Search results for "perfect"
showing 10 items of 321 documents
The English present perfect in Finnish 7th grade EFL textbooks
2014
Kielioppi ja sen opettaminen ovat aina olleet keskeinen osa kielen tutkimusta ja opetusta, minkä johdosta teorioita siitä miten kielioppia tulisi opettaa on runsaasti. Sen sijaan tutkimusta erityisesti englannin oppikirjojen sisältämästä kieliopista on tehty vain vähän, vaikka oppikirjat ovat usein iso osa opetusta. Tutkielmassani tarkastelun kohteena on neljä yläasteen ensimmäiselle luokka-asteelle suunnattua oppikirjaparia ja se miten niissä opetetaan englannin perfekti. Tarkoituksenani oli tutkia ensinnäkin millaisia tehtäviä kirjoissa on perfektin opettamiseen ja toisekseen millaista kieliopin opettamisen suuntaa kirjat sisällön perusteella edustavat. Tutkimus on lähtökohdiltaan laadull…
The value of perfect and imperfect information in lake monitoring and management.
2020
Highlights • Knowledge on the value of monitoring can assist decision-making in lake management. • We calculate value of perfect information theoretically. • We estimate value of imperfect information with Monte Carlo type of approach. • Generally, monitoring is profitable to invest in if VOI exceeds the cost. • Additional monitoring is profitable even if the lake is in good condition a priori. Uncertainty in the information obtained through monitoring complicates decision making about aquatic ecosystems management actions. We suggest the value of information (VOI) to assess the profitability of paying for additional monitoring information, when taking into account the costs and benefits of…
A shallow water SPH model with PML boundaries
2015
Abstract We focus on the study and implementation of Smoothed Particle Hydrodynamics (SPH) numerical code to deal with non-reflecting boundary conditions, starting from the Perfect Matched Layer (PML) approach. Basically, the method exploits the concept of a physical damping which acts on a fictitious layer added to the edges of computational domain. In this paper, we develop the study of time dependent shallow waves propagating on a finite 2D-XY plane domain and their behavior in the presence of circular and, more generic, rectangular boundary absorbing layers. In particular, an analysis of variation of the layer׳s thickness versus the absorbing efficiency is conducted. In our model, the m…
Compensation of compliance errors in parallel manipulators composed of non-perfect kinematic chains
2012
The paper is devoted to the compliance errors compensation for parallel manipulators under external loading. Proposed approach is based on the non-linear stiffness modeling and reduces to a proper adjusting of a target trajectory. In contrast to previous works, in addition to compliance errors caused by machining forces, the problem of assembling errors caused by inaccuracy in the kinematic chains is considered. The advantages and practical significance of the proposed approach are illustrated by examples that deal with groove milling with Orthoglide manipulator.
Compliance error compensation technique for parallel robots composed of non-perfect serial chains
2012
The paper presents the compliance errors compensation technique for over-constrained parallel manipulators under external and internal loadings. This technique is based on the non-linear stiffness modeling which is able to take into account the influence of non-perfect geometry of serial chains caused by manufacturing errors. Within the developed technique, the deviation compensation reduces to an adjustment of a target trajectory that is modified in the off-line mode. The advantages and practical significance of the proposed technique are illustrated by an example that deals with groove milling by the Orthoglide manipulator that considers different locations of the workpiece. It is also de…
REDUCTION OF CONSTRAINT SYSTEMS
1993
Geometric modeling by constraints leads to large systems of algebraic equations. This paper studies bipartite graphs underlaid by systems of equations. It shows how these graphs make possible to polynomially decompose these systems into well constrained, over-, and underconstrained subsystems. This paper also gives an efficient method to decompose well constrained systems into irreducible ones. These decompositions greatly speed up the resolution in case of reducible systems. They also allow debugging systems of constraints.
Gradient estimates for the perfect conductivity problem in anisotropic media
2018
Abstract We study the perfect conductivity problem when two perfectly conducting inclusions are closely located to each other in an anisotropic background medium. We establish optimal upper and lower gradient bounds for the solution in any dimension which characterize the singular behavior of the electric field as the distance between the inclusions goes to zero.
Dynamic Behaviour of an Axially Moving Plate Undergoing Small Cylindrical Deformation Submerged in Axially Flowing Ideal Fluid
2011
Abstract The out-of-plane dynamic response of a moving plate, travelling between two rollers at a constant velocity, is studied, taking into account the mutual interaction between the vibrating plate and the surrounding, axially flowing ideal fluid. Transverse displacement of the plate (assumed cylindrical) is described by an integro-differential equation that includes a local inertia term, Coriolis and centrifugal forces, the aerodynamic reaction of the external medium, the vertical projection of membrane tension, the bending resistance, and external perturbation forces. In the two-dimensional model thus set up, the aerodynamic reaction is found analytically as a functional of the cylindri…
Incentive System Design Based on Accrual Accounting: A Summary and Analysis
2009
ABSTRACT: This paper provides a formal analysis on how to design accrual-based incentive systems so that a manager's and owner's interests are properly aligned. We introduce a general framework to summarize the literature, provide various extensions to it, and point to some of its limitations. We characterize the entire class of goal-congruent and preference-similar incentive systems when the owner has perfect as well as imperfect information about the manager's preferences. This allows us to show how compensation functions and performance measures are interrelated and to demonstrate what information should be incorporated into compensation functions and performance measures. We illustrate …
Parasitic microfungi on land plants in France : a commented list of presumably unpublished taxa.
2019
As part of an inventory of more than 800 parasitic Microfungi on land plants from the centre of France, 47 taxa reveal having no satisfactory correspondence with already described species in the usual textbooks devoted to this subject. As such, these seemingly yet unpublished taxa may constitute material of interest, for which critically commented descriptions are provided.