Hitting the wall: Human sperm velocity recovery under ultra-confined conditions

Hitting The Relational Wall Andrew

(RDBMSs) have been very successful, but their success is limited to certain types of applications. As business users expand to newer types of applications, and grow older ones, their attempts to use RDBMS encounter the " Relational Wall, " where RDBMS technology no longer provides the performance and functionality needed. This wall is encountered when extending information models to support rel...

Raman Spectroscopy of Hydrogen Confined under Extreme Conditions

The challenge of confining hydrogen and its isotopes at high pressures and temperatures have hindered exploration of the predicted novel phases and their properties in static high P-T experiments. We have developed new methods to achieve good local confinement of hot, dense hydrogen that additionally protects the diamond anvils during the experiments. Raman spectra of such locally confined hydr...

Hitting the buffers: conspecific aggression undermines benefits of colonial breeding under adverse conditions.

Colonial breeding in birds is widely considered to benefit individuals through enhanced protection against predators or transfer of information about foraging sites. This view, however, is largely based on studies of seabirds carried out under favourable conditions. Recent breeding failures at many seabird colonies in the UK provide an opportunity to re-examine costs and benefits of coloniality...

Ultra sensitive measurement of dielectric current under pulsed stress conditions

Cognitive orientations in marathon running and "hitting the wall".

OBJECTIVES To investigate whether runners' cognitions during a marathon are related to "hitting the wall". To test a new and more comprehensive system for classifying cognition of marathon runners. METHODS Non-elite runners (n = 66) completed a questionnaire after finishing the 1996 London marathon. The runners were recruited through the charity SPARKS for whom they were raising money by runn...