Relevant bibliographies by topics / Diffusive gradients in thin films / Dissertations / Theses
To see the other types of publications on this topic, follow the link: Diffusive gradients in thin films.

Dissertations / Theses on the topic 'Diffusive gradients in thin films'

Author: Grafiati
Published: 4 June 2021
Last updated: 20 February 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 48 dissertations / theses for your research on the topic 'Diffusive gradients in thin films.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Altier, Infantes Alexandra. "Diffusive Gradients in Thin-films (DGT) beyond perfect-sink conditions." Doctoral thesis, Universitat de Lleida, 2018. http://hdl.handle.net/10803/585874.

Full text
Abstract:
La presencia d'elements metàl•lics en el medi ambient està fortament influenciada per les activitats antropogèniques entre les que emergeix l'ús de nous materials basats en nanopartícules metàl•liques i òxids metàl•lics. L'especiació d'ions metàl•lics juga un paper fonamental en la determinació de la biodisponibilitat, l’ecotoxicitat i en general en la seva circulació en mitjans naturals. Però la disponibilitat d'elements metàl•lics i les propietats tòxiques o nutritives depenen a mès d’un conjunt de processos fisicoquímics de caràcter dinàmic, on les condicions d'equilibri, malgrat el seu amp
APA, Harvard, Vancouver, ISO, and other styles
2

Kobayashi, Takahiro. "Development and application of the DGT technique for the measurement of nitrate, ammonia and phosphate in natural waters, sediments and soils." Thesis, Lancaster University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302435.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Luo, Jun. "Effect of soil dynamics on metal uptake by plants and diffusive gradients in thin-films." Thesis, Lancaster University, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.533063.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Cole, Russell Francis. "Determination of organotin compounds in coastal sediment pore-water by diffusive gradients in thin-films (DGT) technique." Thesis, University of Portsmouth, 2016. https://researchportal.port.ac.uk/portal/en/theses/determination-of-organotin-compounds-in-coastal-sediment-porewater-by-diffusive-gradients-in-thinfilms-dgt-technique(f452f268-d8c7-4ca9-acb3-ffd6fb733f8e).html.

Full text
Abstract:
Organotin compounds still present a high risk to biota in the aquatic environment. Measuring the behaviour of the freely dissolved fractions of these compounds in sediment compartments is challenging, with costly and sensitive analytical techniques required for their measurement. Diffusive gradients in thin-films (DGT) allow for the uptake and pre-concentration of analytes in a binding gel and is used to measure dissolved metals and some organic compounds. The utility of novel silica-bound sorbents (C8, C18, mixed phases) as DGT binding gels for the sequestration of organotins in the marine en
APA, Harvard, Vancouver, ISO, and other styles
5

Lindfors, Sarah. "Metal Fractionation in Snowmelt Runoff : A Comparison between Ultrafiltration and Diffusive Gradients in Thin Films (DGT) techniques." Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-65018.

Full text
Abstract:
Urban runoff is a non-point pollution source deteriorating water quality of natural watersystems. The composition of urban runoff vary depending on land use, seasonal changes anddifferent surfaces that come into contact with the water. Urban runoff often contain metals andAl, Cd, Cr, Cu, Fe, Ni, Pb and Zn are of particular concern for the environment due to theirpotential toxicity. Metals in runoff can be present in different phases, associated with particles,colloids of different sizes or dissolved in the free phase. The different phases vary in size butalso overlap each other. Information ab
APA, Harvard, Vancouver, ISO, and other styles
6

Bennett, William W. "Development of the Diffusive Gradients in Thin Films Technique for the Measurement of Inorganic Arsenic Speciation in Water and the Investigation of Arsenic Sediment Biogeochemistry." Thesis, Griffith University, 2012. http://hdl.handle.net/10072/365634.

Full text
Abstract:
A novel diffusive gradients in thin films (DGT) technique for the measurement of inorganic arsenic speciation in situ was developed and evaluated. In addition, a diffusive equilibration in thin films (DET) technique was optimized for the high-resolution, colorimetric measurement of iron(II) in sediment porewaters. These techniques were then utilized to investigate processes of arsenic mobilization in sediments and the effect of changing redox conditions on the cycling of arsenic in freshwater and marine sediments. A titanium dioxide-based adsorbent, Metsorb™, was evaluated as a DGT adsorbent f
APA, Harvard, Vancouver, ISO, and other styles
7

Li, Weijia, and n/a. "Development of New Binding Phases for Speciation Measurements of Trace Metals with the Diffusive Gradients in Thin Films Technique." Griffith University. School of Environmental and Applied Science, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20040504.150905.

