scholarly journals LITTORAL PROCESSES IN LAKES

2010 ◽  
Vol 1 (1) ◽  
pp. 16
Author(s):  
W. C. Krumbein
Keyword(s):  
Great Lakes ◽  
Coastal Areas ◽  
Wave Action ◽  
Point Of View ◽  
Long Period ◽  
Geological Processes ◽  
Recreational Beaches ◽  
Closed Systems ◽  
General Topic ◽  
Sea Coast

The purpose of this paper is to present the general topic of lake processes to an engineering audience from a geological point of view. It is apparent that the shores of larger lakes present many problems in common with the sea coast, but the absence of tides, and of first-rank storms, means that geological processes are less marked, and structures may in general be smaller. In contrast to many coastal areas, the Great Lakes probably have less consolidated materials in their banks and bluffs, inasmuch as the basins lie mainly in glacial deposits. Hence rates of erosion may be much greater than on harder coastal rocks. The effect of long-period changes in level also introduce problems of selecting distances above and below lake datum in structures, to allow for the more shoreward wave action during times of high levels. The much leaner shore drift along lakes as compared to the oceans also means that problems of beach development and maintenance may be more difficult to solve. Greater reliance on imported sand in closed systems seems to be the trend in some larger communities where the demand for recreational beaches is great.

The growth of mica polytypes as studied by conventional and high-resolution TEM

1983 ◽  
Vol 41 ◽  
pp. 174-177
Author(s):  
A. Baronnet ◽  
M. Amouric
Keyword(s):  
Water Pressure ◽  
Point Of View ◽  
Temperature Fields ◽  
Natural Occurrence ◽  
Growth Mechanisms ◽  
Long Period ◽  
High Resolution Tem ◽  
Layer Stacking ◽  
Experimental Works ◽  
Potential Use

The origin of mica polytypes has long been a challenging problem for crystal- lographers, mineralogists and petrologists. From the petrological point of view, interest in this field arose from the potential use of layer stacking data to furnish further informations about equilibrium and/or kinetic conditions prevailing during the crystallization of the widespread mica-bearing rocks. From the compilation of previous experimental works dealing with the occurrence domains of the various mica "polymorphs" (1Mr, 1M, 2M1, 2M2 and 3T) within water-pressure vs temperature fields, it became clear that most of these modifications should be considered as metastable for a fixed mica species. Furthermore, the natural occurrence of long-period (or complex) polytypes could not be accounted for by phase considerations. This highlighted the need of a more detailed kinetic approach of the problem and, in particular, of the role growth mechanisms of basal faces could play in this crystallographic phenomenon.

History: changing the forms or forming the changes?

2005 ◽  
Vol 13 (1) ◽  
pp. 47-66 ◽  
Author(s):  
SVEND ERIK LARSEN
Keyword(s):  
Cultural History ◽  
18Th Century ◽  
Point Of View ◽  
Future Planning ◽  
Long Period ◽  
Close Analysis ◽  
Vitruvian Man ◽  
Human Responsibility ◽  
The Individual ◽  
Individual Human

Change in European cultural history has, for a long period, been discussed through two interrelated notions, that of science and that of history. This paper traces the various stages of this discussion from Antiquity to the present day from the point of view of history. Two reoccurring and paradigmatic characters of mythological descent, Odysseus and Prometheus, illustrate how history as a realm for human responsibility and future planning has established itself as a specific European construct, with the 18th century as its final breakthrough in practical and ideological terms. A close analysis of Leonardo da Vinci's drawing the Vitruvian Man, in statu nascendi, shows how the individual human being carrying the obligations and the promises of this history, is envisioned. The final remarks underline the importance of scientific knowledge in the concrete shaping of this responsibility and a plea for an increased cooperation across the disciplines.

scholarly journals HARBOR STUDY FOR SAN NICOLAS BAY, PERU

1970 ◽  
Vol 1 (12) ◽  
pp. 133
Author(s):  
James M. Keith ◽  
Emmett J. Murphy
Keyword(s):  
Particle Velocity ◽  
Time Lapse ◽  
Wave Action ◽  
Ship Motion ◽  
Long Period ◽  
Wave Property ◽  
Directional Wave ◽  
Detailed Interpretation ◽  
Wave Phenomena ◽  
Insight Into

A pair of ducted impeller current meters, one mounted vertically and the other horizontally, were used to measure wave action at San Nicolas Harbor, Peru The horizontal water velocity records are superior to conventional wave records because they measure directly the wave property which induces adverse horizontal ship motion, and provide directional wave data Spectral analysis methods proved well-suited to detailed interpretation of the particle velocity records, while considerable insight into the wave phenomena was gained by simple, rational inspections and interpretations of the records Time-lapse movies of a moored ship, when correlated with simultaneous water particle velocity records, provided an exceptionally clear picture of ship response to wave action, and led to the rather surprising observation that long-period ship motion is not necessarily caused by long-period waves The foregoing ship response was duplicated in hydrau1ic model tests.

