Chipendani (mouth bow): The origin of the Shona Mbira harmonic system and of Andrew Tracey’s ‘basic Kalimba core’ with an appendix on the Venda Tshihwana

Author(s):  
Klaus-Peter Brenner
Keyword(s):  
2015 ◽  
Vol 15 (1) ◽  
Author(s):  
Zhao Liu ◽  
Wei Dai

AbstractIn this paper, we consider the following poly-harmonic system with Dirichlet boundary conditions in a half space ℝwherewhereis the Green’s function in ℝ


2010 ◽  
Vol 20 (3) ◽  
pp. 314-319 ◽  
Author(s):  
Tomáš Tomáš ◽  
Pavel JaníčEk ◽  
Luboš Nachtnebl ◽  
ŠTěPáN OndrůšEk ◽  
Radek Kunovský

Author(s):  
David Kopp

This article examines the role of key and function as a component of Riemann's relational harmonic system. It is argued in this article that while the neo-Riemannian abstraction of Riemann's Harmonieschritte offer certain insights into the nature of chromatic relations in the nineteenth-century music, it has also resulted in a view of harmonic relations uncomfortably divorced and separated from the tonal and functional contexts in which they were conceived. In addition to examining the role of key and function as component of Riemann's relational harmonic system, and chromaticism, the article also suggests how neo-Riemannian analysis can benefit by reconnecting Riemannian harmonic relations to the functional tonal contexts in which they arose, illustrating the recovered and renewed nineteenth-century perspective with analyses of music by Beethoven, Schubert, and Wolf.


2010 ◽  
Vol 132 (1) ◽  
Author(s):  
Rajaey Kased ◽  
Tarunraj Singh

A linear programming approach designed to eliminate the residual vibration of the two-mass harmonic system subject to friction and undergoing a point-to-point maneuver is proposed and implemented on an experimental test bed. Techniques for design of positive pulse control profiles for nonrobust and robust open loop controller design are explored, where the positive pulses initiate motion and the friction force brings the system to rest. It is shown that consistent results can be obtained from experiments and the robustness against frequency uncertainty results in the reduction in residual vibration as well as steady-state error.


Leonardo ◽  
2003 ◽  
Vol 36 (1) ◽  
pp. 13-17 ◽  
Author(s):  
Christopher Hight

Discussions of race and identity have often privileged the visual field and its representations as a site of cultural identity. In contrast, this paper examines how sound and its organization have been implicated in the constructions of “whiteness” as a normative category during the colonial epoch. Using a set of case studies, it examines the network formed between sound and vision through what the author calls a harmonic system of representation. After mapping this dominant system, the paper describes tactics that have been used to disrupt it. The possibility of heterogeneous subjectivity, often called the cyborg, is explored as an alternative, in relation to different organizations of sound.


2020 ◽  
Author(s):  
◽  
Ernesto Esteban Ledesma

En los últimos años la agricultura de precisión a tomado mucha relevancia en la búsqueda de optimizar recursos y obtener mejores resultados, dia a dia se trabaja sobre nuevas tecnologías que permitan llegar al productor para obtener dichas mejoras. En los cultivos que requieren una alta demanda de agua, como es el de arroz, se aplican diferentes técnicas de riego para lograr bajar la demanda hídrica y seguir obteniendo altos rindes. No obstante, se siguen presentando dificultades para realizar un monitoreo óptimo y en tiempo real. El presente trabajo se desarrolla en el IDTILAB de la Facultad de Ciencia y Tecnología de UADER (Concepción del Uruguay, Entre Ríos), en conjunto con la seccional de INTA (Instituto Nacional de Tecnología Agropecuaria, Concepción del Uruguay), y presenta un modelo de comportamiento y prototipo innovador para monitorear cultivos de precisión en tiempo real. Fundado en lo más reciente de la minería de datos temporal, emplea una extensión de los conocidos Sistemas Armónicos (HS por sus siglas en inglés) (Lopez de Luise D. 2013) denominada Sistemas Armónicos difusos (Fuzzy Harmonic System, FHS) (Lopez de Luise D. 2013a , 2013b) (Bel W. 2018) que constituye un heurístico simple y liviano capaz de detectar y predecir los eventos críticos de estrés hídrico en los lotes de los cultivos de arroz. Se presenta el prototipo funcional de KRONOS.AgroData y KRONOS.AgroMonitor que implementa el modelo FHS adaptado para la predicción del nivel de riesgo de sequía en los lotes de riego en cultivos de arroz de la zona de San Salvador ubicada en (Entre Ríos) y en la zona de INTA, Concepción del Uruguay (Entre Ríos). Este prototipo está realizado con tecnología Arduino para la adquisición de datos y tecnologías web como React®, NextJS®, NodeJS® y MQTT®. El diseño permite evaluar el rendimiento y eficiencia del modelo propuesto en un entorno real de prueba de campo donde intervienen variables de diverso tipo (climatológicas, variaciones de humedad en suelo, nivel hídrico en suelo, PH, entre otras). De los estudio de campo y los análisis estadísticos que se muestran en este trabajo, se puede afirmar que el modelo derivado permite determinar intervalos de muestreo y riego mucho más adecuados que los tradicionales, y evaluar satisfactoriamente los rindes y condiciones de cultivo.


2015 ◽  
Vol 0 (0) ◽  
Author(s):  
Viktor Hofmann ◽  
Gleb Kleyman ◽  
Jens Twiefel

AbstractIn this article the modeling of a broadband energy harvester utilizing piezoelectric and electromagnetic effects for rotational applications is presented. The hybrid energy harvester consists of a one-side-clamped piezoelectric bimorph with a solenoid on the free end and is excited periodically but non-harmonically by magnets that are fixed on a rotating object. To estimate and describe the performance of the energy harvester concept a linear semi-analytical model for the bimorph and the solenoid is developed and then enhanced for non-harmonic system oscillations by decomposing them into their harmonic components. A comparison between the calculated and measurement signals of a prototype device shows great conformity. According to model-based and experimental analysis, the hybrid system has good broadband behavior regarding electric power output. That aspect makes the device a perfect energy-harvesting system for application with highly fluctuating revolution speeds like miniature wind turbines.


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