Managing Fatigue at the Workplace...

Managing Fatigue at the Workplace Fatigue is a physical and/or mental state caused by overexertion. It is an acute, ongoing state of tiredness that leads to mental or physical exhaustion and prevents people from functioning within normal boundaries. It is more than feeling tired and drowsy. It is a physical condition that can occur when a person’s physical or mental limits are reached. Fatigue can be caused by factors which may be work related, non-work related or a combination of both and can accumulate over time. In a work context, fatigue reduces an employee’s ability to perform work safely and effectively. It reduces the employee’s capabilities to an extent that may impair his strength, speed, reaction time, coordination, decision making, or balance. It can occur because of prolonged mental or physical activity, sleep loss and/or disruption of the internal body clock. Fatigue is caused by prolonged periods of physical and/or mental exertion without enough time to rest and recover. It is a catch-all term for a variety of symptoms, ranging from muscle pain to difficulty in concentrating, or sleepiness. It can compromise health and safety at work and is a common outcome of stress and shift-work. Fatigue is defined as ‘the temporary inability, or decrease in ability, or strong disinclination to respond to a situation, because of inadequate recuperation from previous over-activity which can be either mental, or emotional, or physical’. Fatigue can be considered as local or general, acute or chronic. Acute fatigue is the result of sudden and/or severe exposure or onset, while chronic fatigue usually develops after longer exposures, often of a significantly smaller intensity than present in acute fatigue. Chronic fatigue develops slowly. A common symptom of fatigue is an unpleasant, general sensation of weariness. Other outcomes of fatigue include...

Comparison of Steel with Aluminum...

Comparison of Steel with Aluminum Steel is an alloy of iron and other elements, primarily carbon. It is most commonly produced by reduction of iron ore. Carbon, the most common alloying material in steel, acts as a hardening agent, preventing any dislocations within the iron atom crystal lattice from separating and sliding past each other thus making steel more durable. By varying the amount of alloying elements and the form of their presence in the steel, one can control qualities such as hardness, ductility, and tensile strength of steel. Though, steel has been known to be around since 4,000 years ago, it was not widely produced until the 17th century. Its mass production started due to the introduction of the Bessemer process during 1850s. This process made steel production cheaper, efficient and easier. Production of steel is a two stage process. First iron is produced by reduction of iron ore. This iron is then converted into steel by oxidizing the impurities. (Fig 1) Fig 1 Production process of steel Steel is widely used in construction and other applications because of its high tensile strength and low cost. Iron is the basic component of steel. Composition of steel mainly consists of iron and other elements such as carbon, manganese, silicon, phosphorus, sulphur, and alloying elements. A large number of elements in wide ranging percentages are used for the purpose of alloying of steels. Variations in chemical composition of steels are responsible for a great variety of steel grades and steel properties. Each element that is added to the basic steel composition has some effect on the properties of the steel and how that steel reacts to the processes of working and fabrication of steels. The chemical composition of steel also determines the behaviour of steel in...