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            "title": "MAPPING TECHNOLOGICAL TRAJECTORIES AS PATENT CITATION NETWORKS:: A STUDY ON THE HISTORY OF FUEL CELL RESEARCH.",
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            "abstractNote": "Technological change is argued to be taking place along ordered and selective patterns, shaped jointly by technological and scientific principles, and economic and other societal factors. Historical, descriptive analysis is often used to analyze these \"trajectories\". Recently, quantitative methods have been proposed to map these trajectories. It is argued that such methods have, so far, not been able to illuminate the engineering side of technological trajectories. In order to fill this gap, a methodology proposed by Hummon and Doreian (1989) is used and extended to undertake a citation analysis of patents in the field of fuel cells. [ABSTRACT FROM AUTHOR]",
            "publicationTitle": "Advances in Complex Systems",
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            "date": "March 2007",
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            "pages": "93-115",
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                    "type": 1
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                    "tag": "PATENTS",
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                },
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                    "type": 1
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                    "tag": "TRAJECTORIES (Mechanics)",
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                    "tag": "fuel cells",
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                    "tag": "history of fuel cell research",
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            "creatorSummary": "Taymaz and Benli",
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            "title": "Numerical study of assembly pressure effect on the performance of proton exchange membrane fuel cell",
            "creators": [
                {
                    "creatorType": "author",
                    "firstName": "Imdat",
                    "lastName": "Taymaz"
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            "abstractNote": "The performance of the fuel cell is affectedby many parameters. One of the se parameters is assembly pressure that changes the mechanical properties and dimensions of the fuel cell components. Its first duty, however, is to prevent gasor liquid leakage from the cell and it is important for the contact behaviors of fuel cell components. Some leakage and contact problems can occur on the low assembly pressures whereas at high pressures, components of the fuel cell, suchas bipolar plates (BPP) , gas diffusion layers (GDL) , catalyst layers, and membranes, can be damaged. A finite element analysis (FEA) model is developed to predict the deformation effect of assembly pressure on the single channel PEM fuel cell in this study. Deformed fuel cell single channel model is imported to three-dimensional, computational fluid dynamics (CFD) model which is developed for simulating proton exchange membrane (PEM) fuel cells. Using this model, the effect of assembly pressure on fuel cell performance can be calculated. It is found that, when the assembly pressure increases, contact resistance, porosity and thickness of the gas diffusion layer (GDL) decreases. Too much assembly pressure causes GDL to destroy; the refore, the optimal assembly pressure is significant to obtain the highest performance from fuel cell. By using the results of this study, optimum fuel cell design and operating condition parameters can be predicted accordingly. Reprinted by permission of the publisher.",
            "publicationTitle": "Energy (Oxford, England)",
            "publisher": "",
            "place": "",
            "date": "May 2010",
            "volume": "35",
            "issue": "5",
            "section": "",
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            "pages": "2134-2140",
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            "tags": [
                {
                    "tag": "Deformation (Mechanics)--Finite element method",
                    "type": 1
                },
                {
                    "tag": "Proton exchange membrane fuel cells--Performance",
                    "type": 1
                },
                {
                    "tag": "Renewable energy sources",
                    "type": 1
                }
            ],
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