Ion-Driven Instabilities in the Inner Heliosphere II: Classification and Multi-Dimensional Mapping

Linear theory is a well developed framework for characterizing instabilities in weakly collisional plasmas, such as the solar wind. In the previous instalment of this series, we analyzed ~1.5M proton and alpha particle Velocity Distribution Functions (VDFs) observed by Helios I and II to determine the statistical properties of the standard instability parameters such as the growth rate, frequency, the direction of wave propagation, and the power emitted or absorbed by each component, as well as to characterize their behavior with respect to the distance from the Sun and collisional processing. In this work, we use this comprehensive set of instability calculations to train a Machine Learning algorithm consisting of three interlaced components that: 1) predict if an interval is unstable from observed VDF parameters; 2) predict the instability properties for a given unstable VDF; and 3) classify the type of the unstable mode. We use these methods to map the properties in multi-dimensional phase space to find that the parallel-propagating, proton-core-induced Ion Cyclotron mode dominates the young solar wind, while the oblique Fast Magnetosonic mode regulates the proton beam drift in the collisionally old plasma

ECHOES OF THE MASTER: A MULTI-DIMENSIONAL MAPPING OF ENRIQUE GRANADOS’ PEDAGOGICAL METHOD AND PIANISTIC TRADITION

The interpretation of the piano works of Enrique Granados has challenged musicologists and performers for decades. The performances of Granados have often been described as improvisatory and spontaneous, as if his creative artistry and natural talent denied following any rigid rules. He did not like to perform the same work in the same way more than once and even his compositional process was one of continual evolution. Further, anecdotes about Granados as teacher describe the way he encouraged his students to try different approaches in the performance of his pieces. However, this description of him as a relaxed and rather free spirit might be somewhat misleading. The pedagogical methods of Granados contain painstaking descriptions and guidelines for students and his comprehensive theoretical methods are supplemented by a series of practical exercises, some of which he demanded his students follow rigidly. In an effort to reconcile both sides of his artistic temperament and to steer the student of Granados’ piano works in the right direction, attempts have been made to develop authoritative editions of his works through the analysis of his recordings and scores under the supervision of well-known interpreters of his piano music. This thesis proposes that the formulation of an authentic interpretation of Granados’ piano music involves a fresh look at the source material. It re-examines Urtext in the light of additional, more up to date analytical approaches and reveals consistencies between his pedagogical methods and his own performances. It also draws on the knowledge and reminiscences of Spanish pianists who play an incredibly important role in terms of their direct lineage to the Granados/Catalan piano school, but who are perhaps not so well-known outside of the Spanish musical community. This shared information is brought together for the first time in this thesis and helps to colour a more vivid and complete portrait of one the most important Spanish musicians of all time

ECHOES OF THE MASTER: A MULTI-DIMENSIONAL MAPPING OF ENRIQUE GRANADOS’ PEDAGOGICAL METHOD AND PIANISTIC TRADITION

The interpretation of the piano works of Enrique Granados has challenged musicologists and performers for decades. The performances of Granados have often been described as improvisatory and spontaneous, as if his creative artistry and natural talent denied following any rigid rules. He did not like to perform the same work in the same way more than once and even his compositional process was one of continual evolution. Further, anecdotes about Granados as teacher describe the way he encouraged his students to try different approaches in the performance of his pieces. However, this description of him as a relaxed and rather free spirit might be somewhat misleading. The pedagogical methods of Granados contain painstaking descriptions and guidelines for students and his comprehensive theoretical methods are supplemented by a series of practical exercises, some of which he demanded his students follow rigidly. In an effort to reconcile both sides of his artistic temperament and to steer the student of Granados’ piano works in the right direction, attempts have been made to develop authoritative editions of his works through the analysis of his recordings and scores under the supervision of well-known interpreters of his piano music. This thesis proposes that the formulation of an authentic interpretation of Granados’ piano music involves a fresh look at the source material. It re-examines Urtext in the light of additional, more up to date analytical approaches and reveals consistencies between his pedagogical methods and his own performances. It also draws on the knowledge and reminiscences of Spanish pianists who play an incredibly important role in terms of their direct lineage to the Granados/Catalan piano school, but who are perhaps not so well-known outside of the Spanish musical community. This shared information is brought together for the first time in this thesis and helps to colour a more vivid and complete portrait of one the most important Spanish musicians of all time

Surfing the Waves: Live Audio Mosaicing of an Electric Bass Performance as a Corpus Browsing Interface

