Sökresultat

Popular Abstract in English Among the large variety of experiments performed in science, a common one is to pass a light beam through a sample, the object to be studied, and to study the outcomes of the light-sample interaction. Many light sources have been used for this purpose, like light bulbs and lasers. A modern light source used nowadays is the so-called storage ring. In the storage rings elSynchrotron radiation sources have greatly contributed to the progress in many fields of science. The development of the storage ring technologies has made possible to obtain very low emittance electron beams, which together with the use of undulators allow guiding a very high photon flux into a very small spot required by the experiments. Development of the sources has been accompanied with equa

Hydrogen is most easily used as combustion engine fuel in a spark ignition engine. This chapter starts from the properties of hydrogen and hydrogen mixtures to present the various options for running spark ignition engines on hydrogen, reviewing the power density potential, emissions and efficiency. This is then linked to past and present research and development of hydrogen fueled vehicles, befor

An integrated system for the production of hydrogen by gasification of biomass and electrolysis of water has been designed and cost estimated. The electrolyser provides part of the hydrogen product as well as the oxygen required for the oxygen blown gasifier. The production cost was estimated to 39 SEK/kg H-2 at an annual production rate of 15 000 ton, assuming 10% interest rate and an economic li

PNAS202122586_proof.pdf Astronomers uncover newway tomeasure the speed of stars Ken Croswell, Science Writer As an ambulance speeds toward you, its sirens scream at a high pitch. That pitch suddenly drops when the vehicle rushes by and races away. The change in pitch arises from a well-known phenome- non called the Doppler shift. However, the effect is more than just an amusing oddity. For more th

https://www.astro.lu.se/sites/astro.lu.se/files/2022-01/New%20way%20to%20measure%20speed%20of%20stars%20-%20PNAS%202022.pdf - 2026-06-08

A 128kb ultra-low voltage SRAM, based on a leakage optimized single-WELL 7T bitcell in 28 nm FD–SOI technology is presented. An ideal power management scenario in a single supply system is achieved by permanently keeping the storage elements in the vicinity of the retention voltage. Performance and reliability is regained by boosting the voltage on critical nodes. The cost of voltage boost generat

Hydrogen stands out as a compelling alternative to fossil fuels for combustion engines. Predictive combustion models are instrumental in developing hydrogen-fuelled engines. A fundamental metric of these models is the laminar burning velocity (LBV), which can be precisely determined through laminar flame propagation simulations. In this context, the selection of an appropriate combustion mechanism

The Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany, provides unique possibilities for a new generation of hadron-, nuclear- and atomic physics experiments. The future antiProton ANnihilations at DArmstadt (PANDA or P ¯ ANDA) experiment at FAIR will offer a broad physics programme, covering different aspects of the strong interaction. Understanding the latter in the non-pertu

The paper is concerned with heat integration of a conceptual hydrogen plant connected with a sugar factory. The sugar factory serves as a source of sucrose-containing thick juice for the hydrogen plant, where this feedstock is processed to hydrogen. Moreover, this connection gives an opportunity to utilize waste heat from the sugar factory. Hydrogen is produced by two-stage fermentation, that is,

Synergistic effects of nanosecond plasma discharge and hydrogen on the combustion characteristics of ammonia/air are numerically studied under conditions relevant to gas turbine combustion chambers. It is shown that increasing the plasma contribution in assisting the flame results in lower NOX emissions by up to 27% than those in flames assisted by hydrogen for the range of operating conditions co

THz absorption spectra have been recorded for the weakly bound molecular complexes of H2O with C2H4 and C2H2 embedded in cryogenic neon matrices at 2.8 K. The observation and assignment of a large-amplitude acceptor OH librational mode of the C2H2 - H2O complex at 145.5 cm−1 confirms an intermolecular CH⋯O hydrogen-bonded configuration of C2v symmetry with the H2O subunit acting as the hydrogen bo

The effects of climate change have led to increasing concern regarding global emissions, especially carbon dioxide (CO2) emissions. A significantcontributor to these emissions is the combustion of fossil fuels in internal combustion engines (ICEs). This combustion process is also responsible forother harmful emissions such as carbon monoxide (CO), soot, and nitrogen oxides (NOx). Although signific

Popular Abstract in English There is a natural tendency to take advantage of the most convenient energy source available. In this usage, convenient may mean most abundant, easiest to harvest or simplest to handle. Convenient will also correspond to cheapest in many instances. However, some consider it a responsibility to think of the long term costs of the energy we use. No form of energy is free The matured laser-diagnostic techniques of planar laser-induced fluorescence (PLIF) and particle image velocimetry (PIV) were applied to a prototype gas turbine burner operating on various fuels. The work was performed to provide verification of computational fluid dynamic (CFD) models of the combustion of atypical fuels in a gas turbine combustor. The burner was operated using methane and three s

The Impact of a Proposed Australian Emissions Trading Scheme Emissions Trading Scheme Effects on the Australian Electricity System - A Qualitative Study of Environment Society and Economy Alham Yusuf Lund University International Masters Program in Environmental Studies and Sustainability Sciences LUMES 2006/08 MESM01 Thesis Course Supervisor Joakim Nordqvist Environmental and Energy System Studie

https://www.lumes.lu.se/sites/lumes.lu.se/files/alham_yusuf.pdf - 2026-06-08

https://www.nano.lu.se/sites/nano.lu.se/files/nanoscience_colloquium2012_yi_cui.pdf - 2026-06-08

The work in the group is in the general field of organotransition metal chemistry and the goal is to find and develop organometallic reactions with possible applications in catalysis. We use specialised synthetic techniques, including high-vacuum, Schlenk and glove box work. Structural characterisation is performed using mainly multi-nuclear NMR spectroscopy and X-ray crystallography. In our work

https://www.cas.lu.se/research/inorganic-chemistry/wendt-group - 2026-06-07

As the Internet of Things (IoT) era emerges the need for ultra-low power (ULP) devices is becoming more eminent. A research-proven approach to achieve ULP consumption is to aggressively lower the supply voltage (VDD) below or in the vicinity of the transistor threshold voltage (Vth) and operate the transistors in the subthreshold (sub-Vth) region. Operating below or near the threshold voltage, i.eAs the Internet of Things (IoT) era emerges the need for ultra-low power (ULP) devices is becoming more eminent. A research-proven approach to achieve ULP consumption is to aggressively lower the supply voltage (VDD) below or in the vicinity of the transistor threshold voltage (Vth) and operate the transistors in the subthreshold (sub-Vth) region. Operating below or near the threshold voltage, i.e