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Littérature scientifique sur le sujet « High iron content »

Auteur : Grafiati

Publié le 20 décembre 2023

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Articles de revues sur le sujet "High iron content"

GOTO, Fumiyuki, et Toshihiro YOSHIHARA. « Molecular breeding of high iron content crops ». Plant Biotechnology 17, Supplement (2000) : 2. http://dx.doi.org/10.5511/plantbiotechnology.17.supplement_2.

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Khorunzha, T., V. Pasichnyi, A. Marynin, R. Svyatnenko et O. Moroz. « Pasteurized sausages with high heme iron content ». Scientific Messenger of LNU of Veterinary Medicine and Biotechnologies 21, n^o 91 (23 avril 2019) : 43–47. http://dx.doi.org/10.32718/nvlvet-f9108.

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Current issue of today is the process of increasing the range of sausages and extending their storage time, especially for a boiled group of sausages. Therefore, the subject of research is pasteurized sausage, with an increased content of heme iron. The aim of the work was to create a complete product with high organoleptic characteristics, balanced according to biological and nutritional value and to select optimal thermal regimes to increase the shelf life of the product and to preserve the nutritional properties of the product, since cooked sausages have a limited shelf life, and due to properly selected heat regimes, we reach our goals. The receipts of sausages, based on meat of chicken-broiler using dry milk serum, collagen-containing preparation Scan-Pro, based on skin of pigs and micronized food cellulose with a definite level of hydration, a fat-based emulsion on the basis of chicken skins and a collagen-containing preparation Scan Pro and food blood. To increase the content of heme iron towards boiled sausages, food blood of pigs was added, in addition to increasing the nutritional and biological value of blood has a colorforming effect, with its introduction in an optimal amount, to achieve a characteristic color of sausage products. Sauce with the use of jelly-forming thickeners based on food hydrocolloids was added as a sauce. The value of the buffer capacity of the jelly after pasteurization was investigated. The basis for the production of pasteurized sausages was the technology of boiled sausages followed by heat treatment by pasteurization in order to provide an extended shelf life. Sausages were pasteurized at different temperature regimes. To determine the biological value of developed sausages, it was used the application program BIO1.bas. The chemical composition of sausages was modeled based on their functional and technological parameters. Physico-chemical, microbiological, organoleptic research of the product was carried out. The amino acid composition of the product was simulated, which allowed to mention upon the biological and nutritional value of the studied formulations.

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Li, Guo Ping, Li Bo Guo, Li Hui Sun, Feng Hua Luo, Jiao Du et Zeng Lin Liu. « Analysis of the Influence Factors on High Compressibility Water Atomized Iron Powder ». Materials Science Forum 859 (mai 2016) : 118–24. http://dx.doi.org/10.4028/www.scientific.net/msf.859.118.

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In this paper, the influence factors on high compressibility water atomized iron powder LAP100.29 were studied such as the processing parameters, the proportion of coarse particles, powder oxygen content and impurity. The results showed that, by increasing the purity of molten steel and improving atomization temperature, the iron content of water atomized iron powder particles reached more than 99.67 %, the oxygen content was less than 0.08 %, acid insoluble was less than 0.08 %, green density reached 7.21~7.22 g/cm3. The contents of +80 and -80～+100 mesh powder were 1.6 % and 7.5 %, respectively. The compressibility could be improved by the increase of the coarse particles and the reduction of the fine particles (for example, lowering the content of -325 mesh particles). Generally speaking, the compressibility of the water atomized iron powder can be improved fundamentally by reducing oxygen content, impurity content and the reasonable distribution of particle size.

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MURATA, Kazuhisa, Hirobumi USHIJIMA et Kunio UCHIDA. « Simple Preparation of Carbon-coated Iron Particles Having High Iron Content. » Journal of The Japan Petroleum Institute 41, n^o 2 (1998) : 168–72. http://dx.doi.org/10.1627/jpi1958.41.168.

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Loginova, Irina V., et Aleksei V. Kyrchikov. « Complete Processing of the High-Iron Content Red Mud ». Materials Science Forum 946 (février 2019) : 569–74. http://dx.doi.org/10.4028/www.scientific.net/msf.946.569.

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When bauxites from the Middle Timan and Severouralsk deposits are processed into alumina by the low-temperature sintered process the high-iron content red mud can be obtained. The red mud contain up to 58 % of iron and are a potential raw material for ferrous metallurgy. Rare earth elements (REEs) such as Sc, Y and La are converted from bauxites to red mud in the form of hydroxides during processing and are easily leached by weak acid solutions. In this work, the red mud is treated with a solution of sulfuric acid (pH = 2.5–5), the REEs pass into solution, and then the solution is neutralized to obtain a precipitate, i.e. a concentrate of rare elements. The recovery of REEs is about 75–90 % (Sc, Y, La). The high-iron content red mud is converted to the naturally-doped cast iron and titanium slag (up to 50 wt.% TiO2). As a result of processing bauxite, alumina (Al2O3), the naturally-doped cast iron, concentrate of REEs (Sc, Y, La, etc.) and titanium slag (TiO2) are obtained. The flowsheet of the proposed complete processing of the high-iron content red mud is given.

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Florea, C., C. Bejinariu, I. Carcea, N. Cimpoesu, D. L. Chicet et C. Savin. « Obtaining of High Cr Content Cast Iron Materials ». IOP Conference Series : Materials Science and Engineering 209 (juin 2017) : 012046. http://dx.doi.org/10.1088/1757-899x/209/1/012046.

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Mastral, A. M., C. Mayoral, M. T. Izquierdo et C. Pardos. « Iron catalyzed hydrogenation of high sulphur content coals ». Fuel Processing Technology 36, n^o 1-3 (décembre 1993) : 177–84. http://dx.doi.org/10.1016/0378-3820(93)90025-y.

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Darvishi, Alireza, Ali Maleki, Mehdi Mazar Atabaki et Mohammad Zargami. « The mutual effect of iron and manganese on microstructure and mechanical properties of aluminium –silicon alloy ». Metalurgija-Journal of Metallurgy 16, n^o 1 (31 mars 2010) : 11–24. http://dx.doi.org/10.30544/383.

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The effect of iron and manganese concentration on the morphology of complex intermetallics and their influence on the mechanical properties and microstructure has been studied in an Al-16.67 wt. % Si alloy with three content of iron (0.4, 1.2, 1.8 wt.%), and two different content of manganese, i.e. 0.6 and 0.9 wt.%. The intermetallic compounds are formed at high iron contents or at high concentrations of manganese with low iron. The microstructural investigation by Clemex software showed that the biggest intermetallic size reached the surface area of 12750 μm2, when the amount of iron was increased from 1.2% to 1.8% wt.%. It was also showed that the volume fraction of intermetallic compounds increases as the iron and manganese content increases. Formation of complex intermetallic phases with iron adversely affects tensile strength decreasing from 229MPa with 0.4 wt.% of iron to 187MPa when iron content was increased to 1.8 wt.%.

