Thematische Bibliographien / Physico-chemical analyzes

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Auswahl der wissenschaftlichen Literatur zum Thema „Physico-chemical analyzes“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 15. Februar 2022

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Zeitschriftenartikel zum Thema "Physico-chemical analyzes"

Prekalla, Jetmir, Nexhdet Shala und Arsim Elshani. „SENSORY PROPERTIES AND PHYSICO-CHEMICAL ANALYZES OF PASTEURIZED MILK“. International Journal of Ecosystems and Ecology Science (IJEES) 9, Nr. 3 (12.08.2019): 523–28. http://dx.doi.org/10.31407/ijees9315.

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Scripca, Laura A., und Sonia Amariei. „Research on Honey Crystalization“. Revista de Chimie 69, Nr. 10 (15.11.2018): 2953–57. http://dx.doi.org/10.37358/rc.18.10.6660.

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Crystallization of honey is a natural process and guarantee of authenticity. The aim of the study is to evaluate the influence of physico-chemical parameters on the process of crystallization and on crystal size. The interest in studying the factors influencing the crystallization process is due to the fact that most consumers, especially children, are reserved for the purchase and consumption of a crystallized honey, the commercial aspect being very important to them. Three samples of honey of different floral origins were used for the physico-chemical and microscopic analysis. The analyzes were carried out throughout 30 days every sample in triplicate. In terms of physicochemical following parameters were analyzed: acidity, diastase index, hydroximethylfurfural, humidity, invert sugar, glucose, fructose, fructose / glucose ratio and the microscopic analyze of crystals size. The parameter values resulting from the research study are in accordance with the legislation in force. Statistical analysis of experimental data highlights the influence of ratio fructose / glucose and humidity on the honey crystallization.

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Lopes de Araújo, Sinthya Meire, und Alex Augusto Gonçalves. „A New Ready-To-Bake Seafood Meal Based on Pacific White Shrimp: Product Development, Cost Evaluation, Consumer Acceptability, and Shelf Life Stability“. Open Food Science Journal 11, Nr. 1 (28.02.2019): 18–24. http://dx.doi.org/10.2174/1874256401911010018.

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Background: Considering that consumers are increasingly demanding and attentive to a healthy diet, while also looking for food that is easy to prepare, the objective of this work was to develop a new value-added product with Pacific white shrimp. Methods: Fresh shrimps were headless, eviscerated, cut, washed, immersed in brine (10% NaCl + 5% sodium tripolyphosphate – STPP, 30 min), drained, weighed, immersed in sweet-sour sauce (15 min), drained, stuffed with cream cheese, weighed, vacuum packed, frozen (-30°C / 24h), and stored (-18ºC). Microbiological, centesimal composition and physico-chemical analyzes were performed for fresh and stuffed shrimp. Confirmed the microbiological safety, samples were baked (180ºC, 20 min) and sensorially evaluated. The shelf life study for the frozen stuffed shrimp was carried out during 180 days of storage (-18ºC) and at each 45 days, samples were withdrawn for microbiological and physico-chemical analyzes. Results: All parameters analyzed were within the limits of Brazilian legislation, which demonstrated the initial shrimp freshness, and hygienic health care. The overall acceptance test was 8.72, the acceptability index of 96% and purchase intention of 82%. The final cost per piece was lower and viable. The nutritional value was in accordance to the literature for this shrimp, and the physico-chemical results during the shelf life evaluation were stable. Conclusion: The vacuum packaging, and freezing storage, associated with hygienic-sanitary care promoted the stability of microbiological assessment, and physical-chemical properties, and the overall quality and safety product for the consumer, which can be a new alternative for the shrimp industry.

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Popa, Ionuţ Radu, Mihaela Tiţa, Letiţia Oprean, Ramona Iancu, Ecaterina Lengyel und Adina Frum. „Researches on Physico-Chemical and Microbiological Characteristics of Sheep and Cow Milk from Cristian Farm, Romania“. Acta Universitatis Cibiniensis. Series E: Food Technology 18, Nr. 1 (01.06.2014): 77–84. http://dx.doi.org/10.2478/aucft-2014-0009.

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Abstract This study was conducted over a period of three month in the Cristian farm, Sibiu. For the physical, chemical and microbiological analyzes were taken a number of 15 samples per month. From physico-chemical point of view the content evolution of fat, not fat solid substance, density, protein, freezing point, temperature, lactose, conductivity, pH, water addition was followed. Samples were analyzed using the milk analyzer Ekomilk Total of the Research Centre in Biotechnology and Microbiology of the "Lucian Blaga" University. The microbiological contamination of milk was done by determining the total number of bacteria and coliform bacteria. From microbiological point of view it was observed that these conditions are largely met, but a more rigorous control on the cleanliness of utensils and of the staff is required.

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Hauryliuk, A. N., O. B. Dormeshkin und G. Kh Cherches. „Physico-chemical features of acid decomposition of dolomite“. Proceedings of the National Academy of Sciences of Belarus, Chemical Series 57, Nr. 1 (10.02.2021): 109–18. http://dx.doi.org/10.29235/1561-8331-2021-57-1-109-118.

