A Note on the Stability of Metzler's Phase Diagram

1974 ◽  
Vol 82 (3) ◽  
pp. 641-644 ◽  
Author(s):  
Don Patinkin
Keyword(s):  
Phase Diagram ◽  
The Stability

scholarly journals The stability and electronic and photocatalytic properties of the ZnWO4 (010) surface determined from first-principles and thermodynamic calculations

RSC Advances ◽  
2021 ◽  
Vol 11 (38) ◽  
pp. 23477-23490
Author(s):  
Yonggang Wu ◽  
Jihua Zhang ◽  
Bingwei Long ◽  
Hong Zhang
Keyword(s):  
Phase Diagram ◽  
Density Functional Theory ◽  
First Principles ◽  
Density Functional ◽  
Thermodynamic Calculations ◽  
Photocatalytic Properties ◽  
Thermodynamic Approach ◽  
Functional Theory ◽  
Stability Phase Diagram ◽  
The Stability

The ZnWO4 (010) surface termination stability is studied using a density functional theory-based thermodynamic approach. The stability phase diagram shows that O-Zn, DL-W, and DL-Zn terminations of ZnWO4 (010) can be stabilized.

scholarly journals Information storage in permalloy modulated magnetic nanowires

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Guidobeth Sáez ◽  
Pablo Díaz ◽  
Eduardo Cisternas ◽  
Eugenio E. Vogel ◽  
Juan Escrig
Keyword(s):  
Magnetic Material ◽  
Phase Diagram ◽  
Magnetic Fields ◽  
Domain Walls ◽  
Wire Diameter ◽  
Information Storage ◽  
Magnetic Nanowires ◽  
The Wire ◽  
The Stability ◽  
Cylindrical Wire

AbstractA long piece of magnetic material shaped as a central cylindrical wire (diameter $$d=50$$ d = 50 nm) with two wider coaxial cylindrical portions (diameter $$D=90$$ D = 90 nm and thickness $$t=100$$ t = 100 nm) defines a bimodulated nanowire. Micromagnetism is invoked to study the equilibrium energy of the system under the variations of the positions of the modulations along the wire. The system can be thought of as composed of five independent elements (3 segments and 2 modulations) leading to $$2^5=32$$ 2 5 = 32 possible different magnetic configurations, which will be later simplified to 4. We investigate the stability of the configurations depending on the positions of the modulations. The relative chirality of the modulations has negligible contributions to the energy and they have no effect on the stability of the stored configuration. However, the modulations are extremely important in pinning the domain walls that lead to consider each segment as independent from the rest. A phase diagram reporting the stability of the inscribed magnetic configurations is produced. The stability of the system was then tested under the action of external magnetic fields and it was found that more than 50 mT are necessary to alter the inscribed information. The main purpose of this paper is to find whether a prototype like this can be complemented to be used as a magnetic key or to store information in the form of firmware. Present results indicate that both possibilities are feasible.

scholarly journals Development of a CALPHAD Thermodynamic Database for Pu-U-Fe-Ga Alloys

2019 ◽  
Vol 9 (23) ◽  
pp. 5040 ◽  
Author(s):  
Emily E. Moore ◽  
Patrice E.A. Turchi ◽  
Alexander Landa ◽  
Per Söderlind ◽  
Benoit Oudot ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Density Functional ◽  
Ternary Phase Diagram ◽  
Thermodynamic Database ◽  
Impurity Effects ◽  
Functional Theory ◽  
Formation Enthalpies ◽  
Temperature Ranges ◽  
The Stability ◽  
First Time

The interaction of actinides and actinide alloys such as the δ-stabilized Pu-Ga alloy with iron is of interest to understand the impurity effects on phase stability. A newly developed and self-consistent CALPHAD thermodynamic database is presented which covers the elements: Pu, U, Fe, Ga across their whole composition and temperature ranges. The phase diagram and thermodynamic properties of plutonium-iron (Pu-Fe) and uranium-iron (U-Fe) systems are successfully reassessed, with emphasis on the actinide rich side. Density functional theory (DFT) calculations are performed to validate the stability of the stoichiometric (Pu,U)6Fe and (Pu,U)Fe2 compounds by computing their formation enthalpies. These data are combined to construct the Pu-U-Fe ternary phase diagram. The thermodynamic assessment of Fe-Ga is presented for the first time and application to the quaternary Pu-U-Fe-Ga system is discussed.