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GOTO, F., et T. YOSHIHARA. « Improvement of Micronutrient Contents by Genetic Engineering. Development of High Iron Content Crops. » Plant Biotechnology 18, n^o 1 (2001) : 7–15. http://dx.doi.org/10.5511/plantbiotechnology.18.7.

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Pereira, Gustavo Eduardo, Letícia Sequinatto, Jaime Antonio de Almeida, Alexandre Ten Caten et Josie Moraes Mota. « VIS-NIR spectral reflectance for discretization of soils with high sand content ». Semina : Ciências Agrárias 40, n^o 1 (15 février 2019) : 99. http://dx.doi.org/10.5433/1679-0359.2019v40n1p99.

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The aim of this study is to evaluate the spatial distribution and relationships between the physicochemical attributes and radiometry of soils with high sand contents. One hundred surface horizon samples were collected for physicochemical and spectral analyses of the soil. The samples were selected spatially by the conditioned Latin hypercube method. The physicochemical analyses consisted of granulometry, organic carbon content, and iron oxides content, extracted using sodium dithionite-citrate-bicarbonate (DCB). The spectral response of the soils was analyzed in the 400 to 1000 nm range. The spectral curves were obtained from the samples of the surface horizons, which were categorized according to the attribute in question. The relationship between the soil physicochemical attributes and soil radiometry was evaluated through a Pearson's correlation. There was a tendency for the organic carbon content to decrease with an increase in soil depth, associated with the presence of soils with higher sand contents. For soils with iron contents lower than 80 g kg-1, there was an increase in the reflectance along the spectrum, whereas for soils with contents between 80 and 160 g kg-1, the reflectance decreased after 600 nm, with greater variation along the spectrum for soils with iron contents higher than 120 g kg-1. The diffuse reflectance spectroscopy could potentially allow for granulometric distinction between the soils evaluated.

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Thèses sur le sujet "High iron content"

Ram, Gokul, et Vishnu Harikrishnan. « INFLUENCE OF CARBON CONTENT AND COOLING CONDITIONS ON THE THERMAL CONDUCTIVITY AND TENSILE STRENGTH OF HIGH SILICON LAMELLAR GRAPHITE IRON ». Thesis, Tekniska Högskolan, JTH, Material och tillverkning, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-51152.

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Much study has been carried out to determine the properties of Lamellar Graphite Iron (LGI) or grey iron and their relations to factors such as the cooling rate, the dendrite morphology, the pouring temperature, and so on. However, there hasn’t been much comprehensive study on the properties of LGI outside the generally used and accepted composition, with 1 to 3% Silicon. The scope of this study is to measure and evaluate the thermal conductivity and tensile strength of LGI, for a higher concentration of Si and different carbon contents. The concentration of Si aimed for was 4% but the concentration obtained after spectroscopy was between 4.1% to 4.15%. There are two hypereutectic, one near-eutectic and three hypoeutectic samples considered and these six chemical compositions were cast under different cooling conditions . The cooling time has been varied by providing different molds of 30mm, 55mm, and 80mm diameter cylinders respectively, for all the six sample compositions. The microstructure analysis carried out studies the segregation of Si, the graphite morphology, primary austenite morphology. These factors are then compared to the thermal and tensile behavior measured in this study. It can be observed that the thermal conductivity studied in the present work has a direct correlation for a higher Si content and tends to be greater than the thermal conductivity values observed from other studies with lower content Of Si. However, the conductivity shows an inverse relation with the cooling rate and is maximum for the samples with the lowest cooling rate. The tensile strength, on the other hand, seems to have a lower value than that observed in previous studies for LGI with 1 to 3% Si, but shows a direct correlation with the cooling rate. The mean area fraction of dendrites obtained and the mean interdendritic hydraulic diameter is also measured and their influence on the properties are also studied. The addition of more Si has greatly favored the thermal behavior positively but has also reduced the tensile strength.

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FALERO, EDELINK EFRAIN TINOCO. « DEVELOPMENT OF A TECHNIQUE TO PERMIT THE USE OF IRON ORES BEARING HIGH PHOSPHOR CONTENT AIMING AT COMPETITIVENESS FOR THE DIRECT REDUCTION MARKET ». PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2011. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=19251@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE SUPORTE À PÓS-GRADUAÇÃO DE INSTS. DE ENSINO
As pelotas de minério de ferro têm suas propriedades fortemente dependentes da natureza das fases escorificadas que se formam durante o processo de queima. Neste trabalho são apresentados os resultados de uma das pesquisas que compõem o projeto cooperativo entre a Samarco e o Grupo de Siderurgia do DEMa / PUC-Rio, envolvendo a possibilidade de utilização de minérios de ferro portadores de fósforo (pellet feed), na produção de pelotas para redução direta. Com este objetivo foram geradas amostras de escórias sintéticas de mesma composição que as das pelotas RD comerciais, as quais foram submetidas a condições experimentais análogas as do processo industrial. Inicialmente a ciclos térmicos em forno tipo pot-grate e, posteriormente, em escala laboratorial, usando forno de mufla, seguido de etapas de resfriamento em velocidades distintas. Foi possível então constatar que velocidades mais altas de resfriamento, aplicadas na etapa final dos ciclos térmicos, produziam escórias sintéticas sensivelmente amorfas, o que levou a conclusão que as fases escorificadas das pelotas RD também se apresentariam como estruturas não cristalinas. Finalmente, por meio de teste especificamente desenvolvido para a análise seletiva de fósforo em fases oxídicas, conseguiu-se obter uma maior eficiencia na mensuração deste elemento quando dissolvido em escórias amorfas, o que viabilizou a medida das quantidades de fósforo que efetivamente migraram para as mesmas, quando se submetiam as amostras de pellet feed a diferentes temperaturas, variados tempos de residencia e distintas basicidades. Por fim, foi possivel concluir ser o incremento de basicidade do pellet feed um fator de significativa melhoria para o transporte e a dissolução do fósforo pelas escórias, em particular quando submetidos a temperaturas superiores a 900 graus Celsius.
Iron ore pellets have their properties strongly dependent on the nature of the phases present in the slags formed during pelletization. In this work are presented the first results of a research program involving the utilization of phosphorous bearing iron ores in the production of DR pellets (Direct Reduction pellets). Aiming at this, synthetic slags, produced with same composition of the gangue of a commercial DR pellet, were submitted to operational conditions similar to those of the industrial pelletizing process, but performed in a pot-grate reactor and in a laboratory furnace. The obtained slags samples were cooled at different rates, permitting to observe that at high cooling rates the slags obtained were amorphous, suggesting the occurrence of a similar amorphous structure for the slags present in the DR pellets. Finally, tests developed for a selective analysis of phosphorous in oxide phases, showed better efficiency when applied to amorphous slags than in crystalline ones. Further, the behavior of the phosphor dissolution in the obtained slags during the heating of pellet feed samples was evaluated. In this phase different temperatures, resident times and basicities were tested using a laboratory furnace. The results indicated improvements in the phosphor dissolution with the basicity increase when temperatures above 900 Celsius degrees were applied.

