Simulation of High-Speed Cavity Flows in a Scramjet Engine by the Space-Time CESE Method

This chapter notes that the twin paradox is the best-known thought experiment associated with Einstein's theory of relativity. An astronaut who makes a journey into space in a high-speed rocket will return home to find he has aged less than his twin who stayed on Earth. This result appears puzzling, as the homebody twin can be considered to have done the travelling with respect to the traveller. Hence, it is called a “paradox”. In fact, there is no contradiction, and the apparent paradox has a simple resolution in special relativity with infinite flat space. In general relativity (dealing with gravitational fields and curved space-time), or in a compact space such as the hypersphere or a multiply connected finite space, the paradox is more complicated, but its resolution provides new insights about the structure of space–time and the limitations of the equivalence between inertial reference frames.

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Motion compensation method for high speed target based on space-time-frequency joint processing

2017 IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC) ◽

10.1109/icspcc.2017.8242438 ◽

2017 ◽

Author(s):

Wang Zhao ◽

Wang Pengyi ◽

Wang Zhao ◽

Su Weimin ◽

Gu Hong

Keyword(s):

Motion Compensation ◽

High Speed ◽

Space Time ◽

Compensation Method ◽

Joint Processing ◽

Time Frequency

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Space-Time Equalizers for MIMO High Speed WCDMA Downlinks

IEEE Transactions on Wireless Communications ◽

10.1109/twc.2007.05935 ◽

2007 ◽

Vol 6 (7) ◽

pp. 2582-2592 ◽

Cited By ~ 5

Author(s):

Markku Juntti ◽

Kari Hooli ◽

Kai Kiiskila ◽

Jari Ylioinas

Keyword(s):

High Speed ◽

Space Time

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Rigorous study of low-complexity adaptive space-time block-coded MIMO receivers in high-speed mode multiplexed fiber-optic transmission links using few-mode fibers

10.1117/12.2251690 ◽

2017 ◽

Author(s):

Yi Weng ◽

Xuan He ◽

Junyi Wang ◽

Zhongqi Pan

Keyword(s):

High Speed ◽

Fiber Optic ◽

Low Complexity ◽

Space Time ◽

Time Block ◽

Mimo Receivers ◽

Rigorous Study ◽

Speed Mode

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DISCRETE-TIME MODELLING OP DISPERSION IN ESTURARIES

Coastal Engineering Proceedings ◽

10.9753/icce.v17.182 ◽

1980 ◽

Vol 1 (17) ◽

pp. 182

Author(s):

T. Wood

Keyword(s):

Partial Differential Equations ◽

Differential Equations ◽

High Speed ◽

Transport Theory ◽

State Parameter ◽

Space Time ◽

Tidal River ◽

Primary Concern ◽

Transport Parameters ◽

Partial Differential

This paper aims to put forward a case in favour of a simple discretetime model describing mixing in an estuary. The model derives from the remarkably simple concepts developed by Ketchum (1951 a,b) which describe mixing in terms of tidal prism exchanges between segments. The author's view is that Ketchum1s ideas were abandoned before they were fully explored. A major factor was the advent of the high-speed computer which opened up the possibility of using an approach based on the space-time formulation of the problem in terms of the partial differential equations of transport theory. Intrinsically this approach, based on a continuum description, is more attractive than a gross description based on relatively large segments: one obvious reason is the possibility of providing a comprehensive space-time prediction of the spread of a pollutant. In practice, though, significant problems arise in its use: in particular, the following can be mentioned - a) substantial computing costs relating to computer program development and machine time b) specification of transport parameters inherent in the partial differential equations of transport: for example, dispersion coefficients c) model validation and state/parameter estimation. The last of these is the primary concern of this paper. It is probably true to say that, to date, too little attention has been given to these topics, in the context of estuarine modelling. The point to be made is that there is small justification in using a sophisticated description of a system if the resulting predictions of the model cannot be effectively validated. The ideas used in this paper stem from those put forward by Beck and Young (1975) in studies on non-tidal river pollution. The subsequent discussion suggests an extension to estuarine systems-.

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