Full text
Abstract:
The recently developed technique of diffusive gradients in thin films (DGT) for speciation measurement of analytes in the environment was further developed through the development of series of new binding phases including poly(acrylamide-co-acrylic acid) copolymer hydrogel (PAM-PAA), poly(acrylamidoglycolic acid-co-acrylamide) (PAAGA-PAM) hydrogel, the Whatman P81 cellulose phosphate ion exchange membrane (P81) and a liquid binding phase of poly(4-styrenesulfonate) (PSS). A new diffusion layer, cellulose dialysis membrane, was also employed for the liquid binding phase DGT. PAM-PAA copolyme
APA, Harvard, Vancouver, ISO, and other styles
8

Li, Weijia. "Development of New Binding Phases for Speciation Measurements of Trace Metals with the Diffusive Gradients in Thin Films Technique." Thesis, Griffith University, 2004. http://hdl.handle.net/10072/367741.

Full text
Abstract:
The recently developed technique of diffusive gradients in thin films (DGT) for speciation measurement of analytes in the environment was further developed through the development of series of new binding phases including poly(acrylamide-co-acrylic acid) copolymer hydrogel (PAM-PAA), poly(acrylamidoglycolic acid-co-acrylamide) (PAAGA-PAM) hydrogel, the Whatman P81 cellulose phosphate ion exchange membrane (P81) and a liquid binding phase of poly(4-styrenesulfonate) (PSS). A new diffusion layer, cellulose dialysis membrane, was also employed for the liquid binding phase DGT. PAM-PAA copolyme
APA, Harvard, Vancouver, ISO, and other styles
9

Köhler, Sandra. "Bestimmung der Bioverfügbarkeit von Kupfer und Zink in Böden mit der Methode DGT (diffusive gradients in thin films)." Zürich : ETH, Eidgenössische Technische Hochschule Zürich, Institut für terrestrische Ökologie, 2002. http://e-collection.ethbib.ethz.ch/show?type=dipl&nr=102.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Kane, David. "Evaluating phosphorus availability in soils receiving organic amendment application using the Diffusive Gradients in Thin-films (DGT) technique." Thesis, Cranfield University, 2013. http://dspace.lib.cranfield.ac.uk/handle/1826/8001.

Full text
Abstract:
Phosphorus is a resource in finite supply. Use of organic amendments in agriculture can be a sustainable alternative to inorganic P, provided it can meet crop requirements. However a lack of consistent knowledge of plant P availability following application of organic amendments, limits its potential. Studies suggest chemical extraction procedures, may not reflect plant available P. The Diffusive Gradients in Thin-films (DGT) technique is based on natural diffusion of P via a hydrogel and sorption to a ferrihydrite binding layer; which should accurately represent soil P (CDGT) in a plant avail
APA, Harvard, Vancouver, ISO, and other styles
11

Huang, Jianyin. "Development and Evaluation of the Diffusive Gradients in Thin Films (DGT) Techniques for the Measurement of Nutrient Concentrations in Natural Waters." Thesis, Griffith University, 2016. http://hdl.handle.net/10072/367045.

Full text
Abstract:
Due to rapid industrialisation, the growing global population, and the impacts of climate change, the availability and quality of water resources around the world has become degraded. Some regions are suffering water shortages despite sufficient water reserves, because surface and ground waters are contaminated to such a degree that they have become inadequate for potable use. Agricultural practices, industrial discharges and human wastewater are responsible for most contamination of water. Nitrogen (ammonium, nitrate and nitrite) and phosphorus (phosphate) are the most common nutrients in fre
APA, Harvard, Vancouver, ISO, and other styles
12

Turner, Geraldine Sarah Clinton. "The application of the passive sampling technique diffusive gradients in thin-films (DGT) to the measurement of uranium in natural waters." Thesis, University of Portsmouth, 2013. https://researchportal.port.ac.uk/portal/en/theses/the-application-of-the-passive-sampling-technique-diffusive-gradients-in-thinfilms-dgt-to-the-measurement-of-uranium-in-natural-waters(107c3ce9-2c00-435f-b241-0b668c36bf9b).html.

Full text
Abstract:
This thesis describes the application of a passive sampler, Diffusive Gradient in Thin Films (DGT), to the measurement of uranium in natural waters. Four resins (Chelex-100, manganese dioxide [MnO2], Diphonix® and MetsorbTM) were trialled with the DGT device. In freshwater environments, the MetsorbTM accumulated uranium in line with the DGT equation for 7 d with an acuracy of 75%; Chelex-100 did not accumulate uranium past 2 d; MnO2 accumulated up to 75% of that predicted by the DGT equation for 4 d; and the Diphonix® accumulated uranium for 7 d with an accuracy of ~100%. None of the resins te
APA, Harvard, Vancouver, ISO, and other styles
13

Österlund, Helene. "Further characterisation and applications of the diffusive gradients in thin films technique : In situ measurements of anions and cations in environmental waters." Doctoral thesis, Luleå tekniska universitet, Geovetenskap och miljöteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17418.

