Rong Y.,Shanghai JiaoTong University |
Snyder L.V.,Lehigh University |
Shen Z.-J.M.,Environmental Operations
Naval Research Logistics | Year: 2017
When an unreliable supplier serves multiple retailers, the retailers may compete with each other by inflating their order quantities in order to obtain their desired allocation from the supplier, a behavior known as the rationing game. We introduce capacity information sharing and a capacity reservation mechanism in the rationing game and show that a Nash equilibrium always exists. Moreover, we provide conditions guaranteeing the existence of the reverse bullwhip effect upstream, a consequence of the disruption caused by the supplier. In contrast, we also provide conditions under which the bullwhip effect does not exist. In addition, we show that a smaller unit reservation payment leads to more bullwhip and reverse bullwhip effects, while a large unit underage cost results in a more severe bullwhip effect. © 2017 Wiley Periodicals, Inc. Naval Research Logistics 64: 203–216, 2017. © 2017 Wiley Periodicals, Inc.
Mohammed H.,Environmental Operations |
Hameed I.A.,Norwegian University of Science and Technology |
Seidu R.,Environmental Operations
2017 International Conference on Informatics, Health and Technology, ICIHT 2017 | Year: 2017
Norovirus represent a leading cause of acute gastroenteritis in most developed countries. Modeling of general microbial occurrence in drinking water is a very active field of study and provides reliable information for predicting microbial risks in drinking water. In this paper, an adaptive neuro-fuzzy inference system (ANFIS) is proposed as a predicting model of the total number of Norovirus in raw surface water in terms of water quality parameters such as water pH, turbidity, conductivity, temperature and rain. ANFIS model combines in a transparent manner the linguistic representations of fuzzy logic and the learning capabilities of artificial neural networks. It also provides an automated rule generation and parameter optimization procedure that simplifies the complex process of model development and finally creates a transparent solution that is expected to offer useful insights into either the physical processes involved or the resultant modeling mechanisms. This study is based on the analysis of raw water samples from Nødre Romrike water treatment plant in Oslo, Norway. The ANFIS model has shown remarkable prediction ability of the number of Norovirus in drinking water with high accuracy. Significant relationship between Norovirus, turbidity, conductivity and temperature is obtained based on model results. The findings suggest that Norovirus outbreaks may be predicted based on certain environmental factors. The ability to predict the Norovirus in drinking water would make the prevention of potential outbreaks possible by applying the proper water treatment for better health risk management. © 2017 IEEE.
Kirkman R.,Environmental Operations |
Proceedings of Institution of Civil Engineers: Energy | Year: 2010
This paper provides output data for the first year of operation of the new Sheffield energy recovery facility. It should be of interest to the energy provision community as a whole, but particularly to those promoting, planning, designing, constructing or operating a renewable electricity and heat energy facility utilising non-recyclable, kerbside-collected, municipal solid waste as fuel. An overview of the location of the facility and the extent of the associated district energy network is provided. Details of the fuel, energy output, emissions and operating data are given.
Turnipseed S.B.,U.S. Food and Drug Administration |
Romano J.,Environmental Operations
Journal of Agricultural and Food Chemistry | Year: 2013
The papers in this special issue of Journal of Agricultural and Food Chemistry were originally presented at the 49th annual Florida Pesticide Residue Workshop (FPRW). The FPRW is an annual meeting for scientists specializing in trace level analysis of pesticides, veterinary drug residues, and other chemical contaminants in food, animal feed, and environmental samples. © 2013 American Chemical Society.
Vickers J.,Environmental Operations |
DeJohn T.,Environmental Operations
Association of State Dam Safety Officials Annual Conference 2016, Dam Safety 2016 | Year: 2016
On July 8, 2015, New York City Department of Environmental Protection staff discovered a turbid discharge at the toe of Cannonsville Dam, a high hazard earthen embankment dam located near Deposit, NY. Cannonsville Dam impounds the West Branch Delaware River, forming Cannonsville Reservoir, the third largest reservoir in the New York City water supply. The turbid discharge developed during sub-surface boring exploration pursuant to design for a proposed hydro-electric plant at the toe of the dam. The turbid discharge was the result of open bore holes penetrating into an artesian formation located under the foundation of the dam. Seven relief wells were installed to temporarily halt the turbid discharge while compaction grouting was used to permanently close the open boreholes. The turbid discharge stopped by August 1, 2015. As of May 16, 2016 the reservoir returned to normal pool and the repairs continued to hold with no further turbid discharge.
Russell D.L.,Environmental Operations
Problemy Ekorozwoju | Year: 2010
This is a different approach to the subject of sustainability which suggests: 1) that certain activities are inherently unsustainable; 2) that sustainability be defined with regard to a basic level of technology, economy, and demand; 3) that sustainability can be better managed by looking at the energy and waste and consumption from manufacturing, and treating the technologies as "black boxes"; 4) the environmental permit data from manufacturing concerns needs to be made more public because the effect of the publication of that information will enhance pollution reduction; 5) that we need to define pollution receptors and assign the costs to develop trans-boundary solutions; and 6) that there is a lot of fruitful work still to be performed on developing very good estimates of the capacity of agricultural, non-agricultural, and oceanic receptors.
