Bibliografie tematiche / Manganese

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Letteratura scientifica selezionata sul tema "Manganese"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 16 novembre 2024

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Articoli di riviste sul tema "Manganese"

1

Idrus, Arifudin, E. M. Ati, A. Harijoko e F. M. Meyer. "Characteristics and Origin of Sedimentary-Related Manganese Layers in Timor Island, Indonesia". Indonesian Journal on Geoscience 8, n. 4 (28 dicembre 2013): 191–203. http://dx.doi.org/10.17014/ijog.8.4.191-203.

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Abstract (sommario):
DOI: 10.17014/ijog.v8i4.169Sedimentary-related manganese layers have been discovered in South Central Timor Regency, Timor Island, Indonesia, which is tectonically active and being uplifted due to north-trending tectonic collision between Timor Island arc and Australian continental crust. The manganese layers of 2 to 10 cm-wide interbed with deep sea sedimentary rocks including reddish - reddish brown claystone, radiolarian chert, slate, marl as well as white and pinkish calcilutite of Nakfunu Formations. Stratigraphically, the rock formations are underlain by Bobonaro Formation. Two types of manganese ores found comprise manganese layers and manganese nodule. The manganese layers strongly deformed, lenticular, and segmented, are composed of manganite [MnO(OH)], groutite [MnO(OH)], pyrolusite (MnO2), lithioporite (Al,Li) MnO2(OH)2, and hollandite [Ba (Mn4+, Mn2+)8O16] associated with gangue minerals including calcite, quartz, limonite [FeO(OH)], hematite (Fe2O3), and barite (BaSO4). Whilst the nodule type is only composed of manganite and less limonite. Geochemically, the manganese layers have grade of 63 - 72 wt.% MnO, whereas the nodule one has grade of 63 - 69 wt.% MnO. Generally, iron in Mn ore is very low ranging from 0.2 to 1.54 wt.% Fe2O3, averaged 0.76 wt.%. Hence, Fe/Mn ratio which is very low (0.003 - 0.069), typically indicates a sedimentary origin, which is also supported by petrologic and petrographic data showing layering structure of manganite and lithioporite crystal/grain. Trace element geochemistry indicates that manganese ore was precipitated in a reduction condition. Rare earth element (REE) analysis of manganese ore shows an enrichment of cerium (Ce) suggesting that the ore is basically originated in a marine environment. The manganese nodule is interpreted to be formed by chemical concretion process of unsoluble metals (i.e. mangan, iron) in seawater (hydrogenous) and precipitated on deep sea bottom. On the other hand, the manganese layer is a detrital diagenetic deposit formed by Mn remobilization in seawater column, precipitated and sedimented on the deep sea bottom. Manganese layers have probably been influenced by ‘hydrothermal process’ of mud-volcano activities, proven by the presence of quartz and barite veinlets cutting the Mn layers, manganite recrystallization to be pyrolusite along veinlets cutting manganite and lithioporite layers, and the presence of pyrite and sulphur associated with Mn layers. Field data also exhibit that the significant manganese layers are mostly found around mud volcanoes. The closely spatial and genetic relationships between manganese layers and mud-volcanoes might also be an important guide for the exploration of Mn deposit in the region.
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2

Islamadina, B., e I. W. Warmada. "Mineralogy and geochemistry of Kliripan manganese ore deposit, Hargorejo Village, Kokap District, Kulonprogo Regency". IOP Conference Series: Earth and Environmental Science 1071, n. 1 (1 agosto 2022): 012026. http://dx.doi.org/10.1088/1755-1315/1071/1/012026.

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Abstract (sommario):
Abstract This study discusses the mineralogy and geochemistry of manganese deposits in the Kliripan area, where manganese had been mined since the Dutch occupancy until the 1970s. Although mining has been discontinued since then, the demand for manganese has increased in various industries, prompting exploration to continue to meet this demand. We performed petrographic, XRD, and XRF analysis of the ore and wall rock samples. Jasper and grainstone from the Sentolo Formation are the two lithologies where manganese mineralization occurs. Manganese-bearing minerals include pyrolusite, manganite, rhodochrosite, and lithiophorite, while the gangue minerals consist of quartz, calcite, hematite, and clay minerals. We interpret that Jasper is a product of alteration and has MnO content as high as 5.02 wt.%. Meanwhile, the economic grade manganese ore in grainstone has an MnO content up to 48.51 wt.%. The elements Ce, Zr, Co+Ni+Cu, are important discriminants to determine the type of manganese deposit. The results showed that the diagenetic process in reductive water formed the manganese ores. Oxidation of divalent manganese ion formed pyrolusite and manganite. Rhodochrosite crystallized when dilute manganese solution reacts with CO2 from limestone diagenesis. We concluded that the Kliripan manganese ore deposit has both hydrothermal and diagenetic deposits.
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3

Rybenko, I. A., I. D. Rozhikhina, O. I. Nokhrina e M. A. Golodova. "Rational application of high quality manganese concentrate". Izvestiya. Ferrous Metallurgy 67, n. 2 (21 aprile 2024): 237–44. http://dx.doi.org/10.17073/0368-0797-2024-2-237-244.

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Abstract (sommario):
The article presents the results of theoretical and experimental studies of manganese reduction processes from oxides of high-quality manganese concentrate obtained by hydrometallurgical enrichment of ferromanganese ores, as well as, from marokite (product of thermal synthesis of concentrate and dolomite) with carbon and silicon. The method of thermodynamic modeling with TERRA software complex determined the optimal temperatures and costs of reducing agents that ensure the complete reduction of manganese. It was found that any of the above-mentioned reducing agents, or a combination thereof in certain ratios, can be utilized as a reducing agent when using oxide manganese-containing materials for steel treatment. The results of experimental studies made it possible to develop technology for the production of marokite-manganite concentrate and monophase synthetic material (CaMnO3 ). They can be obtained using the technology developed by the authors, which includes mechanical and thermal treatment of a mixture of high-quality manganese concentrate and calcined dolomite or lime. Marokite-manganite concentrate is useful for alloying steel with manganese when it is smelted in an electric furnace or in a ladle furnace unit, and a monophasic synthetic material is efficient for the production of metal manganese. Based on the results of thermodynamic calculations and experimental studies, technological parameters for processing steel with marokite-manganite concentrate in an electric furnace and a ladle furnace unit are proposed. Monophasic synthetic material CaMnO3 should be used as the charge component for the production of metal manganese by the out-of-furnace aluminum thermal treatment, which will increase the terminality of the process, as well as the extraction of manganese at the level of 90 %. The results of experimental studies were obtained using modern research methods with laboratory and analytical equipment, as well as statistical processing methods.
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4

Winslow, James W. W., Kirsten H. Limesand e Ningning Zhao. "The Functions of ZIP8, ZIP14, and ZnT10 in the Regulation of Systemic Manganese Homeostasis". International Journal of Molecular Sciences 21, n. 9 (7 maggio 2020): 3304. http://dx.doi.org/10.3390/ijms21093304.

