Relevant bibliographies by topics / Ferrate technologies

Academic literature on the topic 'Ferrate technologies'

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Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "Ferrate technologies"

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Peng, Hao, Jing Guo, Gang Li, Qinzhe Cheng, Yuju Zhou, Zuohua Liu, and Changyuan Tao. "Highly efficient oxidation of chromium (III) with hydrogen peroxide in alkaline medium." Water Science and Technology 79, no. 2 (January 15, 2019): 366–74. http://dx.doi.org/10.2166/wst.2019.056.

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Abstract Many technologies have been proposed to oxidize chromium, such as roasting-water leaching technology and hydrometallurgical methods such as pressure oxidative leaching coupled with oxygen, ozone, permanganate and ferrate, but the problems associated with the high temperature, low overall resource utilization efficiency, high energy consumption, and the environmental pollution, still remain unsolved. This paper focuses on the oxidation process of chromium (III) with hydrogen peroxide (H2O2) in an alkaline medium. The effect of parameters including dosage of H2O2, dosage of NaOH, reaction time, reaction temperature and stirring rate on the oxidation efficiency of chromium were investigated. The oxidation efficiency was significantly affected by the dosage of H2O2 and NaOH, reaction time and reaction temperature took second place; last was the stirring rate. Oxidation efficiency was nearly 100% under the optimal conditions: volume ratio of H2O2 to mass of Cr2(SO4)3 of 2.4 mL/g, mass ratio of NaOH to Cr2(SO4)3 0.6 g/g, reaction time of 90 min, reaction temperature of 90 °C and stirring rate of 500 rpm.
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Thames, Hudson T., and Anuraj Theradiyil Sukumaran. "A Review of Salmonella and Campylobacter in Broiler Meat: Emerging Challenges and Food Safety Measures." Foods 9, no. 6 (June 11, 2020): 776. http://dx.doi.org/10.3390/foods9060776.

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Poultry is one of the largest sources of animal-based protein in the United States. Poultry processing has grown from a small local network of plants to nearly 500 plants nationwide. Two of the most persistent bacteria in poultry processing are Salmonella and Campylobacter. It was not until the introduction of Hazard Analysis and Critical Control Point systems in 1996 that major efforts to reduce bacterial contamination were developed. Traditionally, chlorine has been the industry standard for decontaminating chicken meat. However, antimicrobials such as peracetic acid, cetylpyridinium chloride, and acidified sodium chlorite have replaced chlorine as primary antimicrobials. Despite current interventions, the emergence of stress-tolerant and biofilm-forming Salmonella and Campylobacter is of primary concern. In an effort to offset growing tolerance from microbes, novel techniques such as cold plasma treatment, electrostatic spraying, and bacteriophage-based applications have been investigated as alternatives to conventional treatments, while new chemical antimicrobials such as Amplon and sodium ferrate are investigated as well. This review provides an overview of poultry processing in the United States, major microbes in poultry processing, current interventions, emerging issues, and emerging technologies in antimicrobial treatments.
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Wang, Ao, Chenshuo Lin, Zhen Shen, Zhigang Liu, Hang Xu, Jiapei Cheng, and Xin Wen. "Effects of Pre-Oxidation on Haloacetonitrile and Trichloronitromethane Formation during Subsequent Chlorination of Nitrogenous Organic Compounds." International Journal of Environmental Research and Public Health 17, no. 3 (February 7, 2020): 1046. http://dx.doi.org/10.3390/ijerph17031046.

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The reaction between organic matter and disinfectants leads to the formation of disinfection byproducts (DBPs) in drinking water. With the improvement of detection technology and in-depth research, more than 1000 kinds of DBPs have been detected in drinking water. Nitrogenous DBPs (N-DBPs) are more genotoxic and cytotoxic than the regulated DBPs. The main methods are enhanced coagulation, pretreatment, and depth technologies which based are on conventional technology. Amino acids (AAs) are widely found in surface waters and play an important role by providing precursors from which toxic nitrogenous disinfection by-products (N-DBPs) are generated in chlorinated drinking water. The formation of N-DBPs, including dichloroacetonitrile, trichloroacetonitrile, and trichloronitromethane (TCNM), was investigated by analyzing chlorinated water using ozone (OZ), permanganate (PM), and ferrate (Fe(VI)) pre-oxidation processes. This paper has considered the control of pre-oxidation over N-DBPs formation of AAs, OZ, PM, and Fe(VI) pre-oxidation reduced the haloacetonitrile formation in the downstream chlorination. PM pre-oxidation decreased the TCNM formation during the subsequent chlorination, while Fe(VI) pre-oxidation had no significant influence on the TCNM formation, and OZ pre-oxidation increased the formation. OZ pre-oxidation formed the lowest degree of bromine substitution during subsequent chlorination of aspartic acid in the presence of bromide. Among the three oxidants, PM pre-oxidation was expected to be the best choice for reducing the estimated genotoxicity and cytotoxicity of the sum of the measured haloacetonitriles (HANs) and TCNM without bromide. Fe(VI) pre-oxidation had the best performance in the presence of bromide.
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Węgrzyn, T., J. Piwnik, and D. Hadryś. "Acicular Ferrite in Micro Welding Technologies." Archives of Metallurgy and Materials 59, no. 2 (June 1, 2014): 581–83. http://dx.doi.org/10.2478/amm-2014-0096.

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Abstract Laser is widely applied in micro welding. Apart from that method, welding with micro-jet cooling could be treated as another important method for thin structure welding. Until that moment micro-jet technology is not very popular. An article presents actual information about innovate welding technology with micro-jet cooling in comparison with standard laser welding. There were given information about influence of both micro welding method on metallographic structure of thin steel welds. Amount of AF was tested in two cases.
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Kmita, A., A. Pribulova, M. Holtzer, P. Futas, and A. Roczniak. "Use of Specific Properties of Zinc Ferrite in Innovative Technologies." Archives of Metallurgy and Materials 61, no. 4 (December 1, 2016): 2141–46. http://dx.doi.org/10.1515/amm-2016-0289.

