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Dissertations / Theses on the topic 'SEM (SEI/EDX)'

Author: Grafiati

Published: 3 June 2025

Last updated: 19 July 2025

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1

Bagdzevičienė, Jurga. "Senovinių pigmentų tapybos kūriniuose ir archeologinio stiklo radiniuose tyrimas ir apibūdinimas." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2012. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120629_152650-40394.

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Septynių unikalių, didelę istorinę ir meninę vertę turinčių objektų – trijų XVII ir XVIII a. paveikslų, Senovės Egipto sarkofago bei trijų archeologinių stiklo karolių iš Kernavės-Kriveikiškių kapinyno – tyrimams sėkmingai pritaikyti OM, FTIR, SEM/EDX, XRD, μXRD ir µRS analizės metodai. Konstatuota, kad taikant kompleksinius tyrimus galima tiksliai ir efektyviai identifikuoti kūrinių medžiagas, charakterizuoti jų sandarą, apibūdinti technologijas. IR spektroskopija sėkmingai panaudota identifikuojant tapybos grunto ir dažų sluoksnių neorganinius tapybos pigmentus ir jų mišinius bei stiklo koro

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Bagdzevičienė, Jurga. "Investigation and Description of Ancient Pigments in Paintings and Archaeological Glass Finds." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2012. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120629_152636-81665.

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In this dissertation, the results of detailed investigation of the seven unique art objects are presented. The presented results show that complex apllying of the instrumental analytical methods of OM, FTIR, SEM/EDX, XRD, μXRD and µRS is accurate and efficient way to identify composition of works of art and archaeological finds of glass, pigments or describe their technology. IR spectroscopy has been successfully applied to determine pigments and some pigment mixtures in painting‘s ground, paint layers, and destruction products in archaeological glass. The SEM/EDX analysis successfully can be

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Canli, Sedat. "Thickness Analysis Of Thin Films By Energy Dispersive X-ray Spectroscopy." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612822/index.pdf.

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EDS is a tool for quantitative and qualitative analysis of the materials. In electron microscopy, the energy of the electrons determines the depth of the region where the X-rays come from. By varying the energy of the electrons, the depth of the region where the X-rays come from can be changed. If a thin film is used as a specimen, different quantitative ratios of the elements for different electron energies can be obtained. Unique thickness of a specific film on a specific substrate gives unique energy-ratio diagram so the thickness of a thin film can be calculated by analyzing the fingerpri

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4

泽, 龙. "絶縁性試料のSEM-EDX分析". 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/174884.

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5

Alshehabi, Abbas. "Grazing X-Ray Analysis." 京都大学 (Kyoto University), 2012. http://hdl.handle.net/2433/157580.

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6

Mania, Juliette Elisabeth. "SEM/EDS-analyser av föremål påträffade i Birka : En jämförande studie." Thesis, Stockholms universitet, Arkeologiska forskningslaboratoriet, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-108667.

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The purpose of this paper was to identify the elements and the alloys that five objects found in Birka consist of and to examine whether there are any significant differences between the presumably imported and domestic objects. The material was analyzed using a scanning electron microscope (SEM) which was equipped with an energy dispersive X-ray spectrometer (EDS) in order to identify the elements that are present and the alloys that the objects are made of. Then the SEM results were compared with the results of previous analyzes that have been performed on finds from Birka in order to invest

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7

Prasad, Harsha. "Impact of Municipal Water Characteristics on Corrosion of Steel and Copper Piping." Digital WPI, 2016. https://digitalcommons.wpi.edu/etd-theses/1177.

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This research evaluated corrosion and scale deposition in steel and copper pipe sections from apartment complexes located in Rhode Island (RI), Massachusetts (MA), and Maryland (MD). Piping samples from these locations had corroded at an accelerated rate and consisted of HVAC piping, and domestic copper pipes. Pipes were analyzed by scanning electron microscopy (SEM) and electron dispersive spectroscopy (EDS) to quantify the elemental composition of the samples. The water chemistry of each system was compared to the elemental data to determine correlations. Particular elements from the EDS ana

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Potgieter-Vermaak, SS, RHM Godoi, Grieken R. Van, JH Potgieter, M. Oujja, and M. Castillejo. "Micro-structural characterization of black crust and laser cleaning of building stones by micro-Raman and SEM techniques." Elsevier, 2005. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000992.