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The results of studies of the physico-chemical regularities of the acid decomposition of magnesium-containing raw materials are presented and the optimal technological mode of the individual stages of obtaining magnesium sulfate is determined. It has been established that the process of obtaining magnesium sulfate based on dolomite includes the following stages: decomposition of magnesium-containing raw materials with sulfuric acid; filtration of the resulting suspension with separation of calcium sulfate and insoluble residue and subsequent washing; crystallization and separation of magnesium sulfate; drying the target product. The main technological parameters that determine the stage of sulfuric acid decomposition are: the rate of sulfuric acid, the duration of decomposition, the method and procedure for introducing reagents, the content of magnesium sulfate in the liquid phase of the suspension. In this case, the concentration of sulfuric acid cannot be considered as the main technological parameter, since its numerical value is selected depending on the value of the final content of magnesium sulfate in the liquid phase, which in turn is determined by its solubility in water. It has been proven that the use of a flocculant at the decomposition stage provides an increased filtration rate, improved filtration performance, as well as keeping the filter cloth uncontaminated. The results of chemical and X-ray phase analyzes confirmed that magnesium sulfate obtained from domestic dolomite raw materials in its composition corresponds to magnesium sulfate obtained from foreign types of magnesium-containing raw materials - magnesite, brucite - and fully complies with the requirements of TU 2141016-32496445-00 “Magnesium sulfate”.

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Dufka, Ámos, und Tomáš Melichar. „The Evaluation of the Effect of Crystallization Additives on Long Term Durability of Cement Composites“. Solid State Phenomena 276 (Juni 2018): 265–70. http://dx.doi.org/10.4028/www.scientific.net/ssp.276.265.

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The article deals with the influence of crystallization additives on the life of self-compacting concrete (so-called SCC concrete), which are exposed to chemically aggressive environments. The focus is not only on the effect of the crystallization additive on the characteristics of the capillary-pore structure of SCC concrete, but especially long life durability of self-compacting concrete (two years expozition). The effect of individual types of aggressive environment is assessed on the basis of a set of physico-mechanical and physico-chemical analyzes.

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Amaral, Sheyla Maria Barreto, Felipe Sousa da Silva, Raimunda Valdenice da Silva Freitas, Maria Jéssica de Almeida Souza, Luana Guabiraba Mendes und Antônio Belfort Dantas Cavalcante. „Microbiological and physical chemical evaluation of traditional cream cheese brands with different market value“. Research, Society and Development 9, Nr. 10 (20.09.2020): e1439108262. http://dx.doi.org/10.33448/rsd-v9i10.8262.

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The objective of this study was to evaluate the physical-chemical and microbiological characteristics of four brands of traditional cream cheeses with different market value. Three batches of the four commercial brands of cream chesses were acquired, totaling 12 samples. The differences in pH, titratable acidity, starch, fat in dry extract, moisture, ash, lipids, protein, and carbohydrates were measured by physico-chemical analyzes, while the of thermotolerant coliforms and Staphylococcus aureus spp. counts were performed by microbiological analyzes. Regarding the four evaluated brands, < 3 Most Probable Number of thermotolerant coliforms and an absence of colonies characteristic of Staphylococcus aureus were found. There was no significant difference between the brands studied at 5% of significance for the fat in dry extract, moisture, ash and lipids. All the analyzed cream cheese samples differed significantly (p < 0.05) for the starch content. The analyzed samples showed satisfactory hygienic-sanitary quality. The physical-chemical evaluation results presented standardization in the cream cheese preparation, regardless of the amount charged, however, there was a lack of information on the use of starch on all labels.

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Cherim, Melat, Rodica Sirbu, Aneta Tomescu, Marius Florentin Popa und Emin Cadar. „Comparative Studies on the Physico-chemical Characteristics of Bio-materials with Collagen from Calf and Fish Skins from Black Sea“. Materiale Plastice 56, Nr. 1 (30.03.2019): 179–85. http://dx.doi.org/10.37358/mp.19.1.5147.

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Collagen hydrolysers are three-dimensional polymeric materials with limited cross-linking and high hydrophilicity, having multiple medical applications. The most used collagen is the one extracted from bovine skin, which is now the industrial source of collagen. Due to the outbreak of some threatening diseases such as BSE, transmissible spongiform encephalopathy, foot-and-mouth disease, researchers have sought a safer alternative to collagen. This was the marine resource, which offered multiple opportunities to capitalize on clean sea-water raw material. This paper presents a comparative study of the physico-chemical properties of collagen hydrogels derived from collagen obtained from calf and skin from the Black Sea. Physico-chemical and spectrophotometric analyzes were performed to determine the structure. Studies have been conducted to analyze rheological behavior, antioxidant activity and antimicrobial activity. The total antioxidant capacity (ACL) is higher for collagen mixtures with 40% ethyl alcohol and shows higher values for fish collagen compared to calf collagen. Antimicrobial analysis shows that all collagen hydrogels show antimicrobial activity, both gram-positive (Staphylococcus aureus ATCC 6538P) and gram-negative (Escherichia coli ATCC 10536), which increases with increasing collagen concentrations.

