New method of three-dimensional analysis of bipedal locomotion for the study of displacements of the body and body-parts centers of mass in man and non-human primates: Evolutionary framework

1993 ◽  
Vol 90 (4) ◽  
pp. 455-476 ◽  
Author(s):  
Christine Tardieu ◽  
André Aurengo ◽  
Bernard Tardieu
Keyword(s):  
Dimensional Analysis ◽  
Three Dimensional ◽  
The Body ◽  
New Method ◽  
Bipedal Locomotion ◽  
Body Parts ◽  
Centers Of Mass

scholarly journals CALS Technologies in Mechanical Engineering Using the Example of Developing Three-Dimensional Models of Typical Products

2020 ◽  
Vol 26 (4) ◽  
pp. 637-649
Author(s):  
A. A. Popova ◽  
◽  
I. N. Shubin ◽  
R. E. Aliev ◽  
◽  
...  
Keyword(s):  
Complex Structure ◽  
Three Dimensional ◽  
3D Models ◽  
Machine Building ◽  
The Body ◽  
Body Parts ◽  
3D Cad ◽  
Cad System ◽  
Dimensional Models ◽  
Three Dimensional Models

Three-dimensional models of the body parts were developed using the basic 3D modeling operations (rotation, extrusion, threading, etc.) of the T-FLEX CAD 3D CAD system, which made it possible to significantly simplify the work with assembly 3D models representing a complex structure consisting of a large number of parts. During the trial operation, the advantages of using the T-FLEX CAD 3D CAD system have been proven when working with complex 3D models. The advantages of using the program in the machine-building cluster are shown.

scholarly journals Countershading enhances camouflage by reducing prey contrast

2020 ◽  
Vol 287 (1927) ◽  
pp. 20200477
Author(s):  
Callum G. Donohue ◽  
Jan M. Hemmi ◽  
Jennifer L. Kelley
Keyword(s):  
Body Shape ◽  
Three Dimensional ◽  
Luminance Contrast ◽  
The Body ◽  
Body Parts ◽  
Live Fish ◽  
Average Luminance ◽  
Fish Predators ◽  
Dimensional Shape ◽  
Three Dimensional Shape

A three-dimensional body shape is problematic for camouflage because overhead lighting produces a luminance gradient across the body's surface. Countershading, a form of patterning where animals are darkest on their uppermost surface, is thought to counteract this luminance gradient and enhance concealment, but the mechanisms of protection remain unclear. Surprisingly, no study has examined how countershading alters prey contrast, or investigated how the presence of a dorsoventral luminance gradient affects detection under controlled viewing conditions. It has also been suggested that the direction of the dorsoventral luminance gradient (darkest or lightest on top) may interfere with predators' abilities to resolve prey's three-dimensional shape, yet this intriguing idea has never been tested. We used live fish predators (western rainbowfish, Melanotaenia australis ) and computer-generated prey images to compare the detectability of uniformly pigmented (i.e. non-countershaded) prey with that of optimally countershaded prey of varying contrasts against the background. Optimally countershaded prey were difficult for predators to detect, and the probability and speed of detection depended on prey luminance contrast with the background. In comparison, non-countershaded prey were always highly detectable, even though their average luminance closely matched the luminance of the background. Our findings suggest that uniformly pigmented three-dimensional prey are highly conspicuous to predators because overhead lighting increases luminance contrast between different body parts or between the body and the background. We found no evidence for the notion that countershading interferes with predator perception of three-dimensional form.

A Biomechanical Analysis of Manual Materials Handling Tasks in Restricted Working Postures

1988 ◽  
Vol 32 (11) ◽  
pp. 670-674 ◽  
Author(s):  
Sean Gallagher ◽  
Richard L. Unger
Keyword(s):  
Lumbar Spine ◽  
Three Dimensional ◽  
The Body ◽  
Biomechanical Analysis ◽  
Body Type ◽  
Materials Handling ◽  
The Subject ◽  
Kneeling Work ◽  
Centers Of Mass ◽  
Three Dimensional Coordinate

The U. S. Bureau of Mines has developed a biomechanical modeling system to examine the stresses on the lumbar spine when lifting in stooped and kneeling work postures utilized by low-seam underground coal miners. This system allows Bureau researchers to digitize two videotaped views (frontal and sagittal) of underground miners performing various lifting tasks under laboratory conditions. These points are then translated into a three-dimensional coordinate system, and a link man (developed from known anthropometry of the subject) is fitted to the 3-D coordinates. The centers of mass for the various links are calculated according to the body type (rotund, muscular, thin, or median) of the subject. Compression results were estimated using a linear programming internal/external load model. The location of the L3 vertebral body center was calculated based upon anthropometric data and morphometric studies of the lumbar spine. Results of the compression and shear force analyses for restricted lifting postures are presented and discussed.

