scholarly journals Geomorphological observations on Sermersôq. A contribution to the geomorphology of S. Greenland

1965 ◽  
Vol 62 ◽  
pp. 1-41
Author(s):  
O.I Soen
Keyword(s):  
Late Cretaceous ◽  
Vertical Movements ◽  
The Third ◽  
Base Level ◽  
Early Tertiary ◽  
Glacial Stage ◽  
High Level ◽  
Mountain Glaciation ◽  
Erosion Surface ◽  
Coastal Platform

On the island of Sermersôq four erosion surfaces have been recognized, which are of regional importance in S Greenland. Their development is related to three cycles of erosion, interrupted by two glacial stages. The high-level erosion surface at altitudes above 1000 m is the remnant of an old peneplane, which was formed during the oldest erosion cycle and uplifted in late Cretaceous or early Tertiary times. This uplift initiated a second erosion cycle in the course of which a main glacial stage intervened. In this glacial stage the icelevel in the main valleys (the present fjords) acted as the effective base level of erosion and this resulted in the formation of stretches of an intermediate-level erosion surface, which now occur along the main fjords at altitudes between 400 m and 650 m. An important lowering of effective base level of erosion occurred when in the subsequent interglacial stage the sea-level resumed its role as the effective base level of erosion. This event initiated a third erosion cycle in the course of which the low-level erosion surface, between 100 m and 250 m altitude, and the strandflat, a coastal platform below 50 m, were formed. The third erosion cycle was interrupted by a second glacial stage, which on Sermersôq has the localized character of a mountain glaciation; it is during this second glacial stage that the present day fretted upland morphology of central Sermersôq originated. Post-glacial vertical movements causing the emergence of the strandflat induced a rejuvenation of erosion and consequently the incision of this coastal platform and valley floors by recent rivers.

The early magmatic chronology of Fuerteventura, Canary Islands

1986 ◽  
Vol 123 (3) ◽  
pp. 287-298 ◽  
Author(s):  
M. J. Le Bas ◽  
D. C. Rex ◽  
C. J. Stillman
Keyword(s):  
Canary Islands ◽  
Late Cretaceous ◽  
Middle Miocene ◽  
Early Miocene ◽  
Volcanic History ◽  
Early Tertiary ◽  
Ring Complex ◽  
High Level

AbstractEight new K-Ar determinations are presented which, together with field relations and previous studies, are used to construct a chronology of the volcanic build-up of Fuerteventura. The earliest island-building volcanics are late Cretaceous to early Tertiary alkaline basaltic volcaniclastic sediments, and these may be correlated with the early gabbro/pyroxenite intrusions which were probably subvolcanic to the early edifice. This was followed by a carbonatitic subvolcanic complex then by two later high-level gabbro/pyroxenite plutons, the latter being early Miocene or older. The emplacement of a subsequent middle Miocene gabbro/syenite ring complex caused widespread resetting of the Ar contents of the earlier rocks, but nevertheless consideration of the mineralogy of the rocks in conjunction with the field relations enables the long volcanic history (c. 80 Ma) to be reconstructed.

scholarly journals Sheeting and exfoliation in the granites of Sermersôq, South Greenland

1965 ◽  
Vol 49 ◽  
pp. 1-40
Author(s):  
O.I Soen
Keyword(s):  
Large Scale ◽  
Early Stage ◽  
Time Interval ◽  
Short Time Interval ◽  
Rock Types ◽  
Body Forces ◽  
Glacial Stage ◽  
Rock Load ◽  
High Level ◽  
Erosion Surface

