756 research outputs found
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Improvising Compose Yourself
The post–World War II era in the USA saw the emergence of a high–modernist discursive project begun by Milton Babbitt (1916–2011) and
students collected around him at Princeton University. But around 1970 the sustaining premises of musical discourse as a scientific pursuit were challenged by some of Babbitt's own students. A drastic Turn occurred, and perhaps the single most decisive moment in the Turn was J. K. Randall’s (1929–2014) publication of the first few sections of Compose Yourself—A Manual for the Young. This article takes place in two parts: the first offers transcriptions of portions of Randall’s drafts for Compose Yourself, and a quotation from an interview with him, both housed at the New York Public Library for the Performing Arts. During the longer part two, I offer my own improvisatory, experimental analysis or close reading of sections of Compose Yourself. The goal being to shed further light on an important document in the history of American experimentalism
An intelligent decision-making system for flood monitoring from space
This paper presents the results of a feasibility study on intelligent image processing and decision-making for flood monitoring on board satellites. The ability to detect temporal changes in images is one of the most important functions in intelligent image processing systems for hazard and disaster monitoring applications. An automatic change detection system is proposed, the purpose of which is to monitor particular areas on Earth and give warnings to the authorities if any flooding events are detected. A novel solution to flood detection based on combined use of optical multispectral imagery and GPS reflectometry data is introduced. A fuzzy inference engine is used in the decision-making process, which generates control signals to other subsystems on board the satellite
Sensing Ocean, Ice and Land Reflected Signalsfrom Space: Results from the UK-DMC GPS Reflectometry Experiment
The use of Global Navigation Satellite System (GNSS) signals reflected from the Earth\u27s surface has progressed from its beginnings in the early 1990\u27s to a demonstrated practical linkage of measurements to geophysical characteristics of ocean, ice and land surfaces.
A pioneering space-based experiment was carried on the UK-DMC satellite launched in September of 2003. The GPS receiver on the satellite was modified to accommodate a downward (nadir) pointing medium gain antenna and to send sampled IF data to a solid-state data recorder [1]. Since its launch it has been successfully used to target and detect specular reflections of GPS signals after scattering from the Earth\u27s oceans, ice sheetsand land surfaces. All data collections under a wide range of conditions have revealed reflected signals, including signals reflected off the ocean under reasonably rough ocean conditions. This demonstrates convincingly that GNSS Reflectometry (or GNSS Bistatic Radar) is a valid future technology for space based Earth remote sensing, even when using modest antenna gain configurations such as that deployed on the UK-DMC low Earth orbiting satellite.
This paper presents a summary of the signals collected from over the ocean, and an examination of the signal relationship to the ocean wind and wave conditions is presented. The preliminary results from ice and land surfaces reflection analysis are also described.
Reprinted with permission from The Institute of Navigation (http://ion.org/) and The Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation, (pp. 1679-1685). Fairfax, VA: The Institute of Navigation
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Princeton Theory's Problematics
This dissertation situates historically a group of philosophical problematics informing a thread of post-World War II American music theory, begun at Princeton University under Milton Babbitt (1916-2011) and his students. I historicize and demonstrate the logics behind, without attempting to explain away, problematic notions from experimentalism to experience, solipsism to ethics. Initially a formalist project, Princeton Theory in the early 1970's underwent an under-discussed Turn toward experimentalism, seemingly rejecting its earlier high-modernist orientation. The dissertation situates this Turn as an auto-critique and provides a variety of hermeneutics for the Turn. I discuss how Princeton Theory before the Turn problematically situated itself as both a logical positivist or empiricist discourse, wherein musical experience plays a foundational role, and a formalist, conceptual, discourse, complicating the claim that Princeton Theorists were unconcerned with music hearing as such. Because musical experience seems to be personal, not sharable, I historicize Princeton Theory's uneven appeals to the notion of solipsism--that only the listening or theorizing "I" exists--and question this position's implications for ethics, arguing that Babbitt and his students have been more concerned with ethics and morality than their formalist commitments may imply. This dissertation offers a sustained discussion and critique of mid-century high-modernist formalism, raising the stakes of our understanding of this foundational discourse for modern music theory by showing its historical situatedness, contentious status even for the practitioners involved, and what claims it may still make on our own musical imaginations
Response time of mean square slope to wind forcing: An empirical investigation
