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Virtual Work01:20

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The principle of virtual work states that if a body is in static and dynamic equilibrium, then the sum of all the virtual work done by all external forces and couple moments for any given virtual displacement must be zero.
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The alignment of a road line using Geographic Information Systems (GIS) is a critical process in civil engineering, combining advanced technology with practical decision-making. This methodology begins with the collection of geospatial data, including information on land cover, geomorphology, drainage patterns, slope, and contour details. Such data is typically acquired through satellite imagery and GIS tools, offering a comprehensive understanding of the terrain.Once the data is gathered, it...
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Principle of Virtual Work: Problem Solving01:13

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The principle of virtual work is an essential concept in the field of mechanics and engineering. This is used to solve problems related to the equilibrium of a structure or system. It is based on the assumption that if a system is in equilibrium, the work done by all the forces during a virtual displacement is zero. This principle is applied by considering virtual displacements of the system and the corresponding work done by internal and external forces.
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Virtual Work for a System of Connected Rigid Bodies01:06

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Virtual work is a powerful method used to solve problems involving several connected rigid bodies. When the system is in equilibrium, virtual work is zero. This allows the calculation of the resulting forces when a system undergoes a virtual displacement. When attempting to analyze such a system, first, use a free-body diagram, where an independent coordinate represents the configuration of the links, and mark its deflected position resulting from the positive virtual displacement.
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Impression Management Techniques III: Aligning Actions01:29

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Aligning actions are communicative strategies individuals employ to maintain social harmony and preserve personal identity in the face of potential disruptions to social norms. These actions are particularly important in managing social impressions when one's behavior might be seen as inappropriate, incompetent, or morally questionable.Types of Aligning ActionsThe three principal types of aligning actions are disclaimers, accounts, and apologies.DisclaimersDisclaimers are preventive; they are...
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A New Tool for Digital Alignment in Virtual Anthropology.

Antonio Profico1, Costantino Buzi1, Christopher Davis2

  • 1Dipartimento di Biologia Ambientale, Sapienza Università di Roma, Rome, Italy.

Anatomical Record (Hoboken, N.J. : 2007)
|February 8, 2019
PubMed
Summary

A new software, Digital Tool for Alignment (DTA), semi-automatically aligns fragmented fossil remains using shape data. It proves efficient, especially with phylogenetically related specimens, offering a faster alternative to manual methods in virtual anthropology.

Keywords:
Homo neanderthalensisRfossilgeometric morphometricsprimatesvirtual restoration

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Area of Science:

  • Paleoanthropology
  • Virtual Anthropology
  • Computational Biology

Background:

  • Fossil record analysis is crucial for understanding evolutionary trait development.
  • Taphonomic processes often fragment or deform fossil remains, necessitating realignment for accurate shape interpretation.
  • Virtual anthropology utilizes digital models for reconstructing fossil specimens.

Purpose of the Study:

  • To introduce Digital Tool for Alignment (DTA), a novel semi-automatic R software for aligning disarticulated fossil remains.
  • To evaluate DTA's alignment performance using digital models of primate skulls, a simulated human skull, and a real fossil specimen.
  • To assess factors influencing alignment accuracy, including phylogenetic proximity, sex, and body size.

Main Methods:

  • Developed DTA software utilizing shape information from reference samples for alignment.
  • Tested DTA on 14 primate species, a simulated Homo sapiens skull, and the Amud 1 (Homo neanderthalensis) fossil.
  • Compared DTA's performance against manual alignment methods and analyzed alignment quality based on phylogenetic proximity, sex, and body size.

Main Results:

  • Phylogenetic proximity was identified as the most significant factor for efficient fossil alignment.
  • Sex and allometric effects were found to influence alignment, suggesting their importance in reference model selection.
  • DTA demonstrated comparable or superior performance to manual alignments, being faster and requiring less specialized anatomical expertise.

Conclusions:

  • DTA offers an efficient, semi-automatic solution for aligning fragmented fossil remains in virtual anthropology.
  • The software reduces the need for extensive anatomical knowledge and speeds up the analysis process.
  • Alignment accuracy is influenced by the phylogenetic relationship between the reference and target specimens, as well as potential sex and allometric variations.