Lighting maintenance

Lighting, maintenance and storage should be considered during the placement process to make sure the sign can be clearly illuminated. 

LRFD Guide Specifications for Design of Pedestrian Bridges, 2nd ed. 2004. Addresses the design and construction of bridges designed primarily for pedestrians, bicyclists, equestrian riders, and light maintenance vehicles. 

Areas in workshops and machinery buildings where communication is required Workshops for light maintenance 70... 

Ultraviolet (uv) light has also been used to stetili2e the water in aquaculture systems. The effectiveness of uv decreases with the thickness of the water column being treated, so the water is usually flowed past uv lights as a thin film (alternatively, the water may flow through a tube a few cm in diameter that is surrounded by uv lights). Uv systems require more routine maintenance than o2one systems. Uv bulbs lose their power with time and need... 

Eig. 8. Cost of electricity (COE) comparison where represents capital charges, Hoperation and maintenance charges, and D fuel charges for the reference cycles. A, steam, light water reactor (LWR), uranium B, steam, conventional furnace, scmbber coal C, gas turbine combined cycle, semiclean hquid D, gas turbine, semiclean Hquid, and advanced cycles E, steam atmospheric fluidized bed, coal E, gas turbine (water-cooled) combined low heating value (LHV) gas G, open cycle MHD coal H, steam, pressurized fluidized bed, coal I, closed cycle helium gas turbine, atmospheric fluidized bed (AEB), coal J, metal vapor topping cycle, pressurized fluidized bed (PEB), coal K, gas turbine (water-cooled) combined, semiclean Hquid L, gas turbine... 

Follow- Up. Even after the system is deHvered, additional work is usually needed. In conventional software engineering this is viewed as software maintenance or upgrade. It is referred to here as foUow-up to emphasize that the process of knowledge-base refinement that begias ia the prototypiag stage can continue even after the system is commissioned. The need for additional detail may come to light only after the appHcation has been ia use for some period of time. The time required to implement such enhancements should be takea iato accouat. 

The use of a squirrel cage motor is, however, inevitable as discussed earlier particularly for a process plant or a power house application, where downtime for maintenance of a slip-ring motor is unwelcome, or a chemical plant or contaminated locations, where the application of a slipring motor is prohibitive. To meet such load requirements with a squirrel cage motor, the use of fluid couplings to start the motor lightly and reduce starting time, is quite common and economical, as discussed in Chapter 8, and must be adopted in the above case. 

On slow-speed equipment, where the hub does not have to be removed for maintenance and integral hubs are not available from the supplier, a straight fit can be used with a reasonably heavy shrink—1.25 mil/ in. of diameter. Tolerances may allow this value to vary from 1.0 to 1.5 mil/in. of diameter however, 1.0 mil/in. may be loo loose for some applications, while 1.5 mil/in. over-stresses hubs at maximum bore sizes. In light of this, each application should be carefully evaluated if there is no experience at hand to use as a guide. Of course, field removal at the higher shrink fit is mnrv difficult. Keys should not be used. 

Plastics also find increasing use in vehicles for both water and air transport. Glass-fibre-reinforced plastic boats are widely used as a result of their economy in manufacture, ease of maintenance, lightness of weight and, for military purposes, antimagnetic characteristics. The non-corrosive nature of plastics also leads to their widespread use in boat fixtures and fittings. In aircraft, plastics are particularly useful on account of their low density. 

General conditions of work, e.g. maintenance of adequate general ventilation, local exhaust ventilation, access, lighting, fire precautions, occupational health measures, housekeeping. 

Vision is vital for human activities, and eyes are very sensitive to a number of toxic insults induced by chemical compounds. The most serious outcome is permanent eye damage which may be so severe as to cause loss of vision. The eye consists of the cornea and conjunctiva, the choroid, the iris, and the ciliary body. It also contains the retina, which is of neural origin, and the optic nerve. The retina contains photoreceptors, a highly specific light-sensitive type of neural tissue. The eye also contains the lens and a small cerebrospinal fluid system, the aqueous humor system, that is important for the maintenance of the steady state of hydration of the lens and thus the transparency of the eye. 

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