scholarly journals Les tourbières réticulées du Québec-Labrador subarctique : interprétation morphoclimatique

2005 ◽  
Vol 2 (3) ◽  
pp. 87-106 ◽  
Author(s):  
Louis-Edmond Hamelin
Keyword(s):  
Great Depth ◽  
The Other ◽  
Cold Period ◽  
Peat Bogs ◽  
Optimum Thickness ◽  
Northern Limit ◽  
Southern Limit ◽  
Geological Age ◽  
Concentric Pattern ◽  
Poor Drainage

In order to indicate the trend of his research, the author first reviews sortie books and articles that deal with similar problems. Then he carefully describes the string-bogs which are essentially a marshy zone formed of ponds separated by strips of vegetation. String-bogs present a rectilinear or a concentric pattern. Their characteristics make them different from other types of peat bogs. String-bogs are found in the Québec-Labrador peninsula inside a zone of which the Southern limit is the 50 th parallel and the Northern limit is approximately the 55 th parallel. The author's objective is to determine the morphoclimatic significance of that phenomenon. This type of string-bogs is usually found in areas of poor drainage ; it is also related to an optimum thickness of peat ; we find it jar South of the perma-frost limit in a region where snow maintains a great depth. It is a recent phenomenon though not necessarily contemporary; it dates from the cold period immediately preceding the present geological age. In order to explain the formation of string-bogs, the author envisions a combination of processes in which either one or the other can dominate locally. The processes are sub-aquatic solifluction, the gathering of isolated vegetation covered hillocks, the tearing of the plant covering by internal balls of ice, the shifting of a material as malleable as peat, the differential formation of ice in the ponds and the action of snow. These string-bogs do not form a part of « normal » geomorphology.

Comparative Surface Imaging Study of Multifocal Diffractive Intraocular Lenses

2021 ◽  
Author(s):  
Hyeck Soo Son ◽  
Jung Min Lee ◽  
Ramin Khoramnia ◽  
Chul Young Choi
Keyword(s):  
Imaging Study ◽  
The Other ◽  
Intraocular Lenses ◽  
Optical Surface ◽  
Diffractive Optic ◽  
Atomic Force ◽  
Acceptable Range ◽  
Different Types ◽  
Concentric Pattern

Abstract Purpose To analyse and compare the surface topography and roughness of three different types of diffractive multifocal IOLs. Methods Using scanning electron microscope (SEM, Inspect F, 5.0 KV, maximum magnification up to 20,000) and atomic force microscope (AFM, Park Systems, XE-100, non-contact, area profile comparison, 10 × 10 µm, 40 × 40 µm), the surface quality of the following diffractive IOLs was studied: the AcrySof IQ PanOptix (Alcon, USA), the AT LARA 829MP (Carl Zeiss Meditec, Germany), and Tecnis Symfony (Johnson&Johnson Vision, USA). The measurements were made over three representative areas (central non-diffractive optic, central diffractive optic, and diffractive step) of each IOL. Roughness profile in terms of mean arithmetic roughness (Ra) and root-mean-squared roughness (Rq) values were obtained and compared statistically. Results In SEM examination, all IOLs showed a smooth optical surface without any irregularities at low magnification. At higher magnification, Tecnis Symfony showed unique highly regular, concentric, and lineate structures in the diffractive optic area which could not be seen in the other studied diffractive IOLs. The differences in the measured Ra and Rq values of the Tecnis Symfony were statistically significant compared to the other models (p < 0.05). Conclusion Various different topographical traits were observed in three diffractive multifocal IOLs. The Ra values of all studied IOLs were within an acceptable range. Tecnis Symfony showed statistically significant higher surface Ra values at both central diffractive optic and diffractive step areas. Furthermore, compared to its counterparts, Tecnis Symfony demonstrated highly ordered, concentric pattern in its diffractive surfaces.

scholarly journals The Caratacus Stone on Exmoor

1919 ◽  
Vol 9 ◽  
pp. 208-210
Author(s):  
F. A. Bruton
Keyword(s):  
The Other ◽  
Southern Limit ◽  
North West ◽  
The Hill

On the very top of Winsford Hill, the southern limit of Exmoor, more than twelve hundred feet above the sea, two roads meet at right angles, at a point called Spire Cross. One connects the ancient (some say prehistoric) bridge known as Tarr Steps, on one side of the hill, with the picturesque village of Winsford, lying deep down in the valley of the Exe, on the other. The second road runs north-west from Dulverton to Exford, and so to Porlock and Lynmouth, passing on the left Hawkcombe Head, the favourite meeting-place of the Somerset and Devon Staghounds, and the Lorna Doone country.