Full text
Abstract:
As both the toxicity and the mobility of trace elements are related to chemical forms present, robust methods for element speciation analysis are of great interest. During the last 15 years, hundreds of scientific articles have been published on the development and applications of the diffusive gradients in thin films (DGT) passive sampling technique. The aim of this thesis was to explore new application areas as well as carry out further characterisation of DGT-adsorbents already on the market. The commercially available DGT containing ferrihydrite adsorbent, currently in use for the determin
APA, Harvard, Vancouver, ISO, and other styles
14

Panther, Jared Graeme. "Diffusive Gradients in Thin Films for Inorganic Arsenic Speciation and Electrothermal Atomic Absorption Spectrometry with a Coupled Microcolumn for Trace Metal Speciation." Thesis, University of Canterbury. Chemistry, 2008. http://hdl.handle.net/10092/3675.

Full text
Abstract:
This thesis is directed towards the development of the diffusive gradients in thin films (DGT) technique for the measurement of total dissolved As, and for As speciation measurements. In addition, a preliminary investigation of a novel laboratory-based method for measuring labile metal species was carried out; this method involved the coupling of a microcolumn of adsorbent with a standard electrothermal atomic absorption spectrometer. An iron-oxide adsorbent was utilized for As measurements by DGT. The diffusion coefficients of inorganic Asv and AsIII> were measured through the polyacrylamide
APA, Harvard, Vancouver, ISO, and other styles
15

Bořek, Tomáš. "Toxické kovy ve vodě a sedimentech vodní nádrže Brno." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2009. http://www.nusl.cz/ntk/nusl-216543.

Full text
Abstract:
Diploma thesis deals with usage of the diffusive gradients in thin films technique (DGT) for the determination of labile metal species in the surface water and sediments of Brno water reservoir. Sediment and water samples were collected on the selected sides of Brno water reservoir on September and October 2008. The DGT technique was used for determination of depth profiles of Fe, Mn, Pb, Cd, Zn, Cu, Ni and Al. The DGT probes with three different thicknesses of diffusive layer were applied into the sediment samples. The obtained results gave the information about release of metals from solid p
APA, Harvard, Vancouver, ISO, and other styles
16

Shiva, Amir Houshang. "Evaluating the Performance of DGT Technique for Selective Measurement of Trace Metals and Assessment of Environmental Health in Coastal Waters." Thesis, Griffith University, 2016. http://hdl.handle.net/10072/367257.

Full text
Abstract:
The diffusive gradients in thin films (DGT) technique as a passive sampler for measurement of trace metals was validated and evaluated. A systematic determination of diffusion coefficients for a wide range of cationic (Al, Cd, Co, Cu, Mn, Ni, Pb, Zn) and oxyanionic (Al, As, Mo, Sb, V, W) metals in open (ODL) and restricted (RDL) diffusive layers used by the DGT technique was performed. The diffusion coefficients were determined at acidic and neutral pH, using two independent methods, diffusion cells and time-series DGT techniques. The calculated values for many oxyanions were the first repor
APA, Harvard, Vancouver, ISO, and other styles
17

Andrade, Carlos Francisco Ferreira de. "Avaliação in situ da especiação de metais no estuário da Lagoa dos Patos utilizando o sistema DGT." reponame:Repositório Institucional da FURG, 2005. http://repositorio.furg.br/handle/1/3525.

Full text
Abstract:
Dissertação(mestrado) - Universidade Federal do Rio Grande, Programa de Pós-Graduação em Oceanografia Física, Química e Geológica, Instituto de Oceanografia, 2005.<br>Submitted by Cristiane Silva (cristiane_gomides@hotmail.com) on 2013-01-28T12:25:06Z No. of bitstreams: 1 2005_Carlos_de_Andrade.pdf: 1453728 bytes, checksum: 61ca4996bcaf13cd39bc0418f7b5608b (MD5)<br>Approved for entry into archive by Bruna Vieira(bruninha_vieira@ibest.com.br) on 2013-06-13T18:51:07Z (GMT) No. of bitstreams: 1 2005_Carlos_de_Andrade.pdf: 1453728 bytes, checksum: 61ca4996bcaf13cd39bc0418f7b5608b (MD5)<br>Made ava
APA, Harvard, Vancouver, ISO, and other styles
18

Fozard, Susan. "Development and applications of the DGT (diffusive gradients in thin-films) technique for the measurement of Mo and W in waters and soils." Thesis, Lancaster University, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.654735.

