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The dynamic instability and related problems when turning high chromium cast iron (HCCI) with two polycrystalline cubic boron nitride (PCBN) tools in wide range of cutting speeds and feed rates were studied in the article. The tool wear mechanisms and specifics for both tools as a main criterion of appearance of process instability were investigated. In spite of the chatter-like surface of machine
The first part of this paper aims at identifying the timing of famines in the Nordic countries since the middle ages. This is done by using qualitative famine reports from the literature since quantitative data on famines are scarce or non-existent, at least before the early modern period. We supplement the reports with climate data and price data. Our survey indicates that widespread famine was a
Ternary isothermal (25°C) polyoxyalkylene triblock block copolymer ((EO)x(PO)y(EO)x where x is the number of ethylene oxide, EO, segments and y is the number of propylene oxide, PO, segments) systems with water and p-xylene as selective solvents for the PEO and PPO blocks, respectively, were chosen as study systems in this thesis as these ternary systems are good model systems for the self-assembl
Popular Abstract in Swedish Under det senaste årtiondet har förekomsten av läkemedel i miljön rönt stor uppmärksamhet. Studier har visat att flera läkemedel hittats i sjöar och vattendrag och kan förorsaka negativa effekter hos vattenlevande organismer. Den i särklass största vägen via vilken läkemedel når miljön är avloppsreningsverk. Efter att vi ätit ett läkemedel kommer kroppen också att utsönThis thesis addresses the application of hollow fiber liquid phase microextraction as a simple, efficient and environmentally friendly tool to study the fate of four common anti-inflammatory drugs (ketoprofen, naproxen, diclofenac and ibuprofen) during wastewater treatment. Initial experiments verified that this technique is applicable on aqueous as well as suspensions of solid samples, thus great
Stability in presence of (possibly varying)time-delays in a control loopconsisting of a continuous-time plant and a discrete-time controlleris studied.A simple stability criterion is developed—agraphical test in a Bode plot of the closed loop system. The graphicaltest makes it very easy to design the controller for time-delayrobustness.
This thesis is concerned with two aspects of peripheral nerve injury. First the early changes in the gene expression of the dorsal root ganglion (DRG) in response to sciatic nerve injury as revealed by micro-array analysis. Second an examination of the effect of PAI-1 and amphiregulin on survival and axonal outgrowth from DRG. Based on the micro-array analysis, performed on DRG 12 h and 24 h post
In this paper we present and discuss some of the lessons learnt from the completed CoLabs.eu project within the so called R3L-initiative on European Networks of Learning Regions. In the project we made some concrete social experiments in order to “make the village a virtual campus”. We start this paper by making a general introduction to the research area and by giving the motivating background to
Popular Abstract in Swedish Kvantprickar är objekt där elektroner är instängda i en mycket liten volym (av storleksordningen 100 nanometer i varje riktning). I den här avhandlingen har vi studerat kvantprickar definierade i nanotrådar av halvledarmaterial. Nanotrådarna kan vara flera mikrometer långa men samtidigt mycket tunna (mindre än 100 nanometer eller 0,1 mikrometer). Vi har skapat kvantpriThis thesis focuses on electrical transport in semiconductor InAs nanowires grown by chemical beam epitaxy. Initially, transport length scales of homogeneous InAs n-type nanowires are characterized by low-temperature magnetoconductance measurements. The measurements show phase-coherent conductivity corrections. By fitting the data, we find the nanowire mean-free path to be 50 nm and the phase-cohe
Using two epochs of observations with HST/WFPC2 we obtain the stellar proper motions for all stars in the field. The proper motion are used to separate the bulge from the cluster stars. The stellar sequences in the resulting colour-magnitude diagram (CMD) are better defined than in any previously published CMD. Using a-enhanced stellar isochrones we find NGC 6528 to have a probable age of 11 +/- 2
