Báo cáo vật lý: "PHONON SPECTRA OF HIGH TEMPERATURE SUPERCONDUCTOR Bi2Sr2Ca2Cu3O10: THEORY AND EXPERIMENT" potx

... page) Journal of Physical Science, Vol. 17(2), 51–66, 2006 51 PHONON SPECTRA OF HIGH TEMPERATURE SUPERCONDUCTOR Bi2Sr2Ca2Cu3O10: THEORY AND EXPERIMENT S. Mohan* and P. Murugesan ... through Raman and infrared spectra. Hence a theoretical evaluation of phonon frequencies of high temperature superconductors assumes importance. The Fourier transform Raman spectra of Bi2Sr2Ca2Cu3O10 ... Cardona and others [1–5] studied the Raman and Infrared spectra of the superconductivity cuprate perovskites and reported the origin of phonon softening and the systematic vibrations of phonon...

Báo cáo vật lý: "Electrochemical Studies of Mild Steel Corrosion Inhibition in Aqueous Solution by Uncaria gambir Extract" doc

... all of the samples were immersed for 60 min over a frequency range of 100 kHz–1 Hz with a signal amplitude perturbation of 5 mV and a scan rate of 1 mVs–1. Next, it was fitted with sets of ... concentration of 0 ppm and 10 ppm. The colour changes of dark blue magnetite were observed for the rest of the concentrations. This means that the protective film of a stable oxide of magnetite ... parameters of the Nyquist plots of the ethyl acetate extract of gambir in different concentrations. From this experiment, the Nyquist plot shows that, at a concentration of 150 ppm, the percentages of...

Báo cáo vật lý: "A Perspective of Oil Palm and Its Wastes" doc

... steam. Most of this water ends up in POME. For each kg of palm oil, roughly 1 kg of wet EFB is produced. As over 60% of the wet EFB consists of water, and the heating value of the dry EFB ... day), of which 16 million tonnes (321,000 barrels) per day were exported. The domestic petroleum demand of 26 million tonnes represented 44% of the total energy demand of 60 million tonnes of ... discharge of the effluents.27 The total A Perspective of Oil Palm and Its Waste 72 providing competitive prices on oil palm, the liberalisation of export duties and the encouragement of counter-trades...

Báo cáo vật lý: " WEAR MECHANISM OF TiN, TiAlN AND TiCN COATED DRILLS DURING DRILLING OF CARBON STEEL" pptx

... composed of ferum Journal of Physical Science, Vol. 18(1), 75–85, 2007 75 WEAR MECHANISM OF TiN, TiAlN AND TiCN COATED DRILLS DURING DRILLING OF CARBON STEEL R.J. Talib*, M.R.M. Toff and ... piece as a result of broken cutting lip and land, and blunting-off chisel wedge. 6. ACKNOWLEDGEMENTS The authors are grateful to the Government of Malaysia for the funding of this research. ... which have low boiling temperatures such as Mn and P might have depleted away and could not be detected by spot EDX analysis. Boiling temperature of Mn and P is about 1246°C and 44.1°C, respectively....

Báo cáo vật lý: "MORPHOLOGY STUDIES OF POROUS GaP, SYNTHESIZED BY LASER-INDUCED ETCHING" pdf

... emission from high porosity structures arises from quantum confinement effects as a result of the conversion of the material band gap from indirect to direct and consequently high photoluminescence ... its bulk indirect band gap.15–16 The confinement of electrons and holes in quantum wires of GaP in the porous layer was proposed as the origin for the blue and UV emission bands in porous GaP. ... irradiation times 5, 10 and 15 min and with a fixed power density of 12 W/cm2. It can be seen from the SEM micrographs that the surface morphology and pore structure of the etched GaP samples...

Báo cáo vật lý: "AN ANFIS-BASED PREDICTION FOR MONTHLY CLEARNESS INDEX AND DAILY SOLAR RADIATION: APPLICATION FOR SIZING OF A STAND-ALONE PHOTOVOLTAIC SYSTEM" ppsx

... humidity, temperature, and etc. 7. ACKNOWLEDGEMENT The authors would like to thank the Director of the ONM (Office of National Meteorology of Algiers), for making available the database of ... sizing of sand-alone PV systems: A review and a proposed new method. Solar Energy Materials and Solar Cells, 26, 51–69. 21. Shrestha, G.B. & Goel, L. (1998). A study on optimal sizing of stand-alone ... Mellit1,2, A. Hadj Arab2,3 and S. Shaari4* 1Department of Electronics, Faculty of Sciences Engineering, Jijel University of Médéa, 26000, Algeria 2Development Centre of Renewable Energy (CDER),...

Báo cáo vật lý: "ULTRASONIC STUDY OF THE SELF–ASSOCIATION OF ANILINE IN ETHANOL-CYCLOHEXANE MIXTURES" pptx

... independent of temperature for all liquids, ∑=iieffmxM where, x is the mole fraction and m is the molecular weight of ith component and AE stands for excess property of any given ... components of the system. Amalendu Pal et al.5 have made an attempt to study the speed of sound and isentropic compressibilities of mixtures containing polyethers and ethyl acetate at 298.15 K and ... existing in the mixtures of ethanol with cyclohexane and with aniline, using the sound velocity data. The present work deals with the measurement of U, ρ and η, and computation of related parameters...

Báo cáo vật lý: "AN OVERVIEW OF BIASED ESTIMATOR" pptx

... Estimator of parameter , −rdγ1ˆ()−′′′=rrr rr′γT TZZT TZY is the PCRE of parameter , is the remaining eigenvectors of γrT′ZZ after having deleted of the columns of and satisfying ... advantages of the ORRE and the Shrunken Estimator. The Class Estimator combined the techniques of the ORRE and the PCRE while the Class Estimator combined the techniques of the Liu Estimator and ... Estimator of parameter , γ1ˆ()−′′′=rrr rr′γT TZZT TZY is the PCRE of parameter , is the remaining eigenvectors of γrT′ZZ after having deleted of the columns of and satisfying...

Báo cáo vật lý: "Mixing Behavior of Binary Polymer Particles in Bubbling Fluidized Bed" doc

... number of particles in a given mass of sample depends on the size distribution of the components. Thus, for a binary mixture of spherical particles of components A and B with proportions of PA ... and PB, respectively, the number of particles of A or B per unit mass of component A or B, respectively is given by Equation (4). B⎤⎥⎦ Mass of particles in Number of particles Mass of ... lack of reliable experimental methods.2–5 Quantification of solids flow pattern and solids mixing is very essential for proper design and scale-up of fluidized beds.6 The basic mechanism of...

Báo cáo vật lý: "Phase Transformation of Rust in the Presence of Various Tannins" pot

... FTIR spectra of chestnut tannins with respect to time of immersion. initially began to reduce after two weeks of immersion and almost disappeared after three and four weeks. The degree of transformation ... as mangrove, quebracho and mimosa consist of oligimers and polymers of flavanoids while hydrolysable tannins such as chestnut are made up of sugars (primarily glucose) and gallic acid. Tannins ... samples (powder and plates) were immersed in 10 ml of 5 g/l chestnut, mimosa and mixed (chestnut: mimosa = 1:1) tannin solutions, and allowed to react for the duration of 1, 2, 3 and 4 weeks....

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