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Journal articles on the topic 'Helgeson'

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Published: 4 June 2021

Last updated: 8 February 2022

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1

Springer, Ronald D., Peiming Wang, and Andrzej Anderko. "Modeling the Properties of H2S/CO2/Salt/Water Systems in Wide Ranges of Temperature and Pressure." SPE Journal 20, no. 05 (October 20, 2015): 1120–34. http://dx.doi.org/10.2118/173902-pa.

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Summary To address the need to predict the properties of fluids in severe environments in the oil and gas industry, a comprehensive thermodynamic model has been developed for mixtures containing hydrogen sulfide (H2S), carbon dioxide (CO2), H2O, and selected salts. The model is based on the previously developed mixed-solvent electrolyte framework, which combines an equation of state for standard-state properties of individual species, an excess-Gibbs-energy model, and an algorithm for solving phase and chemical equilibria in multiphase systems. The standard-state properties are calculated from the Helgeson-Kirkham-Flowers (Helgeson et al. 1974a, 1974b, 1976, 1981; Tanger and Helgeson 1988) equation, whereas the excess Gibbs energy is expressed as a sum of a long-range electrostatic-interaction term expressed by a Pitzer-Debye-Hückel equation (Pitzer 1980), a virial coefficient-type term for interactions between ions, and a short-range term for interactions involving neutral molecules. The model has been parameterized using critically evaluated phase equilibrium data for various binary and ternary subsystems of the H2S/CO2/H2O/Na/Ca/Cl system and has been validated for temperatures ranging from 0 to 300°C, pressures up to approximately 3,500 atm, and salt concentrations up to solid saturation. The model reproduces chemical speciation in acid gas/brine systems as exemplified by the accurate prediction of pH. Because of its capability of predicting pH and activities of solution species, the model can serve as a foundation for studying metal/environment interactions in severe oil and gas environments.

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2

McKinney, Frank. "The Downy Waterfowl of North America Colleen Helgeson Nelson." Auk 112, no. 2 (April 1995): 525. http://dx.doi.org/10.2307/4088749.

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3

Shock, Everett L., and Jan P. Amend. "A tribute to Hal Helgeson on his 70th birthday." Geochimica et Cosmochimica Acta 65, no. 21 (November 2001): 3613. http://dx.doi.org/10.1016/s0016-7037(01)00795-5.

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4

Jacobs, Ingo, and Wolfgang Scholl. "Übersetzung und Validierung der Skala zur Erfassung übermäßiger Communion von Helgeson und Fritz." Diagnostica 53, no. 2 (April 2007): 57–67. http://dx.doi.org/10.1026/0012-1924.53.2.57.

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Zusammenfassung. Übermäßige Communion (UC) ist durch Überinvolvierung in die Probleme anderer Menschen und Vernachlässigung eigener Bedürfnisse zu Gunsten der Bedürfnisse anderer gekennzeichnet. In der vorliegenden Arbeit wurde die UC-Skala von Helgeson und Fritz (1998) ins Deutsche übertragen und in drei Studien validiert. Die deutsche UC-Skala war zur Originalskala konvergent und vergleichbar konsistent, jedoch faktoriell komplexer. In der interpersonalen Konstruktanalyse wurde die vorherrschende thematische Qualität der UC-Skala im interpersonalen Eigenschafts- und Problem-Circumplex als submissiv-freundlich ausgewiesen. Überinvolvierung in die Probleme anderer und Vernachlässigung eigener Bedürfnisse ließen sich auf Item-Ebene im interpersonalen Eigenschafts-Circumplex differenzieren. Das Fünf-Faktoren-Modell klärte 22% der UC-Skalenvarianz auf und hing differenziell mit Überinvolvierung und Vernachlässigung eigener Bedürfnisse zusammen.

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5

Airoldi, Martina. "James Helgeson, The lying mirror. The first-person stance and sixteenth-century writings." Studi Francesi, no. 170 (LVII | II) (July 1, 2013): 349–440. http://dx.doi.org/10.4000/studifrancesi.3039.

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6

Monaghan, Maureen. "Early Adolescent Predictors of Health in Emerging Adulthood: a Comment on Helgeson et al." Annals of Behavioral Medicine 47, no. 3 (November 20, 2013): 255–56. http://dx.doi.org/10.1007/s12160-013-9564-9.

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7

Hakin, Andrew W., and Gavin R. Hedwig. "Comment on the response by Jan P. Amend and Harold C. Helgeson (with editor's note)." Biophysical Chemistry 89, no. 2-3 (February 2001): 269. http://dx.doi.org/10.1016/s0301-4622(00)00231-3.

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8

Hakin, Andrew W., Lori L. Groft, Jocelyn L. Marty, and Matthew L. Rushfeldt. "Modeling of transfer properties using revised HKF theory: thermodynamics of transfer of an amino acid and small peptides from water to urea–water solutions at 298.15 K." Canadian Journal of Chemistry 75, no. 4 (April 1, 1997): 456–64. http://dx.doi.org/10.1139/v97-052.

