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Tesis sobre el tema "Chromium research"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 20 de febrero de 2023

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1

Shaddick, Lindsay Raymond, University of Western Sydney, of Science Technology and Environment College, and of Science Food and Horticulture School. "The geochemistry of chromium in the supergene environment : chromium (VI) and related species." THESIS_CSTE_SFH_Shaddick_ L .xml, 2003. http://handle.uws.edu.au:8081/1959.7/474.

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A description of the role of chromium in aqueous solution with respect to its geochemistry and the formation of secondary chromium minerals in the supergene environment is developed. Secondary chromium minerals are relatively rare in Nature and apart from the lead chromate crocoite which is by far the most common and also the most keenly sought after by collectors due its great beauty, little is known of related species. In attempt to redress this situation the initial aim of this study is to present an up-to-date list and description of secondary chromium minerals. It has long been recognised
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2

Shaddick, Lindsay Raymond. "The geochemistry of chromium in the supergene environment : chromium (VI) and related species." Thesis, View thesis, 2003. http://handle.uws.edu.au:8081/1959.7/474.

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A description of the role of chromium in aqueous solution with respect to its geochemistry and the formation of secondary chromium minerals in the supergene environment is developed. Secondary chromium minerals are relatively rare in Nature and apart from the lead chromate crocoite which is by far the most common and also the most keenly sought after by collectors due its great beauty, little is known of related species. In attempt to redress this situation the initial aim of this study is to present an up-to-date list and description of secondary chromium minerals. It has long been recognised
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3

Panaščikaitė, Erika. "Determination of manganese and chromium by electroanalytical stripping methods research." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2012. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120710_120425-12220.

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There was proposed method for the determination of manganese in drinking water by inverse voltammetry using a mercury film electrode. The determination of manganese in drinking water does not need chemical treatment of a sample. Optimal detection conditions: accumulation potential of -1.75 V, accumulation time 5-30 s, anodic dissolution is performed using square wave voltammetry. Manganese accumulation by the detection limit of 30 seconds is about 0.4 mg l-1, and the relative standard deviations of the working range of concentrations do not exceed 0.10. Actual calcium, magnesium and iron ion c
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4

Ganguly, Rituparna. "THROMBOSPONDIN-1 AS A TARGET OF MICRONUTRIENT TRIVALENT CHROMIUM IN DIABETIC VASCULAR COMPLICATION." Kent State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=kent1461323798.

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5

Lipps, Jody Patricia. "RESEARCH INTERNSHIP AT BATTELLE MEMORIAL INSTITUTE DEPARTMENT OF ENVIRONMENTAL RESTORATION." Miami University / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=miami1070400640.

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6

Marin, Cordoba Roberto. "Chromium Carcinogenesis: Characterization of DNA damaging Intermediates by EPR 31P NMR, HPLC, ESI-MS and Magnetic Susceptibility." Ohio University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1261417590.

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7

JACOB, YVAN PIERRE. "A pre-normative research on the isothermal and cyclic oxidation high temperature oxidation behaviour of chromium." Clermont-Ferrand 2, 2001. http://www.theses.fr/2001CLF22279.

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De nombreux parametres experimentaux intervenant lors de l'oxydation du chrome a haute temperature ont ete etudies afin de comprendre leurs effets sur la croissance et l'integrite de la couche de chromine qui se forme lors de cette oxydation. Hormis les techniques classiques utilisees pour l'etude de l'oxydation a haute temperature, nous nous sommes servis de la methode d'activation nucleaires des couches minces (tla) permettant de quantifier les pertes eventuelles d'oxyde par ecaillage lors d'oxydations isothermes ou cycliques. Le but de ce travail, par l'etude systematique de differents para
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8

Dai, Lu. "EFFECTS OF CHROMIUM ON MOUSE SPLENIC T LYMPHOCYTES AND EFFECTS OF ETHANOL EXPOSURE DURING EARLY NEURODEVELOPMENT ON BEHAVIORS IN MICE." UKnowledge, 2017. https://uknowledge.uky.edu/toxicology_etds/18.

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The dissertation consists of three major projects with the focus on the immunotoxicity of chromium and the behavior disorders caused by early ETOH exposure respectively. Hexavalent chromium [Cr(VI)] is widely used in various industrial processes and has been recognized as a carcinogen. As the first line of host defense system, the immune system can be a primary target of Cr(VI). T cell population represents a major arm of the immune system that plays a critical role in host anti-tumor immunity. Dysfunction of T cells compromises host anti-tumor immunity resulting in oncogenesis. Using mouse sp
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9

Rink, Cameron L. "Nutritional Intervention And Modeling Of Acute Ischemic Stroke." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1210957018.