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Abstract Zinc ferrite ZnFe2O4 both in the micro and nano scale is widely used in various fields. The article discusses the structure of this compound and its properties in the nanoscale, which is clearly different from those which the ferrite shows in the microscale. The properties of dust generated electric arc furnace, which can contain up to 40% zinc, substantially in the form of ZnFe2O4 are disscused here. Specific properties (electric, magnetic, thermal) of zinc ferrite nanoparticles determine the very wide possibilities of their use, inter alia as catalysts, absorbents, gas sensors, and a tool to combat cancer.
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Ma, Shao Jian, Gui Fang Wang, Jin Lin Yang, Shao Juan Que, Li Qun Tang, and Jin Peng Feng. "Study on Preparation Process of Zinc Ferrite." Advanced Materials Research 201-203 (February 2011): 1736–40. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.1736.

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Zinc ferrite is usually formed during the roasting of zinc sulfide concentrate with high content of iron and reduces zinc recovery during the leaching of zinc calcine. Because it is difficult to find pure zinc ferrite in nature ore resources or in chemicals market, which impedes the investigation of the reaction characteristics of zinc ferrite and the seek of new technologies for zinc ferrite dissolution, so it is of significance to obtain relatively pure zinc ferrite for further research on zinc calcine leaching. This article investigated the preparation process of zinc ferrite based on the dissolution characteristics of a zinc calcine with 19.38% iron and put forward a method to judge the reaction end point during the leaching of zinc calcine to produce zinc ferrite. The results show that the product of zinc ferrite could be prepared through recovering the leaching residue during leaching the zinc calcine under the initial H2SO4 concentration equal to or larger than 160g/L, and that the leaching end point can be judged by comparing the experimental curve of Zn leaching with the zinc theoretical dissolvability curve.
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Sharma, Virender K., Radek Zboril, and Rajender S. Varma. "Ferrates: Greener Oxidants with Multimodal Action in Water Treatment Technologies." Accounts of Chemical Research 48, no. 2 (February 10, 2015): 182–91. http://dx.doi.org/10.1021/ar5004219.

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Kisic, Milica, Nelu Blaz, Kalman Babkovic, Andrea Maric, Goran Radosavljevic, Ljiljana Zivanov, and Mirjana Damnjanovic. "Performance analysis of a flexible polyimide based device for displacement sensing." Facta universitatis - series: Electronics and Energetics 28, no. 2 (2015): 287–96. http://dx.doi.org/10.2298/fuee1502287k.

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In this work, two variations of the displacement sensor, based on the heterogeneous integration process of traditional fabrication technologies PCB (Printed Circuit Board) and LTCC (Low Temperature Co-fired Technology) with a flexible polyimide foil are presented. The proposed sensor uses the coil as an essential part, spacer and a polyimide foil as a flexible membrane with a piece of ferrite attached to it. With the displacement of the polyimide foil, the ferrite gets closer to the coil causing an increase in its inductance and a decrease of the resonant frequency of the system (coil, ferrite and antenna). Simulation results showed that sensors with equal outer dimensions but different internal structures exhibit different performances. Two prototypes of the sensor with different ferrite dimensions are designed, fabricated and characterized. Finally, their performances are compared.
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Liu, Jie. "SLC Technologies for Ferroalloy Part Surface Modification." Advanced Materials Research 941-944 (June 2014): 2194–97. http://dx.doi.org/10.4028/www.scientific.net/amr.941-944.2194.

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Experiments on selective laser sintering of iron based alloy and nano-Al2O3 ceramic bulk materials are carried out and effect of sintering parameters on the process is analyzed systematically. A reasonable selective laser sintering technique which can be used to fabricate parts with free shape is obtained and verified with a multilayer sintering experiment. The component and the microstructure of the sintering production is tested. The influences of parameters and the amount of nano-Al2O3 on microstructure and microhardness of the sintering parts are studied. Laser sintering iron-based alloy experiments show that: microhardness has been noticeably improved. It is indicated that with the selective laser sintering technique obtained above, nano-alumina can be processed to manufacture three-dimension parts with free shape. With the addition of Al2O3 and the increase of composite parts of the grain gradually thinning, microhardness gradually improved nanocomposite parts for the microstructure of the dendrite skeleton-shaped crystal and the plane together, the internal Al2O3 dispersion organizations to strengthen the implicit crystal martensite and ferrite mixed organizations.
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Pan, An Xia. "Toughness and Internal Friction of Weld Metal Welded by High-Current MAG Welding." Advanced Materials Research 328-330 (September 2011): 1077–81. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.1077.

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Low-temperature impact test on four different kinds of weld metal welded by different technologies of high-current MAG welding was carried out in this paper. The results show that different materials and different welding parameters have different effect on impact energy. As the chemical analysis and observation from the optical microscope show that When welding material contains appropriate C, Si, Ti, fine acicular ferrite forms in it; on the contrary, crisp and thick bainite appears. Compares to acicular ferrite which has an Akv>27J at -27°C and better toughness, bainite has a poor toughness and an Akv<27J. The internal friction experiments show that there are two internal friction peaks - Snoek and SKK. The peak is clear when the microstructure is bainite, on the other side, the microstructure is acicular ferrite.
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Dissertations / Theses on the topic "Ferrate technologies"

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Гаркушина, Анна Олексіївна. "Використання феррату калію в процесах кондиціонування води." Master's thesis, КПІ ім. Ігоря Сікорського, 2019. https://ela.kpi.ua/handle/123456789/30761.

