scholarly journals Understanding TADF: a joint experimental and theoretical study of DMAC-TRZ

2021 ◽  
Vol 23 (1) ◽  
pp. 378-387
Author(s):  
Rama Dhali ◽  
D. K. Andrea Phan Huu ◽  
Francesco Bertocchi ◽  
Cristina Sissa ◽  
Francesca Terenziani ◽  
...  
Keyword(s):  
Environmental Effects ◽  
Theoretical Study ◽  
The Matrix

TADF offers a promising way to harvest triplets in OLED for improved efficiency. To concurrently optimize the dye inside the matrix, a thorough experimental and theoretical study is presented of a the TADF dye addressing environmental effects.

scholarly journals Modelling and analysis of a NTVV-SVM based three-level twin-step matrix converter

2018 ◽  
Vol 7 (4) ◽  
pp. 2672
Author(s):  
Shamsher Ansari ◽  
Aseem Chandel ◽  
SMIEEE . ◽  
Zulfiqar Ali Sheikh
Keyword(s):  
High Power ◽  
Theoretical Study ◽  
Matrix Converter ◽  
Matrix Converters ◽  
Output Performance ◽  
The Matrix ◽  
Power Switches ◽  
Converter Topology ◽  
Vector Modulation ◽  
Ac Converters

Recently the tremendous advancement has been seen in the field of matrix converter topology. For high power drive applications, industries often need high power AC-AC converters like three level matrix converter because it is having the ability to generate a set of balanced sine waves for inputs as well as outputs. The three level matrix converters possess better output performance with reduced harmonic contents compared to all two-stage indirect matrix converters. In this matrix converter topology, the idea of neutral-point clamped-VSI is employed to the inversion step of the matrix converter circuitry. To control the power switches the gate signals are produced using NTVV based space vector modulation. To justify the theoretical study a complete model of a three-level twin-step matrix converter has been designed in Matlab/Simulink and its performances are analysed.  

scholarly journals Терагерцовая спектроскопия магнитоэлектрика HoAl-=SUB=-3-=/SUB=-(BO-=SUB=-3-=/SUB=-)-=SUB=-4-=/SUB=-

2022 ◽  
Vol 130 (1) ◽  
pp. 59
Author(s):  
А.М. Кузьменко ◽  
В.Ю. Иванов ◽  
А.Ю. Тихановский ◽  
А.Г. Пименов ◽  
А.М. Шуваев ◽  
...  
Keyword(s):  
Crystal Field ◽  
Excited States ◽  
Ground State ◽  
Theoretical Study ◽  
Low Frequency ◽  
Local Symmetry ◽  
Matrix Elements ◽  
The Matrix ◽  
Excitation Conditions ◽  
Ground Multiplet

Experimental and theoretical study of submillimeter (terahertz) spectroscopic and magnetic properties of the rare-earth aluminum borate HoAl3(BO3)4 were performed at temperatures 3–300 K. In the transmittance spectra a number of resonance lines were detected at frequencies 2–35 cm–1 for different radiation polarizations. These modes were identified as transitions between the lower levels of the ground multiplet of the Ho3+ ion split by the crystal field, including both transitions from the ground state to the excited ones and transitions between the excited states. The established excitation conditions of the observed modes and the simulation of the spectra made it possible to separate the magnetic and electric dipole transitions and to determine the energies of the corresponding states, their symmetry, and the matrix elements of the transitions. Low-frequency lines that do not fit into the established picture of the electron states of Ho3+ were also found; these lines, apparently, correspond to the ions with the distorted by defects local symmetry of the crystal field.

scholarly journals Basic Comparison And Evaluation Of Functionality AC-AC Matrix Converter Concepts For HEV Vehicle - Part I

2020 ◽  
Vol 22 (1) ◽  
pp. 77-83
Author(s):  
Branislav Dobrucky ◽  
Slavomir Kascak ◽  
Michal Prazenica ◽  
Roman Konarik
Keyword(s):  
Electric Vehicle ◽  
Hybrid Electric Vehicle ◽  
Theoretical Study ◽  
Matrix Converter ◽  
Pwm Rectifier ◽  
Power Performance ◽  
The Matrix ◽  
Full Power ◽  
Hybrid Electric

The paper deals with the direct AC-AC propulsion system and compares two matrix converter concepts with fivephase traction induction motors (IM) for the hybrid electric vehicle (HEV) including electronic differential. The first one consists of [3x5] matrix converter and [3x1] active PWM rectifier (4Q-converter) for full power performance. The second one comprises one [3x5] matrix converter for full power and auxiliary [0x5] matrix converter for partial output power. Configurations of [3x5] + [0x5] MxC converters with five-phase motor(s) are not analyzed in available literature so far. The advantage of the proposed connection is in supposed higher efficiency of matrix converter then clasiccal VSI one. Part I deals with a theoretical study of converter concepts for hybrid electric vehicle. Based on simulation results the comparison and evaluation of the property and quality of the quantities of different type of the matrix powertrain are discussed in Part II.