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Rauch, Jeanne-Marie. « Comportement électrochimique d'électrolytes Zinc Fer à haute teneur en Fer, germination et effet des courants pulsés ». Electronic Thesis or Diss., Bourgogne Franche-Comté, 2022. http://www.theses.fr/2022UBFCD031.

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La mise au point de revêtements anticorrosion présente à la fois un enjeu économique et un défi environnemental. En effet de nombreuses contraintes sont apparues dans le domaine des traitements de surface au cours des dernières décennies, du fait de la mise en application de restrictions sur l'utilisation de certains produits. Ainsi, la directive européenne RoHS (Restriction of the use of certain Hazardous Substances) limite l'utilisation de substances dangereuses au niveau des équipements électrique et électroniques. La règlementation REACH quant à elle, évalue les substances avant de les autoriser dans le cadre d'une politique visant à améliorer la santé humaine. Cela passe par le contrôle des applications des sels métalliques tels que le sulfate de nickel ; utilisé dans les revêtements de zinc-nickel. Pour pallier ces contraintes, de nouvelles pistes ont déjà été explorées à l'occasion du projet IZAC : Inovative Zinc Al loy Coating. Ce projet, un consortium entre le laboratoire UTINAM et des partenaires industriels, a contribué à l'élaboration d'une couche sacrificielle ZnFe à haute teneur en Fer objet d'un brevet international. Le présent travail fait partie du projet ATLAS, piloté par L'IRT M2P en regroupant trois universités, françaises et belges avec un consortium de 22 partenaires industriels. La contribution académique de la thèse faite dans UTINAM est la compréhension du comportement électrochimique des électrolytes en discriminant l'influence de chacun des constituants, distinguant les fonctions (complexants, additifs de chimisorption, sels supports) des interactions (complexation et précipitation). Le comportement dynamique des systèmes sera également observé par l'étude des transitoires lors de la modulation de la polarisation de l'onde de courant. Il s'agira de chercher les séquences les plus efficaces vis-à-vis de l'électrodéposition et de la teneur en éléments d'alliage, en pulse simp les et inverses. Une attention particulière sera donnée aux phénomènes microscopiques, et en particulier aux premiers instants des dépôts car l'étape de germination est répétée à chaque pulse de courant, grâce à des chronoampérométries à grande vitesse d'acquisition. Une modélisation du comportement de la couche limite sera recherchée sur la base des équations de diffusion avec le solveur COMSOL. Dans un second volet de la thèse, on s'intéressera aux propriétés physico-chimiques et fonctionnelles des revêtements obtenus pour les différentes conditions. En particulier, les effets des courants pulsés sur la composition des dépôts, la distribution des éléments d'alliage et la répartition des épaisseurs seront quantifiés. La modélisation sera un outil important utilisé en parallèle des courants pulsés afin de réussir à obtenir une meilleure répartition des lignes de courants sur des géométries simples et complexes. L'objectif est d'agir sur la bonne répartition des dépôts, sur la surf ace des pièces plane, mais aussi des accidents (rainures, trous, trous borgnes, coudes...) grâce à une meilleure compréhension du fonctionnement de l'électrolyte et des effets des courants pulsés. Les dépôts réalisés avec les meilleurs paramètres de séquences de pulses (Ja, Jc, Ta, Tc…) seront ensuite caractérisés, notamment par microscopie à balayage (MEB) ou par diffraction des rayons X (DRX), ainsi que par des caractérisations fonctionnelles par des tests internes au laboratoire, mais aussi chez les partenaires industriels du projet. En vue du passage à des volumes de travail plus important à l'IRTM2P, une étude des paramètres à prendre en compte sera réalisée en unité pilote à l'Institut UTINAM
The development of new corrosion resistant plating has become a challenge in both environmental and economic terms. Indeed, numerous constraints have aroused in surface treatments domain in recent decades, most of them due to the restriction on the use of certain products. As for example, RoHS Directive (Restriction of the Use of Certain Hazardous Substances) limits the use of dangerous substances in electrical and electronic equipment. In the same manner, REACH European regulations realized the substances inventory before their authorization, for the improvement of environmental conditions and human health. This include the control of metal salts as for example nickel sulphates, used in several applications such as zinc-nickel coatings. To overcome these constraints, new solutions have already been explored during the IZAC project: Innovative Zinc Alloys Coating. This project, a consortium between the UTINAM laboratory an d industrial partners, has contributed to the development of a ZnFe sacrificial layer with high iron content, subject to an international patent. The present work is part of the ATLAS project, led by the IRT M2P, which gather together three French and Belgian Universities associated to a consortium of 22 industrials partners. The academic contribution of the present thesis made in the UTINAM institute is the understanding of the electrochemical behavior of the electrolyte by discriminating the influence of every constituents. The different functions (complexing agents, chemisorption additives, supports salts…) will be insulated from the interactions (complexation and precipitation). The dynamic behavior of the systems will also be observed by the study of the transients during the modulation of the polarized current wave. The final goal will end up with the most effective sequences regarding the electrodeposition ability and the content of alloys elements, with simple and inverse pu lses. Special attention will be paid to microscopic phenomena and to the first moments of the plating, since the germination step is repeated for each current pulse, by high speed chronoamperometry. A modeling of the behavior of the boundary layer will be proposed by using the diffusion equation with COMSOL solver. In a second part of the thesis, physicochemical and functional properties of the plating obtained for different conditions will be investigated. For this purpose, effects of pulsed currents on the coatings composition, alloying elements distribution and thickness distribution will be quantified. Modelling will be used together with pulsed currents to obtain a better repartition of current lines on simple and complexes geometries. The objective is to act for an optimum repartition of the coatings on the surfaces of flat parts, but also on accidents (grooves, holes, blind holes, elbows…) thanks to a better understanding of the interactions between the electrolyte and the p ulsed currents. The coatings elaborate with the best pulse sequence parameters (Ja, Jc, Ta, Tc…) will be characterized by several techniques among with scanning microscopy (SEM) or X-ray diffraction (XRD) as well as for their functional behavior, by internal laboratory tests and with industrial partners means. Finally, to apprehend the scale-up to greater volumes at IRTM2P, a study of the parameters in a pilot unit at the UTINAM Institute will be undertaken

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Webber, J. Beau W., Philip Bland, John H. Strange, Ross Anderson et Bahman Tohidi. « Why you can’t use water to make cryoporometric measurements of the pore size distributions in meteorites – or in high iron content clays, rocks or concrete ». Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-191847.

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Many porous materials have high susceptibility magnetic gradients in the pores, due to the presence of iron or other magnetic materials. Thus if probe liquids are placed in the pores they exhibit fast decaying signals with a short T2*. Usually the actual T2 of the liquids is also reduced, due the presence of paramagnetic ions in the pore walls. The usual solution in NMR is to measure an echo (or echo train) at short times. However, recent work [J. Phys.: Condens. Matter 19, 415117, 2007.] has shown that water/ice systems near a pore wall form rotator phase plastic ice, with T2 relaxation times in the region of 100 to 200 ms. Thus if a NMR cryoporometric measurement is attempted with a measurement time significantly less than 1 or 2 milli-seconds, the result is to make a measurement based on the phase properties of the brittle to plastic ice phase transition, not that of the brittle ice to water phase transition. This gives rise to artefacts of small pore sizes that may not actually be present. This work successfully uses a-polar liquids instead.