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Research concerning the formation and removal of black crusts on various historical objects is approached from many different angles. The so-called “yellowing effect”, observed after laser treatment for cleaning purposes, has also received a lot of attention. Evidence regarding this phenomenon differs considerably and the actual mechanisms are still speculated on by researchers. In an attempt to elucidate the processes involved in the yellowing effect associated with laser cleaning, a new analytical technique has been used to investigate the black crust, a region of the sample cleaned by laser

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9

Hegrová, Veronika. "Aplikace korelativní AFM/SEM mikroskopie." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-402580.

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This thesis is dealing with application of Correlative Probe and Electron Microscopy. All measurements were carried out by atomic force microscope LiteScope which is designed especially to be combined with electron microscopes. Advantages of Correlative AFM/SEM Microscopy are demonstrated on selected samples from field of nanotechnology and material science. Application of the correlative imaging was proposed and then realized particularly in case of low-dimensional structures and thin films. Further, this thesis deals with the possibility of combining Correlative AFM/SEM Microscopy with other

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10

Bagherian, Ehsaan-Reza. "To enable the processing of new complex high performance alloys by improving the capacity and performance of continuous casting equipment." Thesis, University of Dundee, 2017. https://discovery.dundee.ac.uk/en/studentTheses/180193a3-ef99-4d4f-a56a-78c69d8f35af.

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In a high competitive market, the development of new alloys, new applications, price pressure and increases in product forces quality wire manufacturers to ask for increased mechanical characteristics without losing conductivity. As a particular example, development of new copper alloys such as CuZr, CuSn, CuMg and CuAg have been developed for automotive cables. Continuous extrusion is currently the most prevalent manufacturing technology in terms of chemical composition, mechanical properties and electrical properties, resulting in the production of high quality rods. However, continuous cast

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11

Singh, V., D. Singh, S. Kumar, and A. S. Maan. "Structural and Morphological Study of Nickel Doped Tin Oxide Nanoparticles Synthesized Via Sol-Gel Technique." Thesis, Sumy State University, 2015. http://essuir.sumdu.edu.ua/handle/123456789/42669.

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In the present paper nickel doped tin oxide nanoparticles were synthesized by using simple sol–gel technique. The as-synthesized sample was characterized by means of X-ray powder diffraction (XRD) spectroscopy and Energy-dispersive X-ray spectroscopy (EDX) techniques for its structural analysis. XRD spectrum reveals that all the nanoparticles are highly polycrystalline in nature and five major peaks were clearly observed. Ni-doped SnO2 crystals existed mainly as tetragonal rutile structure. The average particle size of the nanoparticles was calculated by using the Scherrer formula and it was

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12

Griffin, Greggory A. "Ashes to Ashes: Identifying archaeological fuels." Thesis, University of Bradford, 2018. http://hdl.handle.net/10454/17453.

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Understanding fuel use is important in researching ancient communities. This project developed methods to identify archaeological fuel from midden, hearth, and ash samples using comparison to modern analogues. Modern analogue fuels were ashed at 2000C, 4000C, and 9000C then analysed with a suite of methods, the results were then used to inform the development of an approach for the identification of archaeological fuels. These methods were tested using samples from Ness of Brodgar, Knowe of Swandro, and Smerquoy/Muckquoy in Orkney. Magnetic susceptibility, scanning electron microscopy with en

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13

Naher, Sabikun. "An archaeometric study of copper slags fom early Bonze Age I at Arslantape, Eastern Anatolia, Turkey." Master's thesis, Universidade de Évora, 2020. http://hdl.handle.net/10174/28089.

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ABSTRACT: 15 copper slags and 2 crucible fragments from the village of the Early Bronze Age I ( V1B2 period, 3100-2900 BC), at Arslantepe, Eastern Anatolia, Turkey, have been analyzed with energy dispersive X-ray fluorescence spectroscopy (EDXRF), powder X-ray diffraction (XRD) and scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS) to determine the chemical and mineralogical composition and microstructures as well. The compositional analysis confirms the presence of iron, silicon, and aluminum as the significant elements in the copper slags with the modest level of c

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14

Edman, Jönsson Gustav. "Sputtring av Ti-Si-C-Ag beläggningar från sammansatta sputterkällor." Thesis, Thin Film Physics, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-20045.

