Necktie knots are inherently topological structures; what makes them tractable is the particular manner in which they are constructed. This observation motivates a map between tie knots and persistent walks on a triangular lattice. The topological structure embedded in a tie knot may be determined by appropriately manipulating its projection; we derive corresponding rules for tie knot sequences...

Direct measurement of exterior orientation parameters has been a challenge in photogrammetry for many years. Direct sensor orientation using a calibrated GPS/IMU system can potentially eliminate the need for ground control points and aerial triangulation, and consequently, result in a great reduction in the cost and time of aerial photogrammetry. Previous studies have shown that, comparing to c...

We analyse the response of the TIE-GCM computer model of the upper atmosphere to atmospheric tides at its lower boundary and to variations of night-time ionization rates. TIE-GCM is an expensive code, and we choose to use our thirty evaluations of the model to construct an emulator, and then use the emulator for the analysis. TIE-GCM has some non-standard features, namely a periodic input, and ...

Ankyloglossia (or tongue-tie) is a relatively uncommon congenital anomaly defined by an abnormally short lingual frenulum. Associations between tongue-tie and breastfeeding problems in infants have been inconsistent, and are a longstanding source of controversy in the medical community. Definitions of ankyloglossia vary, and management suggestions are not based on randomized controlled trials. ...

The crowding of wireless band has necessitated the development of multiband and wideband wireless antennas. Because of the self similar characteristics, fractal concepts have emerged as a design methodology for compact multiband antennas. A Koch-like fractal curve is proposed to transform ultra-wideband (UWB) bow-tie into so called Koch-like sided fractal bow-tie dipole. A small isosceles trian...

How do social networks motivate people to connect not only to their previously existing friends but also to novel or blind new contacts? We report the results of an experiment to identify the value that participants give to alternative network characteristics when deciding to connect to a social network. We focus on network tie characteristics because they represent information that potentially...

Bow-tie diagrams are emerging as a very useful tool to depict and maintain an up-to-date, real-time, working risk management system embedded in daily operations. They are a proven concept in the worldwide offshore industry. These diagrams provide a pictorial representation of the risk assessment process. This article introduces the bow-tie concept to the downstream and chemical process industri...