We present a Hubble Space Telescope Advanced Camera for Surveys (ACS) weak-lensing study of RX J0849+4452 and RX J0848+4453, the two most distant (at z = 1.26 and z = 1.27, respectively) clusters yet measured with weak-lensing. The two clusters are separated by ∼ 4 from each other and appear to form a supercluster in the Lynx field. Using our deep ACS i775 and z850 imaging, we detected weak-len...

Very little theory is available to explain the reasons underlying ACO’s success. A population–based ACO (P-ACO) variant is used to explain the reasons of elitist ACO’s success in the TSP, given a globally convex structure of the solution space. 1 Reasons Underlying ACO’s Success For this work a TSP tour is denoted as rx, the optimal tour as r∗ and a population of m tours as P = {Pi}. Distance δ...

Many cryptographic primitives rely on word rotations (R) and xor (X) to provide proper mixing. We give RX-system mixing a very general treatment and deduce some theoretical results on related probability distributions. Pure RX-systems are easy to break, so we show how to apply our theory to a more complex system that uses RX operations in combination with S-boxes. We construct an impractical (k...

We present evidence from high resolution optical spectra for the presence of bipolar jets in the bright super soft X-ray source RX J0019.8+2156, the second such discovered case after RX J0513.9-6951. The jets seem to appear and disappear over a time scale of several months. No jet precession is observed. From the velocity separation of the emission lines produced by the jets a lower limit of ∼ ...

We assessed Escherichia coli ST131 and its H30 and H30-Rx subclones for virulence genes, antimicrobial resistance, and extended-spectrum beta-lactamase (ESBL) type. Although both subclones were associated with ESBL production, H30-Rx isolates had higher resistance scores and were associated specifically with CTX-M-15. Three virulence genes (iha, sat, and iutA) were more prevalent among H30 than...

Transmission over Multiple Input Multiple Output (MIMO) radio channels is considered. When multiple Rx antennas are present, one may simultaneously increase the rate and improve performance by optimizing transmit diversity, using nonorthogonal space-time block codes. This improves the performance of MIMO systems considerably, especially when the number of Tx and Rx antennas is small. As an exam...

Although high-resolution wide-swath (HRWS) SAR imaging and ground moving target indication (GMTI) systems from the system architecture point of view look quite similar (both system types employ multiple receiving (RX) channels arranged along azimuth direction), they generally need to be operated in different modes, in particular with significantly different PRFs. HRWS systems require a comparat...

A 140 GHz transmitter (Tx) and receiver (Rx) chip set has been developed in 65 nm CMOS by using on– off keying non-coherent modulation to support high speed proximity data communication. To the author’s best knowledge, it enables the first integrated multi-Gbps data link in D-band by saving power hungry frequency synthesizer, high speed data convertors and complicated digital signal processor. ...

I describe recent high-resolution X-ray spectroscopy of surface emission from nearby, thermally emitting neutron stars. I focus on RX J0720.4−3125, RX J1308.6+2127, and RX J1605.3+3249, all of which have similar temperature, but differ in the presence and strength of absorption features in their spectra. I discuss possible causes for the absorption we see in two sources, and conclude that it ma...

end tx 1 1 end tx 2 1 end rx 1 end tx 1 2 end tx 2 2 end rx 2 end tx 1 3 end tx 2 3 end rx 3 tx 2 3 tx 1 3 tx 2 2 tx 1 2 tx 2 1 tx 1 1 end tx 2 2 end tx 2 1 end tx 1 1 end tx 1 2 tx 1 2 tx 1 3 tx 1 1 tx 2 1 p 3 p 2 p 1