Hydrochemistry Research of Intercrystalline with Pore Brine and Pre-3D Modelling of Heibeiwadi Brine Deposit

2018 ◽  
Vol 783 ◽  
pp. 170-175
Author(s):  
Huang Song
Keyword(s):  
Phase Diagram ◽  
Qaidam Basin ◽  
Central Area ◽  
Research Area ◽  
3D Modelling ◽  
Salting Out ◽  
Characteristics Analysis ◽  
Water Salt ◽  
The Stability ◽  
Brine Layer

Intercrystalline and pore brine develop extensively in the Heibewadi research area which is located at south foot of Altun mountain of Qaidam basin. In central area, intercrystalline brine’s depths range from 5m to 90m. In northwest, south area and central deeper area, pore brine develops under intercrystalline brine layer. The 2 types of aquifers have strong yield property, TDS is 200-350g/l with average of 276g/l. Main salt compound can be mined out economically. According to analysis result of intercrystalline brine, TDS, Cl-, Na+, K+, Mg2+, Li+ irons’ grades are very steady. That mean intercrystalline brine exist in the water-salt system under balance. Only the stability of Ca2+ and SO42- are slightly poor. According the Kurtosis characteristics analysis, Ca2+, SO42- are no-normal positively platykurtic distribution, K+, Cl- and PH are normal positively platykurtic distribution. These 2 groups fall into a sub-class. And the combined with normal negatively platykurtic distribution-TDS and fall into platykurtic distribution group. Mg2+, Li+ are normal positively peaked distribution; Na+ is normal negatively peaked distribution. They all belong to peaked distribution group. According to Na+, K+, Mg2+//Cl-H2O quarternary phase diagram and Na+, K+, Mg2+//Cl-SO42-H2O pentabasic phase diagram, the chlorite and magnesium sulfate subtype have different hydro chemical characteristics and salting-in and salting-out rules.

scholarly journals Stability of ferroic phases in the highly piezoelectric Pb(ZrxTi1−x)O3ceramics

2007 ◽  
Vol 64 (1) ◽  
pp. 192-203 ◽  
Author(s):  
Dhananjai Pandey ◽  
Akhilesh Kumar Singh ◽  
Sunggi Baik
Keyword(s):  
Phase Diagram ◽  
Room Temperature ◽  
Physical Property ◽  
Rhombohedral Phase ◽  
Multiple Diffraction ◽  
Pzt Ceramics ◽  
X Ray ◽  
Space Groups ◽  
The Stability ◽  
New Phase

The morphotropic phase boundary in the phase diagram of the technologically important Pb(ZrxTi1−x)O3(PZT) ceramics has been traditionally believed to separate ferroelectric tetragonal and rhombohedral phase regions. This old picture has come under close scrutiny during the last eight years following the discovery of new monoclinic phases in theCmandCcspace groups. This article presents a brief overview of these discoveries in which the use of multiple diffraction probes (X-ray, electron, neutron diffraction) in conjunction with physical property measurements has played a crucial role. A new phase diagram of PZT showing the stability fields of these structures below room temperature is also presented.

scholarly journals FORMULATION AND CHARACTERIZATION OF TOPICAL NANO EMULGEL OF TERBINAFINE

2019 ◽  
Author(s):  
Sonia Paliwal ◽  
Gurleen Kaur
Keyword(s):  
Phase Diagram ◽  
Gelling Agent ◽  
Distilled Water ◽  
Physiochemical Properties ◽  
Dosing Frequency ◽  
First Pass Metabolism ◽  
First Pass ◽  
The Stability ◽  
Pass Metabolism

Terbinafine is a broad spectrum antifungal drug. The aim of present study was to develop topical nano emulgel of terbinafine using carbopol 934 as a gelling agent. The objective behind the formulation was to avoid dosing frequency and to increase the stability and bioavailability by avoiding the first pass metabolism. The formulations were prepared by using oleic acid, carbopol 934, span 20, propylene glycol in different ratios and analyzed by pseudo tertiary phase diagram. All the five prepared nano emulgel formulations have shown satisfactory physiochemical properties. The stability and particle size is been determined by zeta potential. The highest drug release 82.38 %was found in formulations of batch F4, which follows non-fickian mechanism. The studies showed that changing the concentration of oil, surfactant, co surfactant and double distilled water as aqueous phase has an impact on the behavior and thermodynamic stability of the nanoemulsion. Study concludes that of Terbinafine can be deliverered effectively by nano emulgel  formulations.