Full text
Abstract:
Molybdenum and tungsten are present in the environment as the oxyanions molybdate (MoOl-) and tungstate (WOll Measurements of available Mo and W in soils and waters have been stalled by the lack of a suitable technique. Diffusive gradients in thin films (DGT) is an in situ tool that allows the direct measurement of metal ions accumulated over a given time. This work provides the fIrst systematic investigation on the performance of DGT, containing a binding layer comprising of a single Feoxide reagent, for the measurement of Mo and W in soils and waters. The performance characteristics of DGT,
APA, Harvard, Vancouver, ISO, and other styles
19

Chang, Ling-Yun. "Development and application of diffusive gradients in thin-films (DGT) for the measurement of stable and radioactive caesium and strontium in surface waters." Thesis, Lancaster University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264116.

Full text
APA, Harvard, Vancouver, ISO, and other styles
20

Jabbar, Rawaa Abdullatif Abdul. "Using the DGT to investigate the soil chemistry of P and Cd in sandy loam soil after the application of phosphorus fertilizers." Thesis, Griffith University, 2019. http://hdl.handle.net/10072/386826.

Full text
Abstract:
A recently developed DGT with a mixed binding layer of Chelex and Metsorb (TiO2) was successfully deployed in fresh and seawater to simultaneously measure available cations and anions. But, to date, no studies have used similar DGTs in soils. This study used the Metsorb Gel in two types of DGTs the Metsorb Chelex Mixed Binding layer (MBL-DGT) and the Metsorb Chelex Double Binding layer (DBL-DGT) or sandwich DGT to determine the concentration of available P and Cd (CDGT) in soil. Three experiments were conducted to assess the accuracy, sensitivity, and capacity of the new DGTs to measure the av
APA, Harvard, Vancouver, ISO, and other styles
21

Soares, Jose Antonio. "An investigation of early diagenetic processes in marine coastal environments by the diffusive gradient in thin films (DGT) technique." Thesis, University of Southampton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246223.

Full text
APA, Harvard, Vancouver, ISO, and other styles
22

Reichstädter, Marek. "Využití techniky difúzího gradientu v tenkém filmu v analýze potravin a v environmentální analýze." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2020. http://www.nusl.cz/ntk/nusl-433012.

Full text
Abstract:
Tato dizertační práce zkoumá vývoj techniky difúzního gradientu v tenkém filmu (DGT) pro stanovení rtuti (Hg) a dalších stopových kovů a dále rozšířené možnosti použití této techniky. Technika DGT je v této práci vyvinuta pro stanovení Hg a dalších stopových prvků v různých kapalných médiích. Dvě rozdílná sorpční média specifická pro rtuť byla testována pro použití v technice DGT – Purolite S924 a cysteinem modifikovaná aminopropyl silika (CAPS). Purolite S924 je komerčně dostupný chelatační iontoměnič, CAPS byla připravena v laboratorních podmínkách imobilizací cysteinu na 3-aminopropyl funkc
APA, Harvard, Vancouver, ISO, and other styles
23

Colon, i. Bosch Mireia. "Analytical strategies based on inductively coupled plasma sprectroscopy (ICP) and diffusive gradients in thin fims (DGT) techniques for the assessment of environmental pollution indicators." Doctoral thesis, Universitat de Girona, 2011. http://hdl.handle.net/10803/84050.

Full text
Abstract:
In this thesis, simple methods to determine sulfide at low levels (µg L-1) in aqueous samples and sediments by water free hydrogen sulfide vapor generation using a commercially available vapor generation accessory have been developed. The hydrogen sulfide is then introduced in the ICP-QMS, equipped with an octopole collision/reaction cell which is vented with hydrogen and helium gases, or in the ICP-AES where the optical path between the plasma and the monochromator is purged with nitrogen. Moreover some studies have been conducted for the determination of arsenic by ICP-MS in natural waters w
APA, Harvard, Vancouver, ISO, and other styles
24

Turull, López Marta. "Novel developments in the Diffusive Gradient in Thin films (DGT) technique for the determination of bioavailable mercury and other trace metals in aquatic and terrestrial environments." Doctoral thesis, Universitat de Girona, 2019. http://hdl.handle.net/10803/668780.

