Search results for " density"

The role of connectivity in the properties of sedimented materials

2003

Effective-medium theories for both random packings of elastic discs and mats of randomly sedimented elastic fibers can be constructed such that the effective material stiffness depends on the stiffness and geometry of the constituents of the material, and the number density of contacts. It is demonstrated that the number density of contacts together with the geometry of the constituents also determine the porosity of these materials. The simplicity and similar structure of the effective-medium estimates for the properties of these two qualitatively different materials indicate that the number density of contacts may play a similar role in an appropriate effective-medium description of a lar…

Unpredictability of fish recruitment: interannual variation in young-of-the-year abundance

2000

In 1989-1998, vendace larvae Coregonus albula were sampled in Finnish lakes following a stratified random sampling design. The abundance of young-of-the-year vendace after the first growing season was estimated using catch-per-unit-effort statistics. The number or total area of nursery places hardly limited the recruitment of vendace in the study lakes. The major proportion of prerecruit mortality of vendace occurred in the larval phase and larval sampling produced significant information on young-of-the-year survival. Although larval abundances and recruitment were clearly associated only in Lake Onkamo, generally high larval abundance was needed to produce high number of recruits.

Intra- and intergenotypic larval competition in Drosophila melanogaster : effect of larval density and biotic residues

1987

Atomic scale DFT simulations of point defects in uranium nitride

2007

Atomic scale density functional calculations are used to predict the behaviour of defects in uranium mononitride (UN). Two different density functional codes (VASP and CASTEP) were employed with supercells containing from 8 to 250 atoms (providing a significant range of defect concentrations). Schottky and nitrogen Frenkel point defect formation energies, local lattice relaxations and overall lattice parameter change, as well as the defect induced electronic density redistribution, are discussed.

Assisted software design of a wide variety of windings in rotating electrical machinery

2014

In this paper a software developed by the Authors for winding design is presented. In particular, this software can be used as a valid aid in design and analysis for a wide variety of windings with generic number of phases, pole pairs, slot number, etc.. The calculation of winding factors and the evaluation of their harmonic distribution is also accomplished. The software is implemented in MATLAB® environment. By means of some examples, covering the most relevant winding types, the capabilities of this software will be shown. Particularly, integer and fractional slot, single and double layer winding, concentrated windings, imbrication, belt widening and belt shifting techniques can be treat…

Analysing Lexical Density and Lexical Diversity in University Students’ Written Discourse

2015

Abstract This study analyses both lexical density and lexical diversity in the written production of two groups of first year students at the Universitat de Valencia at the beginning and end of one-semester teaching period. These results were compared with those obtained by a third group of students aiming at level C2. Lexical density was tested using Textalyser ( http://textalyser.net ) and lexical frequency used the software RANGE (Nation and Heatly, 1994). Our results prove that the students from both groups at level B1 show the same progression between writing tasks 1 and 3. Furthermore, we can claim that it is possible to obtain a reliable measure of lexical richness which is stable ac…

Proof of multilayer structural organization in self-assembled polycation-polyanion molecular films

1994

Abstract Multilayer organization of ultrathin polycation-polyanion self-assembled films is demonstrated using two approaches. (1) Fabrication of polyion superlattices with alternation of three different polyelectrolytes in (ABCB) n fashion, which gives rise to a Bragg peak in X-ray reflectivity. The spacing d=93.4 A corresponds to the repeat unit (ABCB) n . (2) Drying-induced manipulation of the film surface at regular intervals. Normally the layer-by-layer adsorption is carried out by keeping the film wet throughout all deposition cycles. Alternatively the film surface can be manipulated by gently drying the film in a stream of nitrogen or air after the adsorption of every layer. When the …

Clusterin and LRP2 are critical components of the hypothalamic feeding regulatory pathway.

2012

Hypothalamic feeding circuits are essential for the maintenance of energy balance. There have been intensive efforts to discover new biological molecules involved in these pathways. Here we report that central administration of clusterin, also called apolipoprotein J, causes anorexia, weight loss and activation of hypothalamic signal transduction-activated transcript-3 in mice. In contrast, inhibition of hypothalamic clusterin action results in increased food intake and body weight, leading to adiposity. These effects are likely mediated through the mutual actions of the low-density lipoprotein receptor-related protein-2, a potential receptor for clusterin, and the long-form leptin receptor…

Maximum Likelihood Estimation and non-linear least squares fitting with Levenberg-Marquardt Algorithm implementation in FPGA devices for high resolut…

2012

This work compares two possible solutions to achieve a higher resolution in a hodoscope based on Plastic Scintillating Fibers (PSF) by obtaining the point of maximum incidence of the radioactive beam. The two fitting algorithms proposed have been tested and implemented in Field Programmable Gate Array (FPGA) devices. On one hand, a probabilistic model based on the Maximum Likelihood Estimation (MLE) and on the other hand, non-linear least-squares fit with the Levenberg-Marquardt Algorithm (LMA).

Leksinių samplaikų sąrašo tikslinimas: bandymas taikyti Formulex metodą

2017

A number of corpus studies focusing on the description of the use and functions of lexical bundles havebeen conducted recently in order to explore the phraseology of learner language. As with any studiesof lexical bundles, the problem of overlapping or structurally incomplete items poses a particularchallenge. In practice, it is often difficult to align such units with specific discourse functions. The factthat lexical bundles do not constitute neat form-and-meaning mappings results from, among otherreasons, their being grounded in language use rather than language system. In this pilot study weattempt to test a new method called Formulex (Forsyth, 2015a; 2015b) to verify whether an applica…