New Experimental Results on the Phase Diagram of Boron Nitride

2000 ◽  
Vol 154 (1) ◽  
pp. 280-285 ◽  
Author(s):  
G. Will ◽  
G. Nover ◽  
J. von der Gönna
Keyword(s):  
Phase Diagram ◽  
Boron Nitride ◽  
Experimental Results

Constructing Keyed Strong S-Box Using an Enhanced Quadratic Map

2021 ◽  
Vol 31 (10) ◽  
pp. 2150146
Author(s):  
Yuanyuan Si ◽  
Hongjun Liu ◽  
Yuehui Chen
Keyword(s):  
Phase Diagram ◽  
Fixed Point ◽  
Lyapunov Exponent ◽  
Uniform Distribution ◽  
Bifurcation Diagram ◽  
Experimental Results ◽  
Kolmogorov Entropy ◽  
Symmetric Cryptography ◽  
Quadratic Map ◽  
Nonlinear Component

As the only nonlinear component for symmetric cryptography, S-Box plays an important role. An S-Box may be vulnerable because of the existence of fixed point, reverse fixed point or short iteration cycles. To construct a keyed strong S-Box, first, a 2D enhanced quadratic map (EQM) was constructed, and its dynamic behaviors were analyzed through phase diagram, Lyapunov exponent, Kolmogorov entropy, bifurcation diagram and randomness testing. The results demonstrated that the state points of EQM have uniform distribution, ergodicity and better randomness. Then a keyed strong S-Box construction algorithm was designed based on EQM, and the fixed point, reverse fixed point, and short cycles were eliminated. Experimental results verified the algorithm’s feasibility and effectiveness.

Extension of the cubic boron nitride thin film growth phase diagram

2012 ◽  
Vol 22 ◽  
pp. 88-91 ◽  
Author(s):  
S. Weidner ◽  
S. Geburt ◽  
S. Milz ◽  
J. Ye ◽  
S. Ulrich ◽  
...  
Keyword(s):  
Thin Film ◽  
Phase Diagram ◽  
Boron Nitride ◽  
Growth Phase ◽  
Film Growth ◽  
Cubic Boron Nitride ◽  
Thin Film Growth

ChemInform Abstract: Refined Phase Diagram of Boron Nitride.

ChemInform ◽  
2010 ◽  
Vol 30 (27) ◽  
pp. no-no
Author(s):  
Vladimir L. Solozhenko ◽  
Vladimir Z. Turkevich ◽  
Wilfried B. Holzapfel
Keyword(s):  
Phase Diagram ◽  
Boron Nitride

The phase diagram (p, T, E) of boron nitride

1986 ◽  
Vol 76 (2) ◽  
pp. 511-513 ◽  
Author(s):  
A. Sokołowska ◽  
M. Wronikowski
Keyword(s):  
Phase Diagram ◽  
Boron Nitride

Realization of a Novel Logarithmic Chaotic System and Its Characteristic Analysis

2019 ◽  
Vol 29 (02) ◽  
pp. 1930004 ◽  
Author(s):  
Xiaoyuan Wang ◽  
Xiaotao Min ◽  
Jun Yu ◽  
Yiran Shen ◽  
Guangyi Wang ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Lyapunov Exponent ◽  
Theoretical Analysis ◽  
Chaotic System ◽  
Nonlinear Term ◽  
Experimental Results ◽  
Characteristic Analysis ◽  
Chaotic Parameter ◽  
Hardware Circuit ◽  
Lyapunov Exponent Spectrum

To further improve the complexity of the chaotic system and broaden the chaotic parameter range, a novel logarithmic chaotic system was constructed by adding a nonlinear term of logarithm. The dynamic characteristics of the chaotic system were analyzed by chaotic phase diagram, bifurcation diagram, Lyapunov exponent spectrum, Poincaré mapping and dynamical map, etc. The system was digitized by DSP simulation, and the corresponding experimental results are completely consistent with the theoretical analysis. Furthermore, the equivalent hardware circuit was designed and theoretical analysis was verified by its experimental results.

Magnetic Properties and Phase Diagram of Quasi-two-dimensional Na2Co2TeO6 Single Crystal Under High Magnetic Field

2021 ◽  
Author(s):  
Guiling Xiao ◽  
Zhengcai Xia ◽  
Yujie Song ◽  
Lixia Xiao
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Phase Diagram ◽  
Magnetic Phase ◽  
Magnetic Coupling ◽  
Experimental Results ◽  
Antiferromagnetic Coupling ◽  
Magnetic Field Direction ◽  
Antiferromagnetic Ordering ◽  
The Magnetic Field

