Academic literature on the topic 'Pressure differential scanning calorimetry'

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Journal articles on the topic "Pressure differential scanning calorimetry"

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Höhne, G. W. H. "High pressure differential scanning calorimetry on polymers." Thermochimica Acta 332, no. 2 (July 1999): 115–23. http://dx.doi.org/10.1016/s0040-6031(99)00066-0.

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Rösgen, Jörg, and Hans-Jürgen Hinz. "Pressure-Modulated Differential Scanning Calorimetry: Theoretical Background." Analytical Chemistry 78, no. 4 (February 2006): 991–96. http://dx.doi.org/10.1021/ac0516436.

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Ledru, J., C. T. Imrie, J. M. Hutchinson, and G. W. H. Höhne. "High pressure differential scanning calorimetry: Aspects of calibration." Thermochimica Acta 446, no. 1-2 (July 2006): 66–72. http://dx.doi.org/10.1016/j.tca.2006.04.018.

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Wortmann, F. J., and H. Deutz. "Characterizing keratins using high-pressure differential scanning calorimetry (HPDSC)." Journal of Applied Polymer Science 48, no. 1 (April 5, 1993): 137–50. http://dx.doi.org/10.1002/app.1993.070480114.

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Masberg, S., C. Ernst, G. M. Schneider, A. Würflinger, and R. Dąbrowski. "Differential Scanning Calorimetry (DSC) under High Pressure on 10-TPEB." Zeitschrift für Naturforschung A 54, no. 5 (May 1, 1999): 287–90. http://dx.doi.org/10.1515/zna-1999-0503.

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Abstract The phase behaviour of a new liquid crystal, belonging to the series l-[4-n-alkyl-biphenyl]-2-[4-isothio-cyanato-phenyl]ethane (nTPEB), n = 10, has been investigated with differential scanning calorimetry at ambient and high pressure. The phase behaviour depends on the thermal treatment. Phase transition temperatures have been determined as a function of pressure up to 300 MPa. No pressure-induced or pressure-limited phases are observed in this pressure range. Enthalpy-and volume-changes accompanying the phase transitions have been calculated using the Clausius-Clapeyron equation.
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Davies, Simon R., Keith C. Hester, Jason W. Lachance, Carolyn A. Koh, and E. Dendy Sloan. "Studies of hydrate nucleation with high pressure differential scanning calorimetry." Chemical Engineering Science 64, no. 2 (January 2009): 370–75. http://dx.doi.org/10.1016/j.ces.2008.10.017.

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Höhne, G. W. H., S. Rastogi, and B. Wunderlich. "High pressure differential scanning calorimetry of poly(4-methyl-pentene-1)." Polymer 41, no. 25 (December 2000): 8869–78. http://dx.doi.org/10.1016/s0032-3861(00)00230-5.

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BONNET, MADELEINE, AHMED OUALI, and JEAN KOPP. "Beef muscle osmotic pressure as assessed by differential scanning calorimetry (DSC)." International Journal of Food Science & Technology 27, no. 4 (July 1, 2007): 399–408. http://dx.doi.org/10.1111/j.1365-2621.1992.tb01205.x.

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Kowalski, Boleslaw, Eliza Gruczynska, and Katarzyna Maciaszek. "Kinetics of rapeseed oil oxidation by pressure differential scanning calorimetry measurements." European Journal of Lipid Science and Technology 102, no. 5 (May 2000): 337–41. http://dx.doi.org/10.1002/(sici)1438-9312(200005)102:5<337::aid-ejlt337>3.0.co;2-3.

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Lv, Jia Yu, Shuiai Wei, Wang Hua Chen, Gu Feng Chen, Li Ping Chen, and Ying Tao Tian. "Thermal Kinetic Analysis of Tert-butyl Peroxybenzoate under Dynamic and Adiabatic Conditions." Advanced Materials Research 550-553 (July 2012): 2782–85. http://dx.doi.org/10.4028/www.scientific.net/amr.550-553.2782.

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This study demonstrates the thermal actions of tert-butyl peroxybenzoate (TBPB) which is widely used in the plastic and rubber industries. The thermodynamic and kinetic analysis were performed on the basis of dynamic and adiabatic calorimetric applications which had been accepted as good assistants for investigating materials’ thermal decomposition. In essence, TBPB is reactive and exothermically unstable. Differential scanning calorimetry (DSC) and accelerating rate calorimeter (ARC) were employed to supply basic data and safety index. Experiments were taken under different scanning rates as well as various sample mass. The temperature and pressure curves of TBPB during decomposition were recorded. Based on the significant parameters calculated, self-accelerating decomposition temperature (SADT) of TBPB worked out was 50°C.
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Dissertations / Theses on the topic "Pressure differential scanning calorimetry"

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Belkharchouche, Mohamed. "Pressure differential scanning calorimetry studies and its relevance to in-situ combustion." Thesis, University of Salford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280747.

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Lee, Jaesung. "Calorimetric and microbiological evaluation of bacteria after exposure to food preservation treatments." Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1078597088.

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Thesis (Ph. D.)--Ohio State University, 2004.
Title from first page of PDF file. Document formatted into pages; contains xvi, 231 p.; also includes graphics (some col.) Includes bibliographical references (p. 212-224). Available online via OhioLINK's ETD Center
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Pillar, Rachel Joanne, and rachel pillar@flinders edu au. "The Influence of Rolling Oil Decomposition Deposits on the Quality of 55Al-43.4Zn-1.6Si Alloy Coatings." Flinders University. School of Chemistry, Physics and Earth Sciences, 2007. http://catalogue.flinders.edu.au./local/adt/public/adt-SFU20080108.132120.

