29,376 research outputs found
A series of thirteen original radio programs on music appreciation for students in grades five, six, and seven designed for in-school listening
Thesis (M.S.)--Boston Universit
On the unlikelihood of specific long range forces in immunologic and enzymatic reactions
In the past few years, a great many experiments have been performed by Rothen (24, 25) which he has interpreted as suggesting that antigen and antibody, and enzyme and substrate proteins, can react specifically, although separated by distances of hundreds of angstroms. This hypothesis seems to conflict with evidence accumulated from many other investigations indicating that short range interactions, involving distances usually associated with electrostatic and van der Waals’ forces, and hydrogen bonds, of the order of 5 A, operate in these reactions. We have therefore engaged in a critical analysis of the experimental techniques used by Rothen to determine whether some interpretation other than that invoking the existence of specific long range forces could be found to explain his experimental results
Laser probing of the atmosphere Semiannual status report
Light backscattering experiment in laser probing studies of atmospheric layer above 100 k
Comments on Ringwood's paper 'Petrogenesis of Apollo 11 basalts and implications for lunar origin'
Apollo 11 basalt petrogenesis and theories of lunar evolution comparing lunar and earth environment
Long distance contributions in decays
Using the factorization scheme for the nonleptonic weak
amplitudes, we classify all diagrams which arise in decays and
calculate them with the help of the hybrid model which combines the heavy quark
effective theory and the chiral Lagrangian approach. Thus we determine the long
distance contribution to the amplitudes of Cabibbo allowed and Cabibbo
suppressed decays. The calculation of the expected range of the
branching ratios of nine different channels is compared with
results of other approaches. The present work establishes an increase of the
parity violating contribution in these decays in comparison with previous
analyses.Comment: 15 pages, latex, 2 figures; we have changed Table 2 and the caption
of Table 1. To be published in Eur. Phys.
Phobos and Deimos: A base for sampling the Martian past
Future exploration of Mars is summed up by the proposal that the Martian satellites provide an ideal base for exploring the surface of Mars. For example, a manned base on Deimos could direct a series of unmanned rovers and sample recovery operations, providing an immediate feedback to the operation. Samples analyzed in such an environment would be fresh, and most importantly, would not require quarantine
Loop algebras, gauge invariants and a new completely integrable system
One fruitful motivating principle of much research on the family of
integrable systems known as ``Toda lattices'' has been the heuristic assumption
that the periodic Toda lattice in an affine Lie algebra is directly analogous
to the nonperiodic Toda lattice in a finite-dimensional Lie algebra. This paper
shows that the analogy is not perfect. A discrepancy arises because the natural
generalization of the structure theory of finite-dimensional simple Lie
algebras is not the structure theory of loop algebras but the structure theory
of affine Kac-Moody algebras. In this paper we use this natural generalization
to construct the natural analog of the nonperiodic Toda lattice. Surprisingly,
the result is not the periodic Toda lattice but a new completely integrable
system on the periodic Toda lattice phase space. This integrable system is
prescribed purely in terms of Lie-theoretic data. The commuting functions are
precisely the gauge-invariant functions one obtains by viewing elements of the
loop algebra as connections on a bundle over
- …