Exact Mode Shapes of T-shaped and Overhang-shaped Microcantilevers

Resonance frequencies and mode shapes of microcantilevers are of important interest in micro-mechanical systems for enhancing the functionality and applicable range of the cantilevers in vibration transducing, energy harvesting, and highly sensitive measurement. In this study, using the Euler-Bernoulli theory for beam, we figured out the exact mode shapes of cantilevers of varying widths such as the overhang- or T-shaped cantilevers. The obtained mode shapes have been shown to significantly deviate from the approximate forms of a rectangular cantilever that are commonly used in mechanics and physics. They were then used to figure out the resonance frequencies of the cantilever. The analytical solutions have been confirmed by using the finite element method simulations with very low deviation. This study suggested a method for correctly obtaining the resonance frequency of microcantilevers with complicated dimensions, such as the doubly clamped cantilever with the undercut, with the overhangs at the clamped positions, or with an attached mass in the middle

Impact of diagenesis on the spatial and temporal distribution of reservoir quality in the Jurassic Arab D and C members, offshore Abu Dhabi oilfield, United Arab Emirates

This study is based on petrographic examination (optical, scanning electron microscope, cathodo-luminescence, backscattered electron imaging, and fluorescence) of 1, 350 thin sections as well as isotopic compositions of carbonates (172 carbon and oxygen and 118 strontium isotopes), microprobe analyses, and fluid inclusion microthermometry of cored Jurassic Arab D and C members from 16 wells in a field from offshore Abu Dhabi, United Arab Emirates. The formation was deposited in a ramp with barrier islands and distal slope setting. Petrographic, stable isotopic and fluid-inclusion analyses have unraveled the impact of diagenesis on reservoir quality of Arab D and C within the framework of depositional facies, sequence stratigraphy, and burial history. Diagenetic processes include cementation by grain rim cement and syntaxial calcite overgrowths, formation of moldic porosity by dissolution of allochems, dolomitization and dolomite cementation, cementation by gypsum and anhydrite, and stylolitization. Partial eogenetic calcite and dolomite cementation has prevented porosity loss in grainstones during burial diagenesis. Dolomitization and sulphate cementation of peritidal mud are suggested to have occurred in an evaporative sabkha setting, whereas dolomitization of subtidal packstones and grainstones was driven by seepage reflux of lagoon brines formed during major falls in relative sea level. Recrystallization of dolomite occurred by hot saline waters (Th 85-100\ub0C; and salinity 14-18 wt% NaCl). Anhydrite and gypsum cements (Th 95-105\ub0C; fluid salinity 16-20 wt% NaCl), were subjected to extensive dissolution, presumably caused by thermal sulfate reduction followed by a major phase of oil emplacement. The last cement recorded was a second phase of anhydrite and gypsum (Th 95-120\ub0C; 16-22 wt% NaCl), which fills fractures associated with faults

A RMSM-X model for Turkey

To improve the Bank's macroeconomic modeling capabilities, a continuum of macro models referred to as RMSM-X and RMSM-XX are being developed. These models share a common accounting framework that ensures economic consistency among economic sectors. This paper shows how to specify the budget constraints and market clearing conditions in a RMSM-X model for Turkey. An overview of the system defined by the RMSM-X model, the debt module (DM) and the data base is presented, along with a detailed explanation of the theoretical model. Alternative closure rules are discussed and the debt model is presented. This paper also includes annexes which present a complete set of historical data and an explanation of how the data was constructed.Economic Theory&Research,Environmental Economics&Policies,Banks&Banking Reform,Economic Stabilization,Financial Intermediation

The effects of disorder in strongly interacting quantum systems

This thesis contains four studies of the effects of disorder and randomness on strongly correlated quantum phases of matter. Starting with an itinerant ferromagnet, I first use an order-by-disorder approach to show that adding quenched charged disorder to the model generates new quantum fluctuations in the vicinity of the quantum critical point which lead to the formation of a novel magnetic phase known as a helical glass. Switching to bosons, I then employ a momentum-shell renormalisation group analysis of disordered lattice gases of bosons where I show that disorder breaks ergodicity in a non-trivial way, leading to unexpected glassy freezing effects. This work was carried out in the context of ultracold atomic gases, however the same physics can be realised in dimerised quantum antiferromagnets. By mapping the antiferromagnetic model onto a hard-core lattice gas of bosons, I go on to show the importance of the non-ergodic effects to the thermodynamics of the model and find evidence for an unusual glassy phase known as a Mott glass not previously thought to exist in this model. Finally, I use a mean-field numerical approach to simulate current generation quantum gas microscopes and demonstrate the feasibility of a novel measurement scheme designed to measure the Edwards-Anderson order parameter, a quantity which describes the degree of ergodicity breaking and which has never before been experimentally measured in any strongly correlated quantum system. Together, these works show that the addition of disorder into strongly interacting quantum systems can lead to qualitatively new behaviour, triggering the formation of new phases and new physics, rather than simply leading to small quantitative changes to the physics of the clean system. They provide new insights into the underlying physics of the models and make direct connection with experimental systems which can be used to test the results presented here

Elektromagnetische transiente Ausgleichsvorgänge in HGÜ-Systemen und deren Auswirkung auf die Isolationskoordination von Kabelanlagen

Die Hochspannungs-Gleichstrom-Übertragung (HGÜ) auf Basis selbstgeführter Umrichter stellt einen Eckpfeiler für den Erfolg der Energiewende dar. Ausgelöst durch die prognostizierten Netzausbaumaßnahmen werden HGÜ-Kabelsysteme mittelfristig eine tragende Rolle in den europäischen Stromübertragungsnetzen einnehmen. Um für solche HGÜ-Kabelanlagen eine zuverlässige Auslegungsstrategie ermöglichen zu können, ist eine umfassende Kenntnis über die potentiell zu erwartenden elektrischen Beanspruchungen von entscheidender Bedeutung. Der Fokus dieser Forschungsarbeit liegt auf der Identifikation der mannigfaltigen Spannungsbeanspruchungen, die in HGÜ-Systemen basierend auf der Umrichtertechnologie von modularen Multilevelumrichtern während der Lebensdauer auftreten können. Hierzu zählen sowohl äußere Überspannungen infolge atmosphärischer Einwirkungen als auch innere Überspannungen aufgrund von diversen internen Fehlerereignissen. Diese Dissertation liefert eine umfassende Analyse der auftretenden elektromagnetischen transienten Ausgleichsvorgänge und leistet einen Beitrag zur Isolationskoordination von HGÜ-Kabelanlagen

Republican Journal: Vol. 58, No. 30 - July 29,1886

https://digitalmaine.com/rj_1886/1029/thumbnail.jp

Impact of learning city networks on multi-level urban development and transformation processes

Learning city networks are real-time laboratories related to national and local urban development policies. In order to support learning city networks, the Federal Institute for Research on Building, Urban Affairs and Spatial Development (BBSR) together with the Federal Ministry of Housing, Urban Development and Building (BMWSB), the U.S. Department of Housing and Urban Development (HUD), the German Marshall Fund of the United States (GMF), the Deutsche Gesellschaft für internationale Zusammenarbeit (GIZ), and partner cities have developed and further enhanced the multi-level D4UC (Dialogues for Urban Change) Method since 2012. This method makes an international exchange on the specificities of urban transformation processes, based on purposeful projects, possible for participating cities. The article discusses methods and lessons learned and is framed within a theoretical background of learning networks