Comparison through energy, exergy and economic analyses of two alternatives for the energy exploitation of vinasse

Energy ◽  
2020 ◽  
Vol 197 ◽  
pp. 117231 ◽  
Author(s):  
Milagros Cecilia Palacios-Bereche ◽  
Reynaldo Palacios-Bereche ◽  
Silvia Azucena Nebra
Keyword(s):  
Economic Analyses ◽  
Two Alternatives ◽  
Energy Exploitation

Economic Analysis of Tank Coatings for Tankers in Clean Service

1965 ◽  
Vol 2 (04) ◽  
pp. 380-389
Author(s):  
E. Lee Purlee ◽  
Walter A. Leyland ◽  
W. E. McPherson
Keyword(s):  
Economic Analysis ◽  
Zinc Silicate ◽  
Silicate Coating ◽  
Economic Analyses ◽  
Two Alternatives

An economic analysis has been made of a hypothetical 30,000-dwt tanker operated in continuous, clean service. Under the premise that the ship will continue to operate throughout her remaining book-life in predominantly clean service, two alternatives are considered. Alternative I: Conventional corrosion policy is continued. Annual shipyard repair, including steel renewals and maintenance are performed to the extent required. Alternative II: The required steel renewals are made at the end of the fifth year of service and all tanks are coated with a zinc silicate coating. Annual shipyard repairs and maintenance are subsequently performed to the extent required. In general, the methods consisted of (a) generating steel-renewal requirements by appropriate simulations for the 20 years' book-life of the vessel, and (b) conducting economic analyses of alternatives I and II for comparison. The results of this study indicate that coating the tanks in accordance with alternative II represents a net saving of $998,301 by the end of the vessel's book-life. The payout time on the coating investment was found to be 6.6 years with an average, annual return on the coating investment of 21.9 percent.

Methods for Restricting Maximum Exposure Rate in Computerized Adaptative Testing

Methodology ◽  
2007 ◽  
Vol 3 (1) ◽  
pp. 14-23 ◽  
Author(s):  
Juan Ramon Barrada ◽  
Julio Olea ◽  
Vicente Ponsoda
Keyword(s):  
Measurement Accuracy ◽  
Computerized Adaptive Testing ◽  
Computation Time ◽  
Adaptive Testing ◽  
Exposure Rate ◽  
Control Parameters ◽  
The Impact ◽  
Two Alternatives ◽  
Selection Of ◽  
Maximum Exposure

Abstract. The Sympson-Hetter (1985) method provides a means of controlling maximum exposure rate of items in Computerized Adaptive Testing. Through a series of simulations, control parameters are set that mark the probability of administration of an item on being selected. This method presents two main problems: it requires a long computation time for calculating the parameters and the maximum exposure rate is slightly above the fixed limit. Van der Linden (2003) presented two alternatives which appear to solve both of the problems. The impact of these methods in the measurement accuracy has not been tested yet. We show how these methods over-restrict the exposure of some highly discriminating items and, thus, the accuracy is decreased. It also shown that, when the desired maximum exposure rate is near the minimum possible value, these methods offer an empirical maximum exposure rate clearly above the goal. A new method, based on the initial estimation of the probability of administration and the probability of selection of the items with the restricted method ( Revuelta & Ponsoda, 1998 ), is presented in this paper. It can be used with the Sympson-Hetter method and with the two van der Linden's methods. This option, when used with Sympson-Hetter, speeds the convergence of the control parameters without decreasing the accuracy.

A comparison of two alternatives for presenting a situational picture

2008 ◽  
Author(s):  
Carin Rencrantz ◽  
Jan Andersson ◽  
Jens Alfredson ◽  
Jenny Lindoff
Keyword(s):  
Two Alternatives

Standards for economic analyses of interventions for the field of health psychology and behavioral medicine.

2019 ◽  
Vol 38 (8) ◽  
pp. 669-671 ◽  
Author(s):  
Dawn K. Wilson ◽  
Alan Christensen ◽  
Paul B. Jacobsen ◽  
Robert M. Kaplan
Keyword(s):  
Health Psychology ◽  
Behavioral Medicine ◽  
Economic Analyses

Ecological Limits and the Meaning of Freedom: A Defense of Liberty as Non-Domination

2017 ◽  
Vol 3 (3) ◽  
pp. 33-49 ◽  
Author(s):  
Augustin Fragnière
Keyword(s):  
Conceptual Analysis ◽  
Environmental Policies ◽  
Environmental Constraints ◽  
Political Arena ◽  
Individual Liberty ◽  
Philosophical Debate ◽  
Political Issues ◽  
Global Environmental Problems ◽  
Global Environmental ◽  
Two Alternatives

It is now widely acknowledged that global environmental problems raise pressing social and political issues, but relatively little philosophical attention has been paid to their bearing on the concept of liberty. This must surprise us, because the question of whether environmental policies are at odds with individual liberty is bound to be controversial in the political arena. First, this article explains why a thorough philosophical debate about the relation between liberty and environmental constraints is needed. Second, based on Philip Pettit’s typology of liberty, it assesses how different conceptions of liberty fare in a context of stringent ecological limits. Indeed, a simple conceptual analysis shows that some conceptions of liberty are more compatible than others with such limits, and with the policies necessary to avoid overshooting them. The article concludes that Pettit’s conception of liberty as non-domination is more compatible with the existence of stringent ecological limits than the two alternatives considered.

