scholarly journals Assemblages and Scale in Archaeology

2017 ◽  
Vol 27 (1) ◽  
pp. 127-139 ◽  
Author(s):  
Oliver J.T. Harris
Keyword(s):  
Large Scale ◽  
Multiple Scales ◽  
Daily Life ◽  
Critical Issue ◽  
Small Scale ◽  
Processes Of Change ◽  
Origins Of Agriculture ◽  
The Real ◽  
Historical Processes

The growing interest in assemblages has already opened up a number of important lines of enquiry in archaeology, from the morphogenetic capacities of matter through to a rethinking of the concept of community. In this paper I want to explore how assemblages allow us to reconceptualize the critical issue of scale. Archaeologists have vacillated between expending energy on the ‘great processes’ of change like the evolution of humanity, the colonization of the globe or the origins of agriculture, and focusing on the momentary, fleeting nature of a small-scale ethnographic present. Where archaeologists have attempted to integrate different scales the result has usually been to turn to Annales-influenced or time perspectivism-driven approaches and their fixed, linear and ontologically incompatible layers of history. In contrast, I will use assemblages to examine how we can rethink both the emergence of multiple scales and their role in history, without reducing the differences of the small-scale to an epiphenomenal outcome of larger events, or treating large-scale historical processes as mere reifications of the ‘real’ on-the-ground stuff of daily life. As we will see, this approach also has consequences for the particular kind of reality we accord to large-scale archaeological categories.

Geomechanical and Fracture Network Interpretation of a Devonian Outcrop

2021 ◽  
pp. 1-16
Author(s):  
Scott McKean ◽  
Simon Poirier ◽  
Henry Galvis-Portilla ◽  
Marco Venieri ◽  
Jeffrey A. Priest ◽  
...  
Keyword(s):  
Large Scale ◽  
Multiple Scales ◽  
Fracture Network ◽  
Natural Fracture ◽  
Small Scale ◽  
Nugget Effect ◽  
Schmidt Hammer ◽  
Unconventional Reservoir ◽  
Fracture Anisotropy ◽  
Fracture Intensity

Summary The Duvernay Formation is an unconventional reservoir characterized by induced seismicity and fluid migration, with natural fractures likely contributing to both cases. An alpine outcrop of the Perdrix and Flume formations, correlative with the subsurface Duvernay and Waterways formations, was investigated to characterize natural fracture networks. A semiautomated image-segmentation and fracture analysis was applied to orthomosaics generated from a photogrammetric survey to assess small- and large-scale fracture intensity and rock mass heterogeneity. The study also included manual scanlines, fracture windows, and Schmidt hammer measurements. The Perdrix section transitions from brittle fractures to en echelon fractures and shear-damage zones. Multiple scales of fractures were observed, including unconfined, bedbound fractures, and fold-relatedbed-parallel partings (BPPs). Variograms indicate a significant nugget effect along with fracture anisotropy. Schmidt hammer results lack correlation with fracture intensity. The Flume pavements exhibit a regionally extensive perpendicular joint set, tectonically driven fracturing, and multiple fault-damage zones with subvertical fractures dominating. Similar to the Perdrix, variograms show a significant nugget effect, highlighting fracture anisotropy. The results from this study suggest that small-scale fractures are inherently stochastic and that fractures observed at core scale should not be extrapolated to represent large-scale fracture systems; instead, the effects of small-scale fractures are best represented using an effective continuum approach. In contrast, large-scale fractures are more predictable according to structural setting and should be characterized robustly using geological principles. This study is especially applicable for operators and regulators in the Duvernay and similar formations where unconventional reservoir units abut carbonate formations.

scholarly journals WS-AM: Weakly Supervised Attention Map for Scene Recognition

Electronics ◽  
2019 ◽  
Vol 8 (10) ◽  
pp. 1072 ◽  
Author(s):  
Shifeng Xia ◽  
Jiexian Zeng ◽  
Lu Leng ◽  
Xiang Fu
Keyword(s):  
Large Scale ◽  
Multiple Scales ◽  
Scene Recognition ◽  
Small Scale ◽  
Great Success ◽  
Global Feature ◽  
Benchmark Datasets ◽  
Local Mean ◽  
Weakly Supervised ◽  
Fully Connected

