Search results for "Principle"

Radiation effects on light scattering and cataract formation in the lenses of interventional radiologist and cardiologists

2014

Purpose There is little information about exposure to dosages below 500 mSv. This pilot study aimed at investigating the effects of low dose radiation on lens transparency in occupationally exposed interventional cardiologists and radiologists. Methods Physicians who have performed fluoroscopically guided procedures for at least 5 years were recruited in the areas of Cologne-Bonn and Rhine-Main together with their non-exposed colleagues. A questionnaire has been developed to estimate occupational exposure. Exclusion criteria comprised corticosteroid treatment, radiotherapy, chemotherapy and glaucoma. Changes in lens transparency and cataract formation were determined by slit lamp microscopy…

Association of Birth Weight with Central and Peripheral Corneal Thickness in Adulthood-Results from the Population-Based German Gutenberg Health Stud…

2021

Low birth weight (BW) is associated with altered ocular geometry such as a steeper corneal shape in adulthood. However, it is unclear whether low birth weight affects corneal thickness development in the center or periphery in adulthood which may contribute to ocular disease. The purpose of this study was to investigate corneal thickness in former low birth weight individuals in adulthood. Methods: The German Gutenberg Health Study is a prospective, population-based study in which every participant (age range 40–80 years) was measured with Scheimpflug imaging (Pentacam HR, Oculus Optikgeräte GmbH, Wetzlar, Germany). BW was collected by self-reports. The relationship between birth weight and…

Postoperative Lens Position Preoperatively Determined by Scheimpflug Photography

1999

The position of the artificial lens has an important influence on refractive power calculation. We compared the position of the crystalline lens with that of the artificial lens after cataract surgery by means of Scheimpflug photography. A difference in position of approximately 0.8 mm in the anterior direction could be determined.

Objective assessment of cataract: Comparison between the Lens Opacities Classification System III and a Scheimpflug camera

2015

Purpose Develop an automatic system for cataract classification using the Sirius Scheimpflug for both nuclear and cortical cataract. Methods Scheimpflug images were taken using the Sirius system in 50 patients with nuclear and/or cortical cataract (mean age 69 ± 9.2 years). The nuclear opacity (NO) and cortical opacity was graded by an ophthalmologist according to the Lens Opacities Classification System (LOCSIII) by comparing the slit-lamp image with the LOCS's standard nuclear images. A custom-made MATLAB program was used to calculate the pixel intensity value within a region of interest (ROI) of the nucleus and to calculate the percentage of opaque pixels in the cortex. Results Eighty-ni…

Interhemispheric inhibition during mental actions of different complexity.

2013

International audience; Several investigations suggest that actual and mental actions trigger similar neural substrates. Yet, neurophysiological evidences on the nature of interhemispheric interactions during mental movements are still meagre. Here, we asked whether the content of mental images, investigated by task complexity, is finely represented in the inhibitory interactions between the two primary motor cortices (M1s). Subjects' left M1 was stimulated by means of transcranial magnetic stimulation (TMS) while they were performing actual or mental movements of increasing complexity with their right hand and exerting a maximum isometric force with their left thumb and index. Thus, we sim…

DAC 6, efficacia dell’accertamento tributario e trasparenza: fino a che punto sono legittimi i doveri di disclosure?

2021

I molteplici interventi sull’originaria struttura della direttiva DAC hanno comportato un notevole ampliamento degli obblighi di informazione fiscalmente rilevanti tanto sotto il profilo soggettivo (ampliamento della platea degli obbligati), quanto sotto quello oggettivo (ampliamento degli obblighi). Ciò induce, in prima battuta, a chiedersi quali possano essere i beni o interessi giuridici tutelati dallo scambio automatico di informazioni fiscalmente rilevanti nel contesto internazionale. Ma induce altresì a domandarsi entro quale misura la tutela di quei beni ed interessi possa legittimare un obbligo di disclosure che attiene non ad un piano domestico dei rapporti fra l’obbligato ed il pr…

Towards a FAIR Sharing of Scientific Experiments: Improving Discoverability and Reusability of Dielectric Measurements of Biological Tissues

2018

Zasada pozytywnej dyskryminacji mniejszości narodowych w ujęciu teoretycznym i praktyce ustrojowej

2018

CEL NAUKOWY: Celem artykułu jest zbadanie teoretycznych aspektów zasady pozytywnej dyskryminacji, ustrojowych uwarunkowań jej zastosowania w odniesieniu do mniejszości narodowych w Polsce oraz dziedzin, w których może być realizowana. PROBLEM I METODY BADAWCZE: Zagadnienie pozytywnej dyskryminacji znajduje się w obrębie zainteresowania przedstawicieli wielu nauk i idealnie wpasowuje się w koncepcję demokracji ujmowanej jako wartości, procedury i w sensie substancjalnym. Nie jest ona przy tym ochroną antydyskryminacyjną, lecz jej wsparciem, promotorem równości formalnej i faktycznej. W Polsce, choć odsetek mniejszości narodowych jest nikły, pozytywna dyskryminacja ma rangę zasady w Konstytuc…

Spatial Cognition 2020/1: Book of abstracts : August 2-4, 2021, University of Latvia

2021

Spatial Cognition is concerned with the acquisition, development, representation, organization, and use of knowledge about spatial objects in real, virtual or hybrid environments and processed by human or artificial agents. Spatial Cognition includes research from different fields insofar as they are concerned with cognitive agents and space, such as cognitive and developmental psychology, linguistics, computer science, geography, cartography, philosophy, neuroscience, and education. Research issues in the field range from the investigation of human spatial cognition to mobile robot navigation, including topics such as wayfinding, spatial planning, spatial learning, internal and external re…

Constant Power Model in Arm Rotation—A New Approach to Hill’s Equation

2014

The purpose of this study was to further develop the constant power model of a previous study and to provide the final solution of Hill’s force-velocity equation. Forearm and whole arm rotations of three different subjects were performed downwards (elbow and shoulder extension) and upwards (elbow and shoulder flexion) with maximum velocity. These arm rotations were recorded with a special camera system and the theoretically derived model of constant maximum power was fitted to the experimentally measured data. The moment of inertia of the arm sectors was calculated using immersion technique for determining accurate values of friction coefficients of elbow and whole arm rotations. The experi…