Encountering waves overtaking a ship sailing on the ocean may cause instability. Therefore it is of great importance to study the properties of such waves, for example slope, wavelength and amplitude. When making statistics on the properties of overtaking waves, only the waves that are faster than the ship will affect the resulting distribution. Thus the velocity of the individual waves plays an i

Most processes (whether physical, chemical, or biological) produce or consume heat: measuring thermal power (the heat production rate) is therefore a typical method of studying processes. Here we describe the design of a simple isothermal heat conduction calorimeter built for use in teaching; we also provide an example of its use in simultaneously determining the rate constant and the reaction ent

In the end of the 1990ths came alarming reports that the vaccine against measles, mumps and rubella (MMR) could cause autism. The discovery about the connection was told in mass media all over the world and in Europe the vaccination frequency decreased with several percent. In some areas less than 90% of the children were vaccinated, a limit that calls “herd immunity”. In interviews with parents,

Högsta domstolen meddelade år 2011 en dom om brott enligt knivförbudslagen och en dom om förberedelse till allmänfarlig ödeläggelse. Båda domarna avser brott som inte har inneburit någon konkret skada mot person eller egendom. Vad kriminaliseringen tar sikte på är snarare risken för ett eventuellt brott som ligger i framtiden, vilket skulle innebär konkret skada. Högsta domstolens domar kommentera

"The Unified Growth Theory is receiving increasing attention from growth theorists since the seminal work of Galor and Weil (1999, 2000). These authors emphasize the need for a unified theory of growth that could account for the transition from Malthusian Stagnation to the Modern Growth Regime (1999). This interest is motivated by the lack of explanation and knowledge regarding the historical evol

Neuropathological changes in Parkinson's disease progress slowly and spread according to a characteristic pattern. Recent papers have shed light on this progression of pathology by examining the fate of neurons grafted into the brains of patients with Parkinson's disease. Two of these studies demonstrate that grafted healthy neurons can gradually develop the same pathology as host neurons in the d

In this paper various biogas systems based on waste materials have been analysed from an environmental point of view. The analyses are based on Swedish conditions using a systems analysis approach from an energy and life cycle perspective. The biogas produced is used as a transportation fuel replacing petrol in light-duty vehicles. The overall aims are to quantify the potential environmental effec