Tensional processes and perception of form in three selected compositions by Kaija Saariaho

<p>The primary feature that gives ‘spectral music’ its stylistic uniqueness within the field of art music is the blurring of the traditionally distinct roles of harmony and timbre, through the use of chords derived from the naturally occurring overtones of instrumental timbre (often referred to as timbre chords). Development of these chords typically occurs very gradually, meaning it is often difficult to perceive the overall form of a spectral work based on the progression through its constituent timbre chords. This approach contrasts with the traditional reliance in both art music and other Western music styles on perceivable pitch-based development as a primary means of providing musical tension and form. Composers of spectral music must rely on the manipulation and development of other musical parameters to provide sufficient interest through ‘foreground ornamentation’ while its underlying harmonic/timbral macrostructure unfolds beneath. This analysis shows how key musical parameters are manipulated over time to provide tension and resolution (or, in Wallace Berry’s terminology, ‘progressive and recessive processes’ ¹ ), giving spectral works a perceivable, dynamic form. Parameters examined include rate of harmonic change, dynamics, spectral/registral spread, rhythmic activity, sound/noise, spectral density and harmonicity/inharmonicity (the latter two providing a spectral analogue to conventional notions of dissonance). Particular focus is placed on the rate of harmonic change in the selected works and changes in the harmonicity/inharmonicity (through spectral distortion) of harmonic material that give spectral music its distinctive harmonic character. The way in which these ‘parameter curves’ intersect with one another is also examined. For this study, three works by Finnish composer Kaija Saariaho are analysed. The works cover a range of forces and display varying degrees of overtly ‘spectral’ influence: Nymphéa (1987) for string quartet and electronics, Du Cristal (1990) for orchestra, and Cendres (1998) for piano, cello and flute. Analysis of the background levels of parametric change reveal how Saariaho manages to maintain microstructural interest in her spectral works while adhering to an underlying macrostructural plan. Findings from this analysis will also be discussed in relation to how they have influenced my own creative output for my MMA portfolio.</p>

Tensional processes and perception of form in three selected compositions by Kaija Saariaho

<p>The primary feature that gives ‘spectral music’ its stylistic uniqueness within the field of art music is the blurring of the traditionally distinct roles of harmony and timbre, through the use of chords derived from the naturally occurring overtones of instrumental timbre (often referred to as timbre chords). Development of these chords typically occurs very gradually, meaning it is often difficult to perceive the overall form of a spectral work based on the progression through its constituent timbre chords. This approach contrasts with the traditional reliance in both art music and other Western music styles on perceivable pitch-based development as a primary means of providing musical tension and form. Composers of spectral music must rely on the manipulation and development of other musical parameters to provide sufficient interest through ‘foreground ornamentation’ while its underlying harmonic/timbral macrostructure unfolds beneath. This analysis shows how key musical parameters are manipulated over time to provide tension and resolution (or, in Wallace Berry’s terminology, ‘progressive and recessive processes’ ¹ ), giving spectral works a perceivable, dynamic form. Parameters examined include rate of harmonic change, dynamics, spectral/registral spread, rhythmic activity, sound/noise, spectral density and harmonicity/inharmonicity (the latter two providing a spectral analogue to conventional notions of dissonance). Particular focus is placed on the rate of harmonic change in the selected works and changes in the harmonicity/inharmonicity (through spectral distortion) of harmonic material that give spectral music its distinctive harmonic character. The way in which these ‘parameter curves’ intersect with one another is also examined. For this study, three works by Finnish composer Kaija Saariaho are analysed. The works cover a range of forces and display varying degrees of overtly ‘spectral’ influence: Nymphéa (1987) for string quartet and electronics, Du Cristal (1990) for orchestra, and Cendres (1998) for piano, cello and flute. Analysis of the background levels of parametric change reveal how Saariaho manages to maintain microstructural interest in her spectral works while adhering to an underlying macrostructural plan. Findings from this analysis will also be discussed in relation to how they have influenced my own creative output for my MMA portfolio.</p>

