An experimental investigation on heat transfer coefficient is presented from three horizontal tubes in a vertical array in a duct for 500<ReD<6000. A mass transfer measuring technique based on psychrometry chart is used to determine heat transfer coefficient. The diameter of the tubes is 11 mm each spaced 40 mm apart and in-line pitch ratio varies in the range 0.055<D/W<0.22. The experimenta...

Genetic differences in natural vs hormone-induced ovulation rates were compared in immature female mice from five lines that had undergone long-term single-trait and antagonistic index selection for litter size and(or) 6-wk BW. Lines used were control (K); high litter size (L+); high BW (W+); low litter size and high BW (L-W+); and high litter size and low BW (L+W-). Natural ovulation rate at a...

In a metric space with distance function dist, we say that v is between u and w if u,v,w are pairwise distinct dist(u,w)=dist(u,v)+dist(v,w). All triples {u,v,w} such constitute hypergraph induced by this space. answer to question posed in [3], construct an infinite family of 3-uniform hypergraphs no The line determined pair points x y the set consisting x, y, all z one x,y,z remaining two. Two...

We present some characterizations for the wrapped butterfly, a class of useful network models in parallel processing. Our characterizations are parallel to the characterization of Bermond et al. for the (ordinary) butterfly. But our approach seems more natural and provides some more insight. In the course of our study, we also give a slight improvement of a result of Beineke et al. which charac...

For a positive integer k, let k + k denote the poset consisting of two disjoint k-element chains, with all points of one chain incomparable with all points of the other. Bosek, Krawczyk and Szczypka showed that for each k ≥ 1, there exists a constant ck so that First Fit will use at most ckw 2 chains in partitioning a poset P of width at most w, provided the poset excludes k+k as a subposet. Th...

One of the problems of existing irrigation networks is seepage phenomena. Seepage problem and its control in irrigation channels is one of the most important issues in the design, construction, maintenance and operation of these channels. In this study, simulated the rate of seepage and phreatic lines in the Mianab irrigation and drainage channels located in the Karun basin using mathematical t...

Beineke and Robertson independently characterized line graphs in terms of nine forbidden induced subgraphs. In 1994, S8 olte s gave another characterization, which reduces the number of forbidden induced subgraphs to seven, with only five exceptional cases. A graph is said to be a dumbbell if it consists of two complete graphs sharing exactly one common edge. In this paper, we show that a graph...

Consider the standard setting where we are given n points in d dimensions. Call these ~ x1, ~ x2, . . . , ~ xn. As before, our goal is to reduce the number of dimensions to a small number k. In principal component analysis (or PCA), we will model the data by a k-dimensional subspace, and find the subspace for which the error in this representation is smallest. Suppose k = 1. Then we want to app...

Windowing queries answer important questions. Primarily, windowing queries answer information involving a given line segment and a windowing region. Given a set of n line segments S and a query window W := [x : x ]x[y : y ], windowing queries answer which segments in S intersect W. The primary difference between windowing queries and range queries is the data. While range queries are associated...

The double zeta function is a function of two arguments defined by a double Dirichlet series, and was first studied by Euler in response to a letter from Goldbach in 1742. By calculating many examples, Euler inferred a closed form evaluation of the double zeta function in terms of values of the Riemann zeta function, in the case when the two arguments are positive integers with opposite parity....