Browsing by Subject "Instability"
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Item Open Access Disc brake squeal characterization through simplified test rigs(Elsevier, 2009-11) Akay, A.; Giannini, O.; Massi, F.; Sestieri, A.This paper presents a review of recent investigations on brake squeal noise carried out on simplified experimental rigs. The common theme of these works is that of approaching the study of squeal noise on experimental set-ups that are much simpler than commercial disc brakes, providing the possibility of repeatable measurements of squeal occurrence. As a consequence, it is possible to build consistent and robust models of the experimental apparatus to simulate the squeal events and to understand the physics behind squeal instabilities. © 2009.Item Open Access The Ferghana Valley as a factor of instability(Bilkent University, 2000) Sydykov, AslanAfter the collapse of the Soviet Union the huge territory of Central Asia turned to be one of the most conflict-ridden 1nd unstable areas in thr world. Several bloody uprisings have occurred and are occurring in the region, including some in the Ferghana Valley. This valley plays a crucial role in the economic, social and political life of three of five of the central Asian states: Kyrgyzstan, Tajikistan, Uzbekistan. The pre-Soviet and Soviet legacy and the problems raised since the independence of these states makes me to determine several factors that directly influence on stability in the region. This thesis tries to show how these factors destabilise situation in the Ferghana Valley and the Central Asian region as a whole.Item Open Access Tailoring self-organized nanostructured morphologies in kilometer-long polymer fiber(Nature Publishing Group, 2014-05-06) Khudiyev, T.; Tobail, O.; Bayındır, MehmetWhile nanowires and nanospheres have been utilized in the design of a diverse array of nanoscale devices, recent schemes frequently require nanoscale architectures of higher complexity. However, conventional techniques are largely unsatisfactory for the production of more intricate nanoscale shapes and patterns, and even successful fabrication methods are incompatible with large-scale production efforts. Novel top-down, iterative size reduction (ISR)-mediated approaches have recently been shown to be promising for the production of high-throughput cylindrical and spherical nanostructures, though more complex architectures have yet to be created using this process. Here we report the presence of a hitherto-undescribed transitory region between nanowire and nanosphere transformation, where a diverse array of complex quasi one-dimensional nanostructures is produced by Rayleigh-Plateau instability-mediated deformation during the progress of a combined ISR/thermal instability technique. Temperature-based tailoring of architecturally diverse, indefinitely long, globally parallel, complex nanostructure arrays with high uniformity and low size variation facilitates the development of in-fiber or free-standing nanodevices with significant advantages over on-chip devices.