N. MacLeod's Articles: (4)

The determination of local mass-transfer coefficients by holographic interferometry—IDetermination des coefficients de transfert massique locaux par holographie interferometriqueDie bestimmung von örtlichen stoffübergangskoeffizienten mit hilfe der holographischen interferometrie Allgemeine grundlagen: ihre anwendung und überprüfung für stoffübergangsmessungen an einer ebenen platte in einem laminaren runden luftstrahlOпpeдэлэHиэ лoкaльHыч кoэффициэHтoв мaccoпepeHoцa C пoмoщью гoлoгpaфичэcкoй иHтэpфэpoмэтpии — и oьщиe пpиHпипы: ич пpимэHэHиe и HaдeзHocть пpи измepeHии мaccoпepгHoca Ha плocкoй плacтиHe oьтгкaгмoй лaмиHapHым пoтoкoм вoзлuшa: General principles: Their application and verification for mass-transfer measurements at a flat plate exposed to a laminar round air-jet

AbstractMethods are described of applying the powerful techniques of holographic interferometry to the profilometric measurement of mass-transfer rates at solid-fluid interfaces, with great advantages of speed, precision and comprehensiveness of data acquisition and display.Maintenance of virtually constant optical quality at the transferring surface, vital for the production of satisfactory interferograms, is effected by the use of a mass-transferring coating consisting of a smooth layer of elastomer initially charged with a volatile (or soluble) swelling agent. Shrinkage of this coating due to transfer of the swelling agent to the fluid stream can then be recorded as an array of interference fringes when reflection or transmission holograms of the initial and final states of the surface layer are superimposed. Such interferograms provide a synoptic record of the spatial variation of transfer coefficient over the entire surface viewed at the holographic plate.The precision and completeness of the data provided by these methods is demonstrated here by their application to the mapping of the transfer coefficient variation over the surface of a flat plate exposed to normal or tangential laminar air jets of known velocity. For the former case the results agree closely with an available analytical solution.

Use of wing morphometrics to identify populations of the Old World screwworm fly, Chrysomya bezziana (Diptera: Calliphoridae): A preliminary study of the utility of museum specimens

Highlights•Wing morphometry was significantly different between wings on flies and on slides.•A highly significant sexual dimorphism in wing morphometry was identified.•Wing morphometry was significantly different between African and Asian flies.•Wing orientation and sex must be controlled in morphometric studies of OWS fly.•Wing morphometry holds promise to distinguish geographical populations of OWS fly.

Geometric morphometrics and geological shape-classification systems

AbstractMany areas of geological inquiry involve the description and/or comparison of shapes. While various morphometric tools have long been available to facilitate these types of comparisons, by far the most common approach to such form-classification has been via the creation of a semiquantitative scale of morphological exemplars, type specimens, etc. to which unknown structures, objects, or specimens can be compared. Such form-scales are ubiquitous—either in terms of text-based descriptions or illustration sets—throughout the geological literature. However, students, and even experienced geologists, often have difficulty using such scales and achieving consistent results. Investigations of three such scales drawn from the fields of sedimentology, paleontology, and geomorphology using the analytical tools of geometric morphometrics suggests that one reason for this difficulty is that the exemplars drawn from sets of real objects (1) often exhibit shape differences other than those under nominal consideration or (2) are used to represents object classes whose boundaries are insufficiently documented or described. Herein, strategies are developed that employ the ordination and modeling capabilities of eigenshape analysis to correct these deficiencies and devise sets of new, more representative, and easier to use shape-classification systems. By employing these approaches, augmented where necessary with formal statistical analyses, geologists can improve the sophistication, accuracy, and reproducibility of their morphological inferences. In doing this, they will also improve the reliability of their hypotheses tests.

Original ArticleWhat are the minimal standards of radiotherapy planning and dosimetry for “hypofractionated” radiotherapy in breast cancer?

AbstractHypofractionated radiotherapy regimens have become increasingly popular in breast cancer, particularly in the UK and Canada. However, there are some potential problems inherent to providing such regimens, such as the concern of increased toxicity. In this article we discuss the planning and dosimetry and requirements for hypofractionated radiotherapy in breast cancer and make recommendations both for the planning process and for treatment monitoring.

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