We bound the diameter of a distance-regular graph in which two subdegrees are equal.

A point set is separated if the minimum distance between its elements is 1. We call two real numbers nearly equal if they differ by at most 1. We prove that for any dimension d ≥ 2 and any γ > 0, if P is a separated set of n points in Rd such that at least γ n2 pairs in ( P 2 ) determine nearly equal distances, then the diameter of P is at least C(d, γ )n2/(d−1) for some constant C(d, γ ) > 0. ...

A graph G is diameter-2-critical if its diameter is two and the deletion of any edge increases the diameter. In this paper we characterize the diameter-2-critical graphs with no antihole of length four, that is, the diameter-2-critical graphs whose complements have no induced 4-cycle. Murty and Simon conjectured that the number of edges in a diameter-2-critical graph of order n is at most n2/4 ...

ype of the pelvis. World wide the female pelvis Tdivided into four types :The anthropoid pelvis [dolicpellic]with long oval pelvic brim the anteroposterior diameter exeeds the transverse diameter. The gynaecoid pelvis [mesatipellic] with rounded pelvic brim the antero-posterior and transverse diameters are of equal length or the former exceeds the latter by not more than 1cm. The andoroid [brac...

a brass vortex tube (vt) with interchangeable parts is used to determine the optimum cold end orifice diameter, main tube length and diameter. experiments were carried out to study the effects of operating pressure as well. it is shown that there is an optimum value for cold end orifice diameter, which is equal to 4mm and there is an optimum value for cold and hot exit temperature difference at...

In 1862 Dr. Herman Snellen, professor of ophthalmology in the University of Utrecht, Holland, and director of the Netherlands Institute for Diseases of the Eye, published an improved series of test types for measuring the acuity of vision. The principle which guided him in the construction of these test letters is based upon the fact that the normal eye can just discern objects that subtend a o...

OBJECTIVE We evaluated the influence of the diameter and the preparation of the pilot hole on the resistance to the pulling out and the strength when inserting pedicle screws with conical internal diameter. METHODS Mechanical experiments were performed with pedicle conical screws of 4.2 mm and 5.2 mm diameter. They were inserted in the vertebral pedicles of swine. The hole was manufactured wi...

The diameters of pial arteries and veins were continuously monitored by a multichannel videoangiometer through a closed cranial window in 13 cats. Seventy-two arterial portions (diameter 30-283 micrometer) and 103 venous segments (diameter 32-486 micrometer) were studied under resting conditions and during stimulation of the cervical sympathetic chain. Arteries with a diameter of less than or e...

9 In this paper, the influence of aggregate size and volume fraction on shrinkage induced micro-cracking and 10 permeability of concrete and mortar was investigated. Nonlinear finite element analyses of model concrete 11 and mortar specimens with regular and random aggregate arrangements were performed. The aggregate 12 diameter was varied between 2 and 16 mm. Furthermore, a range of volume fra...