scholarly journals Closed-Loop Miscibility Gap and Quantitative Tie-Lines in Ternary Membranes Containing Diphytanoyl PC

2006 ◽  
Vol 90 (12) ◽  
pp. 4428-4436 ◽  
Author(s):  
Sarah L. Veatch ◽  
Klaus Gawrisch ◽  
Sarah L. Keller
Keyword(s):  
Closed Loop ◽  
Miscibility Gap ◽  
Tie Lines

Quaternary Phase Equilibria vs. Strain-Energy at the In.53Ga.47As/InP Interface

1989 ◽  
Vol 145 ◽  
Author(s):  
Allan E. Schultz ◽  
Y. Austin Chang
Keyword(s):  
Phase Equilibria ◽  
Strain Energy ◽  
Dominant Factor ◽  
Miscibility Gap ◽  
Bulk Solid ◽  
Tie Lines ◽  
Binary Substrate ◽  
Film Substrate ◽  
Gap Data ◽  
Quaternary Phase Equilibria

AbstractExtensive new data and modeling in the In-Ga-As system has allowed the authors to reexamine the phase equilibria between the melt and the epitaxial solid. A detailed thermodynamic model was constructed with the following improvements: (1) The solid-solid interaction parameters were based on InAs-GaAs miscibility gap data, and (2) liquid-bulk solid, as well as liquid-epitaxial solid, tie-lines were used. Comparison of tie- lines from epitaxial systems and bulk systems demonstrated that strain energy is not the dominant factor in equilibrium growth of epitaxial solid films of In1-xGaxAs on any Ill-V binary substrate. Both the “lattice- pulling” effect and the “substrate-orientation” effect were shown to be caused by different quaternary equilibria at the In1-xGaxAs/InP interface, and not by film-substrate strain.

Calculation of critical point coordinates of ternary miscibility gap from experimental tie-lines

2014 ◽  
Vol 92 (12) ◽  
pp. 3008-3016 ◽  
Author(s):  
Christelle Goutaudier ◽  
Fabrice Bonnet ◽  
Richard Tenu ◽  
Olivier Baudouin ◽  
Jean-Jacques Counioux
Keyword(s):  
Critical Point ◽  
Miscibility Gap ◽  
Tie Lines

scholarly journals Latencies in Power Systems: A Database-Based Time-Delay Compensation for Memory Controllers

Electronics ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 208
Author(s):  
Alexander Molina-Cabrera ◽  
Mario A. Ríos ◽  
Yvon Besanger ◽  
Nouredine Hadjsaid ◽  
Oscar Danilo Montoya
Keyword(s):  
Time Delay ◽  
Power Systems ◽  
Time Delays ◽  
Closed Loop ◽  
Control Strategies ◽  
Area Measurement ◽  
Delay Compensation ◽  
Measurement Systems ◽  
Tie Lines ◽  
Time Delay Compensation

Time-delay is inherent to communications schemes in power systems, and in a closed loop strategy the presence of latencies increases inter-area oscillations and security problems in tie-lines. Recently, Wide Area Measurement Systems (WAMS) have been introduced to improve observability and overcome slow-rate communications from traditional Supervisory Control and Data Acquisition (SCADA). However, there is a need for tackling time-delays in control strategies based in WAMS. For this purpose, this paper proposes an Enhanced Time Delay Compensator (ETDC) approach which manages varying time delays introducing the perspective of network latency instead dead time; also, ETDC takes advantage of real signals and measurements transmission procedure in WAMS building a closed-loop memory control for power systems. The strength of the proposal was tested satisfactorily in a widely studied benchmark model in which inter-area oscillations were excited properly.

