When simulating the behaviour of granular assemblies and multi‐body systems using a discrete element analysis, the shape representation of the bodies and the contact detection…
Abstract
When simulating the behaviour of granular assemblies and multi‐body systems using a discrete element analysis, the shape representation of the bodies and the contact detection algorithm greatly influence the flexibility, accuracy and efficiency of the simulation. Several geometrical shape descriptors of two and three dimensional arbitrary rigid bodies are reviewed and a flexible 3‐D descriptor introduced. The aim is to identify appropriate shape descriptors which allow a variety of types of bodies to be investigated while ensuring accurate and efficient detection of inter‐particle contacts. Polygons/polyhedrons, and continuous and discrete function representations are examined. The investigation favours discrete representations due to their efficiency and flexibility, but illustrates the elegance and efficiency of using a continuous function representation, e.g. a superquadric, to generate the discrete representation and simplify the contact detection process.
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Caroline Wolski, Kathryn Freeman Anderson and Simone Rambotti
Since the development of the COVID-19 vaccinations, questions surrounding race have been prominent in the literature on vaccine uptake. Early in the vaccine rollout, public health…
Abstract
Purpose
Since the development of the COVID-19 vaccinations, questions surrounding race have been prominent in the literature on vaccine uptake. Early in the vaccine rollout, public health officials were concerned with the relatively lower rates of uptake among certain racial/ethnic minority groups. We suggest that this may also be patterned by racial/ethnic residential segregation, which previous work has demonstrated to be an important factor for both health and access to health care.
Methodology/Approach
In this study, we examine county-level vaccination rates, racial/ethnic composition, and residential segregation across the U.S. We compile data from several sources, including the American Community Survey (ACS) and Centers for Disease Control (CDC) measured at the county level.
Findings
We find that just looking at the associations between racial/ethnic composition and vaccination rates, both percent Black and percent White are significant and negative, meaning that higher percentages of these groups in a county are associated with lower vaccination rates, whereas the opposite is the case for percent Latino. When we factor in segregation, as measured by the index of dissimilarity, the patterns change somewhat. Dissimilarity itself was not significant in the models across all groups, but when interacted with race/ethnic composition, it moderates the association. For both percent Black and percent White, the interaction with the Black-White dissimilarity index is significant and negative, meaning that it deepens the negative association between composition and the vaccination rate.
Research limitations/implications
The analysis is only limited to county-level measures of racial/ethnic composition and vaccination rates, so we are unable to see at the individual-level who is getting vaccinated.
Originality/Value of Paper
We find that segregation moderates the association between racial/ethnic composition and vaccination rates, suggesting that local race relations in a county helps contextualize the compositional effects of race/ethnicity.
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Duffy Morf, Dale L. Flesher, Mario Hayek, Stephanie Pane and Caroline Hayek
The purpose of this paper is to analyze how social power and pressures over the past century have shifted the audience towards which organizations find themselves accountable, as…
Abstract
Purpose
The purpose of this paper is to analyze how social power and pressures over the past century have shifted the audience towards which organizations find themselves accountable, as reflected in their social responsibility reporting.
Design/methodology/approach
The authors use historical analysis to analyze qualitatively the annual reports of prominent US organizations between the 1900s to the early 2000s. Adopting an integrationist perspective, the authors ground their research in stakeholder theory and reviewed passages in annual reports identifying the audiences of socially responsible organizational initiatives.
Findings
The study revealed that the degree and focus of corporate accountability shifted over the course of the 1900s, and that this change was due to shifts in influence and power stemming from different stakeholders. During the early 1900s, organizations were more concerned with pleasing internal stakeholders (i.e. employees); however, economic and social events shifted this attention towards external stakeholder groups (i.e. the environment) during the latter part of the century. More recent events fueled social pressures, resulting in legislation and social reporting guidelines during the first decade of the twenty‐first century.
Practical implications
Organizations will continue to be held accountable as new stakeholder groups emerge and different social movements and economic changes transpire, exerting more pressure on organizations to be socially responsible. Furthermore, organizations need to remain current on social reporting guidelines, as these increasingly become the means of communication with multiple stakeholder groups. In summary, findings suggest that organizations would benefit by staying abreast of economic and social cues when developing their socially responsible initiatives and reporting.
Originality/value
The unique contribution of this paper is to identify how economic and social events place pressure on organizations and shift organizational attention through an accountability mechanism, resulting in changes in the focus of social responsibility reporting.
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BOOKS and Libraries for the Blind form the subject of a paper by Dr. Robert C. Moon in the May Library Journal. The writer is the son of William Moon, the inventor of the system…
Abstract
BOOKS and Libraries for the Blind form the subject of a paper by Dr. Robert C. Moon in the May Library Journal. The writer is the son of William Moon, the inventor of the system of embossed writing bearing his name. He describes the systems of writing for the blind in use, and the various agencies for circulating literature. After examining the existing departments for the blind in Public Libraries, he comes to the conclusion that “all the libraries need more books, and if they are to reach and teach the adult blind they must have a fair proportion of them in the Moon type. All Public Libraries should possess a few works printed in the various types, care being taken to have a good supply of those embossed in the special type which is taught in the schools for the blind of the immediate locality, in order that the pupils in vacation time, and the graduates of the schools may be provided with reading matter, but the infirm and aged blind will be found in almost all communities, and for them books printed in the Moon type are indispensable. Alice S. Tyler describes the League of Library Commissions. “The success of the experiment in co‐operation which was inaugurated in 1901 by the library commissions of Wisconsin, Minnesota, and Iowa, whereby printed matter of common interest and equal necessity and value to these commissions was issued jointly, led to the suggestion that a national organization might more economically carry forward these and other lines of co‐operative work, leaving to the overcrowded state commission workers more time and money for the peculiar problems of each state.” This suggestion was brought up at the St. Louis conference, and resulted in an organization being formed under the title of the League of Library Commissions, consisting of one representative from each of the commissions included. The particular directions in which the League will promote co‐operative work are: carefully prepared lists of books for first purchase for small libraries; lists of new books which, upon examination, had been found desirable ; handbook of suggestions and direction as to the organization and management of small libraries; printed statement regarding the aims and methods of state library commissions, with comparison of their laws; definite help and suggestions on the subject of library buildings, especially floor‐plans arranged for economic administration, growing out of the experience of the library commissions in connection with the erection of Carnegie and other library buildings within the last few years; united effort to bring to the attention of book publishers the urgent need of good, durable binding, adequate indexing, &c.