scholarly journals Side-hops challenge knee control in the frontal and transversal plane more than hops for distance or height among ACL-reconstructed individuals

2021 ◽  
pp. 1-18
Author(s):  
Jonas L. Markström ◽  
Eva Tengman ◽  
Charlotte K. Häger
Keyword(s):  
Transversal Plane

scholarly journals EXTENSION OF THE POINCARÉ GROUP AND NON-ABELIAN TENSOR GAUGE FIELDS

2010 ◽  
Vol 25 (31) ◽  
pp. 5765-5785 ◽  
Author(s):  
GEORGE SAVVIDY
Keyword(s):  
Gauge Group ◽  
Gauge Transformation ◽  
Space Time ◽  
Gauge Fields ◽  
Poincaré Group ◽  
Matrix Representations ◽  
Poincare Group ◽  
Yang Mills ◽  
The Matrix ◽  
Transversal Plane

In the recently proposed generalization of the Yang–Mills theory, the group of gauge transformation gets essentially enlarged. This enlargement involves a mixture of the internal and space–time symmetries. The resulting group is an extension of the Poincaré group with infinitely many generators which carry internal and space–time indices. The matrix representations of the extended Poincaré generators are expressible in terms of Pauli–Lubanski vector in one case and in terms of its invariant derivative in another. In the later case the generators of the gauge group are transversal to the momentum and are projecting the non-Abelian tensor gauge fields into the transversal plane, keeping only their positively definite spacelike components.

Floral development of two species of Stylidium (Stylidiaceae) and some remarks on the systematic position of the family Stylidiaceae

1992 ◽  
Vol 70 (2) ◽  
pp. 258-271 ◽  
Author(s):  
Claudia Erbar
Keyword(s):  
Key Words ◽  
Floral Development ◽  
Floral Biology ◽  
Systematic Position ◽  
Inferior Ovary ◽  
Stamen Primordia ◽  
Floral Apex ◽  
The Family ◽  
Transversal Plane

The early floral development of Stylidium adnatum and Stylidium graminifolium is characterized by an initial circular primordium whose areas in the transversal plane of the floral primordium show enhanced growth. The spiral inception of the five sepals starts before the differentiation of the initial circular primordium into two stamen primordia in transversal position (in relation to the floral diagram) and the corolla ring primordium below the stamen primordia. Then five petal primordia, which alternate with the sepals, arise on the corolla ring primordium (early sympetaly). Peculiar to the flowers of Stylidiaceae is the column that bears at its top both stigma and anthers. Probably this column should be interpreted as a receptacular tube. No distinct carpel primordia have been observed. The inferior ovary results from intercalary growth in the peripheral parts of the receptacle below the calyx, corolla, and stamen primordia. The residual floral apex gives rise to a transversal septum, by which the ovary becomes bilocular. None of the morphological, palynological, and embryological characters discussed contradicts a position of the Stylidiaceae near the Campanulales, and several of these characters support this position. Key words: Stylidiaceae, Campanulales, floral development, systematic position, floral biology.

Free moment patterns, transversal plane joint loading and injury risk in running

2015 ◽  
Vol 7 (sup1) ◽  
pp. S124-S126 ◽  
Author(s):  
Steffen Willwacher ◽  
Katina Fischer ◽  
Irena Goetze ◽  
Joseph Hamill ◽  
Eric Rohr ◽  
...  
Keyword(s):  
Injury Risk ◽  
Joint Loading ◽  
Transversal Plane ◽  
Plane Joint ◽  
Free Moment

Changes in the perceived head transversal plane and the subjective visual horizontal induced by Coriolis stimulation during gondola centrifugation

2006 ◽  
Vol 16 (3) ◽  
pp. 105-116
Author(s):  
Arne Tribukait ◽  
Ola Eiken
Keyword(s):  
Semicircular Canals ◽  
Angular Speed ◽  
Head Movements ◽  
Otolith Organs ◽  
Gravitoinertial Force ◽  
Roll Velocity ◽  
Transversal Plane ◽  
Upright Head ◽  
The Right ◽  
Otolith System

