Results 21 to 30 of about 431 (99)
Validity of distances from the plumbline in sagittal plane deformities: repeatability, correlation with kyphosis angles and normative values [PDF]
Scoliosis, 2009 Methods We performed 4 different studies in 4 different populations of adolescent idiopathic scoliotic and hyperkyphotic patients. In the first study we report the normative data of the plumbline measures in a general population of 180 adolescents. In the second study we compared the sagittal distances from the plumbline of C7, T12 and L3 with the ...
Zaina, F +7 more
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Discussion on the orthometric height realization
Geodesy and Cartography, 2012 In the theory of the orthometric height, the mean value of gravity along the plumbline between the geoid and the earth's surface is defined as the integral mean. To determine the mean gravity from the gravity observations realized at the physical surface
Robert Tenzer
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The recognition and modelling of a backbone and its deformity
Nonlinear Analysis, 2014 In this article the authors present a method for the backbone recognition and modelling. The process of recognition combines some classical techniques (Hough transformation, GVF snakes) with some new (authors present a method for initial curvature ...
Ramūnas Markauskas +3 more
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On the existence of neutral directions of the normal gravity field
Contributions to Geophysics and Geodesy, 2014 A neutral direction of a gravity field is a direction along which the components of the gravity vector remain locally unchanged. A neutral point is a point at which there exists a neutral direction.
Gerassimos MANOUSSAKIS, Paraskevas MILAS
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MODERN METHODS OF DETERMINING PLUMBLINE AND GEOID SURFACE DEFERENCES
Urban development and spatial planningToday, global navigation satellite systems (GNSS) are widely used for the development of national geodetic networks and geodetic research. However, there are some applications where GNSS observations should be integrated with traditional ground-based geodetic measurements (e.g., underground engineering surveys, monitoring of hydraulic structures, etc.)
Oleksandr Honcharenko +3 more
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Advances in Orthopedics, Volume 2018, Issue 1, 2018., 2018 Purpose. A retrospective study that aims to report Adjacent Segment Degeneration (ASD) incidence and spinopelvic balance in short lumbosacral instrumentation for degenerative lumbar spinal stenosis. Although ASD is a common complication following lumbar fusion, the effect of an interspinous spacer (IS) in the supradjacent segment in short lumbosacral ...
Panagiotis Korovessis +5 more
wiley +1 more source
BioMed Research International, Volume 2018, Issue 1, 2018., 2018 Purpose. To investigate the natural history of distal adding‐on in adolescent idiopathic scoliosis (AIS) and to identify risk factors for its progression. Methods. Sixty‐one AIS patients with distal adding‐on occurrence were included. We further classify distal adding‐on into progressive and nonprogressive group according to its natural evolution.
Xiaodong Qin +7 more
wiley +1 more source
CORRECTION TO HELMERT'S ORTHOMETRIC HEIGHT DUE TO ACTUAL LATERAL VARIATION OF TOPOGRAPHICAL DENSITY [PDF]
Revista Brasileira de Cartografia, 2003 Helmert (1890) used Poincaré-Prey's gravity gradient for the definition of the orthometric height. According to this approach the gravity value needed for the evaluation of the height is obtained from the observed gravity at the earth surface reduced to ...
Petr Vanícek, Robert Tenzer
doaj
Advances in Orthopedics, Volume 2018, Issue 1, 2018., 2018 Objective. Detection of a lateral shift (LS) in patients with diagnosed disc herniation compared to healthy controls. Summary of Background Data. A specific lateral shift (LS) pattern is observed in patients with disc herniation and low back pain, as shown in earlier studies. Methods. Rasterstereography (RS) was used to investigate the LS.
Britta K. Krautwurst +5 more
wiley +1 more source
Natural Sciences Education, Volume 46, Issue 1, Page 1-9, December 2017., 2017 Core Ideas Watershed is an important concept in science and engineering of natural resources. Introducing watershed concept using a leaf that students see every day is novel. Using leaf analogy, watershed concept can be taught universally. This article examines the effects of using leaves, something most students see every day and have some familiarity
Aavudai Anandhi +2 more
wiley +1 more source