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840 results on '"Krafft C"'

155. A trial-by-trial analysis reveals more intense physical activity is associated with better cognitive control performance in attention-deficit/hyperactivity disorder.

Author

Hartanto, T. A., Krafft, C. E., Iosif, A. M., and Schweitzer, J. B.

Subjects
*ATTENTION-deficit hyperactivity disorder, *LEARNING disabilities, *COGNITIVE ability, *CHILD research, *WAKEFULNESS
Abstract

Hyperactivity is a key symptom and the most observable manifestation of attention-deficit/hyperactivity disorder (ADHD). The over-activity associated with ADHD can cause specific challenges in academic settings, extracurricular activities and social relationships. Cognitive control challenges are also well established in ADHD. The current study included 44 children between the ages of 10 and 17 diagnosed with ADHD or who were typically developing (TD), all of whom had no psychiatric co-morbidity or significant learning disorders. Participants wore an actometer on their ankle while performing a flanker paradigm in order to objectively measure their rates of activity in association with cognitive control. Analyses assessed the relationship between frequency and intensity of activity to task accuracy on a trial-by-trial basis. A significant interaction effect between group and performance revealed that more intense movement was associated with better performance in the ADHD group but not in the TD group. The ADHD group demonstrated more intense activity than the TD group during correct (but not error) trials. Within-group, children with ADHD generated higher intensity movements in their correct trials compared to their error trials, whereas the TD group did not demonstrate any within-group differences. These findings suggest that excessive motoric activity associated with clinically significant ADHD symptoms may reflect compensatory efforts to modulate attention and alertness. Future research should systematically explore the relationship between motion in ADHD and how it might be used to improve cognitive performance. [ABSTRACT FROM PUBLISHER]

Published
2016
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158. Spin-current-induced magnetization reversal in magnetic nanowires with constrictions

Author

Florez, S. H., Florez, S. H., Krafft, C., Gomez, R. D., Florez, S. H., Florez, S. H., Krafft, C., and Gomez, R. D.

Abstract

We have performed experiments on current-induced domain-wall motion sCIDWMd in the case of the domain walls sDWd trapped within the nanoscale constrictions in patterned NiFe structures. Direct observation of current-induced magnetization reversal was achieved and critical current densities jc were measured in the presence of easy-axis magnetic fields. The direction of CIDWM was found to be along the direction of the electron motion in absence of an applied magnetic field and in the direction of the field when in the presence of even relatively weak fields. Data for the field dependence of jc for both uniform and fast rising pulses suggest that the current, regardless of polarity, assists in the depinning of the DW. Only for the dc case does the data strongly reveal the influence of the electron pressure in promoting or hindering DW motion.

