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Topic Area: Environment/Climate
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Displaying records 411 to 420 of 444 records.
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411. The Stability of Low Radial Immersion Milling
Topic: Environment/Climate
Published: 1/1/2000
Authors: Matthew A. Davies, Jon Robert Pratt, Brian S. Dutterer, Timothy J Burns
Abstract: Traditional regenerative stability theory predicts a set of spindle speeds with locally optimum stability at integer fractions of the natural frequency of the most flexible mode of the system.  The assumptions of this theory become invalid for h ...

412. The Surprising Affects of Strain on the Long Term Rheology of Filled Viscoelastic Solids (Building Joint Sealant)
Topic: Environment/Climate
Published: 5/7/2008
Authors: Donald Lee Hunston, Kar T. Tan, Christopher C White
Abstract: Filled viscoelastic solids, have been used for the last 40 years as building sealants to separate indoor from outdoor environments.  The most important property of the sealant is the ability to respond to imposed strain while maintaining the cri ...

413. The development and certification of Standard Reference Materials (SRMs) to assess and ensure accurate measurement of Pb in the environment
Topic: Environment/Climate
Published: 8/1/2001
Authors: John D. Fassett, Bruce S MacDonald

414. The dynamics of chip formation in machining
Topic: Environment/Climate
Published: 1/1/1997
Authors: Matthew A. Davies, Christopher J. Evans, Timothy J Burns
Abstract: In this paper, we provide experimental, numerical and analytical evidence suggesting that the onset of segmented chip formation is the result of a Hopf bifurcation in the material flow. We modify the conventional one-dimensional model for orthogonal ...

415. The winter time South Pole tropospheric water vapor column: Comparisons of radiosonde and recent terahertz radiometry, use of the saturated column as a proxy measurement; and inference of decadal trends
Topic: Environment/Climate
Published: 7/7/2012
Authors: Richard Addison Chamberlin, Erich N Grossman
Abstract: We use a fifty year record of winter time radiosonde observations at the South Pole to estimate the precipitable water vapor column (PWV) over the entire period. Humidity data from older radiosondes is of limited reliability; however, we think an est ...

416. Thermal Imaging of Metals in a Kolsky-Bar Apparatus
Topic: Environment/Climate
Published: 1/1/2003
Authors: Eric Paul Whitenton, Richard L. Rhorer, Howard W Yoon, D Basak, Richard Joel Fields, Lyle E Levine, Timothy J Burns
Abstract: For materials testing at elevated temperatures, we describe the design and the development of a resistively heated Kolsky-bar apparatus. The temperature of the sample is determined by non-contact thermometry and the spatial temperature gradients in t ...

417. Thermochemistry of Ammonium Nitrate, NH4NO3, in the Gas Phase
Topic: Environment/Climate
Published: 10/7/2010
Author: Karl K Irikura
Abstract: Hildenbrand and coworkers have shown recently that the vapor above solid ammonium nitrate includes molecules of NH4NO3, not only NH3 and HNO3 as previously believed. Their measurements led to thermochemical values that imply an enthalpy change of D2 ...

418. Thermomechanical Oscillations in Material Flow During High-Speed Machining
Topic: Environment/Climate
Published: 4/1/2001
Authors: Matthew A. Davies, Timothy J Burns
Abstract: This paper presents a nonlinear dynamics approach for predicting the transition from continuous to shear-localized chip formation in machining. Experiments and a simplified one-dimensional model of the flow both show that, as cutting speed is increa ...

419. Time Domain Modal Estimation
Topic: Environment/Climate
Published: 1/1/1998
Authors: S Fahey, Jon Robert Pratt
Abstract: In a previous technical feature,2 we described some motives for performing structural dynamic tests and subsequently reviewed some frequency domain techniques for uncovering modal parameters. This time, we take up some applicable time domain algorith ...

420. Tool Point Frequency Response Prediction for High-Speed Machining by RCSA
Topic: Environment/Climate
Published: 11/1/2001
Authors: Tony L Schmitz, Michael Kennedy, Matthew A. Davies
Abstract: The implementation of high-speed machining for the manufacture of discrete parts requires accurate knowledge of the system dynamics. We describe the application of receptance coupling substructure analysis (RCSA) to the analytic prediction of the too ...

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