Capacity When Using Diversity at Transmit and Receive Sites and the Rayleigh-faded Matrix Channel is Unknown at the Transmitter

2005 ◽  
pp. 253-267 ◽  
Author(s):  
G. J. Foschini ◽  
M. J. Gans
Keyword(s):  
Matrix Channel

Microstructure Evolution of a Single Crystal Superalloy after Tensile Fracture at Different Temperature

2013 ◽  
Vol 721 ◽  
pp. 262-265
Author(s):  
Zhen Xue Shi ◽  
Shi Zhong Liu ◽  
J. Yu ◽  
M. Han ◽  
J.R. Li
Keyword(s):  
Single Crystal ◽  
Microstructure Evolution ◽  
Stacking Faults ◽  
Single Crystal Superalloy ◽  
Tensile Fracture ◽  
Matrix Channel ◽  
Stress Orientation ◽  
Transmission Electron ◽  
Strength Behavior ◽  
The Matrix

The tensile property tests of DD6 single crystal superalloy were performed at 25°C, 760°C and 980°C in air. Detailed microstructure evolution was carried out on the alloy to illuminate the γ phase and dislocation structure after tensile fracture by scanning electron microscope and transmission electron microscopy. The results show that the alloy has the maximum tensile strength and the minimum plasticity at 760°C. DD6 alloy has the same anomalous yield strength behavior with other single crystal superalloys. The γ phase hasve a little extension in the stress orientation after tensile fracture at 25°C. The γ phase morphology still maintains cubic after tensile fracture at 760°C. The γ phase is no longer cubic and changes into rectangular solid in the specimen tensile ruptured at 980°C. The vertical γ matrix becomes thinner and horizontal γ matrix becomes thicker slightly. The γ phase is no longer cubic and changes into rectangular solid. High density dislocations are present in the matrix channels and a lot of superlattice stacking faults are seen within γ phases in the sample tested at 25°C. A large quantities of superlattice stacking faults within γ phase and a lot of dislocations tangling in matrix channel are all present in the sample tested at 760°C. The dislocation networks have homogeneously formed at γ/γ interface in the sample tested at 980°C.

A stochastic multi-antenna matrix channel model for efficient link-level simulations

2009 ◽  
Vol 20 (3) ◽  
pp. 355-369 ◽  
Author(s):  
Emanuela Falletti ◽  
Fabrizio Sellone
Keyword(s):  
Channel Model ◽  
Matrix Channel

scholarly journals Reconstruction of the flow structure in a matrix channel based on two-component LDA data

2021 ◽  
Vol 2127 (1) ◽  
pp. 012006
Author(s):  
M V Philippov ◽  
A V Zolotukhin ◽  
I A Chokhar ◽  
V V Terekhov ◽  
V I Terekhov ◽  
...  
Keyword(s):  
Turbulent Flows ◽  
Velocity Vector ◽  
Three Dimensional ◽  
Laser Doppler Anemometer ◽  
Dimensional Structure ◽  
Matrix Channel ◽  
Three Dimensional Structure ◽  
Two Component ◽  
Coplanar Channels ◽  
Using Data

Abstract The work is aimed at creating a technique for reconstructing the three-dimensional structure of turbulent flows using data of a two-component laser-Doppler anemometer at the example of a flow in flat coplanar channels. Data of paired measurements by a two-component LDA at two different angles relative to the measurement point are used to obtain information about the three-dimensional structure of the flow. Further, all three components of the velocity vector were calculated using transformations. The developed method is used to measure the velocity field in a coplanar channel.

Behavior of the "matrix channel -pressed monoliths" system during their heating

2020 ◽  
pp. 85-90
Author(s):  
V.V. Kuvshinov ◽  
N.V. Mukhanov ◽  
I.A. Telegin ◽  
S.A. Marchenko
Keyword(s):  
Matrix Channel ◽  
The Matrix

Local Heat/Mass Transfer and Friction Loss Measurement in a Rotating Matrix Cooling Channel

2009 ◽  
Author(s):  
In Taek Oh ◽  
Kyung Min Kim ◽  
Dong Hyun Lee ◽  
Jun Su Park ◽  
Hyung Hee Cho
Keyword(s):  
Mass Transfer ◽  
Sherwood Number ◽  
Heat Mass Transfer ◽  
Local Heat ◽  
Cooling Channel ◽  
Transfer Coefficients ◽  
Mass Transfer Coefficients ◽  
Matrix Channel ◽  
Rotation Numbers ◽  
The Matrix

The present investigation provides detailed local heat/mass transfer distribution and pressure drop characteristics in a matrix cooling channel under rotating conditions. The matrix channel has cooling sub-passages with crossing angle of 45 degrees. Detailed heat/mass transfer coefficients are measured using the naphthalene sublimation method. The pressure drops are also measured. The experiments were conducted under various Reynolds numbers (10,000 to 44,000) and rotation numbers (0.0 to 0.8). For the stationary case, the heat transfer characteristics are dominated by turning, impinging and swirling flow which are induced by the matrix channel geometry. Averaged heat/mass transfer coefficients on the leading and trailing surfaces in the stationary channel are approximately 2.1 times higher than those in a smooth channel. For the rotating cases, the effect of rotation on heat/mass transfer characteristics shows different tendency compared to typical rotating channels with radially outward flow. As the rotation number increases, the Sherwood number ratios increase on the leading surface, but changed slightly on the trailing surface. The thermal performance factors increases with increasing rotation numbers due to increased Sherwood number ratios and decreased friction factor ratios.