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10

Midander, Klara. "Metal Particles – Hazard or Risk? Elaboration and Implementation of a Research Strategy from a Surface and Corrosion Perspective." Doctoral thesis, Stockholm : Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11695.

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11

Brunner, David R. "The Composition and Distribution of Coal-Ash Deposits Under Reducing and Oxidizing Conditions From a Suite of Eight Coals." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2642.

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Eighteen elements, including: carbon, oxygen, sodium, magnesium, aluminum, silicon, phosphorus, sulfur, chlorine, potassium, calcium, titanium, chromium, manganese, iron, nickel, strontium, and barium were measured using a scanning electron microscope with energy dispersive spectroscopy from deposits. The deposits were collected by burning eight different coals in a 160 kWth, staged, down-fired, swirl-stabilized combustor. Both up-stream and down-stream deposits from an oxidizing region (equivalence ratio 0.86) and reducing region (equivalence ratio 1.15) were collected. Within the deposits, t
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12

Chang, Yu-Kuan, and 張毓寬. "Fundmental research in resources recovery of chromium sludge." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/uxyrmj.

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碩士<br>國立成功大學<br>資源工程學系碩博士班<br>90<br>This study point on the real quantity of electroplating and tannery chromium sludge in Taiwan, and studied on the physical and chemical characteristics, TCLP test, acid leaching, and recycle residue of chromium sludge. Besides, ferrite process was used to transform the chromium sludge into ferrite, in order to stabilized and recycled. The basic property was showed, chromium sludge was about Cr 5~28%, pH was about 6.5~9.5, moisture 50~84%, electroplating sludge mass loss was about 26~28%, tannery sludge contain more organic matter so the mass loss was about
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13

Su, Jing-Yu, and 蘇靖宇. "Research and Fabrication of Chromium Carbide Solar Heat Selective Absorbers." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/12801653122376022896.

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碩士<br>國立高雄第一科技大學<br>光電工程研究所<br>99<br>In this study, Chromium Carbide (CrC) is used as solar heat selective absorbers, and decided that the film structure is SiO2 /CrC deposited on stainless steel substrate and the silicon substrate. Using our own sputter and the closed field unbalanced magnetron sputter, we fabricated the solar selective absorbers. And this thesis uses the UV-VIS-NIR Spectrophotometer to measure the reflectance spectrum of the sample to caculate the photothemal conversion efficiency. By using the recipe of Ar/C2H2=45/15, we fabricated the CrC solar heat selective absorber film
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14

Tsai, Pei-jung, and 蔡珮容. "The Research of Alkylation of Tricarbonyl Chromium Polycyclic Aromatic Compounds." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/78638018559140732766.

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碩士<br>靜宜大學<br>應用化學系<br>84<br>Abstract In the chemistry of these satu- aturated-polycyclic aromatictricar bonyl ch- romiumcomplexes., we find it includes high regio-selectivity, and th ey have an obvious sign of C-H bond activation at proton NMR analysis. Beca use of the electronic density distribution on polycyclic arenes, the reaction mostly occurred on certain parts of the polycyclic ring, and their high electr onic density and strong C-H bond strength will make the substitution reac- tio n, espec
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15

Jiao-YenDeng and 鄧教言. "Characteristic Research for Cobalt Chromium Molybdenum Alloy Powder in Selective Laser Melting." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/tu85r3.

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16

Liu, Tzu-Hao, and 劉子豪. "Research of Preparing Iron-Chromium based SOFC Anode Substrate by Rotating Electrode Processing." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/18119830302966732069.

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碩士<br>國立臺灣大學<br>材料科學與工程學研究所<br>100<br>Conventional anode support of solid oxide fuel cell (SOFC) with Ni-YSZ composite materials has the drawback of high material cost. Recently research works attempt to use stainless steel instead of using Ni-base alloy as anode support materials to reduce the cost of SOFC fuel cells. The stainless steel substrate is highly competitive materials for anode materials due to the properties of good match with solid electrolyte in thermal expansion coefficient as well as better oxidation resistance than Ni-base alloy. 　　However the porous anode substrate with conv
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17

Ivanov, Pavel G. Lind David. "Expitaxial films of chromium dioxide from a new precursor (Cr8O21) and research on their application in spin-electronic devices." 2002. http://etd.lib.fsu.edu/theses/available/etd-06192003-114213/.

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Thesis (Ph. D.)--Florida State University, 2002.<br>Advisor: Dr. David Lind, Florida State University, College of Arts and Sciences, Dept. of Physics. Title and description from dissertation home page (viewed Sept. 29, 2003). Includes bibliographical references.
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18

Li, Sheng Shan, and 盛珊琍. "The Research of Synthetical Mechanism and Chemical Reactions of Tricarbonyl Chromium Polycyclic Aromatic Compound." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/70034276176963973203.

