297results about How to "Suppress emission" patented technology

Apparatus and method for amplifying laser signals using segments of fibers of differing core diameters and/or differing cladding diameters to suppress amplified spontaneous emission and non-linear effects such as four-wave mixing (FWM), self-phase modulation, and stimulated Brillouin and/or Raman scattering (SBS/SRS). In some embodiments, different core sizes have different sideband spacings (spacing between the desired signal and wavelength-shifted lobes). Changing core sizes and providing phase mismatches prevent buildup of non-linear effects. Some embodiments further include a bandpass filter to remove signal other than the desired signal wavelength and/or a time gate to remove signal at times other than during the desired signal pulse. Some embodiments include photonic-crystal structures to define the core for the signal and/or the inner cladding for the pump. Some embodiments include an inner glass cladding to confine the signal in the core and an outer glass cladding to confine pump light in the inner cladding.

A housing device, such as rear view mirror, with built-in camera can include an infrared projection device with an infrared light source for irradiating infrared light onto an image capture region for the camera. The camera can display a sensitivity to visible light and infrared light, and can be built into the mirror housing which is mounted to a vehicle and contains a mirror used for visual checking purposes. The infrared projection device can include a light transmission cover. The cover can be positioned in an infrared irradiation direction of the infrared light source, can be formed from a material that is impenetrable to visible light and transmits only infrared light, and can be attached to the mirror housing in an integral manner.

The present invention relates to a resonant DC-DC power converter assembly comprising a first resonant DC-DC power converter and a second resonant DC-DC power converter having identical circuit topologies. A first inductor of the first resonant DC-DC power converter and a second inductor of the second resonant DC-DC power converter are configured for magnetically coupling the first and second resonant DC-DC power converters to each other to forcing substantially 180 degrees phase shift, or forcing substantially 0 degree phase shift, between corresponding resonant voltage waveforms of the first and second resonant DC-DC power converters. The first and second inductors are corresponding components of the first and second resonant DC-DC power converters.

Cylindrically curved slopes successively inner-reflect illumination light which reaches a back face or emission face of a light guide plate via an upper edge of an incidence face. The curved slopes give the light diverse propagation directions after inner-reflection. This avoids the viewer from observing a strongly irradiated edge, thereby reducing reflective appearance. Inner-reflection by the curved slopes also gives diverse propagation directions to illumination light coming via other edges, thereby reducing reflective appearance. Curved surface profile is given to valleys involved in a great number of projection rows running in a direction approximately perpendicular to the incidence face, and may be further given to the projection rows. The valleys are provided with curved surface profile within a curved-surface-profile-giving-area around the incidence face or, in addition to this, around flank faces of the light guide plate. The curved surface profile varies gradually around a boundary of the curved-surface-profile-giving-area to avoid sudden profile changing which would bring undesirable effects.

There are provided a fuel addition means which adds fuel into the exhaust, a NOx storage reduction catalyst by which NOx which has been stored is reduced by fuel which is added by the fuel addition means, and a control means which, based upon the intake air amount of the internal combustion engine, the fuel supply amount to the internal combustion engine, the target air/fuel ratio during NOx reduction, and the rich continuation period over which this target air/fuel ratio should be continued, calculates an added fuel amount to be added during this rich continuation period, and controls the fuel addition means so that fuel is added by dispersing this calculated added fuel amount over this rich continuation period.

A fuel cell system is provided, the system comprising: a fuel cell (1) configured to generate electric power by use of a fuel gas; a reformer (2) configured to generate the fuel gas by reforming a raw material; a combustion burner (2a) configured to supply heat for reforming; a raw material feeder (10) configured to control the feed rate of combustion fuel to the combustion burner; a combustion fan (2b) configured to supply air to the combustion burner; a fuel gas passage (R1, R4); an off gas passage (R3, R5); a bypass passage (R2); a switching valve (8); and a controller (101), wherein the inside of the fuel cell is filled with the raw material before the fuel gas is supplied, and wherein the controller controls the raw material feeder so as to reduce the feed rate of the combustion fuel to the combustion burner when controlling the switching valve so as to shut off the bypass passage to supply the fuel gas generated in the reformer to the fuel cell. This fuel cell system is environmentally-friendly and capable of suppressing the emission of carbon monoxide at the start of a power generating operation to mitigate the adverse effect upon the ecosystem.

An improved thermionic cathode is provided. The cathode has a carbon-coated cone surface and reduced cone angle (e.g. typically 60 degrees or less) that delivers an electron beam with high angular intensity and brightness and exhibits increased longevity.

.[.Herein disclosed are a liquid crystal display device and a data processing device, which can have their frame portions reduced in area to reduce the size and weight by extracting the terminals of video signals to only one side of a liquid crystal display panel and by arranging a video signal line driving circuit substrate to be connected with the terminals, only at one side of the display panel..]. .Iadd.A liquid crystal display includes upper and lower casings for holding a liquid crystal display panel and substrates. The casings are provided with at least one of fixing pawls and recesses for receiving the fixing pawls so as to enable the connection of the casings. .Iaddend.

An object of the present invention is to provide a gas turbine combustor that supports hydrogen-containing gas having a high burning velocity and is capable of performing low NOx combustion without reducing reliability of a burner. A first fuel nozzle is provided upstream of a combustion chamber and supplies fuel for activation and hydrogen-containing gas. The combustor has a primary combustion zone, a reduction zone and a secondary combustion zone. In the primary combustion zone, the fuel supplied from the first fuel nozzle is combusted under a fuel rich condition to form a burned gas containing a low concentration of oxygen. In the reduction zone, a hydrogen-containing gas is injected into the combustion chamber through a second fuel injection hole from a second fuel nozzle so that NOx generated in the primary combustion zone is reduced by an oxygen reaction of the hydrogen. In the secondary combustion zone, air for lean combustion is supplied into the combustion chamber so that unburned part of fuel is combusted under a fuel lean condition.

A new monolithic resonator metasurface design achieves ultra-high Q-factors while using only one resonator per unit cell. The metasurface relies on breaking the symmetry of otherwise highly symmetric resonators to induce intra-resonator mixing of bright and dark modes (rather than inter-resonator couplings), and is scalable from the near-infrared to radio frequencies and can be easily implemented in dielectric materials. The resulting high-quality-factor Fano metasurface can be used in many sensing, spectral filtering, and modulation applications.

A heavy metal oxide glass selected from germanate, tellurite and bismuth oxide glasses provides a host for highly efficient Thulium doped 2 μm oxide glass and fiber lasers. The concentration of Thulium ions is high enough that energy transferred by the phenomenon of cross-relaxation will enhance laser emission at 2 μm and suppress emission at 1.5 μm so that 2 μm emission is dominant.

A purge solenoid valve is opened to introduce an atmospheric pressure into a fuel tank, the purge solenoid valve is closed to operate a negative pressure pump, and set an internal pressure of the tank to a reference pressure Pb. Then, a changeover valve is closed, and the purge solenoid valve is opened to cause a canister to communicate with an intake passage. Further, the changeover valve is opened, and the purge solenoid valve is closed. Then, a first tank internal pressure Po is detected and subtracted from the reference pressure Pb. If a calculated first pressure deviation ΔPo is larger than a first threshold ΔP1, it is determined that there is no open sticking in a sealing valve.

All-optical quasi-phase matching (QPM) uses a train of counterpropagating pulses to enhance high-order harmonic generation (HHG) in a hollow waveguide. A pump pulse enters one end of the waveguide, and causes HHG in the waveguide. The counterpropagation pulses enter the other end of the waveguide and interact with the pump pulses to cause QPM within the waveguide, enhancing the HHG.