The Prime Power Conjecture (PPC) states that abelian planar diierence sets of order n exist only for n a prime power. Evans and Mann 2] veriied this for cyclic diierence sets for n 1600. In this paper we verify the PPC for n 2;000;000, using many necessary conditions on the group of multipliers.

BACKGROUND Trauma is one of the leading causes of death in the Mthatha area, which is one of the least developed regions of South Africa. Road traffic accidents (RTAs) contribute substantially to the number of such deaths. OBJECTIVE To estimate the number of fatal RTAs in the Mthatha area, and analyse age and sex of the deceased. METHODS A review of autopsies performed in the Mthatha Genera...

Personal protective equipment (PPE) is a tool that must be used when working according to work hazards and risks maintain the safety of workers themselves those around them. PPE plays an important role in occupational health. The purpose this study was determine relationship between knowledge, attitudes, availability, regulations, worker’s supervision compliance with use on at PT.Wijaya Karya B...

A stable flow structure in a fully turbulent von Kármán swirling with counter-rotating disks is examined experimentally using global characterization methods (particle image velocimetry and ultrasonic profiling) local at the center (ultrasonic Lagrangian tracking). The exhibits an azimuthal modulation central transverse plane, rotating slowly direction. Contrary to previous studies, bifurcation...

Thyroid cancer is the most common of the endocrine malignancies and it represents <1% of all human tumors. The annual incidence of thyroid cancer varies considerably by geographic area, age and sex. A recent review reported an overall incidence of all types of thyroid cancer in the USA of 7.7 per 100 000 person-years, with rates of 11.3 per 100 000 woman-years and 4.1 per 100 000 man-years [1]....

PURPOSE The purpose of this study was to test the effects of infant massage (auditory (mother's voice), tactile/kinesthetic (massage) and visual (eye to eye contact) stimulation) on weight and height of infant and mother-infant interaction with normal infants over a period of 4 weeks. METHOD This study was designed as a nonequivalent control group pretest-posttest design. The experimental gro...

BACKGROUND The British merchant fleet has expanded in recent years but it is not known whether this expansion has led to proportionate changes in mortality. AIMS To investigate mortality from accidents and injuries in British merchant shipping, to determine whether this has increased in recent years, to compare fatal accident rates across British industries and to review fatal accident rates ...