2-D Spectrum Imaging Algorithm for Hybrid Spaceborne-Airborne Bistatic SAR Based on Space and Time Domain Expansion

2012 ◽  
Vol 500 ◽  
pp. 522-528
Author(s):  
Wei Ye ◽  
Xiao Ling Zhang ◽  
Yue Yang
Keyword(s):  
Theoretical Analysis ◽  
Time Domain ◽  
Mixed Method ◽  
The Other ◽  
Imaging Algorithm ◽  
Space And Time ◽  
Bistatic Sar ◽  
Character Study ◽  
Traditional Algorithm ◽  
Spectrum Imaging

In this paper, a new 2-D spectrum focusing algorithm for hybrid spaceborne-airborne bistatic SAR based on space and time domain expansion is proposed. In order to obtain 2-D spectrum, the most of frequency domain algorithm is based on expanding the range history in time domain, but this method can’t represent the spatial characters of scatterer directly; on the other hand, the expansion of range history in space domain doesn’t good to get 2-D spectrum by the principle of stationary phase (PSP). Comparing with traditional algorithm, the algorithm proposed in this paper integrates methods of space and time domain expansion. This mixed-method has advantages that will both represent the spatial character of scatterer directly and get 2-D spectrum by PSP conveniently. It is very beneficial to theoretical analysis and spatial character study of bistatic SAR which has spatial variant characteristic. The validity of algorithm is confirmed through the simulated results.

Spaceborne/Airborne Hybrid Sliding Spotlight Bistatic SAR Range-Doppler Imaging Algorithm

2011 ◽  
Vol 33 (8) ◽  
pp. 1851-1857
Author(s):  
Fang Zhou ◽  
Guang-cai Sun ◽  
Meng-dao Xing ◽  
Yu Tang ◽  
Zheng Bao
Keyword(s):  
Doppler Imaging ◽  
Imaging Algorithm ◽  
Bistatic Sar

USE OF THE GALAXY AS A TOOL FOR SPATIAL AND TEMPORAL ORIENTATION DURING THE EARLY ISLAMIC PERIOD AND UP TO THE 15TH CENTURY

2021 ◽  
Vol 31 (1) ◽  
pp. 1-44
Author(s):  
Andreas Eckart
Keyword(s):  
Milky Way ◽  
The Other ◽  
Temporal Orientation ◽  
Islamic Period ◽  
Space And Time ◽  
15Th Century ◽  
Other Hand ◽  
The Galaxy ◽  
Early Islamic Period ◽  
Early Islamic

AbstractWe study to what extent the Milky Way was used as an orientation tool at the beginning of the Islamic period covering the 8th to the 15th century, with a focus on the first half of that era. We compare the texts of three authors from three different periods and give detailed comments on their astronomical and traditional content. The text of al-Marzūqī summarises the information on the Milky Way put forward by the astronomer and geographer ʾAbū Ḥanīfa al-Dīnawarī. The text makes it clear that in some areas the Milky Way could be used as a geographical guide to determine the approximate direction toward a region on Earth or the direction of prayer. In the 15th century, the famous navigator Aḥmad b. Māǧid describes the Milky Way in his nautical instructions. He frequently demonstrates that the Milky Way serves as a guidance aid to find constellations and stars that are useful for precise navigation on land and at sea. On the other hand, Ibn Qutayba quotes in his description of the Milky Way a saying from the famous Bedouin poet Ḏū al-Rumma, which is also mentioned by al-Marzūqī. In this saying the Milky Way is used to indicate the hot summer times in which travelling the desert was particularly difficult. Hence, the Milky Way was useful for orientation in space and time and was used for agricultural and navigational purposes.

scholarly journals Natural Science and Supernatural Thought Experiments

Religions ◽  
2019 ◽  
Vol 10 (6) ◽  
pp. 389
Author(s):  
James Robert Brown
Keyword(s):  
Natural Science ◽  
Thought Experiment ◽  
Thought Experiments ◽  
The Other ◽  
Space And Time ◽  
Wide Range ◽  
The Difference ◽  
Theological Thought

Religious notions have long played a role in epistemology. Theological thought experiments, in particular, have been effective in a wide range of situations in the sciences. Some of these are merely picturesque, others have been heuristically important, and still others, as I will argue, have played a role that could be called essential. I will illustrate the difference between heuristic and essential with two examples. One of these stems from the Newton–Leibniz debate over the nature of space and time; the other is a thought experiment of my own constructed with the aim of making a case for a more liberal view of evidence in mathematics.