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<p>Idag används guld som kontaktmaterial på elektriska kontakter för lågströmstillämpningar. Guldhar emellertid låg nötningsbeständighet, är dyrt och miljömässigt påfrestande att utvinna. Ettalternativt kontaktmaterial till guld är nanokomposit Ti-Si-C-Ag belagt medlikströmsmagnetronsputtring. Nanokomposit Ti-Si-C-Ag har hittills belagts med sammansatt Ti-Si-C sputterkälla och separat silverkälla.</p><p>I detta arbete har filmer belagts från tre olika sammansatta Ti-Si-C-Ag-källor med tre olikakolhalter. Filmerna har belagts i två olika beläggningssystem: Ett konventionellt batchladdat ochett

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15

Irizar, Ana Clara Cadena. "Nel blu, dipinto di blu, five centuries of Blue Roman Glass from the Paletine Hill: a multi-analytical approach to provenance and production technology." Master's thesis, Universidade de Évora, 2020. http://hdl.handle.net/10174/29198.

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Based on a multi-analytical approach, this research aimed to characterize and compare the glass-making processes and provenance of the Roman blu glass collection, dated from the 1st century to Late Antiquity, found in the Helagabalus baths in the North East Palatine archaeological site. The samples were analysed by Optical Microscopy and SEM-EDS to identify homogeneity, glass morphological features like bubbles, inclusions and corrosion. EMPA was applied to determine the elemental composition of major and minor elements, whereas LA-ICP-MS allowed us to define trace elements. Major and minor el

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16

CATALANO, MARIA RITA. "Metal organic chemical vapor deposition of multifuctional perovskitic oxides: from giant K to colossal magnetoresistance materials, from ionic conductors to multiferroics." Doctoral thesis, Università degli studi di Catania, 2014. http://hdl.handle.net/20.500.11769/490844.

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Negli ultimi decenni gli ossidi misti aventi una struttura perovskitica del tipo ABO3 (A = metallo alcalino, metallo alcalino-terroso o appartenente alla serie dei lantanidi, B = metallo di transizione) hanno suscitato grande interesse per le loro numerose proprietà chimiche e fisiche che li rendono candidati particolarmente interessanti in svariate applicazioni tecnologiche. Le molteplici proprietà funzionali degli ossidi perovskitici sono strettamente collegate alla loro struttura cristallina ed alla possibilità di poter variare in un ampio range la loro composizione mediante la parziale sos

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17

Johann, Victoria Anne. "Development and Implementation of an Automated SEM-EDX Routine for Characterizing Respirable Coal Mine Dust." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/73367.

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This thesis describes the development and use of a computer-automated microscopy routine for characterization of respirable dust particles from coal mines. Respirable dust in underground coal mining environments has long been known to pose an occupational health hazard for miners. Typically following years of exposure, coal workers' pneumoconiosis (CWP) and silicosis are the most common disease diagnoses. Although dramatic reductions in CWP and silicosis cases were achieved across the US between about 1970-1999 through a combination of regulatory dust exposure limits, improved ventilation and

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18

Serege, Matthieu. "Développement d'une nouvelle technique d'analyse pour les nanosctructures gravées par plasmas : (S)TEM EDX quasi in-situ." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAT097/document.

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Avec la diminution perpétuelle des dimensions des circuits intégrés, la gravure de dispositifs à l’échelle nanométrique constitue un véritable défi pour les procédés plasma qui montrent des limites dans le cas d’empilement de couches minces notamment. L’anisotropie de gravure réside sur la formation de couches de passivations sur les flancs des motifs, qui agissent comme film protecteur bloquant la gravure latérale par les radicaux du plasma. Cependant, cette fine couche est responsable de l’apparition de pente dans les profils gravés et il est difficile de contrôler son épaisseur. De plus, un

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19

Diktas, Emine Guncem. "A multi-analytical protocol combining EDXRF, SEM+EDS, μXRD and Monte Carlo simulations applied to analyse non-destructively portuguese corroded copper coins". Master's thesis, Universidade de Évora, 2018. http://hdl.handle.net/10174/24464.

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Performing quantitative analyses on archaeological and cultural heritage metallic artefacts is challenging due to their complex multi-layered internal structure. “Layers” may include a) Original metal and/or alloy substrate (gold, silver, bronze etc.) b) Surface patinas enriched in corrosion products sulphides, oxides and/or chlorides compounds c) Protective treatments applied in past conservation interventions d) Soil derived incrustations from archaeological burial environment. To obtain compositional data on the metal substrate, usually these layers have to be removed but this not always po

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20

Tuttle, Richard W. "ELECTROSPUN ALUMINA FIBERS:SYNTHESIS AND CHARACTERIZATION." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1164040902.

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21

Sellaro, Rachel Mary. "Development and Demonstration of a Standard Methodology for Respirable Coal Mine Dust Characterization Using SEM-EDX." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/49434.

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The purpose of this thesis is to examine the potential for a more comprehensive method of analysis of coal mine dust. Respirable dust is specifically of interest due to its ability to cause occupational lung disease when miners are overexposed to airborne concentrations. A detailed standard methodology to characterize respirable mine dust is carefully investigated with the use of scanning electron microscopy with energy dispersive x-ray (SEM-EDX). In addition to a thorough description of the developed particle level characterization approach, the method is demonstrated with underground respira

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Agioutanti, Eleftheria. "An Improved Thermogravimetric Analysis Method for Respirable Coal Mine Dust and Comparison to Results by SEM-EDX." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/91984.

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It has long been known that chronic exposures to high concentrations of respirable coal mine dust can lead to the development of lung diseases such as Coal Worker's Pneumoconiosis, commonly referred to as "black lung", and silicosis. Since the mid-1990s, an alarming resurgence of diseases has been documented in central Appalachia, where underground mining often necessitates significant extraction of rock strata along with the thin seams of coal. These circumstances have prompted concern over if or how changing dust composition might be a factor in contemporary disease prevalence. Until now, t

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23

Martínez, Lazaro Isabel Desamparados. "Estudios integrados de procesos analíticos y conservativos de bronce arqueológico. Aplicación a un casco montefortino y otros materiales afines." Doctoral thesis, Universitat Politècnica de València, 2016. http://hdl.handle.net/10251/61456.

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[EN] An integrated methodology incorporating preliminary archaeometric studies, design and performance of conservative and preventive treatments, as well as the design of an expositive support for a Montefortino helmet conserved at the Museum of Requena (Valencia, Spain), is presented. It was a bronze helmet dated back at the 3rd century B.C., providing from a terrestrial archaeological context showing intense degradation caused by cyclic corrosion associated to cuprous chlorides known as "bronze disease". The object showed advanced intergranular corrosion with deep attack of nantokite and min

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Patriksdotter, Amanda. "Vikingatida förgyllningstekniker : En studie av förgyllningstekniker tillämpade på föremål från Birka med SEM-EDS." Thesis, Stockholms universitet, Arkeologiska forskningslaboratoriet, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-174819.

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Studies with primary focus on Viking age gilding techniques in Scandinavia has not been carried out since the sixties. During the past 50 years knowledge about prehistoric gilding techniques and traces of them in the archeological material, as well as the usage of natural sciences within archaeology, has developed considerably. The aim of this thesis was to revisit the topic of gilding and shed new light on Viking age metalworking in Scandinavia with focus on gilding techniques. The second aim was to determine the possibilities and limitations of the study of gilding with a non-destructive met

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Gram, Tove, and Amanda Vickerfält. "Characterization of non-metallic inclusions according to morphology and composition : A comparison of two different steels before and after turning." Thesis, KTH, Materialvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-170024.

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Investigation of non metallic inclusions in two different steels from Sandvik was made before and after turning. After dissolving the non-metallic inclusions by electrolytic extraction the particles were analysed manually or by INCA feature. This was referred to as 3D analysis. INCA feature analysis without extraction of particles was also performed, this was referred to as 2D analysis. The aim of the report was to a make a characterization of non-metallic inclusions with respect to chemical composition, aspect ratio, size and shape. The aim was also to compare different investigation methods.

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Linnros, Henrik. "Mineraliseringar utmed REE-linjen i sydvästra Bergslagen." Thesis, Uppsala universitet, Berggrundsgeologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-227348.

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This paper briefly summarizes Bergslagen as a bedrock province in order to give background to the genesis and presence of REE-bearing minerals (short for Rare Earth Elements) in the region. These mineralizations mainly occur along the REE-line, a line aproximately a hundred kilometers in length between Norberg in the north and Nora in the south with a width of a few kilometers. Situated in the southwest of Bergslagen it is currently one of only a few places in Sweden where REE-bearing iron oxide mineralizations are potentially economically viable for mining. Ore microscopy has been conducted i

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McIntee, Erin. "FORENSIC ANALYSIS OF AUTOMOBILE PAINTS BY ATOMIC AND MOLECULAR SPECTROSCOPIC METHODS AND STATISTICAL DATA ANALYSES." Master's thesis, University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3131.

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The analysis of 110 automotive paint samples was conducted for the research presented here. Laser-induced breakdown spectroscopy (LIBS) was the central instrument utilized for analysis although scanning electron microscopy / energy dispersive x-ray spectroscopy (SEM/EDS) and Fourier transform infrared spectroscopy  attenuated total reflection (FTIR-ATR) analyses were also performed. Two separate methods of LIBS analysis of samples were used: a cross sectional analysis and a drill down analysis. SEM/EDS analysis focused on the cross section while FTIR-ATR analysis concentrated on the clea

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Lagrosen, Emelie. "Magma-Carbonate Interaction and CO2 Release: A Case Study from Carlingford Igneous Centre, Ireland." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-401982.

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Magma which intrudes into carbonate rich crust, interacts with the carbonate in several ways, for example by contact metamorphism and formation of marble or by metasomatism resulting in calc-silicate skarn. These processes release volatiles, such as CO2, from the carbonate and might thus cause climate change. One volcanic complex where the intrusions and their surrounding metamorphic aureole are well exposed and therefore convenient for investigation of magma-carbonate interaction is the Carlingford Igneous Centre in NE of Ireland. The complex is dominated by a gabbro lopolith and a micrograni

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Redigolo, Marcelo Miyada. "Caracterização química multitécnicas de tintas artísticas brasileiras, um estudo de caso." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-30012019-125116/.

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O presente trabalho apresenta a caracterização química de tintas artísticas brasileiras. Diferente de outras matrizes, os materiais de arte fabricados no Brasil não apresentam informações na literatura que auxiliem em sua conservação e restauração. Amostras de tintas acrílicas e a óleo, nacionais e importadas, foram analisadas pelas técnicas espectroscópicas Raman e infravermelho por transformada de Fourier (FTIR), pirólise acoplada a cromatografia a gás e espectrometria de massas (Py-GC/MS) e microscopia eletrônica de varredura acoplada a espectrometria de fluorescência de raios X (SEM-EDS).

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Twier, Abdulhamied Moktar. "Microstructure/property relationships in three high strength wrought magnesium alloys based on elektron 675." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/microstructure--property-relationships-in-three-high-strength-wrought-magnesium-alloys-based-on-elektron-675(e7f4a6ba-dd07-4845-b2b7-2b2857665085).html.

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The object of the present investigation has been to relate the mechanical properties of a high strength Mg-Y-Gd alloy to alloy composition, extrusion parameters and microstructure. Three alloys with various Y: Gd ratios, of similar total solute content (at %) to Elektron 675, have been investigated in this study:9122: Mg – 6.5 wt % Y – 7.6 wt % Gd – 0.4 wt % Zr 9123: Mg – 8.2 wt % Y – 4.8 wt % Gd – 0.4 wt % Zr9124: Mg – 2.6 wt % Y – 13.1 wt % Gd – 0.4 wt % ZrThe three alloys were extruded at 425 and 475 °C with extrusion ratio 17: 1 to give two samples from each alloy, group a and b. Alloy 912

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Catalano, Maria Rita. "Metal organic chemical vapor deposition of multifuctional perovskitic oxides: from giant K to colossal magnetoresistance materials, from ionic conductors to multiferroics." Doctoral thesis, Università di Catania, 2014. http://hdl.handle.net/10761/1523.

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In the last years, mixed oxides with perovskite structure ABO3 (A=alkaline metal or alkaline earth or rare-earth metal, B= transition metal) have attracted increasing interest due to their several magnetic and electrical properties, which make them particularly interesting candidates in a variety of technological applications. Many of the physical properties of perovskites depend crucially on crystal structure and on the possibility to vary their composition by the partial substitution of cations occupying the A and/or B sites. In fact such substitutions are responsible for the distorti

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Pettersson, Henrik. "Chemical analysis for mapping of soot reactivity." Thesis, KTH, Skolan för kemivetenskap (CHE), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-153489.

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In order to increase the efficiency of diesel particulate filter regeneration more knowledge about diesel soot and its reactivity is required. This thesis compares soot created during accelerated filter loading by lowered rail pressure, with soot from normal filter loading. Soot properties and their correlations to oxidation reactivity are also examined through thermogravimetric analysis, scanning electron microscopy, energy dispersive x-ray spectroscopy, BET nitrogen sorption, and FTIR spectroscopy. The usefulness of these analysis methods was also evaluated. The soot samples consisted of two

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Estrompa, Raquel Ludovina Menezes. "Cravo de Pascal Taskin (1782): caracterização material da policromia exterior." Master's thesis, Faculdade de Ciências e Tecnologia, 2012. http://hdl.handle.net/10362/6881.

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Dissertação para obtenção do Grau de Mestre em Conservação e Restauro, Especialização em Ciências da Conservação<br>Com o surgimento do piano a par de uma alteração dos gostos musicais da época, após o século XVIII o cravo caiu em desuso. Apenas oito cravos atribuídos a Pascal Taskin (1723-1793)sobreviveram até aos nossos dias, sendo o que pertence ao Museu da Música de Lisboa alvo de grande especulação. Embora este instrumento se encontre catalogado como um grand ravalement de um prestigiado cravo flamengo de Andreas Ruckers, foi apontado como falso Ruckers por Grant O’Brien. Devido à sua his

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Ghaderidosst, Joanna. "Malmmikroskopi, SEM-EDS- undersökning och framställning av polerprov från en sektion av Lovisagruvans sulfidmalm, Bergslagen." Thesis, Uppsala universitet, Mineralogi, petrologi och tektonik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-383525.

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I detta arbete har polerprov framställts för att därefter undersökas med malm- och svepelektronmikroskopi (SEM) med energidispersiv röntgenspektroskopisk analys (EDS). Med dessa metoder har mineralsammansättning, strukturer och texturer identifierats och undersökts. De undersökta proverna kommer från borrkärnor genom malmzonen i Lovisagruvan i Bergslagen, södra Mellansverige. Malmen är en tabulär, silverförande Zn-Pb-sulfidmineralisering. De kombinerade undersökningarna av polerproven visar att de huvudsakligen består av zinkblände, blyglans, kvarts, mikroklin, granat, amfibol och pyrit, vilk

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Filho, Jayr Avellar Costa. "Determinação de integrais primeiras liouvillianas em equações diferenciais ordinárias de segunda ordem." Universidade do Estado do Rio de Janeiro, 2013. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=5877.

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Nesta Tese desenvolvemos várias abordagens "Darbouxianas"para buscar integrais primeiras (elementares e Liouvillianas) de equações diferenciais ordinárias de segunda ordem (2EDOs) racionais. Os algoritmos (semi-algoritmos) que desenvolvemos seguem a linha do trabalho de Prelle e Singer. Basicamente, os métodos que buscam integrais primeiras elementares são uma extensão da técnica desenvolvida por Prelle e Singer para encontrar soluções elementares de equações diferenciais ordinárias de primeira ordem (1EDOs) racionais. O procedimento que lida com 2EDOs racionais que apresentam integrais primei

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Giglio, Cristiana. "Il record marino di eventi eruttivi nei fondali circostanti l'isola di Pantelleria." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14037/.

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Il lavoro svolto in questa tesi guarda il record marino di eventi esplosivi associati all’attività eruttiva di Pantelleria, ubicata nel Canale di Sicilia. Esso si basa sul ritrovamento e l’analisi di 17 livelli di tefra appartenenti a tre carote di sedimento (PAN05, PAN06 e PAN07) prelevate nel 2016 sui fondali ad alcune decine di km dall’isola di Pantelleria (progetto PANTHER, PANTelleria High-Energy Eruptions). Su singoli frammenti di pomici e vetro vulcanico selezionati da tali livelli, sono state effettuate analisi litologiche (al microscopio) e composizionali (SEM-EDX ed EMPA), restituend

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Lini, Matilde. "Microscopia elettronica a scansione: principi, sviluppi ed osservazioni su campioni di nanoparticelle." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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I progressi nella ricerca di nuovi detector più efficaci per la rivelazione del segnale e di sorgenti più efficienti di elettroni rendono la microscopia elettronica a scansione uno degli strumenti più utili e versatili d'indagine microscopica e microanalitica. Attualmente, trova impiego in svariati settori di ricerca, dalla biologia, alla medicina, alla chimica. Per quanto riguarda la fisica, risulta essere uno strumento particolarmente adeguato alla analisi della struttura della materia. Il presente lavoro analizza, da un lato, i principi fisici grazie ai quali funziona il microscopio elettro

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Moraes, Liz Mary Bueno de. "Utilização da técnica de fluorescência de raios X por dispersão em energia (EDXRF) na avaliação do material particulado em suspensão na cidade de Limeira - SP." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/64/64134/tde-15042010-105123/.

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O objetivo principal deste trabalho foi avaliar a composição química do material particulado em suspensão na atmosfera na cidade de Limeira/SP, pela técnica de fluorescência de raios X dispersiva em energia (EDXRF). Um amostrador tipo stacker foi utilizado para coletar particulados fino (partículas com diâmetro aerodinâmico entre 2,5 e 10 \'mü\'m) e grosso (partículas maiores que 10 \'mü\'m), utilizando filtros de policarbmüonato de 47 mm de diâmetro e com diâmetros de poro de 0,4 e 8 \'mü\'m, respectivamente. As amostras foram coletadas em 2006 (de janeiro a dezembro), 2008 (de janeiro a abr

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Bou, Belda Eva. "EVALUACIÓN DE LAS VARIABLES QUE INFLUYEN EN LA APLICACIÓN DE PARTÍCULAS SÓLIDAS DE TAMAÑO REDUCIDO A ESTRUCTURAS TEXTILES LAMINARES." Doctoral thesis, Universitat Politècnica de València, 2014. http://hdl.handle.net/10251/39108.