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Uncoated defects in hot dip metal-coated steel products result from non-wetting of the steel surface by the molten alloy. The occurrence of uncoated defects is highly detrimental to product quality and production efficiency; uncoated defects compromise the appearance and anti-corrosion performance of hot dip metal-coated steel products and causes time delays in the application of subsequent surface treatments. Although many studies have been directed towards evaluating the effect of steel pre-heat temperature and oxidation on the formation of uncoated defects, fewer investigations have analysed how oil-derived residues remaining on steel surface following the cold rolling and furnace cleaning processes impact upon hot dip metallic coating quality. Furthermore, although a considerable amount of research has focussed on the process of deposit formation in lubricants used in other applications, the composition of oily residues remaining after the continuous annealing process, and the origins of these residues in the original rolling oil formulation, are poorly understood. The primary focus of the present work has been to gain an improved understanding of relationships between cold rolling oil composition, oil residue-formation characteristics and the occurrence of uncoated defects in 55Al-43.4Zn-1.6Si hot dip metallic coatings. Several key classes of rolling oil ingredients which decompose to leave high levels of thermally-stable residue have been identified. The thermal decomposition processes undergone by a variety ingredients within these classes have been studied under both oxidising and reducing conditions using Thermogravimetric Analysis (TGA) and Pressure Differential Scanning Calorimetry (PDSC) techniques, with chemical characterisation of the decomposition process and the resultant thermally-stable residue by infrared spectroscopy. Model blends of each ingredient in a typical cold rolling oil base ester have also been evaluated by TGA and PDSC to identify the impact of ingredient concentration and chemical structure on the amount of oily residue formed. The results of these investigations have been related to the impact of the ingredients on 55Al-43.4Zn-1.6Si hot dip metallic coating quality through the performance of industrial-scale hot dipping trials and hot dip simulation studies. In order to translate these results into a context more closely aligned with industrial conditions, the effect of processing variables, including furnace atmosphere and the availability/concentration of iron in contact with the rolling oil at the steel surface, on the decomposition process of a fully-formulated commercial cold rolling oil has also been investigated. The information gained can potentially be used to tailor operating conditions within the cold rolling/continuous hot dip metallic coating processes to enhance steel surface cleanliness. Finally, the deposit-forming tendencies of an array of different commercial cold rolling oils have been evaluated, leading to the development of a thermal analysis-based test for screening cold rolling oils with respect to their likely impact upon 55Al-43.4Zn-1.6Si hot dip metallic coating quality. This test, together with the understanding obtained on the effect of different rolling oil ingredients on hot dip metallic coating quality, can be used within the industry to formulate improved cold rolling oils.
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Batisai, Eustina. "Synthesis and sorption studies of porous metal-organic hosts." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/79803.

