarán. "FeNi-Based Film Nanostructures for High Frequency Applications: Design and Characterization". Solid State Phenomena 168-169 (diciembre de 2010): 257–60. http://dx.doi.org/10.4028/www.scientific.net/ssp.168-169.257.

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FeNi films were deposited by DC magnetron sputtering at different Ar pressures. The structure and magnetic properties of the FeNi films are affected by the Ar pressure. Ferromagnetic resonance (FMR) measurements were done at a frequency of about 8.85 GHz. Both the value of resonance field and resonance line width show strong dependence on the Ar pressure: the lowest value of the resonance field and the narrowest resonance width correspond to the smallest argon pressure. Increase of the Ar pressure causes the films to have a significant perpendicular anisotropy with the easy axis pointing out of the plane. The magnetic properties and FMR were also studied for the [FeNi(170 nm)/Ti]n/FeNi(170 nm) (n = 1, 2, 5) structures prepared at the smallest Ar pressure. The FMR studies showed that the obtained multilayers are very robust: the value of the resonance field and resonance line width of the [FeNi/Ti]n/FeNi multilayers are very close to the corresponding values for the FeNi films.

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28

Svalov, A. V., G. V. Kurlyandskaya, V. N. Lepalovskij, P. A. Savin y V. O. Vas’kovskiy. "Exchange bias in FeNi/FeMn/FeNi multilayers". Superlattices and Microstructures 83 (julio de 2015): 216–23. http://dx.doi.org/10.1016/j.spmi.2015.03.040.

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29

Patrin, G. S., V. Yu Yakovchuk, D. A. Velikanov, K. G. Patrin y S. A. Yarikov. "Interlayer interactions in FeNi/Bi/FeNi trilayers". Bulletin of the Russian Academy of Sciences: Physics 76, n.º 2 (febrero de 2012): 177–79. http://dx.doi.org/10.3103/s1062873812020207.

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30

Patrin, K. G., S. A. Yarikov, V. Yu Yakovchuk, G. S. Patrin, Yu P. Salomatov y V. G. Plekhanov. "Magnetic resonance in FeNi/Bi/FeNi films". Technical Physics Letters 41, n.º 11 (noviembre de 2015): 1091–93. http://dx.doi.org/10.1134/s1063785015110231.

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31

Vočadlo, Lidunka, Geoffrey D. Price y I. G. Wood. "Crystal structure, compressibility and possible phase transitions in \boldvarepsilon-FeSi studied by first-principles pseudopotential calculations". Acta Crystallographica Section B Structural Science 55, n.º 4 (1 de agosto de 1999): 484–93. http://dx.doi.org/10.1107/s0108768199001214.

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An investigation of the relative stability of the FeSi structure and of some hypothetical polymorphs of FeSi has been made by first-principles pseudopotential calculations. It has been shown that the observed distortion from ideal sevenfold coordination is essential in stabilizing the FeSi structure relative to one of the CsCl type. Application of high pressure to FeSi is predicted to produce a structure having nearly perfect sevenfold coordination. However, it appears that FeSi having a CsCl-type structure will be the thermodynamically most stable phase for pressures greater than 13 GPa. Fitting of the calculated internal energy vs volume for the FeSi structure to a third-order Birch–Murnaghan equation of state led to values, at T = 0 K, for the bulk modulus, K 0, and for its first derivative with respect to pressure, K 0′, of 227 GPa and 3.9, respectively.

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32

WANG, PANGPANG, LUMEI GAO, LIQUN WANG, DONGYAN ZHANG, SEN YANG, XIAOPING SONG, ZHIYONG QIU y RI-ICHI MURAKAMI. "MAGNETIC PROPERTIES OF FENI NANOWIRE ARRAYS ASSEMBLED ON POROUS AAO TEMPLATE BY AC ELECTRODEPOSITION". International Journal of Modern Physics B 24, n.º 15n16 (30 de junio de 2010): 2302–7. http://dx.doi.org/10.1142/s0217979210064836.