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Relative densities, [Formula: see text] and heat capacity ratios, [Formula: see text] have been measured for aqueous solutions of glycine, glycylglycine, and glycylglycylglycine in aqueous urea solutions containing 1–13 mol kg−1 urea. These data have been used to calculate apparent molar volumes, [Formula: see text] and apparent molar heat capacities, [Formula: see text] which in turn have been used to obtain standard state volumes, [Formula: see text] and standard state heat capacities, [Formula: see text].Volumes and heat capacities of transfer from water to urea have been calculated from our reported standard state data. Heat capacities of transfer of the investigated systems have been modeled using a procedure developed from the semiempirical calculation procedures proposed by Helgeson, Kirkham, and Flowers. Keywords: amino acids, peptides, calorimetry, transfer thermodynamics, HKF theory.

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9

Plyasunov, Andrey V., and Everett L. Shock. "Correlation strategy for determining the parameters of the revised Helgeson-Kirkham-Flowers model for aqueous nonelectrolytes." Geochimica et Cosmochimica Acta 65, no. 21 (November 2001): 3879–900. http://dx.doi.org/10.1016/s0016-7037(01)00678-0.

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10

Barta, Leslie, and Loren G. Hepler. "Densities and apparent molar volumes of aqueous aluminum chloride. Analysis of apparent molar volumes and heat capacities of aqueous aluminum salts in terms of the Pitzer and Helgeson theoretical models." Canadian Journal of Chemistry 64, no. 2 (February 1, 1986): 353–59. http://dx.doi.org/10.1139/v86-058.

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Densities of aqueous solutions of AlCl3 (containing dilute HCl) have been measured at 10, 25, 40, and 55 °C with results that have led to defined apparent molar volumes. We have used the Pitzer ion interaction model as the basis for analyzing these apparent molar volumes to obtain standard state (infinite dilution) partial molar volumes of AlCl3(aq) at each temperature. We have also made similar use of apparent molar heat capacities of aqueous solutions of AlCl3–HCl and Al(NO3)3–HNO3 from Hovey and Tremaine to obtain standard state partial molar heat capacities of AlCl3(aq) and Al(NO3)3(aq) at these same temperatures. Finally, the standard state partial molar volumes and heat capacities have been used with the Helgeson–Kirkham semi-theoretical equation of state for aqueous ions to provide a basis for estimating the thermodynamic properties of Al3+(aq) at high temperatures and pressures.

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11

Duke, Michelle M., Andrew W. Hakin, Robert M. McKay, and Kathryn E. Preuss. "The volumetric and thermochemical properties of aqueous solutions of L-valine, L-leucine, and L-isoleucine at 288.15, 298.15, 313.15, and 328.15 K." Canadian Journal of Chemistry 72, no. 6 (June 1, 1994): 1489–94. http://dx.doi.org/10.1139/v94-185.

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Densities and volumetric heat capacities have been measured for aqueous solutions of L-valine, L-leucine, and L-isoleucine at 288.15, 298.15, 313.15, and 328.15 K. These data have been used to calculate apparent molar volumes, [Formula: see text] and apparent molar heat capacities, [Formula: see text] which in turn have been used to obtain standard state volumes, [Formula: see text] and standard state heat capacities, [Formula: see text] for each aqueous amino acid system. Helgeson, Kirkham, and Flowers equations, for neutral organics in water, have been used to model the calculated standard state volumes and heat capacities of the amino acids as a function of temperature at constant pressure. The results of our fitting procedures may be used to predict the behaviour of [Formula: see text] and [Formula: see text] for the selected amino acid systems outside of the temperature range utilised in this investigation.

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12

Eriksson, Gunnar, and Erich Königsberger. "FactSage and ChemApp: Two tools for the prediction of multiphase chemical equilibria in solutions." Pure and Applied Chemistry 80, no. 6 (January 1, 2008): 1293–302. http://dx.doi.org/10.1351/pac200880061293.

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The integrated thermochemical databank system FactSage enables the user to calculate equilibria and thermodynamic properties for a wide variety of multicomponent, multiphase systems and reactions. The Gibbs energy models and databases for condensed, gaseous, and aqueous solutions presently implemented in FactSage are of interest to chemical and physical metallurgy, chemical and corrosion engineering, inorganic and solution chemistry, geochemistry, environmental science, etc. Models for the aqueous phase include the Pitzer and Helgeson formalisms, but data and subroutines for concentrated aqueous solutions have also been provided by OLI Systems. ChemApp is a programmer's library for thermochemistry that also incorporates the Gibbs energy minimizer of FactSage. Applications of ChemApp include, for example, the handling of repetitive complex equilibrium calculations in application-specific programs and its linking to third-party process simulation packages. In this work, user-defined aqueous solution models in FactSage and ChemApp have been applied to the hydrometallurgical processing of aluminum ores in both caustic and acidic leach solutions.