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La tesis versa sobre aplicación de micro y nanopartículas sólidas sobre productos textiles. El objetivo es funcionalizar las estructuras tratadas, aportando nuevas propiedades. La adhesión o ligado de las partículas se realiza mediante agentes de ligado, los cuales pueden ser de muy variada composición. En esta tesis se abordará el estudio de los ácidos policarboxílicos como agentes de ligado libres de formaldehido. El estudio se centrará en evaluar distintos sistemas de aplicación (impregnación, agotamiento, recubrimiento y pulverizado). Se evalúan variables que intervienen en los procesos

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Pirouznia, Pouyan. "High cycle fatigue properties of stainless martensitic chromium steel springs." Thesis, KTH, Materialteknologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-103201.

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For many materials and components like in high speed trains and airplanes fatigue failures occur in the range of over 107 load cycles which is called the high cycle fatigue range. A modern version of the springs was invented which are applied in a certain application. Ultrasonic fatigue testing (20 kHz machine) was conducted for evaluating the steel of the springs. This research explores the fundamental understanding of high cycle fatigue testing of strip steel and assesses a stainless martensitic chromium steel at the high cycle fatigue range. Finite element modeling was conducted to gain kno

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Zemánek, Nikola. "Studium plazmochemické redukce korozních vrstev na bronzi." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2008. http://www.nusl.cz/ntk/nusl-216410.

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The application of low-pressure low-temperature hydrogen plasma on artificial corrosion layers on bronze has been studied. For this purpose, three sets of bronze corroded samples were prepared. The first step of the model sample preparation was grinding of the bronze surface by using emery with 60, then 280 and finally by 600 grains density, in order to achieve the defined surface roughness. The next step of the work were optical and scanning electron microscopy observations with energy dispersive X-ray micro analysis (SEM-EDX) of the prepared bronze sample for purpose of surface structure cha

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Molén, Mats. "Tephrochronology : Methodology and correlations, Antarctic Peninsula Area." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-61327.

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Abstract Methods for tephrochronology are evaluated, in the following way: Lake sediments <500 years old from three small Antarctic lakes were analysed for identification of tephras. Subsamples were analysed for a) grain size, and identification and concentration of volcanogenic grains, b) identification of tephra horizons, c) element abundance by EPMA WDS/EDS and LA-ICP-MS, and d) possible correlations between lakes and volcanoes. Volcanogenic minerals and shards were found all through the sediment cores in all three lakes, in different abundances. A high background population of volcanoge

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Westberg, Emilie. "Qualitative and Quantitative Analysis of Biodiesel Deposits Formed on a Hot Metal Surface." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-95617.

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This thesis aims to investigate the formation of deposits from thermally degraded biodiesel on a hot metal surface under the influence of sodium or copper contaminations. Biodiesel or Fatty Acid Methyl Esters (FAMEs) is a widely utilized biofuel with the potential to replace fossil fuels, however, issues regarding the thermal and oxidative stability prevent the progress of biodiesel for utilization as vehicle fuel. The thermal degradation of biodiesel causes formation of deposits often occurring in the fuel injectors, which could result in reduced engine efficiency, increased emissions and eng

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Jenei, István Zoltán. "Nanoparticle assisted tribofilm formation and material transfer studied with SEM and TEM." Doctoral thesis, Stockholms universitet, Fysikum, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-114745.

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The discovery and subsequent synthesis of metal containing fullerenes- IFS (Inorganic Fullerene-like Structures) by R. Tenne et al. has generated considerable scientific interest with great potential impact in many industrial application areas such as lubrication. The lubrication mechanism (tribofilm formation) via exfoliation and deposition of the atomic layers from this cage-like IF-particles was revealed and demonstrated first by this research group. The incorporation of the nanoparticles into lubricants (oils, greases) is however not straightforward. When two surfaces are sliding against e

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Pazzagli, Nicola. "Analisi di protesi d'anca espiantate: valutazione ex-post di una procedura clinica di revisione chirurgica parziale." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21175/.

