Introduktion: Dental erosion definieras som förlust av tandens hårdvävnad genom en kemisk process som inte involverar bakterier. Dagens förändrade livsstil och kosthållning medför att våra tänder oftare utsätts för kemisk påverkan som kan leda till erosion. Det är flera faktorer som samverkar och dental erosion har en multifaktoriell etiologi.Syfte: Syftet är att beskriva olika registreringsmetoder för dental erosion.Frågeställningar: Vilka metoder kan användas för registrering av initial erosion? Vilka metoder kan användas för registrering av avancerad erosionsskada? Vilka metoder är kliniskt beprövade på patient?Metod: LitteraturstudieResultat: Ett flertal registreringsmetoder fanns beskrivna i litteraturen, merparten var inte applicerbara kliniskt. Registeringsmetoderna som framgick i den beskrivande litteraturstudien var: 3D scanning microscope (IFM), Atomic absorption spectroscopy (AAS), Digital photography (DP), Focus-variation 3D microscopy (FVM), Longitudinal microradiography (LMR), Non-contact confocal laser scanning microscopy (CLSM), Optical assessment, Optical profilometry (OP), Quantitative light-induced fluorescence (QLF), Scanning electron microscopy (SEM), Stylus profilometry (SP), Ultrasound, White light interferometry (WLI) och X-ray diffraction (XRD).Konklusion: Vid registrering av initial erosion krävs analys av tandytans mineralinnehåll samt optiska analyser med hjälp av instrument.

Ear disease and hearing loss in preschool children can be difficult to discover and diagnose. This paper investigates ear disease in 20 children controls from 1 to 5 years of age. The aim of the study was to map prevalence and incidence for ear disease, and prevalence of hearing loss in a group of children.Twenty children wide aged 1, 1½, 3 and 5 were included and investigated according to a set protocol with psychoacoustic tests, tympanometry, ear microscopy and a parental questionnaire. The majority of the children could be evaluated by age adequate psychoacoustic tests and otoscopy. Tympanometry was the investigation method that was most difficult to perform.

Syftet med studien är att undersöka hur elever berättar om läsning och   läsundervisning samt hur de berättar om sin delaktighet i arbetet med sin   läsning. Studien utgår från elevens perspektiv och från ett   specialpedagogiskt perspektiv.Studien har en kvalitativ ansats och utgår från den sociokulturella   synen på kunskap, att vi lär i gemensamma verksamheter genom att kommunicera   med andra. Datainsamlingen genomfördes med semistrukturerade intervjuer. Sammanlagt   åtta elever i år 2 till och med år 5 intervjuades.Resultaten visar på ansvarsfulla elever som berättar om nödvändigheten   i att kunna läsa och insikt om att läsförmåga och att leva i vårt samhälle   har ett samband. De är i det stora hela positiva till läsning och berättar om   flera positiva upplevelser som de får genom sin läsning men läsvanor och   elevernas erfarenhet av undervisning skiljer sig åt.

: Syftet med denna uppsats är att beskriva och undersöka kundlojaliteten inom Länsförsäkringar Bergslagen samt ge förslag på taktiska åtgärder som företaget kan använda sig av vid utformandet av sin marknadskommunikation för att vidare utveckla och bibehålla lojaliteten hos sina lantbrukskunder..

Corporate Social Responsibility (CSR) refers to adjusting corporate goals so that they are not only based on maximizing corporate profits, but include ethical standards on socially desirable behavior (Boatright, 2008). Even though many companies have integrated CSR into their business operations, there are still many issues that are difficult to tackle. Especially Multinational Corporations (MNCs) in the global business environment face many challenging situations due to the fact that they often have linkages to countries where the local government is either unwilling or unable to take care of its responsibilities. MNCs often find themselves with increased responsibilities when they start solving some of the issues that earlier have been the sole responsibility of states. A specific case situation discussed in this paper is related to ?conflict minerals?.

Transformation of inorganic mercury (Hg) to methyl mercury (MeHg) is a biotic process that is proposed to be conducted primarily by sulphate reducing bacteria (SRB). The formation of MeHg is of great interest because it is the mercury species that biomagnifies to the greatest extent in the aquatic food webs; about 90 % of all Hg in fish is MeHg. Our understanding of factors involved in the production of MeHg is very important for making a reliable risk assessment. The purposes of this study were to investigate the different factors that control the solubility of Hg and the production of MeHg in a contaminated lake sediment. The lake Ala-Lombolo, Kiruna municipality, is well-known to be contaminated by mercury from different sources. Sediment cores were sampled at three different locations (N, SW and SE) in the lake and divided in three different layers; 0-5, 5-10 and 10-15 cm.

De flesta politiska riktlinjer har idag en hållbar samhällsutveckling som övergripande och gemensam nationell ambition. Det innebär att uppsatta mål för ekologisk, ekonomisk och social hållbarhet ska nås i samverkan mellan aktörer från olika sektorer och på olika beslutsnivåer. Att förstå vad det innebär på lokal och regional nivå, och hur man kan nå de målen, är inte så enkelt. Syftet med denna studie är att skapa ett underlag som kan användas i arbetet med hållbar landsbygdsutveckling, inom den informella regionen Bergslagen i Sverige. Hinder och möjligheter för hållbar landsbygdsutveckling har analyserats genom att arrangera fokusgruppdiskussioner med olika intressegrupper i samhället.

