We use residual-delay maps of observational field data for barometric pressure to demonstrate the structure of latitudinal gradients in nonlinearity in the atmosphere. Nonlinearity is weak and largely lacking in tropical and subtropical sites and increases rapidly into the temperate regions where the time series also appear to be much noisier. The degree of nonlinearity closely follows the meri...

Recent advancements in wearable inertial sensor technology have enabled extensive research into activity classification. However, the distinction between the sitting and standing activities using trunk-worn wearable monitoring systems remains challenging, thus requiring additional sources of information such as elevation change. The aim of this study is to demonstrate the suitability of baromet...

A challenging task in using pedestrian navigation and guidance services indoors is to determine the correct floor of a user in a multi-storey building because most indoor location techniques only provide 2-D information. In this case it can be recommended to augment the position determination system with a barometric pressure sensor for direct observation of height differences. In the research ...

We present a technique for detecting floor changes in an indoor environment and improving pedestrian indoor localization and navigation. Our technique relies on barometric pressure sensors commonly available on smartphones and tablets. We developed an algorithm running on smart mobile devices that can be integrated in any indoor localization system to improve accuracy and support 3D navigation....

negative and therefore the fluctuation of the readings reduced to normal pressure is only statistical. There is no indication of a systematic variation due to causes other than variation of pressure. Since the statistical fluctuation is large it cannot be excluded that systematic variations with amplitudes much smaller than the barometric fluctuation occur but are masked by the statistical fluc...

Underground nuclear weapon testing produces radionuclide gases which may seep to the surface. Barometric pumping of gas through explosion-fractured rock is investigated using a new sequentially-coupled hydrodynamic rock damage/gas transport model. Fracture networks are produced for two rock types (granite and tuff) and three depths of burial. The fracture networks are integrated into a flow and...