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Tan, Raymond Girard R, Ph. D.: Home


Dr. Raymond Girard R. Tan

Scope Note

     Accessible on the net, this webliography consists of selected papers, articles and abstracts of researches written by Dr. Raymond Girard R. Tan with other authors. 

     Dr. Raymond Girard R. Tan is a University fellow and a full professor of the Chemical Engineering Department at De La Salle University and is the author of more than thirty articles in ISI-indexed journals. He finished Doctor of Philosophy in Mechanical Engineering in 2002, Master of Science in Mechanical Engineering in 1998 and Bachelor of Science in Chemical Engineering in 1994 from De La Salle University, Manila. His fields of specialization include: environmental system modeling life cycle assessment (LCA), environmental decision support systems, life cycle analysis, environmental decision support systems, process mass integration/water pinch technology, fuzzy modeling techniques and chemical engineering. He is a member of the editorial board of the ISI-indexed Springer Journal Clean Technologies and Environmental Policy; Visiting Researcher at Chung Yuan University, Taiwan (January, 2008); University of Nottingham Malaysia Campus, Malaysia (March, 2007; April 2008); Universiti Teknologi Malaysia, Malaysia (August, 2006; February, 2008); International Flame Research Foundation, The Netherlands (September - December, 2004); University of Portsmouth, United Kingdom (January - March, 2001). His scientific awards include : Outstanding Scientific Paper Award from the National Academy of Science and Technology (2008, 2006 and 2004); Achievement Award from the National Research Council of the Philippines (2007); Outstanding Poster Presentation at the 28th Annual Scientific Meeting of the National Academy of Science and Technology (2006); Outstanding Young Scientist Award from the National Academy of Science and Technology (2004); Special Citation in the National Academy of Science and Technology-DuPont Talent Search for Young Scientists (2004); Miguel Febres Cordero Research Award from De La Salle University (2004); Outstanding Doctoral Dissertation from De La Salle University (2002).


Internet Sites

Application of symmetric fuzzy linear programming in life cycle assessment
[Retrieved July 28, 2009]

"Life cycle assessment (LCA) is known to entail multiple objective decision-making in the analysis of tradeoffs between different environmental impacts. The work of Azapagic and Clift in the late 1990s illustrates the use of multiple objective linear programming (MOLP) in the context of LCA. However, it will be noted that their approach yields a range of Pareto optimal alternatives from which the decision-maker must ultimately select the final solution. An alternative approach making use of Zimmermann�s symmetric fuzzy linear programming method is proposed and illustrated with a simple case study. The procedure effectively yields a single, optimal compromise solution."

Assessing the Sensitivity of Water Reuse Network to Noisy Mass Loads Using Monte Carlo Simulation
[Retrieved July 28, 2009]

"Written with D. C. Y. Foo, Z. A. Manan, this paper demonstrates the use of Monte Carlo simulation for testing the robustness of alternative water reuse network designs. The methodology shown allows designers to test alternatives that achieve similar water reduction targets but may potentially differ in terms of vulnerability to mass load fluctuations."

A Comparative Analysis of Six Life Cycle Impact Assessment Methodologies
[Retrieved July 28, 2009]

"Written with Kathleen Aviso and Alvin Culaba, this paper presents the four life cycle impact (LCIA) methodologies utilized to quantify the environmental impacts of 10 energy system transportation gases. The inventory assessment results from GREET 1.5a were utilized for the following pollutant: were CO2, CH4, N2O, CO, SOx, NOx, VOC and PM10. Results showed that the greenhouse gases had the highest impact contribution. All LCIA methods agreed that hydrogen is the best fuel. Based on correlation analysis, FRED, EDIP and chemical exergy gave comparable results based on ranking while critical volumes, ecological footprint and LCA-NETS showed lower correlation. Correlation of these provides a means of reconciling the different methodologies for more comprehensive decision support."