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Webber, J. Beau W., Philip Bland, John H. Strange, Ross Anderson et Bahman Tohidi. « Why you can’t use water to make cryoporometric measurements of the pore size distributions in meteorites – or in high iron content clays, rocks or concrete ». Diffusion fundamentals 10 (2009) 3, S. 1-3, 2009. https://ul.qucosa.de/id/qucosa%3A14092.

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Finer, Julia E. « Evaluation of the Effect of Dioxygen, Industrial Heterogeneous Palladium Catalyst, pH and Iron Content on the Generation of 3 High-Value Aldehydes from Corn Stover Lignin ». University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1397234827.

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Miozzi, Ferrini Francesca. « Experimental study of the Fe-Si-C system and application to carbon rich exoplanet ». Electronic Thesis or Diss., Sorbonne université, 2019. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2019SORUS241.pdf.

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Plus de 4000 exoplanètes ont été découvertes, orbitant autour d’étoiles ayant différentes compositions. Ces exoplanètes sont détectées et étudiées par observations indirectes qui, dans de nombreux cas, donnent accès aux propriétés principales des planètes: leurs masses et leurs rayons. Ces paramètres peuvent être calculés à partir d’un modèle et comparés à ceux observés. Toutefois, cela est plus difficile pour des planètes qui orbitent autour d’étoiles ayant une composition chimique différente du Soleil, par exemple enrichie en carbone, car les propriétés physiques des carbures (i.e. carbures de silicium ou de fer) sont inconnues. Dans cette étude les systèmes Si-C et Fe-Si-C ont été étudiés entre 20 et 200 GPa et 300-3000 K, en utilisant la diffraction de rayons x et l’analyse chimique des échantillons récupérés pour déterminer les propriétés physiques dans des conditions extrêmes. Dans le système Si-C les équations d’états et les modèles thermiques pour les deux phases de basse et haute pression ont été déterminés. Les résultats ont ensuite été utilisé pour calculer la relation masse-rayon de planètes synthétiques ayant un noyau de fer et un manteau de SiC. Concernant le système Fe-Si-C le diagramme de phase ternaire a été reconstruit. En faisant l’hypothèse d’une composition Fe-Si-C pour un noyau planétaire, quatre différentes séquences de cristallisation ont été démontrées, déterminant des comportements dynamiques très diffèrent. En conclusion la relation masse-rayon n’est pas suffisante pour déterminer la composition et la structure interne des exoplanètes observées mais des données relatives à la chimie du système planétaire sont requises
More than 4000 exoplanets have been discovered, orbiting around stars with a wide variety of composition. Such planets are detected and studied through indirect methods that in many cases give access to the main properties of the planets: mass and radius. The same parameters can be calculated from a chosen model and compared to the observed ones. However it is difficult for planets orbiting around stars with compositions very different from our Sun, for example carbon enriched, as the physical properties carbides (i.e. silicon carbides and iron carbides) at extreme pressure are unknown. In this work the Si-C and Fe-Si-C systems were studied in the range between 20 and 200 GPa and 300-3000 K employing X-ray diffraction and chemical analyses on the recovered samples were used to determine the physical properties at extreme conditions. In the Si-C system the equations of state and thermal model for both the low pressure and high pressure phases were determined. The results were then used to model a mass radius plot for different archetypal planets with a Fe core and SiC mantle. Regarding the Fe-Si-C system a ternary phase diagram was reconstructed up to 200 GPa and 3000 K. Assuming Fe-Si-C as main component of planetary cores, four different crystallization paths are individuated, giving rise to way different dynamical behaviour. We conclude that using only mass radius relations is not sufficient to determine the interior composition and structure of an observed exoplanet and further data relative to the chemistry are needed, for example the composition of the host star

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Yamaguchi, Ken. « Contents of Endometriotic Cysts, Especially the High Concentration of Free Iron, Are a Possible Cause of, Carcinogenesis in the Cysts through the Iron-Induced Persistent Oxidative Stress ». Kyoto University, 2009. http://hdl.handle.net/2433/124264.

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Chen, Cheng-Kang, et 陳正剛. « High Strength High Ductility Die Casting Al Alloy with Low Iron Content ». Thesis, 2015. http://ndltd.ncl.edu.tw/handle/58121244653596728973.

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碩士
大同大學
材料工程學系(所)
103
An investigation on the development of high strength high ductility die casting Al alloys with low-none iron content, based on a ADC3 Al alloy (Al-9.5Si-0.8Fe-0.4Mg), was carried out in this study. The first part of this study was to examine the microstructures and the mechanical properties of a series of ADC3-base alloys with different iron content and modified alloy compositions. The second part of this study utilized a T5 and a spheroidization heat treatments to further improve the mechanical properties of the modified ADC3-base alloys. The results show that, when iron content in gravity cast ADC3-base alloys was reduced from 0.8% to 0.4%, the amount of plate-like iron-rich compound with sharp edges was found decreased significantly. As such, the ductility of the low-iron ADC3-base alloys increase accordingly. Among the low-iron ADC3-base alloys studied the ADC3S2 alloy containing Cr and Zr (Al-9.5Si-0.4Fe-0.4Mg-0.3Cr-0.3Zr-0.02Sr) exhibited the best combination of high mechanical strength and high ductility. While in the iron-free ADC3-base alloys studied the non- heat–treatable ADC3S7 alloy (Al-9.5Si-0Fe-0Mg-0.6Mn-0.3Cr-0.3Zr- 0.02Sr) exhibited the best combination of high mechanical strength and high ductility. In comparisons of mechanical properties in the as-cast condition of die casting ADC3 (0.8 Fe), ADC3S2 (0.4 Fe) and ADC3S7 (Fe-free) alloys, the mechanical properties of low-iron ADC3S2 and iron-free ADC3S7 Al alloys are very similar and better than that of ADC3 (0.8 Fe). The YS, UTS and ductility values of as-cast ADC3S2 and ADC3S7 alloys are in the range of 190~192 MPa, 296~298 MPa and 8.1~8.2%, respectively. When subjected to a T5 treatment at 175oC for 8 h, the die cast ADC3S2 exhibited far better mechanical properties than the other two alloys, with YS, UTS and ductility of 260 MPa, 339 MPa and 7.8%, respectively. However, when subjected to the spheroidization treatment at 350oC for 0.5 h, the mechanical properties of three die cast alloys are very alike. The YS, UTS and ductility values in the die casting ADC3 (0.8 Fe), ADC3S2 (0.4 Fe) and ADC3S7 (Fe-free) alloys are in the range of 146~158 MPa, 224~245 MPa and 12.3%~15.0%, respectively.