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Abstract (sommario):
As an essential nutrient, manganese is required for the regulation of numerous cellular processes, including cell growth, neuronal health, immune cell function, and antioxidant defense. However, excess manganese in the body is toxic and produces symptoms of neurological and behavioral defects, clinically known as manganism. Therefore, manganese balance needs to be tightly controlled. In the past eight years, mutations of genes encoding metal transporters ZIP8 (SLC39A8), ZIP14 (SLC39A14), and ZnT10 (SLC30A10) have been identified to cause dysregulated manganese homeostasis in humans, highlighting the critical roles of these genes in manganese metabolism. This review focuses on the most recent advances in the understanding of physiological functions of these three identified manganese transporters and summarizes the molecular mechanisms underlying how the loss of functions in these genes leads to impaired manganese homeostasis and human diseases.
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5

Fafure, A. A., A. O. Adekeye, L. A. Enye, A. A. Tijani, M. M. Ajao e E. E. Edem. "Ficus exasperata vahl improves manganese-induced neurotoxicity and motor dysfunction in mice". Anatomy Journal of Africa 7, n. 2 (4 luglio 2018): 1206–19. http://dx.doi.org/10.4314/aja.v7i2.174140.

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Abstract (sommario):
Manganese is an important element in the biological system, however, excessive exposure may lead to a neurological disorder known as manganism. The present study sought to investigate the ameliorative effects of Ficus exasperata Vahl (E.Vahl) on motor function and neuronal integrity of the Substantia nigra (SNc) and Corpus striatum (CPu) after acute exposure to manganese. Fifty adult male Balb/c mice weighing between 25 – 35g were divided into 5 groups – Group A (normal saline), Group B (Manganese), Group C (E.Vahl), Group D (Post-treatment), Group E (concurrent treatment). Manganese was intraperitoneally administered at 40mg/kg b.w, while E.Vahl orally at 200 mg/kg b.w. Motor coordination was assessed in the animals using Rotarod and Parallel Bar tests. Animals were later sacrificed; brain tissue extracted and processed for histology/immunohistochemistry. Manganese-exposed group showed decreased motor activity on the Rotarod test. Decreased motor activity shown by the increase in latency of turn (LoF) was recorded in the Parallel Bar test. Manganese induced activation of microglia and astrocytic cells in the SNc and CPu, which plays an important role in neurodegeneration as observed in the reduction of TH cells. Indistinct Nissl granules were also noticed in the manganese-exposed group. Treatment with E.Vahl produced significant motor improvement, as well as ameliorative effect on the histoarchitecture of the SNc and CPu. The present investigation has demonstrated the motor-enhancing and neuro-restorative potential of E.Vahl after manganese exposure in adult mice.Key Word: Neurodegeneration; Manganism; Ficus exasperata; Rotarod; immunohistochemistry.
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6

Raimo, Luis Augusto Di Loreto Di, Alexandra De Paiva Soares, Ricardo Santos Silva Amorim, Diana Medina Espinoza, Wellington De Azambuja Magalhães e Gilmar Nunes Torres. "APLICAÇÃO CONJUNTA DE MICRONUTRIENTE (Mn) E FUNGICIDA EM CULTIVO DE SOJA". Nativa 6, n. 1 (28 febbraio 2018): 09. http://dx.doi.org/10.31413/nativa.v6i1.4664.

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Abstract (sommario):
Objetivou-se com o presente estudo avaliar os efeitos da aplicação de manganês misturado ao fungicida, em plantas de soja. O experimento foi realizado na fazenda Beija-flor, município de Jaciara, estado de Mato Grosso. O delineamento utilizado foi o de blocos casualizados em esquema fatorial com parcela adicional (3x2+1) e quatro repetições. Foram aplicadas três doses de manganês (50, 100 e 150 g ha-1), com duas caldas de aplicação (manganês e manganês + fungicida), quando as plantas encontravam-se em estádio vegetativo e apresentavam 9 trifolíos completamente desenvolvidos (v10). Na parcela adicional (controle) foi aplicado apenas fungicida, também no estádio fenológico v10. As características avaliadas foram altura de plantas, massa de mil grãos, produtividade e teor de manganês foliar. Não ocorreram interações significativas entre os fatores avaliados. A produtividade não foi alterada pelas misturas realizadas, porém, apresentou diferenças significativas em função das doses de manganês, sendo a melhor dose equivalente a 100 g ha-1. A parcela adicional diferiu estatisticamente dos tratamentos que receberam as doses de 50 e 150 g ha-1 (sem fungicida) para a variável massa de mil grãos, e do tratamento que recebeu a dose de 100 g ha-1 de manganês misturado ao fungicida, para a produtividade de grãos. Conclui-se que a aplicação de manganês em mistura com fungicida não influenciou nas características agronômicas das plantas de soja avaliadas, apresentando-se como uma alternativa para diminuição de custos operacionais de aplicação em cultivos comerciais.Palavra-chave: Glycine max (L.) Merrill, antagonismo, produtividade, sinergismo. COMBINING MICRONUTRIENT (MN) AND FUNGICIDE APPLICATIONS IN SOY BEAN PRODUCTIVE SYSTEMS ABSTRACT: The objective of this study was to evaluate the effects of the application of manganese together with fungicide in soybean plants. The experiment was carried on Beija-flor farm, in municipality of Jaciara, Mato Grosso state. The experimental design used was randomized block design in a factorial arrangement with an additional plot (3x2+1) and four replications. Three manganese doses were applied (50, 100 and 150 g ha-1), with two application mixtures (manganese and manganese + fungicide), at vegetative stage, when the plants had 9 leafs (v10). On the aditional plot (control) only fungicide was applied, also phenological stage v10. The plant height, the mass of a thousand grains, the manganese content in the leaf and the yield, were the variables used to evaluate the effect of the applications. There were no significant interactions between the evaluated factors. Productivity was not altered by different mixtures, but there were found significant differences due to manganese doses. The best dose observed was the equivalent to 100 g ha-1 of manganese. The additional plot differed statistically from the treatments that received doses of 50 and 150 g ha-1 (without manganese) for the mass of thousand grains, and the treatment that received the dose of 100 g ha-1 manganese mixed with fungicide for grain yield. According to these results, the application of manganese and fungicides combined, do not influence the agronomic characteristics of soybean plants evaluated, that way is a valid alternative to reduce operating costs in soy bean production systems.Keywords: Glycine max (L.) Merrill, antagonism, productivity, synergism. DOI:
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7

Yang, Xin Sheng, Li Qin Yang, Li Lv e Yong Zhao. "Preparation and Properties of Novel Bonded Perovskite Manganite Oxides". Advanced Materials Research 79-82 (agosto 2009): 1723–26. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.1723.