scholarly journals Biomechanical factor affecting Baseball Pitching Velocity

2019 ◽  
Author(s):  
Yasushi Ota ◽  
Ryoga Kuriyama
Keyword(s):  
High Speed ◽  
Time Series Data ◽  
Three Dimensional ◽  
The Body ◽  
Lower Limbs ◽  
Whole Body ◽  
Series Data ◽  
Physical Factors ◽  
Body Parts ◽  
Joint Force

In baseball, pitchers have a central role and high-speed pitching is desirable. So far, several studies of the physical factors related to pitching form with the aim of improving the speed of pitched balls have been conducted. In this study, we used a motion capture to acquire three-dimensional (3D) time series data related to the speed of pitched balls and performed a kinetics analysis by using these acquired data. The acquired data were divided into five pitching phases: wind up, early cocking, late cocking, acceleration, and follow through. Our analysis identified the body parts that contribute to increasing the speed of pitched balls, i.e., the speed of rotation of individual joints and the timing/phase when power can be applied. Especially, by examining joint angular velocity and joint force, we showed that the speed of pitched balls is determined by the action of the upper limbs as well as the coordinated action of the whole body, particularly the lower limbs and the trunk.

scholarly journals Bedsores Management: Efficiency Simulation of a New Mattress Design

Healthcare ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 1701
Author(s):  
Abdullatif Alwasel ◽  
Bandar Alossimi ◽  
Maha Alsadun ◽  
Khalid Alhussaini
Keyword(s):  
Surface Area ◽  
Three Dimensional ◽  
The Body ◽  
Absolute Amount ◽  
Body Parts ◽  
Health It ◽  
Original Design ◽  
Element Analysis ◽  
Limited Mobility ◽  
Three Dimensional Models

Bedsores, also known as pressure ulcers, are wounds caused by the applied external force (pressure) on body segments, thereby preventing blood supply from delivering the required elements to the skin tissue. Missing elements hinder the skin’s ability to maintain its health. It poses a significant threat to patients that have limited mobility. A new patented mattress design and alternative suggested designs aimed to reduce pressure are investigated in this paper for their performance in decreasing pressure. A simulation using Ansys finite element analysis (FEA) is carried out for comparison. Three-dimensional models are designed and tested in the simulation for a mattress and human anthropometric segments (Torso and Hip). All designs are carried out in solidworks. Results show that the original design can redistribute the pressure and decrease it up to 17% less than the normal mattress. The original design shows better ability to decrease the absolute amount of pressure on the body. However, increasing the surface area of the movable parts results in less pressure applied to the body parts. Thus, this work suggests changing the surface area of the cubes from 25 to 100 cm2.

scholarly journals Development of three-dimensional physiological function imaging of biological body by transillumination imaging using near infrared light - preliminary research -

10.29007/dvzs ◽  
2020 ◽  
Author(s):  
Ngoc An Dang Nguyen ◽  
Phuong Anh Bui ◽  
Anh Tu Tran ◽  
Trung An Dang Nguyen ◽  
Van Chinh Nguyen ◽  
...  
Keyword(s):  
Near Infrared ◽  
Physiological Function ◽  
Imaging Modality ◽  
Three Dimensional ◽  
The Body ◽  
Infrared Light ◽  
Body Parts ◽  
Two Dimensional ◽  
Animal Body ◽  
Preliminary Research

In biological tissue, there are different kinds of endogenous chromophores. Their absorption spectra in the optical range are sensitive to the physiological change of the animal body. In the near-infrared region (700-1200 nm wavelength), hemoglobin has a characteristic absorption spectrum which is dependent on its redox state. Therefore, the functional information inside the animal body could be obtained noninvasively by measuring the transmitted light. By detecting the change of the absorption characteristics of the animal body, the functional change inside the body can be detected in a two-dimensional transillumination image. In this paper, we propose preliminary research on developing a novel imaging modality of biological body parts. Using the two-dimensional images obtained in many different orientations, three-dimensional physiological function imaging of the biological body by transillumination could be expected. This paper presents a preliminary result in the experiment to show the feasibility of this technique.

