Relevant bibliographies by topics / Chemical aspects

Academic literature on the topic 'Chemical aspects'

Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

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

Select a source type:

Contents

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Chemical aspects.'

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

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

Journal articles on the topic "Chemical aspects"

1

Carpenter, K. J. "Chemical reaction engineering aspects of fine chemicals manufacture." Chemical Engineering Science 56, no. 2 (January 2001): 305–22. http://dx.doi.org/10.1016/s0009-2509(00)00231-1.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Mager, Humphrey I. X., and Shiao-Chun Tu. "CHEMICAL ASPECTS OF BIOLUMINESCENCE." Photochemistry and Photobiology 62, no. 4 (October 1995): 607–14. http://dx.doi.org/10.1111/j.1751-1097.1995.tb08707.x.

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

Butz, P., and B. Tauscher. "Emerging technologies: chemical aspects." Food Research International 35, no. 2-3 (January 2002): 279–84. http://dx.doi.org/10.1016/s0963-9969(01)00197-1.

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

O'Shea, Paul. "Aspects of chemical evolution." Endeavour 11, no. 1 (January 1987): 54. http://dx.doi.org/10.1016/0160-9327(87)90181-5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Mechoulam, Raphael, and Lumı́r Hanuš. "Cannabidiol: an overview of some chemical and pharmacological aspects. Part I: chemical aspects." Chemistry and Physics of Lipids 121, no. 1-2 (December 2002): 35–43. http://dx.doi.org/10.1016/s0009-3084(02)00144-5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Schmidt, R. "Chemical aspects of metrology in the chemical industry." Accreditation and Quality Assurance 6, no. 1 (January 9, 2001): 48–50. http://dx.doi.org/10.1007/s007690000249.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Chanda, Manas. "Chemical aspects of polymer recycling." Advanced Industrial and Engineering Polymer Research 4, no. 3 (July 2021): 133–50. http://dx.doi.org/10.1016/j.aiepr.2021.06.002.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Awasthi, DK, and Gyanendra Awasthi. "CHEMICAL ASPECTS OF ANTIANXIETY DRUGS." International Journal of Advanced Research 5, no. 6 (June 30, 2017): 540–49. http://dx.doi.org/10.21474/ijar01/4446.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Sigg, Laura, Renata Behra, Ksenia Groh, Carl Isaacson, Niksa Odzak, Flavio Piccapietra, Lena Röhder, Hannah Schug, Yang Yue, and Kristin Schirmer. "Chemical Aspects of Nanoparticle Ecotoxicology." CHIMIA International Journal for Chemistry 68, no. 11 (November 26, 2014): 806–11. http://dx.doi.org/10.2533/chimia.2014.806.

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

BLIX, GUNNAR, and IVAR WERNER. "Chemical Aspects on Connective Tissue." Acta Medica Scandinavica 154, S312 (April 24, 2009): 358–61. http://dx.doi.org/10.1111/j.0954-6820.1956.tb17012.x.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Chemical aspects"

1

Domijan, Mirela. "Mathematical aspects of chemical reaction networks." Thesis, University of Warwick, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.495019.

Full text
Abstract:
Chemical and biological processes present a challenge when it comes to modelling and analysis. The models usually have to take into account many chemicals and complex interactions and in turn, they are often described by large ODE systems with complicated nonlinear terms. If there is a lack of quantitative information about the chemical interactions, there will also be parameter uncertainty in the systems. Such systems present a challenge to analyse. In response, an increasing consensus calls for emphasis on the underlying chemical reaction network structure and the use of network information to predict possible system dynamics.
APA, Harvard, Vancouver, ISO, and other styles
2

Hale, Waverly Mitchell. "Surface chemical aspects of microbubble flotation." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45816.

Full text
Abstract:

In order to demonstrate the ability of microbubble flotation to superclean coal to ash levels of less than 2%, several Eastern U. S. coals have been tested. The results show that the process is capable of producing superclean coal with improved recovery as compared to the conventional flotation process.

To further improve and understand the microbubble flotation process, electrokinetic studies of the hydrocarbon oils used in flotation as collectors have been conducted. Also, the effect of oil emulsifiers on the zeta potential of oil droplets has been studied. In general, oil droplets are negatively charged and negative zeta potential is reduced with the addition of nonionic and cationic surfactants. On the other hand, the negative charge is increased with the addition of an anionic reagent. It has also been shown that the negative zeta potential of oil droplets increases with increasing hydrocarbon chain length.