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Магістерська дисертація: 128 ст., 39 табл., 12 рис, 125 першоджерел, 2 додатки. Метою роботи є дослідження ефективності використання феррату калію у процесах кондиціонування води, а саме окислення ферратними комплексами полютантів різної природи; визначення ефективності доочищення аналізованих зразків шляхом коагуляції; можливість використання феррату калію у якості інгібітору корозії. Об’єктом дослідження в даній роботі є процеси кондиціонування води. Предмет дослідження: ферратні технології в процесах кондиціонування води. Загальною робочою гіпотезою є те, що феррат більш ефективний та менш шкідливий, ніж існуючі традиційні окислювальні технології, такі як хлорування, хлорамінування та окислення перманганату; і за показниками порівнюється з передовими технологіями, такими як озонування або окислення діоксиду хлору, що є більш дорогими, більш небезпечними або вимагають спеціальних експертиз для роботи. Іншою гіпотезою є те, що феррат калію можна застосовувати у процесах інгібування корозії. В роботі представлено результати досліджень процесів коагуляції, окислення та інгібування корозії. Виконано стислий аналіз результатів досліджень в області ферратних технологій в області кондиціонування води.
Master dissertation: 128 p., 39 tables, 12 pics, 125 primary sources, 2 addition. The purpose of the study is to investigate the efficiency of the use of potassium ferrate in water conditioning processes. Oxidation of different nature pollutants by ferrate complexes. Determination of the efficiency of purification of the analyzed samples by coagulation. The possibility of using potassium ferrate as a corrosion inhibitor. Research object: water conditioning. Subject of research: ferrate technologies in the processes of water conditioning. The general working hypothesis is that ferrat is more effective and less harmful than existing traditional oxidizing technologies such as chlorination and oxidation of permanganate; and compared with advanced technologies such as ozonation or oxidation of chlorine dioxide, which are more expensive, more dangerous or require special expertise to work. Another hypothesis is that potassium ferrate can be used in corrosion inhibition processes. The work presents the results of investigations of coagulation processes, oxidation and corrosion inhibition. Performed analysis of the results of research in the field of ferrite technologies for water conditioning.
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Kamf, Tobias. "Automated Production Technologies and Measurement Systems for Ferrite Magnetized Linear Generators." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-330866.

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The interest in breaking the historical dependence on fossil energy and begin moving towards more renewable energy sources is rising worldwide. This is largely due to uncertainties in the future supply of fossil fuels and the rising concerns about humanity’s role in the currently ongoing climate changes. One renewable energy source is ocean waves and Uppsala University has since the early 2000s been performing active research in this area. The Uppsala wave energy concept is centered on developing linear generators coupled to point absorbing buoys, with the generator situated on the seabed and connected to the buoy on the sea surface via a steel wire. The motion of the buoy then transfers energy to the generator, where it is converted into electricity and sent to shore for delivery into the electrical grid. This thesis will mainly focus on the development and evaluation of technologies used to automate the manufacturing of the translator, a central part of the linear generator, using industrial robotics. The translator is a 3 m high and 0.8 m wide three sided structure with an aluminum pipe at its center. The structure consists of alternating layers of steel plates (pole-shoes) and ferrite magnets, with a total of 72 layers per side. To perform experiments on translator assembly and production, a robot cell (centered on an IRB6650S industrial robot) complimented with relevant tools, equipment and security measures, has been designed and constructed. The mounting of the pole-shoes on the central pipe, using the industrial robot, proved to be the most challenging task to solve. However, by implementing a precise work-piece orientation calibration system, combined with selective compliance robot tools, the task could be performed with mounting speeds of up to 50 mm/s. Although progress has been made, much work still remains before fully automated translator assembly is a reality. A secondary topic of this thesis is the development of stand-alone measurement systems to be used in the linear generator, once it has been deployed on the seabed. The main requirements of such a measurement system is robustness, resistance to electrical noise, and power efficiency. If possible the system should also be portable and easy to use. This was solved by developing a custom measurement circuit, based on industry standard 4–20 mA current signals, combined with a portable submersible logging unit. The latest iteration of the system is small enough to be deployed and retrieved by one person, and can collect data for 10 weeks before running out of batteries. Future work in this area should focus on increasing the usability of the system. The third and final topic of this thesis is a short discussion of an engineering approach to kinetic energy storage, in the form of high-speed composite flywheels, and the design of two different prototypes of such flywheels. Both designs gave important insights to the research group, but a few crucial design faults unfortunately made it impossible to evaluate the full potential of the two designs.
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Péron, Ronan. "Etude théorique et expérimentale de circulateurs ultraminiatures en technologie uniplanaire multicouches." Brest, 1998. http://www.theses.fr/1998BRES2009.

