Computational method for thermoviscoelasticity with application to rock mechanics. [Ph. D. Thesis]

Lee, S.C.

doi:10.2172/5020299

Cited by 53 publications

(95 citation statements)

References 41 publications

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“…The governing equation with the eigenvector potential A, the winding current I, and the scalar potential differential as the unknown quantity can be expressed by Eqs. (3)- (5) [2].…”

Section: Mathematical Algorithmmentioning

confidence: 99%

“…[D] is the equation for the relationship between the current of the conduction bar and the end-ring current [2]. Figure 1 shows the experimental diagram, and Table 1 lists the specifications of the devices used in the experiment.…”

Section: Mathematical Algorithmmentioning

confidence: 99%

“…A 2D analysis was performed under the conditions that finite-element modeling of the induction motor does not incur any changes in the system in the axial direction, and the electromagnetic field equation derived from Maxwell's equations and the stator and rotor circuit equation were combined and used for the analysis. The backward time-difference method was used for the time derivative term contained in the governing equation [1,2], and the magnetic saturation of the core was reflected through a nonlinear analysis using the Newton-Raphson method [3,4]. The rotation of the rotor was implemented by introducing moving coordinators [5], whereby the rotor was rotated at fixed intervals by inserting a slip line in the air gap [6,7], which shortened the time for element refinement by limiting it to the airgap domain.…”

Section: Introductionmentioning

confidence: 99%

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Steady-State Current Characteristics for Squirrel Cage Induction Motor according to Design Variables of Rotor Bars using Time Difference Finite Element Analysis

Kim¹

2017

Journal of Magnetics

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Induction motors have wide applicability in many fields, both in industrial sectors and households, for their advantages of a high efficiency and robust structure. The introduction of power-source-containing harmonics into the induction motor winding lowers its efficiency and increases its temperature, greatly affecting its operation characteristics. In this study, we performed an electromagnetic field analysis using the time-difference finite-element method with the purpose of analyzing the steady-state current characteristics of an induction motor. Additionally, we calculated the steady-state current with a method combining an electromagnetic field equation and a circuit equation. In the electromagnetic field analysis, the nonlinearity was taken into account using the Newton-Raphson method, and a backward time-difference method was employed for the time derivative term. Then, we compared the steady-state current of the induction motor obtained by calculation with the experimentally measured values, thus validating the proposed algorithm. Furthermore, we analyzed the impacts of the shape and material of the rotor conductor bar of the induction motor on the steady-state current of the main winding.

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“…The governing equation with the eigenvector potential A, the winding current I, and the scalar potential differential as the unknown quantity can be expressed by Eqs. (3)- (5) [2].…”

Section: Mathematical Algorithmmentioning

confidence: 99%

Section: Mathematical Algorithmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Steady-State Current Characteristics for Squirrel Cage Induction Motor according to Design Variables of Rotor Bars using Time Difference Finite Element Analysis

Kim¹

2017

Journal of Magnetics

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“…16 The associated basis functions for Br and I atom developed by Lee were used. 17 The basis functions for Br and I atom were consisted of the (7s7p3d2f)…”

Section: Calculationsmentioning

confidence: 99%

Computational Study of the Molecular Structure, Vibrational Spectra and Energetics of the OIO Cation

2004

Bulletin of the Korean Chemical Society

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Molecular geometries for the cationic and neutral species of OXO (X=Cl, Br, and I) are optimized using the Hartree-Fock (HF) theory, the second order Møller-Plesset perturbation theory (MP2), the density functional theory with the B3LYP hybrid functional (B3LYP), and the coupled cluster theory using single and double excitation with a perturbational treatment of triplet excitation (CCSD[T]) methods, with two basis sets of triple zeta plus polarization quality. The single point calculations for these species are performed at the CCSD(T,Full) level. The harmonic vibrational frequencies for these species are calculated at the HF, MP2, B3LYP and CCSD(T) levels. The adiabatic ionization potential for OIO is calculated to be 936.7 kJ/mol at the CCSD(T,Full) level and the correct value is estimated to be around 945.4 kJ/mol.