The effects of different collectors on induction time and flotation have been determined by conducting microflotation and induction time experiments using an Elkhorn seam coal sample. The results show that industrial oils combined with the coal have the shortest induction times and, therefore, the highest flotation yields as compared to pure hydrocarbon oils. It has also been shown that oil emulsifiers tend to increase flotation yield and reduce particle/bubble induction time.


Master of Science

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

Kong, Kong Hang. "Chemical aspects of coagulation in water treatment." Thesis, University of Macau, 2000. http://umaclib3.umac.mo/record=b1445036.

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

Gopal, Tanuja Danie. "Colloidal aspects of chemical mechanical planarization (CMP) /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2004. http://wwwlib.umi.com/cr/ucsd/fullcit?p3138831.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Halliday, Colin George. "Aspects of photometric titration." Thesis, Queen's University Belfast, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329513.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Evmorfopoulos, Evangelos. "Chemical and biological aspects of mercury in seafoods." Thesis, Loughborough University, 1995. https://dspace.lboro.ac.uk/2134/27859.

Full text
Abstract:
Two open wet oxidation methods are described for the digestion of selected seafoods prior to total mercury determination using a cold vapour atomic absorption spectrophotometric technique. The first employs two acids (i.e. HNO3 and H2SO4) and two oxidants (i.e. KMnO4 and K2S2O8), and is suitable for use with a Perkin-Elmer Mercury Analysis System (MAS) and a Perkin-Elmer Mercury Analyzer 50A (MA). Excellent recoveries were obtained for mussel samples spiked with various quantities of inorganic mercury [Hg(N03)2]. For the optimum part of the calibration curve of the MAS (0.1–0.7 μg/ml Hg), the percentage recovery (%R) fluctuated between 98.26 and 101.98. The limit of detection (LOD) was calculated to be 18.7 ng of mercury per sample analysed and sensitivity of 0.011 μg of mercury was obtained. Results for fish samples determined with both units showed excellent agreement and precision (RSD = 3.23 -4.25). However, the MA was found inadequate for the determination of the low mercury levels encountered with the mussel samples. It was shown that a desiccant assembly must be installed whenever samples with low mercury content are analysed, i.e. less than 0.5 μg per sample digested.
APA, Harvard, Vancouver, ISO, and other styles
7

I'Anson, S. J. "Physical aspects of chemical injection damp-proof courses." Thesis, University of Manchester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373622.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Nascimento, Raimundo Regivaldo Gomes do. "Chemical aspects of the study Hamelia patens Jacq." Universidade Federal do CearÃ, 2010. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=11068.

Full text
Abstract:
FundaÃÃo Cearense de Apoio ao Desenvolvimento Cientifico e TecnolÃgico
This work describes the phytochemical investigation of Hamelia patens (Rubiaceae) native from Guaramiranga montain, CearÃ, Brazil. Sucessive chromatographic treatment of the ethanol extract of leaves led to the isolation of the pentaciclic oxindole alkaloids pteropodine, isopteropodine, palmirine, and the new isopalmirine, besides the flavonoid kaempferol l-3-α-O-rhamnopyranosyl-(1-6)-β-D-galactopyranoside. The study of the ethanol extract of the stems led to the isolation of the steroids β-sitosterol and stigmasterol as mixture, stigmast-4-en-3,6-dione, and the triterpene ursolic acid. The ethanol extract of the trunk yielded vanillic acid and the β-sitosterol and stigmasterol glucosilated. The isolation of the chemical constituents were performed by the use of chromatographic techniques, including flash cromatography, thin layer crohromatography, preparative crhomatography, and preparative high performance liquid chromatography (HPLC). The strucutral charactherization were performed by the use of infrared, mass spectrometry and nuclear magnetic resonance, including one (1H NMR, 13C NMR and DEPT 135) and two-bidimensional pulse sequences (HMBC, HSQC, COSY e NOESY), and comparison with literature data.
Neste trabalho foi realizado a investigaÃÃo fitoquÃmica de Hamelia patens (Rubiaceae) nativa da Serra de Guaramiranga-CE. A realizaÃÃo de sucessivos tratamentos cromatogrÃficos a partir do extrato etanÃlico das folhas possibilitou o isolamento dos alcalÃides oxindÃlicos pentacÃclicos pteropodina, isopteropodina e palmirina, jà citados na literatura para a espÃcie, do alcalÃide isopalmirina de carÃter inÃdito na literatura, alÃm do flavonÃide canferol-3-O-α-L-rhamnopiranosil-(1→6)-β-D-galactopiranosÃdeo. O estudo do extrato etanÃlico dos talos possibilitou o isolamento dos esterÃides β-sitosterol e estigmasterol como mistura, do estigmast-4-en-3,6-diona, alÃm do triterpeno Ãcido ursÃlico. A partir do extrato etanÃlico do caule foram obtidos o Ãcido vanÃlico e a mistura de esterÃides β-sitosterol e estigmasterol glicosilados. Para o isolamento dos metabÃlitos secundÃrios foram empregadas tÃcnicas cromatogrÃficas convencionais como cromatografia em camada delgada, cromatografia filtrante, cromatografia flash, cromatografia preparativa e Cromatografia LÃquida de Alta EficiÃncia (CLAE). A caracterizaÃÃo estrutural dos compostos isolados foi realizada atravÃs de tÃcnicas espectroscÃpicas como infravermelho, espectrometria de massas e ressonÃncia magnÃtica nuclear, incluindo tÃcnicas uni (RMN 1H e RMN 13C e DEPT 135) e bidimensionais (HMBC, HSQC, COSY e NOESY), alÃm de comparaÃÃo com dados descritos na literatura.
APA, Harvard, Vancouver, ISO, and other styles
9