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_ Depuis quelques annees, on assiste de plus en plus, pour les microondes, a l'ouverture de marches grand public aussi bien dans le domaine des telecommunications que dans d'autres secteurs d'activites (developpement des radiocommunications mobiles, diffusion t. V. Et radio haute definition par satellite, marche de l'electronique automobile etc. ). Pour satisfaire l'ensemble des specifications associees a ces marches, les dispositifs doivent repondre, aujourd'hui, a un certain nombre de contraintes au niveau de l'integration des materiels : des contraintes economiques, des contraintes d'encombrement et de poids pour les dispositifs integres dans les systemes embarques, ainsi que des contraintes electriques, notamment en relation avec l'evolution des systemes actuels vers les hautes frequences. _ parallelement, dans ces systemes de communication, une antenne unique est generalement utilisee par souci de simplification, a la fois pour l'emission et la reception. Naturellement, il est cependant necessaire de pouvoir assurer la fonction de diplexage entre les voies emission et reception, qui operent dans des bandes de frequences quasi-contigues, voire identiques. Pour cela, l'utilisation de circulateurs a elements semi-localises sur ferrite apparait comme la solution la plus appropriee, et ce en relation avec l'ensemble des contraintes imposees. Neanmoins, a ce jour, etant donne les technologies d'integration classiquement utilisees (typiquement, de type microruban et triplaque), cette solution presente plusieurs limitations, principalement associees au procede technologique de type multiface mis en uvre (en particulier de par la presence de trous de retour de masse), ce qui induit des problemes de cout de realisation, de miniaturisation des dispositifs, de montee en frequence etc. _ afin de pallier ces inconvenients, ce travail propose l'utilisation de la technologie uniplanaire, pour l'integration complete de circulateurs a elements semi-localises, directement sur substrat ferrite. Par ailleurs, le choix d'une polarisation magnetique de type radial du materiau ferrite a ete retenue. Un modele theorique du circulateur uniplanaire, ainsi que des modeles des materiaux magnetiques et des elements electriques de base du dispositif, sont presentes tout d'abord. Par la suite, pour valider le formalisme de dimensionnement du circulateur uniplanaire, nous presentons plusieurs resultats experimentaux, et ce pour des dispositifs respectivement en bandes s, c, et ku (ce qui constitue, a priori a ce jour, une reference d'un point de vue de la montee en frequence). Enfin, nous demontrons l'interet evident d'une telle approche de conception de type uniplanaire, en particulier pour l'elargissement de la bande passante des circulateurs ultraminiatures, voire pour l'amelioration des performances propres de ces dispositifs (optimisation de l'adaptation, etc. ).
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Briney, Emmanuel. "Contribution à l'intégration d'un circulateur HF : Caractérisations magnétiques de couches de ferrite." Limoges, 2002. http://www.theses.fr/2002LIMO0023.

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Le but de ce travail, qui a débuté en collaboration avec la DGA, est d'apporter les éléments nécessaires à l'intégration d'un circulateur fonctionnant dans la bande V (60-70 GHz). Le premier de mes objectifs a été de limiter les craquelures apparaissant au sein de dépôts d'hexaferrite de baryum étudiés auparavant en réalisant des couches métalliques à base de titane, d'or ou de cuivre et qui constitueront le plan de masse du futur circulateur. La pulvérisation cathodique magnétron a été utilisée à ces fins. L'utilisation d'une structure Si/Ti/Au semble être la plus adéquate. Le second de mes objectifs est de caractériser les couches de ferrites réalisées au laboratoire afin d'évaluer leur qualité en hyperfréquence. J'ai donc mis au point une méthode en cavité à 56,7 GHz capable de mesurer la largeur de raie de gyrorésonance, paramètre significatif des pertes dans un matériau magnétique. Des mesures sur des pastilles d'hexaferrite de strotium massif usiné ont montré sa viabilité
The goal of this work is to contribute to the elaboration of a ferrite integrated circulator working in V band (60 - 70 GHz). My first work was to diminish the cracks which appear in barium ferrite films deposited on silicon (100) substrates. For this purpose, i have realized metallic films made of titanium, gold or copper on silicon prior to the ferrite deposition. They permit to adapt the stress between ferrite films and silicon and also constitute the circulator ground plane. We have chosen the magnetron sputtering technique to deposit these metallic films. To evaluate the barium ferrite films quality, i have developed a new characterization method which permits us to determine the gyromagnetic linewidth. It is based upon the ferrite absorption near the gyrotropic frequency in a metal cylindrical cavity at 56. 7 GHz. Tests on oriented bulk strontium hexaferrite have demonstrated its efficiency
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Elmael, Abdusalam Mohamed. "Les déterminants du succès de l’Intranet pédagogique dans trois écoles de management (Clermont-Ferrand, Strasbourg, Tripoli)." Paris 10, 2011. http://www.theses.fr/2011PA100195.

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Cette recherche porte sur l’utilisation des technologies d’information et de communication (TIC) et notamment l’intranet chez les enseignants et les étudiants des trois écoles de management (ESC Clermont—Ferrand, EM Strasbourg, EM Tripoli). En nous inspirant de plusieurs études effectuées sur les modèles d’acceptation de technologie et sur les systèmes d’information, nous avons essayé de construire notre modèle de recherche qui explique l’usage des sites intranet. Des lors, la premièrepartie de notre travail est consacrée a la revue de littérature, où nous décrivons les principaux apports des chercheurs dans le domaine, avant de présenter dans la deuxième partie notre modèle de recherche que nous voulons valider. A cet effet, nous avons mené une étude empirique sur un échantillon d’étudiants et d’enseignants des trois écoles de management. Ainsi, à travers l’analyse de fiabilité et la factorisation des construits en SPSS dans un premier temps, puis en utilisant la méthode d’équations structurelles en Smart PLS pour « épurer » le modèle, nous avons aboutis aux facteurs influençant le succès du site intranet : la valeur patrimoniale et la maturité de l’utilisateur, tandis que les impacts de la valeur d’usage et les effets du site intranet ont été réfutées. Ces résultats aux différentes implications théoriques, méthodologiques et managériales sont synthétisés et reprises dans la conclusion générale de notre recherche afin de discuter des enjeux, des limites et des perspectives futures qui découlent de notre approche
This research focuses on the use of Information and Communication Technology (ICT) and Intranet by teachers and students from three schools of management (ESC Clermont-Ferrand, EM Strasbourg, EM Tripoli). Being inspired by several studies on models of acceptance of technology and information systems, we try to construct our research model that explains the use of Intranet websites. Therefore, the first part of our work will be devoted to literaturereview, in which we describe the main contributions of researchers in the field, before presenting the second part of our proposed research model which we will test its validity. For this purpose, we carried out an empirical study on a sample of students and teachers from the three management schools. Thus, through the reliability analysis and factoring in SPSS as well as by using the structural equation Smart PLS to "cleanse" the model, we obtain the factors influencing the assessment of Intranet website namely the patrimonial value, the value of use, maturity of the user and the effects of the Intranet website. These results along with different theoretical implications, methodological and managerial skills will be synthesized and incorporated in the overall conclusion of the study in order to discuss challenges, limitations and future perspectives arising from this new approach
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Strickler, Tara Leigh. "Improving Assisted Reproductive Technologies in the Endangered Black-Footed Ferret: Artificial Insemination and Sperm Cryopreservation." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1267057806.