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Thesis (PhD)--Stellenbosch University, 2013.
ENGLISH ABSTRACT: The first part of this study describes the synthesis of new porous materials from basic building blocks. Five structurally related ligands namely: N,N'-bis(3-pyridylmethyl)-naphthalene diimide (L1), N,N'-bis(4-pyridylmethyl)-naphthalene diimide (L2), N,N'-bis(4-pyridylmethyl)- pyromellitic diimide (L3), N,N'-bis(3-pyridylmethyl)-pyromellitic diimide (L4) and 2-(pyridin-4- ylmethyl)-benzene tricarboxylic anhydride (L5) were synthesised. Ligands L1 and L2 were reacted with metal nitrates and carboxylates as co-ligands in a systematic manner with a view to obtaining potentially porous 3–D coordination polymers. Ten structurally diverse coordination polymers were obtained and they were characterised by single-crystal X-ray diffraction, powder X-ray diffraction and thermogravimetric analysis. Four of these compounds absorb moderate amounts of CO2 and, in addition, show sorption selectivity towards CO2 over N2. The reaction of L3 and L4 with transition metal halides yielded two 1–D chains, while the reaction of L5 with transition metal nitrates yielded seven coordination polymers of which four are 2–D and three are 1–D. Of the 2–D structures three are isostructural. The second part of this work describes a variable pressure study of a flexible metal-organic framework [Zn2(BDC)2(BPY)] (BPY = 4,4 -bipyridine and BDC = 1,4-benzene dicarboxylic acid). [Zn2(BDC)2(BPY)] is one of the few examples of a flexible metal-organic framework that undergoes phase transformations in response to gas pressure. The high pressure sorption recorded for this metal-organic framework displays two inflection steps in the pressure range 0 to 30 bar, possibly indicating two phase transformations. The gas-loaded structures for each phase transformation were determined by means of single-crystal X-ray diffraction. High-pressure differential scanning calorimetry was also carried out on the system in order to determine accurate gate-opening pressures, as well as the energies involved with each phase transformation. The results correlate with those obtained from single-crystal X-ray diffraction and high-pressure sorption. The final section reports the mechanochemical synthesis of two Werner complexes [NiCl2(4- PhPy)4] (1), [CoCl2(4-PhPy)4] (2) and their corresponding solid solution [Ni0.5Co0.5Cl2(4-PhPy)4] (3) (PhPy = phenyl pyridine). The solid solution could only be formed by mechanochemical synthesis and not by conventional solution crystallisation methods. The solid solution exhibits sorption properties that differ from those of the pure compounds.
AFRIKAANSE OPSOMMING: Die eerste deel van hierdie studie beskryf die sintese van nuwe poreuse stowwe uit basiese boublokke. Vyf struktureel verwante ligande naamlik: N,N'-bis(3-piridielmetiel)-naftaleen diimied (L1), N,N'-bis(4-piridielmetiel)-naftaleen diimied (L2), N,N'-bis(4-piridielmetiel)- piromellitien diimied (L3), N,N'-bis(3-piridielmetiel)-piromellitien diimied (L4) en 2-(piridiel-4- ielmetiel)benseen trianhidried (L5) is gesintetiseer. Ligande L1 en L2 is gereageer met metaal nitrate en karboksielsure as mede-ligande in 'n sistematiese wyse met 'n oog op die verkryging van potensieel poreuse 3–D koördinasie polimere. Tien struktureel diverse koördinasie polimere is verkry en hulle is gekarakteriseer deur enkel-kristal X-straal-diffraksie, poeier X-straal diffraksie en termo-analise (thermal analysis). Vier van hierdie verbindings het matige hoeveelhede CO2 geabsorbeer en, bykomend, wys sorpsie selektiwiteit van CO2 oor N2. Die reaksie van L3 en L4 met oorgangsmetaalhaliede het twee 1–D kettings gevorm, terwyl die reaksie van L5 met oorgangsmetaal nitrate sewe koördinasie polimere opgelewer het, waarvan vier 2–D en drie 1–D polimere is. Van die 2–D polimere het drie vergelykbare strukture. Die tweede deel van hierdie werk beskryf 'n veranderlike druk studie van 'n buigsame metaalorganiese raamwerk [Zn2(BDC)2(BPY)] (BPY = 4,4-bipiridien en BDC = 1,4-benseen dikarboksielsuur). [Zn2(BDC)2(BPY)] is een van die min voorbeelde van 'n buigsame metaalorganiese raamwerk wat fase transformasies (phase transformations) ondergaan in respons op ‘n verandering in gas druk. Die hoë-druk sorpsie aangeteken vir hierdie metaal-organiese raamwerk vertoon twee infleksie stappe in die gebestudeerde druk gebied (0 tot 30 bar), wat moontlik op twee fase transformasies dui. Die gas-gelaaide strukture vir elke fase transformasie is bepaal deur middel van enkel-kristal X-straal-diffraksie. Hoë-druk differensiële skandeer kalorimetrie (differential scanning calorimetry) is ook uitgevoer op die stelsel ten einde dié akkurate hekopenings druk, sowel as die energie betrokke by elke fase transformasie te bepaal. Die resultate stem ooreen met dié verkry vanaf enkel-kristal X-straal diffraksie en hoë-druk sorpsie. Die finale afdeling bespreek die meganochemiese sintese van twee Werner komplekse [NiCl2(4-PhPy)4] (1) en [COCl2(4-PhPy)4] (2) en hul ooreenstemmende vaste oplossing (solid solution) [Ni0.5Co0.5Cl2(4-PhPy)4] (3). Die vaste oplossing kan slegs gevorm word deur meganochemiese sintese en nie deur konvensionele oplossing kristallisasie metodes. Die vaste oplossing vertoon sorpsie eienskappe wat verskil van dié van die suiwer verbindings.
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Santos, Anne Gabriella Dias. "Avalia??o da estabilidade t?rmica e oxidativa dos biodieseis de algod?o, girassol, dend? e sebo bovino." Universidade Federal do Rio Grande do Norte, 2010. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17619.

