Home About us Contact
|
Home About us Contact | ||
|
|
||
Entire Field (entire + field)
Selected AbstractsApplying the Collective Causal Mapping Methodology to Operations Management Curriculum Development,DECISION SCIENCES JOURNAL OF INNOVATIVE EDUCATION, Issue 2 2007Julie M. Hays ABSTRACT Although the field of operations management has come a long way since its beginnings in scientific management, the field still appears somewhat amorphous and unstructured to many. Introductory operations management textbooks usually include a number of largely disjointed topics, which leave many students (and their instructors) without a coherent framework for understanding the field. As a result, the importance and sequencing of topics varies widely between courses and instructors, even within the same university. This article applies the newly developed Collective Causal Mapping Methodology to create a causal map for the entire field of operations management. The causal map is built on expert opinions collected from over 250 academics and practitioners representing many areas of expertise, schools, organizations, and countries. This collective causal map is then used to create a new framework for understanding and teaching operations management. This framework can aid instructors in determining which topics should be taught in an operations management course, how these topics might be grouped and sequenced, and the important interrelationships among the topics that should be stressed to students. [source] Missing links: Eugène Dubois and the origins of paleoanthropologyEVOLUTIONARY ANTHROPOLOGY, Issue 3 2002Pat Shipman Abstract Examining the origins of various scientific fields may help to identify particular individuals whose thought, work, and discoveries have had a disproportionately large influence. Such individuals seem to serve as catalysts for a wider set of intellectual reactions, which then give rise to an entire field of study. In this paper, we propose explicit criteria for recognizing the founders of new fields. We contend that Eugène Dubois, best known as the man who found the "missing link" between apes and humans, should be recognized as one of the founding fathers of paleoanthropology. [source] Determination of mean free path for energy loss and surface oxide film thickness using convergent beam electron diffraction and thickness mapping: a case study using Si and P91 steelJOURNAL OF MICROSCOPY, Issue 2 2006D. R. G. MITCHELL Summary Determining transmission electron microscope specimen thickness is an essential prerequisite for carrying out quantitative microscopy. The convergent beam electron diffraction method is highly accurate but provides information only on the small region being probed and is only applicable to crystalline phases. Thickness mapping with an energy filter is rapid, maps an entire field of view and can be applied to both crystalline and amorphous phases. However, the thickness map is defined in terms of the mean free path for energy loss (,), which must be known in order to determine the thickness. Convergent beam electron diffraction and thickness mapping methods were used to determine , for two materials, Si and P91 steel. These represent best- and worst-case scenario materials, respectively, for this type of investigation, owing to their radically different microstructures. The effects of collection angle and the importance of dynamical diffraction contrast are also examined. By minimizing diffraction contrast effects in thickness maps, reasonably accurate (±15%) values of , were obtained for P91 and accuracies of ±5% were obtained for Si. The correlation between the convergent beam electron diffraction-derived thickness and the log intensity ratios from thickness maps also permits estimation of the thickness of amorphous layers on the upper and lower surfaces of transmission electron microscope specimens. These estimates were evaluated for both Si and P91 using cross-sectional transmission electron microscopy and were found to be quite accurate. [source] CONSTRAINTS ON DIAGENESIS AND RESERVOIR QUALITY IN THE FRACTURED HASDRUBAL FIELD, OFFSHORE TUNISIAJOURNAL OF PETROLEUM GEOLOGY, Issue 1 2001C. I. Macaulay The hydrocarbon reservoir of the Hasdrubal field (offshore Tunisia) lies within the Eocene El Garia Formation. This formation was deposited on a shallow north- to NE-facing ramp in the Early Eocene and is composed of a belt of nummulitic wackestones-grainstones. The nummulitic fades occupies a range of depositional environments from outer to mid ramp. In addition to Hasdrubal, several other producing oil- and gasfields have been discovered in the variably dolomitised El Garia Formation offshore Tunisia. Cores from three Hasdrubal wells were examined. Reservoir quality shows a limited relationship to primary depositional fabric and has been influenced significantly by compaction and later diagenesis. The highest permeabilities are typically developed within a dolomitised zone which occurs near the middle of the reservoir interval across the entire field, and which may follow a primary wackestone lithofabric (typically 20,30% bulk volume dolomite, with porosities of 15,22% and permeabilities of l-30mD). Fractures, particularly in zones surrounding faults, have resulted in enhanced permeabilities. Combined results of