Slater, Christine. "Physico-chemical aspects of aqueous gloss emulsion paints." Thesis, Loughborough University, 1987. https://dspace.lboro.ac.uk/2134/13747.

Full text
Abstract:
The formulation of an aqueous paint involves the mixing of a very complex chemical system. The objective of this study was to investigate the colloidal and surface properties of this type of system. From this an overall picture of the physico-chemical interactions occurring between the pigment and polymer, and the effect of the soluble components, could be obtained. By a greater appreciation of the basic chemistry of the paint system, improvements of the final commercial products cculd be possible. A simple paint system was designed which contained industrial pigment, poly(vinylacetate) polymer and soluble ccnstituents including sodium hexametaphosphate (dispersant), and sodium dodecylsulphate (emulsifier). A non ionic thickener, sodium hydroxyethylcellulose, and an ionic thickener, carboxymethyl cellulose was also included. The effect of the alumina coating was investigated by testing both alumina coated pigment, RTC90, uncoated ccnventional rutile, RD rutile and alumina pigment, Hydral. The effect of these soluble aluminium species on the pclymer was also demonstrated. The interaction of the soluble components on the polymer and pigment WoS investigated using microelectrophoresis and adsorption techniques. The distribution of mcbilities in colloidal samples was obtained for both coated and uncoated pigments in a variety of solutes. The effect of thickener concentration on paint formulations and millbases was measured at constant temperature in precision bore glass columns. The data was analysed using an interactive computer programme based on the work of Carstensen & Su (1970a 1970b). The effect of thickener with respect to flocculation, film formation and gloss was also estimated using optical and infrared techniques. This study has given an idea of the complexity of paint formulations and the need for further model studies on the individual components of the system.
APA, Harvard, Vancouver, ISO, and other styles
10

Loubser, Magdeleen. "Chemical and physical aspects of Lithium borate fusion." Diss., University of Pretoria, 2010. http://hdl.handle.net/2263/29114.

