Search results

Popular Abstract in Swedish I början 1990-talet upptäcktes att det var möjligt att syntetisera så kallad mesoporös silika. Upptäckten fick stor uppmärksamhet då materialen har ett flertal intressanta egenskaper som inkluderar ett stort antal porer med väldefinierad diameter, jämn partikelstorlek och möjligheten att påverka dessa och andra egenskaper. I den här avhandlingen har det mesoporösa siliSeveral aspects related to the mesoporous silica material SBA-15 have been studied through the use of a wide range of experimental techniques, including low voltage high-resolution scanning electron microscopy, small angle X-ray scattering and nitrogen sorption. This work contains three parts, which are in many ways overlapping. The first part deals with the formation of SBA-15, it is found that a

The major part of the Swedish hydro power development took place between 1945 and 1975. At that point of time, significant progress had been made regarding the use of high quality concrete for hydraulic structures. In spite of the progress made, deterioration of concrete due to freezing and thawing is still frequent. Superficial damage at the waterline and spalling of concrete far below the water

Popular Abstract in English “We are not free in this area.” This is what the iNduna, a traditional leader at KwaDapha, shared with me when we first met in August 2011. KwaDapha is a small rural community at Bhanga Nek, Kosi Bay, in northern KwaZulu-Natal/Maputaland – one of the most scenic areas on the South African coastline. Kosi Bay falls within the Coastal Forest Reserve section of the iSimaIn the past several decades under a growing influence of ecological modernisation, various assumed ‘win-win’ approaches to protected area conservation and poverty alleviation have been introduced all over the world, especially in resource-rich developing countries. Yet protected area conservation is an inherently political process, and the goals are often not achieved. There are concerns about com

Enterprise resource planning (ERP) systems are rapidly becoming a de facto standard in business activity. While large and medium-sized companies have the luxury to afford proprietary ERP solutions, small companies are struggling with resource poverty which maybe makes them consider available open source ERP products which are free from licensing fee. However, there is little knowledge available on

Context: Secondary hypogonadism is common in aging men; its natural history and predisposing factors are unclear. Objectives: The objectives were 1) to identify factors that predispose eugonadal men (T >= 10.5 nmol/L) to develop biochemical secondary hypogonadism (T < 10.5 nmol/L; LH <= 9.4 U/L) and secondary hypogonadal men to recover to eugonadism; and 2) to characterize clinical features associ

In this contribution we study the balloon angioplasty in a residually stressed artery by means of a non-local gradient-enhanced fibre damage model. The balloon angioplasty is a common surgical intervention used to extend or reopen narrowed blood vessels in order to restore the continuous blood flow in, for instance, atherosclerotic arteries. Inelastic, i.e. predominantly damage-related and elastop

Background: End-stage kidney disease overwhelms health services in Central America. We determined prevalences of decreased kidney function in distinct populations in the most affected region of Nicaragua. Study Design: Cross-sectional survey. Setting & Participants: Total populations aged 20-60 years of 5 villages in Northwest Nicaragua: mining/subsistence farming (elevation, 100-300 m above s

Popular Abstract in Swedish Talet om det mångkulturella i skolan och samhället: En analys av diskurser om det mångkulturella inom utbildning och politik åren 1973-2006 Det svenska samhället har under de senaste tre decennierna påverkats av debatter, rapporteringar och diskussioner om det mångkulturella samhället. Frågan om hur man ska handskas med ?det mångkulturella? har uppfattats och beskrivitThe debate on "multicultural issues" has had a considerable impact on society, and in Sweden, dealing with such issues has been described and defined as a major problem. The aim of the present thesis is to analyse the various contents of discourses on multicultural issues that have influenced education and policy documents during the period 1973-2006. On several occasions, the Swedish government h

We present a study of high-order-harmonic generation (HHG) assisted by extreme ultraviolet (XUV) attosecond pulses, which can lead to the excitation of inner-shell electrons and the generation of a second HHG plateau. With the treatment of a one-dimensional model of krypton, based on time-dependent configuration interaction singles (TDCIS) of an effective two-electron system, we show that the XUV-

Today there are climate policy targets within the EU and Sweden about limiting global warming and drastically reducing greenhouse gas emissions. In order to stay within the goal of a global warming of less than 2 ºC, the industrialised countries should decrease their emissions by 80-95 % in 2050, and bring them down to zero in the longer run. Scenario studies indicate that this is possible to achi

The paper presents a feedback scheduling strategy for multiple control tasks that uses feedback from the plant states to distribute the computing resources optimally among the tasks. Linear-quadratic controllers are analyzed, and expressions relating the expected cost to the sampling period and the plant state are derived and used for on-line sample-rate adjustments. In the case of minimum-varianc

We implemented a functional neuronal network that was able to learn and discriminate haptic features from biomimetic tactile sensor inputs using a two-layer spiking neuron model and homeostatic synaptic learning mechanism. The first order neuron model was used to emulate biological tactile afferents and the second order neuron model was used to emulate biological cuneate neurons. We have evaluated

In this letter, the fading statistics of wireless channels in high-speed railway cutting scenarios are characterized based on measurements. A multiple scattering model called second-order scattering fading (SOSF) is used to model the small-scale fading considering the influence of cuttings and bridges. The SOSF model can offer the possibility of analytical estimation for different fading severitie

In order to improve the surface quality of TC4 titanium alloy parts, the effect of grinding parameters on surface integrity must be known. In this research, an experimental analysis has been conducted to understand the effect of grinding parameters, including cutting velocity, feed rate, grinding depth and abrasive size, on material removal and surface integrity. Before conducting experiment, test

Through significant developments and progresses in the last two decades, in vivo localized nuclear magnetic resonance spectroscopy (MRS) became a method of choice to probe brain metabolic pathways in a non-invasive way. Beside the measurement of the total concentration of more than 20 metabolites, (1)H MRS can be used to quantify the dynamics of substrate transport across the blood-brain barrier b