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Abstract (sommario):
The two-phase perovskite manganese composites have potential application in the field of spintronics, as the observed enhanced low-field magnetoresistance in this kind of composite. To prepare the real manganite-based two-phase composition, the concept of bonded perovskite manganese was put forward recently. In this article we review main research results in these bonded perovskite manganite oxide composites and give some expectation.
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8

Новохацкая, А. А., e Г. Я. Акимов. "Роль избыточного марганца в формировании структуры и транспортных свойств манганита (Nd-=SUB=-0.67-=/SUB=-Sr-=SUB=-0.33-=/SUB=-)-=SUB=-1-x-=/SUB=-Mn-=SUB=-1+x-=/SUB=-О-=SUB=-3-=/SUB=- (x=0; 0.2), спеченного при 1273-1473 K". Физика твердого тела 60, n. 7 (2018): 1378. http://dx.doi.org/10.21883/ftt.2018.07.46127.009.

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Abstract (sommario):
AbstractThe Nd_0.67Sr_0.33MnO_3 manganite is a material promising for application as a cathode for medium-temperature solid oxide fuel elements. A high electrical conductivity of such a cathode is the parameter determining the efficiency of the operation of a fuel element. In this report, the effect of influence of excess manganese on the structure and the conductivity of manganite ceramics with compositions (Nd_0.67Sr_0.33)_1– x Mn_1 + x O_3± Δ ( x = 0, 0.2) sintered at temperatures 1273–1673 K is presented for the first time. The existence of 20% excess manganese in the initial manganite powder after sintering is shown to lead to that the conductivity of the obtained ceramics in the temperature range 823–1073 K is several times higher than the conductivity of the ceramics without excess manganese.
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9

Obeng, Sarfo Kwaku, Martin Kulhánek, Jiří Balík, Jindřich Černý e Ondřej Sedlář. "Manganese: From Soil to Human Health—A Comprehensive Overview of Its Biological and Environmental Significance". Nutrients 16, n. 20 (11 ottobre 2024): 3455. http://dx.doi.org/10.3390/nu16203455.

Testo completo
Abstract (sommario):
Background: Manganese is an essential micronutrient that plays a pivotal role in environmental systems, plant physiology, and human health. This review comprehensively examines the manganese cycle in the environment, its absorption and transport mechanisms in plants, and the implications of manganese exposure to human health. Objectives: The objectives of this review are to (i) analyze the environmental cycling of manganese and its bioavailability, (ii) evaluate the role of manganese in plant metabolism and disease resistance, and (iii) assess the impact of manganese toxicity and deficiency on human health. Conclusion: This review highlights that while manganese is crucial for photosynthesis, enzyme activation, and resistance to plant diseases, both its deficiency and toxicity can have severe consequences. In plants, manganese deficiency can lead to impaired growth and reduced crop yields, while toxicity, particularly in acidic soils, can inhibit photosynthesis and stunt development. In humans, manganese is necessary for various physiological processes, but overexposure, especially in occupational settings, can result in neurodegenerative conditions such as manganism. The conclusion emphasizes the importance of managing manganese levels in agriculture and industry to optimize its benefits while minimizing health risks. A multidisciplinary approach is advocated to enhance agricultural productivity and ensure public health safety.
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10

Abe, Keita, Yuji Chiba e Yuzo Nishida. "Facile Uptake of Manganese(III) by Apo- Transferrin: Possible Origin of Manganism". Zeitschrift für Naturforschung C 63, n. 1-2 (1 febbraio 2008): 154–56. http://dx.doi.org/10.1515/znc-2008-1-228.

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Abstract (sommario):
We have investigated the mechanism of manganese ion uptake by apo-transferrin using a capillary electrophoresis method, and obtained clear evidence that oxidation state +3 and the binuclear unit of a manganese chelate are essential factors for the facile uptake by apotransferrin, similar to that observed for Fe(III) chelates. These results may give valuable information to understand the pathogenesis of manganism and to develop new countermeasures for the neurotoxicity by manganese ions.
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Più fonti

Tesi sul tema "Manganese"

1

EMANE, MBA SEVERIN. "Evolution morphogenique et pedogenetique du plateau manganesifere okouma (haut-ogooue, gabon). Consequences sur l'environnement". Université Louis Pasteur (Strasbourg) (1971-2008), 1997. http://www.theses.fr/1997STR1GE03.

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Abstract (sommario):
Le plateau okouma est situe dans la province du haut-ogooue au gabon, entre 13'10' et 13'15' de longitude est et 1'25' et 1'30' de latitudes sud. Il appartient a une ancienne surface d'aplanissement et renferme des teneurs economiques en manganese. Son etude permet de s'interroger sur les environnements paleoclimatiques depuis l'eocene; de dissocier dans l'evolution morphogenique un faconnement ancien et un plus recent ; de proposer une dynamique de l'evolution actuelle de la morphologie du plateau; de definir les mecanismes mis en jeu au cours de la morphogenese et de la pedogenese et enfin de preciser les consequences sur l'environnement de la morphogenese et de la pedogenese. Les methodes utilisees sont : la granulometrie, la morphoscopie, les limites d'atterberg, les bilans geochimiques. L'evolution du plateau apparait fortement liee aux changements climatiques, a l'erosion des cours d'eau, aux caracteristiques physiques des formations superficielles et a la pedogenese. Ces differents facteurs s'inscrivent dans 5 etapes distincts de l'eocene aux temps presents. Elles sont caracterisees par les alternances de climats a saisons contrastees et de saisons chaudes et humides. Les climats determinent les orientations de la morphogenese fluviatile, de la pedogenese et de l'erosion mecanique. La morphogenese fluviatile est differentielle. Elle depend de la nature geologique des roches, de leur degre de durete et de la consistance des formations superficielle. Les phenomenes pedogenetiques actuelles sont la ferrallitisation (les mineraux neoformes sont la metahalloysite, la kaolinite, la gibbsite, la goethite et l'anatase) et l'appauvrissement en argile. L'erosion mecanique est limitee en surface. Elle affecte plus facilement les formations tendres que les formations dures ou indurees. Les materiaux soustraits sur le plateau okouma, riches en manganese, ont un impact au niveau du sol car il devient acide et riche en mn2+ toxique. Le paysage resultant de la morphogenese et de la pedogenese est constitue par des collines en demi-oranges
The okouma plateau is situated in the haut-ogooue province in gabon, beetween 13'10' and 13'15' of east longitude and 1'25' and 1'30' of south latitude. It is owned at an old planation surface and has economic contents in manganese. Its studie permits to wonder about paleoclimatic environments since the eocene, to separate in the morphogenic evolution an old shaping and another more recent, to porpose a dynamic of the present evolution of the okouma morphology, to define the mechanisms occuring in morphogenesis and pedogenesis and finally to specify environmental consequences of morphogenesis and pedogenesis. The methods used are : granulometry, morphoscopy, atterberg limits and evaluations. The plateau evolution appears strongly linked to climatic changes, river erosion, physics characteristics of superficial deposits and pedogenesis. Those different factors enrol in 5 distinct stages since eocene to present times. They are characterised by contrasted seasons climats alternation and hot and humid seasons. The climats determine the orientations of fluviatile morphogenesis, pedogenesis and mechanical weathering. Fluviatile morphogenesis is differential. It depends on the geological nature of rocks, of their degree of hardness and of superficial deposits consistency. The recent pedogenetical events are ferralitization (neo-formed minerals are metahalloysite, kaolinite, gibbsite, goethite and anatase) and clay impoverishment. Mechanical weathering is limited on the area. It affects more easily soft formations than hard or hardened formations. Deposits substracted from the okouma plateau, rich in manganese, have an impact on the soil because it becomes acid and rich in toxic mn2+. The landscapes resultint of morphogenesis and pedogenesis is constitued by half-orange hills
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2