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FeNi nanowire arrays were fabricated into the pores of porous alumina template by a simple alternating current electrodeposition method in this work. FeNi nanowires with different diameters were obtained depending on the pore size arrangement of alumina templates. FeNi nanowire arrays exhibited obviously magnetic anisotropy, and the easy axis was along the nanowires. When the applied magnetic field was parallel to the nanowires, the coercivity (Hc) and the maximum remnant ratio (Mr/Ms) are considerable higher than those while the magnetic field perpendicular to the nanowires. FeNi nanowires prepared in this work are expected to be utilized as the perpendicular magnetic recording media. The magnetic domain structure and the magnetizing mechanism of FeNi nanowires were also been discussed.

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33

Yeh, Chun-Liang y Kuan-Ting Chen. "Synthesis of FeSi-Al2O3 Composites by Autowave Combustion with Metallothermic Reduction". Metals 11, n.º 2 (3 de febrero de 2021): 258. http://dx.doi.org/10.3390/met11020258.

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Fabrication of FeSi-Al2O3 composites with a molar ratio of FeSi/Al2O3 ranging from 1.2 to 4.5 was conducted by the self-propagating high-temperature synthesis (SHS) method. The synthesis reaction involved metallothermic reduction of Fe2O3 and SiO2 by Al and the chemical interaction of Fe and Si. Two combustion systems were examined: one contained thermite reagents of 0.6Fe2O3 + 0.6SiO2 + 2Al, and the other had Fe2O3 + 2Al to mix with different amounts of Fe and Si powders. A thermodynamic analysis indicated that metallothermic reduction of oxide precursors was sufficiently exothermic to sustain the combustion reaction in a self-propagating mode. The SHS reaction carrying out co-reduction of Fe2O3 and SiO2 was less exothermic, and was applied to synthesize products with FeSi/Al2O3 = 1.2–2.5, while the reaction reducing only Fe2O3 was more energetic and was adopted for the composites with FeSi/Al2O3 = 2.5–4.5. Moreover, the former had a larger activation energy, i.e., Ea = 215.3 kJ/mol, than the latter, i.e., Ea = 180.4 kJ/mol. For both reaction systems, the combustion wave velocity and temperature decreased with increasing FeSi content. Formation of FeSi-Al2O3 in situ composites with different amounts of FeSi was achieved. Additionally, a trivial amount of aluminum silicate was detected in the products of high FeSi contents due to dissolution of Si into Al2O3 during the SHS process.

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34

Kurlyandskaya, G. V., L. Elbaile, F. Alves, B. Ahamada, R. Barrué, A. V. Svalov y V. O. Vas kovskiy. "Domain structure and magnetization process of a giant magnetoimpedance geometry FeNi/Cu/FeNi(Cu)FeNi/Cu/FeNi sensitive element". Journal of Physics: Condensed Matter 16, n.º 36 (28 de agosto de 2004): 6561–68. http://dx.doi.org/10.1088/0953-8984/16/36/021.

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35

Stan, Stelian, Iulian Riposan, Mihai Chisamera y Michael Barstow. "Undesirable Graphite Morphologies Incidence in Inoculated Grey Irons". Advanced Materials Research 23 (octubre de 2007): 307–10. http://dx.doi.org/10.4028/www.scientific.net/amr.23.307.

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Successful inoculation is not guaranteed and effects may even be deleterious. The main risks are the appearance of types B and D graphite, associated with ferrite and/or carbides due to lack of control of undercooling during eutectic solidification. Alternatively coarse type C graphite in hypo to eutectic grey irons may result from inadequate or excessive inoculation. Sulphur and aluminium content in a molten iron are considered to be the main factors to control the degree of eutectic undercooling, graphite morphology and inoculation efficiency. Thermal conditions, such as superheating, inoculation and pouring temperature play an important role in controlling these effects. Cooling rates due to different mould materials and casting thickness were also considered. In order to resolve individual problems, different inoculant systems have to be considered, such as Sr-FeSi, Ca-FeSi, Ti,Ca-FeSi, Zr,Ca-FeSi, Ba,Ca-FeSi, RE-FeSi (Ca). The present paper made a synthesis of other published papers by the authors, but also added many original un-published results.

