J.H. Lambert was one of the first scientists to use graphs to represent and analyse his (experimental) data. This article presents Lambert’s text “Vorstellung der Größen durch Figuren” that contains his most detailed discussion on the usability of graphs in (experimental) science. This text is put into the broader context of Lambert’s philosophical and mathematical work and illustrated by the a...

Article history: Received 24 November 2016 Received in revised form 17 February 2017 Accepted 19 February 2017 Available online 28 February 2017 Editor: N. Lambert

A new analytic approach to obtain the complete solution for systems of delay differential equations (DDE) based on the concept of Lambert functions is presented. The similarity with the concept of the state transition matrix in linear ordinary differential equations enables the approach to be used for general classes of linear delay differential equations using the matrix form of DDEs. The solu...

During the interception of a high-speed gliding vehicle (HGV), predicted intercept point (PIP) is updated many times, so interceptor must continuously adjust its trajectory. In this paper, we propose an online guidance correction algorithm for interceptor, which can effectively meet position constraints and energy management process. Firstly, simplify interceptor’s maneuvering problem to two-bo...

In 1992 and 1995, data were collected from 29 Navajo Native American adolescent mothers. In 2007 and 2008, data were collected from 21 of the original 29 (72%). Guided by feminist family theory, this investigation sought to (a) examine Navajo adolescent mothers' intimate partner relationships during the transition to parenthood, (b) identify themes in the young mothers' intimate partnerships ac...