Recently, convolutional neural networks (CNNs) have achieved great success in scene recognition. Compared with traditional hand-crafted features, CNN can be used to extract more robust and generalized features for scene recognition. However, the existing scene recognition methods based on CNN do not sufficiently take into account the relationship between image regions and categories when choosing local regions, which results in many redundant local regions and degrades recognition accuracy. In this paper, we propose an effective method for exploring discriminative regions of the scene image. Our method utilizes the gradient-weighted class activation mapping (Grad-CAM) technique and weakly supervised information to generate the attention map (AM) of scene images, dubbed WS-AM—weakly supervised attention map. The regions, where the local mean and the local center value are both large in the AM, correspond to the discriminative regions helpful for scene recognition. We sampled discriminative regions on multiple scales and extracted the features of large-scale and small-scale regions with two different pre-trained CNNs, respectively. The features from two different scales were aggregated by the improved vector of locally aggregated descriptor (VLAD) coding and max pooling, respectively. Finally, the pre-trained CNN was used to extract the global feature of the image in the fully- connected (fc) layer, and the local features were combined with the global feature to obtain the image representation. We validated the effectiveness of our method on three benchmark datasets: MIT Indoor 67, Scene 15, and UIUC Sports, and obtained 85.67%, 94.80%, and 95.12% accuracy, respectively. Compared with some state-of-the-art methods, the WS-AM method requires fewer local regions, so it has a better real-time performance.

Contact Mechanics Analysis of a Rubber Piece on a Smooth Plate

2009 ◽  
Author(s):  
Kyosuke Ono
Keyword(s):  
Contact Mechanics ◽  
Elastic Deformation ◽  
Contact Area ◽  
Large Scale ◽  
Glass Plate ◽  
Applied Pressure ◽  
Small Scale ◽  
Asperity Contact ◽  
The Real ◽  
Parameter Values

In order to elucidate contact and friction characteristics of rubbers, numerical analysis of asperity contact mechanics of a rubber piece with a smooth glass plate was carried out on the basis of an asperity contact model that considers van der Waal’s (vdW) pressure. First, by ignoring vdW pressure and the elastic deformation of the mean height surface, asperity contact characteristics were analyzed using the measured Young’s modulus, and surface parameter values that could yield the measured contact area were estimated. Next, asperity contact characteristics were analyzed by considering the vdW pressure and elastic deformation of a rough sphere that is a model of a large-scale asperity having small-scale asperities. It was found that the actual contact area was similar to the measured contact area; this result could not be obtained without assuming an rms asperity height of ∼0.1 μm for the small-scale asperities. It was also found that the friction coefficient decreased with an increase in the applied pressure in the cases where the friction force is proportional to the real area of contact and to the real internal contact pressure.

scholarly journals Influence of Restraint Conditions on Welding Residual Stresses in H-Type Cracking Test Specimens

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2700 ◽  
Author(s):  
Jiamin Sun ◽  
Jonas Hensel ◽  
Thomas Nitschke-Pagel ◽  
Klaus Dilger
Keyword(s):  
Numerical Simulation ◽  
Tensile Stress ◽  
Residual Stresses ◽  
Experimental Method ◽  
Large Scale ◽  
Small Scale ◽  
Welded Structures ◽  
The Real ◽  
Restrained Cracking ◽  
Welding Processes

From the viewpoint of mechanics, weld cracking tends to occur if the induced tensile stress surpasses a certain value for the particular materials and the welding processes. Welding residual stresses (WRS) can be profoundly affected by the restraint conditions of the welded structures. For estimating the tendency of weld cracking, the small-scale H-type slit joints have been widely used for cracking tests. However, it is still hard to decide whether the real large-scale component can also be welded without cracking even though the tested weld cracking specimens on the laboratory scale can be welded without cracking. In this study, the intensity of restraint which quantitatively indicates how much a joint is restrained is used. The influence of restraint condition (intensity of restraint) on WRS is systematically investigated using both the numerical simulation and the experimental method. The achievement obtained in the current work is very beneficial to design effective H-type self-restrained cracking test specimens for evaluating the sensitivity of the material and the welding procedures for weld cracking in the real large-scale components.

scholarly journals The Aesthetics of Making

2021 ◽  
Author(s):  
◽  
Matt Buttimore
Keyword(s):  
Architectural Design ◽  
Large Scale ◽  
Multiple Scales ◽  
Small Scale ◽  
Urban Context ◽  
Production Scale ◽  
Community Culture ◽  
Detail Design ◽  
The People ◽  
Cultural Implications

