• Title, Summary, Keyword: Thermodynamic parameters

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Thermodynamic Properties and Self Diffusions from Rheological Parameters of Eyring-Halsey Model (Eyring-Halsey 모델의 유동파라메타로부터 열역학 성질과 자체 확산)

  • Kim, Nam Jeong
    • Journal of the Korean Chemical Society
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    • v.58 no.3
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    • pp.251-257
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    • 2014
  • The stress relaxation of poly(methyl acrylate)-poly(acrylonitrile) copolymer samples were carried out in air and distilled water at various temperatures using the tensile tester with the solvent chamber. The rheological parameters were obtained by applying the experimental stress relaxation curves to the theoretical equation of the Eyring-Halsey non-Newtonian model. The self diffusion, hole volume, viscosities, and thermodynamic parameters of copolymer samples were calculated from rheological parameters and crystallite size in order to study of flow segments in amorphous region. It was observed that the rheological parameters of these copolymer samples are directly related to the self diffusion, hole volume, viscosities, and thermodynamic parameters of flow segments.

Thermodynamic Parameters for Micelle Formation of Dodecylpyridinium Chloride (Dodecylpyridinium Chloride의 micelle 形成의 熱力學變數)

  • Han, Man-Un
    • Journal of the Korean Chemical Society
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    • v.10 no.2
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    • pp.103-108
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    • 1966
  • The effect of temperature on the critical micelle concentration of dodecylpyridinium chloride has been determined by electrical conductance method over the range from $5^{\circ}C\;to\;50^{\circ}C$. The values of the change in heat content, ${\Delta}H_m$, and the other thermodynamic parameters have been estimated using the equation of temperature dependence on the critical micelle concentration for the same temperature range. The significance of these thermodynamic quantities and their relations to the various current theories of micelle forming processes were discussed.

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Development of a Computer Program to Calculate Thermodynamic Properties of Oxygen (산소의 열역학 상태량 계산을 위한 전산 프로그램 개발)

  • Park, Kyoung-Kuhn
    • Proceedings of the KSME Conference
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    • pp.256-260
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    • 2003
  • A computer program to calculate thermodynamic properties of oxygen is developed. Procedures for the calculation is briefly discussed. The program calculates unknown thermodynamic properties fixing the state with two independent input properties. If input value by user is inappropriate, it displays an error message. In addition user can change units with easy. The program developed in this work can be utilized to calculate parameters required for the simulation and design of an equipment using oxygen.

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IDENTIFICATION OF THERMODYNAMIC PARAMETERS OF ARCTIC SEA ICE AND NUMERICAL SIMULATION

  • Xiw, Chao;Feng, Enmin;Li, Zhijun;Peng, Lu
    • Journal of applied mathematics & informatics
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    • v.26 no.3_4
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    • pp.519-530
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    • 2008
  • This paper studies the multi-domain coupled system of one dimensional Arctic temperature field and establishes identification model about the thermodynamic parameters of sea ice (heat storage capacity, density and conductivity) by the so-called output least-square estimate according to the temperature data acquired by a monitor buoy installed in the Arctic ocean. By the optimal control theory, the existence and dependability of weak solution and the identifiability of identification model have been given. Moreover, necessary optimality condition is proposed. Furthermore, the optimal algorithm for the identification model is constructed. By using the optimal thermodynamic parameters of Arctic sea ice, the numerical simulation is implemented, and the numerical results of temperature distribution of Arctic sea ice are demonstrated.

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Theoretical Investigations on the Copolymerization of Vinyl Pivalate and Vinyl Acetate (피발산비닐과 아세트산비닐의 공중합에 관한 이론적 고찰)

  • Ghim, Han-Do;Kim, Jae-Pil;Lyo, Won-Seok
    • Proceedings of the Korean Fiber Society Conference
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    • pp.29-32
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    • 2002
  • Thermodynamics of copolymerization is one of the fundamental elements for studying the effects of copolymerization parameters on the copolymer characteristics. Up until now, it has not been easy work not because there are not effective models but because the known thermodynamic values are limited to some copolymer pairs. Recently, owing to the development of molecular modeling methods, some thermodynamic parameters can be calculated and estimated on computer. (omitted)

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Thermodynamic Analysis of Power Generation Cycle Utilizing LNG (LNG 냉열이용 동력사이클 해석)

  • 최권일;장호명
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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    • pp.165-168
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    • 1999
  • Thermodynamic cycle analysis has been performed for the power generation systems to utilize the cold energy of liquefied natural gas (LNG). Among many possible configurations of the cycle, the open Rankine cycle, the closed Rankine cycle, and the closed Brayton cycle are selecte for the analysis because of their practical importance. The power output per unit mass of LNG has been analytically calculated for various design parameters. The optimal conditions for the parameters to maximize the power output are presented and some of the design considerations are discussed.

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Linear Relationships Between Thermodynamic Parameters Part IV Studies on Basicities of Some Substituted Dimethylanilines (熱力學函數間의 直線關係 第四報 Dimethylaniline 直換體의 鑒基度에 關한 硏究)

  • Lee, Ik-Choon;Park, Yong-Ja
    • Journal of the Korean Chemical Society
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    • v.8 no.1
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    • pp.15-19
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    • 1964
  • Basicities of nine dimethylanilines have been determined in 50, 70, and 90 volume % ethanol, at $25^{\circ},\;30^{\circ},\;35^{\circ},\;and\;40^{\circ}C$. Temperature coefficients were found to be independent of solvent composition, while they showed a linear correlation with basicities of the compounds. Thermodynamic parameters obtained have been used in the discussion of substituent and solvent effects in conjunction with the general equation derived in the preceding papers.

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Molecular Dynamics Simulation on thermodynamic and Structural Properties of Liquid Hydrocarbons : Normal Alkanes

  • Im, Won-Pil;Won, Young-Do
    • Bulletin of the Korean Chemical Society
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    • v.15 no.10
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    • pp.852-856
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    • 1994
  • A series of aliphatic hydrocarbons, methane to hexane in the liquid state, are modeled with the molecular mechanical potential parameters treating all hydrogen degrees of freedom explicitly. Thermodynamic properties (heat capacities and heats of vaporization) are calculated from relatively short (20ps) molecular dynamics trajectories. The liquid state structures are also examined through various radial distribution functions. Molecular dynamics simulations reproduce experimentally measured properties within a few percent errors, thus indicate that the present set of all-hydrogen parameters is suitable for simulating macromolecular systems in bulk.

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