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The search for new sources of environmentally friendly energy is growing every day. Among these alternative energies, biodiesel is a biofuel that has had prominence in world production. In Brazil, law 11.097, determine that all diesel sold in the country must be made by mixing diesel/biodiesel. The latter called BX, , where X represents the percent volume of biodiesel in the diesel oil, as specified by the ANP. In order to guarantee the quality of biodiesel and its mixtures, the main properties which should be controlled are the thermal and oxidative stability. These properties depend mainly of the chemical composition on the raw materials used to prepare the biodiesel. This dissertation aims to study the overall thermal and oxidative stability of biodiesel derived from cotton seed oil, sunflower oil, palm oil and beef tallow, as well as analyze the properties of the blends made from mineral oil and biodiesel in proportion B10. The main physical-chemical properties of oils and animal fat, their respective B100 and blends were determined. The samples were characterized by infrared and gas chromatography (GC). The study of thermal and oxidative stability were performed by thermogravimetry (TG), pressure differential scanning calorimeter (PDSC) and Rancimat. The obtained biodiesel samples are within the specifications established by ANP Resolution number 7/2008. In addition, all the blends and mineral diesel analyzed presented in conformed withthe ANP Regularion specifications number 15/2006. The obtained results from TG curves data indicated that the cotton biodiesel is the more stable combustible. In the kinetic study, we obtained the following order of apparent activation energy for the samples: biodiesel from palm oil > sunflower biodiesel > tallow biodiesel > cotton biodiesel. In terms of the oxidative stability, the two methods studied showed that biodiesel from palm oil is more stable then the tallow. Within the B100 samples studied only the latter were tound to be within the standard required by ANP resolution N? 7. Testing was carried out according to the EN14112. This higher stability its chemical composition
A busca por novas fontes de energia, que sejam ecologicamente corretas, cresce a cada dia. Dentre essas energias alternativas, o biodiesel ? um dos biocombust?veis que vem tendo destaque na produ??o mundial. No Brasil, a Lei n? 11.097, determina que todo diesel vendido no pa?s, deve ser constitu?do pela mistura de ?leo diesel/biodiesel, denominado BX, onde X representa o percentual em volume de biodiesel no ?leo diesel, conforme especifica??o da Ag?ncia Nacional do Petr?leo (ANP). Entre as principais propriedades que devem ser controladas para garantir a qualidade do biodiesel est?o as estabilidades t?rmica e oxidativa, as quais dependem, basicamente, da composi??o da mat?ria prima utilizada. Este trabalho tem como objetivo estudar a estabilidade t?rmica e oxidativa de biodieseis provenientes dos ?leos de algod?o, girassol, dend? e do sebo bovino, assim como analisar as propriedades das blendas feitas do ?leo mineral com biodiesel, na propor??o B10. Foram determinadas as principais propriedades f?sico-qu?micas dos ?leos vegetais e gordura animal, das respectivas amostras de B100 e suas misturas, al?m de caracteriza??es atrav?s de infravermelho e cromatografia a g?s. O estudo das estabilidades t?rmica e oxidativa foram realizados atrav?s de Termogravimetria (TG), Calorimetria Explorat?ria Diferencial sob Press?o (PDSC) e Rancimat. As amostras de biodiesel obtidas est?o dentro das especifica??es estabelecidas pela Resolu??o da ANP No7/2008. As misturas analisadas e o diesel mineral apresentaram todos os resultados em conformidade com as especifica??es da Portaria da ANP N?15/2006. Os resultados obtidos via TG apontam o biodiesel de algod?o como o mais est?vel. No estudo cin?tico, obteve-se a seguinte ordem de energia de ativa??o aparente: biodiesel de dend? > biodiesel de girassol > biodiesel de sebo > biodiesel de algod?o. Em rela??o ? estabilidade oxidativa os resultados obtidos via PDSC e Rancimat indicaram que o biodiesel de dend? foi o mais est?vel, e em seguida o de sebo. Dentre os B100 estudados, o de dend? e sebo bovino, se encontraram dentro dos padr?es exigidos na Resolu??o ANP N?7 (tempo de indu??o 6h), os ensaios foram realizados de acordo com a norma Europ?ia EN14112, a temperatura de 110?C. A maior estabilidade do biodiesel de dend? pode ser atribu?do ? sua composi??o qu?mica
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Thompson, M. "Matrix effects in differential scanning calorimetry." Thesis, Open University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.281223.

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Nikolopoulos, Christos. "Mathematical modelling of modulated-temperature differential scanning calorimetry." Thesis, Heriot-Watt University, 1997. http://hdl.handle.net/10399/659.

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Dumitrescu, Oana Roxana. "Simultaneous differential scanning calorimetry : Fourier Transform infrared spectroscopy." Thesis, Cranfield University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421231.

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Jiang, Zhong. "Temperature modulated differential scanning calorimetry : modelling and applications." Thesis, University of Aberdeen, 2000. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU603190.

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The research described in this thesis focused on the TMDSC technique with respect to both theoretical problems and applications. Theoretically, modelling work has been performed to address the effects of heat transfer in the measuring cell on both dynamic and quasi-isothermal TMDSC experiments. The problems of heat transfer generally influence the measured complex heat capacity and phase angle values, but eventually affect the precise measurements of other frequency dependent quantities such as the in-phase and out-of-phase heat capacities. A procedure has been suggested to correct the measured phase angle obtained by dynamic TMDSC using the scaled complex heat capacity trace (Chapter 3). The modulation frequency dependence of the instrumental phase angle has been fully investigated using more realistic models in terms of various heat transfer interface qualities, sample properties and sensor properties. In these models, it is emphasised that the measured temperatures are the sensor temperatures rather than the sample temperatures, thus, the contributions of the sensor's properties to the heat transfer are, for the first time, separated from the overall effects (Chapter 4 and Chapter 5). The consequent effects of heat transfer on the sample's heat capacity measurements are investigated based on the models suggested (Chapter 6). All the modelling results are compared with the corresponding experimental data obtained by ADSC (Mettler-Toledo Ltd) and they are in good agreement. Ripples and fluctuations which appear on the experimental signals during the glass transition and cold crystallisation transition have been simulated using* a simple model in which the period of the modulation signals changes with the time during the transitions, and then, been shown to be artefacts of the Fourier transformation process used by TMDSC evaluations (Chapter 7). The applications of TMDSC to both research and commercial samples are reported in terms of differing either the experimental conditions or the thermal history of the sample. Separating of time dependent kinetic processes from the time independent dynamic processes has been applied on the studies of the glass transition (for polycarbonate and poly(ethylene terephthalate)), the cold crystallisation (for poly(ethylene terephthalate)), the melting transition (for poly(ethylene terephthalate) and lead/tin alloys), the clearing transition of a liquid crystal polymer, and the vitrification of an epoxy resin under quasi-isothermal conditions. The main conclusion drawn from these studies is that the in-phase heat capacity is greatly influenced by the frequency of the temperature modulations even when the underlying heating (or cooling) rate remains the same. This strongly implies that the sample undergoes different structural change under different modulation conditions for the melting transition and clearing transition, but not for the glass transition and cold crystallisation. However, the interpretations of the in-phase heat capacity and out-of- phase heat capacity still need to be clarified. The detection of the glass transition and clearing point for the liquid crystal polymers, and the determination of wax appearance temperature for crude oils, show the ability of TMDSC for combining the sensitivity of a measurement at high instantaneous heating or cooling rates with the resolution obtained by measuring at a low underlying heating or cooling rates. The work on the isothermal curing of the epoxy resins displays the ability of TMDSC on measuring the heat capacity of the sample and its variation under the quasi-isothermal conditions. The frequency dependent complex heat capacity during the glass transition provides a window to measure the apparent activation energy of the transition, which is different, in some extent, from the window used by conventional DSC. The results are correlated by a shift factor. Some shortcomings of TMDSC, however, have been noticed in both modelling and application work. Firstly, any experiments for the purpose of either understanding or the quantitative measurements of TMDSC output quantities should be performed under carefully selected conditions which can satisfy the linear response assumption. Secondly, some signals in particular those associated with kinetic processes may not be fully sampled by TMDSC due to the limit of the observing window of a modulation. Thirdly, when the sensitivity is improved on TMDSC by separating the kinetics processes and noises from the dynamic processes, the TMDSC evaluation procedure introduces mathematical artefacts into the output signals. As a consequence, it is preferable to include as many temperature modulations as possible within any transition being studied in order to obtain good quality experimental signals by eliminating or minimising these artefacts, which, however, is not an easy task for some very abrupt transitions such as melting of metals.
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Miotto, Fernanda. "Reação de desinserção em SbxCoSb3-x." reponame:Repositório Institucional da UCS, 2010. https://repositorio.ucs.br/handle/11338/566.