<p><b>As the architectural design process evolves and embraces new techniques and technologies and mass production is more readily available, the relationship between designer and craftsman has become more distant. As we look to produce more and more architecture every year on a larger production scale, the craft and detail of the architecture begin to fall at the wayside. As we lose this relationship, the culture and identity of a place are also lost as these technologies are not responding to specific site and cultural implications.</b></p> <p>One such site where this is applicable is the small coastal town of Onemana in the Coromandel, a town of slightly more than 300 homes constructed as a single development in the 1980s. The rush to produce more homes and on a larger scale has meant the town’s architecture does not reflect the community culture or coastal identity of the place or the people who live there. </p> <p>This thesis argues that there is an existing relationship between craftsperson and designer and explores how this relationship and detail design can generate and inform architectural design. Understanding this relationship will generate detail design that has a more powerful outcome on the spatial qualities of the architecture and generates my own detail design language. It also argues that there exists a relationship between detail design and the urban environment, which is not fully utilised in the industry.</p> <p>The thesis proposes that this can be achieved by testing and evaluating this hypothesis across three scales and three types of urban context. The three test sites identified are a small scale private dwelling, a mid-scale cultural installation and a large scale town centre. Using the process of beginning with detail design, architectural installations will be implemented and evaluated before moving to the following location. As result the method will be proven to work across multiple scales and reflect a variety of cultural inputs.</p>

Some comparisons between heterogeneous and homogeneous layers for nonlinear SH waves in terms of heterogeneous and nonlinear effects

2020 ◽  
pp. 108128652094635 ◽  
Author(s):  
Dilek Demirkuş
Keyword(s):  
Solitary Wave ◽  
Large Scale ◽  
Multiple Scales ◽  
Nonlinear Effects ◽  
Small Scale ◽  
Solitary Wave Solutions ◽  
Nls Equation ◽  
Sh Waves ◽  
Wave Solutions ◽  
The One

This paper aims to make some comparative studies between heterogeneous and homogeneous layers for nonlinear shear horizontal (SH) waves in terms of the heterogeneous and nonlinear effects. Therefore, with this aim, two layers are defined as follows: on the one hand, one layer consists of hyperelastic, isotropic, heterogeneous, and generalized neo-Hookean materials; on the other hand, another layer is made up of hyperelastic, isotropic, homogeneous, and generalized neo-Hookean materials. Moreover, it is assumed that upper boundaries are stress-free and lower boundaries are rigidly fixed. The method of multiple scales is used in both analyses, in addition to using the known solutions of the nonlinear Schrödinger (NLS) equation, called bright and dark solitary wave solutions; these comparisons are made, numerically, and then all results are given for the lowest branch of both dispersion relations, graphically. Moreover, these comparisons are observed both on a large scale and on a small scale, not only in terms of the bright and dark solitary wave solutions but also in terms of the heterogeneous and nonlinear effects.

Use of High-Resolution DIDSON Sonar to Quantify Attributes of Predation at Ecologically Relevant Space and Time Scales

2013 ◽  
Vol 47 (1) ◽  
pp. 33-46 ◽  
Author(s):  
Victoria E. Price ◽  
Peter J. Auster ◽  
Laura Kracker
Keyword(s):  
High Resolution ◽  
Time Scales ◽  
Large Scale ◽  
Multiple Scales ◽  
Predation Rate ◽  
Visual Observation ◽  
Small Scale ◽  
Dual Frequency ◽  
Predator Prey ◽  
Space And Time

AbstractPredator-prey interactions of large vagile fishes are difficult to study in the ocean due to limitations in the space and time requirements for observations. Small-scale direct underwater observations by divers (ca. <10 m radius) and large-scale hydroacoustic surveys (10 s m2 to 100 s km2) are traditional approaches for surveying fish. However, large piscivorous predators identify and attack prey at the scale of meters to tens of meters. Dual-Frequency Identification Sonar (or DIDSON) is a high-resolution acoustic camera operating in the MHz range that provides detailed continuous video-like imaging of objects up to a range of 30 m. This technology can be used to observe predator-prey interactions at ecologically relevant space and time scales often missed by traditional methods. Here we establish an approach for quantifying predation-related behaviors from DIDSON records. Metrics related to predator and prey group size, prey responses to predation, predation rate, predator strategies, and the nonrandom use of landscape features by both predator and prey are described. In addition, relationships between patterns in these attributes are tested and issues regarding sampling strategies for future studies are discussed. We suggest that approaches combining direct visual observation and acoustic sampling at multiple scales are required to quantify variation in these relationships across underwater landscapes.

scholarly journals Contact patch memory of tyres leading to lateral vibrations of four-wheeled vehicles