isotope (,18 O -5.0 to -7.3%oPDB) and fluid inclusion (Th 80,90d,C) analyses of dolomites from this dolomitised zone indicate that matrix dolomites are burial diagenesis cements. Dolomitisation of the reservoir was a "closed system " event and was not the result of major fluid flow or mixing. Magnesium ions for dolomitisation were derived from the transformation of high-Mg to low-Mg calcite in nummulite tests within the reservoir fades. Our analyses indicate that calcite cements were precipitated at temperatures of up to almost 150d,C in primary and secondary pores and in variably-sealed fractures Fracture lining and filling cements show a range of ,18 O values, which suggests that the fractures acted as fluid conduits over a range of temperatures during burial diagenesis Fracture densities measured in core increase rapidly close to seismically-resolvable faults in the reservoir facies Fracturing probably resulted in the leakage of hydrocarbons through the Compact Micrite Member seal which overlies the accumulation, as well as facilitating the ingress of hot fluids from stratigraphically deeper levels in the basin [source] Opportunities for enhanced collaboration within the data assimilation communityTHE QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY, Issue 613 2005Dennis McLaughlin Abstract Recent advances in sensor technology, telecommunications and computation open up new possibilities for the application of data assimilation concepts across the Earth sciences. As a result, the data assimilation community is expanding beyond meteorology and oceanography to include representatives from climatology, hydrology, atmospheric chemistry, ecology and other disciplines. This development offers new opportunities for collaboration between the operational and research sides of the community. Opportunities exist not only in traditional forecasting applications, but also in areas such as reanalysis, model diagnosis, development of new model parametrizations, and observing-system design. Disciplinary scientists from outside the traditional data assimilation community are starting to appreciate that data assimilation can provide an integrated view of earth processes over a range of time and space scales. Operational data assimilation groups have special expertise and capabilities that are needed by newcomers to the field. If the scope of the operational community expands to include a wider range of applications, the entire field will likely benefit from new ideas, new resources, and increased visibility and recognition. Copyright © 2005 Royal Meteorological Society [source] Differential Classification of Acute Myocardial Infarction into ST- and Non-ST Segment Elevation Is Not Valid or RationalANNALS OF NONINVASIVE ELECTROCARDIOLOGY, Issue 3 2010Brendan Phibbs M.D., F.A.C.C. Background: The distinction between ST elevation and nonST elevation infarcts is widely accepted and is employed as a guide to management. Aim: This is review of the world literature to assess the basis for this distinction, since the two studies on which it is based are seriously flawed in method and conclusions. Method: Pathologic and clinical studies were reviewed from the world literature. Finding: The pathology of the two subsets is identical as are the morbidity, mortality and clinical course. Non-ST elevation infarcts are likely to be subsequent, to occur in older patients and to involve the circumflex artery: this subset therefore includes a high-risk group. ST deviation in any part of the electric field of the heart will predictably be accompanied by reciprocal deviation if the entire field of the heart is mapped. Further, ST deviation of infarction is often transient, resolving in minutes so that infarcts will be predictably misclassified. ST deviation per se is therefore not a rational basis for classification of infarcts. In fact, invasive therapy is indicated in both subsets with identical results. Conclusion: The distinction between ST elevation and non-ST elevation infarcts is baseless. The high risk subgroup included in the non-ST elevation infarct set should not be denied the benefit of early invasive therapy. Ann Noninvasive Electrocardiol 2010;15(3):191,199 [source] Zur Anwendung von Expositionsklassen bei ParkhäusernBETON- UND STAHLBETONBAU, Issue 9 2004Manfred Curbach Prof. Dr.-Ing. Der Beitrag beschreibt die Anwendung der Expositionsklassen von DIN 1045-1 für direkt befahrene Parkdecks und aufgehende Bauteile in Parkhäusern. Die Auswahl der Expositionsklassen für Parkhäuser wurde in den letzten Monaten intensiv in der Fachwelt diskutiert. Als Ergebnis dieser Diskussion wird der DBV in den nächsten Monaten ein Merkblatt "Parkhäuser und Tiefgaragen" veröffentlichen. Neben der genannten Problematik werden auch weiterführende Nachweise der Dauerhaftigkeit erwähnt. About the Exposure Classes in Car Parks The paper deals with the application of exposure classes in car parks. The choice of exposure classes has been seen as a problem over the last few months and has been intensively discussed among experts. The DBV will soon publish a bulletin not only to deal with this problem but to cover the entire field of multi-storey car parks and underground car parks as well. Additionally other types of proofs of durability are mentioned in this paper. [source] | |||||||||||||