Iida Y.,Environmental Operations
NEC Technical Journal | Year: 2011
Next year 2012, is the 20th anniversary of the 1st Earth Summit that was held in Rio de Janeiro in 1992. The international mechanisms for conserving the Earth proposed there, such as the reduction of Greenhouse Gas (GHG) emissions and the conservation of biodiversity have tended to diversify the range of commercial activity. The future calls not for measures that are confined exclusively to an enterprise, region or nation, but for those that are applicable on a global scale. With such measures, the fundamentals can be summarized into the three layers of "observation," "analysis" and "proposal and execution of the actual measures." M2M can act as a platform for processing these three layers within the framework of the ICT (Information and communications technology) infrastructures. This paper discusses the new values that will be added in the automation and integration of global-scale "observations" and "analyses" by combining the extensive spatial sensor technology owned by NEC with the M2M technologies.
Ferreira J.A.Z.,Environmental Operations |
Ferreira J.A.Z.,University of Texas at Austin |
Zornberg J.G.,University of Texas at Austin
Geotechnical Testing Journal | Year: 2015
This paper presented a newly developed transparent pullout testing device conceived with the objective of studying the soil-geogrid interaction under small displacements and strains. The bottom plate and the side walls of the pullout box were transparent. The system involved a transparent soil, which was tested as a surrogate for sands in the testing program. The setup led to 3D visualization of the soil-geogrid interaction as it allowed direct visualization of the plan view of the geogrid as well as of the side view of the soil-geogrid interface. Markers embedded in the transparent soil mass allowed tracking of soil particle displacements during the test. The tests were conducted using a polypropylene biaxial geogrid and both transparent soil and a conventional sand. Displacements along the geogrid were obtained continuously using digital image correlation (DIC) techniques in tests with transparent soil, and using telltails at five junctions in tests with sand. Comparison of test results with both soils showed that the transparent soil constitutes a good surrogate for sands in pullout studies. The pullout test with transparent soil also indicated that displacements along the geogrid could be properly described using an exponential function. Moreover, exponential fitting to the displacement data led to an exponential distribution of strains along the geogrid during pullout testing. Deflections of transverse ribs were first observed at early stages of the test when only 25 % of the maximum pullout force developed. The observed displacement patterns of the soil markers were useful in defining the zone of influence of the geogrid, which could be successfully quantified using the newly developed testing device. Overall, the new equipment was found to represent an effective tool to better understand the mechanisms involved in soil-geogrid interaction, particularly those that are relevant to quantify the interface stiffness. Copyright © 2015 by ASTM Int'l (all rights reserved).
News Article | December 19, 2016
SPRINGFIELD, VA / ACCESSWIRE / December 19, 2016 / Versar, Inc. (NYSE MKT: VSR) announced today that the Versar-ERRG Joint Venture team was awarded the Environmental Services & Construction ID/IQ contract for the Pacific Air Forces Region (ES&C-PACAF) with a contract ceiling to be shared among eight awardees totaling $48 million. This new contract, for work on behalf of the Air Force Civil Engineer Center (AFCEC), provides for the performance of Environmental Operations and Services, Environmental Restoration, and Environmental Construction services. It is intended to facilitate environmental programs and related work in AFCEC's PACAF region, including potential task order assignments in Alaska, Hawaii, and Korea/Japan. The contract vehicle has a five-year ordering period, during which task orders may be awarded and performed. Any awarded work may also be performed for three additional years following the basic five-year ordering period. Versar is the managing partner of the Joint Venture. Tony Otten, CEO of Versar, said, "We are very pleased to continue our work with AFCEC and recognize the importance of the PACAF region to the U.S. Air Force and the Defense Department in the coming years. AFCEC is a significant and long-standing Versar customer. Through our proven remediation capabilities and ongoing environmental work with ERRG, Inc., the Joint Venture offers AFCEC a dedicated and highly qualified team for assignments in the United States and around the world." Cindy Liu, President and CEO of ERRG, said, "We are honored that our Joint Venture team was selected by AFCEC to support PACAF, and we look forward to providing meaningful and practical solutions to the environmental challenges facing AFCEC. Additionally, we are delighted that this contract allows us to continue the highly successful working relationship between Versar and ERRG that began in 2011." VERSAR, INC., headquartered in Springfield, Virginia, is a publicly-traded global project management company providing sustainable value oriented solutions to government and commercial clients in the construction management, environmental services, and professional services market areas. VERSAR operates the following websites: www.versar.com and www.versarpps.com. Find out more about VERSAR at: This news release contains forward-looking information. The forward-looking statements are made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements may be significantly impacted by certain risks and uncertainties described herein and in Versar’s Annual Report on Form 10-K filed with the Securities and Exchange Commission for the fiscal year ended June 26, 2015, as updated from time to time in the Company’s periodic filings. The forward-looking statements are made as of the date hereof and Versar does not undertake to update its forward-looking statements.