Annie, Lundberg. "Environmental transformations of Manganese and Manganese oxide nanoparticles". Thesis, KTH, Materialvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-289637.

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Abstract (sommario):
Engineered nanoparticles (NPs) are produced in increased quantities. Due to this increase, itis vital to understand the full lifecycle and fate of these NPs to prevent any possible environmental stress. As a result of their size, NPs may interact differently with their environment compared to bulk materials with the same composition, this both gives NPs their usage as well as risks. The risks often include unwanted interaction with biological systems which may lead to generation of toxicity. This study focused on environmental transformations of manganese and manganese oxide (Mn3O4) NPs. Applications these nanoparticles are often in battery technology and catalysis. A solution intended to mimic  the composition of freshwater was used as the environmental media to study these transformations. Exposure of NPs was performed both with and without added natural organic matter (NOM). Several experiments were preformed such as Atomic absorption spectroscopy (AAS) for dissolution of the NPs, Nanoparticle Tracking Analysis (NTA) for particle size, and Attenuated total reflection Fourier transform infrared spectroscopy (ATR- FTIR) for adsorption studies. The production of reactive oxygen species (ROS) was also investigated, and simulations of metal speciation using Visual MINTEQ were also performed. The results from NTA and AAS (for Mn3O4) were not very reliable due to inconsistencies in the results which were probably caused by problems with preparation. However, for both, the results point towards that the dissolution rates of the particles are slightly slowed down when NOM is added. From ATR-FTIR and the simulations it was confirmed that NOM, carbonate, and sulfur will adsorb onto both particles, possibly in multiple layers. As for increased ROS development, no evidence of such an increase was found. However, the method used does not test for increased hydrogen peroxide development so this would in interesting test as well. Other studies which also would contribute to a more nuanced picture of this system is studies regarding zeta potential and studies which furtherinvestigates the type of adsorption mechanism which occurs at the particles surface.
Industriella nanopartiklar används i allt större utsträckning. Därför är det av stor vikt attundersöka hela livscykeln som dessa produkter går igenom for att säkerhetsställa att de inte utgör någon fara för miljön och ekosystemen som de kan komma att hamna i. Som ett resultat av deras storlek interagerar nanopartiklar annorlunda med sin omgivning om man jämför med bulkmaterial av samma sammansättning, detta nanopartiklar både sina unika fördelar och risker. Riskerna innefattar ofta oönskade interaktioner med biologiska  kretslopp som kan resultera i toxicitet. I den här rapporten läggs fokus på just denna typ av kemiska omvandlingar som nanopartiklar av mangan och manganoxid kan tänkas genomgå i det naturliga kretsloppet. Applikationer man ofta ser dessa partiklar i är batteriteknologi och katalys. De medium som används för att studera omvandlingarna är en lösning som efterliknar ytvatten från en klar sjö. Exponeringar gjordes både med denna lösning så som den är och med tillsatt naturligt organiskt material, NOM.En rad olika experiment gjordes så som analyser med AAS för att undersöka partiklarnas upplösning, NTA för partikelstorlekar och ATR-FTIR som undersökte adsorption på partiklarna. Även en studie med en DCFH metod där ökat ROS aktivitet undersöktes och en rad med SHM simuleringar gjorda i Visual MINTEQ utfördes. Resultaten från NTA och AAS analysen visade sig inte vara särskilt tillförlitliga på grund av tvetydliga resultat som troligen orsakats av problem med provpreparationen. Men resultaten från båda dessa pekar mot att upplösningshastigheten blir något hämmad då man tillsätter naturligt organiskt material, för båda partiklarna. Från ART-FTIR och simuleringarna kunde de säkerhetsställas att adsorption av NOM, karbonat och svavel sker på båda partiklarna, möjligen i fler än ett lager. När det kommer till ROS studien kunde inga bevis på ökad ROS aktivitet hittas med den använda metoden. Dock så kunde inte ökat väteperoxid aktivitet mätas med den metod som användes så detta hade varit av intresse att testa i framtiden. Andra studier som också skulle vara hjälpsamma för att ge en mer nyanserad bild av detta system är en studie om partiklarnas zeta potential och merundersökningar om vilken typ av adsorptions mekanism som sker vid partiklarnas yta.
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3

Novokhatska, A. O., G. Ya Akimov, A. V. Zhebel, O. I. Linnik, V. T. Dovgiy e V. V. Burkhovetskiy. "Forming of Nanoscale Structure in Manganite Ceramics with Superstoichiometric Manganese". Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35335.

Testo completo
Abstract (sommario):
The new method for obtaining of the nanoscale structure by means of superstoichiometric manganese in lanthanum manganite (La0.65Sr0.35)1 – xMn1 + xO3 +_ Δ (x = 0, 0.1, 0.2) ceramics sintered at 1500 °C is developed. The increasing of x content from 0.1 to 0.2 leads to forming internal nanosize multilayer structure of ceramic grains with layer size of 190 and 280 nm, respectively. The correlation between such nanostructure and magnetoresistive properties is revealed. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35335
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4

Sayyari, Zahan Mohammad Hassan. "Manganese efficiency and manganese uptake kinetics of different crop species". Göttingen Cuvillier, 2008. http://d-nb.info/991005724/04.

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Santos, Bruno Adriano Schaustz dos [UNESP]. "Otimização de procedimentos para a determinação de maganês em amplo intervalo de concentração por espectrometria de absorção atômica em chama". Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/97831.