Full text
Abstract:
Fused glass beads as a sample preparation method for X-ray Fluorescence spectroscopy (XRF) were introduced in 1957 by Claisse; it soon became the preferred method to introduce oxide samples to the spectrometer, because heterogeneity, mineralogical and particle size effects are eliminated during the fusion process. Matrix effects are largely reduced by the resulting dilution. With the recent advances in XRF spectrometers, instruments with enhanced generator and temperature stability, improved sensitivity (even for light elements), and effective matrix correction software are available. Consequently, the largest proportion of analytical error results from the sample preparation step. Sampling error will always contribute the largest overall error but that is not the topic of this discussion. After more than 50 years of fused bead use in XRF analysis, certain matrices remain problematic. Although many fusion methods for chromite-, sulphide- and cassiterite-rich materials have been published, easily reproduced, routine methods for these still elude analytical chemists. Lengthy fusions at temperatures higher than 1100ºC are often prescribed for refractory materials and ores, and until recently one of the biggest challenges was a metal-bearing sample e.g. contained in slags or certain refractory materials. This study was conducted to identify and elucidate the reactions occurring in the formation of a lithium borate glass, but also between the lithium borate and oxides during glass formation. Different analytical techniques were used to investigate the reactions occurring during the fusion process based on theoretical glass-making principles. As a starting point, Thermo Gravimetric Analysis (TGA) and Differential Thermal Analysis (DTA) were used jointly to evaluate the reactions occurring during the fusion of lithium borate glasses, and at a later stage, oxide/flux mixtures. When a different TGA instrument was used, Differential Scanning Calorimetry (DSC) was used in conjunction with the TGA. Observed reactions were modelled in a muffle furnace to produce identical material in larger quantities, and this material was then investigated using X-ray Powder Diffractometry (XRD), Raman Spectroscopy and Electron Microprobe Analysis (EPMA). The most enlightening result from the TGA/DSC results was the large mass loss above 1050 ºC. Literature often prescribes prolonged fusions at elevated temperatures for certain fusions, but it was proved beyond reasonable doubt that this practise causes volatilisation of the flux and leads to erroneous analytical results. The next analytical technique applied to the flux and flux/oxide samples was XRD. Where pre-fused fluxes were investigated, the XRD data served as confirmation of the glassy state of the pre-fused flux as a broad humpy scan indicative of an amorphous material was seen in stead of a diffractogram with sharp, well defined peaks. After heating to above the temperature of re-crystallisation, the phases present could be identified from the diffractogram. Provisional results using the in-situ, high temperature stage point towards the possibility of using this technique to great effect to investigate the presence of different phases formed at high temperatures. Flux-oxide mixtures were measured on the high temperature stage and after cooling a new phase was observed indicating that new phases formed during a fusion reaction. As the heating stage is slow-cooled, the chance of crystallisation in the glass is good, providing the possibility for investigating this formation of new phases at elevated temperatures further with a more suitable heating element that will contain the material. Raman spectroscopy was subsequently used to gain information about the bonds within the flux. Pure lithium tetraborate and lithium metaborate fluxes were analysed as well as flux oxide mixtures. The vibrations could not be predicted from first principles as band broadening occurs in glasses that makes theoretical predictions very difficult. The data obtained was compared to similar studies in literature and good agreement was found. In oxide-flux mixtures definite new bands were observed that was not part of the flux or oxide spectrum. EPMA results allowed calculation of the maximum solubilities of an oxide in a specific flux. It was done using Cr2O3 and ZrO2 and compared well with experimental values obtained from literature. The microscope images revealed some new insights into the theory of XRF fusions. It could clearly be seen that dissociation of the minerals in the sample occurred, thus proving that no mineralogical effects exist in a fused glass bead, and it could be observed that the flux oxide mixture devitrify when over saturated.
Dissertation (MSc)--University of Pretoria, 2010.
Chemistry
unrestricted
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Chemical aspects"

1

Mann, J. Chemical aspects of biosynthesis. Oxford: Oxford University Press, 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Mann, J. Chemical aspects of biosynthesis. Oxford: Oxford University Press, 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Field, Robert W. Chemical engineering: Introductory aspects. Basingstoke: Macmillan Education, 1988.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Chemical aspects of biosynthesis. Oxford: Oxford University Press, 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Alejandro, Toro-Labbé, ed. Theoretical aspects of chemical reactivity. Amsterdam: Elsevier, 2007.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

W, Hoyle, Karsa D. R. 1943-, and Royal Society of Chemistry (Great Britain). Information Services., eds. Chemical aspects of plastics recycling. Cambridge: Royal Society of Chemistry, Information Services, 1997.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Baldwin, Thomas O., Frank M. Raushel, and A. Ian Scott, eds. Chemical Aspects of Enzyme Biotechnology. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4757-9637-7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Ochowiak, Marek, Szymon Woziwodzki, Michał Doligalski, and Piotr Tomasz Mitkowski, eds. Practical Aspects of Chemical Engineering. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73978-6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Ochowiak, Marek, Szymon Woziwodzki, Piotr Tomasz Mitkowski, and Michał Doligalski, eds. Practical Aspects of Chemical Engineering. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-39867-5.

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

Chemical aspects of photodynamic therapy. Amsterdam, The Netherlands: Gordon and Breach Science Publishers, 2000.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Chemical aspects"

1

Janata, Jiří. "General Aspects." In Principles of Chemical Sensors, 1–37. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4757-6257-0_1.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Goldman, Alex. "Chemical Aspects of Ferrites." In Handbook of Modern Ferromagnetic Materials, 229–64. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4917-8_12.

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

Birch, Gordon G. "Chemical Aspects of Sweetness." In Sweetness, 3–13. London: Springer London, 1987. http://dx.doi.org/10.1007/978-1-4471-1429-1_1.

