scholarly journals Steno and the rock cycle

Substantia ◽  
2021 ◽  
pp. 89-97
Author(s):  
Alan H. Cutler
Keyword(s):  
Physical Properties ◽  
19Th Century ◽  
Modern Concept ◽  
Earth System ◽  
Rock Types ◽  
The Earth ◽  
Geological Evolution ◽  
Geological Work ◽  
The 19Th Century ◽  
Geologic Processes

Geologists categorize the basic types of rock according to their origin – igneous, sedimentary, or metamorphic -- rather than by their physical properties. This is expressed dynamically by the fundamental concept of the rock cycle, which describes how the basic rock types are derived from one another within the Earth system as a result of ongoing cyclic geologic processes.  In Nicolaus Steno’s published geological work, particularly De Solido, he takes a similar approach, outlining how a substance can be examined “to disclose the place and manner of its production”. Steno also recognizes the roles of erosion, transport, and deposition in the production of sedimentary strata from pre-existing earth materials. His description and diagrams of the geological evolution of Tuscany also show a clear cyclicity of process. While the modern concept of the rock cycle did not emerge until the 19th century, Steno’s work contains key elements of this important concept.

Zum Aufstieg und Niedergang des Normalarbeitsverhältnisses in Deutschland 1800-2010 - ein Forschungsprojekt

2009 ◽  
Vol 50 (2) ◽  
Author(s):  
Toni Pierenkemper ◽  
Klaus F. Zimmermann
Keyword(s):  
Welfare State ◽  
20Th Century ◽  
19Th Century ◽  
Working Hours ◽  
Modern Concept ◽  
Employment Contract ◽  
Unemployment Rates ◽  
The Future ◽  
The 19Th Century ◽  
The Welfare State

AbstractThis paper attempts to trace the construction of the standard employment contract in Germany from the beginning of the 19th century onwards. In 20th century Germany, it was reinforced alongside with the consolidation of the welfare state and developed into the modern concept of the standard employment contract. Due to globalization forces and dynamics of capitalist market economies, the standard employment contract has turned into an obstacle in the way of modern economy’s progress. The future might be determined by increasing work flexibility, rising working hours, falling income and increasing unemployment rates, rendering the standard employment contract anachronistic and obsolete.

Struve Geodetic Arc – the Decade in the World Heritage List

2017 ◽  
Author(s):  
Saulius Urbanas ◽  
Eimuntas Kazimieras Parseliunas ◽  
Povilas Viskontas ◽  
Ruta Puziene ◽  
Arunas Buga ◽  
...  
Keyword(s):  
Arctic Ocean ◽  
19Th Century ◽  
Best Practice ◽  
World Heritage ◽  
Practice Experience ◽  
The Earth ◽  
World Heritage List ◽  
The World ◽  
Scientific Project ◽  
The 19Th Century

Unique scientific project unifying scientitsts of present modern countries: Norway, Sweden, Finland, Estonia, Latvia, Lithuania, Belarus, Ukraine, Moldova, Russia was carried out in the first half of the 19th century. Results obtained for the mentioned period were very accurate especialy considering the size of the project and instruments used for the measurements. Network of triangulation of 2820 km lenght running from Danube mouth till Arctic Ocean also called Struve Geodetic Arc was built and measured in 1816–1852. That was the longest and most accurate measured meridian arc in 19th century which measurements data were used during the century for computing and improving parameters of the Earth elipsoid. Geodetic points of Struve Geodetic Arc were listed to the World Heritage List in 2005. Three points located in Meškonys, Paliepiukai and Gireišiai were commemorated in Lithuania. The Coordinating Committee of Struve Geodetic Arc was created for colaboration, spreading information for wider public, exchange of the best practice for preservation of Struve Geodetic Arc points. Practice, experience and problems related to the World Heritage List objects preservation are presented and analyzed in this publication.

scholarly journals Measurement of geologic nitrogen using mass spectrometry, colourimetry, and a newly adapted fluorometry technique