Published
2005

178. Tumor Models (In Vivo/In Vitro)

Author

Doucette, T. A., primary, Kong, L.-Y., additional, Yang, Y., additional, Wei, J., additional, Wang, J., additional, Fuller, G. N., additional, Heimberger, A. B., additional, Rao, G., additional, Ajewung, N., additional, Kamnasaran, D., additional, Katz, A. M., additional, Amankulor, N., additional, Squatrito, M., additional, Hambardzumyan, D., additional, Holland, E. C., additional, Poschl, J., additional, Lorenz, A., additional, Von Bueren, A., additional, Li, S., additional, Peraud, A., additional, Tonn, J.-C., additional, Herms, J., additional, Xiang, M., additional, Rutkowski, S., additional, Kretzschmar, H., additional, Schuller, U., additional, Studebaker, A., additional, Raffel, C., additional, Aoki, Y., additional, Hashizume, R., additional, Ozawa, T., additional, Gupta, N., additional, James, C. D., additional, Navis, A. C., additional, Hamans, B. C., additional, Claes, A., additional, Heerschap, A., additional, Wesseling, P., additional, Jeuken, J. W., additional, Leenders, W. P., additional, Agudelo, P. A., additional, Williams, S., additional, Nowicki, M. O., additional, Johnson, J., additional, Li, P. K., additional, Chiocca, E. A., additional, Lannutti, J. J., additional, Lawler, S. E., additional, Viapiano, M. S., additional, Bergeron, J., additional, Aliaga, A., additional, Bedell, B., additional, Soderquist, C., additional, Sonabend, A., additional, Lei, L., additional, Crisman, C., additional, Yun, J. P., additional, Sisti, J., additional, Castelli, M., additional, Bruce, J. N., additional, Canoll, P., additional, Kirsch, M., additional, Stelling, A., additional, Salzer, R., additional, Krafft, C., additional, Schackert, G., additional, Steiner, G., additional, Balvers, R. K., additional, van den Hengel, S. K., additional, Wakimoto, H., additional, Hoeben, R. C., additional, Leenstra, S., additional, Dirven, C. M., additional, Lamfers, M. L., additional, Sabha, N. S., additional, Agnihotri, S., additional, Wolf, A., additional, von Deimling, A., additional, Croul, S., additional, Guha, A., additional, Trojahn, U. S., additional, Lenferink, A., additional, O'Connor-McCourt, M., additional, Kanai, R., additional, Curry, W. T., additional, Yip, S., additional, Barnard, Z. R., additional, Mohapatra, G., additional, Stemmer-Rachamimov, A. O., additional, Martuza, R. L., additional, Rabkin, S. D., additional, Binder, Z. A., additional, Salmasi, V., additional, Lim, M., additional, Weingart, J., additional, Brem, H., additional, Olivi, A., additional, Riggins, G. J., additional, Gallia, G. L., additional, Rong, Y., additional, Zhang, Z., additional, Gang, C., additional, Tucker-Burden, C., additional, Van Meir, E., additional, Brat, D. J., additional, Kloezeman, J. J., additional, Kleijn, A., additional, French, P. J., additional, Spoor, J. K., additional, Bazzoli, E., additional, Fomchenko, E. I., additional, Schultz, N., additional, Brennan, C., additional, DeAngelis, L. M., additional, Nimer, S. D., additional, Mohyeldin, A., additional, Hsu, W., additional, Shah, S. R., additional, Adams, H., additional, Shah, P., additional, Katuri, L., additional, Kosztowski, T., additional, Loeb, D. M., additional, Wolinsky, J.-P., additional, Gokaskan, Z. L., additional, Quinones-Hinojosa, A., additional, Daphu, I. K., additional, Immervoll, H., additional, Bjerkvig, R., additional, Thorsen, F., additional, Caretti, V., additional, Idema, S., additional, Zondervan, I., additional, Meijer, D. H., additional, Lagerweij, T., additional, Barazas, M., additional, Vos, W., additional, Hamans, B., additional, van der Stoop, P., additional, Hulleman, E., additional, van der Valk, P., additional, Bugiani, M., additional, Vandertop, W. P., additional, Noske, D., additional, Kaspers, G. J., additional, Molthoff, C., additional, Wurdinger, T., additional, Chow, L. M., additional, Endersby, R., additional, Zhu, X., additional, Rankin, S., additional, Qu, C., additional, Zhang, J., additional, Ellison, D. W., additional, Baker, S. J., additional, Tabar, V., additional, LaFaille, F., additional, and Studer, L., additional

Published
2010
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184. Current-controlled bi-stable domain configurations in Ni81Fe19 elements: An approach to magnetic memory devices

Author

Koo, H., Koo, H., Krafft, C., Gomez, R. D., Koo, H., Koo, H., Krafft, C., and Gomez, R. D.

Abstract

The discovery of current-switchable bi-stable remanent domain configurations on small ferromagnetic islands is reported. Rectangular NiFe islands with a thickness of 50 to 100 nm and lateral dimensions on the order of several microns were imaged using magnetic force microscopy after application of 10 ns current pulses through the material. The closure configuration can be set into either the 4 or 7 domain configuration by applying positive or negative current polarity at density on the order 107 A/cm2. The chirality of the closure patterns is fixed, implying that only two rather than four states are stable in these patterns. The possibility of using these configurations as a means of storing a logic state for memory applications is discussed.

Published
2002

191. Spin-stand imaging of overwritten data and its comparison with magnetic force microscopy

Author

Mayergoyz, I. D., Mayergoyz, I. D., Tse, C., Krafft, C., Gomez, R. D., Mayergoyz, I. D., Mayergoyz, I. D., Tse, C., Krafft, C., and Gomez, R. D.

Abstract

A new technique of magnetic imaging on a spin-stand [Mayergoyz et al., J. Appl. Phys. 87, 6824 (2000)] is further developed and extensively tested. The results of successful imaging of digital patterns overwritten with misregistration ranging from 0.3 to 0.07 mm are reported. The results are compared with magnetic force microscopy (MFM) images and the conclusion is reached that the spin-stand imaging technique can provide (at least) the same level of resolution and accuracy as the MFM imaging technique.

Published
2001

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