scholarly journals Marginal Instability and the Efficiency of Ocean Mixing

2020 ◽  
Vol 50 (8) ◽  
pp. 2141-2150
Author(s):  
W. D. Smyth
Keyword(s):  
Shear Flows ◽  
Mixing Efficiency ◽  
Empirical Knowledge ◽  
Stratified Turbulence ◽  
Physical Explanation ◽  
Uniform Value ◽  
Considerable Controversy ◽  
The Subject ◽  
Geophysical Fluids ◽  
Simple Picture

AbstractThe mixing efficiency of stratified turbulence in geophysical fluids has been the subject of considerable controversy. A simple parameterization, devised decades ago when empirical knowledge was scarce, has held up remarkably well. The parameterization rests on the assumption that the flux coefficient Γ has the uniform value 0.2. This note provides a physical explanation for Γ = 0.2 in terms of the “marginal instability” property of forced stratified shear flows, and also sketches a path toward improving on that simple picture by examining cases where it fails.

Scaling the Mixing Efficiency of Sediment-stratified Turbulence

2022 ◽  
Author(s):  
Junbiao Tu ◽  
Daidu Fan ◽  
Zhiyu Liu ◽  
William Smyth
Keyword(s):  
Mixing Efficiency ◽  
Stratified Turbulence

14. Invasion of privacy

2019 ◽  
pp. 346-379
Author(s):  
Kirsty Horsey ◽  
Erika Rackley
Keyword(s):  
Human Rights ◽  
Personal Information ◽  
Common Law ◽  
European Convention ◽  
Invasion Of Privacy ◽  
Human Rights Act ◽  
Human Rights Act 1998 ◽  
Considerable Controversy ◽  
The Subject ◽  
Reasonable Expectation Of Privacy

This chapter discusses different aspects of privacy. It shows that there is no general common law right to protection from invasion of privacy (the so-called ‘right to be let alone’), but that limitation has been largely subverted by the new law in the second section on the protection of personal information and the reasonable expectation of privacy that has developed significantly in recent years. This shows the potential power of the Human Rights Act 1998 and the European Convention on Human Rights, and is the subject of considerable controversy, especially in relation to the protection of celebrity privacy. The final section considers remedies in privacy cases.

scholarly journals The Role of Debris-Rich Ice in Flow Near the Margins of Glaciers (Abstract)

1986 ◽  
Vol 8 ◽  
pp. 201 ◽  
Author(s):  
R.W. Baker
Keyword(s):  
Shear Plane ◽  
Conveyor Belt ◽  
Physical Geography ◽  
Supporting Evidence ◽  
Ice Caps ◽  
Considerable Controversy ◽  
Flow And Sediment Transport ◽  
The Subject ◽  
Shear Planes

The margins of many ice sheets and ice caps are marked by the presence of alternating layers of debris-laden and clean ice. The role of this ice in flow and sediment transport near the margins of glaciers has been the subject of considerable controversy between glacial geologists and glaciologists for over three decades. Glacial geologists (Goldthwait, 1951, 1960, 1971, 1975; Bishop, 1957; Souchez, 1967, Boulton, 1970, 1972; Hambrey, 1976) commonly refer to the debris-bearing ice bands as “thrust planes” or “shear planes”, apparently seeing them as reverse faults which transport rock debris from the glacier bed to the surface in a “conveyor-belt-like” manner (Goldthwait, 1975, p. 192). As supporting evidence for the shear-plane mechanism, glacial geologists have offered only qualitative observations and none seem to have actually observed it in action. Glaciologists on the other hand, particularly Weertman (1961), Hooke (1968; 1973), and Hooke and Hudleston (1978), have objected to this concept on physical grounds and have presented convincing arguments for doubting that it is mechanically sound. In spite of the controversy surrounding it, the shear-plane mechanism has gained wide acceptance among geologists and physical geographers and has been perpetuated in recent years through a number of popular introductory geology and physical geography textbooks (e.g. Embleton and King, 1975; Judson, Deffeyes, and Hargraves, 1976; Leet, Judson, and Kauffman, 1978; Press and Siever, 1982; Hamblin; 1982).

scholarly journals Preliminary Orbits from Velocities with the CCD-Echelle Spectrometer at Lick

