Yule River Borefield TEMPEST survey

A Scientific Tempest

A Web Application for Geothermal Borefield Design

The correct design of a borehole heat exchanger (BHE) system implies the accurate knowledge of borehole and ground thermal properties, the correct evaluation of building heating or cooling demands and the correct procedure to assess the final overall BHE length related to BHE configuration shape. A careful design is required to make profitable payback plans and provide expected long time perfor...

Tap water tempest

You know the news isn’t going to be good when the report of a new study cites sources in City Hall rather than the scientific literature. That’s exactly how the story broke in February, reporting a link between tap water and miscarriages in a California study. On February 10, the Los Angeles Times warned its readers in a front page report that “drinking five or more glasses of cold tap water pe...

A Delayed Yule Process

In now classic work, David Kendall (1966) recognized that the Yule process and Poisson process could be related by a (random) time change. Furthermore, he showed that the Yule population size rescaled by its mean has an almost sure exponentially distributed limit as t → ∞. In this note we introduce a class of coupled delayed continuous time Yule processes parameterized by 0 < α ≤ 1 and find a r...

Yule Process Sample Path Asymptotics

This paper presents two results on sample paths for the Yule process: one fluid limit theorem and one sample path large deviation result. The main interest is to understand the way large deviation occurs in the case of non-homogeneous processes. There are indeed two new phenomena. First there is no “typical” speed of large deviation. Second, the large deviation event is concentrated on a finite...