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O composto SbxCoSb3-x foi produzido em altas pressões e altas temperaturas em uma reação de auto-inserção a partir da escuterudita binária CoSb3. A reação de auto-inserção é caracterizada pelo colapso de átomos de Sb para o sítio 2a, no interior das cavidades formadas pelos átomos de Co e Sb na estrutura da escuterudita. A reação inversa, de desinserção de Sb, ocorre quando o composto SbxCoSb3-x é aquecido à pressão ambiente. O acompanhamento desta reação de desinserção por meio de medidas de calorimetria exploratória diferencial (DSC), difração de raios X (DRX) e de resistividade elétrica constitui o objetivo principal deste trabalho. A amostra de CoSb3 foi sintetizada conforme rota proposta pela literatura. A síntese foi confirmada por meio de DRX, e não foi observada a presença de fases contaminantes. Amostras cilíndricas da fase SbxCoSb3-x foram obtidas submetendo CoSb3 a pressões de 7,7 GPa e temperaturas de até 550ºC, com o auxílio de prensas hidráulicas e câmaras toroidais disponíveis no Laboratório de Altas Pressões e Materiais Avançados LAPMA no Instituto de Física da Universidade Federal do Rio Grande do Sul IF/UFRGS. A presença da fase SbxCoSb3-x foi comprovada por meio de análises de DRX. Para determinação da resistividade elétrica de amostras ricas de fase SbxCoSb3-x foi desenvolvido um sistema DC, aplicável a amostras cilíndricas de pequeno volume tal como as obtidas em altas pressões e altas temperaturas. A aferição do sistema foi feita através de medidas de resistividade elétrica de materiais de referência (NIST-SRM 1461 e NIST-SRM 8426). As medidas de DSC revelaram a presença de dois eventos térmicos. Um pico endotérmico foi observado em 118ºC e não está associado a alterações estruturais e nem a variações significativas na resistividade elétrica. O evento exotérmico, que inicia em 180ºC, constitui a assinatura da desinserção dos átomos de Sb do interior da escuterudita, como verificado por análises de DRX e medidas elétricas. Após aquecimento até 350ºC, a amostra rica na fase SbxCoSb3-x retorna à fase estável, CoSb3. A reação de desinserção obedece a uma cinética de primeira ordem, cuja entalpia de transição é de aproximadamente 50 J /g e uma energia de ativação de 83 kJ/mol. A resistividade elétrica à temperatura ambiente de amostras ricas em SbxCoSb3-x é cerca de dez vezes inferior à do CoSb3. Este resultado, aliado possivelmente a uma baixa condutividade térmica, sugere que a fase de auto-inserção SbxCoSb3-x pode constituir um material termoelétrico de alto desempenho.
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The compound SbxCoSb3-x was produced at high pressures and high temperatures in a self-insertion reaction from the binary skutterudite CoSb3. The self-insertion reaction is characterized by the collapse of Sb atoms to the 2a site, into the cage formed by the Co and Sb atoms in the skutterudite structure. The opposite reaction, i.e., Sb desinsertion, occurs when the SbxCoSb3-x compound is heated at room pressure. This desinsertion reaction was followed by means of differential scanning calorimetry (DSC), X-ray diffraction (XRD) and electrical resistivity measurements, and its study constitutes the main objective of this work. The CoSb3 sample was synthesized as described in the literature. The synthesis was confirmed by XRD, and the presence of contaminant phases was not observed. Cylindrical samples of the SbxCoSb3-x phase were obtained by submitting CoSb3 at pressures of 7.7 GPa and temperatures up to 550ºC, with the aid of a toroidal high pressure cell available at the Laboratório de Altas Pressões e Materiais Avançados - LAPMA in the Instituto de Física of the Universidade Federal do Rio Grande do Sul - IF/UFRGS. The presence of the SbxCoSb3-x phase was confirmed by XRD analysis. In order to determine the electrical resistivity of samples rich in SbxCoSb3-x phase, a DC system was developed which is applicable to small volume cylindrical samples such as those obtained at high pressures and high temperatures. The calibration of the DC system was made by measurements of the electrical resistivity of reference materials (NIST-SRM 1461 and NIST-SRM 8426). The DSC measurements revealed the presence of two thermal events. An endothermic peak was observed at 118ºC which is not associated to structural changes neither significant variation in the electrical resistivity. The exothermic event that starts at 180ºC is the signature of the desinsertion of Sb atoms from the skutterudite cage, as verified by XRD analysis and electrical measurements. After heating to 350°C, the sample rich in the SbxCoSb3-x phase converts back to the stable phase, CoSb3. The desinsertion reaction follows a first-order kinetics, with a transition enthalpy of approximately 50 J/g and an activation energy of 83 kJ/mol. The electrical resistivity at room temperature of samples rich in SbxCoSb3-x is about ten times smaller than that of CoSb3. This result, along with a possible low thermal conductivity, suggests that SbxCoSb3-x may constitute a high performance thermoelectric material.
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Books on the topic "Pressure differential scanning calorimetry"