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Kovalevska, I. V., und O. A. Ruban. „Research of physico-chemical and technological properties of thioctic acid“. Farmatsevtychnyi zhurnal, Nr. 6 (14.08.2018): 71–78. http://dx.doi.org/10.32352/0367-3057.6.16.05.

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Characteristics and relevance of article topic. Analysis of the literature data shows that the thioctic acid preparations are widely used in the treatment of various diseases. At it’s parenteral application inter- and intraindividual level at the plasma can vary significantly. Therefore, the bioavailability of thioctic acid according to the results of clinical researches is only 30% and efficacy largely dependent on the technological features of the dosage form manufacturing process. The goal of paper was researches of the thioctic acid physico-chemical properties for development of composition and technology of solid dosage form with improved bioavailability. Thioctic acid was the object of the study. The complex of physical, chemical and technological tests were used during researches: microscopic, thermal analyzes studies of bulk density, flowability, compression ratio, hygroscopicity, dissolution. Conclusions. According to thermal analysis, thermal stability of thioctic acid sample has been established within 20–180 °C. The results can be used for explanation the temperature regime in the preparation of solid dispersions of thioctic acid by the melting method. Solubility determination according to SP of Ukraine II-ed. and microscopic method showed that the substance is readily soluble in 96% ethanol, which leads to the conclusion about the possibility of preparation thioctic acid solid dispersions by dissolution method. During researches were established physico-chemical and technological properties of the thioctic acid substance, produced by Shanghai modern pharmaceutical Co., LTD (China). Were established that the substance is hygroscopic as evidenced by the change in appearance and weight. It was determined that the substance does not have a satisfactory yield (Carr index – 1,39, slope angle – 60°), compression ratio is 0,495, which is indicative of the lack of sample strength after the removal of pressure. The results of the studies suggest that the physicochemical properties of the substance needed modifications in the manufacture of solid dosage forms with thioctic acid.

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Karuppasamy, Karuppasamy, Sethuramachandran Thanikaikarasan, D. Eapen, Rajendran Antony, Subramaniam Balakumar, Thaiyan Mahalingam und Xavier Sahaya Shajan. „Effect of Nanochitosan on Structural, Thermal and Electrochemical Properties of Poly Ether Based Polymer Electrolytes Complexed with Lithium Bis(Trifluoromethanesulfonyl Imide)“. Journal of New Materials for Electrochemical Systems 17, Nr. 3 (03.10.2014): 197–203. http://dx.doi.org/10.14447/jnmes.v17i3.422.

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In this research, nanocomposite membranes were prepared using polyethylene oxide as polymer host, lithium bis(trifluoromethanesulfonyl imide) as salt and nanochitosan as inert filler. Initially nanochitosan was prepared from chitosan by ionotropic gelation method. Nanocomposite membranes were prepared by solvent free membrane hot press technique. The prepared membranes possessed excellent physico-chemical properties. The complexing behavior and structural reorganization in polymer electrolytes were analyzed by XRD and FT-IR analyzes. The decrease in crystalline nature of polymer electrolytes was confirmed by DSC analysis. The electrolyte S3 possessed high conductivity and attained a maximum of 10-3.01S/cm.

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Dissertationen zum Thema "Physico-chemical analyzes"

Powell, Francis E. „Physico-chemical studies in flow analysis“. Thesis, Loughborough University, 1990. https://dspace.lboro.ac.uk/2134/25925.

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The first part of this study was the characterisation of an impinging jet electrode in an amperometric detector; the device having found extensive application in flow injection analysis. A voltammetric study of the detector in the stopped flow mode was carried out and evidence is presented of restricted diffusion imposed by the shallow depth of the cell. In hydrodynamic voltammetry, the detector exhibited a gradual progression from thin-layer to wall jet behaviour as the flow rate increased. This gradation is discussed in terms of a model in which flow in the electrode chamber forms concentric rings, the streamlines being successively perpendicular, oblique and parallel to the electrode. The response of the detector and its associated equipment was studied by two experiments. Firstly, the fidelity of the electrochemical instrumentation and recording system was ascertained from its electronic response to a RC (resistance-capacitance) circuit functioning as a flow injection transport analogue. Secondly, the dynamic response of the electrochemical cell was established from an experiment using a concentration step input delivered through a short, straight manifold. The results indicated that laminar flow in the delivery tube was modified by mixing stages in the cell channel and its connections to produce a final dispersion which defines an effective detection volume of only 7μL. The electronic and cell responses indicate that the total detection system would impose little extra dispersion in a practical flow injection line. In the second part of this study, photometric titrations were carried out in a stirred tank reactor in which the volume changed linearly with time. The general relation for the concentration gradient when the tank is used as a mixing device was examined experimentally under various flow conditions. In particular, the precision of linear concentration gradients was ascertained when peristaltic pumping was employed. These gradients were utilised to titrate analyte within the tank by means of titrant delivered by pump flow with photometric detection in an exit stream. Self-indicating titrations, following changes in the absorbance of analyte, titrant or reaction product, were performed each conforming to theoretical prediction. Due to the external detection system employed, dispersion and transportation lag effects were observed and accounted for.