Apercu sur le Quaternaire de Salvador (Amerique centrale)

1961 ◽  
Vol S7-III (1) ◽  
pp. 59-68
Author(s):  
Jean Tricart
Keyword(s):  
El Salvador ◽  
Volcanic Ash ◽  
Coastal Areas ◽  
Explosive Activity ◽  
Climatic Fluctuations ◽  
Long Period ◽  
Volcanic Region ◽  
Relative Dating ◽  
Late Tertiary

Abstract El Salvador is essentially a volcanic region in which an older, presumably late Tertiary, complex of andesite and basalt flows and breccias and younger, more acid Quaternary rocks are represented. Following a long period of inactivity during which the Tertiary volcanic masses were considerably eroded, episodic explosive activity occurred in the Quaternary, accompanied by the formation of extensive calderas and ejection of considerable ash. Paleosols were developed in the intervals between explosions, which permit relative dating of the successive episodes. The last stages of activity were characterized by extrusion of mud flows, torrential gullying, and deposition of thick piedmont detrital beds accompanied by reworking of volcanic ash which was redeposited in dammed lakes and other depressions. The development of calcareous crusts in places constitutes evidence of significant climatic fluctuations. There is also evidence of differential subsidence in coastal areas.

Seaweed Consumption in the Americas

2019 ◽  
Vol 19 (4) ◽  
pp. 49-59 ◽  
Author(s):  
José Lucas Pérez-Lloréns
Keyword(s):  
Coastal Areas ◽  
Point Of View ◽  
Western World ◽  
Staple Food ◽  
Asian Countries ◽  
Seaweed Species ◽  
Avant Garde ◽  
High Side

For centuries and from Greenland to Chile, several seaweed species have been staple food for tribes inhabiting coastal areas. However, the current culinary use of seaweeds in the Americas, as well as in the Western world, is still rather anecdotal compared to that in Eastern countries. Most species are completely unexplored from the point of view of their gastronomic and nutritional potentials, since only about 150–200 species out of approximately 10,000 are commonly used in the cuisine of those Asian countries even with the longest tradition, and estimating on the high side this figure drops to just over a dozen in the Western world. In the Americas, very recently, seaweeds are being considered as part of avant-garde culinary activities or innovative gastronomy where so-called phycogastronomy is on the rise. Such culinary tendency eventually will permeate to other casual or midrange restaurants and also to home cuisine, as has already happened in Europe, contributing to the “popularization” of this wonderful and healthy marine produce.

Political Determinants of Privatisation Reforms: A Comparative Analysis in Europe

2019 ◽  
Vol 18 (2) ◽  
pp. 204-227
Author(s):  
Noemí Peña-Miguel ◽  
Beatriz Cuadrado-Ballesteros
Keyword(s):  
Comparative Analysis ◽  
Political Competition ◽  
Point Of View ◽  
Veto Players ◽  
Right Wing ◽  
Political Factors ◽  
Long Period ◽  
Political Determinants ◽  
Practical Implications

This article analyses the effect of political factors on privatisation reforms and considers the practical implications of such policy from a comparative point of view in Europe. According to a sample of 25 countries in 1995–2013, our findings suggest that privatisation reforms could be impeded by veto players, fragmentised governments and political competition. These reforms tend to be used less by politicians who have been in power for a long period of time and implemented at the start of an office term, except in the case of right-wing governments. Our findings support greater privatisation in concentrated conservative governments, especially when the next elections are about to be held.

scholarly journals IX. On the application of harmonic analysis to the dynamical theory of the tides. — Part I. On laplace’s "oscillations of the first species” and the dynamics of ocean currents

1897 ◽  
Vol 189 ◽  
pp. 201-257 ◽  
Keyword(s):  
Ab Initio ◽  
Harmonic Analysis ◽  
Dynamical Theory ◽  
Point Of View ◽  
Ocean Currents ◽  
Long Period ◽  
Dynamical Treatment ◽  
The Subject ◽  
Hydrodynamical Theory

