Excited states in the full QCD hadron spectrum on a 163×4016^3 \times 40 lattice

We report the hadron mass spectrum obtained on a $16^3 \times 40$ lattice at $\beta = 5.7$ using two flavors of staggered fermions with $m a = 0.01$. We calculate the masses of excited states that have the same quantum numbers as the $\pi$, $\rho$ and $N$. They are obtained by a combined analysis of the hadron correlators from sources of size $16^3$ and $8^3$. We also report on the hadron spectrum for a wide range of valence quark masses.Comment: Contribution to Lattice 95. 4 pages. Compressed, uuencoded postscript file. Send questions to [email protected]

Some sufficient conditions for infinite collisions of simple random walks on a wedge comb

In this paper, we give some sufficient conditions for the infinite collisions of independent simple random walks on a wedge comb with profile \{f(n), n\in \ZZ\}. One interesting result is that if $f(n)$ has a growth order as $n\log n$, then two independent simple random walks on the wedge comb will collide infinitely many times. Another is that if \{f(n); n\in \ZZ\} are given by i.i.d. non-negative random variables with finite mean, then for almost all wedge comb with such profile, three independent simple random walks on it will collide infinitely many times

Hadron masses on a 16^3 x 40 lattice at \beta = 5.7

We report on the hadron mass spectrum obtained on a 16^3 x 40 lattice in full QCD at \beta = 5.7 using two flavors of staggered fermions with m a = 0.01. We study the effective mass plateaus for different sized sources. Our mass results are slightly lighter than our earlier 16^3 x 32 calculation. The Landau gauge \Delta is quite different from the Coulomb gauge \Delta.Comment: Contribution to Lattice 94. 3 pages. Latex source followed by compressed, uuenocded postscript file of the complete paper. Individual figures available from [email protected]

On the ratchet analysis of a cracked welded pipe

This paper presents the ratchet limit analysis of a pipe with a symmetric crack in a mismatched weld by using the extended Linear Matching Method (LMM). Two loading conditions are considered: i) a cyclic temperature load and a constant internal pressure; and ii) a cyclic temperature load and a constant axial tension. Individual effects of i) the geometry of the Weld Metal (WM), ii) the size of the crack, iii) the location of the crack and iv) the yield stress of WM on the ratchet limits, maximum temperature ranges to avoid ratchetting and limit loads are investigated. Influence functions of the yield stress of WM on the maximum temperature ranges and limit loads are generated. The results confirm the applicability of the extended LMM to the cracked welded pipe