Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 25 for “"charge balance"”.
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Development of a combined multi-sensor/signal processing architecture for improved in-situ quantification of the charge balance of natural waters
… chemical relationships, i.e., the concept of charge balance and the total ion-conductivity relationship. Two experiments are conducted using environmentally-relevant data sets (one semi-synthetic, one created in the lab) to characterize the eectiveness of the proposed ANN architecture. Final …
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Charge Carrier Balance in Lead Halide Perovskite Light Emitting Diodes
Charge balance in light emitting diodes (LEDs) is a critical determinant of their performance. Charge balance is directly related to the External Quantum Efficiency (EQE), and is thought to have additional effects on device endurance and stability. In this thesis I present a series of experiments …
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Charges and Excitons in Organic and Pervoskite Light Emitting Materials and Devices
Charge balance in organic light emitting structures is essential to simultaneously achieving high brightness and high efficiency. In DC-driven OLEDs, this is relatively straight forward. However, in the newly emerging, capacitive, field-activated AC-driven organic devices, charge balance can be a …
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Surface and interface engineering in quantum dot and double-heterojunction nanorod light-emitting diodes
… developing these high performance QD-LEDs is the charge balance in these devices. Since the valence band edges of CdSe and the typical shell materials (CdS or ZnS) are significantly lower than those of available organic hole transport materials, the band alignment in most CdSe-based QD-LEDs …
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De Novo Heme Protein Design
… is as hydrophobic as the fourth helix of OR, charge neutralization of metal ion increases its hydrophobicity, thus it might turn into transmembrane helix and replace the fourth helix. Endogenous ligand binding to the metal site might disturb the charge balance and triggers helix motion, which …
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Examining the Proton Channels in Heme -Copper Oxidases
… center without a proton to maintain the charge balance. If electrons cannot enter the binuclear center then the rate of reduction of the binuclear center is impaired. The E II-101 mutant enzymes had apparent first order rate constants, for the reduction of the binuclear center, between …
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Organic p-i-n Homojunctions: Fundamentals and Applications
… process is influenced by the distinct charge transport properties of electrons and holes. The very high built-in voltage of 2.2 V in the TER004 homojunction allows a red phosphorescent homo-OLED, which shows visible emission around 650 nm with low operation voltage. We examine the …
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Space Vector Modulation and Control of Multilevel Converters
… in this dissertation is paid to the problem of charge balance in the split dc-link capacitors of three-level neutral-point-clamped converters. It is a known fact that although the charge balance in the neutral point can be maintained on a line cycle level, a significant third harmonic current …
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Understanding the challenges in HEV 5-cycle fuel economy calculations based on dynamometer test data
… because although they are required to have charge-balanced batteries over the course of a full drive cycle, they may have net charge or discharge within the individual phases. The fundamentals of studying battery charge-balance are discussed in this paper, followed by a detailed …
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Computational structure analysis of multicomponent oxides
… space and methods to deal with multicomponent charge balance constrained open systems while including both weak, long-range electrostatic interactions and strong, short-range interactions in a single cluster expansion.
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Optimal Control of Weakly Forced Nonlinear Oscillators
… a bound on the control amplitude and the charge-balance constraint. The latter is important in neural stimulations used to avoid from the undesirable effects caused by accumulation of electric charge due to external stimuli. Furthermore, we extend the results in controlling a single neuron …
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Identification and optimization of mixed light emitting layers in phosphorescent multilayer OLEDs
… of the recombination zone and a better charge balance inside the light emitting layer. Existing techniques for the detection of intermixing are very expensive and time consuming. In the second part of this thesis, it was tested whether impedance spectroscopy can be used as a suitable and …
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High-pressure states of bismuth
… on phenomenological band parameters and a simple charge-balance argument, and demonstrate that this approach can quite well describe most - but not all - of the observed behaviour of the resistivity. At higher pressures, bismuth undergoes a transition into a quasiperiodic host-guest structure. …
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Influence of Carbon Dioxide on Electrophysiology and Ionic Permeability of the Basolateral Membrane of Frog Skin (Epithelia, Ionic Flux, Cellular Ph)
… of flux, ionic equilibrium potentials, mass and charge balance restrictions indicated that the principle changes involve a transient decrease in electrical conductance to K('+) with a concurrent increase in electrical conductance to HCO(,3)('-) (OH('-) or H('+)) of the basolateral membranes of …
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New amides, amidinides and mixed-metal derivatives thereof in magnesium chemistry
… having oxo or peroxo core dianions for charge balance, have been established. The tetramethylpiperidide analogue, [{Me₂CCH₂CH₂CH₂(Me)₂CN}₄Li₂Mg₂(O)], has also been made. In an extension of this work, a larger twelve-membered (N₆Na₄Mg₂)²⁺ cationic ring system have been realised through …
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Polythiophene als sensitive Filme in chemischen Sensoren
… The advanced electrochemical quartz crystal microbalance was used for investigating the electrochemical polymerisation and the redox cycling behaviour of the polymer films deposited on the liquid facing electrode of the quartz. This method is based on impedance analysis of a piezoelectric quartz …
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Junction Based Gallium Nitride Power Devices
… problem. The structure is designed to achieve charge balance between the acceptor in p-GaN and the net donor in the multichannel AlGaN/GaN. This design enables a uniform electric field distribution and breakdown voltage over 10 kV. The fourth part of this dissertation presents the application …
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Crystal chemistry of the humite minerals
… atomic proportions and assuming electro- static charge balance in the M₁₋ₓTiₓ(OH,F)₂₋₂ₓ0₂ₓ part of the formulae. Epitaxial intergrowths between members of the humite group have been predicted on the basis of their similar structures and wet chemical analyses. Most chemical analyses of humite …
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Investigation of Electrostatic Assembly of Gold Nanoparticles Mediated by Giant Polyoxomolybdate Clusters
… through the interaction of oppositely charged nanoparticles to form larger superstructures and even crystalline superlattices. Metal nanoparticles, such as gold, have been used to design such structures, but understanding the mechanics of the self-assembly can be elusive due to their …
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Light-triggered release of bioactive compounds from HA/PLL multilayer films for stimulation of cells
… shown to have high reservoir capacity for small charged molecules (reaching mM levels in the film). Furthermore, they were able to release the stored molecules in a sustained manner. The loading and release are explained by a mechanism based on interactions between charges of the stored molecules …
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