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Este trabalho descreve estratégias instrumentais para a determinação de Mn em amplo intervalo de concentração por espectrometria absorção atômica em chama com fonte contínua e de alta resolução (HR-CS FAAS), por meio do uso de diferentes linhas atômicas (principal, secundária, alternativa ou o ajuste do arranjo instrumental) desde que seus intervalos de concentração se completem, sem a necessidade de amplas diluições da amostra. O método proposto foi aplicado as amostras de água de abastecimento, fertilizante foliar, poli vitamínico e material certificado de ligas metálicas. A exaltidão e precisão foram avaliadas por testes de significância (t de student e t - pareado), adição e recuperação, e materiais de referência do Instituto de Pesquisa Tecnológica do Estado de São Paulo, e os resultados foram concordantes ao nível de 95% de confiança em sua grande maioria. Obteve-se curvas analíticas nos intervalos 0,1-2 mg L-1 (279,482 nm), 2-25 mg L-1 (403,075 nm), 25-500 mg L-1 (209,250 nm ou 403,075 nm com queimador a 90 graus), com coeficiente de correlação linear melhor do que 0,9936 em ambas as técnicas (utilizou a espectrometria de absorção atômica em chama com fonte de linhas - LS FAAS - como técnica comparativa). Os limites de detecção para a HR-CS FAAS foram 1,1x10-3 mg L-1 (279,482 nm), 9,8 x 10-3 mg L-1 (403,075 nm), 1,7 mg L-1 (209,250 nm), 7,3x10-2 mg L-1 (403,075 nm com queimador a 90 graus), e para a LS FAAS foram 1,0x10-2 mg L-1, 0,10 mg L-1, 24,8 mg L-1, 7,0 mg L-1, respectivamente. Em HR-CS FAAS, o RSD% variou 0,9 a 1,3, enquanto para a LS FAAS variou 1,1 a 11,8%. As concentrações encontradas pela HR-CS FAAS foram: < 1,1x10-3 mg L-1 (água de abastecimento)...
This paper describes instrumental strategies for the determination of Mn in a wide range concentration by high-resolution continuum source flame atomic absorption spectrometry technique (HR-CS FAAS) by means of different atomic lines (primary, secondary, alternative or adjusting the instrumental arrangement) provided that their concentration intervals complete one another, without need for large sample dilutions. The proposed method was applied to water, foliar fertilizer, poly vitamin and metal alloys certified materials. Accuracy and precision were evaluated by tests of significance (Student's t test and paired - t test), addition and recovery, and reference materials from the Institute of Technological Research of São Paulo. Analytical curves in the intervals 0.1-2 mg L-1 (279.482 nm), 2-25 mg L-1 (403.075 nm), 25-500 mg L-1 (209.250 nm or 403.075 nm burner 90 degrees) were obtained with linear correlation coefficient better than 0.9936. Line source flame atomic absorption spectrometry (LS FAAS) were used as a comparative technique. The detection limits HR-CS FAAS were 1.1x10-3 mg L-1 (279.482 nm), 9.8 x 10-3 mg L-1 (403.075 nm), 1.7 mg L-1 (209.250 nm), 7.3x10-2 mg L-1 (403.075 nm burner 90 degrees). And by LS FAAS were 1.0x10-2 mg L-1, 0.10 mg L-1, 24.8 mg L-1, 7.0 mg L-1 respectively. In HR-CS FAAS, the RSD ranged from 0.9 to 1.3%, while for LS FAAS from 1.1 to 11.8%. The Mn concentrations found by HR-CS FAAS were < 1.1x10-3 mg L-1 (water supply), 4728 ± 62 mg L-1 (foliar fertilizer), 3.65 ± 2 mg g-1 (poly vitamin), 0.709 ± 0.116 mg L-1 (Alloy 14A), 0.998 ± 0.042 mg L-1 (alloy 25). For LS FAAS, the concentrations wer... (Complete abstract click electronic access below)
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Santos, Bruno Adriano Schaustz dos. "Otimização de procedimentos para a determinação de maganês em amplo intervalo de concentração por espectrometria de absorção atômica em chama /". Araraquara, 2012. http://hdl.handle.net/11449/97831.

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Orientador: José Anchieta Gomes Neto
Coorientador: Adriana Paiva de Oliveira
Banca: Márcia Andreia Mesquita Silva da Veiga
Banca: Gian Paulo Giovanni Freschi
Resumo: Este trabalho descreve estratégias instrumentais para a determinação de Mn em amplo intervalo de concentração por espectrometria absorção atômica em chama com fonte contínua e de alta resolução (HR-CS FAAS), por meio do uso de diferentes linhas atômicas (principal, secundária, alternativa ou o ajuste do arranjo instrumental) desde que seus intervalos de concentração se completem, sem a necessidade de amplas diluições da amostra. O método proposto foi aplicado as amostras de água de abastecimento, fertilizante foliar, poli vitamínico e material certificado de ligas metálicas. A exaltidão e precisão foram avaliadas por testes de significância (t de student e t - pareado), adição e recuperação, e materiais de referência do Instituto de Pesquisa Tecnológica do Estado de São Paulo, e os resultados foram concordantes ao nível de 95% de confiança em sua grande maioria. Obteve-se curvas analíticas nos intervalos 0,1-2 mg L-1 (279,482 nm), 2-25 mg L-1 (403,075 nm), 25-500 mg L-1 (209,250 nm ou 403,075 nm com queimador a 90 graus), com coeficiente de correlação linear melhor do que 0,9936 em ambas as técnicas (utilizou a espectrometria de absorção atômica em chama com fonte de linhas - LS FAAS - como técnica comparativa). Os limites de detecção para a HR-CS FAAS foram 1,1x10-3 mg L-1 (279,482 nm), 9,8 x 10-3 mg L-1 (403,075 nm), 1,7 mg L-1 (209,250 nm), 7,3x10-2 mg L-1 (403,075 nm com queimador a 90 graus), e para a LS FAAS foram 1,0x10-2 mg L-1, 0,10 mg L-1, 24,8 mg L-1, 7,0 mg L-1, respectivamente. Em HR-CS FAAS, o RSD% variou 0,9 a 1,3, enquanto para a LS FAAS variou 1,1 a 11,8%. As concentrações encontradas pela HR-CS FAAS foram: < 1,1x10-3 mg L-1 (água de abastecimento)... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: This paper describes instrumental strategies for the determination of Mn in a wide range concentration by high-resolution continuum source flame atomic absorption spectrometry technique (HR-CS FAAS) by means of different atomic lines (primary, secondary, alternative or adjusting the instrumental arrangement) provided that their concentration intervals complete one another, without need for large sample dilutions. The proposed method was applied to water, foliar fertilizer, poly vitamin and metal alloys certified materials. Accuracy and precision were evaluated by tests of significance (Student's t test and paired - t test), addition and recovery, and reference materials from the Institute of Technological Research of São Paulo. Analytical curves in the intervals 0.1-2 mg L-1 (279.482 nm), 2-25 mg L-1 (403.075 nm), 25-500 mg L-1 (209.250 nm or 403.075 nm burner 90 degrees) were obtained with linear correlation coefficient better than 0.9936. Line source flame atomic absorption spectrometry (LS FAAS) were used as a comparative technique. The detection limits HR-CS FAAS were 1.1x10-3 mg L-1 (279.482 nm), 9.8 x 10-3 mg L-1 (403.075 nm), 1.7 mg L-1 (209.250 nm), 7.3x10-2 mg L-1 (403.075 nm burner 90 degrees). And by LS FAAS were 1.0x10-2 mg L-1, 0.10 mg L-1, 24.8 mg L-1, 7.0 mg L-1 respectively. In HR-CS FAAS, the RSD ranged from 0.9 to 1.3%, while for LS FAAS from 1.1 to 11.8%. The Mn concentrations found by HR-CS FAAS were < 1.1x10-3 mg L-1 (water supply), 4728 ± 62 mg L-1 (foliar fertilizer), 3.65 ± 2 mg g-1 (poly vitamin), 0.709 ± 0.116 mg L-1 (Alloy 14A), 0.998 ± 0.042 mg L-1 (alloy 25). For LS FAAS, the concentrations wer... (Complete abstract click electronic access below)
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AL, ALI NAJLA HUSSEIN. "Relation Between Dietary Manganese Intake and Biological Markers of Manganese Exposure". University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1211985289.