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Noutehou, Nathan. "Conception de circulateurs et isolateurs pour des applications spatiales : nouvelles technologies d'intégration." Thesis, Brest, 2019. http://www.theses.fr/2019BRES0033/document.

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L’objectif de cette thèse est d’explorer de nouvelles technologies permettant de faciliter l’intégration des isolateurs dans les chaînes radiofréquences de satellites. Ces composants sont utilisés pour contrôler l’adaptation des amplificateurs dans les sections d’entrée et de sortie des équipements RF bas niveaux. Nous proposons deux voies de réalisation de ces isolateurs. Une première voie basée sur l’utilisation de matériaux ferricomposites est étudiée pour concevoir des composants en bande Ku. Une deuxième voie, basée sur l’utilisation d’hexaferrites de strontium et de baryum préorientés, a été étudiée pour concevoir des composants auto-polarisés (sans aimants) en bandes Q et Ka
The goal of this PhD thesis is to explore new technologies that make possible to improve the integration of isolators in radiofrequency chain of satellites. These components are especially used to control matching of amplifiers.We propose two ways of producing these isolators. At first, ferricomposite materials are studied to design low-cost isolators at Kuband.Then, we studied pre-oriented strontium or barium hexaferrites to design self-biased components (without magnets) for Q and Ka band frequencies
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Dalbert, Vincent. "Etude du comportement en tribocorrosion d’aciers inoxydables en milieux aqueux : Evaluation de la synergie entre sollicitations mécaniques superficielles et réactions électrochimiques de surface, effet de la microstructure." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0060/document.

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Ce travail porte sur l’étude du comportement d’un acier inoxydable (matériau passivable) en situation de tribocorrosion. L’accent a été mis sur l’effet de synergie existant entre la sollicitation mécanique et l’électrochimie du milieu, conduisant à une usure significative. Dans un premier temps, une méthodologie a été mise en place, sur une microstructure ferritique, pour quantifier cette synergie et ses deux composantes que sont l’électrochimie accélérée par l’usure (E.A.U.) et l’usure accélérée par l’électrochimie (U.A.E.). La première représente la dissolution du matériau consécutive à l’action mécanique du pion sur la surface. La seconde rend compte des modifications des propriétés mécaniques de la surface induites par l’électrochimie. Les paramètres de la sollicitation mécanique étant tout d’abord fixés, l’évolution des composantes de l’effet de synergie a été étudiée en fonction du caractère oxydant d’un milieu acide, modifié à l’aide d’un potentiostat. Un minimum d’usure, déterminé sous polarisation cathodique est considéré comme l’usure mécanique de référence. Dans le domaine passif, pour des potentiels passifs croissants, l’U.A.E. diminue suite à un épaississement de la partie oxyde du film passif, renforçant les propriétés mécaniques de la surface. A l’inverse, l’augmentation de l’E.A.U. s’explique par une intensité supérieure des réactions d’oxydation sur la surface mise à nu au cours du frottement. Ceci conduit à une usure maximale pour un potentiel passif intermédiaire. L’évolution des composantes de l’effet de synergie a ensuite été investiguée en potentiel libre sous les influences croisées de l’acidité du milieu et du temps de latence. L’E.A.U. augmente avec l’acidité en lien avec une dissolution plus prononcée mais diminue pour un temps de latence plus court suite à la diminution du couplage galvanique entre la trace d’usure partiellement repassivée et la zone cathodique. La diminution du temps de latence limite la maturation du film passif. En milieu acide, l’U.A.E. ne diminue pas car le film passif, majoritairement constitué d’oxyde, conserve son caractère abrasif. A l’inverse en milieu neutre, la proportion d’hydroxyde étant alors majoritaire, l’U.A.E. diminue. Dans un second temps, l’influence de la microstructure sur le comportement à la tribocorrosion a été mise en évidence en fonction des paramètres étudiés précédemment. Après traitement thermique, l’acier inoxydable présente une microstructure ferrito martensitique. En considérant l’usure totale, l’effet de la microstructure apparait négligeable sur la tenue à la tribocorrosion en potentiel libre, dans les conditions étudiées. Le biphasage est par contre bénéfique lorsque le frottement se déroule sous potentiels cathodiques ou passifs grâce à un transfert d’effort de la martensite à la ferrite sous-jacente. De même, l’effet délétère du film passif sur les propriétés mécaniques de la surface est réduit lorsque la microstructure comporte une phase dure (U.A.E.)
This study deals with the behaviour of a stainless steel (passive material) undergoing tribocorrosion. Focus has been put on the synergistic effect existing between mechanical action and medium electrochemistry, leading to significant wear. In a first step, a methodology has been set up, on a ferritic microstructure, to quantify this synergy as well as its two compounds that are the wear-accelerated electrochemistry (W.A.E.) electrochemistry-accelerated wear (E.A.W.). The former stands for the material dissolution following the mechanical action of the pin on the surface. The latter accounts for the modifications of the surface mechanical properties induced by electrochemistry. The parameters of the mechanical action being set, the evolution of the synergistic effect compounds has been studied as a function of the oxidizing feature of an acidic medium, modified by using a potentiostat. A minimum of wear, determined under cathodic polarisation is considered as the reference mechanical wear. In the passive domain, for higher passive potentials, E.A.W. decreases due to the thickening of the oxide part of the passive film, enhancing the mechanical properties of the surface. On the contrary, the W.A.E. increase is explained by more intense oxidising reactions occurring on the bare material revealed to the electrolyte by sliding. This leads to a maximum wear obtained at an intermediate passive potential. The evolution of the synergistic effect compounds has then been investigated under free potential condition with crossed influences of the medium acidity and the latency period. The more acidic the medium, the greater the W.A.E. because dissolution is enhanced. However, it decreases with a shorter latency period because of a weaker galvanic coupling between the partially repassivated wear track and the cathodic surface. The latency period decrease limits the passive film maturation. In acidic medium, E.A.W. does not decrease because the passive film, mainly composed of oxide, keeps its abrasive feature. To the opposite, in neutral medium, the hydroxide proportion being majority, E.A.W. decreases. In a second step, the microstructure influence on the tribocorrosion behaviour has been evidenced as a function of the previously studied parameters. After a thermal treatment, the stainless steel shows a ferrite-martensite microstructure. Considering global wear, the microstructure effect appears to be negligible on the tribocorrosion resistance in free potential situation, under the studied conditions. On the contrary, a two-phase microstructure is beneficial when sliding is performed under cathodic or passive potentials thanks to a mechanical transfer occurring from the martensite to the underlying ferrite. Moreover, the detrimental effect of the passive film on the surface mechanical properties is reduced when the microstructure involves an hard phase (E.A.W.)
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Ledieu, Marc. "Contribution à la caractérisation : hyperfréquence des matériaux." Tours, 2005. http://www.theses.fr/2005TOUR4025.

