This experimental study is intended to explore the heat performance of a novel vacuum tube heat collector with thermal storage. In order to enhance the heat transfer performance, we add radial metal fins to the U-tube which is used as the heat transfer channel of water. Meanwhile, in order to increase the thermal capacity of the heat collector, the heat collector model is designed to be larger ...

A science is a series of ‘conjectures and refutations’. The most powerful conjectures are those that are formulated in such a way that they may be easily refuted by observation. On this account, Universal Grammar is an extremely weak hypothesis. This is because (i) there are very few precise formulations of exactly what is in UG (Wunderlich’s list on pp.620–623 being an admirable exception), an...

German particle verbs have been a source of confusion and disagreement in both syntax and semantics. This is shown by the considerable variety of approaches to particle verb constructions (see Dehé et al. 2002 for an overview). The major challenges are the argument structure of particle verbs and the role that particles play in determining them, especially in those cases where the argument stru...