One is a small, portable printing calculator and the other is a hand-held version without a printer. Both versions feature a "smart" magnetic card reader, and each can run the other's programs. TWO POWERFUL NEW fully programmable per sonal calculators in the tradition of the HP-65 (the first fully programmable pocket-sized scientific calculator)1 are the pocket-sized HP-67, Fig. 1, and the HP-9...

In this paper we propose a Logic Calculator with three operation modes: evaluation of logical formulae; logical entailment and conversion of a formula to Disjunctive Normal Form (DNF) and Conjunctive Normal Form (CNF). It is worth noting there are no existing automated tools for these three computations integrated into one tool providing a graphical calculator format. Logic Calculator is availa...

This paper describes the recent development of hand-held algebraic calculators and evaluates their significance for secondary education. Sophisticated computer algebra systems (CAS) have been available to mathematicians for some years now but have been too powerful, too sophisticated and too expensive and have required too much access to powerful computers to have had much impact on teaching an...

An investigation of a deep electrolytic tank, applied as a lifting-surface calculator, has been made. The reasons for the initial choice of apparatus, and its subsequent behaviour are .detailed. The calculator was developed for use with the investigation of plane surfaces, plane control surfaces and a symmetrically cambered wing. The results have been compared with existing theoretical and expe...

BACKGROUND Despite growing number of intraocular lens power calculation formulas, there is no evidence that these formulas have good predictive accuracy in pediatric, whose eyes are still undergoing rapid growth and refractive changes. This study is intended to compare the prediction error and the accuracy of predictability of intraocular lens power calculation in pediatric patients at 3 month ...

PURPOSE Hip fractures are associated with poor prognosis in elderly patients partly due to the high rate of postoperative complications. This study was aimed to investigate whether the surgical risk calculator is suitable for predicting postoperative complications in elderly Chinese patients with hip fractures. METHODS The incidence of postoperative complications among 410 elderly patients wi...