4,605 research outputs found
Developing Cloud Chambers with High School Students
The result and outcome of the \textit{cloud chamber project}, which aims to
develop a cloud chamber useful for science education is reported in detail. A
project includes both three high school students and a teacher as a part of
Super Science High School (SSH) program in our school. We develop a
dry-ice-free cloud chamber using salt and ice (or snow). Technical details of
the chamber are described. We also argue how the project have affected
student's cognition, motivation, academic skills and behavior. The research
project has taken steps of professional researchers, i.e., in planning
research, applying fund, writing a paper and giving a talk in conferences. From
interviews with students, we have learnt that such style of scientific activity
is very effective in promoting student's motivation for learning science.Comment: 9 pages, accepted to the proceedings of APPC12 - the 12th Asia
Pacific Physics Conferenc
An improved method for determining the DC magnetization curve using a ring specimen
When the DC magnetization curve (B-H) of nonoriented material is measured in a ring specimen, there is an intrinsic error due to the assumption that the mean magnetic path length is equal to the mean geometric path length. A novel method for determining the B-H curve accurately is proposed. The validity of the method is verified by experiments</p
Spectroscopy of Candidate Members of the Eta Cha and MBM12 Young Associations
We present an analysis of candidate members of the Eta Cha and MBM 12A young
associations. For an area of 0.7 deg^2 toward Eta Cha, we have performed a
search for members of the association by combining JHK_s photometry from 2MASS
and i photometry from DENIS with followup optical spectroscopy at Magellan
Observatory. We report the discovery of three new members with spectral types
of M5.25-M5.75, corresponding to masses of 0.13-0.08 M_sun by theoretical
evolutionary models. Two and three of these members were found independently by
Lyo and coworkers and Song and coworkers, respectively. Meanwhile, no brown
dwarfs were detected in Eta Cha down to the completeness limit of 0.015 M_sun.
For MBM 12A, we have obtained spectra of three of the remaining candidate
members that lacked spectroscopy at the end of the survey by Luhman, all of
which are found to be field M dwarfs. Ogura and coworkers have recently
presented four "probable" members of MBM 12A. However, two of these objects
were previously classified as field dwarfs by the spectroscopy of Luhman. In
this work, we find that the other two objects are field dwarfs as well.Comment: to be published in The Astrophysical Journal, 19 pages, 7 figure
Strong Coupling Limit of Bethe Ansatz Solutions in Massive Thirring Model
We study the strong coupling limit of the Bethe ansatz solutions in the
massive Thirring model. We find analytical expressions for the energy
eigenvalues for the vacuum state as well as n-particle n- hole states. This
formula is compared with the numerical results and is found to achieve a very
good agreement.
Also, it is found that the 2-particle 2- hole and higher particle-hole states
describe n- free bosons states in this limit. The behaviors of the strong
coupling limit of the boson mass for various model calculations are examined.
We discuss an ambiguity of the coupling constant normalization due to the
current regularization.Comment: 15 pages, to appear in Ann. Phys. 281 (2000), Ma
Effects of Cattle Grazing on Survival and Regrowth of \u3cem\u3eMiscanthus sinensis\u3c/em\u3e Tillers
Vertical Distribution of Plant Parts and the Selectivity of Harvesting Heights by Cattle in \u3cem\u3eMiscanthus sinensis\u3c/em\u3e
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