Results 61 to 70 of about 334,510 (171)

Nano-Scale core effects on electronic structure properties of gallium arsenide

Iraqi Journal of Physics, 2012
Ab – initio density function theory (DFT) calculations coupled with Large Unit Cell (LUC) method were carried out to evaluate the electronic structure properties of III-V zinc blend (GaAs). The nano – scale that have dimension (1.56-2.04)nm.
Mohammed T. Hussein
doaj  

Numerical investigation of the thermal-hydraulic performance of a novel parabolic trough wavy tubular receiver by using FMWNCT/oil-nanofluid coupled with fins

Case Studies in Thermal Engineering
This study employs a computational fluid dynamics (CFD) approach to assess the performance of a novel wavy profile tube receiver. It integrates rectangular fins and an Oil-based nanofluid, specifically utilizing Thermodyne GG-03 synthetic oil combined ...
S.M.A. Rahman, Salah Issa, Abdul Ghani Olabi, Mohammad Ali Abdelkareem   +3 more
doaj   +1 more source

Estudio espectroscópico experimental y computacional de Ibuprofeno y sus precursores de síntesis

La Granja: Revista de Ciencias de la Vida, 2015
Se presenta un estudio comparativo de los espectros infrarrojo (IR) y ultravioleta/visible (UV/VIS) de ibuprofeno, isobutilbenceno y 4-isobutilacetofenona obtenidos experimentalmente, con los calculados computacionalmente.
Sebastián Cuesta, Lorena Meneses
doaj   +1 more source

Current Helicity and Twist as Two Indicators of The Mirror Asymmetry of solar Magnetic Fields

, 2008
A comparison between the two tracers of magnetic field mirror asymmetry in solar active regions, twist and current helicity, is presented. It is shown that for individual active regions these tracers do not possess visible similarity while averaging by ...
A.A. Pevtsov, A.R. Choudhuri, D. N. Tomin, D. Sokoloff, D. Sokoloff, D.M. Rust, E.N. Parker, E.N. Parker, E.N. Parker, H. Xu, H. Zhang, H. Zhang, H. Zhang, H. Zhang, J. Zhao, K. M. Kuzanyan, K.M. Kuzanyan, L. Gizon, L. Woltjer, M. Hagino, N. Kleeorin, N. Kleeorin, N. Seehafer, S.D. Bao, S.D. Bao, T.J. Wang, V. N. Obridko, V. N. Tutubalin, V.I. Abramenko, V.I. Abramenko, Yu.B. Ponomarenko, Yu.B. Ponomarenko   +31 more
core   +1 more source

ESTUDIO DE EFECTOS ASIMÉTRICOS Y DÍA DE LA SEMANA EN EL ÍNDICE DE VOLATILIDAD 'VIX' STUDY OF ASYMMETRIC AND DAY OF THE WEEK EFFECTS IN 'VIX'* VOLATILITY INDEX

Revista Ingenierías Universidad de Medellín, 2007
En este trabajo se estudian los efectos asimétricos y día de la semana en el Índice de Volatilidades VIX de la Chicago Board Option Exchange del 02/01/2003 al 30/03/2007.
Pilar Beatriz Álvarez Franco, Diego Alexánder Restrepo, Fredy Ocaris Pérez   +2 more
doaj  

Comparison study of CC and CH vibration frequencies and eelectronic properties for mono, Di, Tri, and tetra-rings layer of arm chair (SWCNTs)

Iraqi Journal of Physics, 2019
Semi-empirical methods were applied for calculating the vibration frequencies and IR absorption intensities for normal coordinates of the {mono (C56H28), di (C84H28), tri (C112H28) and tetra (C140H28)} -rings layer for (7,7) armchair single wall carbon ...
Huda N. Al-Ani
doaj   +1 more source

Theoretical and computational investigations on estimation of viscosity of ionic liquids for green adsorbent: Effect of temperature and composition

Case Studies in Thermal Engineering
Ionic liquids can be recognized as green adsorbent for water purification due to their superior characteristics compared to conventional organic solvents.
Zhaoxiong Han
doaj   +1 more source

Spectroscopic Investigations and DFT Calculations on 3-(Diacetylamino)-2-ethyl-3H-quinazolin-4-one

Journal of Spectroscopy, 2016
The theoretical and experimental vibrational frequencies of 3-(diacetylamino)-2-ethyl-3H-quinazolin-4-one (2) were investigated. The experimental Laser-Raman spectrum (4000–100 cm−1) and FT-IR spectrum (4000–400 cm−1) of the newly synthesized compound ...
Yusuf Sert, Fatih Ucun, Gamal A. El-Hiti, Keith Smith, Amany S. Hegazy   +4 more
doaj   +1 more source

DFT study of the effect of substituents on the absorption and emission spectra of Indigo

Chemistry Central Journal, 2012
Background Theoretical analyses of the indigo dye molecule and its derivatives with Chlorine (Cl), Sulfur (S), Selenium (Se) and Bromine (Br) substituents, as well as an analysis of the Hemi-Indigo molecule, were performed using the Gaussian 03 software ...
Cervantes-Navarro Francisco, Glossman-Mitnik Daniel   +1 more
doaj   +1 more source

Circadian analysis of myocardial infarction incidence in an Argentine and Uruguayan population

BMC Cardiovascular Disorders, 2006
Background The occurrence of variations in the spectrum of cardiovascular disease between different regions of the world and ethnic groups have been the subject of great interest.
Nicola-Siri Leonardo, D'Negri Carlos E, Vigo Daniel E, Girotti Luis A, Cardinali Daniel P   +4 more
doaj   +1 more source