Recent Developments in the Computational Modelling of Textile Membranes and Inflatable Structures

Author(s):  
Dieter Ströbel ◽  
Peter Singer

The recycling and reuse of materials and objects were extensive in the past, but have rarely been embedded into models of the economy; even more rarely has any attempt been made to assess the scale of these practices. Recent developments, including the use of large datasets, computational modelling, and high-resolution analytical chemistry, are increasingly offering the means to reconstruct recycling and reuse, and even to approach the thorny matter of quantification. Growing scholarly interest in the topic has also led to an increasing recognition of these practices from those employing more traditional methodological approaches, which are sometimes coupled with innovative archaeological theory. Thanks to these efforts, it has been possible for the first time in this volume to draw together archaeological case studies on the recycling and reuse of a wide range of materials, from papyri and textiles, to amphorae, metals and glass, building materials and statuary. Recycling and reuse occur at a range of site types, and often in contexts which cross-cut material categories, or move from one object category to another. The volume focuses principally on the Roman Imperial and late antique world, over a broad geographical span ranging from Britain to North Africa and the East Mediterranean. Last, but not least, the volume is unique in focusing upon these activities as a part of the status quo, and not just as a response to crisis.


2017 ◽  
Vol 16 (2) ◽  
pp. 15-37
Author(s):  
JANET AINLEY ◽  
DAVE PRATT

Previous research has demonstrated how young children can identify the signal in data. In this exploratory study we considered how they might also express meanings for noise when creating computational models using recent developments in software tools. We conducted extended clinical interviews with four groups of 11-year-olds and analysed the videos of the children’s activity through a process of progressive focusing. In this paper we explain the design of our tasks and report how the children’s expressions for noise, supported by the need to communicate with the software, developed from specific values to verbal expressions of uncertainty such as ‘around’, to offering ranges of values. We consider the opportunities and constraints of such an approach, which we call ‘purposeful computational modelling’. First published November 2017 at Statistics Education Research Journal Archives


2020 ◽  
Vol 14 (3) ◽  
pp. 349-374
Author(s):  
F. LeRon Shults

This article explores some of the ways in which the conceptual apparatus of A Thousand Plateaus, and especially its machinic metaphysics, can be connected to recent developments in computer modelling and social simulation, which provide new tools for thinking that are becoming increasingly popular among philosophers and social scientists. Conversely, the successful deployment of these tools provides warrant for the flat ontology articulated in A Thousand Plateaus and therefore contributes to the ‘reversal of Platonism’ for which Deleuze had called in his earlier works, such as Logic of Sense. The first major section offers a brief exposition of some key concepts in A Thousand Plateaus in order to set the stage for the second and third major sections, which argue that the fabrication of a metaphysics of immanence can be accelerated by connecting its conceptual apparatus more explicitly to insights derived from philosophical analyses of computational modelling and simulation and the social scientific use of ‘assemblage theory’. The article concludes with a summary of the argument and a brief consideration of some of the potential ethical and political implications of this interdisciplinary engagement.


Author(s):  
Chiara Taddeo ◽  
Marco Di Giovanni ◽  
Alberto Viskovic ◽  
Piero D'Asdia

<p>Emergencies like post hurricane or earthquake need of buildings quick and easy to build. These buildings have to be great open spaces in order to host as many people as possible. These buildings can be non-temporary because they are useful for one, two years or more. For this reason, they have to be designed like permanent buildings. This exclude a great number of typologies as for example inflatable structures. The typology suggested is cables net and membrane roofs with hyperbolic paraboloid shape. These typology permits to cover very large span and it is built easily and quickly. In order to encourage a sustainability approach to build, the paper promotes recent developments in the field of material engineering that have allowed for the use of natural materials for common structural elements instead of traditional materials such as steel or concrete. In this context, hemp is a very interesting material for structural building design. This paper proposes the use of hemp cables for roofs with hyperbolic paraboloid cables nets, which sees the use of a sustainability material for structure thus having a very low environmental impact in terms of structural weight. The paper discusses five different plan sizes and two different hyperbolic paraboloid surface radius of curvatures. The cable traction, which gives the cable net stiffness, was varied in order to give a parametric database of structural response. Three-dimensional geometrically nonlinear element analyses were carried out on different geometries and a parametrization of the borders structures of anchorage is given.</p>


2017 ◽  
Vol 73 (8) ◽  
pp. 628-640 ◽  
Author(s):  
Su Datt Lam ◽  
Sayoni Das ◽  
Ian Sillitoe ◽  
Christine Orengo

Computational modelling of proteins has been a major catalyst in structural biology. Bioinformatics groups have exploited the repositories of known structures to predict high-quality structural models with high efficiency at low cost. This article provides an overview of comparative modelling, reviews recent developments and describes resources dedicated to large-scale comparative modelling of genome sequences. The value of subclustering protein domain superfamilies to guide the template-selection process is investigated. Some recent cases in which structural modelling has aided experimental work to determine very large macromolecular complexes are also cited.