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Swain, Biswajit Kumar. « Plasma Smelting of Iron Ore Fines Having High Silica Content ». Thesis, 2016. http://ethesis.nitrkl.ac.in/8264/1/2016_MT_214MM2452_Plasma.pdf.

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A lot of ore fines are collected at iron ore mines. Till date no measure move is being made for usage of fines for extraction of metallic iron. Generally metallic iron is produced through BFO and DRI processes where particle/ore size and reductant is the most important factor considered for BF charge. The present piece of research work is aimed at use of iron ore fines for production of metallic iron. So there is a process adopted for increasing recovery called agglomeration, which includes pellets and sinter. A newly emerging technology i.e. plasma smelting process is adopted for reduction of iron ore fines. In this project Pellets of iron ore fines (60 % Fe), 8.4% carbon, 0.3%catalyst (containing Al 33%, Ca 20%, Si 5%, Mg 42%) was sintered at 1260 degree centigrade. It is charged to a 35 KW dc arc plasma furnace and smelted for different time lengths i.e. 7, 9 and 13min using argon and nitrogen, as plasma forming gas. The amount of recovery for all samples is measured. Maximum of 93.6 % recovery is achieved. It is observed that use of nitrogen as plasma forming gas increases the rate of recovery than that of argon plasma, due to high energy flux of nitrogen gas which increases the enthalpy due to its diatomicity. The X-ray diffraction analysis shows the presence of ferrite, iron carbide and ferrosilicon nitride phases in the smelted product. Variation of microstructure is observed with the samples. The hardness measurement of different phases on the sample ensured the presence of ferrite, iron carbide and ferrosilicon phases depending on smelting condition

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Livres sur le sujet "High iron content"

Puntis, John. Formula and complementary feeding. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198759928.003.0005.

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Some mothers are unable, or choose not, to breastfeed; bottle-feeding carries certain risks that can be minimized by following simple rules. Formula must satisfy all the nutritional needs of an infant and recommendations for the composition of infant formula have been adopted in the Codex Alimentarius. The two main types of formula differ in protein composition (whey or casein predominant). Follow-on formula are designed for infants from 6–12 months of age. Soy protein is an alternative to cow milk protein, but because of its high phytoestrogen content, should not be used before 6 months. Unmodified cow’s milk as the main drink before 12 months of age is associated with iron deficiency. ‘Complementary feeding’ embraces all solid and liquid feeds other than breast milk and infant formula. There is considerable international variation in practice with regard to introduction of complementary feeds, but in general this should not be before 17 weeks, and not after 26 weeks.

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Gustafsson, Tommy, et Pietari Kääpä, dir. Nordic Genre Film. Edinburgh University Press, 2015. http://dx.doi.org/10.3366/edinburgh/9780748693184.001.0001.

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Nordic Genre Film offers a transnational approach to studying contemporary genre production in Nordic cinema. It discusses a range of internationally renowned examples, from Nordic noir such as the television show The Bridge and films like Insomnia (1997) to high concept ‘video generation’ productions such as Iron Sky (2012). Yet, genre, at least in this context, indicates both a complex strategy for domestic and international competition as well as an analytical means to identify the Nordic film cultures’ relationships to international trends. Conceptualizing Nordic genre film as an industrial and cultural phenomenon, other contributions focus on road movies, the horror film, autobiographical films, the quirky comedy, musicals, historical epics and pornography. These are contextualized by discussion of their place in their respective national film and media histories as well as their influence on other Nordic countries and beyond. By highlighting similarities and differences between the countries, as well as the often diverse production modes of each country, as well as the connections that have historically existed, the book works at the intersections of film and cultural studies and combines industrial perspectives and in depth discussion of specific films, while also offering historical perspectives on each genre as it comes to production, distribution and reception of popular contemporary genre film.

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Hunter, Shireen T. Iran’s Foreign Policy in the Post-Soviet Era. ABC-CLIO, LLC, 2010. http://dx.doi.org/10.5040/9798400672514.

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A comprehensive exploration of postrevolution Iranian foreign policy analyzes the country's relations with key nations and regions and the impact of both Iran's domestic situation and the developing global system. Iran's Foreign Policy in the Post-Soviet Era: Resisting the New International Order provides the first truly comprehensive, in-depth survey of Iranian foreign policy, issue by issue and country by country, since the Islamic Revolution. To help readers understand both the what and the why of Iran's role in the world and formulate useful responses to that role, the author provides a detailed analysis of Iranian foreign policy in all its dimensions. The first part of the book places Iranian actions, particularly its relations with the United States and other key players, within the context of the emerging international system, while also showing how domestic developments impact foreign policy. The second part surveys Iranian relations with specific actors, notably the United States and Russia, and with key regions, including Europe, Central Asia, the Arab world, Latin America, and Africa. Providing an antidote to existing preconceptions, this incisive analysis lays an analytically sound basis for shaping policies toward Iran—policies with potentially high payoff in terms of regional security and stability.

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Honeyman, Susan. Perils of Protection. University Press of Mississippi, 2019. http://dx.doi.org/10.14325/mississippi/9781496819895.001.0001.

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When we generalize about children, we are often also implicitly generalizing about their care, from within a "middle-class" view of "nuclear" family. These as sumptions rely on anorm that few of us actually fit. Yet it is very difficult to talk about children from completely outside of such an assumed model of support in the private or "islanded" sphere. In contrast, children in literature are just as often disconnected from family in order to have greater adventures in more public spaces. They must leave the confines of the private family to for gean other sphere in which to grow. But the real experiences of children at tempting public connection or freedom to roam are farmore complicated, ranging from captivity and containment to escape and self-reliance. Utilizing both fictions of child adventure and accounts of experiences by actual children, Honey mandemonstrates that childwelfare depends upon not just protection, but also participation. How can protection, which sounds so comforting, do harm? Perils of Protection will trace how the best of intentions to protect children can none the lesshurt them if leaving them unprepared to acton the irown behalf. Each chapter will center on this perilous pattern in a different context: "women and children first" rescue hierarchies, geographic restriction, abandonment, censorship, and illness. Analysis from adventures real and fictionalized will offer the reader high jinx and heroism at sea, the rush of risk, finding new families, resisting censorship through discovering shared political identity, and breaking the pretences of sentimentality.

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Chapitres de livres sur le sujet "High iron content"

Zhang, Yan, Gele Qing, Yunqing Tian, Zhixing Zhao, Guoyou Liu, Kai Wang, Wenwang Liu et al. « Pelletizing of Iron Ore with High Iron Grade and Low Silicon Content ». Dans The Minerals, Metals & ; Materials Series, 363–72. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92388-4_32.

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Huang, Zhucheng, Bin Chai, Lingyun Yi et Tao Jiang. « Reduction and Separation of High Iron Content Manganese Ore and Its Mechanism ». Dans 4th International Symposium on High-Temperature Metallurgical Processing, 367–75. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118663448.ch45.