Full text
Abstract:
This thesis is focused on the use of the Diffusive Gradient in thin film (DGT) technique for the analysis of bioavailable mercury and other trace metals in water and soil. Homemade DGT devices using a selective ion-exchange resin, and a polyacrylamide gel as the diffusive layer using an open resin (>5 nm), have been used to determine the labile Hg in different aquatic systems, concretely in the Ebro river (Spain) and Tully river (Australia). Besides, a new design of DGT using a bis-acrylamide as a restricted layer (<1 nm) has been performed to determine different species of Hg in agricultural
APA, Harvard, Vancouver, ISO, and other styles
25

Szkandera, Roman. "Vývoj techniky difúzního gradientu v tenkém filmu (DGT) pro stanoveni rtuti ve vodných systémech." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2011. http://www.nusl.cz/ntk/nusl-233340.

Full text
Abstract:
The theoretical part of this doctoral thesis deals with determination of mercury and its species in aquatic systems. Special attention is paid to the use in situ sampling technique diffusive gradients in thin films technique (DGT) and its development. Current resin gels used for determination of mercury by DGT technique Duolite GT-73, Chelex-100 and Spheron-Thiol are described. Moreover, new types of resin gels including Iontosorb AV modified by imidazole or 6-mercaptopurine and commercially available titanium dioxide. Preparations of resin gels and their basic tests in model solution accordin
APA, Harvard, Vancouver, ISO, and other styles
26

Gontijo, Erik Sartori Jeunon [UNESP]. "Distribuição, complexação e mobilidade de íons arsênio em águas superficiais do Quadrilátero Ferrífero-MG/Brasil: ênfase nas interações com substâncias húmicas aquáticas." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/150398.

Full text
Abstract:
Submitted by ERIK SARTORI JEUNON GONTIJO null (sartori_jg@hotmail.com) on 2017-04-20T15:59:08Z No. of bitstreams: 1 Erik Sartori Jeunon Gontijo - Tese.pdf: 6303649 bytes, checksum: e2379a13e7e45d2ce94323eddce0a8bc (MD5)<br>Approved for entry into archive by Luiz Galeffi (luizgaleffi@gmail.com) on 2017-04-25T17:47:27Z (GMT) No. of bitstreams: 1 gontijo_esj_dr_soro.pdf: 6303649 bytes, checksum: e2379a13e7e45d2ce94323eddce0a8bc (MD5)<br>Made available in DSpace on 2017-04-25T17:47:27Z (GMT). No. of bitstreams: 1 gontijo_esj_dr_soro.pdf: 6303649 bytes, checksum: e2379a13e7e45d2ce94323eddce0a8b
APA, Harvard, Vancouver, ISO, and other styles
27

Sonmez, Osman. "A field-based assessment tool for phosphorus losses in the runoff in Kansas ; Effects of phosphorus and manganese oxides on soil lead bioavailibility ; Assessment of bioavailability of zinc by diffusive gradients in thin films (DGT) /." Search for this dissertation online, 2004. http://wwwlib.umi.com/cr/ksu/main.

Full text
APA, Harvard, Vancouver, ISO, and other styles
28

Szkandera, Roman. "Testování modifikovaných sorbetů Iontosorb pro užití v technice difúzního gradientu v tenkém filmu (DGT)." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2008. http://www.nusl.cz/ntk/nusl-216360.

Full text
Abstract:
6-mercaptopurine was joined by diazotation and copulation reactions on Iontosorb AV. Presence of thiol groups in modified resin was showed by infrared spectrometry. Amount of thiol groups was determined by iodometric titration. Resin gel was preparated from modified resin and agarose and both of them were tested for mercury determination by DGT technique.
APA, Harvard, Vancouver, ISO, and other styles
29

Finsterlová, Hana. "Studium vlastností sorpčních gelů pro stanovení rtuti technikou DGT." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2009. http://www.nusl.cz/ntk/nusl-216541.

Full text
Abstract:
The aim of this thesis is testing of resin gels used in diffusive gradients in thin films technique (DGT) for determination of mercury in natural waters. The sorbets, chosen for preparation of resing gels were: Duolit GT- 73, Spheron- Thiol, and Chelex 100 and newly modified sorbent Iontosorb AV. At the beginning of work, the preparation procedure of all resing gels was optimized. After optimalization of preparation procedure the resin gels were tested in mercury model solutions. The recovery test and time dependence test were performed. When the basic tests were finished, they were followed b
APA, Harvard, Vancouver, ISO, and other styles
30

Mongin, Sandrine. "Contributions to the study of the availability of metal ions in aquatic systems." Doctoral thesis, Universitat de Lleida, 2012. http://hdl.handle.net/10803/90839.