Closed-loop miscibility gap in sulfur–tellurium melts: structural evidence and thermodynamic modelling

2006 ◽  
Vol 18 (50) ◽  
pp. 11471-11486 ◽  
Author(s):  
Marie-Vanessa Coulet ◽  
Robert Bellissent ◽  
Christophe Bichara
Keyword(s):  
Closed Loop ◽  
Thermodynamic Modelling ◽  
Miscibility Gap

Anomalous small-angle-X-ray scattering on Al–Zn and Al–Zn–Ag alloys

1985 ◽  
Vol 18 (6) ◽  
pp. 480-486 ◽  
Author(s):  
O. Lyon ◽  
J. J. Hoyt ◽  
R. Pro ◽  
B. E. C. Davis ◽  
B. Clark ◽  
...  
Keyword(s):  
Small Angle ◽  
Ternary Alloys ◽  
Weighted Sums ◽  
Miscibility Gap ◽  
Two Phase ◽  
Anomalous Effect ◽  
Angle Scattering ◽  
Zn Content ◽  
Tie Lines ◽  
Radiation Laboratory

Anomalous small-angle scattering (ASAXS) spectra from Al–Zn and Al–Zn–Ag alloys have been recorded at the Stanford Synchrotron Radiation Laboratory (SSRL). The data were obtained at different energies close to the Zn absorption edge. For the binary alloy, the ASAXS intensities follow quantitatively the variation in the atomic scattering factor of zinc. For the ternary alloys, the anomalous effect decreases when the Zn content decreases. Although only weighted sums of the partial structure functions could be determined, it is shown that the results are consistent with the `two-phase' unmixing model and the direction of tie lines of the metastable miscibility gap has been determined. A new method for analyzing ASAXS data for two absorption edges is proposed.

A Comparison of Tem and Apfim to the Interpretation of Modulated Microstructures

1985 ◽  
Vol 43 ◽  
pp. 70-71
Author(s):  
M.G. Burke ◽  
M.K. Miller
Keyword(s):  
Low Temperature ◽  
Microstructural Characterization ◽  
Superlattice Reflection ◽  
High Volume ◽  
Atom Probe ◽  
Dark Field ◽  
Miscibility Gap ◽  
Second Phase ◽  
Two Phase ◽  
Probe Field

Interpretation of fine-scale microstructures containing high volume fractions of second phase is complex. In particular, microstructures developed through decomposition within low temperature miscibility gaps may be extremely fine. This paper compares the morphological interpretations of such complex microstructures by the high-resolution techniques of TEM and atom probe field-ion microscopy (APFIM).The Fe-25 at% Be alloy selected for this study was aged within the low temperature miscibility gap to form a <100> aligned two-phase microstructure. This triaxially modulated microstructure is composed of an Fe-rich ferrite phase and a B2-ordered Be-enriched phase. The microstructural characterization through conventional bright-field TEM is inadequate because of the many contributions to image contrast. The ordering reaction which accompanies spinodal decomposition in this alloy permits simplification of the image by the use of the centered dark field technique to image just one phase. A CDF image formed with a B2 superlattice reflection is shown in fig. 1. In this CDF micrograph, the the B2-ordered Be-enriched phase appears as bright regions in the darkly-imaging ferrite. By examining the specimen in a [001] orientation, the <100> nature of the modulations is evident.

Transition alpha structure in beta-isomorphous Nb-Hf alloys

1987 ◽  
Vol 45 ◽  
pp. 232-233
Author(s):  
R.W. Carpenter ◽  
Changhai Li ◽  
David J. Smith
Keyword(s):  
Solid Solution ◽  
Solution Phase ◽  
Miscibility Gap ◽  
Large Strains ◽  
Solid Solution Phase ◽  
Two Phase ◽  
Diffuse Intensity ◽  
Metastable Form ◽  
The Matrix ◽  
Equilibrium Morphology

Binary Nb-Hf alloys exhibit a wide bcc solid solution phase field at temperatures above the Hfα→ß transition (2023K) and a two phase bcc+hcp field at lower temperatures. The β solvus exhibits a small slope above about 1500K, suggesting the possible existence of a miscibility gap. An earlier investigation showed that two morphological forms of precipitate occur during the bcc→hcp transformation. The equilibrium morphology is rod-type with axes along <113> bcc. The crystallographic habit of the rod precipitate follows the Burgers relations: {110}||{0001}, <112> || <1010>. The earlier metastable form, transition α, occurs as thin discs with {100} habit. The {100} discs induce large strains in the matrix. Selected area diffraction examination of regions ∼2 microns in diameter containing many disc precipitates showed that, a diffuse intensity distribution whose symmetry resembled the distribution of equilibrium α Bragg spots was associated with the disc precipitate.

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