Search results for "Method"

Studies of ethylene/1-hexene copolymerization over zirconocene catalyst supported on MAO-modified MgCl2(THF)2. The effect of copolymerization conditi…

2003

Composition of catalytic system and copolymerization reaction conditions influence on heterogeneity of ethylene/1-hexene copolymers obtained over MgCI2(THF)2/MAO/Cp2ZrCl2/MAO catalyst was studied. One of the DSC techniques, i.e. successive self-nucleation/annealing (SSA) method allowing separation of the polymer into fractions with differing chemical composition in result of alternating crystallization and melting cycles was applied. It was found that the intermolecular heterogeneity exists inside all studied samples irrespective of the reaction conditions (temperature and time) and the catalyst composition (Al/Zr molar ratio). It was also confirmed that catalyst composition has a considera…

Modelling landslides in unsaturated slopes subjected to rainfall infiltration using material point method

2016

This paper presents a dynamic fully coupled formulation for saturated and unsaturated soils that undergo large deformations based on material point method. Governing equations are applied to porous material while considering it as a continuum in which the pores of the solid skeleton are filled with water and air. The accuracy of the developed method is tested with available experimental and numerical results. The developed method has been applied to investigate the failure and post-failure behaviour of rapid landslides in unsaturated slopes subjected to rainfall infiltration using two different bedrock geometries that lie below the top soil. The models show different failure and post-failur…

The English language teacher as a motivator

2008

Tämän proseminaari-työn tarkoitus oli tutkia, miten suuri vaikutus englanninopettajalla on oppilaidensa opiskelumotivaatioon sekä selvittää, mitkä motivointitekniikat oppilaat kokevat tehokkaimmiksi tavoiksi nostaa omaa opiskelumotivaatiotaan. Opiskelumotivaatio määrittelee sen, miksi opiskelemme sekä sen, miten määrätietoisesti ja innokkaasti haluamme oppia. Opiskelumotivaatiota on tutkittu laajalti eri näkökulmista, myös kieltenopetuksessa, ja sen lisäämiseen on laadittu monia opettamistekniikoita. Tämä tutkimus kuitenkin tarkasteli noita opettamistekniikoita oppilaiden näkökulmasta, täydentäen siten aiempaa tutkimusta. Viitekehyksenä tutkimuksessa käytettiin pääasiassa kolmea eri teosta,…

Will Second Life Help Me Survive in Italy?

2010

This paper aims at sharing the experience we had in the design and implementation of a short pilot course of Italian in Second Life® (SL). The paper will provide a description of the course mentioning preliminary findings, discussed in relation to the theories adopted by the two researchers. The paper is the result of the course, La Lingua in gioco: dire, fare e giocare in SL, that had a strong focus on the development of Intercultural Communicative Competence (ICC) and Oral Language Proficiency and was aimed at a group of third-level Irish students of Italian in the Dublin Institute of Technology (DIT), who will spend the third year of their degree in Italy (Erasmus programme). SL was used…

English rules ok : parental views on the choice of the first foreign language

2000

Lapsuuden löytämisestä toimijuuden tutkimukseen : lapsuuden historian kuusi vuosikymmentä

2022

Luvussa esitellään lapsuuden historiaa tutkimusalana ja tarjotaan välineitä ymmärtää tutkimusalan traditioita, erityispiirteitä ja lähestymistapoja. Luvussa pohditaan, millaisista lähtökohdista tutkimus on versonut 1960-luvulta lähtien, millaisia paradigmamuutoksia alalla on tapahtunut ja millaisia painopistealueita siitä voidaan havaita. Samalla pohdittavaksi asettuu tieteidenvälisen keskustelun merkitys menneisyyden lapsia koskevan tutkimuksen lähestymistapojen ja menetelmien muutokselle. Teksti perustuu aiemman lapsuuden historian tutkimuksen syntetisoivaan luentaan. Huomion kohteena ovat erityisesti tutkimusalaa eri aikoina määrittäneet ja tuloksia yhteen koonneet kokoomateokset, vaikut…

Modeling and improvement of the tricycle braking system for controlled skidding

2021

In the current paper was approached the braking system of tricycles for controlled skidding, which are used by lovers of extreme sports. The complete modeling of such a tricycle has been performed and its braking system has been improved for a great performance and a better controlled braking. Also, simulation tests were performed using the finite element to achieve the best constructive variant of the brake disc.

Testing the shape-similarity hypothesis between particle-size distribution and water retention for Sicilian soils

2012

Application of the Arya and Paris (AP) model to estimate the soil water retention curve requires a detailed description of the particlesize distribution (PSD) but limited experimental PSD data are generally determined by the conventional sieve-hydrometer (SH) method. Detailed PSDs can be obtained by fitting a continuous model to SH data or performing measurements by the laser diffraction (LD) method. The AP model was applied to 40 Sicilian soils for which the PSD was measured by both the SH and LD methods. The scale factor was set equal to 1.38 (procedure AP1) or estimated by a logistical model with parameters gathered from literature (procedure AP2). For both SH and LD data, procedure AP2 …

TESTING THE GRAIN-SIZE DISTRIBUTION DETERMINED BY LASER DIFFRACTOMETRY FOR SICILIAN SOILS

2012

In this paper the soil grain-size distribution determined by Laser Diffraction method (LDM) is tested using the Sieve-Hydrometer method (SHM) applied for 747 soil samples representing a different texture classification, sampled in Sicily. 005_Di_Stefano(599)_39 28-12-2011 15:01 Pagina 45 The analysis showed that the sand content measured by SHM can be assumed equal to the one determined by LDM. An underestimation of the clay fraction measured by LDM was obtained with respect to the SHM and a set of equations useful to refer laser diffraction measurements to SHM was calibrated using the measurements carried out for 635 soil samples. Finally, the proposed equations were tested using independe…

Immunoaffinity purification and characterization of mitochondrial membrane-bound D-3-hydroxybutyrate dehydrogenase from Jaculus orientalis.

2008

Abstract Background The interconversion of two important energy metabolites, 3-hydroxybutyrate and acetoacetate (the major ketone bodies), is catalyzed by D-3-hydroxybutyrate dehydrogenase (BDH1: EC 1.1.1.30), a NAD+-dependent enzyme. The eukaryotic enzyme is bound to the mitochondrial inner membrane and harbors a unique lecithin-dependent activity. Here, we report an advanced purification method of the mammalian BDH applied to the liver enzyme from jerboa (Jaculus orientalis), a hibernating rodent adapted to extreme diet and environmental conditions. Results Purifying BDH from jerboa liver overcomes its low specific activity in mitochondria for further biochemical characterization of the e…