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Ševčík, Marek. „Vývoj kompozitů na bázi alkalicky aktivovaných matric odolných vůči působení extrémních teplot“. Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2021. http://www.nusl.cz/ntk/nusl-444262.

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The diploma thesis is focused on the development of composites from alkali activated materials (AAM) and their resistance to extreme temperatures. The theoretical part describes alkaline activation and precursors for the production of AAM. Furthermore, the problem of the effect of extreme temperatures on these materials is described. In the experimental part, the optimal silicate modulus with respect to the properties of AAM was gradually determined, and the effect of extreme temperatures on the AAM matrix was verified. In the next stage, the effect of the filler with respect to the behavior at extreme temperatures was tested and then the final formulation was optimized.

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Díez, Orrite Silvia. „Physico-chemical properties of polymers at interfaces“. Doctoral thesis, Universitat Rovira i Virgili, 2002. http://hdl.handle.net/10803/8511.

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A polymer is a large molecule constructed from many smaller structural units called
monomers joined together by covalent bonds. Polymers have existed in natural form
since life began and those such as DNA, RNA, proteins and polysaccharides are some
of the most important macromolecules found in plant and animal life. From the earliest
times, the man has used many of these polymers as materials for providing clothing,
decoration, tools, weapons and other requirements. However, the origins of today's
polymer industry commonly are accepted as being in the nineteenth century when
important discoveries were made concerning to the modification of certain natural
polymers, as cellulose. The use of synthetic and natural polymers as stabilisers for
colloid systems (sols, dispersions, microemulsions, etc.) is becoming more important
everyday in contemporary life. Polymer additives can be applied in preconcentrations
and dehydration of suspensions in mineral processing, purification of wastewater and
even in nutritional and pharmaceutical emulsions being their importance related to the
characteristics of the process and the properties that they show. The present work aims
to develop appropriate numerical and analytical modelling techniques, which can
describe (considering the formation of loops and tails) the structure of a polymeric layer
adsorbed on heterogeneous surfaces; this adsorbed layer is an relevant factor in the
properties showed by this kind of materials. Taking into account this, the methodology
known as Single Chain Mean Field (SCMF) (originally used to study micellar
aggregates and grafted polymers) was modified to apply on polymer adsorption
problems. In this way, it was possible to calculate numerically properties that can be
experimentally measured, such as total monomer volume fraction profiles, loop and tail
volume fraction profiles, adsorbance or the thickness of the adsorbed layer. The
structure of the polymeric layer was examined both for flat and spherical (colloidal
particles) surface geometries. When compared with other well established
methodologies for the numerical simulation of polymeric systems, this new version of
SCMF was found to be more efficient due to the improved sampling of the polymer
chain configuration space.
Thus, SCMF method results, in the case of the adsorption on flat surfaces, compare well
with those obtained either with Monte Carlo simulations or with the method developed
in the 80s by Scheutjens and Fleer (SCF). Due to the lack of studies focusing to polymer
adsorption on colloidal particles, our results have been the first to present quantitative
predictions of the structure of the polymeric layer adsorbed on a spherical surface. Thus,
we have demonstrated the dependence of the adsorbed polymer layer with the size of
the colloidal particle as well as the characteristic lengths that influence on it. Finally, in
this work an analytical approach for the description of polymer-colloidal mixtures has
been developed which compares well with the numerical results obtained from the
SCMF methodology. Furthermore, the analytical approach is able to predict system
behaviours, as for example the formation of gels.
Un polímero es una molécula de grandes dimensiones formada de pequeñas unidades
llamadas monómeros, los cuales se encuentran unidos por medio de enlaces covalentes.
Los polímeros han existido de forma natural desde el comienzo de la vida, y aquellos
como el DNA, RNA o las proteínas son algunos de los polímeros más importantes
encontrados tanto en la vida animal como en la vegetal. Desde siempre el hombre ha
utilizado muchos de estos polímeros como materiales para hacer ropa, decoración,
herramientas, etc. Sin embargo, el origen de la industria de polímeros que conocemos
hoy en día se produjo en el siglo 19, gracias a importantes descubrimientos dentro de la
modificación de ciertos polímeros naturales, como la celulosa. El uso de polímeros
sintéticos y naturales como estabilizadores de sistemas coloidales (dispersiones,
microemulsiones, etc.) juega en nuestros días un papel importante. Los polímeros
utilizados como aditivos, pueden ser aplicados en preconcentraciones y deshidratación
de suspensiones dentro de procesos minerales, tratamiento de aguas residuales e incluso
los podemos encontrar dentro de la industria farmacéutica y alimentaria, donde su
importancia es debida a la procesabilidad y propiedades que ellos exhiben. El trabajo
que se presenta es orientado al desarrollo de técnicas de modelización, tanto analíticas
como computacionales, y su aplicación en la descripción (por medio de la formación de
bucles y colas) de la estructura de la capa de polímeros adsorbida en superficies
heterogéneas, siendo dicha capa de polímeros un factor importante en las propiedades
que este tipo de materiales presentan. Con este propósito, la metodología conocida
como Single Chain Mean Field, utilizada anteriormente tanto para el estudio de
agregados micelares como de polímeros anclados en superficies, ha sido modificada
para describir la adsorción de polímeros en superficies. Así se han podido calcular
numéricamente propiedades medibles experimentalmente como los perfiles de la
fracción en volumen de monómeros totales, además de los pertenecientes a los bucles y
colas, adsorbancia o el espesor de la capa adsorbida, para geometrías de la superficie
absorbente tanto plana como esférica (partículas coloidales). En su comparación con
otras metodologías, ya establecidas para la simulación numérica dentro de la física de
polímeros, la aplicación de esta nueva versión del Single Chain Mean Field (SCMF)
ha resultado ser más eficiente debido a un mejor muestreo del espacio de
configuraciones de las cadenas poliméricas. De este modo, comparando los resultados
obtenidos a partir del SCMF, con aquellos obtenidos mediante técnicas de simulación
Monte Carlo o la teoría desarrollada en los años 80 por Scheutjens y Fleer (SCF), se ha
podido encontrar un buen acuerdo en las propiedades calculadas para el caso de la
adsorción en superficies planas. Debido a la dificultad intrínseca del estudio de la
adsorción en superficies curvadas, nuestros resultados son los primeros que presentan
predicciones cuantitativas sobre la estructura de la capa que se forma sobre una
partícula coloidal. Así hemos podido comprobar la dependencia de la estructura de la
capa de polímeros adsorbidos con el tamaño de la partícula sobre la que se encuentran
adsorbidos además de las longitudes características de las cuales depende. Finalmente,
en este trabajo se ha desarrollado, también, una teoría analítica para la descripción de la
mezcla polímero-coloide. De este modo, los resultados numéricos obtenidos con el
SCMF han podido ser comparados con dicha teoría, obteniendo, de nuevo, un buen
acuerdo y predecir, además, comportamientos colectivos como la formación de geles.

