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3 results on '"Powell, Sara"'

1. Effective Word-Problem Instruction: Using Schemas to Facilitate Mathematical Reasoning

Author

Powell, Sara R. and Fuchs, Lynn S.

Abstract

Many general and special education teachers across the U.S. teach word problems by defining problems as a single operation (e.g., "Today, we're working on subtraction word problems") and linking key words (e.g., more, altogether, share, twice) to specific operations (e.g., share means to divide). Unfortunately, teaching students to approach word problems in these ways discourages mathematical reasoning and frequently produces incorrect answers. In Table 1, we list eight common key words, identify the operation typically associated with each, and provide word problems that illustrate how reliance on key words can result in incorrect answers. Neither of these approaches--defining problems in terms of a single operation or linking key words to specific operations--has evidence to support its use. [This article was published in "Teaching Exceptional Children" v51 p31-42 2018 (EJ1190453).]

Published
2018
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2. A Very Sensitive 21cm Survey for Galactic High-Velocity HI

Author

Lockman, Felix J., Murphy, Edward M., Petty-Powell, Sara, and Urick, Vincent J.

Subjects
Astrophysics
Abstract

Very sensitive HI 21cm observations have been made in 860 directions at dec >= -43deg in search of weak, Galactic, high-velocity HI emission lines at moderate and high Galactic latitudes. One-third of the observations were made toward extragalactic objects. The median 4-sigma detection level is NHI = 8x10^{17} cm^-2 over the 21' telescope beam. High-velocity HI emission is detected in 37% of the directions; about half of the lines could not have been seen in previous surveys. The median FWHM of detected lines is 30.3 km/s. High- velocity HI lines are seen down to the sensitivity limit of the survey implying that there are likely lines at still lower values of NHI. The weakest lines have a kinematics and distribution on the sky similar to that of the strong lines, and thus do not appear to be a new population. Most of the emission originates from objects which are extended over several degrees; few appear to be compact sources. At least 75%, and possibly as many as 90%, of the lines are associated with one of the major high-velocity complexes. The Magellanic Stream extends at least 10 deg to higher Galactic latitude than previously thought and is more extended in longitude as well. Although there are many lines with low column density, their numbers do not increase as rapidly as NHI^-1, so most of the HI mass in the high-velocity cloud phenomenon likely resides in the more prominent clouds. The bright HI features may be mere clumps within larger structures, and not independent objects., Comment: 88 pages includes 22 figures Accepted for Publication in ApJ Suppl. June 2002

Published
2002
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3. Teaching with Primary Sources: Looking at the Support Needs of Instructors

Author

Tanaka, Kurtis, primary, Abosso, Daniel, additional, Appiah, Krystal, additional, Atkins, Katie, additional, Barr, Peter, additional, Barrutia-Wood, Arantza, additional, Baydoun, Shatha, additional, Bazela, Catherine, additional, Bertram, Cara, additional, Boff, Colleen, additional, Borrelli, Steve, additional, Bravent, Jay-Marie, additional, Brennan, Sarah, additional, Budzise-Weaver, Tina, additional, Burri, Margaret, additional, Cheney, Liz, additional, Coker, Cait, additional, Cole, Heather, additional, Conathan, Lisa, additional, Cook, Emily, additional, Cooper, Danielle, additional, Dacey, Joshua, additional, Daines III, J. Gordon, additional, Dill, Diana, additional, Donovan, Carrie, additional, DuBois, Lori, additional, Duncan, Lisa, additional, Evelyn, Sarah, additional, Feeney, Mary, additional, Figueroa, Patricia, additional, Friedman, Rebecca, additional, Fuentes, Myranda, additional, Gabbard, Danielle, additional, Gandolfi, Eleanora, additional, Gerson, Chloe, additional, Godfrey, Kelly, additional, Grafe, Melissa, additional, Gunn, Brenda, additional, Haas, Jeanann, additional, Heidenwolf, Terese, additional, Herr, Heidi, additional, Hibbler, Laura, additional, Hill, Matthew J. K., additional, Hirsch, David, additional, Hunker, Stefanie, additional, Johnson, Janie, additional, Kader, Emily, additional, Keyes, Jessica, additional, Kiser, Paula, additional, Kitchens, Joel D., additional, Kopp, Maggie, additional, Laas, Andrew, additional, Landis, Bill, additional, Larson, Christine, additional, Lewis, David, additional, Logue, Sara, additional, Maryanski, Maureen, additional, Meehan, Jennifer, additional, Miller, Ruthann, additional, Miller Waltz, Rebecca, additional, Miner, Meg, additional, Morris, Sarah, additional, O'Sullivan, Kevin, additional, Oliver, Catherine, additional, Olson, Barbara, additional, Peale, Anne, additional, Phillips, Matt, additional, Pickens, Roxane, additional, Porterfield, Julie, additional, Powell, Sara, additional, Robyns, Marcus, additional, Ruediger, Dylan, additional, Scaggs, Deirdre, additional, Schweir, Carrie, additional, Sheehy, Matthew, additional, Shibata, Nicole, additional, Skeem, Dainan M., additional, Snyder, Holly, additional, Stepp, Linda, additional, Strandmark, Matthew, additional, Swan, Morgan, additional, Sweetser, Michelle, additional, Swift, Gabriel, additional, Tomberlin, Jason, additional, Wallace, Niamh, additional, Webster, Berenika, additional, Werlinich, Ashley, additional, Withers, Clare, additional, and Xu, Lijuan, additional

Published
2021
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