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On présente différentes avancées relatives à la caractérisation des propriétés électromagnétiques des matériaux en lignes de transmission ou en espace libre. La mesure des spectres de perméabilité de couches minces ferromagnétiques par perturbation de spire a été étudiée. Des inter-comparaisons internationales associées à la conception d'échantillons de référence basés sur l'utilisation originale de méta-matériaux ont permis de valider la technique. Dans un deuxième temps, une cellule de caractérisation des matériaux ferrite doux sous contrainte mécanique a été développée. Une démarche expérimentale a permis de valider son fonctionnement. On a défini les limites d'exploitation de la technique et proposé des améliorations. On a enfin étudié le contrôle non destructif des propriétés électromagnétiques de matériaux sur la base d'une instrumentation de mesure en champ proche. On a démontré l'intérêt de cette approche pour identifier des dispersions locales de propriétés et les quantifier
Advances in microwave material characterization using transmission line and free space techniques are presented. Single-coil perturbation measurement of thin ferromagnetic films is studied. International cross-measurements provide a first step in the technique validation. By the design of new reference samples based on meta-materials, we improved the apparatus calibration process. As magnetic materials may be mechanical stress sensitive, we developed coaxial cells to measure the permeability spectra of ferrite under compressive stress. Experimental validation of the cells is presented. Finally, a microwave near-field measurement technique is used to obtain a non-destructive imaging of material properties. We demonstrated the ability of our approach to detect and quantify local dispersions of electromagnetic properties
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Guennou, Annaig. "Etude Magnétostatique et Electromagnétique de Circulateurs Miniatures pour les Modules Actifs Emission/Réception des Systèmes de Télécommunications." Phd thesis, Université de Bretagne occidentale - Brest, 2007. http://tel.archives-ouvertes.fr/tel-00836843.

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Ce travail porte sur la modélisation électromagnétique des circulateurs à jonction-Y polarisé non-uniformément en vue de concevoir et de réaliser des structures ultraminiatures. L'originalité de cette étude repose sur l'approche théorique permettant de mieux décrire le comportement électromagnétique de la structure. Cette approche tient compte de la non-uniformité des différents champs apparaissant dans la structure (champ statique de polarisation, champs démagnétisants et champ interne) ainsi que de l'état d'aimantation du matériau ferrite. La réalisation de circulateurs microruban en bande X a permis de confronter des résultats expérimentaux aux réponses théoriques obtenues à partir de notre approche théorique et d'observer la dégradation des performances du dispositif due à la non-uniformité des champs statiques. A l'aide de modifications apportées à l'analyse électromagnétique, les réponses de dispositifs à base d'hexaferrites autopolarisés fonctionnant à la rémanence sont obtenues.
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Books on the topic "Ferrate technologies"

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Congrès régional des enseignants de français (1991 Université de Ferrare). Nouvelles technologies et enseignement du français: Actes du Congrès régional des enseignants de français, Université de Ferrare, 17-18-19 janvier 1991. Bologna: Edizioni Analisi, 1993.

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Book chapters on the topic "Ferrate technologies"

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Heřmánková, Monika, Roman Vokáč, Jan Slunský, and Jan Filip. "Field Study IV: Arsenic Removal from Groundwater by Ferrate with the Concurrent Disinfecting Effect: Semi-Pilot On-site Application." In Advanced Nano-Bio Technologies for Water and Soil Treatment, 299–314. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-29840-1_13.

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Jiang, Jia-Qian. "Field Study III: Evidence Gained from Site Studies for the Performance of Ferrate(VI) in Water and Wastewater Treatment." In Advanced Nano-Bio Technologies for Water and Soil Treatment, 289–97. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-29840-1_12.

