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That's one conclusion from a study of the movement patterns of the shovel-nosed snake, a native of the Mojave Desert of the southwest United States. The…
A new study identifies a gene that is especially active in aggressive subtypes of breast cancer. The research suggests that an overactive BCL11A gene drives…
Common free space optical communication systems use intensity modulation, which has the drawback of a low spectral efficiency. However, OMIMO is an improved concept for free space optical (FSO) communication. To enhance efficiency a coherent transmission is used with incoherent light sources.
At the transmitter a baseband signal is phase-shifted for precoding, spatial multiplexing or beam forming. After upconversion of the baseband signal to a bandpass signal a DC-offset is added. This signal drives a light source, e. g. an LED or a laser diode by direct modulation. The receiver works with a reverse scheme. For transmitting and receiving a plurality of light source and photo detector can be used in parallel, respectively, to establish an optical MIMO concept.
2STEP-CP is a method of communication between two (mobile) signal sources and a relay station with two antennas. In a first time slot, the two signal sources send a first signal, respectively, in a second time slot a second signal. Based on the respective first and second signals the relay station generates a first and a second network-coded signal. In a third time slot, the first network-coded signal is sent via the first antenna and the second network-coded signal is sent via the second antenna. In a fourth time slot, the two network-encoded signals are sent via the respective other antenna. Based on the signal the signal sources have sent in the first two time slots, both signal sources are able to decode the network coded signals from the relay station. The process is also adaptable to a higher number of signal sources and antennas per relay station.
Topology, a branch of mathematics classifying geometric objects, has been exploited by physicists to predict and describe unusual quantum phases: the…
The new design for energy storage systems is based on novel, prism-shaped housings for battery cells. Instead of conventionally contacting the cells via the cylinder covers the novel cell housing enables electrical connection of the individual cells by pressing together the side surfaces. The battery system is readily separable and improves safety, transport and maintenance. In addition, the invention enables flexible and rapid system design and cost-effective development processes.