Dammed If You Don’t, But What If You Do? Breaching the Lower Snake River Dams in Washington State

2020 ◽  
Vol 4 (1) ◽  
pp. 1-12
Author(s):  
Elizabeth C. Lopardo ◽  
Clare M. Ryan
Keyword(s):  
Policy Process ◽  
Food Source ◽  
Washington State ◽  
Federal Agencies ◽  
Snake River ◽  
Environmental Groups ◽  
Steep Decline ◽  
Mitigation Techniques ◽  
Economic Analyses

Four dams on the lower Snake River in Washington State generate hydropower and allow for regional agriculture and barge shipping to Portland OR. However, the dams impede the migration of local salmon populations (Oncorhynchus spp.), which are in steep decline, and drastically impact the populations of salmon and orca whales, for whom salmon are a primary food source. For years, environmental groups have argued for breaching the dams; other interests counter that the dams are too critical to the economy of the region to lose; and federal agencies assert that the dams can remain and salmon populations will recover with mitigation techniques. Scientific and economic analyses, litigation, and elected officials’ efforts have not been able to move the issue towards a solution. Readers will examine the interests of primary actors in the issue, how they influence the policy process, the role of scientific and economic analyses, and possible approaches for resolving the issue.

Analyzing the liquidity ratios of the world's leading public oil and gas corporations

2020 ◽  
Vol 26 (7) ◽  
pp. 1571-1589 ◽  
Author(s):  
O.V. Shimko
Keyword(s):  
Public Sector ◽  
Oil And Gas ◽  
Comprehensive Analysis ◽  
Annual Reports ◽  
Main Factors ◽  
Economic Analyses ◽  
Oil And Gas Companies

Subject. This article explores the key liquidity figures of the twenty five largest public oil and gas companies between 2006 and 2018. Objectives. The article aims to determine the current values of the key liquidity figures of the largest public oil and gas companies, identify key trends in their changes within the study period, and identify the factors that have caused these changes. Methods. For the study, I used comparative, and financial and economic analyses, and generalization. Results. Based on a comprehensive analysis of the twenty five oil and gas companies' annual reports, the article identifies trends in the changes in the key liquidity indexes in the industry's public sector, and establishes the main factors that affected these changes. Conclusions and Relevance. The largest public oil and gas companies are able to maintain their own liquidity in times of crisis, even. The industry pays the most attention to increasing the instant liquidity ratios. The results of the study can be used to evaluate, forecast, and develop measures to enhance the liquidity of public oil and gas companies.

Analyzing the market valuations of the world's leading public oil and gas corporations

2020 ◽  
Vol 26 (12) ◽  
pp. 2765-2789
Author(s):  
O.V. Shimko
Keyword(s):  
Oil And Gas ◽  
Balance Sheet ◽  
Oil And Gas Industry ◽  
Market Valuation ◽  
Net Income ◽  
Consolidated Financial Statements ◽  
Market Capitalization ◽  
Economic Analyses ◽  
Market Valuations ◽  
Oil And Gas Companies

Subject. This article explores the market valuation ratios of the twenty five leading public oil and gas companies between 2006 and 2018. Objectives. The article aims to identify key trends in the changes in market valuations of the largest public oil and gas companies, and identify the factors that have caused these changes. Methods. For the study, I used comparative, and financial and economic analyses, and generalization of materials of the companies' consolidated financial statements. Results. The article shows certain changes in the main indicators of market valuation of the leading public oil and gas companies and identifies the main factors that contributed to these changes. It establishes that the most significant for comparison and valuation are ratios based on balance sheet values of assets and equity, and EBITDA, DACF and net income ratios are appropriate as auxiliary ratios. The article says that the exchange segment of the industry has increased the debt load, so instead of market capitalization as a component of the coefficients of this group, it is advisable to apply the company's value indicator. Conclusions and Relevance. The article concludes that the market sentiments towards the stock market segment of the global oil and gas industry are getting impaired. This is quite natural against the background of falling profitability of most leading companies. The results of the study can be useful in evaluating, forecasting and developing measures to increase the market capitalization and value of public oil and gas companies.

Experimental study of high rate pond system treating piggery wastewater

1996 ◽  
Vol 34 (11) ◽  
pp. 125-132 ◽  
Author(s):  
Baozhen Wang ◽  
Wenyi Dong ◽  
Jinlan Zhang ◽  
Xiangdong Cao
Keyword(s):  
Experimental Study ◽  
Energy Consumption ◽  
Flow Pattern ◽  
Fish Farming ◽  
High Rate ◽  
Land Area ◽  
Piggery Wastewater ◽  
Hydraulic Flow ◽  
Pond System ◽  
Economic Analyses

The results of an experimental study conducted in a full-scale high rate pond system treating piggery wastewater at Jianfengshan Piggery, Panyu City, Guandong Province, are presented. The system consists of two advanced anaerobic ponds (AAP) in parallel, followed by an anaerobic transformation pond (ATP) and a five-cell algae-bacterial pond (ABP). The mechanism of the AAP is described and the hydraulic flow pattern analyzed. Fermentation pits (FP) built on the bottom performed very efficiently, operating like UASB in principle. A new concept of ATP is advanced, based on its ability to transform poorly degradable materials to more easily degradable ones. It was found in the study that the HRP system was more efficient, more reliable and saved 40% land area compared with a conventional pond system. Economic analyses of both the energy consumption and the benefit to the pond system of fish farming are also included in the paper.

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