Fractographic Observation of Fatigue Crack Growth in Cast Ni3Al-Based Alloys

1990 ◽  
Vol 213 ◽  
Author(s):  
Yin Wanquan ◽  
Gao Wei ◽  
Zhu Yaoxiao
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Cracks ◽  
Fatigue Property ◽  
Fatigue Behaviour ◽  
Cyclic Stress ◽  
Alloying Elements ◽  
Propagation Path ◽  
Matrix Channel ◽  
Fractographic Observation

Fatigue behaviour of cast Ni3Al-based alloys with the addition of alloying elements, such as Hf, Zr and Ti etc., has been investigated. It was found that: (1) The alloying elements change remarkably mechanical property and fatigue property of cast Ni3Al-based alloys, in which, the fatigue strenghts of No.1 and No.2 alloys are 215.6MPa and 205.8MPa respectively, while that of No.3 alloy is only 78MPa, for the same cyclic life of 107; (2) Fatigue cracks initiate at the (γ'+γ) /γ interface and “matrix channel” in No.1 and No.2 alloys are at the grain-boundary or micropore, of No.3 alloy often fatigue cracks initiated from the edge of specimen under the cyclic stress; (3) Fbitigue crack propagation of cast Ni3Al-based alloys follows “zigzag” propagation path, and it proceeds through the big blocky (γ'+γ) eutectic and “matrix channel” and along the (γ';+γ)/γ interface in No.1 and No.2 alloys, while the fatigue crack propagation of No.3 alloy sometimes follows the “zigzag” propagation path. Finally, the effect of alloying elements on the fatigue behaviour of cast Ni3Al-based alloys has been discussed.

Research of Alloy Orb on Wavelet

2012 ◽  
Vol 503-504 ◽  
pp. 525-528
Author(s):  
Shu Zhang ◽  
Lei Meng
Keyword(s):  
Crystal Structure ◽  
Heat Treatment ◽  
High Temperature ◽  
Single Crystal ◽  
Dislocation Slip ◽  
Cubic Phase ◽  
Deformation Characteristics ◽  
Alloy Structure ◽  
Matrix Channel ◽  
The Matrix

via completely after heat-treatment, [111] orientation of single crystal alloy structure is still cubic  phase at way coherency are ordered in matrix g panel and the direction rules arrangement; In high temperature and tensile stress creep period, with stress axes ordered  has formed certain Angle raft shape organization, creep later in nearly fracture zone, raft shape  ordered caring and distortion in happen, with strain increases, coarsening and distorted aggravating, until the present wavy shape; During the creep [111] orientation of single crystal alloys deformation characteristics is a wrong in  matrix channel to sports and shear raft shape  phase, due to form larger, more variable dislocation cut ordered after raft shape , occurred in dislocation bunch of sets and its formation and crystal structure; Among them, the matrix channel to inherit the maximum shear dislocation slip is made of alloy with larger strain rate main reason.

scholarly journals Experimental study of the three-dimensional flow structure in matrix channels

2021 ◽  
Vol 2057 (1) ◽  
pp. 012027
Author(s):  
M V Philippov ◽  
I A Chokhar ◽  
A V Zolotukhin ◽  
A V Barsukov ◽  
V V Terekhov ◽  
...  
Keyword(s):  
Experimental Study ◽  
Three Dimensional ◽  
Decisive Role ◽  
Three Dimensional Flow ◽  
Matrix Channel ◽  
Dimensional Flow ◽  
The Matrix ◽  
Role Based ◽  
High Degree

Abstract The article presents an experimental study of the turbulent flow in matrix channels. Using the modern optical contactless laser Doppler anemometer (LDA) method, an idea of the turbulent three-dimensional flow inside the cells of matrix channels is developed. The results of the study of the matrix channel show that the so-called vortex matrix effect is not formed. The most important factor that causes a high degree of heat transfer from the walls is the intense spiral motion between the matrix cells. The measurements also show that the effects associated with the lateral boundaries of the channel play a significant role. Based on the assumption of the decisive role of the spiral flow between the cells of the matrix channel, a formula for the integral pressure loss is proposed.

Numerical Analysis on the Shape of Ribs for Enhancing Heat Transfer in Matrix Channel

2019 ◽  
Vol 43 (5) ◽  
pp. 329-337
Author(s):  
Hyoung Min Lee ◽  
Seok Min Choi ◽  
Minho Bang ◽  
Taehyun Kim ◽  
Won-Gu Joo ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Numerical Analysis ◽  
Matrix Channel ◽  
Enhancing Heat Transfer
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