The Multi-Scale Layering-Structure of Thermal Microscale Profiles

Thermal microstructure profiling is an established technique for investigating turbulent mixing and stratification in lakes and oceans. However, it provides only quasi-instantaneous, 1-D snapshots. Other approaches to measuring these phenomena exist, but each has logistic and/or quality weaknesses. Hence, turbulent mixing and stratification processes remain greatly under-sampled. This paper contributes to addressing this problem by presenting a novel analysis of thermal microstructure profiles, focusing on their multi-scale stratification structure. Profiles taken in two small lakes using a Self-Contained Automated Micro-Profiler (SCAMP) were analysed. For each profile, buoyancy frequency (N), Thorpe scales (LT), and the coefficient of vertical turbulent diffusivity (KZ) were determined. To characterize the multi-scale stratification, profiles of d2T/dz2 at a spectrum of scales were calculated and the number of turning points in them counted. Plotting these counts against the scale gave pseudo-spectra, which were characterized by the index D of their power law regression lines. Scale-dependent correlations of D with N, LT and KZ were found, and suggest that this approach may be useful for providing alternative estimates of the efficiency of turbulent mixing and measures of longer-term averages of KZ than current methods provide. Testing these potential uses will require comparison of field measurements of D with time-integrated KZ values and numerical simulations.

Hamiltonian Aspects of Three-Layer Stratified Fluids

The theory of three-layer density-stratified ideal fluids is examined with a view toward its generalization to the n-layer case. The focus is on structural properties, especially for the case of a rigid upper lid constraint. We show that the long-wave dispersionless limit is a system of quasi-linear equations that do not admit Riemann invariants. We equip the layer-averaged one-dimensional model with a natural Hamiltonian structure, obtained with a suitable reduction process from the continuous density stratification structure of the full two-dimensional equations proposed by Benjamin. For a laterally unbounded fluid between horizontal rigid boundaries, the paradox about the non-conservation of horizontal total momentum is revisited, and it is shown that the pressure imbalances causing it can be intensified by three-layer setups with respect to their two-layer counterparts. The generator of the x-translational symmetry in the n-layer setup is also identified by the appropriate Hamiltonian formalism. The Boussinesq limit and a family of special solutions recently introduced by de Melo Viríssimo and Milewski are also discussed.

The Structural Dilemma of Citizen Participation: The Interactive Influence of Social Status and Subjective Social Mobility

In the context of rapid social change, the perception of social stratification has far-reaching and complex influences on human psychology and behavior, including citizen participation. The current research explored the interactive influence of social status and subjective social mobility on citizen participation. Two studies used experimental methods to manipulate subjective social mobility and social status, respectively, to examine the interactive effect. Taken together, the results of both studies revealed that the interaction between social status and subjective social mobility had a significant influence on citizen participation: whereas citizen participation with high social status was not affected by subjective social mobility, citizen participation with low social status decreased with increases in subjective social mobility. This research established a combined dynamic and static analysis framework of social stratification structure, elucidating the current status of citizen participation under the influence of the interaction between social status and subjective social mobility, and providing a countermeasure reference for effectively promoting citizen participation.

Evolution of microstructure and texture of ultra-thin non-oriented electrical steel manufactured by CSP

The evolution of the microstructure and texture of CSP thin-gauge non-oriented silicon steel was investigated by OM, XRD and EBSD. Results show: (1) the equiaxed surface grains with 28.13 µm average grains size accounted for 19.14% of through-thickness, while deformed band structure dominated the center layer and the other maintained at a composite structure with the first two. With the cold-rolled reduction rate enhancing to 91.15%, the stratification structure transformed into a complete fibrous structure. Annealing from 925 °C to 975 °C, the average grain size of the annealing plate similarly increased, which begins with 67.3 µm and ends at 80.58 µm. (2) The texture of the hot-rolled sheets mainly located at Cube and Goss texture, while with the cold-rolled process executing, the type and volume of texture change and finally stabilize at α fiber texture ({110}//RD) with the peak at {114}<110> at 91.15% reductions rate. The {411}<148> texture on the α* fiber line throughout maintained the strongest texture at different annealing temperatures. (3) The initial re-crystallization temperature is in the range of 600–620 °C, and the re-crystallization is roughly completed at 700 °C. Part of {411}<148> oriented grains nucleated at {411}<148> sub-grains originated from α fiber deformed structure, and the others nucleate at the grains boundaries of the deformed α fiber grains or in the inner of {111}<110> and {111}<112> grains. When the re-crystallization was accomplished at 750 °C, {411}<148> oriented grains are significantly larger than other oriented grains compared to 680 °C or the less. (4) Best magnetic properties were obtained at 975 °C with the B50 = 1.506 T and P10/400 = 16.19 W/kg.

