The influence of voltage and current harmonics on equipment connected to electrical supply systems can cause serious problems. This paper presents a synopsis of the problem. The equipment most sensitive to harmonics is considered, such as -asynchronous motors, synchronous machines, transformers, capacitors, ripple control receivers, electricity meters, radio receivers, TV-sets, electronic contr...

The paper proposes a building equipment communications network based on a federation of existing standards and communications protocols. The proposed network concept provides a viable model for control manufacturers to provide advanced digital control of most building equipment. Keywordsbuilding equipment; lighting controls; networking; BACnet; IEEE P1451; IBECS; DALI; building controls; commun...

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...

Despite infection control measures, breakthrough transmission of severe acute respiratory syndrome (SARS) occurred for many hospital workers in Hong Kong. We conducted a case-control study of 72 hospital workers with SARS and 144 matched controls. Inconsistent use of goggles, gowns, gloves, and caps was associated with a higher risk for SARS infection (unadjusted odds ratio 2.42 to 20.54, p < 0...

The continuously increasing complexity of fabricating microelectronics devices has made it necessary to consider utilizing feedback control during plasma processing steps. To investigate and optimally select control strategies, comprehensive plasma equipment models are required. This paper describes a versatile simulation tool, the Virtual Plasma Equipment Model (VPEM), that has been developed ...

Although many conceptual structures for shop ¯oor control have been proposed, their implementation methodologies have not been satisfactorily achieved yet due to the cost and time required for developing new control software and modifying the existing software. This paper suggests a Petri-net-based tool to rapidly develop a task execution module in the equipment controller for distributed shop ...

We compared the efficacy of three physical conditioning programmes provided over a 12 week period (24 h in total) on selected anthropometric and physical fitness parameters in female soccer players. Two of the groups received physical conditioning training in accordance with speed, agility and quickness (SAQ); one group used specialized resistance and speed development SAQ equipment (equipment ...