Brazilian Portuguese

The aim of this article is twofold. In the first place, we present evidence that the syntactic change towards overt pronominal subjects observed in Brazilian Portuguese is not a stable phenomenon; rather, our empirical results allow to follow the parametric change in course and to identify the progressive loss of crucial properties related to ‘consistent’ null subject languages. The contrastive analysis with European Portuguese shows the stronger and the weaker structural contexts in this continuous battle towards the implementation of overt pronouns. Personal sentences (with definite and ‘indefinite’ – arbitrary and generic – subjects, usually referred as “impersonal”) are analyzed in more detail than those we consider impersonal sentences, which include a variety of structures, with climate, existential and unaccusative verbs, . They are, however, shown to have been deeply affected by the re-setting of the value of the Null Subject Parameter. Then, we will briefly compare Brazilian Portuguese with Finnish null subjects to conclude that Brazilian Portuguese does not seem to fit the group of the so called ‘partial’ null subject languages, which seem to exhibit null subjects in very restricted contexts, have a lexical expletive in apparent variation with null and generic subjects as well as in impersonal sentences, when it seems to be merged to avoid a verb-initial sentence.

The Role of Mobility and Sanitary Measures on the Delay of Community Transmission of COVID-19 in Costa Rica

The aim of this paper is to infer the effects that change on human mobility had on the transmission dynamics during the first four months of the SARS-CoV-2 pandemic in Costa Rica, which could have played a role in delaying community transmission in the country. First, by using parametric and non-parametric change-point detection techniques, we were able to identify two different periods when the trend of daily new cases significantly changed. Second, we explored the association of these changes with data on population mobility. This also allowed us to estimate the lag between changes in human mobility and rates of daily new cases. The information was then used to establish an association between changes in population mobility and the sanitary measures adopted during the study period. Results showed that during the initial two months of the pandemic in Costa Rica, the implementation of sanitary measures and their impact on reducing human mobility translated to a mean reduction of 54% in the number of daily cases from the projected number, delaying community transmission.

Robustness of Neural Network Emulations of Radiative Transfer Parameterizations in a State-of-the-Art General Circulation Model

The ability of Machine-Learning (ML) based model components to generalize to the previously unseen inputs, and the resulting stability of the models that use these components, has been receiving a lot of recent attention, especially when it comes to ML-based parameterizations. At the same time, ML-based emulators of existing parameterizations can be stable, accurate, and fast when used in the model they were specifically designed for. In this work we show that shallow-neural-network-based emulators of radiative transfer parameterizations developed almost a decade ago for a state-of-the-art GCM are robust with respect to the substantial structural and parametric change in the host model: when used in two seven month-long experiments with the new model, they not only remain stable, but generate realistic output. Aspects of neural network architecture and training set design potentially contributing to stability of ML-based model components are discussed.

PENSION REFORM IN AN AUTHORITARIAN STATE: A CASE STUDY OF EGYPT

This article focuses on two pension reforms in Egypt in order to understand the dynamics of social policy reform under authoritarian rule. One was supported by the World Bank and promulgated in 2010. It included drastic changes, such as the introduction of a defined benefit scheme, and ultimately failed. Another was successfully implemented in 2019. Compared to the 2010 reform, the 2019 reform involved only parametric change (such as increasing the retirement age and amalgamating social insurance funds), in order to mitigate the criticisms that had been made of the previous pension reform and to facilitate gradual, steady enhancement of the programme’s sustainability. The findings suggest that perceptions of authoritarian leaders as having wide-ranging discretion in decision-making concerning public policy and being able to more decisively implement harsh social reform compared with democratic political leaders need to be reconsidered.

Simple adaptive control to attenuate bridge’s seismic responses considering parametric variations

Parametric variations occur throughout a bridge’s service life as a result of temperature variations, cracking, localized damage, and fatigue. Existing bridge’s parameters are difficult to estimate precisely and implemented control schemes may perform unsatisfactorily depending on how sensitive they are to parametric change. In this study, an adaptive control approach is developed utilizing the simple adaptive control algorithm and designed aiming to mitigate seismic responses of bridges considering realistic implementation. Adaptive control is a viable alternative to control bridge structures as it is able to calculate control gains that vary over time based on sensed responses, sustaining performance in face of parametric variations. The proposed approach allows the choice of a model reference of significantly low order and it does not require full-state feedback or the use of observers. The effectiveness and robustness of the control approach are investigated when controlling a seismically excited two-span highway bridge considering systematic parametric variations. Evaluation of relevant performance criteria indicates that the adaptive scheme is effective in reducing seismic responses and sustains well the overall performance when systematic parametric variations are introduced. The proposed approach requires a small and reasonable number of sensors to present effectiveness and performs satisfactorily even when in the presence of measurement noise.