Search results for "Marte"
showing 10 items of 48 documents
Update of the distribution and habitat use of the wildcat, pine marten and weasel in Sicily
2020
The wildcat (Felis silvestris), the pine marten (Martes martes) and the weasel (Mustela nivalis) are key members of the mammalian community in Sicily, actually performing the role of top predators and consequently influencing the trophic chain both in natural and agricultural areas. However, despite their protected status, very little information is available regarding their occurrence and ecology. Here, by verifying published studies, collecting personal observations and analyzing novel field data obtained by camera traps, we update their spatial distribution in Sicily, contributing to a better understanding of their habitat use and suggesting future research to improve our knowledge of th…
Emigrazione e immigrazione in Italia. Un quadro delle politiche migratorie dall'età liberale alla Bossi-Fini
2018
Il saggio presenta un breve quadro delle politiche migratorie in Italia dall'età liberale all'Italia repubblicana
Experimental and Numerical Analysis of Microstructure Evolution during Linear Friction Welding of Ti6Al4V
2015
Abstract Linear Friction Welding (LFW) is a solid state welding process used to joint bulk components. In the paper, an experimental and numerical study on LFW of Ti6Al4V titanium alloy is presented. A laboratory designed LFW machine has been used to weld the specimens with different contact pressure and oscillation frequency. The joint microstructure has been experimentally observed with SEM and EDS. A dedicated numerical model, able to predict temperature, strain and strain rate distribution as well as the phase volume fraction evolution, has been utilized to predict the final microstructure in the welded parts. It was found that complete transformation of the alpha phase into beta phase …
Changes of Structure and Physical-Mechanical Properties in Alloy Steels Thermochemically Treated by Plasma Nitriding
2021
Plasma nitriding is a method of surface modification using a glow discharge technology to introduce nitrogen into the surface of a metal, which subsequently diffuses into the material. The main advantages of plasma nitriding over conventional nitriding processes are: reduced cycle time, controlled growth of the surface layer, elimination of white layer, reduced distortion, no need of finishing, pore-free surfaces and mechanical masks instead of copper plating. The process is especially suitable for complex parts that are intensively solicited by wear, fatigue, contact pressure, shocks, possibly also to corrosion. It is applied in order to bring the metallic products in a state favourable fr…
An MDE Approach for Rapid Prototyping and Implementation of Dynamic Reconfigurable Systems
2015
This article presents a co-design methodology based on RecoMARTE, an extension to the well-known UML MARTE profile, which is used for the specification and automatic generation of Dynamic and Partially Reconfigurable Systems-on-Chip (DRSoC). This endeavor is part of a larger framework in which Model-Driven Engineering (MDE) techniques are extensively used for modeling and via model transformations, generating executable models, which are exploited by implementation tools to create reconfigurable systems. More specifically, the methodological aspects presented in this article are concerned with expediting the conception and implementation of the hardware platform and the integration of corre…
Martensite transition and microscopic magnetism of epitaxial Ni2MnGa films
2007
AbstractA magnetically induced shape memory effect in Ni2MnGa results in huge magnetostrictive effects of several percent. Using x-ray absorption spectroscopy (XAS) and magnetic circular dichroism (XMCD) we investigated element specific magnetic moments and electronic structure of single crystalline, (110) oriented Ni2MnGa films on a-plane Al2O3 substrates in the austenite and martensite state. The structural phase transition of the samples is evident from temperature dependent x-ray diffraction and magnetization measurements. The Ni XAS differ significantly for temperatures above and below the martensite transition in agreement with published ab-initio calculations. Using XAS in transmissi…
Sukupolvenvaihdos behavioristisesta näkökulmasta : case: Martela oyj
2001
Caunu (Martes spp.) barošanās paradumu un citu faktoru ietekme uz helmintofaunu un to raksturojošajiem parametriem Latvijā un Lietuvā
2016
Caunas ir savvaļas rezervuāri zoonotiskām un veterināri nozīmīgām parazītu sugām, barošanās paradumu izpēte sniedz informāciju par iespējamiem parazītu invadēšanās ceļiem. Materiāli pētījumam ievākti Latvijas un Lietuvas reģionos laikaposmā no oktobra līdz aprīlim. Lai veiktu barības analīzi, izmeklēti 144 caunu kuņģi. Konstatētie barības objekti iedalīti 14 lielās kategorijās, zīdītāju taksoni noteikti pēc akotmatu struktūras. Kursa darba ietvaros 150 caunas helmintofaunas noteikšanai izmeklētas ar Skrjabina pilnās helmintoloģiskās sekcijas metodi. Meža caunas galvenie barības objekti pēc patērētās biomasas ir grauzēji (37,6%), putni (29,3%) un augi (17,7%) un attiecīgi sastāda arī lielāko…
Vienšūnas parazīta Toxoplasma gondii ekstensitāte meža caunas (Martes martes) un akmeņu caunas (Martes foina) populācijās Latvijas un Lietuvas terito…
2015
Vienšūnas parazītam Toxoplasma gondii par starpsaimnieku var kļūt jebkuras siltasiņu dzīvnieku sugas pārstāvis - arī meža un akmeņu caunas. Laikā no 2011.gada līdz 2014.gadam Latvijas un Lietuvas teritorijā tika ievākti 186 meža un akmeņu caunu muskulatūras paraugi, lai noteiktu T. gondii izplatību, sastopamību un to ietekmējošos faktorus. Kopējā konstatētā T. gondii invāzijas ekstensitāte caunās ir 65,1%. Būtiski augstāka T. gondii ekstensitāte konstatēta meža caunās (67,8%), salīdzinot ar akmeņu caunās konstatēto (52,9%). Būtiskākais T. gondii ekstensitāti ietekmējošais faktors ir dzīvnieka svars. Meža caunām būtiski augstāka T. gondii invāzijas ekstensitāte (69,8%) tika novērota skujkoku…
Defects in Martensitic Stainless Steel 1.4031 (EN) Exposed to Friction as Seen by Positron Annihilation
2010
We present experimental results of measurements of the Doppler broadening of annihilation line and positron annihilation lifetimes in martensitic stainless steel 1.4031 (EN) samples exposed to the dry sliding under different loads. In particular, we tested the subsurface zone under the worn surfaces. As a main result, we obtained information about the defect profiles in this zone and the total extent of the damage region induced by the dry sliding.