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13

Kasvio, Antti. "Book Reviews : Bo Helgeson: Arbete, teknik, kapital. Förståelseformer inom modern industri sociologi. Högskolan i Luleo/Skeptron, Luleå 1986." Acta Sociologica 30, no. 1 (January 1987): 121–23. http://dx.doi.org/10.1177/000169938703000112.

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14

Bakker, Ronald J. "Adaptation of the Bowers and Helgeson (1983) equation of state to the H2O–CO2–CH4–N2–NaCl system." Chemical Geology 154, no. 1-4 (February 1999): 225–36. http://dx.doi.org/10.1016/s0009-2541(98)00133-8.

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15

Hakin, Andrew W., Michelle M. Duke, Sheri A. Klassen, Robert M. McKay, and Kathryn E. Preuss. "Apparent molar heat capacities and volumes of some aqueous solutions of aliphatic amino acids at 288.15, 298.15, 313.15, and 328.15 K." Canadian Journal of Chemistry 72, no. 2 (February 1, 1994): 362–68. http://dx.doi.org/10.1139/v94-056.

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The thermodynamics of amino acid systems are key to the understanding of protein chemistry. We have found that many previous studies of the apparent molar volumes and heat capacities of aqueous solutions of amino acids were conducted at the standard temperature of 298.15 K. This does not allow for the fact that most biological processes occur at temperatures removed from this standard condition.In an attempt to address this imbalance we have measured densities and heat capacities for aqueous solutions of glycine, L-alanine, L-serine, and L-threonine at 288.15, 298.15, 313.15, and 328.15 K using a Picker flow microcalorimeter. Apparent molar volumes and heat capacities, and the associated standard state partial molar properties have been calculated. Constant pressure variations of revised Helgeson, Kirkham, and Flowers equations have been fitted to calculated standard state volumes and heat capacities over the temperature range 288.15 to 328.15 K. These equations may be used to estimate standard state volumes and heat capacities, and hence equilibrium constants, for aqueous amino acid systems at higher temperatures.

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16

Gin, Stéphane, Christophe Jégou, Pierre Frugier, and Yves Minet. "Theoretical consideration on the application of the Aagaard–Helgeson rate law to the dissolution of silicate minerals and glasses." Chemical Geology 255, no. 1-2 (September 2008): 14–24. http://dx.doi.org/10.1016/j.chemgeo.2008.05.004.

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17

Zhao, Renhai, and Pujing Pan. "A spectrophotometric study of Fe(II)-chloride complexes in aqueous solutions from 10 to 100°C." Canadian Journal of Chemistry 79, no. 2 (February 1, 2001): 131–44. http://dx.doi.org/10.1139/v01-001.

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The absorption spectra of Fe(II)-chloride solutions were measured in both the UV (ultraviolet) and near-IR (near infrared) regions at temperatures ranging from 10 to 100°C with chloride concentrations from 0.1 to 16 mol kg-1. The stability constants of all Fe(II)-chloride complexes were derived from the spectra using a non-negative nonlinear least-squares computer program (SQUAD). Earlier work on this system reported in the literature was rigorously reassessed. The activity coefficients of the ionic species were calculated using both the Pitzer model and the Helgeson model. The results obtained with UV and near-IR spectra and with different activity coefficient calculation models are in general agreement. Other useful thermodynamic data, including the Gibbs energies, enthalpies, and entropies for complex formation, were also obtained. It was found that the Fe(II)-chloride complexes gradually undergo a configuration transformation from octahedral to tetrahedral coordination as the temperature and (or) chloride concentration increases. This coordination change is of significant importance to the nuclear reactors, as the presence of the tetrahedral complex can increase the solubility of iron in steam generator crevices.Key words: Fe(II)-chloride complexes, stability constants, solution thermodynamics, spectrophotometry, reactor chemistry.

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18

Hakin, Andrew W., Michelle M. Duke, Lori L. Groft, Jocelyn L. Marty, and Matthew L. Rushfeldt. "Calorimetric investigations of aqueous amino acid and dipeptide systems from 288. 15 to 328. 15 K." Canadian Journal of Chemistry 73, no. 5 (May 1, 1995): 725–34. http://dx.doi.org/10.1139/v95-092.

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Densities and heat capacities have been measured for aqueous solutions of L-asparagine, L-glutamine, glycylglycine, glycyl-L-valine, glycyl-L-asparagine, and glycyl-DL-leucine at 288.15, 298.15, 313.15, and 328.15 K. These data have been used to calculate apparent molar volumes, V2,ø, and apparent molar heat capacities, Cp,2,ø, which in turn have been used to obtain standard state volumes, [Formula: see text] and heat capacities, [Formula: see text] The semi-empirical modelling procedures of Helgeson, Kirkham, and Flowers have been used to subdivide the calculated standard state volume and heat capacity data into solvation and nonsolvation contributions. The nonsolvation components of the standard state properties are used in group additivity analyses. These analyses yield structural contributions to standard state volumes and heat capacities for the CH(NH2)CO2H, CH2, OH, COOH, CH, CONH2, and CONH groups. The temperature dependences of these contributions are discussed. Some comments are reported concerning the practicality of using the thermodynamic properties of aqueous amino acid and peptide systems as the basis for modelling standard state thermodynamic properties of aqueous protein systems. Keywords: heat capacities, densities, volumes, amino acids, peptides, group additivity.