2016 ◽  
Author(s):  
Benjamin W. Johnson ◽  
Natashia Drage ◽  
Jody Spence ◽  
Nova Hanson ◽  
Rana El-Sabaawi ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Continental Crust ◽  
Large Scale ◽  
Organic N ◽  
Stable Form ◽  
Earth System ◽  
N Budget ◽  
Rock Types ◽  
The Earth ◽  
Assess Quality

Abstract. Long viewed as a mostly noble, atmospheric species, recent work demonstrates that nitrogen in fact cycles throughout the Earth system, including the atmosphere, biosphere, oceans, and solid Earth. Despite this new-found behaviour, more thorough investigation of N in geologic materials is limited due to its low concentration (1 to 10 s ppm) and difficulty in analysis. In addition, N can exist in multiple species (NO3−, NH4+, N2, organic-N), and determining which species is actually quantified can be difficult. In rocks and minerals, NH4+ is the most stable form of N over geologic time scales. As such, techniques designed to measure NH4+ can be particularly useful. We measured a number of geochemical rock standards using three different techniques: mass spectrometry, colourimetry, and fluorometry. The fluorometry approach is a novel adaptation of a technique commonly used in biologic science, applied herein to geologic NH4+. Briefly, NH4+ can be quantified by HF-dissolution, neutralization, addition of a fluorescing reagent, and analysis on a standard fluorometer. We reproduce published values for several rock standards (BCR-2, BHVO-2, and G-2), especially if an additional distillation step is performed. While it is difficult to assess quality of each method, due to lack of international geologic N standards, fluorometry appears better suited to analyzing mineral-bound NH4+ than mass spectrometry, and is a simpler, quicker alternative to colourimetry. To demonstrate a potential application of fluorometry, we calculated a continental crust N budget based on new measurements. We used glacial tills as a proxy for upper crust and analyzed several poorly constrained rock types (volcanics, mid-crustal xenoliths) to determine that the continental crust contains ∼ 2 × 1018 kg N. This estimate is consistent with recent budget estimates, and shows that fluorometry is appropriate for large-scale questions where high sample throughput is helpful. Lastly, we report the first δ15N values of six rock standards: BCR-2 (1.05 ± 0.4 ‰), BHVO-2 (−0.3 ± 0.2 ‰), G-2 (1.23 ± 1.32 ‰), LKSD-4 (3.59 ± 0.1 ‰), Till-4 (6.33 ± 0.1 ‰), and SY-4 (2.13 ± 0.5 ‰). The need for international geologic N standards is crucial for further investigation of the Earth system N cycle, and we suggest that existing rock standards may be suited to this need.

Souterrains in Scotland

Antiquity ◽  
1953 ◽  
Vol 27 (108) ◽  
pp. 219-232 ◽  
Author(s):  
F. T. Wainwright
Keyword(s):  
20Th Century ◽  
19Th Century ◽  
The Earth ◽  
The 19Th Century

During the 19th century students of Scottish archaeology were fascinated by souterrains or earth-houses. In 1877 Joseph Anderson declared that ‘no class of structural remains has been more fully illustrated’, and his statement is supported by an abundance of papers and reports published in the first twelve volumes (1851-78) of the Proceedings of the Society of Antiquaries of Scotland. As the century drew to its close the earth-house gradually lost its hold on archaeological imagination. There were occasional papers and a few notable discoveries, but on the Whole the first half of the 20th century was a period of stagnation in this not unrewarding field. French scholars peered with organized enthusiasm into their souterrains-refuges, but in Scotland it was the close season for earth-houses. A little of the old interest has lately revived, and this may be an opportune moment to consider some of the more obvious problems that surround these curious structures.

scholarly journals Seeing the History of the Earth in the Cliffs at Møn: The Interaction between Landscape Painting and Geology in Denmark in the First Half of the 19th Century

