Search results for "contrast"

Visual quality with corneo-scleral contact lenses for keratoconus management

2018

Purpose: To assess the visual quality achieved by fitting corneo-scleral contact lenses (CScL) for keratoconus management. Methods: Thirty patients with keratoconus presented to have CScL fitted because of the unsatisfactory visual quality they experienced with their contact lenses or spectacles. The eye examination included visual acuity assessment, anterior eye biomicroscopy, ocular fundus examination, corneal topographic analysis, endothelialcell count, contrast sensitivity and aberrometry. The fitting process was performed using a diagnostic trial set. Subjective visual quality and comfort, and contact lens wear time were also reported. Patients were monitored for one year. Results: Thr…

Kontrastmittel-Kurzinfusion oder -Bolusinjektion bei der i.v. Urographie

1993

The rate of contrast injection during i.v. urography may vary considerably (bolus injection or drip infusion). The effect of 5 rates of injection (6, 12, 18, 36 and 72 ml/min) on the contrast density in the renal collecting system was examined over a period of 30 minutes. Measurements showed an inter-individual difference of more than 200% in each group. The intra-individual variations for different rates of injection were very slight; individual concentration in the kidney for a given dose depends only slightly on the rate of injection. There is no statistically significant improvement in contrast values as a result of a bolus injection. The reduced incidence of side effects justifies the …

Gait Analysis Using Multiple Kinect Sensors

2014

A gait analysis technique to model user presences in an office scenario is presented in this chapter. In contrast with other approaches, we use unobtrusive sensors, i.e., an array of Kinect devices, to detect some features of interest. In particular, the position and the spatio-temporal evolution of some skeletal joints are used to define a set of gait features, which can be either static (e.g., person height) or dynamic (e.g., gait cycle duration). Data captured by multiple Kinects is merged to detect dynamic features in a longer walk sequence. The approach proposed here was been evaluated by using three classifiers (SVM, KNN, Naive Bayes) on different feature subsets.

Reconciling the Evidence on the Knowledge-capital Model

2005

The Knowledge Capital Model (KC-model), described in Markusen (2002), encompasses both market size (horizontal) as well as factor endowment (vertical) explanations to why multinational production occurs. Although the KC-model seems intuitively appealing, the empirical support has, so far, been weak and even confused. In this study, we find strong, robust and consistent support for the KC-model. In contrast to previous studies, our skill measures follow directly from the model. We also use an enlarged dataset, where the data coverage is significantly improved. Our results also give estimated surfaces remarkably similar to theoretical simulations of the KC-model. In addition, the results give…

Joint Venture, an Alternative for Knowledge Learning

2012

Joint venture as a form of business cooperation is a valid alternative for acquiring external knowledge and particularly so when it is unavailable on the market. Joint venture constitutes an interesting instrument for learning in firms that belong to high technology sectors; it not only enables access to learning but can also help its assimilation and even its subsequent application to new uses. To analyze this learning, we focus on the elements that make it up, the nature of transferred knowledge, communication between partners, the motivation of the partner to learn, and lastly, the context in which this occurs, such as the type of organizational structure of the partner firm. We obtained…

LINGÜíSTICA DIDÁCTICA DEL ESPAÑOL PARA ITALIANOS:UNA SINERGIA ENTRE INTERCOMPRENSIÓN Y CONTRASTIVIDAD

2017

The objective of this article is to present Intercomprehension as a further input for an epiphany of the adquisition process of Spanish as L2. In fact, this discipline, together with the enactivism, constitute the substratum on which our hypothesis of creation of a contrastive-perceptive linguistics is based, a blended methodology, an integrated method for the development of a linguistic competence of Spanish L2.

Étude comparative du futur simple dans un corpus littéraire finno-français

2008

Lanthanide complexes as imaging agents anchored on nano-sized particles of boehmite

2011

International audience; The synthesis of boehmite nanoparticles modified with lanthanides (Eu, Tb and Gd) is described. Their synthesis, characterization and in vitro assays with HeLa cells were performed. The nuclear magnetic relaxation dispersion (NMRD) profiles of the two chelating moieties were studied. Imaging data from laser scanning confocal fluorescence microscopy and flow cytometry revealed that the nanoscaffolds were taken up by the cells, distributed throughout the cytoplasm and showed no toxicity. This platform could represent an alternative to silica-based inert matrices as imaging vehicles.

Breakdown in Multilateral Negotiations

2015

Abstract We analyze a complete information multilateral bargaining model in which a buyer is to purchase two complementary goods from two sellers. Binding cash-offer contracts are used to govern transactions. In contrast to preexisting literature, we do not normalize the parties' reservation utilities to zero. We show that this assumption holds critical importance by demonstrating that a complete breakdown of negotiations may occur as the unique equilibrium outcome, even if only two sellers are present.

Implementation of laser speckle contrast analysis as connection kit for mobile phone for assessment of skin blood flow

2014

Laser speckle contrast analysis (LASCA) offers a non-contact, full-field, and real-time mapping of capillary blood flow and can be considered as an alternative method to Laser Doppler perfusion imaging. LASCA technique has been implemented in several commercial instruments. However, these systems are still too expensive and bulky to be widely available. Several optical techniques have found new implementations as connection kits for mobile phones thus offering low cost screening devices. In this work we demonstrate simple implementation of LASCA imaging technique as connection kit for mobile phone for primary low-cost assessment of skin blood flow. Stabilized 650 nm and 532 nm laser diode m…