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36

Hoppe, A., A. Rybczynska, F. G. Knox y S. Angielski. "Beta-receptors in resistance to phosphaturic effect of PTH in respiratory alkalosis". American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 255, n.º 4 (1 de octubre de 1988): R557—R562. http://dx.doi.org/10.1152/ajpregu.1988.255.4.r557.

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Respiratory alkalosis results in a resistance to the phosphaturic effect of parathyroid hormone (PTH) and dibutyryl adenosine 3',5'-cyclic monophosphate (cAMP). The present studies evaluated the role of the beta-adrenergic system in that resistance phenomenon. In clearance experiments on acutely thyroparathyroidectomized male Wistar rats, respiratory alkalosis blunted the PTH-mediated increase in absolute and fractional excretion of phosphate (FEPi). Propranolol infusion restored the phosphaturic response to PTH:FEPi, 0.8 +/- 0.3 vs. 8.1 +/- 2.5% (P less than 0.005). Similarly, the increase of FEPi during cAMP infusion was also diminished by respiratory alkalosis: FEPi, 15.5 +/- 2.2 vs. 5.5 +/- 1.1% (P less than 0.005). This hypophosphaturic effect of respiratory alkalosis in the presence of cAMP was not observed in rats infused with propranolol compared with the period of normal ventilation: FEPi, 21.1 +/- 1.7 vs. 15.3 +/- 1.6 (P less than 0.02). Also, during the infusion of the highly selective beta 2-adrenoceptor antagonist, ICI 118,551, cAMP was phosphaturic in respiratory alkalosis compared with FEPi in the absence of the antagonist: FEPi, 13.0 +/- 2.5 vs. 5.5 +/- 1.1% (P less than 0.02). Finally, the infusion of the beta 2-agonist, fenoterol, to the normally ventilated rats significantly decreased FEPi in cAMP-infused rats in comparison to the absence of the agonist: FEPi, 4.0 +/- 0.7 vs. 22.1 +/- 2.6% (P less than 0.001). We conclude that the resistance to the phosphaturic effect of PTH and cAMP in respiratory alkalosis is mediated by beta-adrenoceptors.

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37

Steinhäuslin, F., M. Burnier, J. L. Magnin, A. Munafo, T. Buclin, J. Diezi y J. Biollaz. "Fractional excretion of trace lithium and uric acid in acute renal failure." Journal of the American Society of Nephrology 4, n.º 7 (enero de 1994): 1429–37. http://dx.doi.org/10.1681/asn.v471429.

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The early distinction between prerenal azotemia, characterized by an avid proximal tubular sodium reabsorption, and ATN, in which proximal tubule function is depressed, remains an important but difficult clinical task. Indices of acute renal failure based on urinary sodium excretion may be helpful but have several limitations, among which is the use of diuretics. The effectiveness of the fractional excretion of uric acid (FEUA) and that of endogenous lithium (FELi) in the diagnosis of acute renal failure has been evaluated in an unselected group of 46 patients, 28 with prerenal azotemia and 18 with ATN. In the entire group, FELi concurred with the clinical diagnosis in 78% of the patients, whereas the fractional excretion of sodium (FENa) and FEUA were in agreement in only 63 and 50%, respectively. FELi was more sensitive to identify hemodynamic renal failure, because 93% of prerenal failure patients had a low FELi, contrasting with a low FEUA in only 68% and a low FENa in 75%. The major reason for the discrepancy between FENa and FELi was the administration of diuretics. In both acute renal failure groups, FENa was higher in the subgroups receiving diuretics. In contrast, diuretic therapy had no effect on FELi in either group. These results suggest that FELi is more accurate than either FENa or FEUA for distinguishing prerenal azotemia from ATN. The superiority of FELi appears especially relevant in patients treated with the usual diuretics.

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38

Fras, Ana. "Feri Lainšček". Verba Hispanica 24, n.º 1 (29 de diciembre de 2016): 5–6. http://dx.doi.org/10.4312/vh.24.1.5-6.

