advancesindifferenceequations.com/content/2013/1/57 RESEARCH Open Access Global dynamics in a class of discrete-time epidemic models with disease courses Lei Wang‚ Qianqian Cui and Zhidong Teng* * Correspondence: zhidong@xju.edu.cn College of Mathematics and System Sciences‚ Xinjiang University‚ Urumqi‚ Xinjiang 830046‚ P.R. China Abstract In this paper‚ a class of discrete SIRS epidemic models with disease courses is studied. The basic reproduction number R0 is computed. The
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Global warming refers to an unequivocal and continuing rise in the average temperature of Earth’s climate system.[2] Since 1971‚ 90% of the warming has occurred in the oceans.[3] Despite the oceans’ dominant role in energy storage‚ the term "global warming" is also used to refer to increases in average temperature of the air and sea at Earth’s surface.[4][5] Since the early 20th century‚ the global air and sea surface temperature has increased about 0.8 °C (1.4 °F)‚ with about two-thirds of the increase
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We can’t stop pollution now Pollution has been haunting us in recent years during which we have gradually become accustomed to sand storms but then we are being challenged by smog. We begin to complain about the rapid economic growth‚ the governmental dereliction of duty and decline of citizens’ quality. To some extent‚ we sometimes tend to believe that only if the government and citizens work hand in hand to curb environmental pollution‚ the problem can disappear. However‚ this is not the case
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Global Marketing Assignment Individual Q1 Assess the market opportunities and threats for the sport-shoe manufacturer‚ Asics which is planning to enter the ASEAN market? Ascis today is the forefront business and world wide performance in sports market industry and its currently the leading the running shoe brand athletes. The choice for providing comfort‚support‚ and supirior rides. Ascis has made further developments in its products for both men and women.It has also reached the core
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Collaboration Global competition‚ rapid changes in technology and a shift in demographics has resulted in fewer people doing more work as organizations outsource‚ downsize‚ reengineer or restructure to remain competitive. In the article‚ The Collaborative Workplace‚ Edward Marshall states that these structural changes have lead to increased instability‚ fear and reduce productivity. With fewer employees‚ organizations are rethinking how they lead and manage the workplace. One solution is to
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Disadvantage: Cost * While newspaper advertising is cost-efficient‚ magazine advertising can be costly depending on the popularity of the magazine‚ its history‚ readership‚ frequency and production costs. Smaller publications that are unable to garner the attention of large brands may offer lower advertising rates. Since print advertising prices vary‚ companies offer databases which provide businesses with advertising rates‚ contact information and advertising schedules for major and niche print
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effects to create a lasting impact. Marketers interact color‚ sound‚ sight‚ drama and motion to ensure that their message is strong and persuasive. Additional tactics and props‚ such as attractive models‚ elaborative sets‚ enchanting graphics and audio-visual effects further enhance impact. Disadvantages Intrusive: Consumers often bemoan the intrusive nature of television advertisements and find ways to avoid commercials. This limits the effectiveness of television advertising. Consumers either take
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Global warming Global warming is the increase in the average measured temperature of the Earth ’s near-surface air and oceans since the mid-20th century‚ and its projected continuation. The average global air temperature near the Earth ’s surface increased 0.74 ± 0.18 °C (1.33 ± 0.32 °F) during the 100 years ending in 2005.[1] The Intergovernmental Panel on Climate Change (IPCC) concludes "most of the observed increase in globally averaged temperatures since the mid-twentieth century is very
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Possible solutions to energy crisis Submitted by Vijayalaxmi Baligar Table of contents: 1. Introduction and overview. 2. Consumption of energy in India 2a. Consumption of electrical energy and reducing the power loss in transmission lines. 2b. Energy Consumption in service sectors and in industrial sectors 2c. Energy consumption in the Agriculture Sector 3. Recycling. 3a. Role of recycling in energy
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of people to keep in touch with each other although they are a million of miles away‚ even stresses out overseas. Although humanity has benefited from the resources and convenience provided by telecommunication‚ contradicting these are the disadvantages of telecommunication if misused‚ brutalized and abused. ”Communication ties together the parts of the society just as the nervous system ties together the parts of an individual. From earliest times‚ when the only form of communication was speech
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