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 88 for “"Bistability"”.
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Bistability, Synthetic Biology, and Antibiotic Treatment
… cellular dynamics. </p><p>Here, I study emergent bistability due to bacterial interactions with either synthetic gene circuits or antibiotics. A synthetic gene circuit is often engineered by considering the host cell as an invariable "chassis". Circuit activation, however, may modulate host …
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Characterization of Bistability Behavior in Unsymmetric CFRP Laminates
… at room temperature, a phenomenon known as bistability. Unsymmetric bistable composite laminates have often been suggested for applications in aerospace morphing structures, damping, and energy storage, because of their ability to easily change their shape while being homogenized with the …
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Phenotypic variation and bistability within flagellar gene network in Salmonella Typhimurium
… motility pheotype. However, the extent of bistability is unclear. This study aims to characterize the extent of bistability within the flagellar network in Salmonella enterica serovar Typhimurium. Our results suggest that two disntinct phenotypes, motile and sessile, coexist in an isogenic …
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Bistability and Electrical Characterisation of Two Terminal Non-Volatile Polymer Memory Devices.
… a novel contribution by testing the electrical bistability of new materials; specifically, nickel oxide, barium titanate and methylammonium lead bromide and considers their properties which include nanoparticles, ferroelectric, perovskite structures and organic-inorganic composition. Due to …
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Native oxides on aluminum-bearing III-V semiconductors with applications to single-mode behavior, bistability and switching
In this work, water vapor oxidation of Al-bearing III--V semiconductors is employed to form high quality native oxides. The native oxides described are formed at temperatures in the range of 400$\sp\circ$C to 450$\sp\circ$C. Some of the basic properties of the oxide are first described. The …
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At the Intersection of Bistability and Elastic Instability: Switching and Locking Structures using Asymmetric Carbon Fiber Composites
… Reinforced Polymer (CFRP) laminates, have shown bistability, i.e., they have two stable equilibria or states that arise due to thermal imbalances during the curing process. This forces the laminate to exhibit two mutually perpendicular characteristic curvatures in two different stable states. The …
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OPTICAL BISTABILITY IN ZINC-SULFIDE AND ZINC-SELENIDE THIN-FILM INTERFERENCE FILTERS AND IN GALLIUM-ARSENIDE AND COPPER-CHLORIDE ETALONS (NONLINEAR).
Two-photon optical bistability in commercial thin-film interference filters with ZnS and ZnSe spacers is observed with switching times ≳ 200 μs. The accompanying drifting of the bistability loop in time and laser-induced "damage" indicate a thermal mechanism. The problem of water vapor absorption …
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DESIGN AND PERFORMANCE ANALYSIS OF AN OPTICAL PROTERETIC DELTA-SIGMA MODULATOR
… sigma modulator (BDSM) [27] by changing its bistability to proteretic bistability in order to increase the modulator bandwidth frequency. An innovative delta sigma modulator called proteretic binary delta sigma modulator (PBDSM), which is optically compatible, is investigated theoretically …
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Nonequilibrium transitions in quantum optical systems
… driving field and nonlinear dispersion, optical bistability can occur. In chapter four a model of sub/second harmonic generation is introduced. This has several non-equilibrium transitions, including dispersive optical bistability, and bistable behaviour with coherent phase-locked input to both …
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Mathematical Modeling and Computational Studies for Cell Signaling
… The mating decision in yeast is a switch-like or bistability response that allows cells to filter out weak pheromone signals or avoiding improper mating when a mate is sufficiently close. In many cases, scaffold proteins are thought to play a key role during this process. The molecular mechanisms …
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A NOVEL DESIGN OF AN ALL-OPTICAL BISTABLE DEVICE USING A SINGLE ACTIVE ELEMENT
… developed. Then a full characterization of the bistability with regard to the individual inverting amplier parameters is given. From this characterization, device's valid regions of operation is then investigated and tested with a more realistic optical simulation. Finally in ch. 4, a novel …
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Mathematical modeling of pathways involved in cell cycle regulation and differentiation
… in colon cancers. Based on some evidence of bistability in the Wnt signaling pathway, we proposed the existence of a positive feedback loop underlying the activation and inactivation of the core protein complex of the pathway. Bistability is a common feature of biological systems that toggle …
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Algorithms for Reconstructing and Reasoning about Chemical Reaction Networks
… behaviors of CRNs. Specifically, we focus on bistability---an important dynamical property of a CRN---and propose algorithms to identify the core structures responsible for conferring bistability. The approach we take is to systematically infer the instability causing structures (ICSs) of a …
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Study of the compliance and system integration of bistable structures for use as actuation mechanisms in bioinspired adaptive systems
… the truss mechanism is compressed increases the bistability of the mechanism and decreases the force required to actuate the mechanism. In addition, adjusting the compliance of the boundary conditions of the bistable element allows for even finer tuning of the mechanism actuation force and …
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An electrothermally-actuated bistable MEMS relay for power applications
… not rely on internal stress or hinges for its bistability, which is then combined with transient electrothermal actuation and contact structure to develop a MEMS relay for power switching. The relay components, fabricated by a through etch of a silicon wafer using deep reactive ion etch (DRIE), …
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Friction effects on collective mechanisms of short term memory
… Finally, we demonstrate that dendritic bistability can improve robustness in a biophysically realistic network of conductance based neurons.
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Hysteretic properties of a modular positive feedback-based gene amplifier
… and can be used to achieve amplification, bistability, and hysteresis. Positive feedback mechanisms have been employed in numerous synthetic biology applications, including in the development of a modular positive feedback-based gene amplifier by Nistala et al. [1]. The modular design …
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Mathematical models for polymer-nematic interactions
… lead to non-trivial results, including loss of bistability under gliding. Perhaps surprisingly, it is observed that externally imposed switching between the steady states of a bistable system may reverse the effect of gliding, preventing loss of bistability if switching is sufficiently frequent. …
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