scholarly journals Information storage in permalloy modulated magnetic nanowires

2021 ◽  
Author(s):  
Guidobeth Sáez ◽  
Pablo Díaz ◽  
Eduardo Cisternas ◽  
Eugenio E. Vogel ◽  
Juan Escrig
Keyword(s):  
Magnetic Material ◽  
Phase Diagram ◽  
Magnetic Fields ◽  
Domain Walls ◽  
Wire Diameter ◽  
Information Storage ◽  
Magnetic Nanowires ◽  
The Wire ◽  
The Stability ◽  
Cylindrical Wire

Abstract A long piece of magnetic material shaped as a central cylindrical wire (diameter d = 50 nm) with two wider coaxial cylindrical portions (diameter D = 90 nm and thickness t = 100 nm) defines a bimodulated nanowire. Micromagnetism is invoked to study the equilibrium energy of the system under the variations of the positions of the modulations along the wire. The system can be thought of as composed of 5 independent elements (3 segments and 2 modulations) leading to 25 = 32 different magnetic configurations. We investigate the stability of the configurations depending on the positions of the modulations. The relative chirality of the modulations has negligible contributions to the energy and they have no effect in the stability of the stored configuration. However, the modulations are extremely important in pinning the domain walls that lead to consider each segment as independent from the rest. A phase diagram reporting the stability of the inscribed magnetic configurations is produced. The stability of the system was then tested under the action of external magnetic fields and it is found that more than 50 mT are necessary to alter the inscribed information. The main purpose of this paper is to find weather a prototype like this can complemented to be used as firmware or magnetic keys. Present results indicate that this is feasible.

Fragility of Chaos in Multispecies Competition Influenced by Predation

2010 ◽  
Author(s):  
Lei Zhao ◽  
Huayong Zhang ◽  
Tousheng Huang ◽  
Xinqiang Zhu ◽  
Lu Han
Keyword(s):  
Phase Diagram ◽  
Numerical Simulations ◽  
Strange Attractor ◽  
Stable Equilibrium ◽  
Dynamical Model ◽  
Nonlinear Dynamical ◽  
Nonlinear Dynamical Model ◽  
The Stability ◽  
Multispecies Competition

In order to study the stability of chaotic behaviors, a nonlinear dynamical model of the competing multispecies with a predator is investigated. A series of numerical simulations is demonstrated via wave diagram and phase diagram. The results show that the chaos can change into either oscillation or ordinary equilibrium as the attacking rate of the predator increases. Moreover, chaos in the system becomes fragile and even vanishes when the attacking rate reaches 0.0186. This study also exhibits the transformation in phase diagram from a strange attractor to a stable equilibrium.

scholarly journals STABILITY OF AdS BLACK STRINGS

2009 ◽  
Vol 24 (08n09) ◽  
pp. 1514-1517
Author(s):  
TÉRENCE DELSATE
Keyword(s):  
Phase Diagram ◽  
Stability Problem ◽  
Black String ◽  
Black Strings ◽  
The Stability

We review the recent developements in the stability problem and phase diagram for asymptotically locally AdS black strings. First, we quickly review the case of locally flat black string before turning to the case of locally AdS spacetimes.

Preparation and Characterization of Anti-HIV Drug TD0232-Loaded Microemulsion

2011 ◽  
Vol 236-238 ◽  
pp. 2825-2829
Author(s):  
Hong Jing Zhou ◽  
Qiang Xia ◽  
Xing Mu Guo
Keyword(s):  
Phase Diagram ◽  
Quality Evaluation ◽  
Entrapment Efficiency ◽  
Loading Capacity ◽  
Electronic Microscopy ◽  
Mean Size ◽  
The Stability ◽  
Anti Hiv ◽  
Pseudoternary Phase Diagram

The objective is to study the preparation of TD0232-loaded microemulsion (TD0232-ME) and its quality evaluation. The formulation was investigated by pseudoternary phase diagram. The loading capacity and entrapment efficiency was obtained by ultraviolet spectrophotometric method. The appearance，morphology，size distribution，stability of TD0232-ME were determined. The TD0232-ME，with good stability，was a transparent solution with visible sky-blue opalescence. TD0232-ME in transmission electronic microscopy (TEM) consisted of small spherical drops with a mean size of 30 - 50 nm. The UV analysis showed the loading capacity and encapsulated efficiency of TD0232-ME were 0.1% and 100%, respectively. The solubility of TD0232 was significantly increased in microemulsion and the stability was satisfying.

Sign in / Sign up

Export Citation Format

Share Document