scholarly journals Keith Richard Greenaway

Polar Record ◽  
2010 ◽  
Vol 48 (4) ◽  
Author(s):  
Geoffrey Hattersley-Smith
Keyword(s):  
North America ◽  
Practical Experience ◽  
Magnetic Compass ◽  
High Latitudes ◽  
Gyro System ◽  
Standard Textbook ◽  
Gyro Compass ◽  
Gyro Drift

Keith Richard Greenaway, who died on 21 May 2010, aged 94, established himself early in his career as the pre-eminent authority in north America on Arctic air navigation. He was only a flight lieutenant, RCAF, with 11 years service when he published his Arctic air navigation (1951), which immediately became the standard textbook in its field. The book deals with all aspects of air navigation, bringing information scattered in various publications together with the author's already very wide practical experience. The heart of the book details the limitations of the magnetic compass in high latitudes and sets out procedures in the reliable Asco-Gyro system of navigation, which Greenaway did so much to develop and which involves the determination of aircraft heading by astro compass and the maintenance of direction by gyro compass, continuously corrected for gyro-drift.

scholarly journals THE GENUS PODISMA IN EASTERN NORTH AMERICA

1903 ◽  
Vol 35 (11) ◽  
pp. 295-302
Author(s):  
E. M. Walker
Keyword(s):  
North America ◽  
Eastern North America ◽  
High Latitudes ◽  
Old World ◽  
Number Of Species ◽  
Alpine Distribution

Podisma (Latr.) is a particularly interesting genus of Melanopli, since it is the only one of that immense group that occurs in the Old World, where, indeed, it is represented by considerably more described species than it is in North America. It is also of interest from its distinctly boreal and alpine distribution, being almost peculiar to high latitudes or altitudes. It is a circumpolar genus, inhabiting the mountains and boreal parts of Europe, Asia and North America, a larger number of species having been described from Europe than elsewhere.

Do centers of origin have a center?

Paleobiology ◽  
1981 ◽  
Vol 7 (3) ◽  
pp. 305-307 ◽  
Author(s):  
John C. Briggs
Keyword(s):  
United States ◽  
North America ◽  
Southeastern United States ◽  
Important Criterion ◽  
Centers Of Origin ◽  
Single Region ◽  
Evolutionary Radiation ◽  
A Current ◽  
Considerable Intensity

A current question being debated with considerable intensity is whether or not certain geographic areas act as centers of evolutionary radiation and supply species to other areas that are less active or less effective in an evolutionary sense. Darwin (1859) was the first to write about centers of origin which he called “single centers of creation.” He argued that each species was first produced within a single region and that it subsequently migrated from that area as far as its powers of migration and subsistence under past and present conditions permitted. Adams (1902), in discussing the influence of the southeastern United States as a center of distribution for the flora and fauna of North America, provided a series of criteria for the determination of “centers of dispersal.” His first, and evidently most important criterion was the location of “the greatest differentiation of a type.”

Fossil flower of Staphylea L. from the Miocene amber of Mexico: New evidence of the Boreotropical Flora in low-latitude North America

2017 ◽  
Vol 108 (4) ◽  
pp. 471-478 ◽  
Author(s):  
Ana L. Hernández-Damián ◽  
Sergio R. S. Cevallos-Ferriz ◽  
Alma R. Huerta-Vergara
Keyword(s):  
North America ◽  
Northern Hemisphere ◽  
Fossil Record ◽  
First Record ◽  
High Latitudes ◽  
Low Latitude ◽  
Southern Mexico ◽  
Apparent Lack ◽  
History Of ◽  
New Evidence

ABSTRACTA new flower preserved in amber in sediments of Simojovel de Allende, México, is identified as an extinct member of Staphyleaceae, a family of angiosperms consisting of only three genera (Staphylea, Turpinia and Euscaphis), which has a large and abundant fossil record and is today distributed over the Northern Hemisphere. Staphylea ochoterenae sp. nov. is the first record of a flower for this group, which is small, pedicelled, pentamer, bisexual, with sepals and petals with similar size, dorsifixed anthers and superior ovary. Furthermore, the presence of stamens with pubescent filaments allows close comparison with extant flowers of Staphylea bulmada and S. forresti, species currently growing in Asia. However, their different number of style (one vs. three) and the apparent lack of a floral disc distinguish them from S. ochoterenae. The presence of Staphyleaceae in southern Mexico ca. 23 to 15My ago is evidence of the long history of integration of vegetation in low-latitude North America, in which some lineages, such as Staphylea, could move southwards from high latitudes of the Northern Hemisphere, as part of the Boreotropical Flora. In Mexico it grew in association with tropical elements, as suggested by the fossil record of the area.

The Early History of the Gyroscope and Gyro Compass

1970 ◽  
Vol 24 (1) ◽  
pp. 86-89
Author(s):  
G. B. Lauf
Keyword(s):  
Current Literature ◽  
Early History ◽  
Historical Account ◽  
Half Century ◽  
History Of ◽  
The Subject ◽  
Gyro Compass

Most of the current literature in the field of gyroscopic theory and in the use of gyroscopic instruments for the determination of azimuth begins the historical account of the subject with the work of Leon Foucault during the period 1850-1852. But little is known of the work in this field by others during the preceding half century. In this paper, the development of the gyroscope and gyro compass is traced back to a date earlier than 1813.