1

Belkharchouche, Mohamed. Pressure differential scanning calorimetry studies and its relevance to in-situ combustion. Salford: University of Salford, 1990.

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1941-, Hemminger W., and Flammersheim H. -J, eds. Differential scanning calorimetry. 2nd ed. Berlin: Springer, 2003.

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Höhne, G. W. H., W. F. Hemminger, and H. J. Flammersheim. Differential Scanning Calorimetry. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-06710-9.

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Höhne, G. W. H., W. Hemminger, and H. J. Flammersheim. Differential Scanning Calorimetry. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-662-03302-9.

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Reading, Mike, and Douglas J. Hourston, eds. Modulated Temperature Differential Scanning Calorimetry. Dordrecht: Springer Netherlands, 2006. http://dx.doi.org/10.1007/1-4020-3750-3.

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Höhne, G. Differential scanning calorimetry: An introduction for practitioners. Berlin: Springer-Verlag, 1996.

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Höhne, G. Differential scanning calorimetry: An introduction for practitioners. 2nd ed. Berlin: Springer, 2003.

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Elkordy, Amal Ali. Applications of calorimetry in a wide context: Differential scanning calorimetry, isothermal titration calorimetry and microcalorimetry. Rijeka, Croatia: Intech, 2013.

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Bershtĕin, V. A. Differential scanning calorimetry of polymers: Physics, chemistry, analysis, technology. Edited by Egorov V. M. New York: Ellis Horwood, 1994.

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Bershteĭn, V. A. Differential scanning calorimetry of polymers: Physics, chemistry, analysis, technology. Edited by Egorov V. M. New York: Ellis Horwood, 1994.

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Book chapters on the topic "Pressure differential scanning calorimetry"

1

Obuchi, Kaoru. "High Pressure Differential Scanning Calorimetry of Proteins: Attenuation of Peak." In Advances in High Pressure Bioscience and Biotechnology II, 473–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-05613-4_85.

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Lewis, Ruthven N. A. H., and Ronald N. McElhaney. "Differential Scanning Calorimetry (DSC), Pressure Perturbation Calorimetry (PPC), and Isothermal Titration Calorimetry (ITC) of Lipid Bilayers." In Encyclopedia of Biophysics, 452–59. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-16712-6_557.

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Niven, G. W., and B. M. Mackey. "Ribosome Analysis In Vivo by Differential Scanning Calorimetry: The Effects of High Pressure on Escherichia coli." In Advances in High Pressure Bioscience and Biotechnology, 43–46. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-60196-5_9.

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Wagner, Matthias. "Differential Scanning Calorimetry." In Thermal Analysis in Practice, 66–143. München: Carl Hanser Verlag GmbH & Co. KG, 2017. http://dx.doi.org/10.3139/9781569906446.007.

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Godin, Biana, Elka Touitou, Rajaram Krishnan, Michael J. Heller, Nicolas G. Green, Hossein Nili, David J. Bakewell, et al. "Differential Scanning Calorimetry." In Encyclopedia of Nanotechnology, 565. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-90-481-9751-4_100176.

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Vergnaud, J. W., and J. Bouzon. "Differential Scanning Calorimetry." In Cure of Thermosetting Resins, 213–68. London: Springer London, 1992. http://dx.doi.org/10.1007/978-1-4471-1915-9_13.

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Akash, Muhammad Sajid Hamid, and Kanwal Rehman. "Differential Scanning Calorimetry." In Essentials of Pharmaceutical Analysis, 199–206. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-1547-7_17.

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Höhne, G. W. H., W. Hemminger, and H. J. Flammersheim. "Introduction." In Differential Scanning Calorimetry, 1–6. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-662-03302-9_1.

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Höhne, G. W. H., W. Hemminger, and H. J. Flammersheim. "Types of Differential Scanning Calorimeters." In Differential Scanning Calorimetry, 7–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-662-03302-9_2.

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Höhne, G. W. H., W. Hemminger, and H. J. Flammersheim. "Theoretical Fundamentals of Differential Scanning Calorimeters." In Differential Scanning Calorimetry, 21–40. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-662-03302-9_3.