Distinctive markers of the layer of innovators in the social-stratification structure of Russian society: sociological analysis

The sustainable development of the «knowledge-based economy» is the key factor in the growth of the country’s national welfare and the evolution of social and political spheres. For a sociologist, it is important to analyze the processes of formation of social strata of innovators in the stratification structure of society, to highlight the distinctive features of the strata of innovators and the mechanisms of its development

Occupational Gender Segregation in Turkey: The Vertical and Horizontal Dimensions

This paper investigated occupational gender segregation and its vertical and horizontal dimensions in Turkey. In order to explore the extent of inequality entailed in occupational gender segregation (measured by the vertical dimension), average pay levels across occupations were used. In addition to the economic inequalities captured by pay, aiming to explore the social inequalities inherent in occupational segregation, Cambridge Social Interaction and Stratification Scale scores across occupations were used. The results showed that the extent of inequality associated with occupational gender segregation was substantial, operating to the detriment of women. Women were more likely to be employed in lower-paid jobs and in occupations that ranked lower across the overall stratification structure, while men remained at an advantaged position in terms of both the pay levels and the positions of the occupations they held in the social hierarchy.

Relief and internal structure of the subaqueous sand dunes in the Vistula River mouth

This paper presents the results of bathymetric and seismoacoustic measurements carried out in the canal of the Vistula River mouth (pol. Przekop Wisły). The surveys were conducted with the use of a multibeam echosounder and a parametric sub-bottom profiler. It made it possible to obtain a high resolution bottom morphology measurement, and to identify and characterize an internal structure of subaqueous bedforms. Presence of multiple series of small to large dunes, with their length ranging from 5 up to 55 m and height from 0.1 up to 1.5 m, was established. They were composed mainly of poorly graded medium-grained sands. The nature of the sediment graining was relatively uniform. Significant diversity in terms of the formation sizes was observed, and itwas only loosely dependent on their depth and location within individual relief units. Collateral medium and small formations were found everywhere among the large formations. The bedforms consisted of well-developed steep cross-coset stratification structure. It has been ascertained that the cross-coset thickness of this formation was greater (or equal) than its height. The scope of this work is to identify the relief and structure of subaqueous dunes for the purpose of the assessment of flow properties and bottom conditions in both recent and palaeoenvironments. The obtained results are crucial for determining the state of the Przekop Wisły canal, indicating potential limitations to unconstrained flow of spate water and ice drifting as well as navigation conditions.

Use of e-government services in a deeply divided society: A test and an extension of the social inequality hypotheses

The issue of e-government use is critical in deeply divided societies where the access to social capital is restricted for minorities. E-government use in these societies may differ by ethnic background, size of locality or both. Israel was chosen as a case since it is an example of a deeply divided society. Using data from the Israel’s Social Survey 2015, it was found that the disadvantaged minority has a lower probability of using e-government as compared to other groups. However, when segmenting this population by size of its localities, the stratification structure differs between large and small localities. The conclusion is that the inequality approaches should consider not only the ethnicity but also the size of locality as a factor differentiating between ethnic groups in terms of the specific Internet use.

Book Reviews

Inas Kelly of Queens College, City University of New York reviews “The End Game: How Inequality Shapes Our Final Years,” by Corey M. Abramson. The Econlit abstract of this book begins: “Paperback edition of 2015 text illustrates how key mechanisms of social stratification structure everyday life in old age and how the unique practical and symbolic aspects of old age make it an important axis of American inequality.”