Determination of Honey Authenticity by Anion-Exchange Liquid Chromatography

1994 ◽  
Vol 77 (3) ◽  
pp. 695-702 ◽  
Author(s):  
Kevin W Swallow ◽  
Nicholas H Low
Keyword(s):  
Liquid Chromatography ◽  
North America ◽  
Anion Exchange ◽  
Amperometric Detection ◽  
High Fructose Corn Syrup ◽  
Pulsed Amperometric Detection ◽  
Corn Syrup ◽  
Low Concentrations ◽  
High Fructose

Abstract Methodology using anion-exchange liquid chromatography with pulsed amperometric detection was developed to determine the addition of invert syrups (beet or cane) and high-fructose corn syrup to honey. The invert syrups used were either chemically (commercially) or enzymatically prepared. Fingerprint oligosaccharides were shown to be present in these sweeteners, which were either not detectable or present at low concentrations in pure honey. Forty-four pure honey samples produced in continental North America, Hawaii, China, and Australia were used in this study.

Arctic flights of the Aries, 1951

Polar Record ◽  
1952 ◽  
Vol 6 (44) ◽  
pp. 474-483 ◽  
Author(s):  
J. L. Mitchell
Keyword(s):  
Air Force ◽  
Practical Experience ◽  
Cold Weather ◽  
The Arctic ◽  
High Latitudes ◽  
Royal Air Force ◽  
Training Course ◽  
Arctic Regions ◽  
The World ◽  
One Year

The Royal Air Force Flying College at Manby in Lincolnshire, England, was established in 1949. During a training course lasting one year, experienced pilots and navigators study all aspects of the operation of an aircraft as a weapon of war. Such an all-embracing syllabus calls for a knowledge of air operations, backed by practical experience, in all parts of the world. Those taking part are introduced to some of the problems peculiar to cold-weather operation in high latitudes by a number of summer air exercises in the arctic regions, and by liaison flights in the winter months to Alaska and Canada.

scholarly journals Validation and Quality Assurance of Planar Chromatographic Procedures in Pharmaceutical Analysis

2001 ◽  
Vol 84 (4) ◽  
pp. 1265-1276 ◽  
Author(s):  
Katalin Ferenczi-Fodor ◽  
Zoltán Végh ◽  
Anikó Nagy-Turák ◽  
Bernd Renger ◽  
Marco Zeller
Keyword(s):  
Quality Assurance ◽  
Pharmaceutical Analysis ◽  
Control Charts ◽  
Practical Experience ◽  
Standardized Terminology ◽  
Criteria For Evaluation ◽  
Formal Requirements ◽  
Determination Of Impurities ◽  
Validation Experiments

Abstract Within the process of the International Conference on Harmonization (ICH), 2 guidelines were released containing a standardized terminology, a verified model of requirements for the validation of analytical procedures, and some guidance in the practical aspects of conducting validation studies in pharmaceutical analysis. For planar chromatographic procedures, which may be used at different levels either in qualitative identity testing, assays, semiquantitative limit tests, or quantitative determination of impurities, this paper tries to transfer these formal requirements into practical approaches for validation. Basic acceptance criteria for evaluation of validation experiments based on practical experience are proposed. In addition, selected parameters for robustness testing of given procedures and quality assurance of quantitative planar chromatographic testing by control charts is described.

scholarly journals British images of trade relations with Japan

1980 ◽  
Vol 11 (1) ◽  
pp. 21-27
Author(s):  
F. D. Marengo
Keyword(s):  
North America ◽  
Present Knowledge ◽  
Japanese Economy ◽  
Mutual Benefit ◽  
Business People ◽  
Attitudes And Practices ◽  
Trade Relations ◽  
The Usa

In view of Western interest in learning from Japan, present knowledge of, and British attitudes to, the Japanese economy are critically reviewed through an analysis of press reports in 1977 and 1978. A variety of business people, financial Journalists, politicians and other interested parties in Britain, Japan, North America and Europe are quoted on issues such as the relative inferiority/superiority between EEC countries and Japan, attitudes and practices regarding marketing, the 'mysteriousness', cunning and determination of Japanese businessmen, and on differences between Japanese trade relations with the USA, and with EEC countries. Some recommendations are made on ways in which exchange of ideas and goods could be promoted, to mutual benefit of EEC countries and Japan.In die lig van Westerse belangstelling om meer van Japan te leer, word 'n kritiese oorsig gegee van huidige kennis van, en Britse houdings teenoor, die Japannese ekonomie, deur 'n ontleding van verslae in die Britse pers in 1977 en 1978. 'n Verskeidenheid van sakemense, finansiele verslaggewers, politici en ander belanghebbendes in Brittanje, Japan, Noord-Amerika en Europa word aangehaal oor sake soos die relatiewe meerderwaardigheid/minderwaardigheid tussen EEG lande en Japan, houdings en praktyke wat betref bemarking, die 'geheimsinnigheid', geslepenheid en doelgerigtheid van Japannese sakemanne, en oor verskille tussen Japannese handelsbetrekking met die VSA, en met EEG-lande. 'n Paar aanbevelings word genoem, oor maniere waarop wisseling van idees en van goedere bevorder kan word, tot wedersydse voordeel van EEG-lande en Japan.

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