Filetype
In recent years, there has been growing interest in stabilized index reduction techniques for differential-algebraic equations (DAE) of multibody dynamics. A number of the proposals which incorporate the idea of a projection onto the constraint manifold are discussed. The methods are divided into classes based on whether the projection is performed on the residuals of the discretized DAE or on the
Fuel cells are promising for future energy systems, since they are energy efficient and, when hydrogen is used as fuel, there are no emissions of greenhouse gases. Fuel cells have during recent years various improvements, however the technology is still in the early phases of development, this can be noted by the lack of dominant design both for singe fuel cells, stacks and for entire fuel cell sy
Popular Abstract in English At our workplace, at home, and on the road, we rely on software. It has become one of the central technologies on which we base our society. Yet, software is perhaps the major technology that is understood the least by the general population. Most software today is written in languages that requires the programmer to specify not only what is to be achieved, but also hoWriting efficient parallel programs is the biggest challenge of the software industry for the foreseeable future. We are currently in a time when parallel computers are the norm, not the exception. Soon, parallel processors will be standard even in cell phones. Without drastic changes in hardware development, all software must be parallelized to its fullest extent. Parallelism can increase perfor
A research-based understanding of permafrost distribution at a sufficient spatial resolution is important to meet the demands of science, education and society. We present a new permafrost map for Norway, Sweden and Finland that provides a more detailed and updated description of permafrost distribution in this area than previously available. We implemented the CryoGRID1 model at 1km2 resolution,
Requirements Engineering has recently been greatly influenced by the way how firms use Open Source Software (OSS) and Software Ecosystems (SECOs) as a part of their product development and business models. This is further emphasized by the paradigm of Open Innovation, which highlights how firms should strive to use both internal and external resources to advance their internal innovation and techn
One-neutron removal cross-sections (σ-1n) of 17,19C in various targets at about 900 MeV/nucleon, and one-proton removal cross-sections (σ-1p) of 8,10B at about 1400 MeV/nucleon were measured using the fragment separator FRS at GSI. A significant increase of σ-1n for 19C compared to its neighbors was observed. The same behavior was found for σ-1p for the neutron-deficient nucleus 8B compared to the
We present parameterized algorithms for the k-path problem, the p-packing of q-sets problem, and the q-dimensional p-matching problem. Our algorithms solve these problems with high probability in time exponential only in the parameter (k, p, q) and using polynomial space. The constant bases of the exponentials are significantly smaller than in previous works; for example, for the k-path problem th
III-V compound semiconductors are used in, among many other things, high-frequency electronics. They are also considered as a replacement for silicon in CMOS technology. Yet, a III-V transistor outperforming state-of-the-art silicon devices in VLSI-relevant metrics has not yet decisively been demonstrated. In this work, the limits of III-V FET performance, for both RF and VLSI applications, are ex
As more people move to cities and urban areas are growing, demand for urban transport increases. This leads not only to pressure on sustainability and climate goals, but also on the attractiveness and liveability of urban areas. Thus, it is necessary to decrease the use of private cars and create a modal shift towards more sustainable modes of transport, such as walking, cycling and public transpo
Ischemic stroke is a leading cause of death and disability worldwide. Currently, there is no treatment that can promote recovery in the chronic phase. It has been shown that neurogenesis occurs in ischemic striatum in rodents and probably also in humans. Moreover, blood-borne macrophages have been found to enhance spontaneous post- stroke recovery in mice. These findings have suggested potentia
Stochastic processes are indispensable tools for development and research in signal and image processing, automatic control, oceanography, structural reliability, environmetrics, climatology, econometrics, and many other areas of science and engineering. Suitable for a one-semester course, Stationary Stochastic Processes for Scientists and Engineers teaches students how to use these processes effi
The influence of supranational regimes has dramatically increased in the last decades. How this influence is manifested and which consequences it has had and continues to have on education is discussed in this paper. More specifically, the paper highlights lifelong learning and the Bologna process seen as projects, the explicit aims of which starkly contrast to their effects on such vital issues a
