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Dynamics of Ferrofluidic Flow in the Taylor-Couette System With a Small Aspect Ratio

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We investigate fundamental nonlinear dynamics of ferrofluidic Taylor-Couette flow - flow confined be-tween two concentric independently rotating cylinders - consider small aspect ratio by solving the ferro-hydrodynamical equations, carrying out systematic bifurcation analysis. Without magnetic field, we find steady flow

We investigate fundamental nonlinear dynamics of ferrofluidic Taylor-Couette flow - flow confined be-tween two concentric independently rotating cylinders - consider small aspect ratio by solving the ferro-hydrodynamical equations, carrying out systematic bifurcation analysis. Without magnetic field, we find steady flow patterns, previously observed with a simple fluid, such as those containing normal one- or two vortex cells, as well as anomalous one-cell and twin-cell flow states. However, when a symmetry-breaking transverse magnetic field is present, all flow states exhibit stimulated, finite two-fold mode. Various bifurcations between steady and unsteady states can occur, corresponding to the transitions between the two-cell and one-cell states. While unsteady, axially oscillating flow states can arise, we also detect the emergence of new unsteady flow states. In particular, we uncover two new states: one contains only the azimuthally oscillating solution in the configuration of the twin-cell flow state, and an-other a rotating flow state. Topologically, these flow states are a limit cycle and a quasiperiodic solution on a two-torus, respectively. Emergence of new flow states in addition to observed ones with classical fluid, indicates that richer but potentially more controllable dynamics in ferrofluidic flows, as such flow states depend on the external magnetic field.

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2017-01-06

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Music Teacher Education in Turkey and in the USA: Musical Aptitude and Attitude toward Teaching [Turkish Abstract]

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An investigation of musical aptitude and attitudes toward teaching among pre-service music teachers in Turkey (n = 42) and the United States (n = 35). Multivariate analysis revealed statistically significant differences by nationality in favor of the Turkish subjects on

An investigation of musical aptitude and attitudes toward teaching among pre-service music teachers in Turkey (n = 42) and the United States (n = 35). Multivariate analysis revealed statistically significant differences by nationality in favor of the Turkish subjects on the tonal, rhythm, and total tests on the Advanced Measures of Music Audiation (AMMA) by Edwin Gordon. There were no significant differences by sex or for the interaction of nationality and sex. There were negative correlations between AMMA scores and scores on the Minnesota Teacher Attitude Inventory, which means that subjects with high music aptitude scores tended to hold attitudes that do not predict effective teaching behaviors. There were also significant differences by nationality on a questionnaire about attitudes toward various music instructional activities in schools.

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Date Created
2007

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Madiba 46664

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Nelson Rolihlahla Mandela was born July 18, 1918 into the Madiba clan in Mvezo, Transkei, South Africa. Mandela was a lawyer by trade and a freedom fighter who envisioned freedom and equality for all South Africans regardless of race. In

Nelson Rolihlahla Mandela was born July 18, 1918 into the Madiba clan in Mvezo, Transkei, South Africa. Mandela was a lawyer by trade and a freedom fighter who envisioned freedom and equality for all South Africans regardless of race. In 1965, Mandela was imprisoned at Robben Island for twenty-seven years for treason and terrorist activities against the South African apartheid regime: he was assigned prison numbers 46664. In 1992, Mandela was released from prison and two years later not only became the first democratically elected president of South Africa, but also its first black president. "Madiba 46664" is an eight-minute chamber work scored for flute, oboe, clarinet in B-flat, and bassoon; vibraphone, and two percussionists; piano; violins, violas, and celli. The work blends traditional South African rhythms of the drumming culture with elements of Western harmony and form in contrasting textures of homophony, polyphony and antiphony. "Madiba 46664" utilizes Mandela's prison number, birthdate and age (at the time the composition process began in 2013) for the initial generation of meter, rhythm, harmony, melody, and form. The work also shares intercultural concepts that can be seen in the works of three contemporary African composers, South Africans Jeanne Zaidel-Rudolph and Andile Khumalo, and Nigerian Ayo Oluranti. Each section represents a period of Mandela's life as a freedom fighter, a prisoner, and a president. The inspiration stems from the composer's discussions with Mandela soon after his release from prison and prior to his presidency. These lively discussions pertained to the state of traditional music in then apartheid South Africa and led to this creation. The conversations also played a role in the creative process.