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Feri Lainšček, escritor, poeta, dramático y escenógrafo, vive y trabaja en Murska Sobota. Es oriundo de la región de Prekmurje, en la parte este del país que colinda con Hungría, Austria y Croacia, uno de los lugares más peculiares y menos conocidos de Eslovenia. Esa llanura tan típica de la región (ravnica) ha marcado en gran medida su literatura, como puede apreciarse en la mayoría de sus novelas.

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39

Sanati, Abdi. "Femi Oyebode". BJPsych Bulletin 45, n.º 1 (28 de enero de 2021): 66–68. http://dx.doi.org/10.1192/bjb.2020.123.

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40

Indra, Indra budaya. "PENGARUH KUALITAS PELAYANAN, KUALITAS PRODUK DAN KEPERCAYAAN TERHADAP KEPUASAN KONSUMEN PADA SALON FERI PELAMINAN". JURNAL ADMINISTRASI NUSANTARA 2, n.º 2 (31 de diciembre de 2019): 1–19. http://dx.doi.org/10.51279/jan.v2i2.32.

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Tujuannya adalah untuk mengetahui apakah kualitas pelayanan berpengaruh terhadap kepuasan konsumen pada salon feri pelaminan, untuk mengetahui apakah kualitas produk berpengaruh terhadap kepuasan konsumen pada salon feri pelaminan, untuk mengetahui apakah kepercayaan berpengaruh terhadap kepuasan konsumen pada salon feri pelaminan, untuk mengetahui apakah kualitas pelayanan, kualitas produk dan kepercayaan berpengaruh terhadap kepuasan konsumen pada salon feri pelaminan dan berapa besar pengaruhnya tersebut, untuk mengetahui berapa besar pengaruh kualitas pelayanan, kualitas produk dan kepercayaan terhadap kepuasan konsumen pada salon feri pelaminan. Hasil dari penelitian ini adalah secara parsial terdapat pengaruh antara kualitas pelayanan (x1) terhadap kepuasan konsumen (y) feri pelaminan. Pengujian hubungan kedua variabel tersebut menunjukkan nilai thitung = = 3,092 ( t tabel > 1.985) dengan signifikan = 0,028 (signifikan < 0,05). Jadi dapat disimpulkan bahwa kualitas pelayanan (x1) berpengaruh positif terhadap kepuasan konsumen (y), sehingga semakin tinggi nilai kualitas pelayanan (x1) yang dimiliki oleh feri pelaminan maka kepuasan konsumen (y) akan semakin tinggi juga. Secara parsial terdapat pengaruh antara kualitas produk (x2) terhadap kepuasan konsumen (y) feri pelaminan. Pengujian hubungan kedua variabel tersebut menunjukkan nilai thitung = (-3,925) ( t tabel > -1.985) dengan signifikan = 0,000 (signifikan < 0,05). Jadi dapat disimpulkan bahwa kualitas produk (x2) berpengaruh negatif terhadap kepuasan konsumen (y), sehingga semakin menurunnya kualitas produk (x2) yang dimiliki oleh feri pelaminan maka kepuasan konsumen (y) akan semakin turun juga. Secara parsial tidak pengaruh antara kepercayaan (x3) terhadap kepuasan konsumen (y) feri pelaminan. Pengujian hubungan kedua variabel tersebut menunjukkan nilai thitung = 0,018 ( ttabel < 1.985) dengan signifikan = 0,986 (signifikan > 0,05). Jadi dapat disimpulkan bahwa kepercayaan (x3) tidak berpengaruh terhadap kepuasan konsumen (y), artinya dalam penetapan kepercayaan feri pelaminan tidak akan menurunkan atau meningkatakan kepuasan konsumen (y) Secara simultan terdapat pengaruh antara kualitas pelayanan (x1), kualitas produk (x2) dan kepercayaan (x3) terhadap kepuasan konsumen (y) pengujian hubungan antar variabel secara simultan tersebut menunjukkan nilai fhitung = 5,550 ( f tabel > 2.70) dengan signifikan = 0,002 (signifikan < 0,05). Jadi dapat disimpulkan bahwa kualitas pelayanan (x1), kualitas produk (x2) dan kepercayaan (x3), berepengaruh terhadap kepuasan konsumen (y). Besar pengaruh secara simultan yaitu 26,6% sedangkan sisanya 84,4 % dipengaruhi oleh variabel lain yang tidak di teliti. Jadi dapat disimpulkan bahwa kualitas pelayanan (x1) kualitas produk (x2) dan kepercayaan (x3), mempunyai pengaruh positif yang lemah terhadap kepuasan konsumen (y).