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Wei, Duo. "Iron, manganese and rhenium-catalyzed (de)hydrogenation and hydroelementation reactions". Thesis, Rennes 1, 2019. http://www.theses.fr/2019REN1S105.

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L’objectif de ce travail doctoral a été de développer de nouvelles méthodes éco-compatibles pour réaliser efficacement des réactions de (dé)hydrogénation et d’hydroélémentation catalysées par des catalyseurs bien définis de fer, de manganèse et également de rhénium. La première partie de ce travail porte sur le développement des premiers exemples de réaction de borylation de dérivés styrènes et acétyléniques terminaux avec le pinacolborane via une réaction d’activation de liaison C-H catalysée par des systèmes à base de Fe(PMe3)4 ou de Fe(OTf)2/ DABCO. Dans une seconde partie, des complexes de fer à base de ligands carbènes N-hétérocycliques (NHC) tels que Fe(CO)4(IMes) et [CpFe(CO)2(IMes)][I] ont été efficacement utilisés pour la synthèse d’une grande variété d’amines cycliques (pyrrolidines, pipéridines et azépanes) via une réaction d’amination réductrice catalytique en présence d’hydrosilanes. De façon très intéressante, les catalyseurs commerciaux Mn2(CO)10 et Re2(CO)10 en présence de triéthylsilane, ont permis de réduire sélectivement les esters, acides carboxyliques et amides en acétals, alcools et amines correspondants. En complément de l’hydrosilylation, l’hydrogénation d’aldéhydes, cétones et aldimines a pu être efficacement menée grâce à l’utilisation de nouveaux précatalyseurs bien définis de manganèse à base de ligands bidentes facilement accessibles tels que la pyridinyl-phosphine et la 2-picolylamine. Dans la continuité de notre intérêt pour le développement de nouveaux catalyseurs à base de métaux du groupe 7, une série de complexes de rhénium coordinés à des ligands amino-bisphosphino a montré une excellente aptitude à promouvoir l’hydrogénation de composés carbonylés (aldéhydes, cétones), la mono-méthylation sélective d’amines avec le méthanol comme agent de méthylant durable et la synthèse quinolines substituées. La dernière partie de se travail décrit le développement d’oxydations aérobies d’amines pour préparer des aldimines, des composés N-hétéroaromatiques et des dérivés de type benzoimidazole via une catalyse au manganèse en l’absence de ligands ou d’additifs
This research work is aimed at developing advanced eco-friendly methodologies in the area of iron, manganese and rhenium-catalyzed (de)hydrogenation and hydroelementation reactions. Initially, we reported the first examples of highly selective catalytic direct C-H borylation of styrene derivatives and terminal alkynes with pinacolborane using Fe(PMe3)4 and Fe(OTf)2/DABCO as catalyst systems, respectively. Afterwards, N-heterocyclic carbene (NHC) based iron complexes Fe(CO)4(IMes) and [CpFe(CO)2(IMes)][I] were efficiently employed in the catalytic reductive amination reactions with hydrosilanes to access a large variety of cyclic amines (pyrrolidines, piperidines and azepanes). Interestingly, with the commercially available Mn2(CO)10 or Re2(CO)10 as catalyst and Et3SiH as an inexpensive hydrosilane source, carboxylic esters, acids and amides can be chemospecifically reduced to the corresponding acetals, alcohols and amines. Besides hydrosilylation, we also explored the application of a series of well-defined manganese pre-catalysts featuring readily available bidendate pyridinyl-phosphine and 2-picolylamine ligands in hydrogenation reactions of aldehydes, ketones and aldimines. In line with our interest in developing group 7 metals based catalysts, we have also demonstrated that a series of amino-bisphosphino ligands coordinated rhenium catalysts can efficiently promote the hydrogenation of carbonyl derivatives, the mono N-methylation of anilines with methanol and the dehydrogenative synthesis of substituted quinolines. Lastly we also developed the Mn-catalysed ligand- and additive-free aerobic oxidation of amines to prepare aldimines, N-heteroaromatics and benzoimidazole derivatives
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Reginato, Nada McGlinchey Michael J. "Polycyclic compounds of manganese /". *McMaster only, 2003.

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Turkeli, Altan. "Microsegregation in manganese steels". Thesis, University of Sheffield, 1990. http://etheses.whiterose.ac.uk/15023/.

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Dendritic morphology and microsegregation in the ternary Fe- 1.6% Mn - 0.1 to 0.8 % C alloys have been investigated by quenching the unidirectionally solidified specimens. The microprobe analysis of these specimens showed that the manganese segregation was significantly controlled by the back diffusion. This back diffusion was extremely high in the case of ferritic solidification whereas only a small rise in Cmin was obtained for the austenitic phase. It was found that the manganese microsegregation between the primary arms was always higher than between the secondary arms. The measured segregation ratios indicated a rise with increasing carbon content for both morphologies. No clear effect of cooling rate on segregation was seen for secondary arms and only a sliqht increase was recorded with increasing the cooling rate for primary arms. Secondary dendrite arms solidified to produce asymmecric distribution profiles (saw-tooth or TGZM effect). Measurements of the secondary dendrite arms during qrowth showed that the rate of the coarsening in these manganese steels was higher than other steels resulting in high homogenization between the arms . No tertiary arms have been observed. The primary arms grew mainly in the so-called 'close packed' arrangement and their spacinq did not chanqe with time. By increasing the qrowth rate and the temperature qradient in the liquid a decrease in primary arm spacings was seen. The results agree well with available experimental data in the literature. The microsegregation calculations obtained from the secondary dendrite arm coarseninq model is in a very good agreement with the experimental measurements. The same model without arm coarsening was applied to different primary arm morphologies and the predictions of these models are also in reasonable agreement with observations.
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Libri sul tema "Manganese"

1

Saxton, Robert. Manganese. Manchester: Carcanet, 2003.