By understanding which factors that affect individuals´ will to share knowledge with others within an organization, companies can successfully develop a knowledge-based culture by influencing individuals´ attitudes and behaviour concerning knowledge sharing. Several researchers claim that intrinsic motivational factors can consistently facilitate knowledge sharing between individuals within an organization. Other researchers also assert that extrinsic motivational factors, such as reward systems, might affect individuals? motivation to share knowledge. However, extrinsic motivational factors´ impact on knowledge sharing is a relatively unexplored field and more empirical studies are sought after.

Future emission legislation puts great emphasis on increasing the efficiency of the engine, thereby reducing fuel consumption. The tribological contact between cylinder liner and piston ring is where an great amount of energy is lost due to friction, and by reducing these losses an reduction in fuel consumption can be achieved.The aim of this thesis was to evaluate the tested piston ring coatings against a plasma sprayed cylinder liner and rank these combinations of materials for friction and wear resistance. The coatings that were tested was Cr + Al2O3, (Al,Cr)N, two types of CrN and WC / C.The experimental tests were performed with a so-called pin-plate, where used oil with addition of an acidic mixture of sulfuric and nitric acid to mimic the acidic condensate formed when exhausts recirculate, were added with a continuous flow. The results were then analyzed by weighing, studies by optical microscopy and scanning electron microscopy (SEM) and profile measurements.The results from each material combination were that the plasma coated cylinder liner wears too aggressively in order to yield a ranking of the piston ring coatings based on the parameters of friction and wear resistance. It is therefore proposed that an alternative coating on the cylinder liner should be developed, lacking the large abrasive wear on piston rings and that can withstand the corrosive environment resulting in engines equipped with EGR.

Water hardness indicates the concentration of calcium and magnesium ions in water. Water with high concentrations of these ions is described as hard water and water with low concentrations is described as soft water. Water that is too hard or too soft can lead to technical and economical problems. In collaboration with Midvatten AB, groundwater hardness in the Badelunda esker between Leksand and Avesta has been mapped, and an attempt has been made to explain the variations. For this purpose, different GIS programs, such as ArcView, ArcInfo, IDIRISI, and one geochemical modelling program, PHREEQC, has been used.

: Syftet med denna uppsats är att beskriva och undersöka kundlojaliteten inom Länsförsäkringar Bergslagen samt ge förslag på taktiska åtgärder som företaget kan använda sig av vid utformandet av sin marknadskommunikation för att vidare utveckla och bibehålla lojaliteten hos sina lantbrukskunder..

Future emission legislation puts great emphasis on increasing the efficiency of the engine, thereby reducing fuel consumption. The tribological contact between cylinder liner and piston ring is where an great amount of energy is lost due to friction, and by reducing these losses an reduction in fuel consumption can be achieved.The aim of this thesis was to evaluate the tested piston ring coatings against a plasma sprayed cylinder liner and rank these combinations of materials for friction and wear resistance. The coatings that were tested was Cr + Al2O3, (Al,Cr)N, two types of CrN and WC / C.The experimental tests were performed with a so-called pin-plate, where used oil with addition of an acidic mixture of sulfuric and nitric acid to mimic the acidic condensate formed when exhausts recirculate, were added with a continuous flow. The results were then analyzed by weighing, studies by optical microscopy and scanning electron microscopy (SEM) and profile measurements.The results from each material combination were that the plasma coated cylinder liner wears too aggressively in order to yield a ranking of the piston ring coatings based on the parameters of friction and wear resistance. It is therefore proposed that an alternative coating on the cylinder liner should be developed, lacking the large abrasive wear on piston rings and that can withstand the corrosive environment resulting in engines equipped with EGR.

The mining industry, in terms of ore excavation and metal production, is and has been important to the Swedish economy. In connection with the ore excavation process, large amounts of partly sulphidic waste are produced. When the metal sulphides are exposed to air and water they are eventually oxidised, which leads to the formation of acidic water with high concentrations of metal cations and sulphate ions, so called Acid Mine Drainage (AMD). This water may reach the nearest surroundings and cause negative environmental effects. By covering the waste with soil or water, the oxidation process can be minimised. At the Rävlidmyran mine in the county of Västerbotten open pit mining took place between 1951 and 1991.

In an attempt to develop a more cost-efficient material for solar   energy applications, nano-particles of nickel oxide composite in a silikatmatris manufactured with solar gelmethod and studied structurally by electron microscopy. Furthermore, the thin film optical properties characterized by Variable. Angel Spectroscopic Ellipsometry. Sol gelfilms suitability as a selective absorber surface is also analyzed by optical modeling..

I föreliggande arbete presenteras hur olika egenskaper som påverkar hänsynsarealer och drivningsförhållanden vid föryngringsavverkning förväntas variera över tiden och för olika delar av Sveaskogs skogsinnehav. Egenskaper som studerats är gränssträcka mot andra ägoslag, bärighet, ytstruktur, lutning, fuktighet, avstånd till väg, avdelningsstorlek, avdelningsform (areal/omkrets), antal polygoner per avdelning samt inslag av småimpediment Gränssträckan mot andra ägoslag studerades mot myrimpediment, bergimpediment, vatten, vattendrag, betesmark och åkermark. Beräkningar gjordes på fyra olika områden. I grova drag kan områdena sägas motsvara Norrbottens län, Västerbottens län, Bergslagen samt Götaland. I de två nordligaste områdena studerades hur förhållande beräknas vara idag samt om lO, 30 och 50 år, och i de två sydligaste områdena studerades hur förhållandena beräknas vara idag samt om lO, 20 och 40 år.