Ablation behavior of sharp leading edge parts made of rare earth La-compound modified ZrB2 coated C/C composites

2020 ◽  
Vol 175 ◽  
pp. 108895 ◽  
Author(s):  
Bo Li ◽  
Hejun Li ◽  
Xiyuan Yao ◽  
Yigao Chen ◽  
Xu Hu ◽  
...  
Keyword(s):  
Rare Earth ◽  
Leading Edge ◽  
Sharp Leading Edge ◽  
Rare Earth La

Application Of Elastic Layers To Register Pressure Field On The Model Surface In Supersonic Flow

2016 ◽  
Vol 11 (1) ◽  
pp. 23-33
Author(s):  
Maxim Golubev ◽  
Andrey Shmakov
Keyword(s):  
Surface Waves ◽  
High Frequency ◽  
High Speed ◽  
Pressure Pulsation ◽  
Pressure Field ◽  
Leading Edge ◽  
Supersonic Wind Tunnel ◽  
Register Pressure ◽  
Elastic Layers ◽  
Sharp Leading Edge

The work presents the results of application of panoramic interferential technique which is based on elastic layers (sensors) usage to obtain pressure distribution on the flat plate having sharp leading edge. Experiments were done in supersonic wind tunnel at Mach number M = 4. Sensitivity and response time are shown to be enough to register pressure pulsation against standing and traveling sensor surface waves. Applying high-frequency image acquiring is demonstrated to make possible to distinguish at visualization images high-speed disturbances propagating in the boundary layer from low-speed surface waves

Enhancing electrocatalytic nitrogen reduction to ammonia with rare earth (La, Y, Sc) on high-index faceted platinum alloy concave nanocubes

2021 ◽  
Author(s):  
Yu-Jie Mao ◽  
Feng Liu ◽  
You-Hu Chen ◽  
Xin Jiang ◽  
Xinsheng Zhao ◽  
...  
Keyword(s):  
Rare Earth ◽  
Surface Structure ◽  
Catalyst Surface ◽  
High Index ◽  
Structure Effect ◽  
Structure Dependence ◽  
Nitrogen Reduction ◽  
Platinum Alloy ◽  
Atomic Arrangement ◽  
Rare Earth La

Surface structure effect is the key subject in electrocatalysis, and consists of the structure dependence of interaction between reaction molecules and catalyst surface in specifying the surface atomic arrangement, chemical...

Optimal rare-earth (La, Y and Sm) doping conditions and enhanced mechanism for photocatalytic application of ceria nanorods

2021 ◽  
Vol 32 (19) ◽  
pp. 195708
Author(s):  
Xuewen Xia ◽  
Junqi Li ◽  
Chaoyi Chen ◽  
Yuan-Pei Lan ◽  
Xisong Mao ◽  
...  
Keyword(s):  
Rare Earth ◽  
Photocatalytic Application ◽  
Rare Earth La

THE STUDY OF HIGH DIELECTRIC CONSTANT MECHANISM OF La-DOPED Ba0.67Sr0.33TiO3 CERAMICS

2018 ◽  
Vol 25 (02) ◽  
pp. 1850056
Author(s):  
JING XU ◽  
BO HE ◽  
HAN XING LIU
Keyword(s):  
Dielectric Constant ◽  
Rare Earth ◽  
High Dielectric Constant ◽  
Temperature Stability ◽  
Current Voltage ◽  
Microstructure Model ◽  
Bst Ceramics ◽  
High Dielectric ◽  
Rare Earth La ◽  
La Doped

It is a common and effective method to enhance the dielectric properties of BST ceramics by adding rare-earth elements. In this paper, it is important to analyze the cause of the high dielectric constant behavior of La-doped BST ceramics. The results show that proper rare earth La dopant ([Formula: see text]) may greatly increase the dielectric constant of BST ceramics, and also improve the temperature stability, evidently. According to the current–voltage ([Formula: see text]–[Formula: see text]) characteristics, the proper La-doped BST ceramics may reach the better semiconductivity, with the decrease and increase in La doping, the ceramics are insulators. By using the Schottky barrier model and electric microstructure model to find the surface or grain boundary potential barrier height, the width of the depletion layer and grain size do play an important role in impacting the dielectric constant.

Flow in the initial segment of a tube with a sharp leading edge

1989 ◽  
Vol 56 (2) ◽  
pp. 140-143 ◽  
Author(s):  
V. M. Legkii ◽  
V. A. Rogachev
Keyword(s):  
Initial Segment ◽  
Leading Edge ◽  
Sharp Leading Edge

Electrical and Raman Spectroscopic Studies on Aurivillius Layered-Pervoskite Ceramics

2019 ◽  
Vol 1154 ◽  
pp. 80-90
Author(s):  
Mohammed Abdul Basheer ◽  
Vagmare Gangadhar ◽  
Guduru Prasad ◽  
Gobburu Subramanya Kumar ◽  
Nandi Venkata Prasad
Keyword(s):  
Rare Earth ◽  
Complex Impedance ◽  
Spectroscopic Properties ◽  
Spectroscopic Studies ◽  
Rare Earth Ions ◽  
X Ray Diffraction ◽  
Raman Spectroscopic ◽  
Solid State Route ◽  
A Site ◽  
Rare Earth La

Double rare-earth (La; Sm/Gd) substituted Aurivillius family of Bismuth Layered Structured Ferroelectrics (BLSF) namely Bi2.6Sm0.2La0.2TiNbO9 (BSLT; sample-A), Bi2.6Gd0.2La0.2TiNbO9 (BGLT; sample-B), single phase ceramics were prepared by solid state route. In addition, intergrowth (x BSLT - (1-x) BGLT, where x=0.49; sample-C) and solid solution (BSLT­x - BGLTy; where x + y=0.4; sample-D) materials were prepared. Dielectric, ferroelectric and Raman spectroscopic properties were studied on the said above materials. The X-ray diffraction analysis and Raman spectra revealed well-formation of stable structure. Though, the sample-C and sample-D have lower coercive field, compared to the sample-A and sample-B, but they exhibited sharp hysterisis loop. Therefore the instrinsic defects of sample-D inhabits more sensitivity towards the ferroelectric behaviour. The results were corroborated to the impedance and dielectrical data. The results were consistent with the SEM micrographs and complex impedance plots. An attempt is made to understand the effect of rare-earth ions on A-site of layered-pervoskite structure, defined as: (Bi2O2)2+(An-1BnO3n+1)2-.The term n represents number of pervoskite blocks interleaved with the bismuth oxide layers.

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