For studying the influence of the vertical semicircular canals on spatial orientation in roll, the subjective visual horizontal (SVH) and the subjective transversal plane of the head (STP) were measured in a situation where the vertical canals sense a roll-velocity stimulus while the otolith organs persistently signal that the head is upright in roll. During gondola centrifugation (resultant gravitoinertial force vector 2.5 G, gondola inclination 66 degrees) subjects were exposed to controlled rotational head movements (angular speed 27 degrees/s, magnitude 40 degrees) about the yaw (body z-) axis, produced by means of a motor-driven helmet. This causes a roll-plane Coriolis stimulus to the canals, while the otoliths persistently sense upright head position in roll. The subjects reported intense sensations of rotation and tilt in the roll plane. This was reflected in tilts of both the SVH and STP. The initial tilt of the SVH was 13.0 ± 9.7 degrees (mean ± S.D., n=10). {The STP was changed in the opposite direction}. The initial tilt was 23.8 ± 12.2 degrees (mean ± S.D., n=5). {The changes in the SVH and STP were not of equal magnitude.} A few subjects who had almost no deviations in the SVH showed pronounced tilts of the STP. The time constant for exponential decay of the tilts of the SVH and STP was on average approximately 1 minute. These findings indicate that a difference in activity of the vertical canals in the right versus left ear may cause substantial tilts of the SVH even if there is no asymmetry in the activity of the otolith system. Further, the canal stimulus may induce a tilt of the fundamental egocentric frame of reference.

Retention period in children with crossbite

2021 ◽  
Vol 21 (2) ◽  
pp. 118-121
Author(s):  
V. M. Vodolatsky ◽  
R. S. Makatov
Keyword(s):  
Orthodontic Treatment ◽  
Orthodontic Appliances ◽  
Retention Period ◽  
Fixed Orthodontic Appliances ◽  
Transversal Plane ◽  
Group 2 ◽  
Design Characteristics ◽  
Group 1

Relevance. Crossbite is a deformation of the dentoskeletal system in the horizontal (transversal) plane, and it results from a discrepancy between the width of the upper and lower dental arches in the anterior or posterior dentition.Crossbite can arise as an isolated condition, and then it is an independent de-formation of the dentoskeletal system. In some cases, a crossbite is combined with a wrong arch-to-arch relationship in the sagittal and vertical planes.The aim was to analyze the duration of the retention period in children with crossbite after the orthodontic treatment.Materials and methods. We orthodontically treated 18 children with crossbite aged 7 to 18 years. All patients were divided into 2 groups. Group 1 included 14 children from 7 to 14 years old with unilateral crossbite (right-sided – 6, left-sided – 8). Group 2 included 4 children from 9 to 18 years old with bilateral crossbite. All 18 children had a buccal crossbite. All patients underwent orthodontic treatment with removable and fixed orthodontic appliances.Results. The retention period after the orthodontic treatment of crossbite lasted 6-9 months.Conclusions. The analysis demonstrated that the retention period after the orthodontic treatment in children with crossbite averaged 6-9 months. The design characteristics of the or-thodontic appliances did not affect the duration of the retention period in children with crossbite.

scholarly journals ROTATION JOINTS FRICTION IN A TRANSVERSAL MOBILE COUPLING

2021 ◽  
Vol 13 (3) ◽  
pp. 54-58
Author(s):  
Cornel Catalin Gavrila ◽  
◽  
Mihai Lates ◽  
Keyword(s):  
Friction Coefficient ◽  
Dynamic Behaviour ◽  
Important Influence ◽  
Final Part ◽  
Relative Movement ◽  
Torque Transmission ◽  
Transversal Plane ◽  
Parallel Axis

The transversal mobile couplings are used in movement and torque transmission between two main shafts having parallel axis, with the possibility to undertake misalignments in the transversal plane. These shaft misalignments are usually named transversal movements. The paper presents, starting from some kinematic aspects regarding relative movements between the coupling parts, the kinematic equations useful in determining position of the intermediary elements, depending by the transversal misalignments. Following this, using the inside relative movement in rotation joints between parts and corresponding adequate materials, the friction coefficient is studied. The friction which appears in coupling’s rotation joints between the involved parts has an important influence on their dynamic behaviour, wear and lifetime. The most significant friction and also wear is given by the alternant rotation movements in joints between parts, at the ends of their angular stroke. Due to this, the study of the friction between some materials to be used in coupling manufacturing is required, but also difficult because of some particularities, as reduced rotation in joints, for reduced transversal misalignments between the main shafts. There are presented, in the paper final part, the results and conclusions.

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