A proper protection system guarantees reliable and safe operation for a geothermal power plant. It is one of the most important factors during system engineering design and must be carefully selected to avoid equipment damage due to failures. The process design should include the selection of a protection scheme as well as adequate main and auxiliary equipment and installation considerations. A...

The new European Norms EN 60555 and the international standard IEC555 will impose a limit on the harmonic content of the input current of mains supplied equipment. In practice this will require the addition of a Power Factor Corrector (PFC) at the input of many types of mains operated electronic equipment, for example electronic lamp ballasts, TV power supplies and motor drives. A correctly des...

A description is given of settling chambers with sprays, cyclone types and electrostatic precipitators as used in municipal incinerators. Special emphasis is placed on selection and duct design especially to inlets of collectors which affects efficiency. Importance is stressed on preventing leaks and overfilling of hoppers and proper maintenance of equipment in order to obtain optimum efficienc...

Increasing concerns about radiation dose have led CT manufacturers to further develop radiation dose reduction tools in the latest generation of CT scanners. These tools include automated tube current modulation, automated tube potential selection, and iterative reconstruction. This review details the principles underlying each of these 3 dose reduction utilities and their different permutation...

An aperiodic test clock methodology to reduce test time of wafer sort has been recently proposed. In practice, however, an automatic test equipment (ATE) allows only a small number of clock periods and finding those is a mathematically complex problem. This paper proposes an algorithm for optimal selection of any given number of tester clock periods. Keywords-Aperiodic clock, Test time reductio...

The perioperative nurse involved in the intraoperative care of the obese patient is faced with numerous issues and challenges. As a growing number of these patients present for medical care, the nurse must consider the special positioning needs for surgery and the equipment needed to promote the safest environment for the patient. This article addresses positioning considerations for the obese ...

According to WHO, at any one time, around 50 per cent of medical equipment in lowand middle-income countries cannot be used because of lack of maintenance or spare parts.1 We have found that unwillingness or inability to repair equipment and put it back in use is also a major cause. New equipment is made available by different international non-government organisations (INGOs) competing with on...

When using electrical equipment in installations operating hazardous areas endangered by potentially explosive atmospheres, care shall be taken also to the selection of such equipment. The correct for use atmospheres must considered design phase an installation and verified mounting phase. Equipment intended designed, manufactured placed on EU market considering provisions ATEX Directive 2014/3...

Scrapers are advantageous earthmoving construction equipments as they are independently capable of excavating, hauling, and placing soil. Determining the suitable and the most economical selection of the size, model, and number of scrapers and pushers is a complex process that depends on multiple factors such as the haul-road conditions, equipment performance, operation’s travel time, etc. Equi...