Determination of the Recombination Processes in Copper Ternary Chalcopyrites by Phototransport Measurements

1996 ◽  
Vol 426 ◽  
Author(s):  
Y. Lubianmker ◽  
G. Bitton ◽  
I. Balberg ◽  
O. Resto ◽  
S. Z. Weisz
Keyword(s):  
Level Structure ◽  
Experimental Results ◽  
The Other ◽  
Recombination Level ◽  
Recombination Processes ◽  
General Recombination ◽  
Level Model ◽  
Ternary Chalcopyrites ◽  
Two Level Model

AbstractWe have measured the phototransport properties of CuGaSe2 films as a function of temperature. The simplest model which is consistent with all the experimental results consists of two recombination levels, one of which is donor-like and the other is acceptor-like. This model is similar to the symmetrical two-level model, which we have recently suggested for CuInS2 films. We thus conclude that this model, with slight variations, represents the general recombination level structure in all copper ternary chalcopyrites.

Circulation Sensitivity to Heating in a Simple Model of Baroclinic Turbulence

2010 ◽  
Vol 67 (5) ◽  
pp. 1543-1558 ◽  
Author(s):  
Pablo Zurita-Gotor ◽  
Geoffrey K. Vallis
Keyword(s):  
Heat Transport ◽  
Primitive Equation ◽  
Upper Troposphere ◽  
Differential Heating ◽  
Energy Cycle ◽  
Level Model ◽  
Actual Strength ◽  
Heating Model ◽  
Two Level Model

Abstract This paper examines the sensitivity of the circulation of an idealized primitive equation two-level model on the form and strength of the heating, aiming to understand the qualitatively different sensitivity of the isentropic slope on differential heating reported by previous idealized studies when different model formulations are used. It is argued that this contrasting behavior might arise from differences in the internal determination of the heating. To test this contention, the two-level model is forced using two different heating formulations: a standard Newtonian cooling formulation and a highly simplified formulation in which the net lower-to-upper troposphere heat transport is prescribed by construction. The results are interpreted using quasigeostrophic turbulent closures, which have previously been shown to have predictive power for the model. It is found that the strength of the circulation, as measured by eddy length and velocity scales and by the strength of the energy cycle, scales with the vertical heating (the lower-to-upper troposphere heat transport), with a weak dependence. By contrast, the isentropic slope is only sensitive to the structure of the heating, as measured by the ratio between meridional versus vertical heating, and not to the actual strength of the heating. In general the heating is internally determined, and this ratio may either increase or decrease as the circulation strengthens. It is shown that the sign of the sensitivity depends on the steepness of the relation between vertical heating and stratification for the particular heating formulation used. The quasigeostrophic limit (fixed stratification) and the prescribed heating model constrain the possible range of behaviors and provide bounds of sensitivity for the model. These results may help explain the different sensitivity of the isentropic slope on differential heating for dry and moist models and for quasigeostrophic and primitive equation models.

Quantitative Determimatioh of Sulfur, Chlorine, Potassium, Calcium, Scandium and Titanium in Aqueous Solutions by Radioisotopic Excited Fluorescent Spectrometer and by Conventional X-Ray Spectrometer

1970 ◽  
Vol 14 ◽  
pp. 102-126 ◽  
Author(s):  
Frank L. Chan ◽  
W. Barclay Jones
Keyword(s):  
Particle Size ◽  
Aqueous Solutions ◽  
Experimental Results ◽  
The Other ◽  
X Rays ◽  
Helium Atmosphere ◽  
X Ray ◽  
Effect Of Particle Size ◽  
The One

AbstractAn x-ray spectrometer with experimental results is herewith described using a radiosotope source Fe55 having a halflife of 2.6 years. As a result of the disintegration, the managanese x-rays are capable of exciting fluorescent x-rays of such elements as sulfur, chlorine, potassium, calcium, scandium and titanium in aqueous solutions. These elements with the Ka wavelengths ranging from 5.3729 Å to 2.7496 Å may be designated as between the very soft x-rays on the one hand and the hard x-rays on the other. The x-ray spectrometer presently described has achieved a resolution of 136 ev, FWHM.Simultaneously, these elements have also been quantitatively determined by conventional x-ray fluorescent spectrometers. Since one of the spectrometers is designed to operate in vacuum as well as in helium or air, determination of sulfur, potassium and calcium were carried out in vacuum. Determination of chlorine was carried out in a helium atmosphere, Calcium, scandium and titanium were determined in air with an air-path spectrometer.In the present study aqueous solutions containing these elements were used. The use of aqueous solutions has the inherent advantages of being homogeneous and free from effect of particle size.

