scholarly journals Detection and Delineation of Sorted Stone Circles in Antarctica

2020 ◽  
Vol 12 (1) ◽  
pp. 160
Author(s):  
Francisco Pereira ◽  
Jorge S. Marques ◽  
Sandra Heleno ◽  
Pedro Pina
Keyword(s):  
Template Matching ◽  
The Past ◽  
High Resolution Imagery ◽  
Digital Elevation ◽  
Band Filter ◽  
Barton Peninsula ◽  
Surface Patterns ◽  
Underlying Processes ◽  
Automated Methods ◽  
Metric Scale

Sorted stone circles are natural surface patterns formed in periglacial environments. Their relation to permafrost conditions make them very helpful for better understanding the past climates where they were formed and have evolved and also for monitoring current underlying processes in case circles are active. These metric scale patterns that occur in clusters of tens to thousands of circular elements, can be more comprehensively characterized if automated methods are used. This paper addresses their identification and delineation through the development and testing of a set of automated approaches, namely, template matching, sliding band filter, and dynamic programming. All of these methods take advantage of the 3D shape of the structures conveyed by digital elevation models (DEM), built from ultra-high resolution imagery captured by unmanned aerial vehicles (UAV) surveys developed in Barton Peninsula, King George Island, Antarctica (62°S). The best detection results achieve scores above 85%, while the delineations are performed with errors as low as 7%.

Thermal Science of Weld Bead Defects: A Review

2010 ◽  
Vol 133 (3) ◽  
Author(s):  
P. S. Wei
Keyword(s):  
Stress Concentration ◽  
Experimental Results ◽  
Materials Processing ◽  
Scale Analysis ◽  
Fluid Physics ◽  
The Past ◽  
Good Comparison ◽  
Surface Patterns ◽  
Pattern Formations ◽  
Working Parameters

Mechanisms for the formation of bead defects, such as humping, gouging, rippling, and other unexpected surface patterns, encountered in welding or drilling are interpreted and reviewed from thermal-fluid science viewpoint. These defects usually accompanying with porosity, undercut, segregation, stress concentration, etc., seriously reduce the properties and strength of the joint or solidification. Even though different mechanisms for formation of the defects have been extensively proposed in the past, more systematical understanding of pattern formations from thermal, fluid, physics, electromagnetic, pattern selections, and metallurgy sciences is still limited. The effects of working parameters and properties on humping and rippling, for example, can be systematically and quantitatively interpreted from scale analysis presented in this work. Good comparison with experimental results reveals mechanisms of different surface patterns. The mechanistic findings for bead defects are also useful for other manufacturing and materials processing.

scholarly journals Strengths of Exaggerated Tsunami-Originated Placenames: Disaster Subculture in Sanriku Coast, Japan

2019 ◽  
Vol 8 (10) ◽  
pp. 429 ◽  
Author(s):  
Yuzuru Isoda ◽  
Akio Muranaka ◽  
Go Tanibata ◽  
Kazumasa Hanaoka ◽  
Junzo Ohmura ◽  
...  
Keyword(s):  
Low Frequency ◽  
Local Area ◽  
Local Communities ◽  
Sanriku Coast ◽  
The Past ◽  
Disaster Experience ◽  
Digital Elevation ◽  
Disaster Subculture ◽  
Group Interviews ◽  
Elevation Model

Disaster-originated placename is a kind of disaster subculture that is used for a practical purpose of identifying a location while reminding the past disaster experience. They are expected to transmit the risks and knowledge of high-risk low-frequency natural hazards, surviving over time and generations. This paper compares the perceptions to tsunami-originated placenames in local communities having realistic and exaggerated origins in Sanriku Coast, Japan. The reality of tsunami-originated placenames is first assessed by comparing the tsunami run-ups indicated in the origins and that of the tsunami in the Great East Japan Earthquake 2011 using GIS and digital elevation model. Considerable proportions of placenames had exaggerated origins, but the group interviews to local communities revealed that origins indicating unrealistic tsunami run-ups were more believed than that of the more realistic ones. We discuss that accurate hazard information will be discredited if it contradicts to the people’s everyday life and the desire for safety, and even imprecise and ambiguous information can survive if it is embedded to a system of local knowledge that consistently explains the various facts in a local area that requires explanation.

scholarly journals The Prospects of Large Surveys in Astronomy

1998 ◽  
Vol 179 ◽  
pp. 3-10
Author(s):  
M. Harwit
Keyword(s):  
Similar Comparison ◽  
The Past ◽  
Relative Extent ◽  
New Phenomena ◽  
Observational Techniques ◽  
Underlying Processes