Abstract We investigated the magnetic characteristics of Na2Co2TeO6 at different temperatures and magnetic field. The experimental results indicated that the magnetic field can disturb the antiferromagnetic interaction and lead to the disorder. Magnetization curves measured with different angles θ (θ is between the magnetic field direction and c axis) express the magnetocrystalline anisotropy in this system. when the angle θ=0 (magnetic field parallel to c axis), two continuous magnetic phase transitions at critical temperature TN1 and TN3 were observed. As θ changes, TN1 is almost independent on θ, indicating the magnetic ordering at TN1 was a spontaneous behavior with a robust AFM characteristic. On the other hand, as θ increases from 0 to 180, TN3 presents extreme value at θ=90 (magnetic field perpendicular to c axis). It indicates that TN3 were sensitive to temperature and magnetic fields. At some angles closing to ab plane, an additional phase transition was observed at TN2. This phase transition at TN2 may mainly result from the long range antiferromagnetic ordering within ab-plane. Furthermore, the magnetization measurement up to 50 T revealed the strong antiferromagnetic coupling in the system, and in which the magnetic coupling within the honeycomb layers is strong and the magnetic coupling interaction between honeycomb layers is weaker. Based on the experimental results, we have obtained the complete magnetic phase diagram.

scholarly journals Experimental Study on the Effect of CO2 on Phase Behavior Characteristics of Condensate Gas Reservoir

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Dali Hou ◽  
Ying Jia ◽  
Yunqing Shi ◽  
Rui Zhao ◽  
Hongming Tang ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Experimental Study ◽  
Phase Behavior ◽  
Experimental Results ◽  
Dew Point ◽  
Gas Reservoirs ◽  
Two Phase ◽  
Extraction Capacity ◽  
Gas System ◽  
Behavior Characteristics

In this paper, the DBR all-visible mercury-free high-temperature and high-pressure multifunctional formation fluid PVT analyzer developed and produced by Schlumberger company is used to conduct an experimental study on phase behavior characteristics of one offshore high CO2 condensate gas wells. The experiments include two-phase flash experiment, constant composition expansion experiment (CCE experiment), and constant volume depletion experiment (CVD experiment). Experimental results show that the higher the CO2 content in the condensate gas system, the higher the gas-oil ratio of condensate gas, the greater the density of condensate oil, the higher the dew point pressure of condensate gas, the greater the relative volume of condensate gas, the smaller the amount of retrograde condensate oil. And the higher the CO2 content in the condensate gas system, the phase diagram is shifted to the left and up, the critical point of the phase diagram is shifted to the lower left, the smaller the area of the two-phase envelope, the lighter the condensate gas system, the condensate oil recovery is higher. The above experimental results revealed that CO2 is well soluble with condensate gas, the expansion capacity of the condensate gas system was slightly enhanced, and because CO2 has a good extraction capacity, the light components of condensate gas were constantly extracted, the retrograde condensate rate of condensate oil decreases, and the maximum retrograde condensate volume also decreased. However, the condensate oil was produced along with the natural gas, and the higher the CO2 content, the stronger the extraction, the more condensate oil was produced. It is mainly because CO2 has the strong gasification and extraction capacity, on the one hand, the retrograde condensation of condensate gas was inhibited, and on the other hand, reverse evaporation of condensate oil was enhanced. The above experimental results indicate the law of the effect of CO2 on the phase behavior characteristics of condensate gas reservoirs, providing theoretical basis and guidance for the efficient development of condensate gas reservoirs at sea.

Titanium-Aluminide Alloys Between the Compositions Ti3 Al and TiAl

1988 ◽  
Vol 133 ◽  
Author(s):  
J. C. Mishurda ◽  
J. C. Lin ◽  
Y. A. Chang ◽  
J. H. Perepezko
Keyword(s):  
Phase Diagram ◽  
High Temperature ◽  
Phase Equilibria ◽  
Titanium Aluminide ◽  
High Temperature Phase ◽  
Experimental Results ◽  
Temperature Phase ◽  
Titanium Aluminum Alloys ◽  
Gibbs Energies ◽  
Schottky Type

ABSTRACTMany questions still remain about the Ti-Al phase diagram, particularly for the compositions between the intermetallic compounds Ti3Al and TiAl. In an experimental study of the phase equilibria, titanium-aluminum alloys with 44, 46, 48, 50 at.% aluminum were produced by drop casting, HIP, and a double forging process method. Differential thermal analysis (DTA), optical metallography, and residual oxygen analysis were performed in order to characterize the low and high temperature phase equilibria of the alloys. The experimental results are compared with the calculated Ti-Al phase diagram which is being modeled concurrently. For the bcc, hcp and liquid phases, the Margules type of equations are used to represent the excess Gibbs energies. A maximum of six parameters are used for each of the phases. For the TiAl (Llo) and Ti3Al (D019 ) phases, the Wagner-Schottky type of equations are used to represent the Gibbs energies. All of the other phases are treated as line compounds. Values of the solution parameters were obtained by optimization using existing thermochemical and phase boundary data reported in the literature. The calculated results show that the high temperature hcp phase field is stable between approximately 34 at% Al, in equilibrium with β and α2 up to about 48 at% Al in equilibrium with γ and L and forms from the liquid by a peritectic reaction β+L-α. The experimental results obtained to date for the four alloys are consistent with the calculated equilibria which is being refined and also allows for an estimate of the metastable equilibria.

Sign in / Sign up

Export Citation Format

Share Document