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2014

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A New home: a composition for chamber orchestra

Description

A New Home is a multi-movement musical composition written for a chamber orchestra of flute, oboe, clarinet in B-flat, bassoon, horn in F, trumpet in C, trombone, bass trombone, percussion (1), pianoforte, and strings. The duration of the entire

A New Home is a multi-movement musical composition written for a chamber orchestra of flute, oboe, clarinet in B-flat, bassoon, horn in F, trumpet in C, trombone, bass trombone, percussion (1), pianoforte, and strings. The duration of the entire piece is approximately fourteen minutes (movement 1: four minutes; mvt. 2: four minutes and thirty seconds; mvt. 3: five minutes and thirty seconds). As an exercise in compositional experimentation, some of the musical techniques explored throughout the piece are harmonic planing or parallelism, ostinati, modality, chromatic dissonance, thematic transformation, mixed meter, and syncopation, as well as issues of orchestral blend, balance, and color.

The first movement, ironically titled “Don’t Panic,” highlights my initial anxieties on experimentation by creating hectic textures. The movement is structured around two main alternating sections of chromatic, chordal dissonance with more modal, melodic syncopation in addition to a developmental section, but a sense of rhythmic groove is prominent throughout. The second movement, “Still Here,” is a darker, more sensitive music as it explores various settings of its main thematic material interspersed with march-like episodes and a related secondary theme. The themes are organized around a diatonic scale that omits one pitch to comprise a six-note scale. The third movement, “Change of State,” recalls the modality and rhythmic liveliness of the first movement, and it bears a thematic relationship to the second movement. Much of the material also revolves around scales and mediant relationships to comprise an opening theme, a groove section, and an ethereal, glassy texture which ends the movement. Essentially, the piece closes with a calmer music in contrast to the brute force that opened the piece.

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Date Created
2016

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William Bolcom's 3 ghost rags: an orchestration for chamber ensemble with commentary on the history and propagation of ragtime

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The purpose of this project is twofold: to contribute to the literature of chamber ensembles comprising mixed wind, string, and percussion instruments by producing arrangements of three piano rags by William Bolcom; and to highlight Bolcom's pivotal role in the

The purpose of this project is twofold: to contribute to the literature of chamber ensembles comprising mixed wind, string, and percussion instruments by producing arrangements of three piano rags by William Bolcom; and to highlight Bolcom's pivotal role in the ragtime revival of the 1960's and 1970's. Through his influence as a scholar, composer, and performer, Bolcom (b. 1938), one of the most prominent American composers of his generation, helped garner respect for ragtime as art music and as one of America's great popular music genres. Bolcom's 3 Ghost Rags were written in the tradition of classic piano rags, but with a compositional sensibility that is influenced by the fifty years that separate them from the close of the original ragtime era. The basis for the present orchestrations of 3 Ghost Rags is the collection of instrumental arrangements of piano rags published by Stark Publishing Co., entitled Standard High-Class Rags. More familiarly known as the "Red Back Book," this publication was representative of the exchange of repertoire between piano and ensembles and served as a repertory for the various ragtime revivals that occurred later in the twentieth century. In creating these orchestrations of Bolcom's piano rags, the author strove to provide another medium in which Bolcom's music could be performed, while orchestrating the music for an historically appropriate ensemble.

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Date Created
2013

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Preservation symphony

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Preservation Symphony is a short, multi-movement, orchestral composition that explores the versatility of the [016] pitch class set as the dominant unifying force of this cyclical work. The composition is scored for Piccolo, two Flutes, two Oboes, English Horn, two

Preservation Symphony is a short, multi-movement, orchestral composition that explores the versatility of the [016] pitch class set as the dominant unifying force of this cyclical work. The composition is scored for Piccolo, two Flutes, two Oboes, English Horn, two Clarinets, Bass Clarinet, full complement of Brass, Timpani, two Percussionists, and Strings. Movement one is in sonata form; the [016] set is used in structuring its overall formal scheme. The primary focus of the movement is on the tritone [0 6] as a replacement for the traditional tonic and dominant polarity. The movement features a driving force that alternates between pulse subdivisions of even sixteenth notes and sixteenth-note triplets. Movement two is in simple binary form with a central tonality of A. An English Horn solo functions as both the opening of the movement and a transition from the tonality of movement one (F) into the new tonal center of A. The unifying pitch class set [016] is used in this movement in a Phrygian context. Movement two has a contemplative and dark tone, which is in stark contrast to the outer movements. Movement three has a lighter, upbeat nature. The movement is in rondo form with its main theme written in a folk-like character. This movement returns to F as the central tonality, completing the overall tonal plan of the work. As in movement one, it explores the tritone polarity of F and B. The movement also revisits the chromatic mediant relationship found in the middle of movement two in the oboes. The pitch class set is now used in the context of a Lydian-Mixolydian (or acoustic) scale, from which both the central and secondary themes of the rondo are derived.