1992 ◽  
Vol 135 ◽  
pp. 170-172
Author(s):  
Daniel M. Popper
Keyword(s):  
Cross Correlation ◽  
Binary Star ◽  
Center Of Mass ◽  
Progress Report ◽  
Eclipsing Binaries ◽  
High Signal ◽  
Large Magnitude ◽  
Considerable Controversy ◽  
The Subject ◽  
Echelle Spectrometer

The Hamilton CCD-echelle spectrometer at the coudé focus of the 3-m Shane telescope of the Lick observatory has been described by Vogt (1987). Illustrations of some binary star spectra obtained with this instrument are given by Popper & Nelson (1990, B-type binaries with large magnitude differences) and by Popper (1992, G-type eclipsing binaries), where typical cross-correlation functions are also shown.In this progress report, I give some initial preliminary orbital results. First is the bright early B binary, VV Ori, the orbits of which have been the subject of considerable controversy (Duerbeck 1975, Andersen 1976, Popper 1981). According to Chambliss & Leung (1982) and to the line ratios, the secondary component contributes about 10% of the light of the system in the visual region. Multiple (2 to 4) exposures of VV Ori have been obtained with the Hamilton on 7 nights. Velocities of the primary are determined from 13 lines, primarily of OII and HeI between 440 and 590 nm. The only lines found to be useful for the secondary are HeI 597.5 and 492.1. Analysis of the velocities is complicated by the poorly determined variation of the center-of-mass velocity, with a range of roughly 26 km s−1 and a period of roughly 120 days (e.g., Duerbeck 1975). Preliminary orbits based on this material lead to masses 11.1 and 4.7.M⊙, to be compared to Duerbeck’s values of 7.7 and 3.4. It is primarily the high signal/noise ratio, over 600, that enables this study to be carried out satisfactorily.

scholarly journals SecA Dimer Cross-Linked at Its Subunit Interface Is Functional for Protein Translocation

2006 ◽  
Vol 188 (1) ◽  
pp. 335-338 ◽  
Author(s):  
Lucia B. Jilaveanu ◽  
Donald Oliver
Keyword(s):  
Conformational Changes ◽  
Protein Transport ◽  
Protein Translocation ◽  
Directed Mutagenesis ◽  
Subunit Interface ◽  
Cargo Proteins ◽  
Considerable Controversy ◽  
The Subject ◽  
Vitro Protein

ABSTRACT SecA facilitates protein transport across the eubacterial plasma membrane by its association with cargo proteins and the SecYEG translocon, followed by ATP-driven conformational changes that promote protein translocation in a stepwise manner. Whether SecA functions as a monomer or a dimer during this process has been the subject of considerable controversy. Here we utilize cysteine-directed mutagenesis along with the crystal structure of the SecA dimer to create a cross-linked dimer at its subunit interface, which was normally active for in vitro protein translocation.

Cyzicus

1902 ◽  
Vol 22 ◽  
pp. 174-189 ◽  
Author(s):  
Robert de Rustafjaell
Keyword(s):  
Asia Minor ◽  
Good Fortune ◽  
Ancient City ◽  
Considerable Controversy ◽  
The Subject ◽  
The City

Whilst travelling in Asia Minor in 1900 I paid a cursory visit to the peninsula of Cyzicus on the Propontis, in ancient Mysia, and had the opportunity of examining the site of the ancient city, and the canal that has been the subject of considerable controversy in bygone ages, and about which the facts are still only partly ascertained. As the site appeared to promise results of peculiar interest, I applied for a concession to excavate it. I had the good fortune to obtain an Imperial Iradé in February, and began tentative operations in May.From the Admiralty Chart it will be seen that Cyzicus lies on the 30° long. east of Greenwich, and 40°22′ N. lat. and within easy reach of Constantinople. To Panderma there is practically a daily service of steamers, which leave Constantinople at sunset and arrive at about four o'clock the next morning. At Panderma a sailing-skiff takes one in about an hour across the bay to Yeni-Keui, the landing stage immediately outside the walls of the city.