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Conference papers on the topic "Pressure differential scanning calorimetry"

1

Teeters, D., and N. P. Kemp. "Drilling Fluid Polymer Degradation Studies Using High-Pressure Differential Scanning Calorimetry." In SPE International Symposium on Oilfield Chemistry. Society of Petroleum Engineers, 1989. http://dx.doi.org/10.2118/18478-ms.

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Mcnamee, Kevin Patrick. "Evaluation of Kinetic Hydrate Inhibitor Performance by High-Pressure Differential Scanning Calorimetry." In Offshore Technology Conference. Offshore Technology Conference, 2011. http://dx.doi.org/10.4043/21604-ms.

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Melane, Chris, Hein Badenhorst, Luxolo Holo, Eino Vuroinen, Brian Rand, and Walter W. Focke. "Oxidative Stability of Carbon by Thermal Gravimetric Analysis." In ASME 2008 Pressure Vessels and Piping Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/pvp2008-61423.

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The Pebble Bed Modular Reactor (PBMR) is a High Temperature Gas Cooled nuclear Reactor (HTGR) with numerous inherent passive safety features. Graphite is the most important material of construction for the reactor core and the fuel pebbles. PBMR accident scenarios include uncontrolled air ingress into the reactor. Understanding the high temperature behavior of the graphite materials under such conditions is vital for design and accident modeling purposes [1]. Graphitic materials have a very high thermal stability compared to ordinary organics. The high degradation temperatures are beyond the capability of Differential Scanning Calorimetry (DSC) and thus necessitate the use of Differential Thermal Analysis (DTA) or Thermogravimetric Analysis (TG). The oxidative stability of two graphite samples was investigated using temperature scanning TG. It was found that air oxidation of a natural graphite sample commenced at temperatures that were significantly lower than those observed for a synthetic graphite sample. The natural graphite also showed peculiar bimodal mass loss rates.
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Mourad, Abdel-Hamid I., Omar G. Ayad, Ashfakur Rahman, Ali Hilal-Alnaqbi, and Basim I. Abu-Jdayil. "Experimental Investigation of Kevlar KM2Plus Nano-Reinforced Laminated Composite Thermo-Mechanical Properties." In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63857.

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This work is concerned with the synthesis and characterization of Multi-Walled Carbon Nanotube (MWCNT) reinforced Kevlar KM2Plus composites with various MWCNT contents (0.2, 0.3, 0.4, 0.5, 0.6, and 0.8 wt. %), by the wet lay-up technique. These samples were experimentally investigated for their thermo-mechanical properties using Thermo-Gravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), tensile testing and three-point bending techniques. The mechanical properties showed remarkable improvement with increasing MWCNT wt.% up to certain content. The results revealed that the addition of MWCNT fillers has no significant effect on the thermal stability of the composites.
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Abaas, Mustafa. "EFFECT OF THE CRUDE OIL COMPOSITION ON THE OXIDATION BEHAVIOR BY HIGH-PRESSURE DIFFERENTIAL SCANNING CALORIMETRY (HP-DSC)." In 18th International Multidisciplinary Scientific GeoConference SGEM2018. Stef92 Technology, 2018. http://dx.doi.org/10.5593/sgem2018/1.4/s06.057.

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Yuan, Chengdong. "THE PYROLYSIS BEHAVIOR OF CRUDE OIL SARA FRACTIONS AND THE EFFECT OF PRESSURE ON CHARACTERIZED BY DIFFERENTIAL SCANNING CALORIMETRY (DSC)." In 18th International Multidisciplinary Scientific GeoConference SGEM2018. Stef92 Technology, 2018. http://dx.doi.org/10.5593/sgem2018/1.4/s06.119.

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I. Mourad, Abdel-Hamid, Mouza S. Al Mansoori, Lamia A. Al Marzooqi, Farah A. Genena, and Nizamudeen Cherupurakal. "Optimization of Curing Conditions and Nanofiller Incorporation for Production of High Performance Laminated Kevlar/Epoxy Nanocomposites." In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-85067.

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Kevlar composite materials are getting scientific interest in repairing of oil and gas pipelines in both offshore and onshore due to their unique properties. Curing is one of the major factor in deciding the final mechanical performance of laminated Kevlar/epoxy nanocomposites. The parameters such as curing time, temperature and applied pressure during the hot pressing will affect chemistry of crosslinking of the epoxy matrix and interaction of epoxy with the Kevlar fiber. The present study is carried out to evaluate the optimal curing conditions of the Kevlar/epoxy nanocomposites. Three different nanofillers (namely Multi walled Carbon nanotubes (MWCNT), Silicon Carbide (SiC) and Aluminum Oxide (Al2O3)) are incorporated in different weight percentage. Differential Scanning Calorimetry (DSC) and Thermo-Gravimetric Analysis (TGA) tests are carried out to determine the thermal stability and optimal curing conditions. Mechanical performance is investigated by conducting flexure, and drop weight tests. The results show that, the optimal curing temperature for maximizing the mechanical properties is at 170°C. Peeling off the Kevlar layers are observed for nanocomposite samples cured under 100°C. Mechanical strength of the composites is enhanced by optimizing the curing conditions and nanofiller contents.
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Bakhtiyarov, Sayavur I., Elguja R. Kutelia, and Dennis A. Siginer. "Thermometric Studies of Newly Developed Nanolubricants." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65040.

