Since its launch on 2 December 1995, the Solar and Heliospheric Observatory (SOHO) has provided an unparalleled breadth and depth of information about the sun, from its interior, through the hot and ...dynamic atmosphere, out to the solar wind. Analysis of the helioseismology data from SOHO has shed new light on a number of structural and dynamic phenomena in the solar interior, such as the absence of differential rotation in the radiative zone, subsurface zonal and meridional flows, subconvection-zone mixing, a possible circumpolar jet, and very slow polar rotation. The UV imagers and spectrometers have revealed an extremely dynamic solar atmosphere in which plasma flows play an important role. Evidence for an upward transfer of magnetic energy from the sun's surface toward the corona has been found. Electrons in coronal holes have been found to be relatively 'cool', whereas heavy ions are extremely hot and have highly anisotropic velocity distributions. The source region for the high-speed solar wind has been identified, and the acceleration profiles of both the slow and fast solar wind have been measured. (Author)
This study was designed to investigate the validity and reliability of the Motor-Free Visual Perception Test (MVPT) when used with mentally retarded subjects. Forty-six mentally retarded children's ...MVPT scores were correlated with CA, IQ, achievement ranking, and the matching and copying subtests of the Metropolitan Readiness Tests. Low magnitude nonsignificant correlations were obtained for CA and achievement, while significant high magnitude correlations resulted from IQ, matching, and copying. A reliability coefficient of .81 was obtained. The study lends initial support for use of the MVPT with mentally retarded subjects.
Readers' Dialogue Rappaport, David; Stibal, Willard; Franson, Joseph P. ...
The Arithmetic teacher,
09/1981, Letnik:
29, Številka:
1
Journal Article
The currency of letters to the editor of a journal lilte the
Arithmetic teacher
is always a problem. At the very best. four months will have elapsed between the time when an article is published and ...the time when a letter commenting on that article can appear in the journal. Sometimes the minimum time is even greater. For example, letters about an article that appears in a January issue will almost never appear before the following fall. The publication schedule alone dictates such a spread of time, and other factors can intervene to further delay publication of a letter.
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