Romantik ◽  
2013 ◽  
Vol 2 (1) ◽  
pp. 77 ◽  
Author(s):  
Gry Hedin
Keyword(s):  
Nineteenth Century ◽  
19Th Century ◽  
Landscape Painting ◽  
The Earth ◽  
Man And Nature ◽  
History Of ◽  
The 19Th Century ◽  
The Relationship ◽  
Scientific Advances ◽  
The Way

During the first part of the nineteenth century, geologists developed a history of the earth so different from that accepted in previous centuries that it encouraged a rethinking of the relationship between man and nature. In this article I will argue that painters followed these changes closely and that some of them let the narratives and images of geology inform the way they depicted nature. In arguing my point, I will focus on images and descriptions of the chalk cliffs on the Danish island of Møn by both geologists and painters. I will follow the scientific advances in geology by referring to the texts and images of Søren Abildgaard, Henrich Steffens, Johan Georg Forchhammer, and Christopher Puggaard, and discuss how their changing theories correspond with paintings of the cliffs by four artists: Christopher Wilhelm Eckersberg, Frederik Sødring, Louis Gurlitt, and Peter Christian Skovgaard.

Geodetic foundations of cartography in Europe in 19th century

2021 ◽  
Vol 977 (11) ◽  
pp. 51-64
Author(s):  
М. Lapaine
Keyword(s):  
19Th Century ◽  
Southeastern Europe ◽  
Coordinate Systems ◽  
Astronomical Observations ◽  
The Earth ◽  
Introductory Part ◽  
History Of ◽  
The 19Th Century ◽  
Geodetic Surveying

Geodetic surveying comprises the determination of locations on and the dimensions of the earth’s surface at a various scales. In the 19th century, its technologies are those of direct measurement of the earth’s surface combined with astronomical observations. Its social context encompasses all those individuals and institutions involved in the creation, preservation, use, and arrangement of knowledge of the earth. In the introductory part of the paper the author mentions several important events in the history of the 19th century geodesy. Geodetic work on determining the size of the Earth by measuring the lengths of the meridian arcs continues in this century. An international surveying organization was established and the international meter convention adopted. Basing on a detailed research of geodetic surveying in Central, Eastern and Southeastern Europe in the 19th century, a part of these surveys is presented that relates to Switzerland, Austro-Hungarian Monarchy, Austria, Hungary, Slovenia and Croatia. Common to all these geodetic surveys is that they were necessary for the development of cartography and were carried out by military institutions. The developed geodetic networks are characterized by the use of different ellipsoids, different prime meridians, different coordinate systems and their origin. In the area under consideration in the 19th century, there were five different ellipsoids in use suggested by Bessel, Bonenberger, Schmidt, Valbeck and Zach. Prime meridians were

On the development and use of appearance/attribute adverbs in English

Diachronica ◽  
2007 ◽  
Vol 24 (2) ◽  
pp. 327-371 ◽  
Author(s):  
Kristin Killie
Keyword(s):  
Physical Properties ◽  
19Th Century ◽  
Argument Structure ◽  
English Language ◽  
Positional Distribution ◽  
Conditioning Factors ◽  
The 19Th Century

It is commonly claimed that in English adjectives denoting colour and other physical properties, referred to here as ‘appearance/attribute’ adjectives, do not give rise to adverbs. This alleged constraint has been related to the fact that the adjectives in question are stative. In this paper I present data which show that appearance/attribute adjectives do give rise to adverbs. To be sure, such ‘appearance/attribute adverbs’ are infrequent and ‘literary’, but they began to be used to some extent in the 19th century, and their frequency has increased considerably during the last two centuries. In fact, in contexts where both adjectives and adverbs are allowed, i.e. in collocation with verbs that do not subcategorize for an adjective or adverb, adverbs have become more frequent than adjectives. This paper discusses what brought about this change, arguing that the crucial mechanism is analogy, and that conditioning factors are the argument structure of the relevant adverbs, the dynamicity of the collocating verb, positional distribution, creativity, and the existence of the same adverb forms with metaphorical meanings. I also argue that the development of appearance/attribute adverbs must be seen in relation to the so called ‘adverbialization process’ which has been sweeping the English language for at least a millennium.

