529 research outputs found
Clasificadores de iones por movilidad eléctrica de alta resolución
No full textEn el transcurso de esta Tesis Doctoral se ha desarrollado instrumentación con alta resolución para la caracterización de iones del orden de 1-2 nm
de diámetro. En particular, se ha contribuido al desarrollo de tres analizadores
por movilidad eléctrica (DMAs, acrónimo de Differential Mobility
Analyzer) y un cargador de especies volátiles basado en electrospray (ES).
Se han evaluado numérica y experimentalmente el comportamiento fluidodinámico y la resolución de tres nuevos prototipos de DMA. Caben
destacar los siguientes resultados: (a) se ha operado un DMA en régimen
laminar a números de Reynolds hasta 62,000; (b) se ha conseguido clasificar
iones con alta resolución y sin pérdidas electroforéticas; (c) se ha
logrado operar un DMA en condiciones de flujo transónico; de este modo,
(d) se obtuvo una resolución récord de 106 con iones de 1.44 nm, y (e)
se identificaron nuevas estrategias para mejorar la resolución de futuros
DMAs en condiciones de flujo subsónico. Además, (f) se han validado
modelos numéricos para la simulación de flujos dispersos gas-partícula,
y (g) se ha verificado la bondad de técnicas estado del arte de mecánica
de fluidos computacional para su aplicación al diseñoo de instrumentación
para la caracterización de aerosoles.
Por último, se ha explorado la viabilidad del proceso de carga de especies
volátiles por medio de ES, para su posterior caracterización aguas abajo
mediante un DMA y un espectrómetro de masas (MS). Fruto de este estudio,
se han obtenido las primeras medidas de compuestos de alto peso
molecular (hasta 550 uma) presentes en el aliento humano
Developing control in piano technique, DMA recitals
No full textDMA Chamber Recital - J. Brahms and B. Bartók
DMA Recital - W. A. Mozart, H. Villa-Lobos and S. Rachmaninoff
DMA Recital - L. v. Beethoven, B. Bartók and F. Liszt
DMA Lecture Recital - Practicing Piano Etudes: Strategies to improve control over the body and the pian
Degradation of N-nitrosodimethylamine (NDMA) and its precursor dimethylamine (DMA) in mineral micropores induced by microwave irradiation
No full textRemoval of N-nitrosodimethylamine (NDMA) in drinking water treatment poses a significant technical challenge due to its small molecular size, high polarity and water solubility, and poor biodegradability. Degradation of NDMA and its precursor, dimethylamine (DMA), was investigated by adsorbing them from aqueous solution using porous mineral sorbents, followed by destruction under microwave irradiation. Among the mineral sorbents evaluated, dealuminated ZSM-5 exhibited the highest sorption capacities for NDMA and DMA, which decreased with the density of surface cations present in the micropores. In contrast, the degradation rate of the sorbed NDMA increased with the density of surface cations under microwave irradiation. Evolutions of the degradation products and C/N ratio indicate that the sorbed NDMA and DMA could be eventually mineralized under continuous microwave irradiation. The degradation rate was strongly correlated with the bulk temperature of ZSM-5 and microwave power, which is consistent with the mechanism of pyrolysis caused by formation of micro-scale "hot spots" within the mineral micropores under microwave irradiation. Compared to existing treatment options for NDMA removal, microporous mineral sorption coupled with microwave-induced degradation has the unique advantages of being able to simultaneously remove NDMA and DMA and cause their full mineralization, and thus could serve as a promising alternative method. (C) 2016 Elsevier Ltd. All rights reserved.Natural Science Foundation of China [41472324, 41322024]; National Program for Support of Top-notch Young ProfessionalsSCI(E)[email protected]
Specification and Implementation of a DMA Controller in an Embedded System
No full textThe fast growing of In-Car entertainment application leads to an increasing challenge for both data computation and data communication, which are managed by the microprocessor. The thesis project is the third stage of a continuous Direct Memory Access(DMA) Controller project in NXP Semiconductors for the purpose of specifying and implementing a DMA Controller to take over data communication tasks from the microprocessor. In the first step of the thesis, a test principle was investigated to fully test the existing results, but the simulation results of the Core Unit did not satisfy the requirements. The Core Unit of the DMA Controller is responsible for the sequential-single transfer and burst transfer involving wait states. The existing specification and implementation were analyzed, and a number of possible approaches for improvements were identified. During the second step, the Core Unit was re-specified according to these approaches, and fully implemented using VHDL to fulfill the requirements. After the Core Unit design, the functions of Linked List transfer was specified with Hatley and Pirbhai methodology. The Linked List Unit, which manages the Linked List transfer, was specified to support both the Static and Dynamic Linked List transfer. This specification provides an essential base for the future implementation. The implementation of the Core Unit was tested with Simvision following the proposed test principle. The results satisfied the function requirements. Thus, the specification was proved to be feasible. Additionally, the Core Unit was synthesized using Cadence Ambit. The number of the equivalent gates of a Core Unit Cell is 3k, which is smaller than the currently used DMA Controller in NXP Semiconductors.Microelectronics & Computer EngineeringElectrical Engineering, Mathematics and Computer Scienc
An exploration into the uses of extended techniques in works for the saxophone, and how their application may be informed by a contextual understanding of the works themselves
No full textThis thesis investigates how the specific manipulation of a range of extended techniques for the saxophone can help the performer to highlight key aspects of the music. These techniques can be performed with varying levels of nuance through which the implicit thematic relationships within a composition can be emphasised. The performer's interpretation is therefore aided by the controlled manipulation of extended techniques, with the intention of using these techniques to serve the overall analysis of the composition.
A brief summary of the acoustical phenomena which produces the saxophone's range of extended techniques is included, leading to discussion of the necessary physical manipulations of the oral cavity, alterations of fingerings systems, and other such physiological issues.
The differences from performer to performer of the resulting sounds of the saxophone's extended techniques are considered through reference to recorded material. A discussion is presented regarding individual performers' attitudes to these techniques including the preparation of extended techniques, the importance of equipment, and the performer's opinion of the composer's utilisation of extended techniques within a composition.
The final section outlines the preparation of seven compositions which use extended techniques: four of which are taken from the saxophone's standard repertoire and three of which were written in collaboration with the author. It is not the author's intention to present a global methodology by which extended techniques can be sounded in performance; rather it is the author's intention to highlight how the manipulation of these techniques, through an understanding of the acoustical and physiological nature of their production, can be performed with a nuanced production technique that can enhance the interpretation of the work as a whole
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