Major astronomical discoveries of the past have been closely linked with the implementation of strikingly powerful new observational techniques in astronomy. Surveys, in general, were not as likely to lead to the discovery of new phenomena. In recent years, however, many far-reaching instrumental advances have been incorporated into observatories in space, whose mission, in part, was to conduct unbiased surveys. Here, we provide a review of some of the successes of earlier surveys, with the purpose of identifying the relative extent to which increased instrumental capabilities, as contrasted to increased sky coverage or numbers of sources observed, may be expected to lead to the discovery of new phenomena. A similar comparison can be made of the extent to which these two approaches—emphasis on instrumental capabilities, as contrasted to emphasis on sky coverage— also contribute to an increase in astrophysical understanding. Here, the distinction needs to be made between discovering a new phenomenon and understanding its underlying processes.

25 years of movement monitoring on South Peak, Turtle Mountain: understanding the hazard

2009 ◽  
Vol 46 (3) ◽  
pp. 256-269 ◽  
Author(s):  
Corey R. Froese ◽  
Francisco Moreno ◽  
Michel Jaboyedoff ◽  
David M. Cruden
Keyword(s):  
Monitoring Program ◽  
Rock Avalanche ◽  
Light Detection And Ranging ◽  
Short Term ◽  
The Past ◽  
Digital Elevation ◽  
Government Project ◽  
Elevation Model ◽  
Movement Monitoring ◽  
Deep Fractures

In 1981, an Alberta Government project upgraded the monitoring of South Peak, Turtle Mountain, on the south margin of the 1903 Frank Slide. The monitoring program aimed at understanding the rates of deformation over large, deep fractures encompassing South Peak and predicting a second large rock avalanche on the mountain. The monitoring program consisted of a complement of static ground points and remotely monitored targets measured periodically, and climatic, microseismic, and deformation data collected automatically on daily intervals and archived. In the late 1980s, developmental funding for the monitoring program ceased and some of the installations fell into disrepair. Between May 2004 and September 2006, readings from the remaining functional monitoring points were compiled and interpreted. In addition, readings compiled previously were re-interpreted based on a more recent understanding of short-term movement patterns and climatic influences. These observations were compared with recent observations from an airborne light detection and ranging (LiDAR) digital elevation model and field photographs to give more precise estimates of the overall rates, extent, and patterns of motion for the past 25 years.

scholarly journals Decentralized management of laboratory automation

1994 ◽  
Vol 16 (4) ◽  
pp. 135-137 ◽  
Author(s):  
Don Chambers
Keyword(s):  
Local Control ◽  
Functional Group ◽  
Work Force ◽  
Laboratory Automation ◽  
The Past ◽  
The Future ◽  
Decentralized Management ◽  
Computer Literate ◽  
User Friendly ◽  
Automated Methods

It is generally believed that successful robot users have dedicated centralized robotic groups. While such a generalization holds some merit historically, the availability of newer more user-friendly robots and workstations in recent years and a more computer-literate work force today is changing the way that automation can be managed. Decentralization recognizes robots and workstations as additional tools for all analysts, not a select few. Such an approach initiates involvement and education of more staff with respect to automation. This further ushers the development of automated methods instead of the automation of manually-developed methods. Decentralization also provides local control of resources to address the priorities of a specific functional group within the department. Both a vision of the future, as well as a look at the past, should be considered when determining how to manage robotic and other means of automation. This paper discusses decentralized management of robots as currently applied and envisioned in a large pharmaceutical analytical R & D department.

scholarly journals Introducing QuickChi, a web application for near-global, exploratory, longitudinal river profile analysis

2021 ◽  
Author(s):  
Gregory Ruetenik
Keyword(s):  
Steady State ◽  
Open Source ◽  
Web Application ◽  
Profile Analysis ◽  
Digital Elevation Models ◽  
Global Scale ◽  
Exploratory Analysis ◽  
Tectonic Geomorphology ◽  
The Past ◽  
Digital Elevation

Stream profile analysis has been used extensively in the field of tectonic geomorphology. In the past, exploration of stream profiles, including χ-elevation profiles, has required downloading and processing Digital Elevation Models for specific areas, which limits the scope of exploratory analysis. Presented here is a web application designed to analyze stream profiles at 90m resolution at a near-global scale. Based on the Hydrosheds (Wickel et al., 2007) 90m drainage direction, as well as computed d8 drainage direction and void-filled DEMs, the app allows users to quickly query downstream from selected points anywhere within ±60 degrees latitude, in order to interactively analyze corresponding stream profiles in both distance and χ space, where χ is a metric that is proportional to the presumed steady-state shape of the stream profile (Perron and Royden, 2013). QuickChi is open source, and although currently it is designed as an exploratory tool, more functions can be easily added via community contributions and/or from existing toolsets.

