293 research outputs found
The honorable Mrs. Griffiths
"Mrs. Martha Wright Griffiths, who was graduated from the University of Missouri in 1934, is a fierce and articulate advocate of the rights and independence of women."--Page 2
Contributors to the Fall Issue/Notes
Notes by John F. Bodle, James V. Oberfell, John J. Cauley, John G. Smith, E. A. Steffen, Jr., and E. L. Twohey
Recent Decisions
Comments on recent decisions by Sidney Baker, John C. Castelli, John J. Cauley, Francis W. Collopy, Arthur B. Curran, Jr., Louis F. DiGiovanni, Francis J. Keating, William G. Mahoney, Jr., James D. Matthews, James W. Oberfell, John B. Palmer, Louis P. Peck, George Ratterman, Henry M. Shine, Jr., John G. Smith, James M. Wetzel, and Dale A. Winnie
Recent Decisions
Comments on recent decisions by William A. Adler, John F. Bodle, John J. Cauley, Richard H. Keoughan, James W. Oberfell, William V. Phelan, George Ratterman, John G. Smith, E. A. Steffen, Jr., James K. Sugnet, and Edward L. Twohey
Linking Signatures of Accretion with Magnetic Field Measurements - Line Profiles are not Significantly Different in Magnetic and Non-Magnetic Herbig Ae/Be Stars
Herbig Ae/Be stars are young, pre-main-sequence stars that sample the
transition in structure and evolution between low- and high-mass stars,
providing a key test of accretion processes in higher-mass stars. Few Herbig
Ae/Be stars have detected magnetic fields, calling into question whether the
magnetospheric accretion paradigm developed for low-mass stars can be scaled to
higher masses. We present He I 10830 \AA\ line profiles for 64 Herbig Ae/Be
stars with a magnetic field measurement in order to test magnetospheric
accretion in the physical regime where its efficacy remains uncertain. Of the 5
stars with a magnetic field detection, 1 shows redshifted absorption,
indicative of infall, and 2 show blueshifted absorption, tracing mass outflow.
The fraction of redshifted and blueshifted absorption profiles in the
non-magnetic Herbig Ae/Be stars is remarkably similar, suggesting that the
stellar magnetic field does not affect gas kinematics traced by He I 10830 \AA.
Line profile morphology does not correlate with the luminosity, rotation rate,
mass accretion rate, or disk inclination. Only the detection of a magnetic
field and a nearly face-on disk inclination show a correlation (albeit for few
sources). This provides further evidence for weaker dipoles and more complex
field topologies as stars develop a radiative envelope. The small number of
magnetic Herbig Ae/Be stars has already called into question whether
magnetospheric accretion can be scaled to higher masses; accretion signatures
are not substantially different in magnetic Herbig Ae/Be stars, casting further
doubt that they accrete in the same manner as classical T Tauri stars.Comment: accepted to ApJ; 17 pages, 4 figures, 3 table
The NCTM Standards: Implementation
In 1989 the National Council of Teachers of Mathematics published the Curriculum and Evaluation Standards for School Mathematics. The NCTM standards provides benchmark statements about specific aspects of the curriculum and about evaluation against which school divisions can judge their own specific curricula. The Standards has been a major focus of mathematics education since 1990.
In the fall of 1992 the Metropolitan Educational Research Consortium undertook a study to determine the extent to which local schools were implementing the NCTM Standards. The study of the schools in the Consortium focused on the broad themes of the Standards document: mathematics as problem-solving, mathematics as communication, mathematics as reasoning, and mathematical communication. To teach with these four standard in mind is to teach in a Standards-oriented manner. This report summarizes the finding of three data sources collected from elementary, middle, and secondary school teachers and principals in the MERC school divisions: a survey of teachers, a survey of principals, and focus group interviews of selected teachers. The questions and discussions explore awareness of the Standards, classroom practices, and aids the obstacles to implementation
The telemedicine spacebridge project: A joint US/Russian venture in long distance medicine via satellite
The Telemedicine Spacebridge Demonstration Project is a joint U.S./Russian program whose purpose is to further the application of telemedicine both internationally, domestically, and in space. The system has been set up to use a Russian satellite over the Atlantic Ocean and a U.S. domestic satellite to allow physicians a two-way video and audio link between various sites of medical centers in the United States and the Central Hospital in Moscow, Russia. This paper contains a description of the project background, the Spacebridge system, the individual pieces of the system, and the operational experience gained thus far in the project
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