11,629 research outputs found
Use of a multi-look unfocussed SAR processor on spacecraft
Two methods of processing signals from a multi-look unfocussed synthetic-aperture radar are considered. A saving in the processor complexity is achieved in comparison to a fully focussed SAR system at the expense of slightly greater clutter levels and poorer along-track resolution. In addition, lower power consumption enables the unfocussed processor to increase the number of looks to compensate in part for the reduced resolution
Randomized Benchmarking as Convolution: Fourier Analysis of Gate Dependent Errors
We provide an alternative proof of Wallman's [Quantum 2, 47 (2018)] and
Proctor's [Phys. Rev. Lett. 119, 130502 (2017)] bounds on the effect of
gate-dependent noise on randomized benchmarking (RB). Our primary insight is
that a RB sequence is a convolution amenable to Fourier space analysis, and we
adopt the mathematical framework of Fourier transforms of matrix-valued
functions on groups established in recent work from Gowers and Hatami [Sbornik:
Mathematics 208, 1784 (2017)]. We show explicitly that as long as our faulty
gate-set is close to some representation of the Clifford group, an RB sequence
is described by the exponential decay of a process that has exactly two
eigenvalues close to one and the rest close to zero. This framework also allows
us to construct a gauge in which the average gate-set error is a depolarizing
channel parameterized by the RB decay rates, as well as a gauge which maximizes
the fidelity with respect to the ideal gate-set
Dangerous women of Hong Kong? Media construction of stigma in female sex workers
This study used a cultural model analysis to examine the Hong Kong print media's social construction of stigma in respect to female sex workers. An analysis was conducted on captions and main headlines of two newspaper (Chinese and English) media in Hong Kong between the years 2003-2006. A total of 591 articles on sex workers were recruited in the analysis with 422 located from the Ming Pao and 169 articles from the SCMP. In Hong Kong, as in elsewhere, sex workers were commonly labeled as the sources of sexually transmitted diseases and as women who endangered the public safety through socially unacceptable occupations. They were also portrayed as "ugly", "weak" and "powerless" in the articles identified. We conclude the Hong Kong print media plays a significant role in contributing to the stigmatization of sex workers, heightening health risk and vulnerability. Such social construction of public stigma then in turn, can be argued to contribute to a lessened propensity for female sex workers both seek and engage with formal health services
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