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Ghelawi, Mohamed Ali. „A physico-chemical analysis of irradiated dates (Phoenix dactylifera L.)“. Thesis, University of Salford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360402.

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Sarkar, Amit Kumar. „Fullerenes and non-planar graphitic networks : a physico-chemical analysis“. Thesis, University of Sussex, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387366.

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Guerreiro, A. „Rational analysis of physico-chemical parameters affecting recognition properties of molecularly imprinted polymers“. Thesis, Cranfield University, 2006. http://dspace.lib.cranfield.ac.uk/handle/1826/11014.

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Molecularly imprinted polymers (MIPs) are new type of materials with tailor made molecular recognition sites. Despite their enormous potential in separations, sensing and pharmaceutical industry, MIPs have so far failed to achieve significant commercial application. This is in part due to lack of understanding of MIPs at a molecular level, strong binding site heterogeneity and poor compatibility with aqueous solvents. This work is aimed at improving overall MIP performance and quality, with special focus on the improvement of compatibility with aqueous environment. Compatibility with aqueous solvents was achieved by (i) employing a molecular modelling step prior to polynerisation, (ii) by studying the ionic properties of the polymer and (iii) by analysis of the influence of different polymerisation conditions. The study of the pressure and magnetic field effects on polymers allowed us to produce materials with increased stability, lower binding site heterogeneity and higher affinity, as compared to standard imprinted materials. To minimise site heterogeneity imprinted nanoparticles with ca. 90 kDa were produced using a living polymerisation method. The particles with essentially uniform population of binding sites were obtained by employing affinity chromatography with immobilised template. As a model system variety of drugs were imprinted with the polymers being able to discriminate between closely related structural analogues in aqueous media. This work had substantial effect on success of project Pisarro - Piezoelectric Sensing Arrays for Biomolecular Interactions and Gas Monitoring where range of imprinted polymers were designed with high affinity to drugs of abuse. Currently 1 work is in progress aimed at application of these materials in commercial sensors for forensic use.

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Guerreiro, António. „Rational analysis of physico-chemical parameters affecting recognition properties of molecularly imprinted polymers“. Thesis, Cranfield University, 2006. http://dspace.lib.cranfield.ac.uk/handle/1826/11014.

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Al-Awad, Musaed Naser J. „Physico-chemical analysis of shale-drilling fluid interaction and its application in borehole stability studies“. Thesis, Heriot-Watt University, 1994. http://hdl.handle.net/10399/1368.

