Alexander’s wholeness as the scientific foundation of sustainable urban design and planning
Bin Jiang
Relying on the mathematical model and in particular the topological representation of wholeness, we have argued and demonstrated the mathematical and physical structure of wholeness, and how sustainable urban design can be viewed as the wholeness-extending processes. Wholeness is structural and objective, and pervasively exists in our surroundings, such as artifacts, ornaments, buildings, gardens, streets, and cities; and it can trigger positive feelings 'life and beauty' in our minds and hearts.... [more]

Assessment of GNSS-based systems for railways safety
Ernst Phillip Mrohs,Sravan Machiraju And Matthias Aichinger-Rosenberger
Under consideration of current approval processes in railway environment based on standards like EN 501026 RAMS-process (reliability, availability, maintainability, and safety) and available GNSS standards like EN 16803-1 and ETSI TS 103 246-3, the described approach presents a possible high-level process for assessment of GNSS based systems... [more]

Australian Height Datum: Celebrating 50 years
Volker Janssen And Simon McElroy
AHD remains Australia's first and only legal vertical datum and is still deemed fit for purpose for most applications. This paper celebrates the 50th anniversary of the Australian Height Datum (AHD), along with its achievements and longevity, outlines its shortcomings and looks ahead to a new era of vertical datum determination based on GNSS and airborne gravimetry... [more]