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19

Graham, C. M. "H. C. Helgeson Chemical Transport in Metasomatic Processes Proceedings of NATO Advanced Studies Institute, Dordrecht, Holland. (D. Reidel) 1987 xxv+782 pp., Price £94·25." Mineralogical Magazine 52, no. 368 (December 1988): 735. http://dx.doi.org/10.1180/minmag.1988.052.368.26.

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20

Puigdomènech, I., E. Colàs, M. Grivé, I. Campos, and D. García. "A tool to draw chemical equilibrium diagrams using SIT: Applications to geochemical systems and radionuclide solubility." MRS Proceedings 1665 (2014): 111–16. http://dx.doi.org/10.1557/opl.2014.635.

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ABSTRACTA set of computer programs has been developed to draw chemical-equilibrium diagrams. This new software is the Java-language equivalent to the Medusa/Hydra software (developed some time ago in Visual basic at the Royal Institute of Technology, Stockholm, Sweden). The main program, now named “Spana” calls Java programs based on the HaltaFall algorithm. The equilibrium constants that are needed for the calculations may be retrieved from a database included in the software package (“Database” program). This new software is intended for undergraduate students as well as researchers and professionals.The “Spana” code can be easily applied to perform radionuclide speciation and solubility calculations of minerals, including solubility calculations relevant for the performance assessment of a nuclear waste repository. In order to handle ionic strength corrections in such calculations several approaches can be applied. The “Spana” code is able to perform calculations based on three models: the Davies equation; an approximation to the model by Helgeson et al. (HKF); and the Specific Ion-Interaction Theory (SIT). Default SIT-coefficients may be used, which widens the applicability of SIT significantly.A comparison is made here among the different ionic strength approaches used by “Spana” (Davies, HKF, SIT) when modelling the chemistry of radionuclides and minerals of interest under the conditions of a geological repository for nuclear waste. For this purpose, amorphous hydrous Thorium(IV) oxide (ThO2(am)), Gypsum (CaSO4·2H2O) and Portlandite (Ca(OH)2) solubility at high ionic strengths have been modelled and compared to experimental data from the literature. Results show a good fitting between the calculated values and the experimental data especially for the SIT approach in a wide range of ionic strengths (0-4 M).

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21

Johnston, David G. "REVIEW OF METHODOLOGY AND EVALUATION OF PSYCHIATRIC TREATMENT. 1983. Edited by T. Helgeson. Published by Cambridge University Press, Cambridge, New York, New Rachelle, Melbourne and Sydney." Canadian Journal of Neurological Sciences / Journal Canadien des Sciences Neurologiques 12, no. 3 (August 1985): 283. http://dx.doi.org/10.1017/s0317167100047211.

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22

Jurdem, Laurence R. "Jeffrey Helgeson, Crucibles of Black Empowerment: Chicago’s Neighborhood Politics from the New Deal to Harold Washington. Chicago: The University of Chicago Press, 2014. Pp. 378. Cloth $35.00." Journal of African American History 102, no. 1 (January 2017): 108–10. http://dx.doi.org/10.5323/jafriamerhist.102.1.0108.

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23

Dick, J. M., D. E. LaRowe, and H. C. Helgeson. "Temperature, pressure, and electrochemical constraints on protein speciation: Group additivity calculation of the standard molal thermodynamic properties of ionized unfolded proteins." Biogeosciences 3, no. 3 (July 21, 2006): 311–36. http://dx.doi.org/10.5194/bg-3-311-2006.

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Abstract. Thermodynamic calculations can be used to quantify environmental constraints on the speciation of proteins, such as the pH and temperature dependence of ionization state, and the relative chemical stabilities of proteins in different biogeochemical settings. These calculations depend in part on values of the standard molal Gibbs energies of proteins and their ionization reactions as a function of temperature and pressure. Because these values are not generally available, we calculated values of the standard molal thermodynamic properties at 25°C and 1 bar as well as the revised Helgeson-Kirkham-Flowers equations of state parameters of neutral and charged zwitterionic reference model compounds including aqueous amino acids, polypeptides, and unfolded proteins. The experimental calorimetric and volumetric data for these species taken from the literature were combined with group additivity algorithms to calculate the properties and parameters of neutral and ionized sidechain and backbone groups in unfolded proteins. The resulting set of group contributions enables the calculation of the standard molal Gibbs energy, enthalpy, entropy, isobaric heat capacity, volume, and isothermal compressibility of unfolded proteins in a range of proton ionization states to temperatures and pressures exceeding 100°C and 1000 bar. This approach provides a useful frame of reference for thermodynamic studies of protein folding and complexation reactions. It can also be used to assign provisional values of the net charge and Gibbs energy of ionized proteins as a function of temperature and pH. Using these values, an Eh-pH diagram for a reaction representing the speciation of extracellular proteins from Pyrococcus furiosus and Bacillus subtilis was generated. The predicted predominance limits of these proteins correspond with the different electrochemical conditions of hydrothermal vents and soils. More comprehensive calculations of this kind may reveal pervasive chemical potential constraints on the interactions of microbes with their environment.