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Shale is often the most difficult of all formations to maintain a stable wellbore in when drillincr ::> for oil and gas. Time and money spent overcoming this problem during drilling, together with overall reduced profit margins. has led the oil industry to devote considerable time and effort to solve the problem of unstable boreholes in shales. It has long been established that the moisture adsorption (or desorption) of shale rocks can be controlled by the salinity of drilling fluid. When compacted shale (under constant compaction stress) adsorbs moisture, its total volume increases and swelling strains develop. Developed swelling strains then become an integral part of the effective radial stress acting on the shale formation contributing to borehole failure. A mathematical model has been developed for predicting the swelling behaviour of shale when placed in contact with water under moderate pressures and the effect of the swelling on borehole (in)stability. The model is based on thermodynamic theory which suggests that fluid movement into or out of a shale is driven by an imbalance in the partial molar free energy of the shale and the contacting fluid. Conversion of the free energy of each system (fluid and shale) into "total swelling pressure" made it possible to model transient pressures and strains generated in shale. The analytical solution of the radial diffusivity equation is reduced to a simpler form for the model. The model was validated using equipment and experimental techniques which allow continuous monitoring of shale swelling as function of time and distance from the wetting end. It was found that increasing the compaction stress acting on the shale reduced the rate of swelling, and increasing the hydraulic pressure of the fluid on the shale's wetted surface increased the rate of swelling. This behaviour was adequately described by the model which therefore represents a new method for predicting shale swelling as function of time and radial distance under different environments. Swelling strains are then used to predict related changes in shale mechanical properties (failure criteria) and well (in)stability. Several well-site index tests have been developed to study shale-drilling fluid interaction at wellsite. These index tests can provide input data for the mathematical model. Drilling fluids can be screened for their ability to control shale swelling, thus minimising the risk of well bore instability.

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Porkert, Sebastian. „Physico-Chemical Processes during Reactive Paper Sizing with Alkenyl Succinic Anhydride (ASA)“. Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-219620.

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Sizing (hydrophobization) is one of the most important process steps within the added-value chain of about 1/3rd of the worldwide produced paper & board products. Even though sizing with so-called reactive sizing agents, such as alkenyl succinic anhydride (ASA) was implemented in the paper industry decades ago, there is no total clarity yet about the detailed chemical and physical mechanisms that lead to their performance. Previous research was carried out on the role of different factors influencing the sizing performance, such as bonding between ASA and cellulose, ASA hydrolysis, size revision as well as the most important interactions with stock components, process parameters and additives during the paper making process. However, it was not yet possible to develop a holistic model for the explanation of the sizing performance given in real life application. This thesis describes a novel physico-chemical approach to this problem by including results from previous research and combining these with a wide field of own basic research and a newly developed method that allows tracing back the actual localization of ASA within the sheet structure. The carried out measurements and trial sets for the basic field of research served to evaluate the stock and process parameters that most dominantly influence the sizing performance of ASA. Interactions with additives other than retention aids were not taken into account. The results show that parameters, such as the content of secondary fibers, the degree of refining, the water hardness as well as the suspension conductivity, are of highest significance. The sample sets of the trials with the major impacting parameters were additionally analyzed by a newly developed localization method in order to better understand the main influencing factors. This method is based on optical localization of ASA within the sheet structure by confocal white light microscopy. In order to fulfill the requirements at magnification rates of factor 100 optical zoom, it was necessary to improve the contrast between ASA and cellulose. Therefore, ASA was pretreated with an inert red diazo dye, which does not have any impact on neither the sizing nor the handling properties of ASA. Laboratory hand sheets that were sized with dyed ASA, were analyzed by means of their sizing performance in correlation to measurable ASA agglomerations in the sheet structure. The sizing performance was measured by ultrasonic penetration analysis. The agglomeration behavior of ASA was analyzed automatically by multiple random imaging of a sample area of approx. 8650 µm² with a minimum resolution for particles of 500 nm in size. The gained results were interpreted by full factorial design of experiments (DOE). The trials were carried out with ASA dosages between 0% and 0.8% on laboratory hand sheets, made of 80% bleached eucalyptus short fiber kraft pulp and 20% northern bleached softwood kraft pulp, beaten to SR° 30, produced with a RDA sheet former at a base weight of 100 g/m² oven dry. The results show that there is a defined correlation between the ASA dosage, the sizing performance and the number and area of ASA agglomerates to be found in the sheet structure. It was also possible to show that the agglomeration behavior is highly influenced by external factors like furnish composition and process parameters. This enables a new approach to the explanation of sizing performance, by making it possible to not only examine the performance of the sizing agent, but to closely look at the predominant position where it is located in the sheet structure. These results lead to the explanation that the phenomenon of sizing is by far not a pure chemical process but rather a more physical one. Based on the gained findings it was possible so far to optimize the ASA sizing process in industrial-scale by means of ~ 50% less ASA consumption at a steady degree of sizing and improved physical sheet properties.

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Siegwein, Alexander Martin. „THE EFFECTS OF SOY PROTEIN ISOLATE ADDITION ON THE PHYSICO-CHEMICAL PROPERTIES OF GUMMI CONFECTIONS“. The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1276883276.

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Bücher zum Thema "Physico-chemical analyzes"

Hummel, Dieter O. Handbook of surfactant analysis: Chemical, physico-chemical, and physical methods. New York: John Wiley, 1999.

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Fresenius, Wilhelm. Water Analysis: A Practical Guide to Physico-Chemical, Chemical and Microbiological Water Examination and Quality Assurance. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988.

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Bentham, H. Habitat classification and soil restoration assessment using analysis of soil microbiological and physico-chemical characteristics. S.l: s.n, 1992.

