Search results for "Rotation"
showing 10 items of 935 documents
Molecule non-radiative coupling to a metallic nanosphere: an optical theorem treatment.
2009
The non-radiative coupling of a molecule to a metallic spherical particle is approximated by a sum involving particle quasistatic polarizabilities. We demonstrate that energy transfer from molecule to particle satisfies the optical theorem if size effects corrections are properly introduced into the quasistatic polarizabilities. We hope that this simplified model gives valuable information on the coupling mechanism between molecule and metallic nanos-tructures available for, e.g., surface enhanced spectroscopy signal analysis.
Statistical analysis when dealing with astigmatism: assessment of different spherocylindrical notations.
2001
Ophthalmic epidemiological studies frequently deal with ocular refractive errors, which are commonly expressed in the form sphere/cylinder x axis. However, this representation has been shown not to be the most suitable one for performing statistical analysis. Although alternative analytical and graphic methods to represent this kind of data have been developed, these formalisms have often gone unnoticed by researchers, despite their usefulness and versatility. Besides, there has been no discussion of how each of them fits in with a particular type of study. In this paper, several mathematical representations of dioptric power are revisited in a comprehensive way. The aim is to encourage res…
Residual astigmatism produced by toric intraocular lens rotation.
2010
Purpose To analyze changes in the eye’s refractive properties when a toric intraocular lens (IOL) rotates. Setting Fundacion Oftalmologica del Mediterraneo, Valencia, Spain. Design Experimental study. Methods The matrix definition of astigmatism was used in this theoretical study and compared with another vector representation. Two methods were compared: (1) The cylinder, C, resulting from the addition of 2 cylinders C1 and C2 whose axes form an angle a, is obtained by the addition of 2 vectors of values C1 and C2 forming an angle 2a; (2) the power matrix, F, of a thin astigmatic dioptric system that decomposes naturally into 3 orthogonal components: the purely spherical part Fnes, the orth…
Mixed Probabilistic-Guaranteed Optimal Design
2009
This chapter deals with the mixed probabilistic-guaranteed approach to optimal design of quasi-brittle membrane shells. Special attention is devoted to different problem formulations and analytical methods for their solution. Optimal thickness distributions are presented for various axisymmetric membrane shells. The presentation follows research results of [BRS03b].
A system-level mathematical model of Basal Ganglia motor-circuit for kinematic planning of arm movements
2017
International audience; In this paper, a novel system-level mathematical model of the Basal Ganglia (BG) for kinematic planning, is proposed. An arm composed of several segments presents a geometric redundancy. Thus, selecting one trajectory among an infinite number of possible ones requires overcoming redundancy, according to some kinds of optimization. Solving this optimization is assumed to be the function of BG in planning. In the proposed model, first, a mathematical solution of kinematic planning is proposed for movements of a redundant arm in a plane, based on minimizing energy consumption. Next, the function of each part in the model is interpreted as a possible role of a nucleus of…
Evolutionary algorithm for fiber laser in ultrashort pulse regime
2016
This thesis deals with the generation of ultrashort pulses within a fiber laser cavity through the automatic optimization of its parameters by an evolutionary algorithm. The interest of this subject comes from the difficulty to systematically explore dynamics in a large domain of experimental parameters. We have shown that it is possible to implement an evolutionary algorithm on fiber laser cavity with appropriate precautions. We have experimentally demonstrated for the first time the mode locking of a laser cavity only using the optimization of polarization controllers through an automatic and self-learning procedure. We also have demonstrated that selecting the mode locking from it radio-…
Third-sector job quality: evidence from Finland
2016
Purpose – The purpose of this paper is to study the perceived job quality and job satisfaction among third-sector employees and compare job quality in the third, public and private sector. Design/methodology/approach – The study is based on the quality of work life (QWL) survey data gathered by Statistics Finland. The QWL data are complemented with data set collected among third-sector employees. In the sector comparisons percentage shares were used to compare different dimensions of job quality between the sectors. Regression analysis was used to control the structural labour market differences between the sectors. Findings – The results show that job quality in the third sector differs s…
Job insecurity climate's influence on employees' job attitudes: Evidence from two European countries
2009
An important amount of literature about job insecurity and its consequences has been developed during the past few decades (Sverke, Hellgren, & Naswall, 2002). Most of this research has focused on an individual-analysis perspective, without taking into account social context. Although job insecurity climate has not been empirically examined, several authors have implicitly assumed that job insecurity contexts exist in some organizations where layoffs have occurred. Therefore, they examined layoff survivors' reactions. From this perspective, the aim of this study was to validate the job insecurity climate concept and examine its influence on employees' job attitudes. In order to provide addi…
Organizing for What: Job Rotation as an Organizational Development Strategy or as an Organizational anti-Corruption Tool?
2021
The purpose of this article is to understand if Job Rotation (JR)/Organizational Development (OD)-oriented strategies are compatible with JR strategies to curb Organizational Corruption (OC), as these strategies seem to indicate an apparent contradiction. To this end, the paper is structured as follows. Firstly, the main points of JR-Theory in organizational studies are displayed. Subsequently, JR-Theory in organizational anti-corruption is more deeply explored. At the end of the review, the research question is proposed in the methodological section. The two sections after that are devoted to answering this question. The first of which examines the laws and documents of the National Anti-C…
Target Classification by mmWave FMCW Radars Using Machine Learning on Range-Angle Images
2021
In this paper, we present a novel multiclass-target classification method for mmWave frequency modulated continuous wave (FMCW) radar operating in the frequency range of 77 - 81 GHz, based on custom range-angle heatmaps and machine learning tools. The elevation field of view (FoV) is increased by orienting the Radar antennas in elevation. In this orientation, the radar focuses the beam in elevation to improve the elevation FoV. The azimuth FoV is improved by mechanically rotating the Radar horizontally, which has antenna elements oriented in the elevation direction. The data from the Radar measurements obtained by mechanical rotation of the Radar in Azimuth are used to generate a range-angl…