A study of sheeting structures in post-tectonic granites on the island of Sermersôq indicates that: 1) sheeting in the Precambrian granites of Sermersôq occurred mainly, if not exclusively, at the end of a second glacial stage on that island, i. e. during the Pleistocene; 2) this recent large-scale sheeting must have occurred spontaneously in a geologically speaking very short time interval; 3) there is no relation between the recent sheeting at a niveau immediately below the high-level erosion surface on Sermersôq and the removal of rock load above this surface by erosion; the latter erosion surface was formed in pre-Tertiary, Mesozoic or possibly Paleozoic times; 4) there are no relations between sheeting and primary structures in the granite; 5) the relation between sheeting and the most recent glacial geomorphological forms is very conspicuous; 6) sheeting has affected granites which were free or very poor in pre-existing open joints; the majority of all types of joints in the relevant granites were not opened before the period of spontaneous sheeting; 7) the cause of sheeting cannot be exclusively attributed to textural or compositional characteristics of the rocks; 8) sheeted granites in recently deglaciated areas may represent an early stage in the process of granite disintegration, which tends to the formation of a mature granite landscape with typical woolsacks and/or spheroidally exfoliated boulders. A review of the literature indicates that the following relations exist: a) large-scale deep sheeting, widespread exfoliation of boulders, and woolsacks are frequently associated phenomena characteristic of post-tectonic granites; the same combination of phenomena may occur in other rock types only when spatially associated with post-tectonic granite massifs; b) large-scale sheeting in granite areas is commonly preceded by regional uplift. A general inquiry into the cause and origin of sheeting and exfoliation leads to the following conclusions: Insolation, weathering, climatological conditions, textural and compositional properties of the rocks are secondary factors in causing the large-scale sheeting of rocks. Dilatation subsequent to release of pressures is the main cause of sheeting and exfoliation. However, the compressive pressures are not mainly due to overlying rock loads and the release of pressures is not exclusively or mainly due to the removal of superincumbent rock load by erosion. The inadequacy of the current "load pressures and relief of load by erosion" hypothesis is discussed especially with regard to conditions on Sermersôq. Large-scale sheeting and widespread exfoliation are related to an inherent property of post-tectonic granite massifs. Due to the mass deficiency represented by these massifs, gravitational body forces tending to raise the deficient masses above their surroundings originate, and during longer times these forces keep exerting an axial compression on the higher levels of the granites and the overlying or immediately adjoining country rocks. During epeirogenic uplift the vertically working forces are temporarily augmented by the epeirogenic forces, while subsequently the actual elevation of the area and the contemporaneous updoming of the granites tend to compensate the existing gravitational anomalies and to reduce the gravitational body forces. Thus, when regional uplift ceases or slows down temporarily, a relative decompression of the combined gravitational and epeirogenic forces occurs rapidly, which enables the rocks near the surface to exfoliate spontaneously by dilatation in a direction normal to the free surface or topography.

Der Einfluß der Inaktivitätsosteoporose auf die szintigraphische Darstellung knöcherner Verletzungen im Bereich des Handgelenks

1989 ◽  
Vol 28 (04) ◽  
pp. 124-128 ◽  
Author(s):  
J. Spitz ◽  
N. Clemenz ◽  
K. Tittel ◽  
H. Weigand
Keyword(s):  
Bone Scintigraphy ◽  
Plaster Cast ◽  
Scaphoid Bone ◽  
X Ray ◽  
The Third ◽  
High Level ◽  
Clinical Conditions ◽  
Rate Of Accumulation

In addition to its established oncological indications the sensitivity of bone scintigraphy is of steadily increasing significance in traumatology. Inactivity- induced osteoporosis plays a major role during the immobilization period in the plaster cast. In the region of the joints remodelling intensity may reach such a high level that the non-injured bone shows a higher rate of accumulation than the fracture. This process already begins between the third and fourth week of immobilization. The highest uptake is found after fracture of the scaphoid bone at the end of twelve weeks of immobilization. Control scintigraphies at intervals of several days are indicated to differentiate between various clinical conditions (pseudoarthrosis, activated osteoarthrosis, algodystrophy in case of doubtful x-ray results).

What Can Digitization Do For Formulated Product Innovation and Development

2020 ◽  
Author(s):  
James McDonagh ◽  
William Swope ◽  
Richard L. Anderson ◽  
Michael Johnston ◽  
David J. Bray
Keyword(s):  
High Performance ◽  
Quality Data ◽  
High Quality Data ◽  
Base Level ◽  
Hybrid Approaches ◽  
Digital Ecosystem ◽  
Recent Developments ◽  
Chemical Simulation ◽  
High Level ◽  
Physical And Chemical