scholarly journals The development of the dementia concept in 19th century

2014 ◽  
Vol 72 (7) ◽  
pp. 564-567 ◽  
Author(s):  
Leonardo Caixeta ◽  
Jean Newton Lima Costa ◽  
Ana Caroline Marques Vilela ◽  
Magno da Nóbrega
Keyword(s):  
19Th Century ◽  
Cognitive Dysfunction ◽  
Modern Concept ◽  
Cerebral Lesions ◽  
Clinical Marker ◽  
Human Ageing ◽  
Unique Identity ◽  
History Of ◽  
The 19Th Century

The dementia concept has been reformulated through its history and the 19th century was remarkable in the construction of this concept as we understand it today. Like other syndromes, much of the history of the dementia concept comes from the attempt to separate it from other nosological conditions, giving it a unique identity. The fundamental elements for the arising of the dementia modern concept were: a) correlation of the observed syndrome with organic-cerebral lesions; b) understanding of the irreversibility of the dementia evolution; c) its relation with human ageing; and d) the choice of the cognitive dysfunction as a clinical marker of the dementia concept.

scholarly journals Karashoky, an old wintering in the Aksary Valley in Central Kazakhstan

2020 ◽  
Vol 15 ◽  
pp. 6-25
Author(s):  
A. Z. Beisenov ◽  
◽  
N. Sh. Jumanazarov ◽  
I. K. Akhiyarov ◽  
◽  
...  
Keyword(s):  
20Th Century ◽  
19Th Century ◽  
Iron Age ◽  
Scientific Study ◽  
Early Iron Age ◽  
Preliminary Results ◽  
The Earth ◽  
The Face ◽  
State Registration ◽  
The 19Th Century

In the field seasons of 2019–2020, the authors researched the area of the Besoba village in the Karkaraly district of the Karaganda region. The locality is known for a large number of archeological monuments. The first studies of monuments were held in the 1950s by A. Kh. Margulan (Almaty), A. F. Semyonov (Karaganda), S. V. Kiselyov (Moscow). Nowadays the research is extended. New monuments of the Bronze epochs and Early Iron Age were discovered here, including the Konyrzhon petroglyphs. The mazars (tombs) and wintering camps of the Kazakh time are under research. Excavation works in the surrounding mountains show that a significant number of ancient wintering camps are concentrated in this area. The authors further examined the wintering of Karashoky. The report provides some preliminary results of the study of this monument. These works will be continued in the coming years. Based upon the results of the work, the Karashoky wintering arose in the second half of the 19th century and existed during the first decades of the 20th century. A significant part of the Kazakh winterings in Central Kazakhstan have already disappeared from the face of the earth and the rest is quickly decaying. Therefore, there is the urgency for the organization of state registration and protection of these important monuments, as well as their scientific study.

The Genesis of John Ray and his Successors

2002 ◽  
Vol 74 (2) ◽  
pp. 143-163
Author(s):  
Michael Roberts
Keyword(s):  
19Th Century ◽  
18Th Century ◽  
17Th Century ◽  
Geological Time ◽  
The Earth ◽  
John Ray ◽  
Conservative Christians ◽  
The 19Th Century ◽  
First John

Most writers assume that, until geological findings forced them to modify their beliefs in the 19th Century, all Christians believed that the earth was created in 4004 BC on the basis of Ussher’s chronological calculations. By considering first John Ray and his contemporary theologians, poets and naturalists, it is clear that few followed Ussher even in the 17th Century. They favoured a Chaos-Restitution interpretation of Genesis One allowing a longer time. Most held this in the 18th Century but after the awareness of vast geological time the duration of Chaos was vastly extended to include all geological time. This preceded the Gap Theory of Chalmers in 1802. Until the 1850s this was the dominant interpretation, when Hugh Miller and Rorison rejected it. After that most conservative Christians rejected it, but it found new life in the Scofield Bible only to be rejected after the rise of Creationism in 1961.

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