scholarly journals Tradition in Transition: Technology and Change in Archaeological Visualisation Practice

2021 ◽  
Vol 7 (1) ◽  
pp. 1685-1708
Author(s):  
Loes Opgenhaffen
Keyword(s):  
Knowledge Production ◽  
Digital Technology ◽  
Ceramic Production ◽  
The Public ◽  
The Past ◽  
Technology Changes ◽  
Wide Range ◽  
New Knowledge ◽  
The Impact ◽  
Underlying Processes

Abstract Archaeologists are the mediators between fragmented, and often contested, pasts and the momentary present. To record, organise, interpret, and reconstruct complex narratives of the past and to communicate these to present-day peers and the public, they use a wide range of visualisation methods. As such, visualisation methods form an intrinsic part of the representation of practical and intellectual findings, being crucial to knowledge production in archaeology. The adoption and adaptation of digital visualisation technology changes the way archaeologists shape new knowledge. However, for a discipline that is particularly concerned with how technology had an effect on past societies, for example, the impact of the potter’s wheel on local ceramic production strategies, archaeologists have a remarkably limited awareness of how current (digital) technology has an impact on their own visualisation practice and the subsequent knowledge production. This study presents the conceptual framework “tradition in transition,” which integrates technological and visualisation methodologies, and aims to provide a framework to analyse the underlying processes and mechanisms that shape and change the practice of creating visualisations.

scholarly journals Mapping of geological structural features in Lolgorien, Narok County, Kenya: Using hillshade analysis

1970 ◽  
Vol 47 (2) ◽  
pp. 442-456
Author(s):  
Sammy O Ombiro ◽  
Akinade S Olatunji ◽  
Eliud M Mathu ◽  
Taiwo R Ajayi
Keyword(s):  
Structural Features ◽  
Petrographic Analysis ◽  
Srtm Dem ◽  
Banded Iron Formations ◽  
Mining Areas ◽  
The Past ◽  
Digital Elevation ◽  
Geological Map ◽  
Elevation Model ◽  
Iron Formations

Despite Lolgorien being one of the most active gold mining areas in Kenya, it is one of the most geologically understudied areas. To the best knowledge of the authors, Lolgorien geological map was last updated in the 1940s. Current technologies such as remote sensing allow new structural features such as faults to be easily identified. In this regard, this study employed remote sensed data to map structural features found in and around Lolgorien Subcounty, Narok, Kenya. This was done to identify any new structural features that might have been missed in the past. Shuttle Radar 152 Topography Mission Digital Elevation Model (SRTM-DEM) image was downloaded and analysed using hillshade technique. From this analysis, the research identified new structural features which were not included in the current geological map but exist on the ground. One such structural feature (fault) is located approximately at 9866237, 703601 (Universal Transverse Mercator, UTM coordinates) and trends in NW–SE direction. The study also found that most of the lineaments are concentrated in the southern part of Lolgorien area and around or at areas dominated by the banded iron formations. Petrographic analysis of the few samples collected from the area showed presence of gold, pyrite and chalcopyrite mineralisation. Keywords: SRTM-DEM, lineaments, geological structures, hillshade analysis, Lolgorien area  

scholarly journals The role of template matching in the attribution of immorality

2021 ◽  
Author(s):  
Nicolas Restrepo Restrepo Ochoa
Keyword(s):  
Template Matching ◽  
Semantic Space ◽  
Cultural Meaning ◽  
Sociology Of Culture ◽  
Disciplinary Boundaries ◽  
Naturally Occurring ◽  
Moral Wrong ◽  
Sociological Approaches ◽  
Underlying Processes

The sociology of culture provides tools to weigh in on key interdisciplinary debates that hinge around categorization and its underlying processes. For example, at present, there is widespread debate about how individuals come to perceive events as immoral. In this paper, I use sociological approaches to cultural meaning to test one of the leading theories of moral cognition: the idea that individuals attribute immorality through template matching. I use spatial measures of cultural meaning to define and locate a prototypical moral wrong. I then test the theory of template matching, and find evidence that distance from the typical moral transgression - in semantic space - is related to the time it takes to categorize an event as immoral or harmful. I then test these results on a corpus of naturally occurring text to assess their external validity. These studies provide empirical evidence supporting the notion that the attribution of immorality occurs through template matching. Furthermore, they also serve to illustrate that productive conversations can emerge when we take the insights that sociologists of culture and cognition have reached in the past few decades out of our disciplinary boundaries.

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