Reconfigurable and Adaptive Antennas Using Materials with Variable Conductivity

2007 ◽  
Author(s):  
R.L. Haupt ◽  
J.R. Flemish
Keyword(s):  
Adaptive Antennas ◽  
Variable Conductivity

Controlled Injection of Holes into ALQ3 Based Oleds by Means of An Oxidized Transport Layer

2001 ◽  
Vol 708 ◽  
Author(s):  
Mathew K. Mathai ◽  
Keith A. Higginson ◽  
Bing R. Hsieh ◽  
Fotios Papadimitrakopoulos
Keyword(s):  
Indium Tin Oxide ◽  
Oxidative Degradation ◽  
Transport Layer ◽  
Hole Injection ◽  
Carrier Injection ◽  
Salt Loading ◽  
Light Emitting ◽  
Hole Transporting ◽  
Intrinsic Degradation ◽  
Variable Conductivity

ABSTRACTIn this paper we report a method for tuning the extent of hole injection into the active light emitting tris- (8-hydroxyquinoline) aluminum (Alq3) layer in organic light emitting diodes (OLEDs). This is made possible by modifying the indium tin oxide (ITO) anode with an oxidized transport layer (OTL) comprising a hole transporting polycarbonate of N,N'-bis(3-hydroxymethyl)-N,N'-bis(phenyl) benzidine and diethylene glycol (PC-TPB-DEG) doped with varying concentrations of antimonium hexafluoride salt of N,N,N',N'-tetra-p-tolyl-4,4'-biphenyldiamine (TMTPD+ SbF6-). The conductivity of the OTL can be changed over three orders of magnitude depending on salt loading. The analysis of hole and electron current variations in these devices indicates that optimizing the conductivity of the OTL enables the modulation of hole injection into the Alq3 layer. The bipolar charge transport properties for OLEDs in which the interfacial carrier injection barriers have been minimized, are governed by the conductivities of the respective layers and in this case it is shown that the variable conductivity of the OTL does allow for better control of the same. Accordingly, varying the concentration of holes in the device indicates that beyond an optimum concentration of holes, further hole injection results in the formation of light quenching cationic species and the initiation of oxidative degradation processes in the Alq3 layer, thus accelerating the intrinsic degradation of these devices. The variable conductivity of the OTL can hence be used to minimize the occurrence of these processes.

Single and multiple cell deployment of adaptive antennas with CDMA

1998 ◽  
Vol 34 (23) ◽  
pp. 2196 ◽  
Author(s):  
G.V. Tsoulos
Keyword(s):  
Adaptive Antennas ◽  
Multiple Cell

Ericsson/Mannesmann GSM field-trials with adaptive antennas

2002 ◽  
Author(s):  
S. Anderson ◽  
U. Forssen ◽  
J. Karlsson ◽  
T. Witzschel ◽  
P. Fischer ◽  
...  
Keyword(s):  
Field Trials ◽  
Adaptive Antennas

Linearization of Sparrow and Koopman’s Method for Heat Transfer with Variable Conductivity

1972 ◽  
Vol 48 (1) ◽  
pp. 121-122 ◽  
Author(s):  
Marc Dixmier
Keyword(s):  
Heat Transfer ◽  
Variable Conductivity

scholarly journals Transient thermal conduction with variable conductivity using the Meshless Local Petrov–Galerkin method

2016 ◽  
Vol 272 ◽  
pp. 676-686 ◽  
Author(s):  
N.P. Karagiannakis ◽  
G.C. Bourantas ◽  
A.N. Kalarakis ◽  
E.D. Skouras ◽  
V.N. Burganos
Keyword(s):  
Galerkin Method ◽  
Thermal Conduction ◽  
Transient Thermal ◽  
Variable Conductivity
Sign in / Sign up

Export Citation Format

Share Document