3 research outputs found
Dual-head Electromagnetic Variable Sweeping Speed Space Broom for Space Debris Mitigation
No full textThe conceptual design of a dual-head electromagnetic variable speed propulsion system for sweeping the space debris using a space broom with inverted pendulum mechanism is described. The design demonstrates its capability for producing continuously the reciprocating moment of a magnetic piston using a Polarity Changer Timing Circuit (PCTC). The space broom is connected to the magnetic piston through a pivot point, with bearing and angular potentiometer, using cart and pole swing-up mechanism. The sweeping speed of the space broom can be altered, according to the mission requirements, by altering the reciprocating speed of the magnetic piston by varying the pole strengths of the magnetic heads and the timing of the PCTC. We observed that the dual-head electromagnetic variable speed propulsion system can offer various other applications for devising the sub-systems for space exploration probes, planet impact spinning probe, space stations and satellites. The uniqueness of this system comes from the fact that at the propelling conditions the system can be effectively integrated with a connecting rod and a crank shaft for getting rotary motion for various systems and subsystems applications while sweeping the broom continuously for space debris mitigation. We concluded that the design optimization of a dual-head electromagnetic variable sweeping speed space broom is a meaningful objective for space debris mitigation lucratively
Technical and administrative feasibility of alluvial aquifer storage and recovery on the South Platte River of northeastern Colorado
No full textAbstract
Increasing population and climate change are causing water managers to reassess water storage. In this context, alluvial aquifer storage and recovery (ASR), in which excess water is stored in the alluvium near a river, offers a plausible option. To investigate this option, a coupled technical–administrative analysis was conducted to investigate the feasibility of alluvial ASR in the semi-arid US state of Colorado, where water rights are governed by the doctrine of prior appropriation. A hypothetical alluvial ASR facility near Brighton, Colorado with a storage capacity of 118,500 cubic meters (96 ac-ft) was considered. This analysis comprises both technical feasibility, using a groundwater model that explicitly accounts for clogging, and administrative feasibility, using a first-of-its-kind analysis of the legal availability of water including both free river and reusable effluent water. This coupled technical–administrative analysis suggests that alluvial ASR facilities present a viable option to meet rising demand for water storage, preventing water loss due to evaporation, reducing the effect of climate stress on water resources, and avoiding the need to purchase land for above-ground water storage facilities. More generally, this study illustrates the crucial importance of placing hydrologic analysis in the broader context of policy constraints.</jats:p