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41

Pandya, N. Y., A. D. Mevada y P. N. Gajjar. "Effect of Temperature/Pressure on Lattice Dynamics of FeNi". Advanced Materials Research 1141 (agosto de 2016): 84–90. http://dx.doi.org/10.4028/www.scientific.net/amr.1141.84.

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Tetratenite phase of L10 (CuAu) FeNi is identified as a hard ferromagnet in spite of that common FeNi alloys are classified as a soft magnet. Due to its strong magnetic anisotropy and large coercivity, tetrataenite phase of L10 FeNi is under investigation as a rare earth free advanced permanent magnet. Our computed equilibrium lattice constant and c/a ratio for tetratenite phase of L10 (CuAu) FeNi are in 10 % deviation with the other available results. The vibrational and electronic properties of L10 FeNi at finite temperatures/pressures are studied using the first-principles plane wave self-consistent method under the framework of density functional theory. Conclusions based on the phonon dispersion curves, phonon density of states and electronic band structure along with total and projected density of states at finite temperatures/pressures are outlined.

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42

Stiefel, Alfred, Susanne Mahren, Martina Ochs, Petra T. Schindler, Sabine Enz y Volkmar Braun. "Control of the Ferric Citrate Transport System ofEscherichia coli: Mutations in Region 2.1 of the FecI Extracytoplasmic-Function Sigma Factor Suppress Mutations in the FecR Transmembrane Regulatory Protein". Journal of Bacteriology 183, n.º 1 (1 de enero de 2001): 162–70. http://dx.doi.org/10.1128/jb.183.1.162-170.2001.

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ABSTRACT Transcription of the ferric citrate transport genes is initiated by binding of ferric citrate to the FecA protein in the outer membrane ofEscherichia coli K-12. Bound ferric citrate does not have to be transported but initiates a signal that is transmitted by FecA across the outer membrane and by FecR across the cytoplasmic membrane into the cytoplasm, where the FecI extracytoplasmic-function (ECF) sigma factor becomes active. In this study, we isolated transcription initiation-negative missense mutants in the cytoplasmic region of FecR that were located at four sites, L13Q, W19R, W39R, and W50R, which are highly conserved in FecR-like open reading frames of thePseudomonas aeruginosa, Pseudomonas putida,Bordetella pertussis, Bordetella bronchiseptica, and Caulobacter crescentus genomes. The cytoplasmic portion of the FecR mutant proteins, FecR1–85, did not interact with wild-type FecI, in contrast to wild-type FecR1–85, which induced FecI-mediated fecB transport gene transcription. Two missense mutations in region 2.1 of FecI, S15A and H20E, partially restored induction of ferric citrate transport gene induction of thefecR mutants by ferric citrate. Region 2.1 of ς70 is thought to bind RNA polymerase core enzyme; the residual activity of mutated FecI in the absence of FecR, however, was not higher than that of wild-type FecI. In addition, missense mutations in the fecI promoter region resulted in a twofold increased transcription in fecR wild-type cells and a partial restoration of fec transport gene transcription in thefecR mutants. The mutations reduced binding of the Fe2+ Fur repressor and as a consequence enhancedfecI transcription. The data reveal properties of the FecI ECF factor distinct from those of ς70 and further support the novel transcription initiation model in which the cytoplasmic portion of FecR is important for FecI activity.