Quality attributes of Jericoacoara, Brazil

2017 ◽  
Vol 3 (2) ◽  
pp. 196-204 ◽  
Author(s):  
Sara Joana Gadotti dos Anjos ◽  
Jéssica Vieira de Souza Meira ◽  
Melise de Lima Pereira ◽  
Pablo Flôres Limberger
Keyword(s):  
Factor Analysis ◽  
Design Methodology ◽  
Quality Attributes ◽  
Management Tool ◽  
Empirical Knowledge ◽  
Content Type ◽  
Confirmatory Factor ◽  
The Subject ◽  
Empirical Contribution

Purpose Some recent research studies in tourism have focused on the quality of the destination. The purpose of this paper is to identify and test the quality attributes of the destination of Jericoacoara, Brazil, in order to contribute to theoretical and empirical knowledge of the subject. Design/methodology/approach This study is exploratory and descriptive in nature, with a quantitative approach, and uses questionnaires administered to 391 tourists in Jericoacoara. Data were analyzed through exploratory factor analysis and confirmatory factor analysis. Findings Results showed that the most important factor in assessing the quality of the destination is service, followed by the factors accommodation, management, destination, and, lastly, attractions. Originality/value This study is a theoretical and empirical contribution to the debate on destiny quality and a management tool for strategic planning.

On the Life-History of Heterakis gallinœ

1933 ◽  
Vol 11 (2) ◽  
pp. 67-86 ◽  
Author(s):  
Phyllis A. Clapham
Keyword(s):  
Life History ◽  
History Of ◽  
Considerable Controversy ◽  
The Subject ◽  
Nematode Worm

During the course of some experiments involving the Nematode worm Heterakis gallinæ, it became necessary to know the exact life history in order to interpret the results. On consulting the literature it became evident that the details of the life history had never been worked out accurately in either this worm or in any of its near relations. Further-more, there was considerable controversy on the subject. For this reason therefore the whole morphology and life history were investigated in detail and some interesting points came to light.

The Tax Censuses and the Decline of the Serf Population in Imperial Russia, 1833-1858

Slavic Review ◽  
1979 ◽  
Vol 38 (3) ◽  
pp. 403-425 ◽  
Author(s):  
Steven L. Hoch ◽  
Wilson R. Augustine
Keyword(s):  
Death Rate ◽  
Birth Rate ◽  
Population Data ◽  
One Dimension ◽  
Demographic Development ◽  
Imperial Russia ◽  
System A ◽  
Considerable Controversy ◽  
Western Scholar ◽  
The Subject

The demographic development of the serf population in imperial Russia, particularly its rate of natural growth during the thirty years preceding the emancipation in 1861, has been the subject of considerable controversy. On the basis of data from the tax censuses (revizii), abolitionists sontended that the serf population was dying out, implying that the death rate consistently exceeded the birth rate. Many Soviet historians and demographers have subsequently advanced this view, seeing a demographic crisis as one dimension of the collapse of the feudal serf system. A Western scholar, Professor Daniel Field, has recently lent his support to this interpretation. But was serfdom so socially oppressive or economically stifling as to affect natural population growth adversely? Other contemporary statisticians and later historians—either less opposed to serfdom or more skeptical about the accuracy of population data—have avoided the issue.

scholarly journals Perception of residents in relation to Arborization in the municipality of Ibateguara, Alagoas, Brazil

2020 ◽  
Vol 5 (3) ◽  
pp. 1477-1485
Author(s):  
Maria José de Holanda Leite ◽  
Thamyres Valeriano Teixeira ◽  
Arrysson Cardoso da Silva ◽  
Cosme Ângelo da Silva
Keyword(s):  
Quality Of Life ◽  
Environmental Education ◽  
Urban Environments ◽  
Air Purification ◽  
Empirical Knowledge ◽  
Adequate Knowledge ◽  
The Subject ◽  
Structured Questionnaire ◽  
Solar Rays

The improvement of quality of life in urban environments can occur through afforestation, which contributes to air purification, improvement of the city's climate by retaining soil and air moisture, by generating shadow, preventing solar rays from affecting directly on people. The aim of this research was to evaluate the positive and negative environmental impacts of urban arborization through the report of residents of the municipality of Ibateguara-AL. Thus, a semi-structured questionnaire was applied with fifteen questions about Arborization, Totaling 50 completed questionnaires. Through the results obtained, it was possible to observe that the residents, have empirical knowledge on the subject, where arborization is associated only with trees and shade, yet do not possess adequate knowledge about all the benefits of afforestation For its maintenance. These data reinforce the need for planning the afforestation of the municipality, with the implementation of an environmental education project, seeking to raise awareness of the population of its importance.

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