A SIMPLE OBSERVER OF THE HYPERCHAOTIC RÖSSLER SYSTEM

2010 ◽  
Vol 24 (22) ◽  
pp. 4325-4331
Author(s):  
XING-YUAN WANG ◽  
JUN-MEI SONG
Keyword(s):  
Dynamical System ◽  
Time Domain ◽  
Global Exponential Stability ◽  
Observer Design ◽  
The Other ◽  
State Observation ◽  
Rossler System ◽  
Error System ◽  
Rössler System ◽  
The Time Domain

This paper studies the hyperchaotic Rössler system and the state observation problem of such a system being investigated. Based on the time-domain approach, a simple observer for the hyperchaotic Rössler system is proposed to guarantee the global exponential stability of the resulting error system. The scheme is easy to implement and different from the other observer design that it does not need to transmit all signals of the dynamical system. It is proved theoretically, and numerical simulations show the effectiveness of the scheme finally.

scholarly journals Efficient Time-Domain Image Formation with Precise Topography Accommodation for General Bistatic SAR Configurations

2011 ◽  
Vol 47 (4) ◽  
pp. 2949-2966 ◽  
Author(s):  
Marc Rodriguez-Cassola ◽  
Pau Prats ◽  
Gerhard Krieger ◽  
Alberto Moreira
Keyword(s):  
Time Domain ◽  
Image Formation ◽  
Bistatic Sar

THEORETICAL ANALYSIS AND EXPERIMENT OF A NOVEL DEP CHIP WITH 3-D SILICON ELECTRODES

2005 ◽  
Vol 15 (02) ◽  
pp. 231-236 ◽  
Author(s):  
LIMING YU ◽  
FRANCIS E. H. TAY ◽  
GUOLIN XU ◽  
CIPRIAN ILIESCU ◽  
MARIOARA AVRAM
Keyword(s):  
Theoretical Analysis ◽  
Applied Voltage ◽  
Microfluidic Channel ◽  
The Other ◽  
Yeast Cells ◽  
Applied Potential ◽  
Dielectrophoretic Force ◽  
Joule Effect ◽  
Doped Silicon ◽  
Planar Electrodes

This paper presents a novel dielectrophoresis (DEP) device where the DEP electrodes define the channel walls. This is achieved by fabricating microfluidic channel walls from highly doped silicon so that they can also function as DEP electrodes. Compared with planar electrodes, this device increases the exhibited dielectrophoretic force on the particle, therefore decreases the applied potential and reduces the heating of the solution. A DEP device with triangle electrodes has been designed and fabricated. Compared with the other two configurations, semi-circular and square, triangle electrode presents an increased force, which can decrease the applied voltage and reduce the Joule effect. Yeast cells have been used to for testing the performance of the device.

An Omega-$k$ Imaging Algorithm for Translational Variant Bistatic SAR Based on Linearization Theory

2014 ◽  
Vol 11 (3) ◽  
pp. 627-631 ◽  
Author(s):  
Zhongyu Li ◽  
Junjie Wu ◽  
Qingying Yi ◽  
Yulin Huang ◽  
Jianyu Yang
Keyword(s):  
Imaging Algorithm ◽  
Bistatic Sar

Finally, Our Own Brown! (?)

