We designed an optical add/drop multiplexer for orbital-angular-momentum (OAM)-multiplexed data links by taking advantage of the ring-shaped intensity profile of OAM beams. We demonstrated adding/dropping a single OAM beam from three multiplexed OAM beams using liquid-crystal-on-silicon-based diffraction optical elements. For multiplexed OAM beams carrying 100 Gbit/s quadrature phase-shift-keyi...

Far-field RF energy transport is an alternative for powering wireless sensor nodes. The major issues concerning the technology are path loss and transmitted power restrictions. After optimizing all subsystems of a rectifying antenna (rectenna) the power incident upon the rectenna can be increased without increasing the transmit power. Thereto the transmitted energy must be directed to the recte...

Nuclear energy is one of the most popular topics of today’s publication market. The literature about the pros and cons of nuclear power may easily fill a whole library. Is there anything new to add to this voluminous body of arguments and contra-arguments that would justify editing another book on nuclear energy? Andrew Blowers and David Pepper obviously felt that way and published a reader on ...

Current web security systems need Intrusion Detection and Prevention Systems (IDPS), web proxies and firewalls to protect the websites from malicious network traffic. All these functions come at a cost for a web farm and add to power costs. Our previous work has concluded that the web server detection of application layer DDoS attacks is far more power efficient than an equivalent IDPS. This pa...

In this paper, we construct new infinite families of regular graphs of girth 7 of smallest order known so far. Our constructions are based on combinatorial and geometric properties of (q + 1, 8)-cages, for q a prime power. We remove vertices from such cages and add matchings among the vertices of minimum degree to achieve regularity in the new graphs. We obtain (q + 1)-regular graphs of girth 7...