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Pruszkowska-Caceres, Małgorzata. Analiza zmienności fizyczno-chemicznej słodkich wód podziemnych w strefie kontaktu z wodami słonymi: Na przykładzie rejonów nadmorskich i niecek endoreicznych = Analysis of the physico-chemical variability of fresh groundwater chemical composition in a contact zone with saltwater : on the example of coastal regions and closed basins. Gdańsk: Wydawnictwo Politechniki Gdańskiej, 2012.

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Majewska, Ewa. Studia nad wykorzystaniem wybranych parametrów fizyko-chemicznych i związków lotnych do określania autentyczności polskich miodów odmianowych: The studies on the use of selected physico-chemical parameters and volatile compounds to determine the authenticity of the Polish varietal honeys. Warszawa: Wydawnictwo SGGW, 2013.

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Physico-Chemical Analysis of Molten Electrolytes. Elsevier Science, 2006.

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Physico-Chemical Analysis of Molten Electrolytes. Elsevier, 2006. http://dx.doi.org/10.1016/b978-0-444-52116-3.x5000-4.

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Powell, Francis Evan. Physico-chemical studies in flow analysis. 1990.

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T, Beckett S., Hrsg. Physico-chemical aspects of food processing. London: Blackie Academic & Professional, 1995.

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Alena, Mudroch, Azcue José M und Mudroch Paul, Hrsg. Manual of physico-chemical analysis of aquatic sediments. Boca Raton, Fla: CRC Lewis, 1997.

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Buchteile zum Thema "Physico-chemical analyzes"

Trivedi, M. J., J. J. Trivedi und R. D. Sheth. „Physico-Chemical Analysis of Urinary Stones“. In Urolithiasis, 725–26. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4899-0873-5_225.

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Harrison, R. M. „Physico-chemical speciation techniques for atmospheric particles“. In Handbook of Air Pollution Analysis, 523–33. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4083-3_11.

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Kulkarni, V. V., P. S. Girish, S. B. Barbuddhe, B. M. Naveena und M. Muthukumar. „Sampling of Meat for Physico-Chemical Analysis“. In Analytical Techniques in Meat Science, 1–4. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003230892-1.

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Laurila, Tuomas. „Principal Component Analysis of Wet Deposition in Finland“. In Physico-Chemical Behaviour of Atmospheric Pollutants, 463–68. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0567-2_69.

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Facchini, M. C., G. Chiavari und S. Fuzzi. „Analysis of Carbonyl Compounds in the Atmospheric Liquid Phase“. In Physico-Chemical Behaviour of Atmospheric Pollutants, 188–97. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3841-0_20.

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Millán, Millán M., Marino Navazo und Agustin Ezcurra. „Meso-Meteorological Analysis of Air Pollution Cycles in Spain“. In Physico-Chemical Behaviour of Atmospheric Pollutants, 614–26. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3841-0_68.

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Schneider, Gerhard M. „Physico-chemical Principles of Supercritical Fluid Separation Processes“. In Analysis with Supercritical Fluids: Extraction and Chromatography, 9–31. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-77474-4_2.

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Mavlonov, Sh, und H. Shodiev. „Physico-Chemical Analysis Under Conditions of High Gravity“. In Processing by Centrifugation, 235–39. Boston, MA: Springer US, 2001. http://dx.doi.org/10.1007/978-1-4615-0687-4_31.

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Sahand, S., W. Speuser und U. Schurath. „A Battery-Powered Light-Weight Ozone Analyzer for Use in the Troposphere and Stratosphere“. In Physico-Chemical Behaviour of Atmospheric Pollutants, 33–44. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3841-0_5.

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Böhm, R., und G. W. Israël. „A New Analyzer for Sulfuric Acid and Sulfur Aerosols in Ambient Air: Development And Measurements“. In Physico-Chemical Behaviour of Atmospheric Pollutants, 145–51. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0567-2_23.

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Konferenzberichte zum Thema "Physico-chemical analyzes"

Ghinea, Cristina. „PHYSICO-CHEMICAL AND SENSORY ANALYZES OF MUFFINS OBTAINED WITH ALMOND FLOUR AND COCONUT OIL“. In 19th SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings. STEF92 Technology, 2019. http://dx.doi.org/10.5593/sgem2019v/6.3/s08.022.

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Smagulova, A. Sh. „Physico-chemical analysis of imported dietary supplements“. In XX Anniversary All-Russian Scientific and Practical Conference of Young Scientists, Postgraduates and Students. Technical Institute (BRANCH) of NEFU, 2019. http://dx.doi.org/10.18411/s-2019-77.

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Monesh, M., N. Karthik, Dilip Kumar, V. Bharath, Naveen Korishetti und N. Vidyavathi. „Physico chemical analysis of intrusions in Bellandur lake“. In PROCEEDINGS OF THE 35TH INTERNATIONAL CONFERENCE OF THE POLYMER PROCESSING SOCIETY (PPS-35). AIP Publishing, 2020. http://dx.doi.org/10.1063/1.5141552.