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43

Rilda, Yetria, Syukri Arief, Abdi Dharma y Admin Alif. "Modifikasi dan Karakterisasi Titania (M-TiO2) Dengan Doping Ion Logam Transisi Feni dan Cuni". Jurnal Natur Indonesia 12, n.º 2 (21 de noviembre de 2012): 178. http://dx.doi.org/10.31258/jnat.12.2.178-185.

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Structure and size of titania nanoparticles have been modified with doping the transition metal (FeNiand CuNi) and controlling the calcinations temperature. Gel and M-TiO 2 powder were characterized byFT-IR showed the changed in intensity at 4000-400 cm-1. TG-DTA curve show the weigh of sample wasdecreased with the increasing of temperature 25-800°C. XRD pattern used to identify the titania structureshows the highest intensity of anatase at temperature calcination as 500°C. XRD of FeNi-TiO 2 and CuNi-TiO2 FeNi 10.5-41.9 nm and CuNi 12.1-33.5 converted using Debye-Scherrer’s equation and TEM analysisthe distribution of crystal size as FeNi-TiO2 and CuNi-TiO2 10-15 nm. SEM has shown that morphology ofdifferent surface from the FeNi-TiO 2 and CuNi-TiO 2 at different calcinations temperatures. Titaniacomposition can be determined by EDX analysis give as FeNi-TiO2 1:1, 97.01% and CuNi-TiO2 1:1, 94.63%respectly. The surface area has been determined by BET as FeNi-TiO 2 was 64.38 m2/g and CuNi-TiO2was 40.9 m2/g.

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44

Kehrenberg, Corinna y Stefan Schwarz. "fexA, a Novel Staphylococcus lentus Gene Encoding Resistance to Florfenicol and Chloramphenicol". Antimicrobial Agents and Chemotherapy 48, n.º 2 (febrero de 2004): 615–18. http://dx.doi.org/10.1128/aac.48.2.615-618.2004.

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ABSTRACT The Staphylococcus lentus plasmid pSCFS2 carries a novel florfenicol-chloramphenicol resistance gene, designated fexA, encoding a protein of 475 amino acids with 14 transmembrane domains. The FexA protein differs from all previously known proteins involved in the efflux of chloramphenicol and florfenicol. Induction of fexA expression by chloramphenicol and florfenicol occurs via translational attenuation.

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45

Torres, R. M., A. Damineli-Neto y J. A. de Freitas Pacheco. "Infrared spectroscopy of Be stars". Symposium - International Astronomical Union 162 (1994): 412–13. http://dx.doi.org/10.1017/s0074180900215507.

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FeII emission lines are present in a variety of astrophysical objects and, in particular, in Be stars, where in some situations they can also be seen in absorption. Selvelli & Araujo (1984) studied a sample of classical Be stars that have FeII emission lines in the optical region. The analysis of IUE spectra of those stars revealed that, for the majority of the objects, neither absorption nor emission FeII features were present in the UV. The conclusion was that their data could not support excitation of FeII by continuum fluorescence. On the other hand, FeIII of circumstellar origin is often seen in absorption in the UV spectra of Be stars (Snow & Stalio 1987 and references therein). This could be an indication that the optical FeII emission lines are originated from recombination and cascade. However, Selvelli & Araujo (1984) argued that, since the multiplet UV 191 of FeII does not appear in emission, that mechanism is probably not relevant. In the present work we report new spectroscopic observations in the near infrared of a sample of 60 Be stars, including the prominent FeII 999.7 nm emission line. This line is also present in the spectra of superluminous B stars for which mass loss rates have recently been estimated (Lopes, Damineli-Neto & Freitas Pacheco 1992). We derived mass loss rates from the infrared line luminosities, in agreement with those derived by other methods. We also found a new evidence of the Be envelope flattening through the FeII/Paδ line ratio.

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46

Amsler, Maximilian, S. Shahab Naghavi y Chris Wolverton. "Prediction of superconducting iron–bismuth intermetallic compounds at high pressure". Chemical Science 8, n.º 3 (2017): 2226–34. http://dx.doi.org/10.1039/c6sc04683e.