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Machala, Libor, Petr Zajíček, Jan Kolařík, Tomáš Mackuľak, and Jan Filip. "Ferrates as Powerful Oxidants in Water Treatment Technologies." In Advanced Nano-Bio Technologies for Water and Soil Treatment, 177–201. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-29840-1_8.

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Uzlov, O., A. Malchere, V. Bolshakov, and Claude Esnouf. "Investigation of Acicular Ferrite Structure and Properties of C-Mn-Al-Ti-N Steels." In Materials and Technologies, 209–312. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-460-x.209.

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Matz, Richard. "Integration Technologies for Ferrites and Power Inductors in Ceramic Circuit Boards." In Ceramic Integration and Joining Technologies, 231–65. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118056776.ch8.

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Lacina, Petr, and Michal Hegedüs. "Field Study V: Combined Oxidation Technology Using Ferrates (FeIV–VI) and Hydrogen Peroxide for Rapid and Effective Remediation of Contaminated Water—Comprehensive Practically Focused Study." In Advanced Nano-Bio Technologies for Water and Soil Treatment, 315–31. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-29840-1_14.

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Jasrotia, R. "Spinel Ferrite Based Nanomaterials for Water Remediation Application." In Materials Research Foundations, 218–45. Materials Research Forum LLC, 2021. http://dx.doi.org/10.21741/9781644901595-6.

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The decreasing levels of consumable water on earth have been a serious issue and this issue makes the researchers and scientists develop new technologies for the purification of polluted water. Several reports have been carried on wastewater remediation by utilizing spinel ferrite-based nanoparticles and their composites. The spinel ferrites-based nanoparticles utilized for wastewater treatment was cost effective, chemically stable, easily retrieved and reusable. The present work addresses the various fabrication techniques for the preparation of spinel ferrite-based nanoparticles and their utilization for the removal of organic and inorganic pollutants through the adsorption paths.
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İsmail Tosun, Yildirim. "Apatite/Salt Slurry Emission Control of Post Combustion Flue Gas of Lignite and Coal in Fluidized Bed - Double Circulation Microwave Column Adsorber." In Environmental Change and Sustainability [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.95296.

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Heated Ca apatite slimes in microwave radiated salt slurries are one of the most promising technologies for advanced fuel energy storage with favorable economic potential and intrinsic properties. The development of solid pellet technology for molten salt is a key issue in the heat transport processing. The apathite phosphate, slurry salt in the slime-salt bath mixes was investigated under microwave radiation heating to result in insoluble sorbent fines dissolved in porous basket. The insoluble consists of noble metal fission products, such as Pb, Zn, Cu. In this study, there have been very few transport studies of wet steam alkali slurry (metal fines-molten alkali salt mixture). Bath ferrite/apatite particle size changed the heat conductivity to salt bath. A major reason is that the retention time in fixed film processes is longer than in solid–gas processes. This allows more time to the heat absorption for cracking to the desorbed persistent compounds. Furthermore, radiated ferrite by microwave allows a sufficient intimate contact between coal and biomass surface pores and gas atmosphere in the furnace due to more pyrolysis gas desorption. Bubbling slurry of sorbent porosity decreases while temperature decreases. There was a critical porous structure of bubbling sorbent bath which is a factor that determines to a great extent both the sorbent rate and degree of boiling it was found that, a porous slurry bath over 45% was more efficient with radiated a low amount ferrite below weight rate of 15% in microwave column.
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İsmail Tosun, Yildirim. "Apatite/Salt Slurry Emission Control of Post Combustion Flue Gas of Lignite and Coal in Fluidized Bed - Double Circulation Microwave Column Adsorber." In Environmental Issues and Sustainable Development. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.95296.

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Heated Ca apatite slimes in microwave radiated salt slurries are one of the most promising technologies for advanced fuel energy storage with favorable economic potential and intrinsic properties. The development of solid pellet technology for molten salt is a key issue in the heat transport processing. The apathite phosphate, slurry salt in the slime-salt bath mixes was investigated under microwave radiation heating to result in insoluble sorbent fines dissolved in porous basket. The insoluble consists of noble metal fission products, such as Pb, Zn, Cu. In this study, there have been very few transport studies of wet steam alkali slurry (metal fines-molten alkali salt mixture). Bath ferrite/apatite particle size changed the heat conductivity to salt bath. A major reason is that the retention time in fixed film processes is longer than in solid–gas processes. This allows more time to the heat absorption for cracking to the desorbed persistent compounds. Furthermore, radiated ferrite by microwave allows a sufficient intimate contact between coal and biomass surface pores and gas atmosphere in the furnace due to more pyrolysis gas desorption. Bubbling slurry of sorbent porosity decreases while temperature decreases. There was a critical porous structure of bubbling sorbent bath which is a factor that determines to a great extent both the sorbent rate and degree of boiling it was found that, a porous slurry bath over 45% was more efficient with radiated a low amount ferrite below weight rate of 15% in microwave column.
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Gutierrez Jr., Ray. "The Crime Beat." In Advances in Media, Entertainment, and the Arts, 137–46. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-7998-3844-9.ch012.

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This chapter examines the future of crime journalism, specifically centered on how technologies, data, and virtual worlds might shape the investigation and help to capture criminals. With cameras everywhere, there may be a witness on any corner. Smart phones, television, and robotic pets record subversively every minute of one's life. Facial recognition can be used to ferret through a large crowd seeking repeat offenders amidst a monitored society.
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Conference papers on the topic "Ferrate technologies"

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Popov, Andrey M., Timur A. Labutin, Valentina V. Litvinova, and Nikita B. Zorov. "Influence of ferrite surface microstructure on laser ablation." In Advanced Laser Technologies 2007, edited by Ivan A. Shcherbakov, Risto Myllylä, Alexander V. Priezzhev, Matti Kinnunen, Vladimir I. Pustovoy, Mikhail Y. Kirillin, and Alexey P. Popov. SPIE, 2007. http://dx.doi.org/10.1117/12.804116.