2012 ◽  
Vol 45 (2) ◽  
pp. 267-289 ◽  
Author(s):  
Yifat Bitton
Keyword(s):  
African American ◽  
Theoretical Analysis ◽  
Supreme Court Decision ◽  
The Other ◽  
Court Decision ◽  
High Court ◽  
Court Of Justice ◽  
Us Supreme Court ◽  
Distinctive Group ◽  
Contextual Reality

The decision in Noar Kahalacha, an anti-segregation in education case that was recently delivered by the Israeli High Court of Justice, has been ‘naturally’ celebrated as the ‘Israeli Brown’. But is it? This article points to the differences between the monumental US Supreme Court decision of Brown and the Israeli Brown-equivalent – Noar Kahalacha. It contends that the two cases bear differences that stem from the divergent patterns of discrimination they represent, and that they reflect these differences squarely. The discrimination patterns reflected by the cases differ by virtue of traits that are traditionally overlooked in antidiscrimination theoretical analysis. Comparing the two cases, therefore, allows us an opportunity to revisit the notion of discrimination and its antidote, antidiscrimination. Drawing on the dichotomous concepts of de jure/de facto discrimination and difference/sameness discrimination, the article shows how these dual theoretical notions are determinative in shaping the distinctiveness of each of these cases. While the African American victims in Brown were easily recognised as a distinctive group suffering from de jure discrimination, the Mizrahi victims in Noar Kahalacha – who suffer from de facto discrimination within a Jewish hegemonic society – lacked such clear recognition. Accordingly, the discrimination narrative that Noar Kahalacha provides is very incomplete and carries only limited potential for effective application in future struggles to eliminate discriminatory practices against Mizrahis in Israel. Brown, on the other hand, carries a converse trait. Though criticised, Brown, nevertheless, strongly signifies the recognition by White America of its overarching discriminatory practices, and implies a genuine dedication to break from it. This understanding further illuminates the limitations embedded in the possibility of ‘importing’ highly contextual antidiscrimination jurisprudence from abroad into our system's highly contextual reality of discrimination.

Benessere tra differenze e disuguaglianze di genere in salute

2012 ◽  
pp. 95-113
Author(s):  
Rita Biancheri
Keyword(s):  
Theoretical Analysis ◽  
Empirical Research ◽  
Personal History ◽  
The Other ◽  
Sex And Gender ◽  
Welfare Systems ◽  
Life Context ◽  
And Gender ◽  
The One ◽  
Sick Individual

Up to now, in the traditional biomedical paradigm the terms "sex" and "gender" have either been used synonymously and the insertion of gender among the determining elements of conditions of wellbeing/disease has been difficult, and obstructed by disciplinary rigidities that retarded the acceptance of an approach which had already been largely found to be valid in other areas of research. The effected simplification demonstrated its limitations in describing the theme of health; but if, on the one hand, there has been a growing awareness of a subject which can in no way be considered "neutral", on the other hand there continues to be insufficient attention, both in theoretical analysis and in empirical research, given to female differences. The article is intended to support that the sick individual is a person, with his/her genetic heritage, his/her own cultural acquisitions and personal history, and own surrounding life context; but these and similar factors have not traditionally been taken into consideration by official medicine and welfare systems, despite a hoped-for socio-health integration.

scholarly journals A Method for Fabricating Arrays of Nanopatterns with the Feature Size beyond Diffraction Limit

2008 ◽  
Vol 2008 ◽  
pp. 1-4 ◽  
Author(s):  
Shuhong Li ◽  
Lifang Shi ◽  
Xiaochun Dong ◽  
Chunlei Du ◽  
Yudong Zhang
Keyword(s):  
Time Domain ◽  
Finite Difference Time Domain ◽  
Diffraction Limit ◽  
Evanescent Waves ◽  
The Other ◽  
Optical Intensity ◽  
Polystyrene Spheres ◽  
Feature Size ◽  
Contact Points ◽  
Difference Time

A convenient lithographic technique is proposed in this paper, which can be used to produce subdiffraction-limit arrays of nanopatterns over large areas (about several square centimeters). An array of polystyrene spheres (PS) is arranged on the surface of a layer of silver which has a thickness of about tens of nanometers. With the normal illumination light of wavelength 365 nm perpendicular to the substrate, PS can generate an array of optical patterns with high intensity at their contact points with silver. By designing the silver slab, the evanescent waves that carry subwavelength information about the optical patterns are substantially enhanced, while propagating components are restrained. In the photoresist which is on the other side of silver, the optical intensity is redistributed and subdiffraction-limit patterns are obtained after exposure and development. Simulation by finite-difference time-domain (FDTD) and experiments were carried out to verify the technique. The results show that by using PS with diameter of 600 nm, nanopatterns with dimension of less than 80 nm can be obtained.

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