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de Oliveira, Caio Cesar Spindola, et Daniel Dayrell Pereira. « Simulation of an Alternative Direct Leaching Process for High Iron Content Zinc Concentrates ». Dans The Minerals, Metals & ; Materials Series, 405–15. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37070-1_35.

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Mao, Xiaoming, Zhixiong You, Yuanbo Zhang, Zhenyu Fan et Tao Jiang. « Effects of Oxygen Content and Roasting Temperature on the Sintering Mineralization Properties of Different Iron Ores ». Dans 4th International Symposium on High-Temperature Metallurgical Processing, 131–38. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118663448.ch17.

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Dong, Y. S., H. Zhang, Y. Hou et J. L. Tian. « Mix design of base course of high ratio content iron tailings sand recycled mixture ». Dans Green and Intelligent Technologies for Sustainable and Smart Asphalt Pavements, 3–6. London : CRC Press, 2021. http://dx.doi.org/10.1201/9781003251125-1.

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Whalen, Scott, Nicole Overman, Brandon Scott Taysom, Md Reza-E-Rabby, Timothy Skszek et Massimo DiCiano. « Shear Assisted Processing and Extrusion of Unhomogenized Aluminum Alloy 6063 Castings with High Iron Content ». Dans The Minerals, Metals & ; Materials Series, 327–32. Cham : Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-22532-1_45.

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Pazouki, M., M. R. Hosseini, M. Ranjbar et F. Ghavipanjeh. « Bioleaching of a High Iron Content Kaolin by Aspergillus niger : The Effects of Organic Acids Biosynthesis ». Dans Advanced Materials Research, 111–14. Stafa : Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-452-9.111.

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Dugic, Izudin. « Effect of Molybdenum Content, Pouring Temperature and Cooling Rate on the Casting Defects of High Chromium White Cast Iron ». Dans TMS 2017 146th Annual Meeting & ; Exhibition Supplemental Proceedings, 475–82. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51493-2_45.

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Parasuraman, Malathy, et Priyantha Weerasinghe. « Application of mutation breeding techniques in the development of green crop varieties in Sri Lanka : the way forward. » Dans Mutation breeding, genetic diversity and crop adaptation to climate change, 76–82. Wallingford : CABI, 2021. http://dx.doi.org/10.1079/9781789249095.0008.

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Abstract The Department of Agriculture (DOA) in Sri Lanka initiated mutation breeding in the 1960s with the introduction of a cobalt-60 source. The first rice mutant variety, MI 273, was released for general cultivation in 1971. M1 273, derived from irradiation of the H-4 variety, was identified as a drought-tolerant variety. An indirect rice mutant variety, developed by crossing the short mutant line BW267-3 with a highly adaptable variety, was released as BW 372 in 2013. It is moderately tolerant to blast, bacterial leaf blight, brown plant hopper, gall midge and iron toxicity, and thus increases productivity to 3-4 t/ha on lands prone to iron toxicity. The most popular groundnut variety cultivated in the country, 'Tissa', is a mutant developed by irradiation with gamma-rays at 200 Gy. It showed attributes of high yield, medium maturity (90-100 days) and high oil content (42%). 'Tissa' presently covers 80% of the groundnut cultivated area in Sri Lanka. A sesame mutant line, derived from the variety MI-3 irradiated at 200 Gy with 60Co gamma-rays, was released as 'Malee' (ANK-S2) in 1993. It is a high-yielding variety (1.1-1.8 t/ha) resistant to Phytophthora blight. A cherry-type mutant tomato variety, developed by irradiation of seeds with gamma-rays (320 Gy), was released as 'Lanka Cherry' in 2010. Improved attributes are pear-shaped fruits and bacterial wilt resistance. Narrow genetic variability in many crops is a constraint to the development of new varieties adapted to the changing climate. Hence, the DOA is emphasizing integration of induced mutagenesis in conventional breeding programmes to develop resistant/tolerant varieties having high yield, quality and health-promoting functional properties in field and horticultural crops. The newly installed gamma irradiation chamber facilitates the creation of genetic variability in food crops, thus paving the way for the development of greener varieties.

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Rapti, Stavroula, Stamatis C. Boyatzis, Shayne Rivers et Anastasia Pournou. « Siderophores and their Applications in Wood, Textile, and Paper Conservation ». Dans Microorganisms in the Deterioration and Preservation of Cultural Heritage, 301–39. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69411-1_14.

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AbstractSince the 1950s, siderophores have been acknowledged as nature’s chelating powerhouse and have been given considerable attention concerning their crucial roles in microorganisms and plants for capturing non-bioavailable iron from aquatic and terrestrial environments, as well as for their applications in agriculture, health, and materials science and environmental research. In recent years, the exceptional affinity and complexing efficacy, as well as the high selectivity of these potent chelators towards iron(III), have led to investigations by researchers aiming at understanding their capacity for removing potentially harmful and aesthetically unacceptable iron stains from organic substrates in cultural heritage objects. In the context of the conservation of cultural heritage objects, potent chelators have been proposed to remove iron from surfaces by transferring it to the more soluble complexed phase. In this review, the origins and the types of bio-environments of siderophores as well as their structure and chemistry are investigated and related to the requirements of conservation. It is evident that, given the enormous potential that these chelators have, the research for their application in cultural heritage is at a preliminary level, and has to date been within the rather narrow context of cellulosic materials such as paper and wood. The results of research conducted to date are presented in this review and questions regarding the optimal use of siderophores as iron-removing agents are posed.

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Actes de conférences sur le sujet "High iron content"

Stepanova, Natalia, Anatoly Bataev et Aleksey Razumakov. « Quenching of cast iron with a high copper content ». Dans ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4932912.

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Chen, W., J. Ma, X. Huang et Y. Fang. « Behavior of iron loss under non-sinusoidal excitation with high harmonic content ». Dans 2015 IEEE International Magnetics Conference (INTERMAG). IEEE, 2015. http://dx.doi.org/10.1109/intmag.2015.7157487.

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Korb, G., M. Rühle et H. P. Martinz. « New Iron-Based ODS-Superalloys for High Demanding Applications ». Dans ASME 1991 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/91-gt-405.

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Some shortcomings of the commercial alloy MA 956 like insufficient hot gas corrosion resistance at extremely high temperatures or porous welding seams as a result of residual inert gas content, have been overcome by slightly changing the chemical composition, and a generally improved process technology. The mainly developed “work horse”-alloy PM 2000 - exhibits additionally significantly better stress-rupture properties at high temperatures. Workability even down to small dimensions is good, when an especially adapted processing route is applied. In this paper data of tensile strength and stress rupture properties are given for elevated temperatures. Hot gas corrosion behaviour is demonstrated for isothermally and cyclicly treated materials, including thermal shock tests. Some results of a burner rig test are presented additionally. Resistance against different molten slags, salts and glasses has been investigated and is discussed.

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Singh, A., F. Al-Raqom, J. Klausner et J. Petrasch. « Hydrogen Production via the Iron/Iron Oxide Looping Cycle ». Dans ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54499.