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24

Miron, George D., Allan M. M. Leal, and Alina Yapparova. "Thermodynamic Properties of Aqueous Species Calculated Using the HKF Model: How Do Different Thermodynamic and Electrostatic Models for Solvent Water Affect Calculated Aqueous Properties?" Geofluids 2019 (February 7, 2019): 1–24. http://dx.doi.org/10.1155/2019/5750390.

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Thermodynamic properties of aqueous species are essential for modeling of fluid-rock interaction processes. The Helgeson-Kirkham-Flowers (HKF) model is widely used for calculating standard state thermodynamic properties of ions and complexes over a wide range of temperatures and pressures. To do this, the HKF model requires thermodynamic and electrostatic models of water solvent. In this study, we investigate and quantify the impact of choosing different models for calculating water solvent volumetric and dielectric properties, on the properties of aqueous species calculated using the HKF model. We identify temperature and pressure conditions at which the choice of different models can have a considerable effect on the properties of aqueous species and on fluid mineral equilibrium calculations. The investigated temperature and pressure intervals are 25–1000°C and 1–5 kbar, representative of upper to middle crustal levels, and of interest for modeling ore-forming processes. The thermodynamic and electrostatic models for water solvent considered are: Haar, Gallagher and Kell (1984), Wagner and Pruß (2002), and Zhang and Duan (2005), to calculate water volumetric properties, and Johnson and Norton (1991), Fernandez and others (1997), and Sverjensky and others (2014), to calculate water dielectric properties. We observe only small discrepancies in the calculated standard partial molal properties of aqueous species resulting from using different water thermodynamic models. However, large differences in the properties of charged species can be observed at higher temperatures (above 500°C) as a result of using different electrostatic models. Depending on the aqueous speciation and the reactions that control the chemical composition, the observed differences can vary. The discrepancy between various electrostatic models is attributed to the scarcity of experimental data at high temperatures. These discrepancies restrict the reliability of the geochemical modeling of hydrothermal and ore formation processes, and the retrieval of thermodynamic parameters from experimental data at elevated temperatures and pressures.

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25

Dick, J. M., D. E. LaRowe, and H. C. Helgeson. "Group additivity calculation of the standard molal thermodynamic properties of aqueous amino acids, polypeptides and unfolded proteins as a function of temperature, pressure and ionization state." Biogeosciences Discussions 2, no. 5 (October 11, 2005): 1515–615. http://dx.doi.org/10.5194/bgd-2-1515-2005.

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Abstract. Thermodynamic calculation of the chemical speciation of proteins and the limits of protein metastability affords a quantitative understanding of the biogeochemical constraints on the distribution of proteins within and among different organisms and chemical environments. These calculations depend on accurate determination of the ionization states and standard molal Gibbs free energies of proteins as a function of temperature and pressure, which are not generally available. Hence, to aid predictions of the standard molal thermodynamic properties of ionized proteins as a function of temperature and pressure, calculated values are given below of the standard molal thermodynamic properties at 25°C and 1 bar and the revised Helgeson-Kirkham-Flowers equations of state parameters of the structural groups comprising amino acids, polypeptides and unfolded proteins. Group additivity and correlation algorithms were used to calculate contributions by ionized and neutral sidechain and backbone groups to the standard molal Gibbs free energy (Δ G°), enthalpy (Δ H°), entropy (S°), isobaric heat capacity (C°P), volume (V°) and isothermal compressibility (κ°T) of multiple reference model compounds. Experimental values of C°P, V° and κ°T at high temperature were taken from the recent literature, which ensures an internally consistent revision of the thermodynamic properties and equations of state parameters of the sidechain and backbone groups of proteins, as well as organic groups. As a result, Δ G°, Δ H°, S° C°P, V° and κ°T of unfolded proteins in any ionization state can be calculated up to T~-300°C and P~-5000 bars. In addition, the ionization states of unfolded proteins as a function of not only pH, but also temperature and pressure can be calculated by taking account of the degree of ionization of the sidechain and backbone groups present in the sequence. Calculations of this kind represent a first step in the prediction of chemical affinities of many biogeochemical reactions, as well as of the relative stabilities of proteins as a function of temperature, pressure, composition and intra- and extracellular chemical potentials of O2 and H2, NH3, H2PO4 and CO2.