Digitization offers significant opportunities for the formulated product industry to transform the way it works and develop new methods of business. R&D is one area of operation that is challenging to take advantage of these technologies due to its high level of domain specialisation and creativity but the benefits could be significant. Recent developments of base level technologies such as artificial intelligence (AI)/machine learning (ML), robotics and high performance computing (HPC), to name a few, present disruptive and transformative technologies which could offer new insights, discovery methods and enhanced chemical control when combined in a digital ecosystem of connectivity, distributive services and decentralisation. At the fundamental level, research in these technologies has shown that new physical and chemical insights can be gained, which in turn can augment experimental R&D approaches through physics-based chemical simulation, data driven models and hybrid approaches. In all of these cases, high quality data is required to build and validate models in addition to the skills and expertise to exploit such methods. In this article we give an overview of some of the digital technology demonstrators we have developed for formulated product R&D. We discuss the challenges in building and deploying these demonstrators.<br>

Consent

2018 ◽  
Author(s):  
Martin Krzywdzinski
Keyword(s):  
Production Systems ◽  
Employee Behavior ◽  
Labor Disputes ◽  
Performance Expectations ◽  
The Third ◽  
The Core ◽  
Core Requirements ◽  
High Level

This chapter deals with the dependent variable of the study: consent. It analyses workplace consent in Russia and China using three indicators that refer to the core requirements of the production systems in automotive companies regarding employee behavior: first, standardized work; and second, compliance with expectations in terms of flexibility, cooperation, and a commitment to improving processes. The third indicator of consent (or the lack of it) is the absence or presence of open criticism, resistance, and labor disputes. The chapter reveals significant and unexpected differences between the Chinese and Russian sites on all three indicators. While the Chinese factories exhibit (with some variance between the companies), a relatively high level of consent, the Russian plants have problems with standardized work, the acceptance of performance expectations, and to some extent with labor disputes.

The Hydraulic Operation of Lathes for the Production of Shells

1944 ◽  
Vol 151 (1) ◽  
pp. 70-86
Author(s):  
W. Littlejohn Philip
Keyword(s):  
Machine Tools ◽  
Hydraulic Power ◽  
The Third ◽  
Hydraulic Machine ◽  
Hydraulic Machinery ◽  
Simple Machines ◽  
High Level ◽  
Shell Production ◽  
Hydraulic Operation ◽  
Made In

The paper is limited to the application of hydraulic power to lathes designed for shell making although, in the author's opinion, there is an immense field for the application of the same principles in other directions. Self-contained hydraulic machine tools have been dealt with by Mr. H. C. Town,† but in the system to be described all the machines are operated from a central hydraulic plant. Three complete installations on this principle have been established by the author, and the present paper contains an account of this work from the first experiments in 1915 until about four years ago. The first plant was constructed in 1915 for the production of 3·29-inch shells, known as “18-pounders”, from the solid bar. The output was 2,000 shells per week of 135 hours, with girl operators working on three shifts. The second plant was put down in 1916–17 for an output of 500 9·2-inch howitzer shells per week of 135 hours, also with girls working on three shifts. The third plant is of recent design. It was started in 1938 for the production of 3·45-inch shells, known as “25-pounders”; and was laid out for an output of 1,000 shells per week of 47 hours. This plant included four types of hydraulic lathes which the author was engaged to design for the War Office. Soon after the commencement of the last war in 1914 it became evident that shell production would have to be greatly increased, and engineering firms were pressed to take up shell manufacture. The author, on behalf of his firm, undertook to help in the movement, and he at once set about the construction of some simple machines for the job. These conformed on general lines to the practice of the period as regards design and operation. He soon realized, however, that drastic changes would have to be made if production was to reach the high level that circumstances demanded. Although quite familiar with hydraulic machinery of various types and of many applications in presses and certain types of heavy tools, he was not aware of any instance in which hydraulic power had been applied to the movements of a lathe. It appeared to him, nevertheless, that it would be possible to construct a very useful machine on these lines, and he accordingly started immediately to carry out experiments and to prepare designs. It was considered essential that machines for the duty which the author had in mind should be much heavier and more rigid than the ordinary machines of the time, so that they should be free from vibration and “chatter” or spring with the heaviest possible cutting. The standard of rigidity aimed at was that which would permit a half-crown coin to remain balanced on edge on the moving saddle or turret while the tools were making the heaviest cuts. This object was achieved, and the demonstration was frequently made in the presence of those who came to see the lathes at work.