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Menicanin, Aleksnadar, Miloljub Lukovic, Nelu Blaz, Dejan Movrin, and Ljiljana Zivanov. "Design and Fabrication of Ferrite Inductor Using 3D Printed Spiral Coil and Ferrite Disc." In IEEE EUROCON 2019 -18th International Conference on Smart Technologies. IEEE, 2019. http://dx.doi.org/10.1109/eurocon.2019.8861829.

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Hsia, I., H. Y. Yang, and N. G. Alexopoulos. "Microstrip antennas on ferrite substrates." In International Symposium on Antennas and Propagation Society, Merging Technologies for the 90's. IEEE, 1990. http://dx.doi.org/10.1109/aps.1990.115124.

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Dhumal, Jyoti, S. S. Bandgar, Manisha Phadatare, and G. S. Shahane. "Citrate capped Fe0.7Mn0.3Fe2O4 ferrite nanoparticles for hyperthermia." In EMERGING TECHNOLOGIES: MICRO TO NANO (ETMN-2017): Proceedings of the 3rd International Conference on Emerging Technologies: Micro to Nano. Author(s), 2018. http://dx.doi.org/10.1063/1.5047716.

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Otani, Yukitoshi, Yasuhiro Mizutani, and Norihiro Umeda. "Three-dimensional optical control of magnetic levitation by temperature sensitive ferrite." In International Symposium on Optomechatronic Technologies, edited by Yves Bellouard, Yukitoshi Otani, and Kee S. Moon. SPIE, 2007. http://dx.doi.org/10.1117/12.754428.

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Shmat'ko, A. A., V. N. Mizernik, and E. N. Odarenko. "Ferrite Magnetophotonic Crystal for Terahertz Tunable Filter." In 2019 International Conference on Information and Telecommunication Technologies and Radio Electronics (UkrMiCo). IEEE, 2019. http://dx.doi.org/10.1109/ukrmico47782.2019.9165453.

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Verma, Neerav, Doug P. Fairchild, Fredrick F. Noecker, Mario L. Macia, and Nathan E. Nissley. "Advanced Strain-Based Design Pipeline Welding Technologies." In 2014 10th International Pipeline Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/ipc2014-33079.

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To meet the increasing worldwide demand for natural gas, there is a need to safely and economically develop remotely located resources. Pipeline construction is a major activity required to connect these remote resources to markets. Such pipeline routes may cross areas containing geohazards such as discontinuous permafrost, active seismicity and offshore ice gouging. These pipelines may be subjected to longitudinal strains above 0.5%. To safely design pipelines for such conditions, a strain-based design (SBD) approach can be used in addition to conventional allowable stress designs (ASD). Significant pipeline construction cost savings can be achieved with the use of higher strength steels (X70+) due to reduced pipe wall thicknesses (less steel) and faster girth welding. However, a robust welding technology for higher strength SBD pipelines is often a technology gap depending on the target level of longitudinal strain that needs to be accommodated, since such applications often demand excellent weld toughness at low temperatures (−15°C) and high tensile strength (>120ksi). This paper discusses the development of an enabling welding technology that offers a superior combination of strength and toughness compared to commercially available technologies. Acicular ferrite interspersed in martensite (AFIM) has been previously identified as a useful high strength weld metal microstructure that can be applied in field pipeline construction. This paper describes how this microstructure has been used to create welds with excellent strength overmatch and good ductile tearing resistance for X80 SBD pipelines. This approach has been implemented for mainline, double-joining and repair welding applications. This paper describes the welding procedures, mechanical properties achieved, estimated strain capacities, and the results of a full-scale pipe strain capacity test.
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Ishikawa, Nobuyuki, Mitsuru Okatsu, Junji Shimamura, Shigeru Endo, Nobuo Shikanai, Joe Kondo, and Ryuji Muraoka. "Development and Production of Ultra-High Strength Linepipes With Dual-Phase Microstructure for High Strain Application." In ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2007. http://dx.doi.org/10.1115/omae2007-29561.

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Extensive studies to develop high strength linepipes with higher deformability have been conducted. One of the key technologies for improving deformability is dual-phase microstructural control. Steel plate with ferrite-bainite microstructure can be obtained by applying Thermo-mechanical controlled processing, TMCP, made up with controlled rolling and accelerated cooling process. Low carbon-boron free steels were used to enable the ferrite formation during cooling after controlled rolling, and the accelerated cooling process with ultimate cooling rate enabled to achieve high strength of up to X120 grade. On-line heating process by induction device was also applied subsequently after accelerated cooling in order to improve Charpy energy of the base material and homogeneity of material properties in the plate. Trial production of X120 high deformability linepipe was also conducted by applying dual-phase microstructural control. Microstructural and mechanical properties of X120 linepipe are introduced in this paper.
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Iqbal, Muhammad Ali, Safdar Raza, and Ahsan Javed. "Ferrite Incorporated Wireless Power Transfer Efficiency Improvement Systems." In 2020 3rd International Conference on Computing, Mathematics and Engineering Technologies (iCoMET). IEEE, 2020. http://dx.doi.org/10.1109/icomet48670.2020.9074138.

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Galkina, Taisiya A., and Tatyana O. Firsova. "Inverse magnetoelectric effect in ferrite-piezoelectric composites." In 2010 IEEE 2nd Russia School and Seminar on Fundamental Problems of Micro/Nanosystems Technologies (MNST). IEEE, 2010. http://dx.doi.org/10.1109/mnst.2010.5687128.

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