One of the important parameters in undercut slopes design is the determination of the maximum stable undercut span. The maximum stable undercut span is a function of slope geometry, the strength parameters of the slope material, condition of discontinuities, underground water condition, etc. However, the desired production capacity and therefore the size of excavating equipment will sometimes a...

The modern society has come to expect the electrical energy on demand, while many of the facilities in power systems are aging beyond repair and maintenance. The risk of failure is increasing with the aging equipments and can pose serious consequences for continuity of electricity supply. As the equipments used in high voltage power networks are very expensive, economically it may not be feasib...

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...

Reliability is an important consideration in the planning, design and operation of engineeringsystems. As the size and complexity of mining equipment continue to increase, the implica-tions of equipment failure become ever more critical. One method to mitigate the impact offailures is to improve the reliability of the equipment. One of the purposes of system reliabil-ity analysi...

Technical diagnosis is often confronted with machines that still work but should possibly be repaired to increase eeciency or to avoid general failure. Post-mortem repair strategies are usually too late and tend to increase costs. Prophylactic maintenance of machinery at regular intervals does not lead to unexpected breakdowns but is equally costly. The best strategy would be repairing or repla...

electric power industry have always try to provide reliable electricity to customers and at the same time decrease system costs. high voltage circuit-breakers are an essential part of the power network. this study has developed a maintenance and replacement scheduling model for high voltage circuit- breakers that minimize maintenance costs while maintaining the acceptable reliability. this mode...