Comparative Environmental LCA of Coconut Biodiesel and Conventional Diesel for Philippine Automotive Transportation and Industrial Boiler Application
[Retrieved July 16, 2009]

"Written with Liezzel M. Pascual, �this study quantitatively assessed the total environmental impacts from emissions and energy consumptions of coconut biodiesel and petroleum or conventional diesel from the raw materials to the final use using environmental life cycle assessment (LCA). Matrix-based calculations are used for the Life Cycle Inventory (LCI), which are coded in Microsoft Excel spreadsheet environment. The Life Cycle Impact Assessment (LCIA) was performed through the use of critical volumes method and ecological footprint. Input data for model calibration are derived from theoretical mass and energy balances, technical publications, industry average values and government databases."

Comparative Life-Cycle Analysis of the Bioethanol and Biomenthanol Pathways for Recycling Solid Waste into Liquid Fuel (Abstract)
[Retrieved July 16, 2008]

"Available on URCO digest (vol. VI no. 1, August 2004, page 6), this article presents the comparative life-cycle analysis of bioethanol and biomethanol, two liquid biomass-derived fuels that have promising applications as automotive fuels."

Crisp and Fuzzy Optimisation Approaches for Water Network Retrofit
[Retrieved July 16, 2009]

"With Seingheng Hul, Denny K. S. Ng, Choon-Lai Chiang, and Dominic C. Y. Foo, this paper presents that "material reuse/recycle has gained much attention in recent years for both economic and environmental reasons. Process integration techniques for water network synthesis have evolved rapidly in the past decade. With in-plant water reuse/recycle, fresh water and wastewater flowrates are reduced simultaneously. In this work, linear programming and mixed integer linear programming models that include piping cost and process constraints are developed to retrofit an existing water network in a paper mill that was not originally designed with process integration techniques. Five scenarios are presented, each representing different aspects of decision-making in real process integration projects. The fifth scenario makes use of fuzzy optimisation to achieve a compromise solution that considers the inherent conflict between maximising water recovery and minimizing capital cost for retrofit."

Fuzzy Data Reconciliation in Life Cycle Inventory Analysis
[Retrieved July 16, 2009]

"Written with Dr. Alvin Culaba, this article "demonstrates a simple and computationally efficient method for data reconciliation using fuzzy linear programming. The model is suitable for life cycle inventory analysis as well as related procedures such as substance flow analysis. Unlike conventional data reconciliation methods which typically result in highly nonlinear stochastic models, the method shown retains its linearity for basic triangular or trapezoidal fuzzy distributions and can thus be implemented with ease in commercial spreadsheet software."

A Fuzzy Decision Support Model for the Selection of Environment-Friendly Fuels for Road Vehicles
[Retrieved July 24, 2009]

"With Dr. Alvin Culaba, this paper presents that "the application of fuzzy multiple attribute decision making (FMADM) in an LCA model for comparing alternative transportation fuels. The methodology allows quantitative information on the transportation systems' material and energy flows to be integrated with qualitative information reflecting such aspects as the social acceptability of different types of environmental damage. Fuzzy numbers are used to represent uncertainties in the data so that the model can predict both the magnitude of the environmental impacts of the alternative fuels and the corresponding confidence levels of these estimates. Results of a case study show biodiesel to be superior to both CNG and diesel in terms of overall environmental impact."

Life-Cycle Assessment of Conventional and Alternative Fuels for Road Vehicles
[Retrieved July 22, 2009]

"With Dr. Alvin B. Culaba, this paper discusses the results of the life-cycle assessment (LCA) of several conventional and alternative motor vehicle fuels. "The analysis was accomplished using the composite program EDIP-GREET, which is based on the Danish EDIP impact assessment and the American GREET 1.5a fuel-cycle models. The options evaluated included conventional fuels (gasoline and diesel), biofuels (bioethanol and biodiesel) and natural gas derivatives (LNG, CNG and methanol), with the analysis being limited to air pollution and resource depletion impacts. Sensitivity analysis was also used to determine the effect of electrical power generation mix on total environmental impacts. The model outputs indicate no significant over-all benefits resulting from the substitution of natural gas-based fuels for gasoline. On the other hand, the use of bioethanol and biodiesel in place of gasoline and diesel, respectively, is expected to yield significant gains particularly with respect to greenhouse gas emissions and fossil fuel depletion."