In this paper, the authors describe how they use an electric bass as a subtle, expressive and intuitive interface to browse the rich sample bank available to most laptop owners. This is achieved by audio mosaicing of the live bass performance audio, through corpus-based concatenative synthesis (CBCS) techniques, allowing a mapping of the multi-dimensional expressivity of the performance onto foreign audio material, thus recycling the virtuosity acquired on the electric instrument with a trivial learning curve. This design hypothesis is contextualised and assessed within the Sandbox#n series of bass+laptop meta-instruments, and the authors describe technical means of the implementation through the use of the open-source CataRT CBCS system adapted for live mosaicing. They also discuss their encouraging early results and provide a list of further explorations to be made with that rich new interface

Granados’ Secrets Revealed by His Piano Rolls

During the early twentieth century, a new and more sophisticated form of recording using piano roll technology was presented to pianists. The reproducing piano system was able to capture the fine subtleties of their artistry with much more detail than previous recording methods. The performance style of Enrique Granados can be gleaned from the numerous piano rolls he made until his very last recordings just a few months before his death in March 1916. His renditions are listed in Welte-Mignon, Duo-Art, Pleyela, Artecho and Hupfeld catalogues. His performance of Valses poéticos is captured on Hupfeld and Welte-Mignon piano rolls. The analysis of both transcriptions reveal ground-breaking facts not only on the performance style of Granados but also provide an empirical document that proves the authenticity of the Hupfeld Animatic rolls no. 51125ab (DEA roll no. 28419). This study also includes musical discussions on historical performance practice and pedagogical methodologies of Granados’ pianistic tradition

Noise-tolerant approximate blocking for dynamic real-time entity resolution

Entity resolution is the process of identifying records in one or multiple data sources that represent the same real-world entity. This process needs to deal with noisy data that contain for example wrong pronunciation or spelling errors. Many real world applications require rapid responses for entity queries on dynamic datasets. This brings challenges to existing approaches which are mainly aimed at the batch matching of records in static data. Locality sensitive hashing (LSH) is an approximate blocking approach that hashes objects within a certain distance into the same block with high probability. How to make approximate blocking approaches scalable to large datasets and effective for entity resolution in real-time remains an open question. Targeting this problem, we propose a noise-tolerant approximate blocking approach to index records based on their distance ranges using LSH and sorting trees within large sized hash blocks. Experiments conducted on both synthetic and real-world datasets show the effectiveness of the proposed approach

Single/Double-Spin Asymmetry Measurements of Semi-Inclusive Pion Electroproduction on a Transversely Polarized 3He Target through Deep Inelastic Scattering

Parton distribution functions, which represent the flavor and spin structure of the nucleon, provide invaluable information in illuminating quantum chromodynamics in the confinement region. Among various processes that measure such parton distribution functions, semi-inclusive deep inelastic scattering is regarded as one of the golden channels to access transverse momentum dependent parton distribution functions, which provide a 3-D view of the nucleon structure in momentum space. The Jefferson Lab experiment E06-010 focuses on measuring the target single and double spin asymmetries in the 3He(e, e'pi+,-)X reaction with a transversely polarized 3He target in Hall A with a 5.89 GeV electron beam. A leading pion and the scattered electron are detected in coincidence by the left High-Resolution Spectrometer at 16\circ and the BigBite spectrometer at 30\circ beam right, respectively. The kinematic coverage concentrates in the valence quark region, x \sim0.1-0.4, at Q2 \sim 1-3 GeV2. The Collins and Sivers asymmetries of 3He and neutron are extracted. In this review, an overview of the experiment and the final results are presented. Furthermore, an upcoming 12-GeV program with a large acceptance solenoidal device and the future possibilities at an electron-ion collider are discussed.Comment: 14 pages, 6 figures, to be published in Modern Physics Letters

Comparing the Online Learning Capabilities of Gaussian ARTMAP and Fuzzy ARTMAP for Building Energy Management Systems

Recently, there has been a growing interest in the application of Fuzzy ARTMAP for use in building energy management systems or EMS. However, a number of papers have indicated that there are important weaknesses to the Fuzzy ARTMAP approach, such as sensitivity to noisy data and category proliferation. Gaussian ARTMAP was developed to help overcome these weaknesses, raising the question of whether Gaussian ARTMAP could be a more effective approach for building energy management systems? This paper aims to answer this question. In particular, our results show that Gaussian ARTMAP not only has the capability to address the weaknesses of Fuzzy ARTMAP but, by doing this, provides better and more efficient EMS controls with online learning capabilities