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

Falk, Heinz. "Historical Aspects." In Monatshefte für Chemie/Chemical Monthly Supplementa, 40–59. Vienna: Springer Vienna, 1989. http://dx.doi.org/10.1007/978-3-7091-6938-4_4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Wilbourn, Julian, and Harri Vainio. "Identification of Carcinogenic Risks - Qualitative Aspects." In Chemical Safety, 241–58. Weinheim, Germany: VCH Verlagsgesellschaft mbH, 2007. http://dx.doi.org/10.1002/9783527616039.ch16.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Konradsson, Peter. "Mechanistic Aspects." In Glycoscience: Chemistry and Chemical Biology I–III, 535–49. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-56874-9_16.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Nishimura, Shin-ichiro. "General Aspects." In Glycoscience: Chemistry and Chemical Biology I–III, 1993–2004. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-56874-9_47.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Balescu, R., and P. Résibois. "Aspects of Kinetic Theory." In Advances in Chemical Physics, 173–91. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470142578.ch4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Pacault, A., J. Hoarau, and A. Marchand. "Aspects Récents DU Diamagnétisme." In Advances in Chemical Physics, 171–238. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470143490.ch5.

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

Tachibana, Akitomo. "Chemical Ideas of QED." In New Aspects of Quantum Electrodynamics, 95–142. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3132-8_3.

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

Conference papers on the topic "Chemical aspects"

1

Shapar, Raisa, and Olena Husarova. "Technological aspects of obtaining dried pectin-containing products." In Chemical technology and engineering. Lviv Polytechnic National University, 2019. http://dx.doi.org/10.23939/cte2019.01.081.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Kichura, Dariya. "Technological aspects of the production of functionalized hydrocarbon oligomers." In Chemical technology and engineering. Lviv Polytechnic National University, 2019. http://dx.doi.org/10.23939/cte2019.01.145.

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

Klinskaya, N., V. Jilyaev, and A. Pankratov. "Physico-Chemical Aspects of Plasma Spray Coatings." In ITSC 1998, edited by Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p0747.

Full text
Abstract:
Abstract The results of an investigation into compound, structure and some properties of composite plasma coatings based on stellite with an addition of titanium nitride are presented. It is shown that the coating formed in a gas-air plasma is characterized by better wear resistance and resistance to scaling. The results of industrial test lend support to wide use of such coatings in machine parts and units that work under the simultaneous influence of impact, abrasive wear and high temperature.
APA, Harvard, Vancouver, ISO, and other styles
4

Boardman, Larry D., Carl R. Kessel, and Steven J. Rhyner. "Chemical aspects of silicon-containing bilayer resists." In Microlithography '99, edited by Will Conley. SPIE, 1999. http://dx.doi.org/10.1117/12.350239.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Osipov, Andrey Valerievich, Mikhail Yurievich Bondar, Andrey Andreevich Groman, Olga Vadimovna Chebysheva, Sergei Vasilievich Milchakov, and Anatoliy Sergeevich Kosikhin. "Thermal Aspects for Chemical EOR Projects Implementation." In ADIPEC. SPE, 2022. http://dx.doi.org/10.2118/211455-ms.

Full text
Abstract:
Abstract Chemical methods of enhanced oil recovery in general and SP flooding, in particular, are considered as a promising tertiary method of developing mature oil fields in Western Siberia, with the potential to increase oil recovery to 60-70% of the initial geological reserves [1–3]. The selection of an effective mixture of surfactants and polymer for SP flooding is a complex and multi-stage process. Usually, the choice of chemical composition and modeling on the hydrodynamic model is carried out under isothermal condition at reservoir temperature [4,5,6]. However, recently some authors have been paying attention to the temperature aspects of SP flooding [7]. According to these studies, the change in reservoir temperature as a result of long-term injection of unheated water can play a decisive role in the choice of chemical composition and hydrodynamic simulate of SP flooding. This happens, firstly, due to the fact that the temperature significantly affects the IFT, on which the oil displacement coefficient of the SP composition depends. Secondly, the viscosity of the polymer solution and, consequently, the sweeping efficiency during SP flooding depends on the temperature. In this paper, the temperature profile was evaluated in the area of the SP flooding pilot site, where flooding with unheated water was carried out for 12 years. Initially, the downhole temperature in the injection well was calculated based on analytical functions, which was then confirmed by field studies. As it turned out, the downhole temperature in the injection well is 42 °C, which is 45 °C less than the initial reservoir temperature. At the second stage, with the help of analytical functions and hydrodynamic simulation, the temperature profile in the area of the SP flooding pilot site was estimated. Calculations have shown that the injection of unheated water over a 12-year period significantly cooled the reservoir in the pilot area. The temperature in the area of the well designed for injection of the SP composition is 70 °C, which is 17 °C less than the initial reservoir temperature and with further injection of the unheated SP composition, the temperature in the area of this well will fall. This circumstance must be taken into account when choosing surfactants and polymers that must have effective oil-displacing properties over a wide temperature range.
APA, Harvard, Vancouver, ISO, and other styles
6

