Deep Impact Groundsupport Observations of Comet 9P/Tempel 1: a Student Contribution

2008 ◽  
pp. 25-28
Author(s):  
C. Sterken ◽  
Y. Bouzid ◽  
T. Tuvikene ◽  
N. Shafi ◽  
P. Okouma ◽  
...  
Keyword(s):  
Deep Impact ◽  
Student Contribution

Deep Impact

2006 ◽  
Vol 17 (6) ◽  
pp. 33-35 ◽  
Keyword(s):  
Deep Impact

scholarly journals Challenges of Ablatively Cooled Hybrid Rockets for Satellites or Upper Stages

Aerospace ◽  
2021 ◽  
Vol 8 (7) ◽  
pp. 190
Author(s):  
Francesco Barato
Keyword(s):  
Combustion Chamber ◽  
Solid Fuel ◽  
Diameter Ratio ◽  
Propulsion System ◽  
Burning Time ◽  
Regression Rate ◽  
Hybrid Propulsion ◽  
Deep Impact ◽  
Time Ratio ◽  
Hybrid Rockets

Ablative-cooled hybrid rockets could potentially combine a similar versatility of a liquid propulsion system with a much simplified architecture. These characteristics make this kind of propulsion attractive, among others, for applications such as satellites and upper stages. In this paper, the use of hybrid rockets for those situations is reviewed. It is shown that, for a competitive implementation, several challenges need to be addressed, which are not the general ones often discussed in the hybrid literature. In particular, the optimal thrust to burning time ratio, which is often relatively low in liquid engines, has a deep impact on the grain geometry, that, in turn, must comply some constrains. The regression rate sometime needs to be tailored in order to avoid unreasonable grain shapes, with the consequence that the dimensional trends start to follow some sort of counter-intuitive behavior. The length to diameter ratio of the hybrid combustion chamber imposes some packaging issues in order to compact the whole propulsion system. Finally, the heat soak-back during long off phases between multiple burns could compromise the integrity of the case and of the solid fuel. Therefore, if the advantages of hybrid propulsion are to be exploited, the aspects mentioned in this paper shall be carefully considered and properly faced.

Low Power Pulse-Triggered Flip-Flop Based on Clock Triggering Edge Control Technique

2015 ◽  
Vol 24 (07) ◽  
pp. 1550094 ◽  
Author(s):  
Jizhong Shen ◽  
Liang Geng ◽  
Xuexiang Wu
Keyword(s):  
Integrated Circuits ◽  
Power Dissipation ◽  
Energy Efficient ◽  
Clock Cycle ◽  
Control Technique ◽  
Switching Activity ◽  
Digital Integrated Circuits ◽  
Flip Flop ◽  
Deep Impact ◽  
Power Pulse

Flip-flop is an important unit in digital integrated circuits, whose characteristics have a deep impact on the performance of the circuits. To reduce the power dissipation of flip-flops, clock triggering edge control technique is proposed, which is feasible to block one or two triggering edges of a clock cycle if they are redundant in dual-edge pulse-triggered flip-flops (DEPFFs). Based on this technique, redundant pulses can be suppressed when the input stays unchanged, and all the redundant triggerings are eliminated to reduce redundant transitions at the internal nodes of the flip-flop, so the power dissipation can be decreased. Then a novel DEPFF based on clock triggering edge control (DEPFF-CEC) technique is proposed. Based on the SMIC 65-nm technology, the post layout simulation results show that the proposed DEPFF-CEC gains an improvement of 8.03–39.83% in terms of power dissipation when the input switching activity is 10%, as compared with its counterparts. Thus, it is suitable for energy-efficient designs whose input data switching activity is low.

scholarly journals The deep impact of the COVID‐19 pandemic on medical students: An online cross‐sectional study evaluating Turkish students’ anxiety

2021 ◽  
Author(s):  
Özlem Kuman Tunçel ◽  
Selin Ece Taşbakan ◽  
Deniz Gökengin ◽  
Hüseyin Aytaç Erdem ◽  
Tansu Yamazhan ◽  
...  
Keyword(s):  
Medical Students ◽  
Cross Sectional Study ◽  
Sectional Study ◽  
Cross Sectional ◽  
Deep Impact

scholarly journals Observations of Comet 9P/Tempel 1 around the Deep Impact event by the OSIRIS cameras onboard Rosetta

Icarus ◽  
2007 ◽  
Vol 187 (1) ◽  
pp. 87-103 ◽  
Author(s):  
Horst Uwe Keller ◽  
Michael Küppers ◽  
Sonia Fornasier ◽  
Pedro J. Gutiérrez ◽  
Stubbe F. Hviid ◽  
...  
Keyword(s):  
Impact Event ◽  
Deep Impact

The peridotite deformation cycle in cratons and the deep impact of subduction

2021 ◽  
pp. 229029
Author(s):  
Emily J. Chin ◽  
Benjamin Chilson-Parks ◽  
Yuval Boneh ◽  
Greg Hirth ◽  
Alberto Saal ◽  
...  
Keyword(s):  
Deep Impact ◽  
Deformation Cycle
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