Abstract: A passive flow modulation device for a machine defining an axial direction and a radial direction, the passive flow modulation device including: a first ring with a first coefficient of thermal expansion; a second ring disposed coaxially with the first ring and positioned at least partially inward of the first ring along the radial direction, spaced from the first ring along the axial direction, or both, the first ring, the second ring, or both defining at least in part one or more passages, the second ring with a second coefficient of thermal expansion that is less than the first coefficient of thermal expansion to passively modulate a size of the one or more passages during operation.

Abstract: A method of neutralizing a polysiloxane having acidic residuals is disclosed. The method involves contacting a polysiloxane having acidic residuals with a carbon solid, and separating the carbon solid from the polysiloxane. This invention is particularly useful to neutralize residual acid polymerization catalysts in organopolysiloxanes.

Abstract: A method of neutralizing a polysiloxane having acidic residuals is disclosed. The method involves contacting a polysiloxane having acidic residuals with a carbon solid, and separating the carbon solid from the polysiloxane. This invention is particularly useful to neutralize residual acid polymerization catalysts in organopolysiloxanes.

Abstract: A wavelength-tunable distributed feedback (DFB) laser is disclosed where the lasing wavelength can be adjusted by adjusting the bias current of the laser diode. Since the output power of the laser diode also changes with the bias current, a one-to-one correspondence between the lasing wavelength and the output power of the laser can be established. Consequently, the lasing wavelength can be measured directly from the photocurrent of a power monitoring detector facing the back-end of the laser diode. This provides an extremely simple method for wavelength monitoring.

Abstract: A wavelength-tunable distributed feedback (DFB) laser is disclosed where the lasing wavelength can be adjusted by adjusting the bias current of the laser diode. Since the output power of the laser diode also changes with the bias current, a one-to-one correspondence between the lasing wavelength and the output power of the laser can be established. Consequently, the lasing wavelength can be measured directly from the photocurrent of a power monitoring detector facing the back-end of the laser diode. This provides an extremely simple method for wavelength monitoring.