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26

Nash, Jerry C. "James Helgeson. Harmonie divine et subjectivité poétique chez Maurice Scève. (Travaux d'Humanisme et Renaissance, 349.) Geneva: Librairie Droz S. A., 2001. 151 pp. index, bibl. $55. ISBN: 2-600-00486-6." Renaissance Quarterly 56, no. 2 (2003): 494–95. http://dx.doi.org/10.2307/1261881.

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27

Holland, T. J. B. "H. C. Helgeson (ed.) 1987. Chemical Transport in Metasomatic Processes, xxv + 782 pp. Dordrecht, Boston, Lancaster, Tokyo: D. Reidel. Price Dfl. 305.00, US $149.00, £94.25 (hard covers). ISBN 90 277 2618 3." Geological Magazine 126, no. 1 (January 1989): 91–92. http://dx.doi.org/10.1017/s0016756800006221.

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28

Kuzner, James A. "James Helgeson. The Lying Mirror: The First-Person Stance and Sixteenth-Century Writing. Les seuils de la modernité 14. Geneva: Librairie Droz, 2012. 334 pp. $67.20. ISBN: 978–2–600–01545–5." Renaissance Quarterly 66, no. 3 (2013): 1106–7. http://dx.doi.org/10.1086/673684.

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29

Amundsen, Lasse, and Arne Reitan. "Transformation from 2-D to 3-D wave propagation for horizontally layered media." GEOPHYSICS 59, no. 12 (December 1994): 1920–26. http://dx.doi.org/10.1190/1.1443579.

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The relationship between 2-D and 3-D wave propagation in horizontally layered media was first investigated by Dampney (1971). In the last few years the usefulness and feasibility of transforming point‐source responses with 3-D geometric spreading to equivalent line‐source responses with 2-D geometric spreading have been thoroughly discussed (see Helgesen, 1990; Wapenaar et al., 1990, 1992; Herrmann, 1992; Helgesen and Kolb, 1993; Amundsen, 1993). In the case of cylindrical symmetry this transformation constitutes a required preprocessing step for several seismic processing algorithms based on 2-D wave propagation. The work of Dampney (1971) has apparently been missed by the authors discussing the 3-D to 2-D geometric spreading transform.

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30

Richard, Laurent. "Calculation of the standard molal thermodynamic properties as a function of temperature and pressure of some geochemically important organic sulfur compounds § §This paper is dedicated to Professor Harold C. Helgeson on the occasion of his seventieth birthday." Geochimica et Cosmochimica Acta 65, no. 21 (November 2001): 3827–77. http://dx.doi.org/10.1016/s0016-7037(01)00761-x.

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31

Kikulis, Lisa M. "Helgesen, Sally. (1995). The web of inclusion." SCHOLE: A Journal of Leisure Studies and Recreation Education 11, no. 1 (April 1996): 165–67. http://dx.doi.org/10.1080/1937156x.1996.11949405.

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32

LaRowe, D. E., and H. C. Helgeson. "Corrigendum to Douglas E. LaRowe and Harold C. Helgeson (2006), “Biomolecules in hydrothermal systems: Calculation of the standard molal thermodynamic properties of nucleic-acid bases, nucleosides, and nucleotides at elevated pressures and pressures,” Geochimica Cosmochimica Acta 70, 4680–4724." Geochimica et Cosmochimica Acta 71, no. 5 (March 2007): 1382. http://dx.doi.org/10.1016/j.gca.2006.10.021.

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33

Krekling-Sandum, Kim. "Mai Brit Helgesen (RED): Mobbing i barnehagen. Et sosialt fenomen." Tidsskriftet Norges Barnevern 92, no. 04 (December 14, 2015): 322–23. http://dx.doi.org/10.18261/issn1891-1838-2015-04-09.

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34

Ranieri, Veronica. "Questionable authorship and the problem of dirty hands: throwing missing authorship into the ring. In response to both Bulow and Helgesson, and Tang." Research Ethics 15, no. 3-4 (August 7, 2019): 1–5. http://dx.doi.org/10.1177/1747016119865728.

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The unethical practice of gift authorship and hostage authorship was portrayed in detail in previous issues of Research Ethics. The aim of this short article is to explore the impact of penalising junior researchers for partaking in gift authorship, and the occurrence and implications of missing authorship in publication. It concludes with reflections on current guidelines and suggestions put forth by Bulow and Helgesson, and Tang, and potential strategies for counteracting the frequency with which both occur.

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Lausten, Martin Schwarz. "Kætterbegrebet i den danske reformationstid." Religionsvidenskabeligt Tidsskrift, no. 59 (December 6, 2012): 42. http://dx.doi.org/10.7146/rt.v0i59.7666.

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I forlængelse af fordømmelsen af Luther for kætteri og hans egen forfølgelse af kættere drøfter artiklen kætterdommen over lægmanden Melchior Hoffmann ved de lutherske myndigheder i Flensburg i 1529. Som led i den åndelige kontrovers mellem katolikken Poul Helgesen (Paul Helie) og de første evangeliske forkyndere anklagede begge parter gensidigt hinanden for kætteri (1525-1535). Med den etablerede evangelisk-lutherske kirke fra 1537 gjorde både Hans Tausen, biskop fra 1542, og Peder Palladius, biskop fra 1537, udfald mod, hvad de opfattede som kættere, det vil sige katolikker, ikke-lutherske protestanter og jøder.