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The iron/iron-oxide looping cycle has the potential to produce high purity hydrogen from coal or natural gas without the need for gas phase separation: Hydrogen is produced from steam oxidation of iron or Wustite yielding primarily Magnetite; Magnetite is then reduced back to iron/Wustite using syngas (CO+H2). A system model has been developed to identify favorable operation conditions and process configurations. Process configurations for three distinct temperature ranges, (i) 500–950 K, (ii) 950–1100 K, and (iii) 1100–1200 K have been developed. The energy content of high temperature syngas from conventional coal gasifiers is sufficient to drive the looping process throughout the temperature range considered. Temperatures around 1000 K are advantageous for both the hydrogen production step and the iron oxide reduction step. Simulations of a large number of subsequent cycles indicate that quasi-steady operation is reached after approximately 5 cycles. Comparison of simulations and experiments indicate that the process is currently limited by chemical kinetics at lower temperatures. Therefore, product recirculation should be used for a scaled-up process to increase reactant residence times while maintaining sufficient fluidization velocity.

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Panichkin, A. V., et B. B. Kshibekova. « Assessment of the flux composition effect on the removal efficiency of non-metallic inclusions in high-chromium cast iron ». Dans Challenges of Science. Institute of Metallurgy and Ore Beneficiation, 2023. http://dx.doi.org/10.31643/2023.36.

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The problem to refine high-chromium cast iron melts obtained with the use of a large proportion of scraped metal and scrap is considered herein. Since fluxes containing calcium fluoride are currently considered to be environmentally polluting, it is required to reduce the use of fluorides, or completely replace them. It was shown that a decrease in the melting point of the flux can be achieved with the use of a mixture of calcium and magnesium fluorides or by the introduction of boron oxide into the composition of the fluxes. However, the efficiency of these fluxes, as well as silicocalcium additives and vacuum remelting in the high-chromium cast iron melting when a high proportion of scrap in the charge is used, has not been previously considered. In this regard, the effect of these refining methods on the removal of non-metallic inclusions in high-chromium cast iron of Grade 340Х18HML was experimentally assessed. Thermodynamic calculations were performed for the interaction of magnesium and calcium fluorides with non-metallic oxide inclusions typical of high-chromium cast irons and with oxides used for neutral lining of induction furnaces. It has been shown that fluxes based on boron oxide, magnesium and calcium fluorides and their mixtures effectively remove oxide and sulfide non-metallic inclusions; however, they have a destructive effect on the lining of furnaces, significantly reducing its service life. The addition of silicocalcium reduces the content of sulfides but does not affect the content of non-metallic inclusions in the form of oxides and nitrides. Vacuum remelting effectively reduces the number of nitride inclusions.

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Neyhouse, Jeffrey R., Jose M. Aurrecoechea, J. Preston Montague et John D. Lilley. « Cast Iron-Nickel Alloy for Industrial Gas Turbine Engine Applications ». Dans ASME Turbo Expo 2005 : Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68837.

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Austenitic ductile iron castings have traditionally been used for gas turbine exhaust components that require castability, good machinability, low thermal expansion, and high strength at elevated temperatures. The achievement of optimum properties in austenitic ductile irons hinges on the ability of the foundry to produce nodular graphite in the microstructure throughout the component. In large, complex components, consistently producing nodular graphite is challenging. A high-nickel steel alloy that is suitable for sand castings has been recently developed for industrial gas turbine engine applications. The alloy exhibits similar mechanical and physical properties to austenitic ductile irons, but with improved processability and ductility. This alloy is weldable and exhibits no secondary graphite phase. This paper presents the results of a characterization program conducted on a 35% nickel, high-alloy steel. The results are compared with an austenitic ductile iron of similar composition. Tensile and creep properties from ambient temperature to 760°C (1400°F) are included, along with fabrication experience gained during the manufacture of several sand cast components at Solar Turbines Incorporated. The alloy has been successfully adopted for gas turbine exhaust system components and other applications where austenitic ductile irons have traditionally been utilized. The low carbon content of austenitic steels permits improved weldabilty and processing characteristics over austenitic ductile irons. The enhancements provided by the alloy indicate that additional applications, as both austenitic ductile iron replacements and new components, will arise in the future.

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Ru, Xiangkun, Zhanpeng Lu, Junjie Chen, Hao Peng, Qi Xiong et Jiarong Ma. « Data Compiling and Analysis of Oxide Film Growth on Nickel-Base Alloys in High Temperature Water ». Dans 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-67254.

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A logarithmic relationship for the oxide film thickness of Nickel-based alloys in high temperature water versus immersion time or dissolved hydrogen (DH) is identified based on the compilation and analysis of the experimental data reported in some literature. A theoretical equation is used to quantify the correlations between thickness and time or DH. The logarithmic correlation between inner layer thickness and iron content in alloy matrix and the linear correlation between outer layer thickness and iron content in alloy matrix are primary identified by fitting the experimental data in our own work. The correlation of oxidation kinetics and stress corrosion cracking growth rate is discussed.

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Gao, P., T. Jiang, H. Li, Y. Sun et X. Zhao. « High Phosphorus Content Control Technology at the End of the Converter Blowing&colon ; Principle and Application ». Dans AISTech 2022 Proceedings of the Iron and Steel Technology Conference. AIST, 2022. http://dx.doi.org/10.33313/386/211.

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Coufal, Marek. « APPLICATION OF OZONATION IN PRETREATMENT OF NATURALLY AGGRESSIVE GROUNDWATER WITH HIGH CONTENT OF IRON AND MANGANESE ». Dans 15th International Multidisciplinary Scientific GeoConference SGEM2015. Stef92 Technology, 2011. http://dx.doi.org/10.5593/sgem2015/b31/s12.008.

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Zhang, Yunlong, Yumin Zhang, Wei Zhou, RuiXia Zhang et Ming Hu. « Effect of Cr content on the micro structure and abrasion performance of high chromium cast Iron ». Dans 2015 2nd International Conference on Machinery, Materials Engineering, Chemical Engineering and Biotechnology. Paris, France : Atlantis Press, 2016. http://dx.doi.org/10.2991/mmeceb-15.2016.137.

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Rapports d'organisations sur le sujet "High iron content"

Kanner, Joseph, Dennis Miller, Ido Bartov, John Kinsella et Stella Harel. The Effect of Dietary Iron Level on Lipid Peroxidation of Muscle Food. United States Department of Agriculture, janvier 1995. http://dx.doi.org/10.32747/1995.7604282.bard.