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碩士<br>靜宜大學<br>應用化學系<br>82<br>We have synthesized and exhibited a series of the sub- stituted, saturated-PAHCr(CO)▋.In the process of synthesis, because the PAHCr(CO)▋are difficult to be synthesized and low in yield,it is a great disadvantage in the application of organic synthesis. We have developed a modified synthetic way:the Cr(CO)▋L▋is used instead of Cr(CO)▋,and the solvent system and reaction temperature is changed.By the new synthetic way,we get a product of higher yield on the synth
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19

Penque, Brent A. "Mechanisms of hexosamine-induced cholesterol accumulation and therapeutic actions of chromium." Thesis, 2014. http://hdl.handle.net/1805/3805.

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Indiana University-Purdue University Indianapolis (IUPUI)<br>Excess caloric intake and/or obesity currently remain the largest predisposing risk factors for the development of type 2 diabetes. Discerning the cellular and molecular mechanisms responsible and amendable to therapy represents a growing challenge in medicine. At a cellular level, increased activity of the hexosamine biosynthesis pathway (HBP), a sensor of excess energy status, has been suggested to promote the exacerbation of insulin resistance through increasing adipose tissue and skeletal muscle membrane cholesterol content. This
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20

Rahman, G. M. Mizanur. "Development, research and validation of environmental speciation methods evaluation by speciated isotope dilution mass spectrometry in mercury and chromium speciation analysis /." 2004. http://etd1.library.duq.edu/theses/available/etd-08112004-135836/.

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21

Yen, Chien-Lung, and 嚴建隆. "Research on the Wear-Resistance of High-Chromium White Cast Iron and Multi-component White Cast Iron." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/00719880767916922761.

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博士<br>國立臺灣大學<br>機械工程學研究所<br>101<br>This research studied the difference of wear resistance between high chromium white cast iron and multi-component white cast iron under two optimum conditions (including optimal alloy composition and optimal heat treatment) by using Pin-On-Disk wear test and solid particle erosion test. The composition of cast iron has a close relationship with its phase change of mold status and it directly influences its wear resistance and erosion properties. The test results found that wear resistance of high chromium white cast iron has linear relationship with test
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22

Curr, Thomas Robert. "The dissolution of a Transvaal chromite in liquid silicate slags under an inert atmosphere at 1550 celcius degrees and 1650 celsius degrees." Thesis, 1990. https://hdl.handle.net/10539/24333.

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A dissertation submitted to the faculty of Engineering, University of the Witwatersrand, in fulfillment of the requirements for the degree of Master of Science in Engineering.<br>The role of chromite dissolution in the smelting of ferrochromium was investigated with the object of improving the throughput and chromium recovery of the process. The solubility of a typical Transvaal chromite in silicate slags with cao/si02 ratios from 0,03 to 0,55 at 1550·C and 1650·C was determined. Synthetic slags were melted in porous chromite crucibles and the slag underwent repeated reactions with the
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23

Hoffman, Nolan John. "The Effects of Chromium on Skeletal Muscle Membrane/Cytoskeletal Parameters and Insulin Sensitivity." Thesis, 2012. http://hdl.handle.net/1805/2840.

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Indiana University-Purdue University Indianapolis (IUPUI)<br>A recent review of randomized controlled trials found that trivalent chromium (Cr3+) supplementation significantly improved glycemia among patients with diabetes, consistent with a long-standing appreciation that this micronutrient optimizes carbohydrate metabolism. Nevertheless, a clear limitation in the current evidence is a lack of understanding of Cr3+ action. We tested if increased AMP-activated protein kinase (AMPK) activity, previously observed in Cr3+-treated cells or tissues from Cr3+-supplemented animals, mediates improved
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24

Vest, Brian Michael. "The electronic, structural, and magnetic properties of the chromium dihalides - from the gas-phase to the solid-state : a thesis submitted in partial fulfillment of the requirements of the degree of Doctor of Philosophy in Theoretical Chemistry at Massey University, Albany, New Zealand." 2008. http://hdl.handle.net/10179/744.

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Unrestricted Kohn-Sham (broken symmetry) density functional calculations have been used to determine the low-energy geometries of the chromium dihalide molecules (CrX2) and their clusters, Cr2X4, Cr3X6, and Cr4X8. The monomers are also investigated at a higher level, including coupled-cluster and state-average CASSCF computations. Our calculations show that the monomers have a 5B2 ground state arising from the Renner-Teller distorted 5IIg transition state, leading to a bent geometry. The global minima of the gas-phase clusters of CrF2 and CrCl2 consist of two-dimensional, anti-ferromagneticall
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