Le synclinal danien-eocene de La Mourotte (Var)

1962 ◽  
Vol S7-IV (1) ◽  
pp. 87-91 ◽  
Author(s):  
Fernand Touraine
Keyword(s):  
Upper Jurassic ◽  
The South ◽  
Northern Limit ◽  
Southern Limit ◽  
The North ◽  
Bird Eggs ◽  
Tectonic Study ◽  
Dinosaur Eggs

Abstract Results of a stratigraphic and tectonic study of the Mourotte syncline, Provence, France, divide the structure into three parts. The northern part is composed of Hauterivian littoral beds containing Danian dinosaur eggs. The Danian limestone-sandstone series disappears at La Neuve while the marly upper Danian beds continue to the extreme northern limit of the syncline. In the central part the Hauterivian wedges out, and toward its southern limit the substratum is entirely upper Jurassic. In the southern part, the Danian limestones are only visible on the northeast border. Bird eggs collected in the area assign the southern part of the syncline to the Thanetian. Overturning is less noticeable in the north, becoming acute toward the south where the syncline is tightly overturned.

The Meeting Room as Fieldwork Site

2021 ◽  
pp. 33-46
Author(s):  
Huib Schippers
Keyword(s):  
Cultural Practices ◽  
Great Depth ◽  
The Other ◽  
Power Structures ◽  
Critical Juncture ◽  
Academic Impact ◽  
Public Authorities ◽  
Meeting Room ◽  
Applied Ethnomusicology

While we rightly pride ourselves on great depth and nuance in working with communities as ethnomusicologists, it is harder to claim the same qualities in how many of us regard, approach, and describe power structures. With public-facing ethnomusicology on the rise, there is both room and a need for more insightful approaches to working constructively with those in power, as various forms of structures (public authorities, NGOs, funding bodies, and even businesses) are crucial in turning projects with ambitions beyond academic impact into reality, benefiting musicians, communities, and other stakeholders. This is a critical juncture that distinguishes applied ethnomusicology; in this arena, a project without a clear strategy and support is just an idea. This chapter is based on more than forty years of negotiating spaces between dreams and ambitions of musicians and communities from myriad cultures on one hand, and on the other the ideas, forces and structures that drive those that fund, support, or otherwise enable cultural practices in different countries.

"Because the Authority of My Superiors Commands": Censorship, Physics and the German Jesuits 1

1996 ◽  
Vol 1 (3) ◽  
pp. 319-354 ◽  
Author(s):  
Marcus Hellyer
Keyword(s):  
Eighteenth Century ◽  
Seventeenth Century ◽  
Case Studies ◽  
Great Depth ◽  
Actual Practice ◽  
The Other ◽  
Society Of Jesus ◽  
Extensive Range ◽  
Philosophical Questions

AbstractThe Society of Jesus established an extensive range of measures designed to ensure uniformity in natural philosophical questions. These culminated in the Ordinatio pro Studiis Superioribus of 1651. Such measures did have significant effects on the teaching and publishing of physics among the Jesuits in Germany; it was impossible for Jesuits to openly adhere to atomism, the Cartesian view of body or heliocentrism, for example. But many Jesuits did not agree with all the provisions governing censorship and attempted to mediate their implementation in several ways which this study identifies. The most important of these was the use of terms such as true, probable or false. Provided that Jesuit authors identified the orthodox opinions as true or most probable, they could discuss alternative views in great depth. The essay culminates in two case studies from Germany, one from the mid-seventeenth century, the other from the first half of the eighteenth century, which illustrate the interaction of censorship and physics in actual practice.

The Australian species of Diaptomus (Copepoda: Calanoida) and their distribution

1966 ◽  
Vol 17 (1) ◽  
pp. 123 ◽  
Author(s):  
IAE Bayly
Keyword(s):  
Northern Australia ◽  
Northern Limit ◽  
Southern Limit ◽  
Australian Species ◽  
New Localities

The species Diaptomus (Eodiaptomus) lumholtzi Sars and D. (Tropodiaptomus) australis (Kiefer) are redescribed and figured. Both species are recorded from numerous new localities in northern Australia. The southern limit of distribution of D. lumholtzi is discussed in relation to the northern limit of Boeckella. A single example of the coexistence of D. lumholtzi with Boeckella triarticulata, and three examples of coexistence of D. lumholtzi with Calamoecia are cited.

scholarly journals Beryllium and helium. I.—The helium contained in beryls of varied geological age

1933 ◽  
Vol 142 (847) ◽  
pp. 370-381 ◽  
Keyword(s):  
The Other ◽  
Helium Content ◽  
Other Hand ◽  
Geological Age ◽  
The Subject ◽  
Thorium Series