Brinner, Thomas R., and Robert A. Durham. "Transient voltage aspects of grounding." In 2008 IEEE Petroleum and Chemical Industry Technical Conference (PCIC 2008). IEEE, 2008. http://dx.doi.org/10.1109/pcicon.2008.4663969.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Paraszczak, J., E. Babich, J. Heidenreich, R. McGouey, L. Ferreiro, N. Chou, and M. Hatzakis. "Chemical And Physical Aspects Of Multilayer Resist Processing." In 1988 Microlithography Conferences, edited by Scott A. MacDonald. SPIE, 1988. http://dx.doi.org/10.1117/12.968325.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Gehoel-van Ansem, Wendy F., Frank T. Linskens, and Vinh P. Pham. "Chemical and processing aspects of thin imaging layers." In Microlithography '99, edited by Will Conley. SPIE, 1999. http://dx.doi.org/10.1117/12.350272.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Madden, Timothy J. "Aspects of 3D chemical oxygen-iodine laser simulation." In SPIE Proceedings, edited by Krzysztof M. Abramski, Edward F. Plinski, and Wieslaw Wolinski. SPIE, 2003. http://dx.doi.org/10.1117/12.515583.

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

"Focus on Atrium Spaces Aspects on the Energy Performance." In International Institute of Chemical, Biological & Environmental Engineering. International Institute of Chemical, Biological & Environmental Engineering, 2015. http://dx.doi.org/10.15242/iicbe.c0615071.

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

Reports on the topic "Chemical aspects"

1

Sidell, Frederick R., Ernest T. Takafuji, and David R. Franz. Medical Aspects of Chemical and Biological Warfare. Fort Belvoir, VA: Defense Technical Information Center, January 1997. http://dx.doi.org/10.21236/ada398241.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Langhoff, P. W., J. Boatz, and J. Sheehy. Spectral Theory of Physical and Chemical Binding: Aspects of Computational Implementation. Fort Belvoir, VA: Defense Technical Information Center, February 1998. http://dx.doi.org/10.21236/ada397877.

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

Schulberg, M. T., M. D. Allendorf, and D. A. Outka. Aspects of nitrogen surface chemistry relevant to TiN chemical vapor deposition. Office of Scientific and Technical Information (OSTI), August 1996. http://dx.doi.org/10.2172/415355.

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

Allen, P., and E. Sylwester. Chemical aspects of actinides in the geosphere: towards a rational nuclear materials management. Office of Scientific and Technical Information (OSTI), February 2001. http://dx.doi.org/10.2172/15005560.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Hwu, Jih-Ru, and Dave Winkler. FACS in the 21st century. AsiaChem Magazine, November 2020. http://dx.doi.org/10.51167/acm00002.

Full text
Abstract:
FACS is ideally positioned to be a powerful, inclusive, an outward-facing federation of chemical and allied societies in the Asia Pacific region. The Federation promotes networking and collaboration within the region and strong engagement in the broader international chemical community. Over the past three years, FACS has been refocused to capture these opportunities by the restructuring of three critical aspects of the FACS operations.
APA, Harvard, Vancouver, ISO, and other styles
6

Asenath-Smith, Emily, Emma Ambrogi, Lee Moores, Stephen Newman, and Jonathon Brame. Leveraging chemical actinometry and optical radiometry to reduce uncertainty in photochemical research. Engineer Research and Development Center (U.S.), September 2021. http://dx.doi.org/10.21079/11681/42080.