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Date Created
2014

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Bright summer: for orchestra

Description

Bright Summer, a one-movement piece for orchestra, was composed in Arizona, and completed in February 2013. The piece is approximately twelve minutes long. The motivation for writing this piece was the death of my mother the year before, in 2012.

Bright Summer, a one-movement piece for orchestra, was composed in Arizona, and completed in February 2013. The piece is approximately twelve minutes long. The motivation for writing this piece was the death of my mother the year before, in 2012. The prevailing mood of this work is bright and pleasant, expressing my mother's cheerful personality when she was alive. It also portrays bright summer days which resemble my mother's spirit. Thus, soundscape plays an important role in this work. It depicts summer breeze, rustling sounds of leaves, and, to translate a Korean saying, "high blue skies." This soundscape opens the piece as well as closes it. In the middle section, the fast upbeat themes represent my mother's witty and optimistic personality. The piece also contains the presence of a hymn tune, The Love of God is Greater Far, which informs the motivic content and also functions as the climax of the piece. It was my mother's favorite hymn and we used to sing it together following her conversion to Christianity. The piece contains three main sections, which are held together by transitional material based on the soundscape and metric modulations. Unlike my earlier works, Bright Summer is tonal, with upper tertian harmonies prevailing throughout the piece. However, the opening and closing soundscapes do not have functional harmonies. For example, tertian chords appear and vanish silently, leaving behind some resonant sounds without any harmonic progression. Overall, the whole piece is reminiscent of my mother who lived a beautiful life.

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Date Created
2013

A: compact disc recording of three commissioned works featuring the clarinet by Portuguese composers, which include Portuguese folk music elements

Description

Despite the wealth of folk music traditions in Portugal and the importance of the clarinet in the music of bandas filarmonicas, it is uncommon to find works featuring the clarinet using Portuguese folk music elements. In the interest of expanding

Despite the wealth of folk music traditions in Portugal and the importance of the clarinet in the music of bandas filarmonicas, it is uncommon to find works featuring the clarinet using Portuguese folk music elements. In the interest of expanding this type of repertoire, three new works were commissioned from three different composers. The resulting works are Seres Imaginarios 3 by Luis Cardoso; Delirio Barroco by Tiago Derrica; and Memória by Pedro Faria Gomes. In an effort to submit these new works for inclusion into mainstream performance literature, the author has recorded these works on compact disc. This document includes interview transcripts with each composer, providing first-person discussion of each composition, as well as detailed biographical information on each composer. To provide context, the author has included a brief discussion on Portuguese folk music, and in particular, the role that the clarinet plays in Portuguese folk music culture.

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2013

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Piano quintet

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Piano Quintet> is a three movement piece, inspired by music of Eastern Europe. Sunrise in Hungary starts with a legato song in the first violin unfolding over slow moving sustained harmonics in the rest of the strings. This is contrasted

Piano Quintet> is a three movement piece, inspired by music of Eastern Europe. Sunrise in Hungary starts with a legato song in the first violin unfolding over slow moving sustained harmonics in the rest of the strings. This is contrasted with a lively Hungarian dance which starts in the piano and jumps throughout all of the voices. Armenian Lament introduces a mournful melody performed over a subtly shifting pedal tone in the cello. The rest of the voices are slowly introduced until the movement builds into a canonic threnody. Evening in Bulgaria borrows from the vast repertoire of Bulgarian dances, including rhythms from the horo and rachenitsa. Each time that the movement returns to the primary theme, it incorporates aspects of the dance that directly preceded it. The final return is the crux of the piece, with the first violin playing a virtuosic ornaments run on the melody.

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Date Created
2014

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The peacock flies southeast: for qudi and orchestra

Description

THE PEACOCK FLIES SOUTHEAST is a work for Qudi and orchestra inspired by an ancient Chinese love story of the same title. The Qudi is also known as the "Chinese bamboo flute." It is similar to the Western piccolo. However,

THE PEACOCK FLIES SOUTHEAST is a work for Qudi and orchestra inspired by an ancient Chinese love story of the same title. The Qudi is also known as the "Chinese bamboo flute." It is similar to the Western piccolo. However, it has open tone holes with greater ability to bend pitches. The Qudi sounds one octave above the written music with arrange from A4 to G7.

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Date Created
2014