Chapter 4 The Enhanced E-R Model and Business Rules Chapter Objectives The purpose of this chapter is to present some important extensions to the E-R model (described in Chapter 3) that are useful in capturing additional business meaning. In particular we describe two types of extensions to the E-R model. The enhanced entity-relationship (EER) model includes constructs for supertype/subtype relationships. The inclusion of new notation for business rules allows the designer to capture
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physical causes are‚ the monsoon climate brings very heavy rain and snow‚ and soils are leached and heavy runoff results in soil erosion‚ snow melting results in soil erosion and a rapid increase in river discharge. Moreover some more reasons are because deforestation in head water areas due to increasing population in Nepal and Tibet. Trees cleared for fuel and grazing land ‚ less evaporation more runoff and faster soil corrosion‚ Rivers silt up due to increased soil erosion. This raises the river bed
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occurs when rain water runoff from urban and industrial areas and from agricultural land and mining operations makes its way back to receiving waters (river‚ lake or ocean) and into the ground. STORMWATER Stormwater is a point source that contributes to water pollution. Because impervious surfaces (parking lots‚ roads‚ buildings‚ compacted soil) do not allow rain to infiltrate into the ground‚ more runoff is generated than in the undeveloped condition. This additional runoff can erode watercourses
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The journal article “Examining Sex Differences in Altering Attitudes about Rape: A Test of the Elaboration Likelihood Model” details a study that uses the Elaboration Likelihood Model to examine how attitudes toward rape change and which route‚ central or peripheral‚ was more compelling. The researchers clearly state their six hypotheses that focused on the differences in beliefs between men and women during a pretest‚ posttest‚ and follow-up assessment regarding rape and sexual assault. This study
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Homework – 24/05/11 Write about what is a positive role model in children and young peoples work force and all about you and your job role. 400 words 100 words evaluation Include your qualities skills & workplace policies and procedures. Write About What Is A Positive Role Model In Children And Young Peoples Workforce And All About You And Your Job Role. Role Models And Why They Should Be Positive. One way in which children learn is by watching and copying others. “Children
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and OSI Reference Model First we discuss‚ what is TCP\IP and OSI model‚ why they are introduced and where they are used. In the following Section OSI Reference models explained with all layers as well as their responsibilities. Open Systems Interconnection model (OSI model): OSI reference model is now considered as a primary standard for internetworking and inter computing. Today many network communication protocols are based on the standards of OSI model. In the OSI model the network/data communication
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Worden’s four task model marked a transition from the fixed‚ passive stage theory proposed by Kübler-Ross‚ to a more active model entailing a number of tasks that must be undertaken when coping with the loss of an individual specifically through death. Individuals are viewed as active participants in the grieving process (Worden‚ 1991). Furthermore‚ his task model integrates a lot from earlier theorists such as Bowlby and in particular Freud’s concept of grief work. Worden (2010) conceptualised
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Trees filter sewage and farm chemicals‚ reduce the effects of animal wastes‚ clean roadside spills and clean water runoff into streams. 3. Trees Control Noise Pollution Trees muffle urban noise almost as effectively as stone walls. Trees‚ planted at strategic points in a neighborhood or around your house‚ can abate major noises from freeways and airports. 4. Trees Slow Storm Water Runoff Flash flooding can be dramatically reduced by a forest or by planting trees. One Colorado blue spruce‚ either
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While the nature takes from 100 to 400 years to build one centimetre of top soil‚ man can and often does destroy it almost overnight by haphazard land use and improvident husbandry. Irrational methods of cultivation‚ deforestation‚ destruction of natural vegetation due to overgrazing by pasturing animals etc.‚ accelerate denudation. Besides‚ failure of rains‚ floods‚ depopulation and loss of cattle caused by famine and pestilence‚ disturbance caused by war and interference with or change
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Have you ever had the flu? If you have you know all the symptoms like headaches‚ sore throat‚ dizziness‚ and vomiting. The symptoms are miserable! What if one day you decided to take a nice swim in Lake Erie‚ and a couple hours after swimming these symptoms started occurring? Im sure you would not be happy! In the article “See Striking New Images of Algae Blooms in the Great Lakes” by Mia Tramz (Time Magazine) said‚ “Lake Erie is In danger of dying by suffocation‚ said‚and only we can stop it.”
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