Full text
Abstract:
Subtle aspects of illumination sources and their characterization methods can introduce significant uncertainty into the data gathered from light-activated experiments, limiting their reproducibility and technology transition. Degradation kinetics of methyl orange (MO) and carbamazepine (CM) under illumination with TiO₂ were used as a case study for investigating the role of incident photon flux on photocatalytic degradation rates. Valerophenone and ferrioxalate actinometry were paired with optical radiometry in three different illumination systems: xenon arc (XE), tungsten halogen (W-H), and UV fluorescent (UV-F). Degradation rate constants for MO and CM varied similarly among the three light systems as k W-H < kiv-F < kXE, implying the same relative photon flux emission by each light. However, the apparent relative photon flux emitted by the different lights varied depending on the light characterization method. This discrepancy is shown to be caused by the spectral distribution present in light emission profiles, as well as absorption behavior of chemical actinometers and optical sensors. Data and calculations for the determination of photon flux from chemical and calibrated optical light characterization is presented, allowing us to interpret photo-degradation rate constants as a function of incident photon flux. This approach enabled the derivation of a calibrated ‘rate-flux’ metric for evaluating and translating data from photocatalysis studies.
APA, Harvard, Vancouver, ISO, and other styles
7

Waganet, R. J., John Duxbury, Uri Mingelgrin, John Hutson, and Zev Gerstl. Consequences of Nonequilibrium Pesticide Fate Processes on Probability of Leaching from Agricultural Lands. United States Department of Agriculture, January 1994. http://dx.doi.org/10.32747/1994.7568769.bard.

Full text
Abstract:
Pesticide leaching in heterogeneous field soils is relatively unstudied and is the focus of this project. A wide variety of heterogeneous soils exist, characterized by processes that result from the presence of structural cracks, worm holes, and other preferred pathways within which the majority of transport can occur (called physical non-equilibrium processes), along with the presence of sorption processes that are both equilibrium and kinetic (chemical non-equilibrium processes). Previous studies of pesticide leaching have focused primarily on relatively homogeneous soils, which are less widely distributed in nature, but more studied due to the relative ease with which quantitative theory can be applied to interpret experimental results. The objectives of the proposed project were: first, to gain greater insight into the basic physical and chemical processes that characterize non-equilibrium systems, second, to improve our ability to predict pesticide leaching in heterogeneous field soils, and third, to estimate the consequences of non-equilibrium processes at the field scale by conducting an analysis of the probability of pesticide leaching when non-equilibrium processes prevail. The laboratory, theoretical and modelling aspects of the project were successful; the field aspects less so. We gained greater insight into basic processes in heterogeneous field soils, and we improved and tested tools (simulation models) and the methodology of using such tools for assessing the probability of pesticide leaching as a contribution to broader risk analysis efforts.
APA, Harvard, Vancouver, ISO, and other styles
8

Wallach, Rony, Tammo Steenhuis, Ellen R. Graber, David DiCarlo, and Yves Parlange. Unstable Flow in Repellent and Sub-critically Repellent Soils: Theory and Management Implications. United States Department of Agriculture, November 2012. http://dx.doi.org/10.32747/2012.7592643.bard.

Full text
Abstract:
Water repellency causes unstable wetting fronts that result in water moving in preferential flowpaths through homogeneous soils as well in structured soils where macropores enhance the preferential flow pattern. Water repellency is typically associated with extended water ponding on the soil surface, but we have found that repellency is important even before the water ponds. Preferential flow fingers can form under conditions where the contact angle is less than 90o, but greater than 0o. This means that even when the soil is considered wettable (i.e., immediate penetration of water), water distribution in the soil profile can be significantly non-uniform. Our work concentrated on various aspects of this subject, with an emphasis on visualizing water and colloid flow in soil, characterizing mathematically the important processes that affect water distribution, and defining the chemical components that are important for determining contact angle. Five papers have been published to date from this research, and there are a number of papers in various stages of preparation.
APA, Harvard, Vancouver, ISO, and other styles
9

Lindow, Steven, Isaac Barash, and Shulamit Manulis. Relationship of Genes Conferring Epiphytic Fitness and Internal Multiplication in Plants in Erwinia herbicola. United States Department of Agriculture, July 2000. http://dx.doi.org/10.32747/2000.7573065.bard.