The earliest attempt to subject the Theory of the Tides to a rigorous dynamical treatment was given by Laplace in the first and fourth books of the ‘Mécanique Céleste.’ The subject has since been treated by Airy, Kelvin, Darwin, Lamb, and other writers, but with the exception of the extension of Laplace’s results to include the theory of the long-period tides, but little practical advance has been made with the subject, in spite of the enormous increase in the power of the mathematical resources at our disposal, and the problem has remained in very much the same condition as it was left by Laplace. This arises no doubt partly from the difficulties inherent to the subject, but partly from the form in which the theory was originally presented by Laplace in the ‘Mécanique Céleste,’ which has been described by Airy as “perhaps on the whole more obscure than any other part of the same extent in that work.” The obscurity complained of does not however seem to have been entirely removed by Laplace’s successors, and it was the fact that every presentment of the theory with which I was acquainted offered some points of difficulty, that in the first instance led me to take up the problem ab initio , partly with the purpose of allaying the doubts which had arisen in my own mind as to the validity of certain approximations employed by Laplace and adopted by his successors, and partly in the hope that I might be able to extend the results of Laplace to meet more fully the case presented by the circumstances actually existent in Nature. Up to the present I have been unable to free the problem to any extent from the limitations which have been imposed by previous writers, and consequently it would be futile to claim that the results I am now able to put forward materially advance our knowledge of the tides as they actually exist; but I venture to hope that these results, as applied to the oscillations of an ideal ocean, considerably simpler in character than the actual ocean, may prove of some interest from the point of view of pure hydrodynamical theory.

In the Shadow of history: the emergence of archaeology

1999 ◽  
Vol 94 ◽  
pp. 353-367 ◽  
Author(s):  
Chryssoula Saatsoglou-Paliadeli
Keyword(s):  
Point Of View ◽  
Archaeological Research ◽  
Archaeological Material ◽  
Long Period ◽  
Direct Knowledge ◽  
A Site

This article reconsiders from a methodological point of view some of the ways in which the ancient Macedonians and their culture have been assessed by recent historians. It is inspired by Professor E. N. Borza's book on this issue, where archaeological material is widely used in ways which do not always accord with the data or their interpretation. It has to be noted that the article is focused only on the evidence deriving from Vergina, a site of which the author has a direct knowledge, due to participation in its archaeological research over a long period.

scholarly journals Light Curve Analysis of Long Period Pulsating Stars with the Wavelet Method: The semiregular star V Boo

1995 ◽  
Vol 155 ◽  
pp. 417-418 ◽  
Author(s):  
K. Szatmáry ◽  
J. Gál ◽  
L. L. Kiss
Keyword(s):  
Stellar Evolution ◽  
Curve Analysis ◽  
Point Of View ◽  
Light Curves ◽  
Data Series ◽  
Strong Fluctuation ◽  
Light Curve Analysis ◽  
Pulsating Stars ◽  
Long Period ◽  
Data Banks

AbstractWe have collected long data series of some SR and Mira stars from data banks. In many cases the light curves show strong fluctuation or variation in the period, phase and amplitude. The detection of the significant changes of these parameters is important from the point of view of pulsation theory and stellar evolution. We present here the analysis of V Boo. The used method is the Fourier and wavelet analysis in order to point out the modulations in the frequency and amplitude.

The Boom Clay geochemistry: Natural evidence

2006 ◽  
Vol 932 ◽  
Author(s):  
M. De Craen
Keyword(s):  
Pore Water ◽  
Point Of View ◽  
Water Sampling ◽  
Spent Fuel ◽  
Geochemical Composition ◽  
Boom Clay ◽  
Water Composition ◽  
Geological Processes ◽  
Long Time ◽  
High Level

ABSTRACTIn Belgium, the Boom Clay is studied as the reference formation for geological disposal of high-level radioactive waste and spent fuel. As the Boom Clay is considered as the main barrier for radionuclide migration/retention, a thorough characterisation of the clay and its pore water was done. This facilitates better understanding of the long-term geological processes and the distribution of the trace elements and radionuclides.From a mineralogical/geochemical point of view, the Boom Clay is considered as a rather homogeneous sediment, vertically as well as laterally. It is composed of detrital minerals, organic matter and fossils. Minerals are mainly clay minerals, quartz and feldspars. Minor amounts of pyrite and carbonates are also present. Small variations in mineralogical/geochemical composition are related to granulometrical variations. The radiochemical study indicates that the Boom Clay is in a state of secular radioactive equilibrium, meaning that the Boom Clay has not been disturbed for a very long time.Pore water sampling is done in situ from various piezometers, or by the squeezing or leaching of clay cores in the laboratory. These three pore water sampling techniques have been compared and evaluated. Boom Clay pore water is a NaHCO3 solution of 15 mM, containing 115 mg·1−1 of dissolved natural organic carbon. Some slight variations in pore water composition have been observed and can be explained by principles of chemical equilibrium.

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