2008 ◽  
Vol 5 (suppl_3) ◽  
pp. 173-190 ◽  
Author(s):  
Marc W van der Kamp ◽  
Katherine E Shaw ◽  
Christopher J Woods ◽  
Adrian J Mulholland

Molecular simulation is increasingly demonstrating its practical value in the investigation of biological systems. Computational modelling of biomolecular systems is an exciting and rapidly developing area, which is expanding significantly in scope. A range of simulation methods has been developed that can be applied to study a wide variety of problems in structural biology and at the interfaces between physics, chemistry and biology. Here, we give an overview of methods and some recent developments in atomistic biomolecular simulation. Some recent applications and theoretical developments are highlighted.


1999 ◽  
Vol 26 (1) ◽  
pp. 217-260
Author(s):  
FERNAND GOBET

In his review, Rispoli's main concern is that Elman et al.'s book will aggravate the degree of polarization in developmental psycholinguistics. I cannot really comment on this worry, as developmental psycholinguistics is not my field. Instead, I will discuss some questions more related to my background – the role of computational modelling in Elman et al.'s approach.Elman et al.'s ambitious goal is to propose theories of cognitive development that are grounded in our knowledge of biology. This is of course what the great Jean Piaget tried to achieve during his lifetime – unsuccessfully, as we know. Elman et al.'s advantage over Piaget is that they have a set of computational tools, connectionism, which both allows them to specify theories precisely and to study complex behaviours (such as epigenesis, where innate and environmental factors interact to create new levels of complexity) that are just beyond the (unaided) human mind. Even though I will highlight some of the weaknesses of their approach below, I should emphasize that reading their book was an exciting and enjoyable experience.As noted by Rispoli, there are important problems with the simulations reported by Elman et al. Rispoli focuses on simulations of past tense acquisition and syntax acquisition, but the problems are by no means limited to these areas. I will briefly consider two recent developments in neural net research, one taken from the field of language acquisition, and one from elsewhere, which underscore some of the difficulties of the simulations discussed in the book.


Author(s):  
Adam W. Turner ◽  
William G. Davids ◽  
Michael L. Peterson

In an effort to reduce deployment cost and time, the military is taking a closer look at how to more efficiently deploy and construct their shelters. In support of this effort, one current research topic is lightweight inflatable structures used for maintenance and shelter. While inflatable fabric structures are not new, recent developments have vastly improved the load-carrying capability and durability of these structures, allowing them to replace traditional framed tent structures. This is due in large part to the development of inflated structural members called airbeams, which are essentially pressurized fabric tubes with an impermeable internal bladder. The working pressures of the structural airbeams are upwards of 592 kPa. There are two major types of airbeams; woven and braided. The woven beams generally operate at lower pressures (69-296 kPa), while the more recently developed braided beams operate at much higher pressures (296-592 kPa). Since the technology of airbeams is relatively new, there are few standard material tests for determining the fabric constitutive properties necessary for airbeam design. This represents a significant barrier to their efficient implementation. This paper will present the current state of the art in relevant areas of textile testing and describe test practices useful for identifying the constitutive properties of the airbeam fabrics. In addition, preliminary testing of inflated airbeams will also be presented, and the results discussed.


2003 ◽  
Vol 47 (4) ◽  
pp. 175-183 ◽  
Author(s):  
R.Y.G. Andoh ◽  
A.J. Saul

The paper reviews the evolution of Hydrodynamic Vortex Separators (HDVS) in the context of their application as high rate rotary flow separators for achieving water quality improvements to meet with regulatory requirements in Europe and North America. The types of HDVS and their application for the control of wet-weather discharges such as combined sewer overflows (CSOs), sanitary sewer overflows (SSOs) and stormwater are outlined and a number of myths surrounding their use, dispelled. Reference is made to outputs of peer reviewed comprehensive monitoring, evaluation and demonstration projects on pilot and full-scale installations to demonstrate the efficacy and extensive track record of these systems. Recent developments and innovations in HDVS technologies are discussed, focusing on their combined use as solids liquid separators, contact vessels for wastewater disinfection, the incorporation of self-cleansing screening devices for the control of aesthetic pollutants (e.g. floatables) and the use of computational modelling for optimisation.


Author(s):  
C. R. A. Catlow ◽  
Z. X. Guo ◽  
M. Miskufova ◽  
S. A. Shevlin ◽  
A. G. H. Smith ◽  
...  

We review recent developments and applications of computational modelling techniques in the field of materials for energy technologies including hydrogen production and storage, energy storage and conversion, and light absorption and emission. In addition, we present new work on an Sn 2 TiO 4 photocatalyst containing an Sn(II) lone pair, new interatomic potential models for SrTiO 3 and GaN, an exploration of defects in the kesterite/stannite-structured solar cell absorber Cu 2 ZnSnS 4 , and report details of the incorporation of hydrogen into Ag 2 O and Cu 2 O. Special attention is paid to the modelling of nanostructured systems, including ceria (CeO 2 , mixed Ce x O y and Ce 2 O 3 ) and group 13 sesquioxides. We consider applications based on both interatomic potential and electronic structure methodologies; and we illustrate the increasingly quantitative and predictive nature of modelling in this field.


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