Full text
Abstract:
Most bacterial plant pathogens colonize the surface of healthy plants as epiphytes before colonizing internally and initiating disease. The epiphytic phase of these pathogens is thus an important aspect of their epidemiology and a stage at which chemical and biological control is aimed. However, little is known of the genes and phenotypes that contribute to the ability of bacteria to grow on leaves and survive the variable physical environment in this habitat. In addition, while genes such as hrp awr and others which confer pathogenicity and in planta growth ability have been described, their contribution to other aspects of bacterial epidemiology such as epiphytic fitness have not been addressed. We hypothesized that bacterial genes conferring virulence or pathogenicity to plants also contribute to the epiphytic fitness of these bacteria and that many of these genes are preferentially located on plasmids. We addressed these hypotheses by independently identifying genes that contribute to epiphytic fitness, in planta growth, virulence and pathogenicity in the phytopathogenic bacterium Erwinia herbicola pv gypsophilae which causes gall formation on gypsophila. This species is highly epiphytically fit and has acquired a plasmid (pPATH) that contains numerous pathogenicity and virulence determinants, which we have found to also contribute to epiphytic fitness. We performed saturation transposon mutagenesis on pPATH as well as of the chromosome of E.h. gypsophilae, and identified mutants with reduced ability to grow in plants and/or cause disease symptoms, and through a novel competition assay, identified mutants less able to grow or survive on leaves. The number and identity of plasmid-borne hrp genes required for virulence was determined from an analysis of pPATH mutants, and the functional role of these genes in virulence was demonstrated. Likewise, other pPATH-encoded genes involved in IAA and cytokinin biosynthesis were characterized and their pattern of transcriptional activity was determined in planta. In both cases these genes involved in virulence were found to be induced in plant apoplasts. About half of avirulent mutants in pPATH were also epiphytically unfit whereas only about 10% of chromosomal mutants that were avirulent also had reduced epiphytic fitness. About 18% of random mutants in pPATH were avirulent in contrast to only 2.5% of random chromosomal mutants. Importantly, as many as 28% of pPATH mutants had lower epiphytic fitness while only about 10% of random chromosomal mutants had lower epiphytic fitness. These results support both of our original hypotheses, and indicate that genes important in a variety of interactions with plant have been enriched on mobile plasmids such as pPATH. The results also suggest that the ability of bacteria to colonize the surface of plants and to initiate infections in the interior of plants involves many of the same traits. These traits also appear to be under strong regulatory control, being expressed in response to the plant environment in many cases. It may be possible to alter the pattern of expression of such genes by altering the chemical environment of plants either by genetic means or by additional or chemical antagonists of the plant signals. The many novel bacterial genes identified in this study that are involved in plant interactions should be useful in further understanding of bacterial plant interactions.
APA, Harvard, Vancouver, ISO, and other styles
10

Hackett, Wesley, Michael Raviv, Anath Das, Oded Reuveni, and Arie Gutman. Detecting Activity of Juvenile Phase-Specific Translocatable Substances that Influence Rooting Potential Using In Vitro Rooting Assays and Expression of a Specific Gene. United States Department of Agriculture, April 1998. http://dx.doi.org/10.32747/1998.7613038.bard.

Full text
Abstract:
The objectives of the project for which substantial effort was put forth were to: 1) Verify the relationship between expression of a cDNA clone (HW103) and the rooting potential of reciprocally grafted cuttings of juvenile and mature lamina and petioles of Hedera helix L. 2) Detect rooting promoter fractions in exudates from the juvenile leaves of H. Helix by assaying for rooting with leaf petioles of juvenile and mature plants. 3) Isolate, purify and identify compounds which show activity in assays for rooting potential. Some objectives or aspects of the objectives of the original proposal were not pursued for the reasons put forth in the body of the report. The most significant findings of the project are: 1) The MS medium is a better medium than Romberg medium for performing the leaf petiole rooting assay. 2) HW103 gene expression is cell-type specific with higher levels of expression in mature than juvenile phase H. Helix petioles as evidenced by in situ hybridization which suggests a negative relationship between HW103 expression in specific cells involved in root initiation and the lack of rooting potential in mature petioles 3) HW103 gene expression may be lower in mature petioles which had been grafter to a juvenile H. Helix lamina than mature petioles that had been grafted to a mature lamina and this putative lower expression is related to formation of a higher number of roots. 4) HW103 gene expression is not related to auxin induced ethylene production. 5) Two distinct compounds that possess root initiation promoting activity can be detected mainly in diffusate of juvenile H. Helix leaves using mung bean hypocotyls and H. Helix leaf petioles in vitro. 6) H. Helix diffusate active fractions do not insistenlty promote rooting in avocado mini-cuttings. 7) Chemical identification of the active rooting compounds was not accomplished because of the death of Prof. Becker, one of the collaborators, and the resultant loss of his data. These results indicate that these may be a molecular basis for reduced rooting potential in mature H. Helix petioles and that there are diffusible (translocatable) compounds in juvenile H. Helix leaves which promote rooting in juvenile and mature H. Helix petioles and mung bean hypocotyls.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Chemical aspects' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography