We prove that Welch Costas arrays are in general not symmetric and that there exist two special families of symmetric Golomb Costas arrays: one is the well-known Lempel family, while the other, although less well known, leads actually to the construction of dense Golomb rulers. © 2008 Elsevier B.V. All rights reserved.

In the midwifery profession, measuring pelvic and cervical dilatation is essential for making decisions, especially when the mother is in labor phase. For this reason, several studies have been conducted in pelvimetry.[1‐4] Measurement of the cervix and judgments about pelvic dimensions are performed by the midwifeʹs fingers. However, as finger size and how to measure the distance between the f...

Background: Despite significantly increased input from multidisciplinary teams during antenatal period, pregnancy outcome from women with type 1, type 2 and gestational diabetes mellitus (DM) remain substantially worse than that of general obstetric population. In Iraq, the true magnitude of infant of diabetic mother (IDM) is not well known as health system has been badly eroded over the period...

A triangle can be specified by giving three independent geometric relationships defined between its elements. Usually, these relationships are distances between two vertices, angles between two sides, and heights. For each triangle specified by a set of three of such relationships, we present a procedure that constructs the triangle using ruler and compass alone. ∗While on leave in Computer Sci...

Most of Iraqi soil is classified as Quaternary deposits, especially in the Mesopotamian plain and tributaries of the River Tigris. Soil varies from north to south of Iraq. These differences in soil affected the process to select the suitable type of foundation. This research is to study the effect of bearing capacity on shallow foundations in different regions of Iraq. Seventy nine samples were...

Pottery art in Iran reached its apex during the Seljuk and Kharazmshahi eras. In these two periods, artists produced high-quality wares,with Minai decorations which were considered as masterpieces of Islamic art from an aesthetical point of view. These wares were decorated with motifs existing in manuscripts illustrated by artists from Baghdad and Seljuk miniature painting schools portraying ep...

General considerations. This disease occurs in the tropical and sub-tropical regions of both the Eastern and Western hemispheres. The exact method of contracting the disease has not yet been definitely settled. Various parasites have been blamed, such as the bed-bug, the mosquito, and several others. Wenyon showed that an "oriental sore" can be experimentally produced by contaminating an abrade...

The physical rules governing the tearing of a packaging or piece paper are not completely elucidated despite being common phenomena in daily life. Here, we investigate how presence straight rigid object, ruler, guides fracture thin sheet within wide range pulling directions. In case isotropic brittle sheets, simple geometrical analysis shows that follows direction vector, which differs signific...