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Biological oxidations are almost exclusively metal ion-promoted reactions and in ths respect iron, being the most abundant, is the commonly involved. The effect of dietary iron levels on pork, turkey and chick muscle lipid peroxidation and various other related compounds were evaluated. Crossbred feeder pigs were fed to market weight on corn-soy rations containing either 62, 131 or 209 ppm iron. After slaughter, the muscles were dissected, cooked and stored at 4°C. Heavily fortifying swine rations with iron (>200 ppm) increase nn-heme iron (NHI), thiobarbituric acid reactive substances (TBARS), and decrease a-tocopherol in cooked stored pork but did not increase warmed-over aroma (WOA). NHI and TBARS were higher in cooked pork from pigs fed high-iron diets. Liver iron correlated with muscle iron. TBARS were strongly related with WOA. The role of dietary vitamin E and ascorbic acid on Fe-induced in vivo lipid peroxidation in swine was also evaluated. Moderate elevation in iron stores had a marked effect on oxidative stress, especially as indicated by liver TBARS. Supplemental vitamin E, and to a lesser extent vitamin C, protect against this oxidative stress. Unsupplementation of Fe in the regular diet of turkeys did not affect body weight, blood hemoglobin level, or iron pool in the liver or muscle. The reason being that it contained "natural" ~120 mg Fe/kg feed, and this amount is high enough to keep constant the pool of iron in the body, liver or muscle tissues. Only Fe-supplementation with high amounts of Fe (500 ppm) significantly increased turkey blood hemoglobin and total iron in the liver, in 1 out of 3 experiments, but only slightly affects iron pool in the muscles. It seems that the liver accumulates very high concentations of iron and significantly regulates iron concentration in skeletal muscles. For this reason, it was very difficult to decrease muscle stability in turkeys through a diet containing high levels of Fe-supplementation. It was shown that the significant increase in the amount of iron (total and "free") in the muscle by injections with Fe-dextran accelerated its lipid peroxidation rate and decreased its a-tocopherol concentration. The level and metabolism of iron in the muscles affects the intensity of in vivo lipid peroxidation. This process was found to ifluence the turnover and accumulation of a-tocopherol in turkey and chick muscles. Treatments which could significantly decrease the amount and metabolism of iron pool in muscle tissues (or other organs) may affect the rate of lipid peroxidation and the turnover of a-tocopherol. Several defense enzymes were determined and found in the turkey muscle, such as superoxide dismutase, catalase, and glutathione peroxidase. Glutathione peroxidase was more active in muscles with a high trend of lipid peroxidation, lmore so in drumsticks than in breast muscles, or muscles with a low a-tocopherol content. The activity of glutathione peroxidase increased several fold in muscle stored at 4°C. Our work demonstrated that it will be much more practical to increase the stability of muscle tissues in swine, turkeys and chickens during storage and processing by increasing the amount of vitamin E in the diet than by withdrawing iron supplementation.

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Rosero, A., J. García et J. Morelo. Varietal selection of high beta-carotene cassava genotypes adapted to dry and humid Caribbean Region of Colombia. Corporación colombiana de investigación agropecuaria - AGROSAVIA, 2018. http://dx.doi.org/10.21930/agrosavia.poster.2018.6.

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Cassava (Manihot esculenta Crantz) is a four staple crop for human consume worldwide after rice, wheat and corn. Mainly, it is used as energetic source due high carbohydrate content; however, improvement of its nutritional quality can contribute to food security, especially in vulnerable region as Caribe, where several factors have threaten with nutritional balance in children. In Colombia, close to of children are born with a birth weight of less than 2,500 grams, which is one of the main risk factors for the mortality of newborns. In children less than 5 years old, 43,3% has zinc deficiency, 24,3% has A vitamin deficiency and 10,6 has Iron deficiency

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Sridhar, Yang et Song. 4VRVLN6 Effects of Solids and Biofilms on Dewpoint and Corrosion in Pipelines. Chantilly, Virginia : Pipeline Research Council International, Inc. (PRCI), janvier 2008. http://dx.doi.org/10.55274/r0011265.

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Internal corrosion occurs where water or other corrosive electrolyte accumulates. This is the principle used in Internal Corrosion Direct Assessment (ICDA). Although ICDA focuses on nominally dry gas with episodes of water upset, the well accepted criteria for dry gas (e.g., water less than 7 lb/MMCF) may be significantly influenced by the presence of bacterial biofilms and hygroscopic solids, such as iron oxide corrosion products and some salts. Therefore, understanding the changes in dew point induced by the presence of these compounds is necessary to better quantify gas quality requirements. The Multielectrode Array Sensor (MAS) probe, originally developed and patented by SwRI was used to study the effect of biofilms and corrosion products on corrosion in high pressure gas mixtures. The project demonstrated that: (i) the MAS probe is sensitive in detecting localized corrosion in wet gas streams at pipeline pressures; (ii) the corrosion rate is sensitive to gas composition/quality; (iii) the presence of biofilm and corrosion products affected the dew point but the current water content specifications for gas are sufficiently conservative that this decrease in dew point is not a concern; and (iv) the corrosion under the biofilm once initiated at high humidity levels did not decrease even upon decrease of humidity to levels lower than needed to initiate corrosion.

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Mueller, C., S. J. Piercey, M. G. Babechuk et D. Copeland. Stratigraphy and lithogeochemistry of the Goldenville horizon and associated rocks, Baie Verte Peninsula, Newfoundland. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328990.

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The Goldenville horizon in the Baie Verte Peninsula is an important stratigraphic horizon that hosts primary (Cambrian to Ordovician) exhalative magnetite and pyrite and was a chemical trap for younger (Silurian to Devonian) orogenic gold mineralization. The horizon is overlain by basaltic flows and volcaniclastic rocks, is intercalated with variably coloured argillites and cherts, and underlain by mafic volcaniclastic rocks; the entire stratigraphy is cut by younger fine-grained mafic dykes and coarser gabbro. Lithogeochemical signatures of the Goldenville horizon allow it to be divided into high-Fe iron formation (HIF; &gt;50% Fe2O3), low-Fe iron formation (LIF; 15-50% Fe2O3), and argillite with iron minerals (AIF; &lt;15% Fe2O3). These variably Fe-rich rocks have Fe-Ti-Mn-Al systematics consistent with element derivation from varying mineral contributions from hydrothermal venting and ambient detrital sedimentation. Post-Archean Australian Shale (PAAS)-normalized rare earth element (REE) signatures for the HIF samples have negative Ce anomalies and patterns similar to modern hydrothermal sediment deposited under oxygenated ocean conditions. The PAAS-normalized REE signatures of LIF samples have positive Ce anomalies, similar to hydrothermal sediment deposited under anoxic to sub-oxic conditions. The paradoxical Ce behaviour is potentially explained by the Mn geochemistry of the LIF samples. The LIF have elevated MnO contents (2.0-7.5 weight %), suggesting that Mn from hydrothermal fluids was oxidized in an oxygenated water column during hydrothermal venting, Mn-oxides then scavenged Ce from seawater, and these Mn-oxides were subsequently deposited in the hydrothermal sediment. The Mn-rich LIF samples with positive Ce anomalies are intercalated with HIF with negative Ce anomalies, both regionally and on a metre scale within drill holes. Thus, the LIF positive Ce anomaly signature may record extended and particle-specific scavenging rather than sub-oxic/redox-stratified marine conditions. Collectively, results suggest that the Cambro-Ordovician Taconic seaway along the Laurentian margin may have been completely or near-completely oxygenated at the time of Goldenville horizon deposition.

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