Life Cycle Design, Planning, and Assessment
[Retrieved July 22, 2009]

"With Alvin B. Culaba, Michael R. I. Purvis and Joel Q. Tanchuco, this paper presents that "energy and environmental concerns are intricately linked to the supply chains of various goods. Increased public awareness of such issues is reflected in the contemporary business environment as well as government legislation. Companies must not only comply with environmental regulations, but also contend with the need for increasingly green corporate practices in order to stay competitive in global markets. Thus, it is necessary to apply systematic techniques to quantify the environmental impacts of supply chains, and to identify opportunities for making improvements. This chapter discusses life cycle assessment principles and its application in the design and planning of industrial supply chains. A specific case study on the production of biofuels from agricultural crops is used to illustrate the key concepts."

Pinch Analysis Approach to Short-Term Scheduling of Batch Reactors in Multi-Purpose Plants
[Retrieved July 22, 2009]

"With Dominic C. Y. Foo and Nick Hallale, "this work describes an alternative approach based on pinch analysis, which has been used since the 1970s for applications ranging from conservation of industrial utilities in process plants, to management problems in supply chains, financial planning and emissions control. All these applications assume that valuable resources need to be allocated to different demands with both quantity and quality specifications. Pinch analysis is shown here to be applicable to visualizing and analyzing the scheduling and allocation of batch reactors in multi-purpose plants. Two specific types of problems are described. The pinch analysis approach is demonstrated using illustrative case studies. The pinch analysis approach allows for quick identification of processing bottlenecks and provides rules for subsequent detailed scheduling."

Possibilistic Uncertainty Propagation and Compromise Programming in the Life Cycle Analysis of Alternative Motor Vehicle Fuels
[Retrieved July 22, 2009]

"With Dr. Alvin Culaba and Michael R. I. Purvis, this article presents that "data noise often does not allow definitive results to be drawn from life cycle assessments (LCAs). The use of possibility theory to model data uncertainty led to the development of an LCA model that is able to derive useful conclusions to a specified level of confidence. The specific decision domain in this study involves the identification and selection of the best environmental option from ten different automotive fuels."

Ranking of Waste Management Options under Conditions of Possibilistics Uncertainty Using Fuzzy SAW [Abstract Only]
[Retrieved July 16, 2009]

"Integrated waste management involves the use of appropriate techniques ranging from pollution prevention/cleaner production (P2/CP) to conventional end-of-pipe controls. Design or retrofit of process plants usually entails selection of an optimal waste management measure from a number of alternatives. The selection process involves consideration of multiple criteria and data uncertainty, the latter being arguably possibilistic (fuzzy) rather than probabilistic (random) in nature. A fuzzy simple additive weighting (SAW) algorithm is proposed for such problems and demonstrated on a case study. The principal feature of the techniques shown is the retention of fuzzy confidence levels during the assessment of different technological options."

Recent Trends in Pinch Analysis for Carbon Emissions and Energy Footprint Problems
[Retrieved July 22, 2009]

"With Dominic Chwan Yee Foo, this paper states that "climate change has recently become a major focus of industry and government agencies. Pinch analysis techniques have now been extended to various carbon and environmental-constrained problems. The first applications were meant to determine the minimum amount of zero- or low-carbon energy sources needed to meet regional or sectoral emission limits. The concept was later extended to segregated targeting with regions using unique sets of energy sources, and for targeting retrofits for carbon sequestration in the electricity sector. Furthermore, the pinch analogy was used for energy planning in scenarios involving land and water footprints. Graphical, algebraic and automated targeting variants have been developed for these problems. This paper discusses the historical evolution of recently developed pinch analysis techniques for the various emission- and footprint-related problems, along with their contributions and limitations. Some recent applications in Ireland and New Zealand are also reviewed. Finally, a new application of the use of composite curves for company-level analysis of carbon footprint improvement options is described."