We present an empirical study of the response time of surface wave mean square slope to local wind forcing using data collected over 11 years by 46 discus buoys moored at a wide variety of locations. The response time is defined as the time lag at which the time dependence of the waves exhibits the highest correlation with that of the local wind speed. The response time at each location is found to be fairly stable, with the time varying between 0.4 and 1.8 h depending on the location. Examination of long‐term statistics reveals response time dependencies on wind speed magnitude, fetch, atmospheric stability, and wavelength. With the increasing reliance on satellite microwave remote sensing as a source of wind data, these results provide useful insights and bounds for their use.Key Points:Mean squared slope measured by buoys responds to wind forcing in 0.4–1.8 hThe response time depends on wind speed, fetch, atmospheric stability, and wavelengthPeer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/142436/1/jgrc21693_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/142436/2/jgrc21693.pd
A Nanosatellite to Demonstrate GPS Oceanography Reflectometry
This paper describes a proposal for a rapid, low cost, nanosatellite mission to demonstrate the concept of GPS ocean reflectometry and to investigate the feasibility of determining sea state for a future operational space-based storm warning systems. The aims of this mission are to prove the general feasibility of GPS ocean reflectometry, to demonstrate sea state determination and to enable the development of a practical GPS ocean reflectometry payload for future missions. The payloads on the satellite consist of a 24 channel C/A code SGR-10 space GPS receiver and a solid state data recorder. The GPS receiver has one standard RHCP zenith antenna, and one high gain LHCP nadir antenna for receiving the reflected signals. A dual approach is taken to measurement gathering. Initially, bursts of directly sampled IF data are stored and downloaded to permit processing of the data on the ground. Later in the mission, the GPS receiver software may be modified to permit the processing of signals on-board the satellite. The nanosatellite is based on SSTL’s SNAP design and has a projected total mass of around 12 kilograms; orbit average power of approximately 4.8 watts; 3-axis attitude control to 1-2 degrees; VHF uplink, S-band downlink at 500 kbps, and OBC based on the StrongARM SA1100. Using the SNAP design enables a fast manufacture at low cost: estimated at 9 months and around 2 million Euros, including launch. The proposed mission makes use of the Surrey Space Centre Mission Control ground-station in Guildford (UK) for control and data gathering. Surrey Satellite Technology Ltd (SSTL) is a world leader in both nanosatellite and GPS technology for small satellites. SSTL’s highly successful SNAP-1 nanosatellite launched in June 2000 demonstrated the potential of such small spacecraft, and this proposal involves the first ever use of a nanosatellite for a commercial application (GANDER) in collaboration with SOS Ltd (UK) a company specialising in oceanography from space
Advanced Supported Liquid Membranes for Carbon Dioxide Control in Extravehicular Activity Applications
There is disclosed a portable life support system with a component for removal of at least one selected gas. In an embodiment, the system includes a supported liquid membrane having a first side and a second side in opposition to one another, the first side configured for disposition toward an astronaut and the second side configured for disposition toward a vacuum atmosphere. The system further includes an ionic liquid disposed between the first side and the second side of the supported liquid membrane, the ionic liquid configured for removal of at least one selected gas from a region housing the astronaut adjacent the first side of the supported liquid membrane to the vacuum atmosphere adjacent the second side of the supported liquid membrane. Other embodiments are also disclosed
Interactive Video: A Report from the ACE Western Regional Workshop
The ACE workgroup involved communicators, educators and subject specialists from a number of states and Canada
The Drought Monitor
There is a need for improved drought monitoring and assessment methods in the United States. Drought is the most costly natural disaster [Federal Emergency Management Agancy (FEMA 1995; Wilhite 2000)], but it is often neglected by developers of assessment and forecast products. Drought is more nebulous than other disasters and does not lend itself to traditional assessments or forecast methods. Its relatively slow onset and the complexity of its impacts are reasons for the new assessment methodology. Improvements in drought monitoring and forecasting techniques will allow for better preparation, lead to better management practices, and reduce the vulnerability of society to drought and its subsequent impacts.
The Drought Monitor (additional information available online at http://drought.unl/edu/dm) was created with the goal of tracking and displaying the magnitude and spatial extent of drought and its impacts across the United States. The Drought Monitor is produced weekly and classifies drought severity into four major categories, with a fifth category threshold assigned to locations on a map are determined from a number of indicators, or tools, blended with subjective interpretation
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