Colebrook and White Transition Formula

Scheelite (CaWO4)-type microphosphors were synthesized by the precipitation method assisted with cetyltrimethyl ammonium bromide (CTAB). All compounds crystallized in the tetragonal structure with space group [Formula: see text] (No. 88). FE-SEM micrographs illustrate the spherical-like morphologies and rough surface. PL spectra indicate the broad emission peak maximum at 613 nm under UV excitation. Luminescence decay curves monitored by [Formula: see text] transition ([Formula: see text] nm) of Eu[Formula: see text] in doped CaWO4 are presented, the curves exhibit a single-exponential feature and the lifetime for doped CaWO4 is 0.61 ms.

Download Full-text

NEW EMISSION BANDS OF ,

Canadian Journal of Physics ◽

10.1139/p61-129 ◽

1961 ◽

Vol 39 (8) ◽

pp. 1138-1145 ◽

Cited By ~ 20

Author(s):

Y. Tanaka ◽

T. Namioka ◽

A. S. Jursa

Keyword(s):

Transition Formula ◽

Condensed Discharge

Thirty-eight new bands of nitrogen were observed in the region 2050–3070 Å in an a-c. condensed discharge of neon mixed with a small amount of nitrogen. It was determined that these bands result from the transition [Formula: see text] of [Formula: see text].

Download Full-text

Thioamide spectroscopy: long path length absorption and quantum chemical studies of thioformamide vapour, CHSNH2/CHSND2

Canadian Journal of Chemistry ◽

10.1139/v87-348 ◽

1987 ◽

Vol 65 (9) ◽

pp. 2100-2105 ◽

Cited By ~ 14

Author(s):

R. H. Judge ◽

D. C. Moule ◽

J. D. Goddard

Keyword(s):

Path Length ◽

Lower State ◽

Amino Groups ◽

Vibrational Assignments ◽

Transition Formula ◽

Out Of Plane ◽

Chemical Studies ◽

Moderate Resolution ◽

Quantum Chemical Studies ◽

Franck Condon

The 270 nm absorption spectra of thioformamide, CHSNH2 and CHSND2, have been photographically recorded under conditions of long path length (88 m) and moderate resolution (7.5 Å/mm). The absorption was assigned to the electron promotion, nS → π* (CS), and to the electronic transition, [Formula: see text]. The spectra proved to be complex, highly congested and somewhat diffuse which limited the extent of the vibrational assignments. Progressions in five members were observed in both CHSNH2/CHSND2 in intervals of 516/496 cm−1 which were assigned to ν10, the out-of-plane aldehyde wagging mode. It was concluded on Franck–Condon grounds that the [Formula: see text] molecule was non-planar at the aldehyde center. Structures and vibrational frequencies were calculated for the [Formula: see text] and the[Formula: see text] electronic states at the 3-21G* SCF level. The calculations confirmed that the lower state was strictly planar and predicted that both the aldehyde and amino groups were pyramidal in the upper electronic state.

Download Full-text

New atomic data for the transition Formula in Fe XVIII

Monthly Notices of the Royal Astronomical Society ◽

10.1093/mnras/225.2.377 ◽

1987 ◽

Vol 225 (2) ◽

pp. 377-380 ◽

Cited By ~ 13

Author(s):

M. Mohan ◽

K. L. Baluja ◽

A. Hibbert ◽

K. A. Berrington

Keyword(s):

Atomic Data ◽

Transition Formula

Download Full-text

Effect of Sr2TiMnO6 fillers on mechanical, dielectric and thermal behaviour of PMMA polymer

Journal of Advanced Dielectrics ◽

10.1142/s2010135x15500186 ◽

2015 ◽

Vol 05 (03) ◽

pp. 1550018 ◽

Cited By ~ 13

Author(s):

P. Thomas ◽

B. S. Dakshayini ◽

H. S. Kushwaha ◽

Rahul Vaish

Keyword(s):

Coefficient Of Thermal Expansion ◽

Thermo Gravimetric Analysis ◽

Mechanical Analysis ◽

Gravimetric Analysis ◽

X Ray Diffraction ◽

Scanning Calorimetry ◽

Melt Mixing ◽

Transition Formula ◽

Thermal Stability Of ◽

Pmma Polymer

Composites of poly(methyl methacrylate) (PMMA) and [Formula: see text] (STMO) were fabricated via melt mixing followed by hot pressing technique. These were characterized using X-ray diffraction (XRD), thermo gravimetric analysis (TGA), differential scanning calorimetry (DSC), thermo mechanical analysis (TMA) and impedance analyser for their structural, thermal and dielectric properties. The coefficient of thermal expansion (CTE) was measured between 40°C and 100°C for pure PMMA is 115.2 ppm/°C, which was decreased to 78.58 ppm/°C when the STMO content was increased to 50 wt.% in PMMA. There was no difference in the glass transition ([Formula: see text]) temperature of the PMMA polymer and their composites. However, the FTIR analysis indicated possible interaction between the PMMA and STMO. The density and the hardness were increased as the STMO content increased in the PMMA matrix. Permittivity was found to be as high as 30.9 at 100 Hz for the PMMA+STMO-50 wt.% composites, indicating the possibility of using these materials for capacitor applications. The thermal stability of polymer was enhanced by incorporation of STMO fillers.