Full text
Abstract:
La disponibilitat de metalls per part dels organismes no depèn únicament de la concentració total sinó també de l'especiació d'aquestes subtancias. En general, la disponibilitat de les espècies metàl•liques en medis naturals per a organismes està determinada per un conjunt d'esdeveniments encadenats on el equilibri representa només un cas particular de la situació dinàmica general. Espècies poc definides químicament, com ara àcids húmics i fúlvics, actuen com a lligands de metalls i juguen un paper clau en la circulació i la determinació de les propietats ecotoxicològiques de les espècies met
APA, Harvard, Vancouver, ISO, and other styles
31

Trávníčková, Jana. "Nové sorpční gely pro užití v technice difúzních gradientů v tenkých filmech." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2008. http://www.nusl.cz/ntk/nusl-216441.

Full text
Abstract:
Diffusive gradients in thin films technique (DGT) is a simple preconcetration method for in situ determination of labile metal ions in aquatic systems. It eliminates contamination problems associated with the sampling and transport into the laboratory. The DGT technique is based on a simple device that accumulates metal ions on a cation-exchange resin, immobilized in thin layer of hydrogel, after passage through the diffusion layer. The cation-exchanger, usually Chelex 100, is selective for binding free or weakly complexed metal ions in solution. This diploma thesis deals with the characteriza
APA, Harvard, Vancouver, ISO, and other styles
32

Boman, Daniel. "Compositional gradients in sputtered thin CIGS photovoltaic films." Thesis, Uppsala universitet, Fasta tillståndets elektronik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-355462.

Full text
Abstract:
Cu(In,Ga)Se2 (CIGS) is a semiconductor material and the basis of the promising thin-film photovoltaic technology with the same name. The CIGS film has a typical thickness of 1-2 mm, and solar cells based on CIGS technology has recently reached efficiencies of 23.3%. Ultra-thin CIGS solar cells use sub-micrometer thick films that require significantly less material and can be manufactured in a shorter amount oftime than films with typical thicknesses. With decreasing thickness, both electrical and optical losses get more significant and lower the overall performance. Electrical losses can be de
APA, Harvard, Vancouver, ISO, and other styles
33

Almeida, Eduardo de. "Determinação de metais na bacia do rio Piracicaba usando as técnicas de Difusão em Filmes Finos por Gradiente de Concentração (DGT) e Fluorescência de Raios X Dispersiva em Energia (EDXRF) e por Reflexão Total (TXRF)." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/64/64135/tde-27022012-112202/.

Full text
Abstract:
O desenvolvimento e aplicação de métodos analíticos na avaliação das concentrações de metais nas frações dissolvida e lábil na bacia do rio Piracicaba são de relevante importância para o estudo do comportamento químico-ambiental desses metais e para seu monitoramento, devido ao impacto das atividades antropogênicas nessa bacia. A técnica de difusão em filmes finos por gradiente de concentração (DGT, do inglês diffusive gradients in thin-films), é uma promissora ferramenta analítica de amostragem, pois permite pré-concentração, análise temporal, remoção de interferentes, avaliação lábil e amost
APA, Harvard, Vancouver, ISO, and other styles
34

Mojsilovic, Ognjen. "Estimating bioaccessibility, phytoavailability and phytotoxicity of contaminant arsenic in soils at former sheep dip sites." Lincoln University, 2009. http://hdl.handle.net/10182/1142.

Full text
Abstract:
Recognition that the bioavailability of soil As (As) is influenced by its soil dynamics has initiated research into development of more accurate, site-specific soil guideline values, departing from the assumption that the total soil As content is bioavailable. With the aim of deriving predictive models, the relationship between soil properties and As bioavailability (bioaccessibility and phytotoxicity) was examined on a set of naturally contaminated sheep dip soils (n = 30). Sampled soils were extensively characterised, bioaccessibility was estimated through an in vitro procedure, and soil As
APA, Harvard, Vancouver, ISO, and other styles
35

Giri, Dipak. "Single-molecule spectroscopic studies of thin-film chemical gradients." Diss., Kansas State University, 2016. http://hdl.handle.net/2097/35225.

Full text
Abstract:
Doctor of Philosophy<br>Department of Chemistry<br>Daniel A. Higgins<br>This dissertation describes the application of single molecule spectroscopy and tracking to investigations of the nanoscale properties of thin-film chemical gradients and the transport dynamics of molecules dispersed within and upon these gradients. Chemical gradients are surface bound materials that incorporate gradually changing chemical and/or physical properties. A continuous and gradual change in the properties of gradients are expected and often required for their intended applications, which range from directed grow
APA, Harvard, Vancouver, ISO, and other styles
36

Sánchez, Rodríguez Daniel. "Obtaining advanced oxide thin films at low temperatures by chemical methods. Thermal analysis of thin films." Doctoral thesis, Universitat de Girona, 2015. http://hdl.handle.net/10803/328723.