Many years ago I found that the mineral beryl (composition Al 2 Be 3 (SiO 3 ) 6 ) contains much more helium than can be accounted for by the small traces of radioactive matter of the uranium and thorium series present in it. The same ground has been partly gone over again by other workers but it cannot be said that their papers contain any further advance towards determining definitely the origin of the helium found. Recently, on reconsidering the subject, it appeared that there was one outstanding point at least which was reasonably accessible to investigation, namely the relation of helium content to the geological age of the specimen. If helium has accumulated in the mineral as the result of atomic disintegration continued through long geological periods, we should expect large helium content to be found only in beryls coming from ancient formations. If, on the other hand, it had been trapped in some way when the mineral was formed, or if its presence were due to the rapid disintegration of a comparatively short-lived parent such as radium or ionium originally present in the mineral, we should expect to find more helium in the beryls of younger formations, since the opportunities for its escape have been less.

scholarly journals Spatial Distribution of Butterflies in Accordance with Climate Change in the Korean Peninsula

2020 ◽  
Vol 12 (5) ◽  
pp. 1995 ◽  
Author(s):  
Sangdon Lee ◽  
Hyeyoung Jeon ◽  
Minkyung Kim
Keyword(s):  
Climate Change ◽  
Meteorological Data ◽  
Statistical Significance ◽  
Distribution Patterns ◽  
Forest Research ◽  
Northern Limit ◽  
Southern Limit ◽  
Local Environments ◽  
Northern Regions ◽  
Rapid Industrialization

The effects of climate change are becoming apparent in the biosphere. In the 20th century, South Korea experienced a 1.5 °C temperature increase due to rapid industrialization and urbanization. If the changes continue, it is predicted that approximately 15–37% of animal and plant species will be endangered after 2050. Because butterflies act as a good indicator for changes in the temperature, the distribution of butterflies can be used to determine their adaptability to climate patterns. Local meteorological data for the period 1938–2011 were used from the National Forest Research Institute of Korea. Local temperature data were additionally considered among the basic information, and the distribution patterns of butterflies were analyzed for both the southern and northern regions. Southern butterflies (with northern limit) tend to increase in number with significant correlation between the temperature and number of habitats (p < 0.000), while northern butterflies (with southern limit) show no statistical significance between the temperature and number of habitats, indicating their sensitivity to temperature change. This finding is in accordance with the conclusion that southern butterflies are more susceptible to climate change when adapting to local environments and expanding their original temperature range for survival, which leads to an increase in the numbers of their habitats.

ECOLOGICAL STUDY OF THE PEAT BOGS OF EASTERN NORTH AMERICA: III. NOTES ON THE BEHAVIOR OF CHAMAEDAPHNE CALYCULATA

1956 ◽  
Vol 34 (1) ◽  
pp. 197-207 ◽  
Author(s):  
Kornelius Lems
Keyword(s):  
Ecological Study ◽  
The Other ◽  
Soil Conditions ◽  
Peat Bogs ◽  
Eastern North America ◽  
Physiological Basis ◽  
Chamaedaphne Calyculata ◽  
Different Types ◽  
The One ◽  
The Relationship

This paper presents data and observations concerning Chamaedaphne calyculata (L.) Moench. (Ericaceae). The branching pattern, the longevity of different types of leaves, and features of flowering are shown to be correlated. The relationship between this complex of features and the habitat is studied, and a few speculations are advanced to explain the physiological basis for the behavior of Chamaedaphne. This study is essentially autecological, and it is hoped that it may constitute a link between the study of soil conditions and the response of plant hormones on the one hand, and phytosociological work in peat bogs on the other hand.

Progress report on the Antarctic ice sheet

Polar Record ◽  
1960 ◽  
Vol 10 (64) ◽  
pp. 3-10 ◽  
Author(s):  
G. de Q. Robin
Keyword(s):  
Sea Level ◽  
Ross Sea ◽  
Ice Sheet ◽  
Great Depth ◽  
Progress Report ◽  
The Other ◽  
The Past ◽  
History Of ◽  
Antarctic Continent ◽  
The Antarctic

The art, science and sport of conducting scientific traverses across the Antarctic continent has advanced so rapidly during the past decade that we are making considerable progress towards understanding the main characteristics of that continent and its ice mantle. Many reports of recent work are provisional, so some changes of detail in the following account may eventually prove necessary. Nevertheless, some major features are now well established, such as the great depth of the subglacial floor to the east of the Ross Sea, and the observations that show considerable sections of the rock of East Antarctica† to be above sea level. On the other hand, the past glaciological history of the continent and the state of the present mass balance of the ice sheet still need much more investigation before we can be satisfied with the answers. The continued activity in Antarctica should result in our knowledge of the continent advancing much further during the coming decade.

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