Abstract: A shoe includes a sole, an actuator and a transducer. The actuator is mounted on one side of the sole. The transducer is mounted within the sole and includes a micro-motor, a link structure and a heater. The link structure is positioned between the micro-motor and the actuator and configured to move the micro-motor to generate electric energy. The heater is electrically coupled to the micro-motor and configured to convert the electric energy provided by the micro-motor to heat. When the actuator deforms or restores its deformation, the link structure moves thereby enabling the micro-motor to generate electric energy for the heater.

Abstract: A shoe includes a sole, an actuator and a transducer. The actuator is mounted on one side of the sole. The transducer is mounted within the sole and includes a micro-motor, a link structure and a heater. The link structure is positioned between the micro-motor and the actuator and configured to move the micro-motor to generate electric energy. The heater is electrically coupled to the micro-motor and configured to convert the electric energy provided by the micro-motor to heat. When the actuator deforms or restores its deformation, the link structure moves thereby enabling the micro-motor to generate electric energy for the heater.

Abstract: A power plug includes a body, and one or more electrically conductive elements. Each of the one or more electrically conductive elements having a conductive insert extending out from the body and a conductive base portion enclosed, and electrically insulated, by the body. The each base portion of the one or more conductive elements is connectable to a conductive input. At least one of the conductive insert of the one or more conductive elements has a first portion and a second portion, the first portion of the insert being closer to the body and having a smaller cross-sectional area than the second portion and the first portion being substantially enclosed by an insulated housing. An insulated housing substantially encloses the first portion of the at least one conductive insert having a first and second portion.

Abstract: A mechanical keyboard includes a base plate, a key assembly mounted on the base plate and a light source. The base plate defines a number of separate mounting holes therein. The key assembly includes a number of press keys. Each of the number of press keys is mounted in one of the number of mounting holes respectively. The press keys include a number of transparent portions. The transparent portions cooperatively form a decorative pattern. The light source is mounted in the base plate and located below the decorative pattern. Therein, the light source is used to transmit light through the at least one transparent portion, thereby illuminating the decorative pattern.

Abstract: A spectrograph with a first concave spectrographic diffraction grating is positioned to receive light from an input light source. The first concave spectrographic diffraction grating is configured to provide a diffracted light output dispersing the components of the input light source in a first dispersion direction with a first angular orientation with respect to the plane of the grating. The dispersion forms the input light into an intermediate spectrum. The intermediate spectrum is formed in a focal surface by the once diffracted light. A slit is substantially positioned on the focal surface. A second concave diffraction grating is positioned to receive once diffracted light from the slit and configured to provide a twice diffracted light output, the second concave diffraction grating dispersing the components of the input light source in a second diffraction direction with a second angular orientation with respect to the plane of the grating.

Abstract: A spectrograph with a first concave spectrographic diffraction grating is positioned to receive light from the input light source is configured to provide a diffracted light output dispersing the components of the input light source in a first direction. The dispersion forms the input light into an intermediate spectra. The intermediate spectra is formed in a focal surface by the once diffracted light. A slit is substantially positioned on the focal surface. A second concave diffraction grating is positioned to receive once diffracted light from the slit and configured to provide a twice diffracted light output, the second concave diffraction grating dispersing the components of the input light source in a second direction. The second direction is different from the first direction, the dispersion forming the input light into an output spectra.

Abstract: A spectrograph with a first concave spectrographic diffraction grating is positioned to receive light from the input light source is configured to provide a diffracted light output dispersing the components of the input light source in a first direction. The dispersion forms the input light into an intermediate spectra. The intermediate spectra is formed in a focal surface by the once diffracted light. A slit is substantially positioned on the focal surface. A second concave diffraction grating is positioned to receive once diffracted light from the slit and configured to provide a twice diffracted light output, the second concave diffraction grating dispersing the components of the input light source in a second direction. The second direction is different from the first direction, the dispersion forming the input light into an output spectra.