Full text
Abstract:
L'objectiu d'aquest treball és analitzar mètodes químics de baix cost com a ruta per a sintetitzar òxids avançats a baixa temperatura. En particular, hem explorat l'SHS per a la síntesi d'un òxid catalitzador fent servir pólvores de ciano complexes heteronuclears. També hem explorat el transport de calor per a sintetitzar capes via VCS concloent que les capes primes rarament experimentaran una combustió. Per això hem analitzat la condició necessària per que tingui lloc una combustió volumètrica en una mostra sòlida que reacciona sense intercanvi de gasos amb el seu entorn. Per fer-ho, hem amp
APA, Harvard, Vancouver, ISO, and other styles
37

Němec, Tomáš. "Formy vybraných kovů ve vodních systémech." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2008. http://www.nusl.cz/ntk/nusl-216358.

Full text
Abstract:
The diffusive gradient in thin films technique (DGT) was used to measure concentration of labile metal-species (Cu, Ni, Pb) in the waste water from Faculty of Chemistry, Brno University of Technology.
APA, Harvard, Vancouver, ISO, and other styles
38

Paříková, Lucie. "Rtuť v odpadních vodách." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2008. http://www.nusl.cz/ntk/nusl-216362.

Full text
Abstract:
In the time period from November to April of the academic year 2007/2008 presence of mercury and its forms was monitored in the waste waters of Faculty of Chemistry, VUT in Brno. The level of mercury was determined as total mercury with help of the atomic absorption spectrometry method and in available forms by diffusive gradient in thin film technique.
APA, Harvard, Vancouver, ISO, and other styles
39

Hwang, Pey-Hua B. (Pey-Hua Betty) 1982. "The use of soft lithography to reproduce snail-like movement by creating pressure gradients in thin films." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/32806.

Full text
Abstract:
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2004.<br>Includes bibliographical references (p. 18-20).<br>By imitating nature, man finds ways to expand his capacities. To achieve this aim, he often takes natures designs, simplifies them to their most basic principles and then works in a retrograde fashion to add back the complexity originally stripped away to make the first discoveries. This thesis is based on previous work done on modeling snail movement on a macroscopic scale using a motor driven wave propagation machine. This project scaled down the
APA, Harvard, Vancouver, ISO, and other styles
40

Piovano, Paulo. "Evolution and Regularity Results for Epitaxially Strained Thin Films and Material Voids." Research Showcase @ CMU, 2012. http://repository.cmu.edu/dissertations/96.

Full text
Abstract:
In this dissertation we study free boundary problems that model the evolution of interfaces in the presence of elasticity, such as thin film profiles and material void boundaries. These problems are characterized by the competition between the elastic bulk energy and the anisotropic surface energy. First, we consider the evolution equation with curvature regularization that models the motion of a two-dimensional thin film by evaporation-condensation on a rigid substrate. The film is strained due to the mismatch between the crystalline lattices of the two materials and anisotropy is taken into
APA, Harvard, Vancouver, ISO, and other styles
41

Hutter, Naima A., Marin Steenackers, Andreas Reitinger, Oliver A. Williams, Jose A. Garrido, and Rainer Jordan. "Nanostructured polymer brushes and protein density gradients on diamond by carbon templating." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-138812.

Full text
Abstract:
Micro- and nanostructured polymer brushes on diamond can be directly prepared by carbon templating and amplification of the latent structures by photografting of a broad variety of vinyl monomers such as styrenes, acrylates and methacrylates. Even template structures with lateral dimensions as small as 5 nm can be selectively amplified and defined polymer brush gradients of a variety of functional polymers are realizable by this technique. Furthermore, conjugation with a model protein (GFP) results in protein density gradients of high loading and improved chemical stability. The effective func
APA, Harvard, Vancouver, ISO, and other styles
42

Hutter, Naima A., Marin Steenackers, Andreas Reitinger, Oliver A. Williams, Jose A. Garrido, and Rainer Jordan. "Nanostructured polymer brushes and protein density gradients on diamond by carbon templating." Royal Society of Chemistry, 2011. https://tud.qucosa.de/id/qucosa%3A27783.

Full text
Abstract:
Micro- and nanostructured polymer brushes on diamond can be directly prepared by carbon templating and amplification of the latent structures by photografting of a broad variety of vinyl monomers such as styrenes, acrylates and methacrylates. Even template structures with lateral dimensions as small as 5 nm can be selectively amplified and defined polymer brush gradients of a variety of functional polymers are realizable by this technique. Furthermore, conjugation with a model protein (GFP) results in protein density gradients of high loading and improved chemical stability. The effective func
APA, Harvard, Vancouver, ISO, and other styles
43

Acremont, Quentin d'. "Étude des propriétés thermiques de librairies d’alliages ternaires en couches minces et mise en évidence du transport non-diffusif par spectroscopie thermique pompe-sonde femtoseconde." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0665/document.