Etude des mouvements de molécules linéaires en phase liquide par analyse du profil des bandes d'absorption infrarouge.: II. Bande v3 du sulfure de carbonyle

1972 ◽  
Vol 50 (2) ◽  
pp. 217-225 ◽  
Author(s):  
A. M. Bize ◽  
J. Soussen-Jacob ◽  
J. Vincent-Geisse ◽  
D. Legay ◽  
J. P. Perchard
Keyword(s):  
Potential Barrier ◽  
Correlation Functions ◽  
Carbonyl Sulfide ◽  
Experimental Results ◽  
The Other ◽  
Band Width ◽  
Saturated Hydrocarbons ◽  
Rotational Effect ◽  
The Mean

The band width and profile of v3 mode of carbonyl sulfide (OCS) dissolved in about 30 solvents have been examined. The study of temperature broadening permits the separation of the vibrational and rotational effects and the determination of the potential barrier to rotation. Correlation functions have been plotted from the experimental results; the mean squared torques acting on carbonyl sulfide in various solvents have been calculated from the second and the fourth moments. The obtained results bear evidence of a dominant rotational effect for solutions in saturated hydrocarbons while, for the other solvents, vibrational broadening proves important.

De Haas – van Alphen effect and Fermi surface of the intermetallic compound PtSn

1970 ◽  
Vol 48 (10) ◽  
pp. 1151-1160 ◽  
Author(s):  
W. N. Cathey ◽  
P. T. Coleridge ◽  
J.-P. Jan
Keyword(s):  
Intermetallic Compound ◽  
Fermi Surface ◽  
Cross Sections ◽  
Experimental Results ◽  
The Other ◽  
Platinum Atom ◽  
Spin Splitting ◽  
Approximate Determination ◽  
Formula Unit

Extremal cross sections of the Fermi surface of the intermetallic compound PtSn (NiAs structure) have been determined by means of the de Haas – van Alphen effect. The Fermi surface proposed here is similar to that found in isostructural AuSn by Edwards et al. Several of the frequencies have been inverted to yield the profile of the corresponding sheets of the Fermi surface. An approximate determination of the dimensions of the other sheets shows that the observed Fermi surface encloses 4.60 ± 0.27 electrons per formula unit; this suggests that one or several sheets of the Fermi surface containing 0.6 d-band holes per platinum atom have remained undetected. Some cyclotron masses have been measured and to explain all the features of the experimental results, it is necessary to invoke spin splitting with a g factor different from 2, and to postulate magnetic breakdown.

scholarly journals Textile wing fabric for emergency response UAS

2020 ◽  
Vol 71 (04) ◽  
pp. 321-326
Author(s):  
ADRIAN SĂLIȘTEAN ◽  
CARMEN MIHAI
Keyword(s):  
Emergency Response ◽  
Mechanical Characteristics ◽  
Statistical Data ◽  
Breaking Strength ◽  
Air Permeability ◽  
Experimental Results ◽  
The Other ◽  
Shape Stability ◽  
International Testing

The fabrics used to manufacture parachutes and paragliders must have several specific characteristics: the mass of fabric per unit of surface must be low while the other physical-mechanical characteristics (the axial breaking strength load, the relative and absolute elongation, the tear resistance of the fabric and the assemblies, air permeability) must have high values. The paper deals with the analysis of qualitative aspects of several parachute fabrics that are used as a baseline in the development of a novel fabric. The results of experiments have materialized in statistical data, diagrams and graphs and their interpretation leads to the determination of the fabric variant that best meets the requirements of the destination. The destination is a patent pending inflatable wing design that utilizes a single skin construction and solid reinforcements in the sewing for shape stability. It is worth noting that the experimental results were compared with values indicated in specific international testing norms.

Magnetoresistance of La2/3(CaxBa1-x)1/3MnO3/NiO Composite Materials

2005 ◽  
Vol 475-479 ◽  
pp. 897-900
Author(s):  
Shui Yuan Chen ◽  
Zhi Gao Huang ◽  
Heng Lai ◽  
Rongquan Gai ◽  
Feng Ming Zhang ◽  
...  
Keyword(s):  
Composite Materials ◽  
Sol Gel ◽  
Percolation Model ◽  
Experimental Results ◽  
Tunneling Magnetoresistance ◽  
Nio Nanoparticles ◽  
Gel Method ◽  
Three Samples ◽  
Level Model ◽  
Two Level Model