Tapping into the senses: Corporeality and immanence in The Piano Tuner of EarthQuakes (Quay Brothers, 2005)

2019 ◽  
Vol 10 (2) ◽  
pp. 151-166
Author(s):  
Fátima Chinita
Keyword(s):  
Artificial Life ◽  
Three Dimensional ◽  
Physical Reality ◽  
The Body ◽  
Body Parts ◽  
Mise En Abyme ◽  
Body Without Organs ◽  
The Senses ◽  
The Spectator ◽  
The Relationship

Abstract In The Piano Tuner of EarthQuakes (2006), the Quay Brothers' second feature, the sensual form and the meta-artistic content are truly interweaved, and the siblings' staple animated materials become part of the theme itself. Using Michel Serres's argument in Les cinq sens (2014, whose subtitle in English is A Philosophy of Mingled Bodies), I address the relationship between the Quays intermedial animation and the way the art forms of music, painting, theatre and sculpture are used to captivate the film viewer's sensorium in the same way that some of the characters are fascinated by the evil Droz, a scientist and failed composer who manipulates machines and people alike, among them Felisberto, a meek piano tuner with the ability to stir the natural elements. I further proceed to posit the entire film as an intended allegory of animation on the Quays part. Their haptic construction of a three-dimensional world which they control artistically is replicated in the film in Droz's and Felisberto's activities vis-à-vis Malvina van Stille, an abducted opera diva who is kept in a suspended animation state (just like a marionette) and several hydraulic automata with musical resounding properties, some of them made up of an uncanny assortment of body parts. The artificial life of these creatures is contrasted, in two ways, with their physical reality as beings that exist in the world: first, via Serres's sensorial strategy to transform a body into a conscious entity (i.e., endowed with a soul), an embodiment I call 'Corpo-Reality', and second, by resorting to Deleuze and Guattari's theory of the body without organs (BwO) in its advocacy of 'hard' nature and the rejection of a rigid assortment of body parts (either biological or social). The paradoxical organic objectivity of the 'marionettized' Malvina is pitted against the seemingly subjective doings of the mechanical automata, especially an android woodcutter. However, just as in the story things are not what they seem, and the automata actually reflect the 'real' world of Felisberto's tuning of them (and vice versa, in a process entitled 'vertical mise en abyme'), so the film itself can be a 'crystal-image' (per Deleuze), offering itself to the senses of the spectator.

scholarly journals Structure encoding in DNA

2019 ◽  
Author(s):  
Antony Van der Mude
Keyword(s):  
Fine Structure ◽  
Three Dimensional ◽  
Body Part ◽  
Cellular Level ◽  
The Body ◽  
Local Context ◽  
Body Parts ◽  
Cell Type ◽  
Regulatory Cascade ◽  
Non Coding Rna

It is proposed that transposons and related long non–coding RNA define the fine structure of body parts. Although morphogens have long been known to direct the formation of many gross structures in early embryonic development, they do not have the necessary precision to define a structure down to the individual cellular level. Using the distinction between procedural and declarative knowledge in information processing as an analogy, it is hypothesized that DNA encodes fine structure in a manner that is different from the genetic code for proteins. The hypothesis states that repeated or near–repeated sequences that are in transposons and non–coding RNA define body part structures. As the cells in a body part go through the epigenetic process of differentiation, the action of methylation serves to inactivate all but the relevant structure definitions and some associated cell type genes. The transposons left active will then physically modify the DNA sequence in the heterochromatin to establish the local context in the three–dimensional body part structure. This brings the encoded definition of the cell type to the histone. The histone code for that cell type starts the regulatory cascade that turns on the genes associated with that particular type of cell, transforming it from a multipotent cell to a fully differentiated cell. This mechanism creates structures in the musculoskeletal system, the organs of the body, the major parts of the brain, and other systems.

scholarly journals Coincident disruptive coloration

2008 ◽  
Vol 364 (1516) ◽  
pp. 489-496 ◽  
Author(s):  
Innes C Cuthill ◽  
Aron Székely
Keyword(s):  
Field Experiments ◽  
Three Dimensional ◽  
The Body ◽  
Body Parts ◽  
Effective Mechanism ◽  
General Outline ◽  
Body Form ◽  
Disruptive Coloration ◽  
Characteristic Features ◽  
Colour Patterns

Even if an animal matches its surroundings perfectly in colour and texture, any mismatch between the spatial phase of its pattern and that of the background, or shadow created by its three-dimensional relief, is potentially revealing. Nevertheless, for camouflage to be fully broken, the shape must be recognizable. Disruptive coloration acts against object recognition by the use of high-contrast internal colour boundaries to break up shape and form. As well as the general outline, characteristic features such as eyes and limbs must also be concealed; this can be achieved by having the colour patterns on different, but adjacent, body parts aligned to match each other (i.e. in phase). Such ‘coincident disruptive coloration’ ensures that there is no phase disjunction where body parts meet, and causes different sections of the body to blend perceptually. We tested this theory using field experiments with predation by wild birds on artificial moth-like targets, whose wings and (edible pastry) bodies had colour patterns that were variously coincident or not. We also carried out an experiment with humans searching for analogous targets on a computer screen. Both experiments show that coincident disruptive coloration is an effective mechanism for concealing an otherwise revealing body form.

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