Willa Cather's 1913 novel, O Pioneers! concludes with an unexpected moment of extreme violence as two young lovers, Emil Bergson and Marie Shabata, are murdered by Marie's husband in a mulberry orchard. Cather's novel is almost wholly devoted to the psychological interior of the protagonist, Alexandra Bergson, thereby rendering this violent interruption more dynamic as it essentially undercuts ...

We associate to certain symmetric or antisymmetric functions on the set ( E d+1 ) of (d+ 1)−subsets in a finite set E an equivalence relation on E and study some of its properties. 1 Definitions and main results We consider a finite set E and denote by (E d ) the set of subsets containing exactly d elements of E. In the sequel we move often freely from sets to sequences: we identify a subset {x...

15. Dillon JC, Weyman AE, Feigenbaum H, Eggleton RC, Johnston K: Cross-sectional echocardiographic examination of the interatrial septum. Circulation 55: 115, 1977 16. Lieppe W, Scallion R, Behar VS, Kisslo JA: Two-dimensional echocardiographic findings in atrial septal defect. Circulation 56: 447, 1977 17. Hagler DJ, Tajik AJ, Seward JB, Mair DD, Ritter DG: Realtime wide-angle sector echocardi...

Let P be a set of n points in the plane, not all on a line. We show that if n is large then there are at least n/2 ordinary lines, that is to say lines passing through exactly two points of P . This confirms, for large n, a conjecture of Dirac and Motzkin. In fact we describe the exact extremisers for this problem, as well as all sets having fewer than n−C ordinary lines for some absolute const...

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The measurement and control of soil moisture are the key technologies of precision agriculture. In order to real-time detect soil moisture content faster and more accurately, a portable soil moisture sensor based on NIR spectroscopy was developed. With the sixty soil samples collected from a winter jujube orchard, a linear regression model was established. The determination coefficients of the ...

Accurate pre-harvest estimation of avocado (Persea americana cv. Haas) yield offers a range of benefits to industry and growers. Currently there is no commercial yield monitor available for avocado tree crops and the manual count method used for yield forecasting can be highly inaccurate. Remote sensing using satellite imagery offers a potential means to achieve accurate pre-harvest yield forec...