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“…Tritium labeled vitamin E in the skin can be either vitamin E, a-tocopherolquinone or a-tocopherolquinol. 13) Since the molecular weights of these three compounds are similiar; they differ by only one hydroxyl functional group and two hydrogen atoms respectively, a-tocopherol (C 29 H 50 O 2 ϭ430.7), a-tocopherol quinone (C 29 H 49 O 3 ϭ445.7), a-tocopherolquinol (C 29 H 51 O 3 ϭ 447.7). We investigated the binding property of vitamin E during skin permeation by employing the bi-layer model.…”

mentioning

confidence: 99%

An Experimental Approach to Study the Binding Properties of Vitamin E (.ALPHA.-Tocopherol) during Hairless Mouse Skin Permeation.

Lee

Tojo

2001

CHEMICAL & PHARMACEUTICAL BULLETIN

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Vitamin E acts as an antioxidant and protects molecules, especially polyunsaturated fats, against attack with free-radicals and the initiation of peroxidation.1,2) It has been generally accepted that vitamin E plays an important role in the stabilization of biological membranes that contain high levels of polyunsaturated fatty acids. [3][4][5] Therefore without sufficient amounts of vitamin E, the arrangement of the hydrocarbon regions of biological membranes become disordered and oxidative destruction of the polyunsaturated fatty acids may be facilitated. The effect of vitamin E on the skin permeability is more significant when the phospholipid contains a higher content of arachidonic acid residues. Vitamin E forms a complex with the phospholipids having arachidonyl residues that are present in cellular membranes. Diplock and Lucy reported that a-tocopherol could reduce the permeability to glucose and chromate ions when the liposome consisted of phospholipids containing arachidonic acid residues. 6,7) In studies to understand the role of vitamin E in our body, many researches have stressed the structural link between vitamin E and phospholipids in cellular membranes.For most drugs, after removing the donor solution after achieving a steady state of permeation rate, the profile shows an increase in skin permeation rate due to some reservoir capacity of the skin. 7-9) Miselinicky 10) reported that materials with good lipid solubility or a high affinity for protein would be retained within the skin structure to the greatest extent since increasing lipophilicity and protein binding promote reservoir formation. However, vitamin E which is a very lipophilic compound (partition coefficient, octanol/water: 437) did not show any increase after desorption study indicating no reservoir formation or very strong chemical binding which can not be explained by simple Langmuir-type binding. 9,11) To determine the amount of vitamin E which attends in the diffusion process (the free diffusable drug concentration), skin permeation studies with whole skin and stripped skin were performed. From the lag times and the steady state skin permeation rates, the drug solubility, diffusivity and partition coefficient in each skin layer were determined by employing a bi-layer model. 12) From our previous experiments, it was shown that vitamin E metabolized into a-tocopherol quinone and a-tocopherol quinol in hairless mouse skin. To understand the binding property of vitamin E after topical application, tritium labeled vitamin E was employed. Tritium labeled vitamin E in the skin can be either vitamin E, a-tocopherolquinone or a-tocopherolquinol.13) Since the molecular weights of these three compounds are similiar; they differ by only one hydroxyl functional group and two hydrogen atoms respectively, a-tocopherol (C 29 H 50 O 2 ϭ430.7), a-tocopherol quinone (C 29 H 49 O 3 ϭ445.7), a-tocopherolquinol (C 29 H 51 O 3 ϭ 447.7). We investigated the binding property of vitamin E during skin permeation by employing the bi-layer model. 12)Differenti...

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Computational method for thermoviscoelasticity with application to rock mechanics. [Ph. D. Thesis]

Cited by 53 publications

References 41 publications

Steady-State Current Characteristics for Squirrel Cage Induction Motor according to Design Variables of Rotor Bars using Time Difference Finite Element Analysis

Steady-State Current Characteristics for Squirrel Cage Induction Motor according to Design Variables of Rotor Bars using Time Difference Finite Element Analysis

Computational Study of the Molecular Structure, Vibrational Spectra and Energetics of the OIO Cation

An Experimental Approach to Study the Binding Properties of Vitamin E (.ALPHA.-Tocopherol) during Hairless Mouse Skin Permeation.

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