Sökresultat

The superconductivity under doping in the famous cuprate compounds is believed to originate in the CuO2 planes. The mediator of pairing is generally accepted to be induced from electronic degrees of freedom. While many mechanisms, such as spin fluctuations, have been proposed throughout the years, little research has been carried out on the role of the retarded attraction due to electronic overscr

Trötta ögon, huvudvärk, för kallt eller för varmt och allmänt lägre prestationsförmåga. Så kan det se ut på ett kontor med dålig ventilation och detta minskar förtjänsten för företaget samtidigt som det för de anställda upplevs påfrestande. Med ett väl dimensionerat, och rätt valt tilluftssystem blir inomhusklimatet avsevärt bättre och de anställda har de bästa förutsättningarna att med glädje preThis study compares the two traditional ventilation methods ; mixed ventilation and displacement ventilation, with a new type of dif fuser which attempts to solve the problem with blockage of the diffuser for the displacement ventilation. This new diffuser called Airshower is a product developed by Airson engineering AB whom is also the company where all simulations and tests for this study were

Customer relation is an important factor in service minded sectors, and providing a flawless support to compliment that service can be an important factor while having customers. This puts support personnel in a crucial role to handle problems that the customer requests, but also see to it that the problems never happen. Telavox, a telecommunications company, supplies various communication service

The stochastic volatility (SV) model is an alternative to GARCH models to model time varying volatility. In this thesis the basic stochastic volatility model and three different estimation methods are described---namely, Bayesian Markov chain Monte Carlo (MCMC) methods, quasi maximum-likelihood (QML) and generalized method of moments (GMM). To compare these estimation methods a large scale simul

This thesis seeks to examine the effect of food shortages on marital fertility in Malawi for the period of 1987-2009. Malawi provides an interesting case for studying this relationship, since the country has experienced many instances of food shortages in the studied period. The study was done by using the 2004 and 2010 Demographic and Health Survey for Malawi to utilise the retrospective data ava

Sammanfattningsvis består arbetets problemställning av: • Presterar kv Betan enligt den energiprestanda som huset är projekterat för och är kv Betan ett bra projekt att använda som referens? • Hur fungerar erfarenhetsåterföring inom Företaget idag och hur kan hantering av information förbättras? Vilka verktyg behövs för att förenkla Företagets sätt att arbeta med projekt som kräver mätning och ko

The purpose of this thesis was to determine how a heavy duty vehicle manufacturer can create an economical viable business model for used batteries from electric buses and trucks. Heavy duty vehicles are responsible for 30% of on-road CO2 emissions in the European Union, but could be decreased if this sector would be electrified. One major barrier for this transition is the large cost for the batt

Mountains provide a variety of ecosystem services, such as drinking water, which sustains not only mountain communities but also people living further downstream. While climate change threatens most ecosystems, its negative impacts are up to three times greater in high altitudes. As well as changing the water cycle this further accelerates climate change. Although they contribute comparably little

Due to accidental external explosions ,which is not handle in the Eurocodes, are structural designers looking for other ways to design loads for external loads due to explosions. This combined with lighter building structures is a reason to address the issues of analysing the dynamic behavior of buildings subjected to air blasts from these extreme situations. The structural designers analyze the

Framtidens energilagring banar väg åt förnyelsebar elenergi Andelen förnyelsebar elenergi på marknaden ökar ständigt. En negativ aspekt med dessa källor är att vi inte kan kontrollera när energin skall vara tillgänglig – vindkraften behöver vind och solkraften behöver strålande sol. För att överkomma dessa motsättningar och göra energin mer tillförlitlig behöver vind och solenergi kompletteras meIn this study, different membranes were tested for their use in a vanadium redox flow battery (VRB). The membranes were first tested under charge-discharge operation of the VRB over four charge-discharge cycles at different current densities (20 mAcm-2, 40 mA cm-2 and 60 mAcm-2) and the corresponding cell performance was evaluated in terms of total energy efficiency (EE), coulombic efficiency (CE)

Agricultural systems, specifically in the global South, and the people living of them, are more than others, exposed to changes in the environment around them. Smallholder farmers (that work in agroecological systems), with a low standard of living, are the most vulnerable to short-term shocks and long-term stresses. There have been attempts by development agencies, researchers and local governmen

Insulating glass unit (IGU) is separated double or triple glass panes with closed cavities in between, usually filled with argon to reduce the heat transfer. When a construction like this is exposed to temperature variations the volume of the gas will change and pressure changes will occur. The glass panes will bulge which will give displacements and stresses in the glass panes. For large dimensio

In nuclear piping engineering, the response spectrum method of analysis is widely used to analyze piping systems. The matter of combining modal responses is of great interest. Complications may occur with the response spectrum method for large systems. Examples are convergence issues and something called twin-mode effects that may overestimate the effects on the system. This master thesis investi

The actual concept of food security focuses on four food security dimensions: food availability, food access, food utilization and food stability of which eight indicators were identified for this study. The study aims to evaluate vulnerability to chronic food and nutrition insecurity, one of the food stability types, in Ethiopia; and examines the relationship between four food security dimensions

"Transportation" is believed to be one of the main essential elements for the development of human civilization. From road to rail and from sea to sky. Till now, we human have formed many varied modes of transport that we facilitate in our daily lives. It is inevitable that a place that gathered the more people, the greater consumption of transportation. Many demanding cities like Londo

Hur ser vår inre NuRD ut? NuRD är ett molekylkomplex som arbetar med att slå på och av gener i vårt DNA. Man har upptäckt att NuRD ibland stänger av gener som normalt verkar för att hämma cancer. Om man kunde ta reda på den exakta strukturen av NuRD så skulle man kunna designa läkemedel som hindrar NuRD från att stänga av våra naturliga cancerhämmare. Vår arvsmassa är samlad som en kod i en värThe Nucleosome Remodeling and Deacetylase (NuRD) complex is a transcriptional regulator essential to several normal developmental processes, but also found to have a role in several types of cancer. In order to design cancer therapies targeting this complex, determining the structure and subunit composition is crucial. X-ray crystallography is required for the level of detail desired, demanding la

In current experiments at the high-power laser facility at the Lund Laser Centre, electrons accelerated to hundreds of MeV over short distances by means of laser wakefield acceleration in produced plasmas. To determine the amount of secondary radiation generated when accelerated electrons interact with surrounding materials is of interest to ensure a safe working environment. In this thesis, the

Bimodal harmonic structured (HS) materials, is a new class of multi-scale architected metallic materials having specified topological arrangement of coarse- and ultra-fine grains. HS are experimentally proven to combine both high strength and ductility associated with ultra-fine- and coarse-grained fractions respectively. In this work, finite-element models of HS structured specimens were construc

Protected areas (PAs) embody a historical legacy of value contestation and human exclusion. While the rise of community-based conservation in the 1980s sought to reconfigure this mechanism by running a counter narrative arguing that biodiversity conservation and development were mutually reinforcing objectives, exclusionary PAs continue to maintain a strong position in the conservation discourse.