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BOLSTAD, BENTE. "Hardt arbeid, FYLL i helgen." Rus & samfunn 1, no. 05 (November 27, 2007): 30–31. http://dx.doi.org/10.18261/issn1501-5580-2007-05-15.

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B. W. D. Y. "T. S. Bowers, K. J. Jackson & H. C. Helgeson 1984. Equilibrium Activity Diagrams for Coexisting Minerals and Aqueous Solutions at Pressures and Temperatures to 5 kb and 600 °C. xliii + 397 pp. Berlin, Heidelberg, New York, Tokyo: Springer-Verlag. Price DM 98.00, approx. U.S. $34.40. ISBN 3 540 13796 3." Geological Magazine 122, no. 5 (September 1985): 578. http://dx.doi.org/10.1017/s0016756800035639.

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Kellman, Steven G. "Response to Special Issue of Journal of World Literature on Literary Translingualism." Journal of World Literature 3, no. 2 (June 1, 2018): 217–24. http://dx.doi.org/10.1163/24056480-00302006.

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Abstract The articles in this special issue on Literary Translingualism by Helgesson and Kullberg, Robinson, Boyden, and Bodin all insist on language as fluid and non-discrete. What Boyden calls “amphilingualism” is a useful way to describe the porousness of languages. These and other scholars of translingualism are at odds with the ascendant nativism that is enforcing boundaries between nations and languages. Translations further problematize the sovereignty of language and national culture, and they are crucial to the process of elevating a text in the global hypercanon. What Bodin calls “heterographics,” the coexistence of separate scripts within a single text, is a useful extension of literary translingualism.

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Saragovi, Carina, Richard Koestner, Lina Di Dio, and Jennifer Aubé. "Agency, communion, and well-being: Extending Helgeson's (1994) model." Journal of Personality and Social Psychology 73, no. 3 (1997): 593–609. http://dx.doi.org/10.1037/0022-3514.73.3.593.

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ASHER, ROBERT J., and KRISTOFER M. HELGEN. "High level Mammalian taxonomy: a response to Hedges (2011)." Zootaxa 3092, no. 1 (November 7, 2011): 63. http://dx.doi.org/10.11646/zootaxa.3092.1.5.

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Hedges (2011) recently published a critique of our 2010 BMC Evolutionary Biology article (Asher and Helgen 2010) in which he expressed a preference for the name Afrosoricida Stanhope et al. 1998 to signify the mammalian clade of tenrecs (Tenrecidae) and golden moles (Chrysochloridae). He disagreed with what he claimed to be our rationale for preferring another name for this group, Tenrecoidea McDowell 1958. Here is his portrayal of our taxonomic philosophy: "[Asher & Helgen] suggested that strict priority be used as a criterion for high-level names and that such priority be based on group content rather than the procedure used for low-level taxa, anchored to constituent taxa. ... [They] have proposed a radical departure from convention" (Hedges 2011:67–68).

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Samin, Richard. "Stefan Helgesson. Transnationalism in Southern African Literature. Modernists, Realists, and the Inequality of Print Culture." Commonwealth Essays and Studies 34, no. 2 (April 1, 2012): 107–9. http://dx.doi.org/10.4000/ces.6004.

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Bodin, Per-Arne. "Helgen i grenseland. Arven fra Trifon av Petsjenga." Nordisk Østforum 33 (May 10, 2019): 26–28. http://dx.doi.org/10.23865/noros.v33.1637.

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Längst upp på Nordkalotten sammanstrålar fyra länder, två kristna kyrkor, tre olika ortodoxa kyrkliga jurisdiktioner och mer än en handfull olika folk. Caroline Serck-Hanssen fokuserar i sin bok Helgen i Grenseland på en särskild aspekt på detta område, den ortodoxa traditionen i Petjenga (Petsamo) med omgivningar. Två munkar, Trifon och Feodorit, etablerade ortodoxin i trakten och kristnade skoltsamerna på 1500-talet. Det kloster som Trifon byggde brändes ner av finnarna (eller om man så vill svenskarna) 1589. Det flyttades och återetablerades flera gånger. I slutet av 1800-talet blomstrade det och blev både ett pilgrims- och turistmål. Efter första världskriget blev en del av området finskt med namnet Petsamo. Andra världskriget gick hårt åt trakten och efter kriget blev Petsamo sovjetiskt territorium. Efter Sovjetunionens fall har ortodoxin och klostret återetablerats och ortodoxin finns också närvarande på den norska sidan. Den gemensamma ortodoxa traditionen och arvet från Trifon har idag blivit gemensamhetsskapande element i denna trakt. Den nya vägtunneln som förkortar vägen mellan Nordnorge och Ryssland har symtomatiskt nog fått namnet Trifontunneln.