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2

Philippines. Lands Geological Survey Division., a cura di. Manganese. Quezon City: Lands Geological Survey Division, Mines and Geosciences Bureau, Dept. of Environment and Natural Resources, 2005.

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3

United States. Agency for Toxic Substances and Disease Registry. Division of Toxicology and Environmental Medicine. Manganese. Atlanta, GA: Dept. of Health and Human Services, Public Health Service, Agency for Toxic Substances and Disease Registry, Division of Toxicology and Environmental Medicine, 2008.

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4

1944-, Levine Richard M., a cura di. The manganese industry of the U.S.S.R. Avondale, Md: U.S. Dept. of the Interior, Bureau of Mines, 1986.

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5

Boucher, L. J., Karl Koeber e Dieter Tille. Mn Manganese. A cura di Helga Demmer, Helga Köttelwesch, Edith Schleitzer-Rust e Dieter Tille. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-662-08178-5.

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Sarbas, Bärbel, e Wolfgang Töpper. Mn Manganese. A cura di Reiner Ditz e Wolfgang Töpper. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-08907-1.

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Cairncross, B. The manganese adventure: The South African manganese fields. Johannesburg: Associated Ore & Metal Corp., 1997.

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L, Pecoraro Vincent, a cura di. Manganese redox enzymes. New York, N.Y: VCH, 1992.

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Lula, R. A. Manganese stainlesss steels. Paris: Manganese Centre, 1986.

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L, Pecoraro Vincent, a cura di. Manganese redox enzymes. New York: VCH, 1992.

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Capitoli di libri sul tema "Manganese"

1

Sarbas, Bärbel, e Wolfgang Töpper. "Natural Occurrence. Minerals". In Mn Manganese, 1–8. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-08907-1_1.

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Sarbas, Bärbel, e Wolfgang Töpper. "Native Element, Solid Solution, Silicide, and Carbide". In Mn Manganese, 9–13. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-08907-1_2.

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Sarbas, Bärbel, e Wolfgang Töpper. "Sulfides and Related Compounds". In Mn Manganese, 14–137. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-08907-1_3.

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Sarbas, Bärbel, e Wolfgang Töpper. "Halogenides and Oxyhalogenides". In Mn Manganese, 138–43. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-08907-1_4.

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Sarbas, Bärbel, e Wolfgang Töpper. "Oxides". In Mn Manganese, 144–75. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-08907-1_5.

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6

Boucher, L. J., Karl Koeber, Dieter Tille, Helga Demmer, Helga Köttelwesch e Edith Schleitzer-Rust. "Coordination Compounds of Manganese". In Mn Manganese, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-662-08178-5_1.

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Boucher, L. J., Karl Koeber, Dieter Tille, Helga Demmer, Helga Köttelwesch e Edith Schleitzer-Rust. "Complexes with Schiff Bases". In Mn Manganese, 3–238. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-662-08178-5_2.

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Boucher, L. J., Karl Koeber, Dieter Tille, Helga Demmer, Helga Köttelwesch e Edith Schleitzer-Rust. "Complexes with Hydrazones or Related Compounds". In Mn Manganese, 239–364. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-662-08178-5_3.

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Boucher, L. J., Karl Koeber, Dieter Tille, Helga Demmer, Helga Köttelwesch e Edith Schleitzer-Rust. "Complexes with Carbazones, Thiocarbazones, and Formazans". In Mn Manganese, 365–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-662-08178-5_4.

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Durand, B., J. M. Paris, E. Kostiner e M. H. Rapposch. "Manganese Diphosphate (Manganese Pyrophosphate)". In Inorganic Syntheses, 121–23. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132500.ch27.

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Atti di convegni sul tema "Manganese"

1

Astuti, Widi, Slamet Sumardi, Fika Rofiek Mufakhir, Muhammad Fakhrudin e Evvy Kartini. "Synthesis of manganese carbonate and manganese oxalate from Indonesian manganese ore as NMC cathode precursor". In INTERNATIONAL CONFERENCE ON MECHANICAL ENGINEERING FOR EMERGING TECHNOLOGIES (ICOMEET 2021). AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0121479.

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Morgan, Charles L. "Manganese nodules, again?" In OCEANS 2011. IEEE, 2011. http://dx.doi.org/10.23919/oceans.2011.6106912.

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Koshurba, Kaitlin, e Jena Johnson. "Hydrothermal braunite synthesized under simulated diagenesis of manganese oxides with reduced manganese: Implications for the ancient manganese cycle". In Goldschmidt2023. France: European Association of Geochemistry, 2023. http://dx.doi.org/10.7185/gold2023.20332.

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Tastanova, Aisha, Yerzhan Kuldeyev, Gulnar Abdykirova, Alla Biryukova e Saniya Temirova. "PROCESSING OF MANGANESE-CONTAINING WASTES TO PRODUCE MANGANESE PELLETS FOR FERROALLOY PRODUCTION". In 23rd SGEM International Multidisciplinary Scientific GeoConference 2023. STEF92 Technology, 2023. http://dx.doi.org/10.5593/sgem2023/4.1/s18.24.

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At various stages of processing manganese ores, significant volumes of finely dispersed manganese-containing raw materials are formed. Development of technological solutions is required for their use in metallurgical processes. The aim of the study was to develop technologies intended to beneficiate manganesecontaining sludge with the fraction of less than 5 mm and to obtain pellets suitable to be melted into ferromanganese on their basis. The developed beneficiation process flow for manganese sludge includes the screening processes into size classes: - 2.5+1.25; - 1.25 +0.071 and -0.071 + 0 mm, beneficiation in jigging machines of - 2.5+1.25; - 1.25 +0.071 mm classes and concentration on the table of -0.071 + 0 mm to get manganese concentrate containing 29.17 % Mn. The combined manganese concentrate was further subjected to dry magnetic separation that increased the Mn content to 35.2 %. Manganese-containing pellets were obtained using a high-speed mixer-granulator manufactured by Eirich. Technological parameters were determined for the pellet production based on the composition consisting of manganese concentrate, small fractions of special coke, ferrous forms of diatomite and lime. It was found that manganese was present in the composition of pellets burned at 1170oC in the form of jacobsite MnFe2O4 and hausmannite Mn3O4. The ferrobustamite (Ca0.79Fe0.21)SiO3 phase was also formed, which contributes to an increase the strength of the products. Compressive strength of the obtained pellets was 33.7 kg/pellet. Melting temperature of annealed pellets was 1200��. The obtained pellets were suitable to melt ferromanganese alloys.
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Tastanova, A., G. Abdykirova, S. Temirova e A. Biryukova. "Processing and production of pellets from poor-grade manganese-containing raw materials". In Challenges of Science. Institute of Metallurgy and Ore Beneficiation, Satbayev University, 2021. http://dx.doi.org/10.31643/2021.05.

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there is a review of current researches in the processing of poor-grade manganese raw materials. The variety of manganese minerals caused by the valent state of metal in compounds is demonstrated. Different processing methods for manganese-containing mineral and technogenic raw materials are considered. The process of extraction of manganese from ferruginous manganese ore using reduction roasting and magnetic separation, beneficiation technology of poor-grade manganese ore to improve the ratio of Mn/Fe; processes of beneficiation and sintering of fine ferruginous manganese ore with low manganese content; production of agglomerate from the concentrate of manganese poor-grade ore to produce ferrosilicon manganese are described. Results of the authors researches intended to obtain concentrate from manganese-containing sludge and to produce hardened pellets suitable for melting into ferromanganese on its basis using a new component of the binder are presented.
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Abdykirova, Gulnar. "RESEARCH ON OBTAINING ELECTROLYTIC MANGANESE DIOXIDE FROM MANGANESE-CONTAINING SLUDGE LEACHING SOLUTIONS". In 16th International Multidisciplinary Scientific GeoConference SGEM2016. Stef92 Technology, 2016. http://dx.doi.org/10.5593/sgem2016/b12/s04.152.

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Lai, Kun-rong, Wei-bo Zhou e Meng-yao Li. "Notice of Retraction: Study on Manganese adsorption by modified Manganese sand in groundwater". In 2011 International Conference on Electric Technology and Civil Engineering (ICETCE). IEEE, 2011. http://dx.doi.org/10.1109/icetce.2011.5775408.

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Xie, Hong-Yan, Hui Lu e Ji-Kun Wang. "KINETICS OF MANGANESE LEACHING DURING PRESSURE ACID LEACHING OF LOW GRADE MANGANESE ORES". In 2015 International Conference on Energy and Mechanical Engineering. WORLD SCIENTIFIC, 2016. http://dx.doi.org/10.1142/9789814749503_0044.

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Kusumaningrum, Retno, Siti Astari Rahmani, Wahyu Bambang Widayatno, Agus Sukarto Wismogroho, Dwi Wahyu Nugroho, Syahrizal Maulana, Nurul Taufiqu Rochman e M. Ikhlasul Amal. "Characterization of Sumbawa manganese ore and recovery of manganese sulfate as leaching products". In PROCEEDINGS OF THE INTERNATIONAL SEMINAR ON METALLURGY AND MATERIALS (ISMM2017): Metallurgy and Advanced Material Technology for Sustainable Development. Author(s), 2018. http://dx.doi.org/10.1063/1.5038324.

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10

ТОЛСТОВ А, В., В. ЛАПИН А e П. СЛЕПЦОВ А. "MANGANESE OF THE TOMTOR ORE FIELD". In ГЕОЛОГИЯ И МИНЕРАЛЬНО-СЫРЬЕВЫЕ РЕСУРСЫ СЕВЕРО-ВОСТОКА РОССИИ 2024, 230–36. Crossref, 2024. http://dx.doi.org/10.53954/9785604990100_230.

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Within the Tomtor ore field, the prospects of detecting significant manganese resources at high concentrations in a hypergenic complex under layers of unique niobium-rare earth ores. The formation deposits of manganese ores are confined to the limonite horizon of the laterite crust of carbonatite weathering. The ore composition is predominantly oxide (pyrolusite-psilomelan-groutite) with signs of widespread carbonation (with siderite, oligonite and rhodochrosite). The estimated resources of manganese oxide only within the limits of only one Northern section exceed 17 million tons. Further prospecting for manganese of this deposit, as well as the Southern and Buranny sections, followed by exploration of the most ore-bearing allocated areas, according to preliminary data, will increase manganese resources within the Tomtor ore field to 100 million tons with MnO contents of about 15-20%.
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Rapporti di organizzazioni sul tema "Manganese"

1

Summerfield, Daisy. Australian Resource Reviews: Manganese Ore 2020. Geoscience Australia, 2021. http://dx.doi.org/10.11636/9781922446541.

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2

Aschner, Michael, e Vanesssa A. Fitsanakis. Manganese Research Health Project (MHRP). Fort Belvoir, VA: Defense Technical Information Center, febbraio 2009. http://dx.doi.org/10.21236/ada497635.

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3

Aschner, Michael. Manganese Research Health Project (MHRP). Fort Belvoir, VA: Defense Technical Information Center, gennaio 2006. http://dx.doi.org/10.21236/ada446400.

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4

Beck, Erin. Aluminum Manganese Molten Salt Plating. Fort Belvoir, VA: Defense Technical Information Center, giugno 2006. http://dx.doi.org/10.21236/ada608404.

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Aschner, Michael. Manganese Health Research Program (MHRP). Fort Belvoir, VA: Defense Technical Information Center, gennaio 2008. http://dx.doi.org/10.21236/ada482927.

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6

Hanson, A. E. H., e J. I. LaFave. Manganese concentrations in Montana's groundwater. Montana Bureau of Mines and Geology, agosto 2022. http://dx.doi.org/10.59691/aauy5468.

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This report describes the overall Mn concentrations in Montana’s principal aquifers. Statistical relationships between Mn and other aquifer variables are also discussed. An excel file with the dataset is provided as an appendix.
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Doner, H., e M. Zavarin. Nickel and manganese interaction with calcite. Office of Scientific and Technical Information (OSTI), agosto 1999. http://dx.doi.org/10.2172/12549.

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Perkins, A. The Products of Manganese (II) Oxidation. Office of Scientific and Technical Information (OSTI), settembre 2004. http://dx.doi.org/10.2172/833106.

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9

Grush, M. M. X-ray spectroscopy of manganese clusters. Office of Scientific and Technical Information (OSTI), giugno 1996. http://dx.doi.org/10.2172/286265.

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Licht, Mark A., e Kent R. Berns. Glyphosate, Manganese, and Zinc Soybean Trial. Ames: Iowa State University, Digital Repository, 2012. http://dx.doi.org/10.31274/farmprogressreports-180814-1890.

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