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Predoi, D., M. V. Predoi, Moncef Ech Cherif El Kettani, Damien Leduc, S. L. Iconaru, C. S. Ciobanu, N. Buton, C. C. Petre und A. M. Prodan. „Physico-chemical characteristics and antimicrobial studies of silver doped hydroxyapatite“. In INTERNATIONAL CONFERENCE ON STRUCTURAL ANALYSIS OF ADVANCED MATERIALS: ICSAAM 2017. Author(s), 2018. http://dx.doi.org/10.1063/1.5024184.

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Pantelic, Nebojša Đ., Jana S. Štrbacki, Goran Markovic und Jelena B. Popovic-Đorđevic. „SEASONAL VARIATIONS OF THE ZAPADNA MORAVA RIVER WATER QUALITY“. In XXVI savetovanje o biotehnologiji sa međunarodnim učešćem. University of Kragujevac, Faculty of Agronomy, 2021. http://dx.doi.org/10.46793/sbt26.357p.

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The water samples collected from four localities of the middle course of the Zapadna Morava River during 2020 were analyzed via the selected physico-chemical parameters with the aim to estimate the quality of surface water. According to the results of selected physico-chemical parameters (pH, conductivity, dissolved oxygen, chemical oxygen demand, biochemical oxygen demand), analyzed surface water show a good chemical status, while the values of nutrient content (nitrate, nitrite, ammonium ion, total phosphorus) indicated the poor chemical status especially at the locality 4 probably due to the outflow of wastewater from the city of Čačak as well as from the influence of the polluted water of the Čemernica River.

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Yu-Che Cheng, Ta-Te Lin, Chu-Yang Chou und Jyh-Horng Chen. „Physico-Chemical Analysis of Internal Bruise of Selected Fruits Using Chemical Shift Imaging“. In 2008 Providence, Rhode Island, June 29 - July 2, 2008. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2008. http://dx.doi.org/10.13031/2013.25010.

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Miu, Lucretia, Simona-Maria Paunescu, Maria-Cristina Micu, Iulia-Maria Caniola, Madalina Ignat, Claudiu Sendrea und Elena Badea. „Chemical and physico-mechanical characterizations of leather for restoration“. In The 8th International Conference on Advanced Materials and Systems. INCDTP - Leather and Footwear Research Institute (ICPI), Bucharest, Romania, 2020. http://dx.doi.org/10.24264/icams-2020.v.7.

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Leather is a complex material mostly consisting of a matrix of collagen, chemically stabilized by various tannins. This matrix, sooner or later undergoes alterations as a consequence of interactions between their structure and environment. A comprehensive study based on multiple chemical and physico-mechanical standard tests regarding leather samples which were artificially aged from 7 to 112 days has been made at 70°C. The behavior in artificial aging of calf leather samples tanned at pilot level with two different vegetal tannins, mimosa and quebracho, were investigated due to its’s similarity to the natural degradation of historical leather samples. Physico-mechanical characteristics of historical leather can be corelated with the high impact of degree of deterioration even though there are no standard regulations. To be able to choose the proper way to achieve compatibility with an appropriate material in the restoration-conservation process, multiple sample characteristic must be known. The condition of historical leather can be assessed by a series of simple visual and physical examinations which determine the flexibility, strength and coherency of the fibers and then correlate these assessments with the condition of leather as determined by various chemical and physical-chemical analyses. Therefore, the following chemical standard tests were made: volatile substances, shrinkage temperature, extractable substances, total soluble substances and the following physico-mechanical tests: tensile strength, elongation at breaking and tear resistance.

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Garcia-Olvera, Griselda, Teresa M. Reilly, Teresa E. Lehmann und Vladimir Alvarado. „Analysis of Physico-Chemical Constraints on Surfactant Blends for Offshore Reservoirs“. In Offshore Technology Conference. Offshore Technology Conference, 2016. http://dx.doi.org/10.4043/26929-ms.

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Yashchenko, I. G., und Y. M. Polishchuk. „Analysis of physico-chemical properties and territorial location of vanadium oils“. In PROCEEDINGS OF THE ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES. Author(s), 2018. http://dx.doi.org/10.1063/1.5083572.

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Stojic, Natasa, Mira Pucarevic, Milica Živkovic, Vesna Teofilovic und Dunja Prokic. „UTICAJ OTPADA NA FIZIČKO-HEMIJSKE KARAKTERISTIKE ZEMLJIŠTA“. In XXVI savetovanje o biotehnologiji sa međunarodnim učešćem. University of Kragujevac, Faculty of Agronomy, 2021. http://dx.doi.org/10.46793/sbt26.351s.

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Land exploitation directly affects the physico-chemical characteristics of the soil. Agricultural land can often be seen near the landfills. The question is how much waste affects the production potential of land. The research in this paper is focused on the influence of the municipal waste landfill on the physico-chemical characteristics of the soil. In soil samples were analyzed: pH in KCl, pH in H2O, CaCO3, humus, total nitrogen, P2O5, K2O and organic carbon. The obtained results indicate a negative impact of waste on the content of OC and the content of easily accessible phosphorus and potassium.

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