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La modularità nelle protesi d'anca semplifica l'intervento di revisione, soprattutto nei casi di mobilizzazione di uno solo dei componenti protesici (cotile o stelo). Tuttavia gli accoppiamenti modulari che permettono un assemblaggio dei componenti della protesi possono andare incontro ad un danneggiamento che può essere di natura meccanica e/o chimica (mechanically assisted crevice corrosion - MACC). L'utilizzo di testine in ceramica, accoppiate con coni morse in lega di titanio, potrebbe ridurre questo fenomeno. Tuttavia l'uso della ceramica è associato al rischio di fattura, soprattutto con

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Borges, Daliana Gomes. "Aproveitamento de embalagens cartonadas em compósito de polietileno de baixa densidade." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-08012008-110235/.

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A produção de materiais plásticos tem se elevado para 169 milhões de toneladas no mundo, no ano de 2003. Uma parte considerável destes polímeros sintéticos, 36% na Europa são destinados ao setor de embalagens. Estas matérias primas são utilizadas por um período de tempo bastante curto e geram um volume de descartes importante. Mesmo com um desenvolvimento considerável de linhas de gestão dos descartes, seu tratamento e sua eliminação colocam ainda problemas provenientes da dificuldade em reutilizar tais embalagens na forma em que são geradas, seja pelo estado de limpeza em que são descartadas,

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Akrmawi, Mervat Hisham. "A multi-analytical study of ceramics from the Chalcolithic Period and the Early Bronze Age IB from Tell El-Far’ah North – Palestine." Master's thesis, Universidade de Évora, 2021. http://hdl.handle.net/10174/31405.

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ABSTRACT: The focus of this work is the characterization of ceramic fragments unearthed more than 60 years ago from the archaeological site of Tell El Far’ah North (west Bank), dated back to the Chalcolithic period (4500-3200 BC) and the Early Bronze Age I (3100-2900 BC). The ancient ceramics found at Tell El Far’ah North are considered fundamental archaeological material remains in reconstructing the cultural development. Indeed, they can provide insight into socio-economic backgrounds through their material culture and technological knowledge. Mineralogical, petrographic and chemical analyse

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Chakraborty, Pinaki. "Tool Life and Flank Wear Modeling of Physical Vapour Deposited TiAlN/TiN Multilayer Coated Carbide End Mill Inserts when Machining 4340 Steel Under Dry and Semi-Dry Cutting Conditions." Scholarly Repository, 2008. http://scholarlyrepository.miami.edu/oa_dissertations/22.

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This study investigates the tool wear of advanced PVD TiALN/TiN multilayer coated end mill inserts when dry and semi-dry machining 4340 low alloy medium carbon steel. A factorial design of experiment setup consisting of two levels of speed, three levels of feed, two levels of depth of cut, and two levels of cutting conditions (semi-dry and dry) was used for the study. The combination of cutting conditions that gave the best response for different components of cutting force, cutting power, surface roughness and tool life were determined using MANOVA & ANOVA analysis and Tukey comparison of mea

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Debrie, Juliette. "Traçage des conditions environnementales et de l'activité microbienne dans des stromatolites formés en contexte évaporitique : stromatolites actuels de Sardaigne et stromatolites du Messinien (6Ma)." Electronic Thesis or Diss., Sorbonne université, 2022. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2022SORUS454.pdf.

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Les stromatolites sont des structures organo-sédimentaires laminées, formées grâce à l’activité microbienne. Présents depuis plus de 3,5 milliards d’années, ils comptent parmi les plus anciennes traces de vie connues sur Terre et ils fournissent des informations précieuses sur la paléobiodiversité et les paléoenvironnements. De nombreuses études ont permis de développer une connaissance approfondie sur les stromatolites actuels, marins et lacustres, pouvant servir de référence pour l’interprétation des stromatolites anciens. Cependant, peu de travaux concernent des stromatolites d'environnemen

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Er, Mehmet Bilgi. "Mineralogy And Production Technology Of Degirmentepe (malatya) Pottery." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613696/index.pdf.

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A series of pottery samples provided from the survey investigations and excavations from Degirmentepe Mound (Malatya), belonging to Chalcolithic (Ubaid), Early Bronze and Iron Ages, were investigated by petrographic and X-ray diffraction (XRD) analyses to determine their textures, mineralogical compositions and microstructures. The sample microstructures and chemical (semiquantitative) compositions were also studied by scanning electron microscope with energy dispersive X-ray spectrometry (SEM - EDX). The chemical analyses of some samples were further investigated by inductively coupled plasma

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