Ferromagnetic (FM) La2/3(Ca0.6Ba0.4)1/3MnO3 and antiferromagnetic (AFM) NiO nanoparticles were synthesized using sol-gel method, respectively. La2/3(Ca0.6Ba0.4)1/3MnO3 (1 mol)/ x NiO (x= 0, 0.05 and 0.15mol) composites with the coated NiO were prepared. The experimental results indicate that, both phases of LCBMO and NiO coexist clearly in the composites and the sizes of the NiO nanoparticles in the intergranular region between the LCBMO particles are very small; the interface of NiO influences evidently the value of MR and it is found that the tunneling MR for x=0.05 is the largest in three samples. The magnetoresistance behavior has been explained by two-level model of tunneling magnetoresistance and percolation model well.

scholarly journals Entropies and IPR as Markers for a Phase Transition in a Two-Level Model for Atom–Diatomic Molecule Coexistence

Entropy ◽  
2022 ◽  
Vol 24 (1) ◽  
pp. 113
Author(s):  
Ignacio Baena ◽  
Pedro Pérez-Fernández ◽  
Manuela Rodríguez-Gallardo ◽  
José Miguel Arias
Keyword(s):  
Phase Transition ◽  
Ground State ◽  
Large Particle ◽  
State Energy ◽  
Particle Number ◽  
Diatomic Molecules ◽  
The Other ◽  
Abrupt Changes ◽  
Level Model ◽  
Two Level Model

A quantum phase transition (QPT) in a simple model that describes the coexistence of atoms and diatomic molecules is studied. The model, which is briefly discussed, presents a second-order ground state phase transition in the thermodynamic (or large particle number) limit, changing from a molecular condensate in one phase to an equilibrium of diatomic molecules–atoms in coexistence in the other one. The usual markers for this phase transition are the ground state energy and the expected value of the number of atoms (alternatively, the number of molecules) in the ground state. In this work, other markers for the QPT, such as the inverse participation ratio (IPR), and particularly, the Rényi entropy, are analyzed and proposed as QPT markers. Both magnitudes present abrupt changes at the critical point of the QPT.

A BCS-Like Approach to the Excited State in 11Li

1997 ◽  
Vol 12 (37) ◽  
pp. 2883-2888 ◽  
Author(s):  
M. Kyotoku ◽  
C. L. Lima ◽  
E. Baldini Neto ◽  
N. Teruya
Keyword(s):  
Excited State ◽  
Model Calculation ◽  
Excited States ◽  
Experimental Results ◽  
Halo Nuclei ◽  
First Excited State ◽  
Level Model ◽  
Good Agreement ◽  
Two Level Model

A modified BCS approach is used to interpret the first excited state of 11 Li halo nuclei. In this scheme, a simple two-level model calculation is performed leading to results in good agreement with the experimental results for 11 Li for both ground and first excited states. A comparison with exact and QRPA calculations is also presented.

scholarly journals DETERMINATION OF OPTIMAL WORK START TIME

Transport ◽  
2007 ◽  
Vol 22 (1) ◽  
pp. 45-49 ◽  
Author(s):  
Shu-Guang Li
Keyword(s):  
Travel Time ◽  
Travel Cost ◽  
Decision Variable ◽  
Stochastic Dynamic ◽  
Start Time ◽  
Departure Time ◽  
Level Model ◽  
Upper Level ◽  
Two Level Model

The question is: whether the system total travel cost and travel time are reduced by adjusting the work start time or not? This paper proposes the two‐level model for answering the question; the upper‐level minimizes the system travel cost and travel time by using the work start time as a decision variable, the lower‐level models the stochastic dynamic simultaneous route/departure time equilibrium problem. Finally, numerical results of a small network are provided to illustrate the behavior of the model.

scholarly journals FABRIC FOR SINGLE SKIN TEXTILE WING

2019 ◽  
Vol 2019 ◽  
pp. 220-223
Author(s):  
Adrian SALISTEAN ◽  
Carmen MIHAI ◽  
Irina CRISTIAN ◽  
Daniela FARIMA ◽  
Cristina PIROI
Keyword(s):  
Mechanical Characteristics ◽  
Statistical Data ◽  
Breaking Strength ◽  
Air Permeability ◽  
Experimental Results ◽  
The Other ◽  
Wing Design ◽  
Shape Stability ◽  
International Testing

The fabrics used to make parachutes and paragliders must have the several specific characteristics: the mass of fabric per unit of surface must be low while the other physical- mechanical characteristics (the axial breaking strength load, the relative and absolute elongation, the tear resistance of the fabric and the assemblies, air permeability) must be at a maximum. The paper deals with the analysis of qualitative aspects of several parachute fabrics that are used as a baseline in the development of a novel fabric. The results of experiments have materialized in statistical data, diagrams and graphs and their interpretation leads to the determination of the fabric variant that best meets the requirements of the destination. The destination is a patent pending inflatable wing design that utilizes a single skin construction and solid reinforcements in the sewing for shape stability. It is worth noting that the experimental results were compared with values indicated in specific international testing norms.

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