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Adaptive Moment-of-Fluid Method : a New Volume-Tracking Method for Multiphase Flow Computation
Hyung Taek Ahn,Mikhail Shashkov 한국전산유체공학회 2008 한국전산유체공학회 학술대회논문집 Vol.2008 No.-
A novel adaptive mesh refinement (AMR) strategy based on the Moment-of-Fluid (MOF) method for volume-tracking dynamic interface computation is presented. The Moment-of-Fluid method is a new interface reconstruction and volume advection method using volume fraction as well as material centroid. The mesh refinement is performed based on the error indicator, the deviation of the actual centroid obtained by interface reconstruction from the reference centroid given by moment advection process. Using the AMR-MOF method, the accuracy of volume-tracking computation with evolving interfaces is improved significantly compared to other published results.
Goffin, Dorothee,Bystricky, Peter,Shashkov, Alexander S.,Lynch, Mary,Hanon, Emilien,Paquot, Michel,Savage, Angela V. Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.11
Prebiotic isomaltooligosaccharide preparations contain $\alpha$-D-glucooligosaccharides comprising isomaltooligosaccharides (IMOs) and non-prebiotic maltooligosaccharides (MOs). They are both glucose oligosaccharides characterized by their degree of polymerization (DP) value (from 2 to $\sim$10), linkages types and positions (IMOs: $\alpha$-(1$\rightarrow$2, 3, 6 and in a lower proportion internal 1$\rightarrow$4) linkages, MOs: α-(1$\rightarrow$4) linkages). Their structure is the key factor for their prebiotic potential. In order to determine and elucidate the exact structure of unknown IMOs and MOs, unambiguous assignments of $^{13}C$ and $^1H$ chemical shifts of commercial standards, representative of IMOs and MOs diversity, have been determined using optimized standard one and two-dimensional experiments such as $^1H$ NMR, $^{13}C$ NMR, APT and ${^1}H-{^1}H$ COSY, TOCSY, NOESY and <$^1H-{^{13}}C$ heteronuclear HSQC, HSQC-TOCSY, and HMBC. Here we point out the differential effect of substitution by a glucose residue at different positions on chemical shifts of anomeric as well as ring carbons together with the effect of the reducing end configuration for low DP oligosaccharides and diasteroisotopic effect for H-6 protons. From this study, structural $^{13}C$ specific spectral features can be identified as tools for structural analysis of isomaltooligosaccharides.
Dorothée Goffin,Peter Bystricky,Alexander S. Shashkov,Mary Lynch,Emilien Hanon,Michel Paquot,Angela V. Savage 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.11
Prebiotic isomaltooligosaccharide preparations contain α-D-glucooligosaccharides comprising isomaltooligosaccharides (IMOs) and non-prebiotic maltooligosaccharides (MOs). They are both glucose oligosaccharides characterized by their degree of polymerization (DP) value (from 2 to ~10), linkages types and positions (IMOs: α-(1→2, 3, 6 and in a lower proportion internal 1→4) linkages, MOs: α-(1→4) linkages). Their structure is the key factor for their prebiotic potential. In order to determine and elucidate the exact structure of unknown IMOs and MOs, unambiguous assignments of 13C and 1H chemical shifts of commercial standards, representative of IMOs and MOs diversity, have been determined using optimized standard one and two-dimensional experiments such as 1H NMR, 13C NMR, APT and 1H-1H COSY, TOCSY, NOESY and 1H-13C heteronuclear HSQC, HSQC-TOCSY, and HMBC. Here we point out the differential effect of substitution by a glucose residue at different positions on chemical shifts of anomeric as well as ring carbons together with the effect of the reducing end configuration for low DP oligosaccharides and diasteroisotopic effect for H-6 protons. From this study, structural 13C specific spectral features can be identified as tools for structural analysis of isomaltooligosaccharides.
Study of Ga<SUB>1-x</SUB>Mn<SUB>x</SUB>As Critical Behavior by Using Thermal Diffusivity
Shavkat U. Yuldashev,Khusan T. Igamberdiev,이세준,권영해,강태원,Anatoly G. Shashkov 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.21
The temperature dependence of the thermal diffusivity has been measured in the close vicinity of the magnetic phase transition in Ga_(1−x)Mn_xAs. The thermal diffusivity of Ga_(1−x)Mn_xAs samples demonstrated a pronounced -shaped peak, which indicates the existence of a second-order phase transition in the samples. The thermal diffusivity peak maximum is located near the Curie temperature;therefore, it is attributed to a ferromagnetic-paramagnetic phase transition. Taking into account that the inverse of the thermal diffusivity has the same critical behavior as the specific heat,we determine the critical exponent . The critical behavior of the specific heat of the Ga_(1−x)Mn_xAs samples is well described by the mean-field, including Gaussian fluctuations, model.
Thermal Diffusivity Study of Weak Ferromagnetism in Zn_(1−x)Co_xO
Khusan T. Igamberdiev,Shavkat U. Yuldashev,권영해,강태원,Vasiliy O. Pelenovich,Anatoly G. Shashkov 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.51
Thermal diffusivity measurements have been conducted in order to study the origin of ferromagnetism in Zn_(1−x)Co_xO. Thin films of Zn_(1−x)Co_xO (x = 0.03) were deposited on Si (100) substrates by using ultrasonic spray pyrolysis. Magnetization M(H) measurements at low temperaturs show a hysteresis loop, which indicates the existence of ferromagnetic ordering in Zn<SUB>0.97</SUB>Co<SUB>0.03</SUB>O. However, the magnetic moment per Co ion is much lower than expected. A comparison of M(T) measured at zero-field-cooled (ZFC) and at field-cooled (FC) conditions shows a superparamagnetic-like behavior, and the blocking temperature is about 130 K. The temperature dependence of the thermal diffusivity of Zn_(0.97)Co_(0.03)O shows a pronounced lambda-shaped minimum at 130 K, which indicates the existence of a second-order phase transition at that temperature. The weak ferromagnetism in Zn_(0.97)Co_(0.03)O with a Curie temperature of 130 K is ascribed to an uncompensated magnetic moment at the surface of CoO nanoclusters with radii of about 1 nm.