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As a first step in developing a fundamental understanding of the cavitation erosion process on polymer surfaces, simulations are performed of the collapse of individual bubbles against a compliant surface e.g. metallic substrates with polyurea coatings. The surface response of collapse-driven impact loads is represented by a idealized, time-dependent, Gaussian pressure distribution on the surface. A two-dimensional distribution of load radii and durations is considered corresponding to characteristic of cavitating flows accelerated erosion experiments. Finite element simulations are performed to fit a response curve that relates the loading parameters to the energy dissipated in the coating and integrated with collapse statistics to generate an expected heat input into the coating.
The impulsive pressure, which is generated due to bubble collapse, impacts the material and generates intense shock waves. The stress waves within the material reflects by interaction with the substrate. A transient region of high tensile stress is produced by the interaction of these waves. Simulations suggests that maximum hydrostatic tension which cause failure of polyurea layer is observed in thick coating. Also, the dissipated viscous energy and corresponding temperature rise in a polyurea is calculated, and it is concluded that temperature has influence on deformation.
Although there have been many attempts to adapt EIP methodology to existing industrial sharing networks, most of them have failed for various factors: geographic restrictions by governmental organizations on use of technology, cost of technology, the inability of industries to effectively communicate their upstream and downstream resource usage, and to diminishing natural resources such as water, land and non-renewable energy (NRE) sources for energy production.
This paper presents a feasibility study conducted to evaluate the comparative environmental, economic, and geographic impacts arising from the use of renewable energy (RE) and NRE to power EIPs. Life Cycle Assessment (LCA) methodology, which is used in a variety of sectors to evaluate the environmental merits and demerits of different kinds of products and processes, was employed for comparison between these two energy production methods based on factors such as greenhouse gas emission, acidification potential, eutrophication potential, human toxicity potential, fresh water usage and land usage. To complement the environmental LCA analysis, levelized cost of electricity was used to evaluate the economic impact. This model was analyzed for two different geographic locations; United States and Europe, for 12 different energy production technologies.
The outcome of this study points out the environmental, economic and geographic superiority of one energy source over the other, including the total carbon dioxide equivalent emissions, which can then be related to the total number of carbon credits that can be earned or used to mitigate the overall carbon emission and move closer towards a net zero carbon footprint goal thus making the EIPs truly sustainable.
Abstract<br/>Foreign Direct Investment has been pursued to economically integrate countries and to increase economic development. This has been accomplished partly through the WTO and Free Trade Agreements (FTAs), which have spurred foreign direct investment (FDI) by removing barriers to trade tariff and nontariff. In addition, they also created a framework and legal guidelines and regulations for investment and trade. Research suggests that this is the case when looking at country level data before and after FTAs go into effect. Although the existing literature offers important insights a weakness is it does not often look at the relationship between FTAs and FDI by analyzing firm level data. This is an important relationship to be studied as, beyond governments multinational companies (MNCs) are one of few key actors that can benefit the most and have the capabilities to take advantage of these FTAs. Therefore, studying the relationship between MNCs and their investments both before and after an FTA is signed is important to see if FDI would change in response to Free Trade Agreements and have an impact at the MNC level deployment of FDI. This would be significant to see if the current steady for attracting FDI is working. This is also important as FDI helps countries develop. Therefore, it can be seen as an exceptional contribution to the overall research on the subject. In this paper I will explore how companies have reacted to the formation of FTAs as well as the distinct effects of North-South South-South and North-North Agreements on firm’s investment strategies, using firm level data and drawing on interviews with multiple trade officials.
The United States and the Soviet Union faced off in Europe, but what did the spread of their influence look like around the globe? This is answered through researching the economic and political nuances of the Cold War.