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Graham, Shane. "Transnationalism in Southern African Literature: Modernists, Realists, and the Inequality of Print Culture, by Stefan Helgesson." English Academy Review 27, no. 2 (October 2010): 152–54. http://dx.doi.org/10.1080/10131752.2010.514996.

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van Scheers, Louise. "The Importance That Customers Place On Service Attributes Of Sale Personnel In The Retail Sector." Foundations of Management 7, no. 1 (June 1, 2015): 191–98. http://dx.doi.org/10.1515/fman-2015-0036.

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Abstract When examining retail patronage, customer satisfaction must also be considered. Secondary resources (American Marketing Association, 2007; Berman, 2011; Berry, 2008; Chang, 2006:209; Helgesen & Nesset, 2007: 129 and Kong and Jogaratnam, 2007:279) observed that customer satisfaction is the degree to which a customer’s expectations agree with the actual performance of the product and or service. South African consumers situated in Gauteng consider a sales person’s product knowledge as the most important attribute when making purchasing decisions. American consumers in contrast consider sales person respect as the most important attribute when making purchasing decisions. The implications for marketers and sales managers are that marketers and sales managers must provide adequate training for their sales personnel in order for them to treat customers in such a way to obtain their loyalty. The quality of the products sold at the retailer does not form part of the trade-off options that customers are presented with.

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Bozionelos, Nikos, and Giorgos Bozionelos. "INSTRUMENTAL AND EXPRESSIVE TRAITS: THEIR RELATIONSHIP AND THEIR ASSOCIATION WITH BIOLOGICAL SEX." Social Behavior and Personality: an international journal 31, no. 4 (January 1, 2003): 423–29. http://dx.doi.org/10.2224/sbp.2003.31.4.423.

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The study tested a part of Helgeson's (1994) model and examined the association between instrumental and expressive traits, and their relationship to biological sex in a sample of 242 university students. Women scored higher on expressive traits and marginally lower on instrumental traits. Unmitigated instrumentality was negatively related to expressiveness, but unmitigated expressiveness was not related to instrumentality. Finally, there was no association between instrumental and expressive traits. The findings imply that the interplay of instrumental and expressive traits may not be symmetrical, the former having stronger influence on the manifestation of the latter than vice versa.

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Swan, Claudia. "Reviews of Books:Adulterous Alliances: Home, State, and History in Early Modern European Drama and Painting Richard Helgerson." American Historical Review 107, no. 5 (December 2002): 1628–29. http://dx.doi.org/10.1086/532978.

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Aukrust, Kjerstin. "Hvem eier Jeanne d’Arc? Fra helgen til politisk symbol." Teologisk tidsskrift 9, no. 04 (December 16, 2020): 213–29. http://dx.doi.org/10.18261/issn.1893-0271-2020-04-03.

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Stanislawska, I. "The IPS-HELGEO data base applied to the ionosphere." Advances in Space Research 8, no. 4 (January 1988): 105–8. http://dx.doi.org/10.1016/0273-1177(88)90219-0.

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Escobar-Lasso, Sergio, and Margarita Gil-Fernández. "El mayor registro de elevación de Mustela frenata (Carnivora: Mustelidae) y distribución en el departamento de Calda, región andina de Colombia." Mammalogy Notes 1, no. 2 (December 15, 2014): 7–9. http://dx.doi.org/10.47603/manovol1n2.7-9.

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The long-tailed weasel Mustela frenata Lichtenstein, 1831 has the greatest geographical range among mustelids in the western hemisphere (Harding & Dragoo 2012). The range of M. frenata extends from the north of the United States, near the Canadian border, to northern South America (Sheffield & Thomas 1997), from sea level to 3800 masl (Sheffield & Thomas 1997, Reid & Helgen 2008).

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van Scheers, Louise. "The importance that customers place on service attributes of sale personal in the retail sector." Investment Management and Financial Innovations 13, no. 3 (September 23, 2016): 222–27. http://dx.doi.org/10.21511/imfi.13(3-1).2016.08.

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When examining retail patronage, customer satisfaction must also be considered. Secondary resources (American Marketing Association, 2007; Berman, 2011; Berry, 2008; Chang, 2006, p. 209; Helgesen &amp; Nesset, 2007, p. 129, Kong and Jogaratnam, 2007, p. 279) observed that customer satisfaction is the degree to which customer’s expectations agree with the actual performance of the product and/or service South African consumers situated in Gauteng consider a sales person’s product knowledge as the most important attribute when making purchasing decisions. American consumers, in contrast, consider sales person respect as the most important attribute when making purchasing decisions. The implications for marketers and sales managers are that marketers and sales managers must provide adequate training for their sales personnel in order for them to treat customers in such a way to obtain their loyalty. The quality of the products sold at the retailer does not form part of the trade off options that customers are presented with. Keywords: retail store customer, prices compared to competitors, salesperson product knowledge, salesperson responsiveness, South African retail consumers. JEL Classification: L81, M31

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