A multi-regional computation scheme in an AR-assisted in situ CNC simulation environment

2010 ◽  
Vol 42 (12) ◽  
pp. 1167-1177 ◽  
Author(s):  
J. Zhang ◽  
S.K. Ong ◽  
A.Y.C. Nee
Keyword(s):  
Simulation Environment ◽  
Computation Scheme ◽  
Cnc Simulation

scholarly journals Our Contribution to the NASA RASSOR Bucket Drum Design Challenge

2021 ◽  
Vol 166 (2) ◽  
pp. 104-111
Author(s):  
Stephan Weißenböck ◽  
Eric Fimbinger
Keyword(s):  
The Moon ◽  
Simulation Environment ◽  
Construction Operations ◽  
The Public ◽  
Final Design ◽  
Design Challenge ◽  
The University ◽  
Improved Technology ◽  
Local Materials

AbstractNASA’s Artemis program aims to return humans to the Moon sustainably and efficiently by using new and improved technology, which is based on the concept of generating products with local materials, a practice called In Situ Resource Utilization (ISRU). Regolith excavation is the fundamental step in the ISRU chain to produce local commodities, such as propellants and breathing air, and to pursue construction operations. NASA is currently working on the Regolith Advanced Surface Systems Operations Robot (RASSOR), the key technology to enable extraterrestrial mining. The robot uses counterrotating bucket drums that capture regolith and keep it from falling out. NASA reached out to the public via GrabCAD to improve the robot’s design and chose five concepts, which will be tested and further improved. A team of three students from the University of Leoben (Dominik Höber, Andreas Taschner, and Stephan Weißenböck) took part in the challenge set by NASA and shared their ideas and concepts. They used this opportunity to implement their acquired knowledge from their studies and were also supported by a researcher from the Chair of Mining Engineering of the University of Leoben—Eric Fimbinger. The final design consists of three significant elements that were fused to increase efficiency: An outer helix, a spiral tunnel, and an inner helix. These three important components make up the concept which impressed the jury and reached fourth place out of approx. 350 entries. Due to the success of the project as well as the aroused interest amongst the students, further research projects were initialised as follow-ups, dealing with the topic of extraterrestrial mining. One is a research and development study covered by two master’s theses about excavation and conveying concepts on the Moon (see the article by Höber, Taschner and Fimbinger in this issue). The other one is in the form of a bachelor’s thesis to compare and analyse chosen concepts from the design challenge in a numerical simulation environment with equal conditions to allow virtual testing of those chosen designs.

Rendez vous with Saturn's rings

1984 ◽  
Vol 75 ◽  
pp. 743-759 ◽  
Author(s):  
Kerry T. Nock
Keyword(s):  
Solar Energy ◽  
Electric Propulsion ◽  
Power Source ◽  
Propulsion System ◽  
Low Thrust ◽  
Ring Plane ◽  
The Earth ◽  
Total Impulse ◽  
Saturn's Rings

ABSTRACTA mission to rendezvous with the rings of Saturn is studied with regard to science rationale and instrumentation and engineering feasibility and design. Future detailedin situexploration of the rings of Saturn will require spacecraft systems with enormous propulsive capability. NASA is currently studying the critical technologies for just such a system, called Nuclear Electric Propulsion (NEP). Electric propulsion is the only technology which can effectively provide the required total impulse for this demanding mission. Furthermore, the power source must be nuclear because the solar energy reaching Saturn is only 1% of that at the Earth. An important aspect of this mission is the ability of the low thrust propulsion system to continuously boost the spacecraft above the ring plane as it spirals in toward Saturn, thus enabling scientific measurements of ring particles from only a few kilometers.

The Use of Advanced Analytical Techniques for Characterization of the Chemical, Physical, and Crystallographic Nature of a Surface

1973 ◽  
Vol 31 ◽  
pp. 132-133 ◽  
Author(s):  
R. E. Herfert
Keyword(s):  
Surface Characterization ◽  
Analytical Techniques ◽  
X Ray Diffraction ◽  
Depth Of Penetration ◽  
X Ray ◽  
The Past ◽  
Transmission Electron ◽  
Scanning Electron

Studies of the nature of a surface, either metallic or nonmetallic, in the past, have been limited to the instrumentation available for these measurements. In the past, optical microscopy, replica transmission electron microscopy, electron or X-ray diffraction and optical or X-ray spectroscopy have provided the means of surface characterization. Actually, some of these techniques are not purely surface; the depth of penetration may be a few thousands of an inch. Within the last five years, instrumentation has been made available which now makes it practical for use to study the outer few 100A of layers and characterize it completely from a chemical, physical, and crystallographic standpoint. The scanning electron microscope (SEM) provides a means of viewing the surface of a material in situ to magnifications as high as 250,000X.

Structural Studies on Mitotic Spindle Fibres

1978 ◽  
Vol 36 (3) ◽  
pp. 615-626
Author(s):  
J.R. Mcintosh
Keyword(s):  
Chemical Composition ◽  
Mitotic Spindle ◽  
Structural Studies ◽  
Mitotic Apparatus ◽  
Chemical Studies ◽  
Medical Interest ◽  
Spindle Fibres

The mitotic apparatus is a structure of obvious biological and medical interest, but it has proved to be a difficult cellular machine to understand. The chemical composition of the spindle is only slightly elucidated, largely because of the difficulties in preparing useful isolates of the structure. Chemical studies of the mitotic spindle have been reviewed elsewhere (Mcintosh, 1977), and will not be discussed further here. One would think that structural studies on the mitotic apparatus (MA) in situ would be straightforward, but even with this approach there is some disagreement in the results obtained with various methods and by different investigators. In this paper I will review briefly the approaches which have been used in structural studies of the MA, pointing out the strengths and problems of each approach. I will summarize the principal findings of the different methods, and identify what seem to be fruitful avenues for further work.

Electron Probe Analysis of Muscle

1982 ◽  
Vol 40 ◽  
pp. 398-401
Author(s):  
A. V. Somlyo ◽  
H. Shuman ◽  
A. P. Somlyo
Keyword(s):  
Skeletal Muscle ◽  
Smooth Muscle ◽  
Sarcoplasmic Reticulum ◽  
Resting State ◽  
Binding Sites ◽  
Electron Probe ◽  
Frog Skeletal Muscle ◽  
Electron Probe Analysis ◽  
Probe Analysis

Electron probe analysis of frozen dried cryosections of frog skeletal muscle, rabbit vascular smooth muscle and of isolated, hyperpermeab1 e rabbit cardiac myocytes has been used to determine the composition of the cytoplasm and organelles in the resting state as well as during contraction. The concentration of elements within the organelles reflects the permeabilities of the organelle membranes to the cytoplasmic ions as well as binding sites. The measurements of [Ca] in the sarcoplasmic reticulum (SR) and mitochondria at rest and during contraction, have direct bearing on their role as release and/or storage sites for Ca in situ.

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