Rediscovery of Choroterpes atramentum in Costa Rica, type species of Tikuna new genus (Ephemeroptera: Leptophlebiidae: Atalophlebiinae), and its role in the "Great American Inter-change"

Zootaxa ◽  
2005 ◽  
Vol 932 (1) ◽  
pp. 1 ◽  
Author(s):  
HARRY M. SAVAGE ◽  
R. WILLS FLOWERS ◽  
WENDY PORRAS V.
Keyword(s):  
Costa Rica ◽  
Central America ◽  
Late Cretaceous ◽  
Type Species ◽  
New Genus ◽  
South American ◽  
Early Tertiary ◽  
Geological Formation

A new genus, Tikuna, is described based on recent collections of adults and nymphs of Choroterpes atramentum Traver from western Costa Rica. All recent collections are from streams on or near the Nicoya Complex, the oldest geological formation in Lower Central America. Tikuna belongs to a lineage of South American Atalophlebiinae (Leptophlebiidae: Ephemeroptera) whose origin is hypothesized to have been in the late Cretaceous–early Tertiary. Some implications of the distribution of Tikuna for theories on the origin of Costa Rica’s biota are discussed.

scholarly journals The risk of venous thromboembolism and physical activity level, especially high level: a systematic review

2021 ◽  
Author(s):  
H. Danin-Mankowitz ◽  
A. Ugarph-Morawski ◽  
F. Braunschweig ◽  
P. Wändell
Keyword(s):  
Physical Activity ◽  
Systematic Review ◽  
Venous Thromboembolism ◽  
Activity Level ◽  
Case Control Studies ◽  
The Third ◽  
Area Of Interest ◽  
High Level ◽  
The Relationship

AbstractVenous thromboembolism (VTE) is the third most common cause of cardiovascular disease. Connection between high level of physical activity (PA) and the onset of VTE is unknown. We searched the literature on the possible association between PA level, especially high levels, and the risk of VTE. A systematic review was carried out to identify relevant articles on the relation between PA level and VTE. The initial search was conducted together with the Karolinska Institutet University Library in February 2018, with follow-up searches after that. In total, 4383 records were found and then screened for exclusion of duplicates and articles outside the area of interest. In total, 16 articles with data on 3 or more levels of PA were included. Of these, 12 were cohort and 4 were case-control studies. Totally 13 studies aimed at investigating VTE cases primarily, while three studies had other primary outcomes. Of the 16 studies, five found a U-shaped association between PA level and VTE risk, although non-significant in three of them. Two articles described an association between a more intense physical activity and a higher risk of VTE, which was significant in one. Nine studies found associations between increasing PA levels and a decreasing VTE risk. Available literature provides diverging results as to the association between high levels of PA and the risk of venous thromboembolism, but with several studies showing an association. Further research is warranted to clarify the relationship between high level PA and VTE.

Mutations Causing Constitutive Invertase Synthesis in Yeast: Genetic Interactions with snf Mutations

Genetics ◽  
1987 ◽  
Vol 115 (2) ◽  
pp. 247-253
Author(s):  
Lenore Neigeborn ◽  
Marian Carlson
Keyword(s):  
Regulatory Region ◽  
Constitutive Expression ◽  
Genetic Interactions ◽  
The Third ◽  
Recessive Mutations ◽  
Constitutive Mutation ◽  
Complementation Groups ◽  
High Level ◽  
Yeast Genetic ◽  
Very High

ABSTRACT We have selected 210 mutants able to grow on sucrose in the presence of 2-deoxyglucose. We identified recessive mutations in three major complementation groups that cause constitutive (glucose-insensitive) secreted invertase synthesis. Two groups comprise alleles of the previously identified HXK2 and REG1 genes, and the third group was designated cid1 (constitutive invertase derepression). The effect of cid1 on SUC2 expression is mediated by the SUC2 upstream regulatory region, as judged by the constitutive expression of a SUC2-LEU2-lacZ fusion in which the LEU2 promoter is under control of SUC2 upstream sequences. A cid1 mutation also causes glucose-insensitive expression of maltase. The previously isolated constitutive mutation ssn6 is epistatic to cid1, reg1 and hxk2 for very high level constitutive invertase expression. Mutations in SNF genes that prevent derepression of invertase are epistatic to cid1, reg1 and hxk2; we have previously shown that ssn6 has different epistasis relationships with snf mutations. The constitutive mutation tup1 was found to resemble ssn6 in its genetic interactions with snf mutations. These findings suggest that CID1, REG1 and HXK2 are functionally distinct from SSN6 and TUP1.

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