Forced Convection in a Duct Partially Filled With a Porous Material

1987 ◽  
Vol 109 (3) ◽  
pp. 653-662 ◽  
Author(s):  
D. Poulikakos ◽  
M. Kazmierczak
Keyword(s):  
Forced Convection ◽  
Flow Model ◽  
Theoretical Study ◽  
Porous Matrix ◽  
Parallel Plates ◽  
Constant Wall Temperature ◽  
Porous Region ◽  
The Matrix ◽  
Constant Wall Heat Flux ◽  
Channel Configuration

This paper presents a theoretical study of fully developed forced convection in a channel partially filled with a porous matrix. The matrix is attached at the channel wall and extends inward, toward the centerline. Two channel configurations are investigated, namely, parallel plates and circular pipe. For each channel configuration, both the case of constant wall heat flux and constant wall temperature were studied. The main novel feature of this study is that it takes into account the flow inside the porous region and determines the effect of this flow on the heat exchange between the wall and the fluid in the channel. The Brinkman flow model which has been proven appropriate for flows in sparsely packed porous media and for flows near solid boundaries was used to model the flow inside the porous region. Important results of engineering interest were obtained and are reported in this paper. These results thoroughly document the dependence of the Nusselt number on several parameters of the problem. Of particular importance is the finding that the dependence of Nu on the thickness of the porous layer is not monotonic. A critical thickness exists at which the value of Nu reaches a minimum.

Metal ion attachment to the matrix meso-tetrakis(pentafluorophenyl)porphyrin, related matrices and analytes: an experimental and theoretical study

2009 ◽  
Vol 44 (11) ◽  
pp. 1556-1564 ◽  
Author(s):  
Jeroen J. A. van Kampen ◽  
Theo M. Luider ◽  
Paul J. A. Ruttink ◽  
Peter C. Burgers
Keyword(s):  
Metal Ion ◽  
Theoretical Study ◽  
The Matrix ◽  
Ion Attachment

Theoretical study on adsorption characteristics and environmental effects of dimetridazole on TiO2 surface

2019 ◽  
Vol 1150 ◽  
pp. 10-17 ◽  
Author(s):  
Hai-Chuan Qin ◽  
Qiao-Qiao Qin ◽  
Hui Luo ◽  
Wei Wei ◽  
Liu-Xie Liu ◽  
...  
Keyword(s):  
Environmental Effects ◽  
Theoretical Study ◽  
Tio2 Surface ◽  
Adsorption Characteristics

THE INFLUENCE OF ENVIRONMENTAL EFFECTS ON THE ACOUSTIC PHONON SPECTRA IN QUANTUM-DOT HETEROSTRUCTURES

2002 ◽  
Vol 12 (04) ◽  
pp. 1147-1158 ◽  
Author(s):  
SALVADOR RUFO ◽  
MITRA DUTTA ◽  
MICHAEL A. STROSCIO
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Environmental Effects ◽  
Phonon Spectrum ◽  
Acoustic Phonon ◽  
Matrix Material ◽  
Free Standing ◽  
Phonon Spectra ◽  
The Matrix ◽  
Selection Of

We present calculations of the acoustic phonon spectra for a variety of quantum dots and consider the cases where the quantum dots are both free-standing and embedded in a selection of different matrix materials — including semiconductors, plastic, and water. These results go beyond previous calculations for free-standing quantum dots and demonstrate that the matrix material can have a large effect on the acoustic phonon spectrum and consequently on a variety of phonon-assisted transitions in quantum-dot heterostructures.

scholarly journals Basic Comparison and Evaluation of Functionality AC-AC Matrix Converter Concepts for HEV Vehicle - Part II

2020 ◽  
Vol 22 (2) ◽  
pp. 73-78
Author(s):  
Branislav Dobrucky ◽  
Slavomir Kascak ◽  
Michal Prazenica ◽  
Roman Konarik
Keyword(s):  
Electric Vehicle ◽  
Hybrid Electric Vehicle ◽  
Theoretical Study ◽  
Induction Motors ◽  
Matrix Converter ◽  
Matrix Converters ◽  
The Matrix ◽  
Simulation Results ◽  
Hybrid Electric

The paper deals with a modeling and simulation of the direct AC-AC propulsion system and compares two matrix converter concepts with five-phase traction induction motors (IM) for the hybrid electric vehicle (HEV). The simulation results of [3x5] matrix converter and 4Q-converter are done using Matlab-Simulink environment. Part I deals with a theoretical study of converter concepts for hybrid electric vehicle, since the configurations of [3x5]+[0x5] matrix converters with five-phase motor(s) have not been analyzed so far. Based on simulation results the comparison and evaluation of the property and quality of the quantities of different type of the matrix powertrain are discussed in Part II.

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