Abstract: A system and method for delivering variable pricing of data usage to a user device operated by a user is disclosed. The system includes a server configured with a usage monitor configured to identify the user and monitor usage patterns of the user device. The server has a pricing policy engine configured to generate pricing information based on at least one of the identity of the user and the usage patterns. The pricing policy engine is configured to transmit the pricing information to the user device. The user device is configured with a usage controller having a user interface configured to receive a delay preference selection identifying at least one delay tolerant application. The usage controller is configured to receive pricing information from the pricing policy engine and to delay data usage to the delay tolerant application based on the delay preference selection and the pricing information.

Abstract: An apparatus and method for detecting refractive index variations in a sample is disclosed. The apparatus includes a multi frequency laser source configured to generate a mixed laser beam having at least two optical frequencies. A sinusoidal function generator is configured to modulate the optical frequencies to generate a chirp-modulated mixed laser beam. The chirp-modulated mixed laser beam being configured to pass through the sample. A detector is configured to detect the chirp-modulated mixed beam. A signal processer is configured to process the detected chirp-modulated mixed beam to measure refractive index variations in the sample.

Abstract: A photonic integrated circuit comprises a first waveguide with a first mode of light propagating therein and a second waveguide with a second mode of light propagating therein. The first and second modes of light have different effective indices of refraction. A taper formed in the second waveguide facilitates communication of light between waveguides. Each of the first and second waveguides operate to perform at least one of the generating light, detecting light, and transporting light.

Abstract: N-alkanoylglutamic acid derivatives in which the alkanoyl group is substituted with the 2-amino-4-hydroxy-5,6,7,8-tetrahydropyrido[2,3-d]pyrimidine-6-yl or 2,4-diamino-5,6,7,8-tetrahydropyrido[2,3-d]pyrimidin-6-yl group are antineoplastic agents. Typical embodiments are N-[6-(2-amino-4-hydroxy-5,6,7,8-tetrahydropyrido[2,3-d]pyrimidin-6-yl)hexa noyl]-L-glutamic acid and N-[4-{-(2-amino-4-hydroxy-5,6,7,8-tetrahydropyrido[2,3-d]pyrimidin-6-yl ethyl}cyclohex-1-yl]-L-glutamic acid.