Abstract: Systems and methods of receiving voice input are disclosed herein. In one embodiment, for example, a network microphone device is configured to cause an output of a feedback element only if received voice input data comprises the valid wake word. In another embodiment, for example, a network microphone device is configured to determine a type of command request in voice input data, and cause output of a feedback element corresponding to the determined type of command request. In one embodiment, for example, a media playback system is configured to play back media content via first and second playback devices, and further configured to cause output, via the second playback device, of a feedback element corresponding to voice input received at the second playback device.

Abstract: A seat with a contoured pan comprised of two concavely shaped pads adapted to support the thighs of a user at an optimal selected angle of 27 degrees to the horizontal plane. The combined features enable a user to be directed into a comfortable seating position that emulates the shape of the spine when standing.

Abstract: A seat with a contoured pan comprises of two concavely shaped pads adapted to support the thighs of a user at an optimal angle to the horizontal plane. The seat further includes a linkage between the pads that allows for roll movement as a user sits on the seat. The combined features enable a user to be directed into a comfortable seating position that emulates the shape of the spine when standing.

Abstract: This invention provides a system and method that enables the use of incoherent light sources, such as light emitting diodes, to provide for the detection of gaseous species which exhibit broadband absorption features (e.g., nitrogen dioxide and the halogen gases). The light emitting diode (LED) is an ideal light source for such an arrangement in that it can be modulated at high frequencies (allowing for omission of external modulation equipment) and provides sufficient illumination within a reasonably narrow wavelength band as compared to, for instance, an incandescent light source. A further advantage of a LED as a light source compared to alternatives such as a gas discharge or arc lamp is that the light output of the LED is highly stable, limited by the stability of the current source used to drive it. Use of a confocal or near-confocal resonant optical cavity maximizes coupling of the light source to the cavity.

Abstract: The present invention provides an in vitro T-lymphopoiesis system in which a population of T-cells is produced from precursor cells expressing CD34. The T-lymphopoiesis system of the present invention produces a population of T-cells of which approximately 17-74% express CD2, approximately 1.5-34% express CD3, and approximately 16-61% express CD4, and approximately 0-15% express CD8. A method of producing such a population of T-cells in vitro, as well as various compositions including T-cells of the present invention, are also provided.

Abstract: Disclosed herein is a process for producing a thin film of epitaxial material on a substrate surface at low temperatures under ultrahigh vacuum conditions. In general, precursor compounds are deposited, and converted into the epitaxial material, on the substrate surface at a temperature at which they undergo no substantial dissociation. By way of example, a beam-deposited admixture of dimethyl tellurium and dimethyl cadmium is efficiently converted to an epitaxial cadmium telluride crystal on the surface of a GaAs(100) substrate placed in an ultrahigh vacuum chamber by low power, 193 nm laser irradiation (pulse fluence approximately 6 mJ cm.sup.-2) at substrate temperature of -150.degree. C. and by subsequent annealing at 200.degree. C. for 30 seconds. In addition to efficient use of precursors, this process also permits considerable improvement of pattern resolution.