2013 ◽  
Vol 371 (1993) ◽  
pp. 20120427 ◽  
Author(s):  
Dénes Takács ◽  
Gábor Stépán
Keyword(s):  
Large Scale ◽  
Multiple Scales ◽  
Travelling Wave ◽  
Small Scale ◽  
Global Dynamics ◽  
Contact Patch ◽  
Lateral Vibrations ◽  
Wide Range ◽  
The Stability ◽  
Wheeled Vehicles

It has been shown recently that the shimmy motion of towed wheels can be predicted in a wide range of parameters by means of the so-called memory effect of tyres. This delay effect is related to the existence of a travelling-wave-like motion of the tyre points in contact with the ground relative to the wheel. This study shows that the dynamics within the small-scale contact patch can have an essential effect on the global dynamics of a four-wheeled automobile on a large scale. The stability charts identify narrow parameter regions of increased fuel consumption and tyre noise with the help of the delay models that are effective tools in dynamical problems through multiple scales.

Controlled large scale ecosystem manipulation to explore key ecosystem components at multiple scales

2021 ◽  
Author(s):  
Jan Frouz
Keyword(s):  
Large Scale ◽  
Environmental Science ◽  
Multiple Scales ◽  
Experimental Manipulation ◽  
Small Scale ◽  
Catchment Scale ◽  
Natural Processes ◽  
Complex Interactions ◽  
Spatiotemporal Scales ◽  
A Site

&lt;p&gt;Understanding how natural processes arise from complex interactions between particular processes at small spatiotemporal scales and in turn how these processes form patterns at large spatiotemporal scales is one of the current principal questions in environmental science. The problem is very complicated, as in many cases, key processes are often studied by researchers in separate disciplines such as ecology, soil science or hydrology. One of the major obstacles is that the processes at a landscape scale are difficult to manipulate and, in many cases, even measure. In particular, the belowground processes are in many cases overlooked or at least understudied. Here we briefly describe a methodological solution used to cope with this problem and describe artificial catchments designed for experimental manipulation at the level of a landscape, called FALCON. This array has two treatments: one mimics a site reclaimed using an alder plantation and the other was left to unassisted primary succession. For each treatment, there were two replicates in four similar catchments. Individual catchments are hydrologically isolated from the environment and equipped with instruments, so that all the main processes and all significant flows of substances and energy in the ecosystem can be monitored, including the cycling of water, nutrients and gas between the ecosystem and the atmosphere. In addition, in each catchment there are sets of lysimeters, which allow the study of small-scale processes and how these can be extrapolated to the catchment scale. In addition, two lysimetric fields exist alongside the catchments for monitoring the effects of the experimental manipulation.&lt;/p&gt;

scholarly journals The Aesthetics of Making

2021 ◽  
Author(s):  
◽  
Matt Buttimore
Keyword(s):  
Architectural Design ◽  
Large Scale ◽  
Multiple Scales ◽  
Small Scale ◽  
Urban Context ◽  
Production Scale ◽  
Community Culture ◽  
Detail Design ◽  
The People ◽  
Cultural Implications

<p><b>As the architectural design process evolves and embraces new techniques and technologies and mass production is more readily available, the relationship between designer and craftsman has become more distant. As we look to produce more and more architecture every year on a larger production scale, the craft and detail of the architecture begin to fall at the wayside. As we lose this relationship, the culture and identity of a place are also lost as these technologies are not responding to specific site and cultural implications.</b></p> <p>One such site where this is applicable is the small coastal town of Onemana in the Coromandel, a town of slightly more than 300 homes constructed as a single development in the 1980s. The rush to produce more homes and on a larger scale has meant the town’s architecture does not reflect the community culture or coastal identity of the place or the people who live there. </p> <p>This thesis argues that there is an existing relationship between craftsperson and designer and explores how this relationship and detail design can generate and inform architectural design. Understanding this relationship will generate detail design that has a more powerful outcome on the spatial qualities of the architecture and generates my own detail design language. It also argues that there exists a relationship between detail design and the urban environment, which is not fully utilised in the industry.</p> <p>The thesis proposes that this can be achieved by testing and evaluating this hypothesis across three scales and three types of urban context. The three test sites identified are a small scale private dwelling, a mid-scale cultural installation and a large scale town centre. Using the process of beginning with detail design, architectural installations will be implemented and evaluated before moving to the following location. As result the method will be proven to work across multiple scales and reflect a variety of cultural inputs.</p>

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