Lean Co-Acting With Circularity?: An Investigation in Product-Service Systems in Rental Housing

Circularity is positioned as an alternative model to achieve sustainable prosperity. Lean construction highlights not only building delivery with less but also contributing to sustainable development. However, lean is criticized for reducing waste only within organizational boundaries while neglecting the impact of waste beyond the boundaries....

Quantum Control of the Tin-Vacancy Spin Qubit in Diamond

Group-IV colour centres in diamond are a promising light-matter interface for quantum networking devices. We demonstrate multiaxis coherent control of the SnV spin-qubit via an all-optical stimulated Raman drive between the ground and excited states.

Low-thrust transfers from distant retrograde orbits to L2 halo orbits in the earth-moon system

Enable future missions Any mission to a DRO or halo orbit could benefit from the capability to transfer between these orbits Chemical propulsion could be used for these transfers, but at high propellant cost Fill gaps in knowledge A variety of transfers using SEP or solar sails have been studied for the Earth-Moon system Most results in...

Novel Solar Sail Mission Concepts for High-Latitude Earth and Lunar Observation

This paper proposes the use of solar sail periodic orbits in the Earth-Moon system for ob-servation of the high-latitudes of the Earth and Moon. At the Earth, the high-latitudes will be crucial in answering questions concerning global climate change, monitoring space weather events and ensuring sustainable development of these fragile regions....

Preliminary trajectory design for a solar polar observatory using SEP and multiple gravity assists

Satellite solar observatories have always been of central importance to heliophysics; while there have been numerous such missions, the solar poles have been extremely under-observed. This paper proposes to use low-thrust as well as multiple gravity assists to reach the enormous energies required obtain high heliocentric inclinations. Two novel...

Motion of quantum vortex lines near realistic rough boundaries

We numerically solve the three--dimensional, time--dependent Gross--Pitaevskii equation to model a superfluid flowing over a realistic rough boundary. Our model for the boundary is based on the atom--force microscope image of a NbTi vibrating wire used to generate turbulence in actual experiments. We find that near the boundary a dense region of...

Preliminary design of a multi-spacecraft mission to investigate solar system

This paper discusses a mission design concept that uses high-power solar electric propulsion (SEP) to re-direct one asteroid into the path of another, generating a low-velocity impact as a means of studying solar system evolution. In order to validate existing models and gain further insight in the processes involved, a multispacecraft approach...

Design and Applications of Solar Sail Periodic Orbits in the Non-Autonomous Earth-Moon System

Solar sailing has great potential for a range of high-energy and long duration mis-sions in the Sun-Earth system. This paper extends this potential to the non-autonomous Earth-Moon system through the use of a differential correction scheme, and by selecting suitable in-plane and out-of-plane sail steering laws to develop new families of solar...

The Development of an Integrated Ships Design Environment for the Naval Architect on the Linux Operating System

Tug propulsion investigation - The effect of a buttock flow stern on bollard pull, towing and free running performance