Download Full-text

SU(3) Polyakov linear-sigma model: Conductivity and viscous properties of QCD matter in thermal medium

International Journal of Modern Physics A ◽

10.1142/s0217751x1650175x ◽

2016 ◽

Vol 31 (34) ◽

pp. 1650175 ◽

Cited By ~ 16

Author(s):

Abdel Nasser Tawfik ◽

Abdel Magied Diab ◽

M. T. Hussein

Keyword(s):

Lattice Qcd ◽

Mean Field ◽

Field Approximation ◽

Linear Sigma Model ◽

Dense Medium ◽

Mean Field Approximation ◽

Chiral Phase ◽

Strange Quarks ◽

Transition Formula ◽

Thermal Medium

In mean field approximation, the grand canonical potential of SU(3) Polyakov linear-[Formula: see text] model (PLSM) is analyzed for chiral phase transition, [Formula: see text] and [Formula: see text] and for deconfinement order-parameters, [Formula: see text] and [Formula: see text] of light- and strange-quarks, respectively. Various PLSM parameters are determined from the assumption of global minimization of the real part of the potential. Then, we have calculated the subtracted condensates [Formula: see text]. All these results are compared with recent lattice QCD simulations. Accordingly, essential PLSM parameters are determined. The modeling of the relaxation time is utilized in estimating the conductivity properties of the QCD matter in thermal medium, namely electric [Formula: see text] and heat [Formula: see text] conductivities. We found that the PLSM results on the electric conductivity and on the specific heat agree well with the available lattice QCD calculations. Also, we have calculated bulk and shear viscosities normalized to the thermal entropy, [Formula: see text] and [Formula: see text], respectively, and compared them with recent lattice QCD. Predictions for [Formula: see text] and [Formula: see text] are introduced. We conclude that our results on various transport properties show some essential ingredients, that these properties likely come up with, in studying QCD matter in thermal and dense medium.

Download Full-text

Effects of chemical composition and mean coordination number on glass transitions in Ge–Sb–Se glasses

Modern Physics Letters B ◽

10.1142/s0217984917503420 ◽

2017 ◽

Vol 31 (36) ◽

pp. 1750342 ◽

Cited By ~ 1

Author(s):

Wen-Hou Wei

Keyword(s):

Glass Transition ◽

Chemical Composition ◽

Coordination Number ◽

Structural Phase ◽

Stoichiometric Composition ◽

Glass Transitions ◽

Fragility Index ◽

Scanning Calorimetry ◽

Transition Formula ◽

The Mean

Glass transitions in the Ge–Sb–Se glasses were investigated by means of differential scanning calorimetry (DSC) under non-isothermal conditions. The glass transition temperature [Formula: see text], activation energy of glass transition [Formula: see text], and fragility index as functions of the mean coordination number (MCN) and atomic percent of Ge were examined. The maximum value of [Formula: see text] in each group of the glasses occurred at the chemically stoichiometric composition, suggesting a glass transition threshold. The [Formula: see text] and fragility index were calculated from the heating rate dependence of [Formula: see text]. Both [Formula: see text] and fragility index show the minima at MCN = 2.4 which can be attributed to the structural phase transition of a covalently glassy network at MCN = 2.4. The analysis of the experimental results suggests that both the chemical composition and MCN have significant effects on the glass transitions in Ge–Sb–Se glasses.

Download Full-text

The behavior of thermodynamic kinetic on Bi2Se3 compound by 131Xe ion implantation

Modern Physics Letters B ◽

10.1142/s0217984920504175 ◽

2020 ◽

Vol 34 (36) ◽

pp. 2050417

Author(s):

S. R. Azimova ◽

Y. I. Aliyev ◽

D. M. Mirzayeva

Keyword(s):

Phase Transition ◽

Heavy Ions ◽

Scanning Calorimetry ◽

Change Mechanism ◽

Transition Formula ◽

Thermodynamical Parameters ◽

Energy Formula ◽

Dsc Analyses ◽

Transition Change ◽

Dsc Method

Thermal parameters of the [Formula: see text] compound were investigated by Differential Scanning Calorimetry (DSC) method. Four different phases were identified in the temperature range of [Formula: see text]C. Thermodynamical parameters were determined for each phase transition. [Formula: see text] samples were irradiated by 167 MeV energy [Formula: see text]Xe ions at the [Formula: see text], [Formula: see text] and [Formula: see text] ion/cm2 intensities. The DSC analyses of the irradiated samples were carried out and determined that the temperature and thermodynamical parameters of the phase transition change in the [Formula: see text] compound under the influence of swift heavy ions. The change mechanism of the thermodynamical parameters has been determined depending on the irradiation doses.

Download Full-text