Full text
Abstract:
Durant ces travaux, nous nous sommes intéressés à l’étude des transferts thermiques aux nano-échelles dans les couches minces par spectroscopie pompe-sonde femtoseconde. Dans un premier temps, nous nous sommes intéressés à la mesure haute-cadence de la conductivité thermique d’alliages de Fe-Si-Ge et Ti-Ni-Sn, dans le but d’optimiser leur processus de fabrication et de créer une base de données des propriétés thermiques de ces matériaux. Afin de pouvoir mesurer une grande quantité d’échantillons en un temps réduit, un système de mesure haute cadence entièrement automatisé a été développé et ut
APA, Harvard, Vancouver, ISO, and other styles
44

Mason, Sean David. "Diffusive gradients in thin films (DGT) as a technique to predict nutrient availability to plants." 2007. http://hdl.handle.net/2440/57973.

Full text
Abstract:
The soils of Australia have extensive macro and micronutrient disorders varying greatly in their capacities to provide the chemical nutrients essential for plant growth. Assessment of nutrient availability in soils is important in order to maximise fertilizer efficiency and crop yields and to minimise environmental pollution associated with over fertilisation. Nutrient availability has proven difficult to assess due to the complexity of trace element soil chemistry and plant uptake mechanisms. The relatively new method, Diffusive Gradients in Thin Films ( DGT ), provides the potential to becom
APA, Harvard, Vancouver, ISO, and other styles
45

Mason, Sean David. "Diffusive gradients in thin films (DGT) as a technique to predict nutrient availability to plants." Thesis, 2007. http://hdl.handle.net/2440/57973.

Full text
Abstract:
The soils of Australia have extensive macro and micronutrient disorders varying greatly in their capacities to provide the chemical nutrients essential for plant growth. Assessment of nutrient availability in soils is important in order to maximise fertilizer efficiency and crop yields and to minimise environmental pollution associated with over fertilisation. Nutrient availability has proven difficult to assess due to the complexity of trace element soil chemistry and plant uptake mechanisms. The relatively new method, Diffusive Gradients in Thin Films ( DGT ), provides the potential to becom
APA, Harvard, Vancouver, ISO, and other styles
46

Zhang, Yulin. "Development of the diffusive gradients in thin films (DGT) technique for plant available potassium measurement in Australian soils." Thesis, 2015. http://hdl.handle.net/2440/104747.

Full text
Abstract:
Potassium (K) is an essential plant macronutrient and the most abundant cation found in plants. Except for nitrogen (N), K is taken up by plants more than any other nutrient from the soil (Havlin et al. 2005). Due to the complexity of the plant K uptake process, which is affected by multiple factors, the traditional soil K testing methods (e.g. CaCl₂ K, Colwell K, NH₄OAc K, etc.) have generally failed to provide an accurate indication of the amount of K fertilizer should be applied before planting. Beyond measurements of bioavailable fractions of trace elements, the relatively new diffusive gr
APA, Harvard, Vancouver, ISO, and other styles
47

Chess, Timothy William. "Laboratory optimization and field demonstration of diffusive gradients in thin films for in-situ mercury measurements of river sediments." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-08-1942.

Full text
Abstract:
Diffusive gradients in thin film (DGT) technique is applied to determine pore water mercury concentrations in river sediments. DGT devices have been a useful indicator of dissolved metals in aqueous systems, although it is not as well developed for measuring mercury. DGT devices were evaluated for three different ion exchange resins for adsorption of mercury. After a series of laboratory experiments, 3-Mercaptopropyl Functionalized Silica Gel (3M) was chosen as an effective resin layer. Laboratory experiments showed that the resin strongly associated with dissolved Hg²⁺. DGT probes were tested
APA, Harvard, Vancouver, ISO, and other styles
48

(5930279), Yuvraj Singh. "CHARACTERIZATION OF INTERFACIAL ENERGY OF THIN FILMS THROUGH CURRENT INDUCED DIFFUSIVE INTERFACIAL VOIDING." Thesis, 2019.

Find full text
Abstract:
<p>Electromigration in thin films is a well known failure mode for scaled microelectronics. While our understanding of electromigration physics has improved immensely in the last few decades, there are still some gaps in literature. In particular, the influence of interfaces on the mass transport rate is not well understood. Through reliability studies conducted on passivated metals films, marked improvement in electromigration lifetimes was observed. Specifically, some choices of materials for passivation appear to perform better than others. Qualitatively this improvement in electromigration
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the bibliographies on the topic 'Diffusive gradients in thin films' for other source types:
Journal articles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography