scholarly journals The suspension of solids in a turbulent stream

A considerable amount of research has been done recently on the mechanism by which grains of sand, etc., may be picked up by a river or by a gale of wind and carried to some distance. In particular Jeffreys (1929) has considered the theoretical aspects of the action while the writer (1934) and Bagnold (1936) have published experimental data on the action by which the grains are picked up in water and air respectively. Another problem of considerable practical importance is th a t of the quantity—or, more strictly, the time average of the quantity—of solid material carried at different levels above the bed or ground. Up to the present, data on this question have all been collected in relation to a special case, i. e. that in which the particles have the same size and density. Thus, Hurst (1929) collected samples of uniformly graded sand at different depths in a turbo-cylinder containing a vigorously stirred mixture of sieved sand in water, and showed that, in the body of the cylinder, an exponential relation between “weight” of sample and height above the bottom of the vessel existed. The present paper is mainly concerned with measurements of the concentration of the suspended material near the uniformly graded bed of an artificial channel and the application of these results to the conditions in a natural stream.

Author(s):  
Sona N. Golder ◽  
Ignacio Lago ◽  
André Blais ◽  
Elisabeth Gidengil ◽  
Thomas Gschwend

Voters face different incentives to turn out to vote in one electoral arena versus another. Although turnout is lowest in European elections, it is found that the turnout is only slightly lower in regional than in national elections. Standard accounts suggest that the importance of an election, in terms of the policy-making power of the body to be elected, drives variation in turnout across elections at different levels. This chapter argues that this is only part of the story, and that voter attachment to a particular level also matters. Not all voters feel connected to each electoral arena in the same way. Although for some, their identity and the issues they most care about are linked to politics at the national level, for others, the regional or European level may offer the political community and political issues that most resonate with them.


2021 ◽  
Vol 7 (s4) ◽  
Author(s):  
Darren James Reed

Abstract In various ways the movement and experience of the body is instructed by others. This may be in the dance class or on the playing field. In these interactions, one person claims knowledge of the other’s body and rights to instruct how that body functions, moves, and feels. By undertaking a close analysis of embodied and spoken interaction within performance training sessions from a multimodal conversation analytic perspective, this paper will identify one kind of broad sequential trajectory – from intimate contact to public display - that shows how an instructor claims rights over the internal workings of another’s body by traversing different levels of proximity and sensorial modalities.


2021 ◽  
pp. 1354067X2110040
Author(s):  
Josefine Dilling ◽  
Anders Petersen

In this article, we argue that certain behaviour connected to the attempt to attain contemporary female body ideals in Denmark can be understood as an act of achievement and, thus, as an embodiment of the culture of achievement, as it is characterised in Præstationssamfundet, written by the Danish sociologist Anders Petersen (2016) Hans Reitzels Forlag . Arguing from cultural psychological and sociological standpoints, this article examines how the human body functions as a mediational tool in different ways from which the individual communicates both moral and aesthetic sociocultural ideals and values. Complex processes of embodiment, we argue, can be described with different levels of internalisation, externalisation and materialisation, where the body functions as a central mediator. Analysing the findings from a qualitative experimental study on contemporary body ideals carried out by the Danish psychologists Josefine Dilling and Maja Trillingsgaard, this article seeks to anchor such theoretical claims in central empirical findings. The main conclusions from the study are used to structure the article and build arguments on how expectations and ideals expressed in an achievement society become embodied.


Author(s):  
Lin Sun ◽  
Sanjay R. Mathur ◽  
Jayathi Y. Murthy

A numerical method is developed for solving the 3D, unsteady, incompressible flows with immersed moving solids of arbitrary geometrical complexity. A co-located (non-staggered) finite volume method is employed to solve the Navier-Stokes governing equations for flow region using arbitrary convex polyhedral meshes. The solid region is represented by a set of material points with known position and velocity. Faces in the flow region located in the immediate vicinity of the solid body are marked as immersed boundary (IB) faces. At every instant in time, the influence of the body on the flow is accounted for by reconstructing implicitly the velocity the IB faces from a stencil of fluid cells and solid material points. Specific numerical issues related to the non-staggered formulation are addressed, including the specification of face mass fluxes, and corrections to the continuity equation to ensure overall mass balance. Incorporation of this immersed boundary technique within the framework of the SIMPLE algorithm is described. Canonical test cases of laminar flow around stationary and moving spheres and cylinders are used to verify the implementation. Mesh convergence tests are carried out. The simulation results are shown to agree well with experiments for the case of micro-cantilevers vibrating in a viscous fluid.


2021 ◽  
Vol 18 (1) ◽  
pp. 62-71
Author(s):  
O. I. Zaynitdinov ◽  

Objective: Selection of technical solutions for designing a covered detachable body fence with sliding side walls and a roof. Methods: A detachable body with sliding side walls and a roof was designed in accordance with several technical and regulatory documents using the KOMPAS-3D design software. Results: The covered detachable body with sliding side walls and a roof designed for the carriage of goods that require protection from atmospheric precipitation has been proposed. A scheme of a lock for side sliding doors and a linkage scheme of the doors’ middle part have been developed. Drawings of the main load-bearing elements of the car body are presented, including the underframe with three longitudinal and several transverse and auxiliary beams. The diagram of fastening the sliding door roller assemblies on the car body to the lower longitudinal beams and to the upper beam is given. Practical importance: The covered detachable body with sliding side walls and a roof allows reducing the time and human effort of loading and unloading the car, provides simultaneous loading and unloading of goods both from the side and from the top of the body using various hoisting devices.


2005 ◽  
Vol 4 (3) ◽  
pp. 265-269 ◽  
Author(s):  
Amélia C. Seidel ◽  
Fausto Miranda Jr. ◽  
Yara Juliano ◽  
Neil F. Novo

OBJECTIVE: This study has been designed to correlate the diameter of the greater saphenous vein in different levels of the lower limbs with the body mass index of each individual to determine a possible relation between them. METHODS: Fifty-two lower limbs in 26 volunteers (six males and 20 females) without a chronic venous disease record, aged 21-68 were evaluated. Prior to color-flow duplex scanning the body mass index was defined. The deep and superficial venous systems and perforator veins were assessed as described in the literature. The diameter of the greater saphenous vein was measured with ultrasound longitudinal imaging in seven different levels. For the statistical analysis, Student t test for paired data and Spearman test were used. RESULTS: The difference observed in saphenous venous in the second and third levels when compared to the lower right and left limbs was not considered significant and a single group was formed to correlate with body mass index. The correlation was considered statistically irrelevant. CONCLUSION: By correlating the diameters of the greater saphenous vein with the body mass index of each individual it was noted that the relation between them is not significant, therefore it can be assumed that tall thin individuals can have greater saphenous vein with similar diameter as short fat individuals.


2009 ◽  
Vol 24 (S1) ◽  
pp. 1-1
Author(s):  
J.L. Ayuso-Mateos

The concept of disability has changed enormously, from a notion of handicap (ICIDM,1980) to the idea of person with disability (ICF,2001). The ICF considers three different levels of disability: body, person and environment, offering a possibility to address it in a universal, integrative and interactive perspective. The utility of the ICF in shifting the attention from a medical to a biopsychosocial perspective is therefore accepted. Having 1464 categories, it is hardly applicable to clinical practice and research. Mood disorders are characterized by a variety of psychiatric and somatic symptoms, associated with a significant loss of quality of life and functioning. Practical tools, such as Core Sets, that cover the spectrum of problems are needed. ICF Core Sets have been developed for depression and are currently being developed by our group for bipolar disorder. The ICF Comprehensive Core Sets for depression is the second larger among 12 Comprehensive ICF Core Sets for chronic disorders. This fact reflects the complex limitations in functioning and the numerous interactions with environmental factors. From the first version of the ICF Core Sets for depression as well as the preliminary studies for the bipolar disorder's core sets mental functions are mostly represented among the body functions domain. Few aspects important to mood disorders, as suicide, have been found to be relevant from both a systematic literature review and an expert survey in BD and in the consensus conference were the Core Sets for depression were establish but are not covered in the ICF.


2014 ◽  
Vol 2 ◽  
pp. 293-298
Author(s):  
Ayagyoz Umbetzhanova ◽  
Gulmira Derbissalina ◽  
Vitaliy Koikov ◽  
Lyazzat Karsakbayeva ◽  
Nasikhat Nurgaliyeva ◽  
...  

Currently, in the Republic of Kazakhstan, the institution of professional managers and transparent forms of health organizations management, including modern management technologies, are being implemented.  Thus, sufficient professional competency of managerial decision-makers should be one of the most important factors in ensuring the development of a national health system and implementation of all current reforms in the industry. This article aims to investigate the high relevance of the evaluation of health care manager’s competencies and the development of measures to improve its level.In this cross-sectional study, we have analyzed managerial competencies of different levels of healthcare managers using a special questionnaire, which was developed by EPOS health management group to assess their competencies. We interviewed 61 managers of different levels. On the basis of feedbacks, core competencies and their possession by hospital managers were identified.At the first stage, respondents were asked to assess the importance of different competencies required for their work activity. All levels of management showed the high practical importance of assessed competencies. Results of the basic level demonstrated a practical importance of competencies ranging from 73% to 85%, the middle-level managers were from 83% to 93%, and senior level results were 97% to 98%.  The next stage of the survey was an assessment of respondent’s average level of self-esteem for the competencies they possessed.  Mid- level managers showed a higher possession of competencies than other levels, from 56.8% to 70.2%; the basic level was from 46.9% to 59.6%; and senior level was from 41.6% to 54.7%. The questionnaire was designed in a way to highlight the training gaps as the difference between the importance attributed to the command of a given piece of knowledge, competency or skills, and the level of proficiency the managers are demonstrating currently.  Finally, the third stage assessed the training required, wherein each management level has their specific training requirements.  As research shows, senior managers have the highest level of required training.  For senior level, the greatest needs for training are “self-management” and “quality management.”  For basic level, trainings are in “HR management” and “quality management.”  For middle managers, their training needs are in all domains of management.There is a discrepancy between the required and the actual competencies that different levels of health managers’ have. The largest gap between mandatory and existing competences exists at the basic level, in “Personnel Management.”  A gap in the mid-level was in “Information and Financial Management”; and it was in “Quality Management” for the senior level.  The proposed questionnaire could help to identify the most important training required to fill these gaps.


Author(s):  
Mahmut Mutlu ◽  
Alpönder Yıldız

This study was carried out to determine the influence of different levels of alfalfa meal and the addition of enzyme on performance, carcass and intestinal parameters in growing quails. Japanese quails (n=240), 1 days of age, were divided into 6 dietary treatment groups and the experiment lasted for 5 weeks. In each experiment group there were 4 replicates, and in each replicates there were 10 chicks. Six diets, arranged a factorial design with three alfalfa meal levels (0, 2.5 and 5.0 %) and two levels of added enzyme (0.0 and 1.0 g/kg) were used. The treatments did not effect on the body weight, feed intake and feed conversion ratio. However, relative liver, leg+back, intestine weights and crypt depth were significantly increased, and relative heart and breast weights and villus width decreased by dietary alfalfa meal levels. The addition of enzyme to diets containing alfalfa meal did not affect the performance and carcass parameters, but reduced the intestinal histomorphology parameters in quails. According to the results obtained from the experiment, it can be said that the use of alfalfa meal in growing quail diets did not affect the performance, but the use of alfalfa meal at the level of 2.5% in the diet promotes intestinal development.


2021 ◽  
Vol 9 (12) ◽  
pp. 1353
Author(s):  
Guillermo Figueroa-Muñoz ◽  
Carlos Molinet ◽  
Manuel Díaz ◽  
Patricio De los Ríos-Escalante

The southern king crab, Lithodes santolla, is an important fishery resource in the inner seas of Chilean Patagonia. The fishing gear used to catch southern king crab (bait trap) and its operation at different depths over several months provide the opportunity to gather information about relative abundance. The aim of the present study was to analyze the information collected from the catches of southern king crab and its associated fauna in the Magdalena Fjord to study the biodiversity and ecology of scavenging decapod crustaceans. Specifically, the study aimed to determine the bathymetric patterns of abundance by species, to model the abundance by season (winter and spring) and to determine the structuring pattern of scavenging decapods assemblage. Samples were collected between June and November 2019 by deploying traps in four bathymetric strata: 1 = 0–50 m; 2 = 51–100 m; 3 =101–150 m; 4 = 151–200 m. We registered a total of 673 decapod specimens associated with the southern king crab fishery, representing five species: Lithodes santolla (n = 96), Libidoclaea smithii (n = 10), Metacarcinus edwardsii (n = 58), Munida gregaria (n = 507) and Peltarion spinulosum (n = 2). The abundance of decapod species varied by month and bathymetric strata. We found bathymetric patterns for L. santolla abundance, M. gregaria, M. edwardsii, and total species abundance. The most informative model to explain scavenging decapod abundance by generalized linear model (GLM) included species and season. The null model of species co-occurrence analysis revealed that all species associations during the sampled months were random. Our study is the first that provides evidence about patterns of bathymetrical and temporal variation of scavenging decapod abundance and expands the body of knowledge regarding the biodiversity of scavenger decapods in the Magdalena Sound.


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