Yields, plant characteristics, total N and fibre composition of timothy cultivars grown at two latitudes

Selostus: Timoteilajikkeiden sadot, kasvuominaisuudet sekä typpi- ja kuitupitoisuus kahdella leveysasteella

Red clover grown in a mixture with grasses : yield, persistence and dynamics of quality characteristics

Selostus: Puna-apilan pysyvyys apila-heinänurmessa sekä seosnurmen satoisuus ja laadun muutokset erilaisissa kasvuoloissa

Influence of silvicultural regime on wood structure characteristics and mechanical properties of clear wood in Pinus sylvestris

Abstract

Historical logging, productivity, and structural characteristics of boreal coniferous forests in Norway

Abstract

Effect of thinning on stem form and wood characteristics of teak (Tectona grandis) in a humid tropical site in Costa Rica

Abstract

Landsat TM imagery and high altitude aerial photographs in estimation of forest characteristics

Abstract

Linear prediction application for modelling the relationships between a large number of stand characteristics of Norway spruce stands

Abstract

Performance Characteristics of an Axial-Flux Solid-Rotor-Core Induction Motor

The integration of electric motors and industrial appliances such as pumps, fans, and compressors is rapidly increasing. For instance, the integration of an electric motor and a centrifugal pump provides cost savings and improved performance characteristics. Material cost savings are achieved when an electric motor is integrated into the shaft of a centrifugal pump, and the motor utilizes the bearings of the pump. This arrangement leads to a smaller configuration that occupies less floor space. The performance characteristics of a pump drive can be improved by using the variable-speed technology. This enables the full speed control of the drive and the absence of a mechanical gearbox and couplers. When using rotational speeds higher than those that can be directly achieved by the network frequency the structure of the rotor has to be mechanically durable. In this thesis the performance characteristics of an axial-flux solid-rotor-core induction motor are determined. The motor studied is a one-rotor-one-stator axial-flux induction motor, and thus, there is only one air-gap between the rotor and the stator. The motor was designed for higher rotational speeds, and therefore a good mechanical strength of the solid-rotor-core rotor is required to withstand the mechanical stresses. The construction of the rotor and the high rotational speeds together produce a feature, which is not typical of traditional induction motors: the dominating loss component of the motor is the rotor eddy current loss. In the case of a typical industrial induction motor instead the dominating loss component is the stator copper loss. In this thesis, several methods to decrease the rotor eddy current losses in the case of axial-flux induction motors are presented. A prototype motor with 45 kW output power at 6000 min-1 was designed and constructed for ascertaining the results obtained from the numerical FEM calculations. In general, this thesis concentrates on the methods for improving the electromagnetic properties of an axial-flux solid-rotor-core induction motor and examines the methods for decreasing the harmonic eddy currents of the rotor. The target is to improve the efficiency of the motor and to reach the efficiency standard of the present-day industrial induction motors equipped with laminated rotors.

0 AND 02 ADSORPTION ON Ag/Cu[100]

In this work the adsorption mechanisms of atomic and molecular oxygen on Cu(100) surface are studied using ab initio simulation methods. Through the atomistic scale under-standing of the elementary oxidation processes we can further understand the large-scale oxidation. Copper is a material widely used in industry which makes it an interesting subject, and also understanding the oxidation of copper helps us understand the oxidation mechanism of other metals. First we have a look on some theory on surface alloys in general and behaviour of Ag on Cu(100) surface. After that the physical background there is behind the methods of density functional calculations are discussed, and some methods, namely potential energy surfaces and molecular dynamics, are introduced. Then there is a brief look on the numerical details used in the calculations, and after that, the results of the simulations are exhibited.

Characteristics of a good customer reference for a process equipment supplier

Työn tavoitteena oli tutkia hyvän asiakasreferenssin ominaisuuksia suodatinvalmistaja Laroxin myynnin ja huollon sekä yrityksen asiakkaiden näkökulmasta. Larox voi käyttää saatua tietoa referenssien tehokkaampaan valintaan ja hyödyntämiseen. Kaksi internet-kyselyä toteutettiin, välineenä Webropol. Alustava kysely sunnattiin Laroxin myynnille ja huollolle. Kysely koostui viidestä kategoriasta asiakasreferenssejä, joiden tärkeyttä arvioitiin, sekä vapaista vastauksista. Tunnistettuja hyvän asiakasreferenssin ominaisuuksia ovat hyvä suhde referenssiasiakkaaseen, positiiviset jarehelliset suosittelut asiakkaalta, referenssilaitteen hyvä toimintakyky ja asiakas joka ymmärtää huollon tärkeyden. Pääkysely suunnattiin Laroxin asiakkaille. Tilastollisilla analyyseilla tutkittiin koetun riskin mallinmuuttujien välisiä yhteyksiä. Analyysit eivät paljastaneet merkittäviä riippuvuuksia asiakasreferenssin ominaisuuksien tärkeydessä eritaustaisten vastaajien tai tilannetekijöiden välillä, mutta asiakasreferenssin ominaisuuksien faktorit tukevat mallia. Referenssilaitteiden toimintakyky vaikuttaa tärkeimmältä ja huollon tärkeys on myös merkittävä.