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47

TAKEDA, KAORU, TSUYOSHI YOSHITAKE, YOSHIKI SAKAMOTO, DAISUKE HARA, MASARU ITAKURA, NORIYUKI KUWANO y KUNIHITO NAGAYAMA. "INTERFACIAL STRUCTURE OF Fe3Si/FeSi2 LAYERED FILMS DEPOSITED ON Si(111) AT ELEVATED SUBSTRATE-TEMPERATURES". International Journal of Modern Physics B 23, n.º 17 (10 de julio de 2009): 3543–49. http://dx.doi.org/10.1142/s0217979209062943.

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Influence of substrate-temperature on the interfacial structure of Fe 3 Si / FeSi 2 layered films deposited on a Si (111) substrate were studied. Fe 3 Si / FeSi 2 films with sharp interfaces were grown at room substrate-temperature. At a substrate-temperature of 300 °C, interfaces between the Fe 3 Si and FeSi 2 layers were obviously unsharpened, while the crystallinity of Fe 3 Si was enhanced. The compositional periodic structure was barely unsharpened and it was nearly the same as that of the films deposited at room substrate-temperature. Epitaxial growth of Fe 3 Si layers across FeSi 2 layers was carried out. This substrate-temperature is the upper limit at which the heterostructure formation takes place. At 400 °C, ε- FeSi was formed due to activated interdiffusion, and the structure of Fe 3 Si changed partially from B2-type to DO3-type.

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48

Wright, Gillian S., James R. Graham y Andrew J. Longmore. "Infrared Spectroscopy and Mapping of IC443". International Astronomical Union Colloquium 101 (1988): 395–98. http://dx.doi.org/10.1017/s0252921100102726.

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AbstractWe present infrared (IR) spectroscopy and imaging of the supernova remnant IC443. [FeII] 1.644µm, Brackett γ and H2 1-0 S(l) were detected. The most striking feature of the spectra is the high [FeII] 1.644µm/Brackett γ ratio, which is typically ~30. We argue that this ratio is due to shock excitation. Two 5’×3’ maps of the remnant in the 1.644µm [FeII] line are used to study the line excitation. The IR [FeII] line is a sensitive probe for regions of shocked gas which is especially useful where the extinction is high, or the shocks are too slow to excite optical lines.

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49

HEITLER, W. J. y P. BRÄUNIG. "The Role of Fast Extensor Motor Activity in the Locust Kick Reconsidered". Journal of Experimental Biology 136, n.º 1 (1 de mayo de 1988): 289–309. http://dx.doi.org/10.1242/jeb.136.1.289.

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To whom reprint requests should be addressed. Fast extensor tibiae (FETi) activity has been implicated as a crucial element underlying the locust kick motor programme with regard to four circuits, (i) A positive feedback reflex from extensor tibiae (ETi) muscle tension helps maintain FETi spiking during co-contraction, (ii) A central connection from FETi to flexor tibiae (FITi) motor neurones helps initiate FITi spiking at the start of cocontraction, (iii) Reflex feedback from ETi tension to FITi motor neurones helps maintain the latter spiking during co-contraction after the central connection has decremented, (iv) A proprioceptive gate controlled by ETi tension ensures that FITi trigger activity does not occur until sufficient ETi tension has developed to allow an effective kick. The hypotheses concerning these circuits have been tested in two ways. First, FETi was phasically inhibited for varying periods during co-contraction, abolishingits spikes and hence its central output, and reducing ETi tension. Second, the nerve containing the FETi axon was cut in the femur, thus partially denervating the ETi muscle, and reducing its tension without directly affecting FETi activity. In both cases, kicks were analysed to see whether the motor programme changed in accordance with the circuit model. The overall conclusion is that the model isnot correct, since considerable experimentally induced changes in FETi activity and ETi tension had no obvious effects on the motor programme. The circuits may play a supplementary role in generating the programme, but they are not crucial to it.

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50

Li, Ming, Yufei Hu y Gongke Li. "A study on the cataluminescence of propylene oxide on FeNi layered double hydroxides/graphene oxide". New Journal of Chemistry 45, n.º 26 (2021): 11823–30. http://dx.doi.org/10.1039/d1nj01411k.

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