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One of the primary requirements of space lubricants is that they have extremely low vapor pressures to withstand the space vacuum environment. Nanolubricants are known to have extremely low vapor pressure and some have attractive lubricant properties such as low coefficient of friction and good lifetimes. However, many other physical properties need to be evaluated in bringing forth new space liquid lubricants such as wide liquid temperature range and adequate heat transmission capabilities. The heat capacity and heat flow measurements for two newly developed nanolubricants Kolkhida 1 and Kolkhida 2 were conducted using Modulated Differential Scanning Calorimetry (MDSC). The experimental results revealed that the tested ionic liquids have large heat storage capacity as compare to the conventional heat transfer fluids.
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Zuo, Lei, Xiaoming Chen, and Ming Lu. "Design and Fabrication of Differential Scanning Nanocalorimeter for Biological Applications." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-48704.

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This paper describes the design, fabrication, and characterization of a differential scanning nanocalorimeter that has potential to significantly reduce the sample volume to microliter and improve the temperature sensitivity to 10 μK. The nanocalorimeter consists of a polymeric freestanding membrane, four high-sensitive low-noise thermistors based on the silicon carbide (SiC), and a platinum heater and temperature sensor. With the integrated heater and sensors, temperature scanning and power compensation can be achieved for calorimetric measurement. Temperature sensing SiC film was prepared by using sintered SiC target and DC magnetron sputtering under different gas pressure and sputtering power. The SiC sensing material is characterized through the measurement of current-voltage curves and noise levels. Thermal performance of a fabricated nanocalorimeter is studied in simulation and experiment. The results indicate the device has a nano watt thermal power sensitivity, 10 μK temperature sensitivity, and long time constant to hold thermal energy, which leads to low-volume ultra sensitive nanocalorimetry for biological process, such as protein folding and ligand binding.
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Aiduganov, D., D. Balkaev, M. Varfolomeev, and D. Emelianov. "Effect of formation water and hydrochloric acid on the physical and chemical properties of polymer materials of high pressure pipelines used for transportation of crude oil." In General question of world science. L-Journal, 2020. http://dx.doi.org/10.18411/gq-30-11-2020-17.

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The purpose of the work is to conduct a comparative analysis of the stability of two types of polymer coatings to the effects of formation water and hydrochloric acid based on the analysis of mechanical properties, thermal stability and surface morphology. To accomplish the task, modern physical-chemical methods were used: differential scanning calorimetry, microscopy, an electromechanical universal testing machine, a dilatometer. Simulation of the effect of water at elevated temperatures and pressures on the polymer coating samples was carried out in an autoclave-reactor, the study of the effect of acid was carried out in a glass beaker. On the basis of the work carried out, results were obtained that show similarities and differences in the behavior of the polymer samples studied. The change of the dynamic modulus of elasticity and the coefficient of linear thermal expansion with increasing temperature is investigated. In general, it has been shown that PE-RT polymer has better characteristics than PE polymer. However, both of them are stable to the exposure of formation water and hydrochloric acid and can protect corrosion of high pressure pipes connections.
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Reports on the topic "Pressure differential scanning calorimetry"

1

Marangoni, Alejandro G., and M. Fernanda Peyronel. Differential Scanning Calorimetry. AOCS, April 2014. http://dx.doi.org/10.21748/lipidlibrary.40884.

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Fleszar, Mark F. Lead-Tin Solder Characterization by Differential Scanning Calorimetry. Fort Belvoir, VA: Defense Technical Information Center, January 2000. http://dx.doi.org/10.21236/ada373333.

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Black, Patrick B., and Dean Pidgeon. Purity Determination of Standard Analytical Reference Materials by Differential Scanning Calorimetry. Fort Belvoir, VA: Defense Technical Information Center, May 1990. http://dx.doi.org/10.21236/ada224669.

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Fleszar, Mark F. Differential Scanning Calorimetry as a Quality Control Method for Epoxy Resin Prepreg. Fort Belvoir, VA: Defense Technical Information Center, December 1988. http://dx.doi.org/10.21236/ada204291.

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Edgar, Alexander Steven. A Modulated Differential Scanning Calorimetry Method for Characterization of Poly(ester urethane) Elastomer. Office of Scientific and Technical Information (OSTI), March 2018. http://dx.doi.org/10.2172/1427360.

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Beyer, Frederick L., Eugene Napadensky, and Christopher R. Ziegler. Characterization of Polyamide 66 Obturator Materials by Differential Scanning Calorimetry and Size-Exclusion Chromatography. Fort Belvoir, VA: Defense Technical Information Center, December 2005. http://dx.doi.org/10.21236/ada444191.

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Story, Natasha Claire. Investigating the Thermal Behavior of Polymers by Modulated Differential Scanning Calorimetry (MDSC) – A Review. Office of Scientific and Technical Information (OSTI), June 2020. http://dx.doi.org/10.2172/1633549.

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Coker, Eric. The oxidation of aluminum at high temperature studied by Thermogravimetric Analysis and Differential Scanning Calorimetry. Office of Scientific and Technical Information (OSTI), October 2013. http://dx.doi.org/10.2172/1096501.

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Dang, Yuhong, V. M. Malhotra, and K. S. Vorres. Effects of particle size on the desorption kinetics of water from Beulah-Zap lignite coal: Differential scanning calorimetry results. Office of Scientific and Technical Information (OSTI), March 1996. http://dx.doi.org/10.2172/206632.

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