摘要:
A carbon nanotube thermophone is provided. The thermophone includes high temperature rated shells as protective walls as the top and bottom housing of the thermophone with carbon nanotube sheets affixed between the shells. The shells act as acoustic windows that match the surrounding frequency and acoustic radiation medium. A high temperature rated sealant gasket is used to enclose the shells of the thermophone where gas holes are inserted for interior heavy gas filling. The acoustic resonant frequency is defined by the dimensions of the housing of the thermophone and the sound speed of the filled heavy gas. Each carbon nanotube sheet has an electrode at both ends. Multiple carbon nanotube sheets can electrically tune the impedance to match a driving amplifier impedance load.
摘要:
A method for preparing hydrorefining catalyst comprises the following steps: (1) mixing an aqueous ammonia solution with a polyamine complexing agent to form a mixed solvent; (2) adding a cobalt salt to the mixed solvent, dissolving the cobalt salt, and then adding a molybdenum salt and optional salts of other active components, and dissolving them to prepare an impregnating solution; and (3) impregnating a support with the impregnating solution, followed by aging, drying, and activating the impregnated support to form a hydrorefining catalyst. The hydrorefining catalyst prepared by this method has good activity, selectivity and stability in use.
摘要:
In accordance with the present invention, there is provided a novel class of heterocyclic compounds. Compounds of the invention contain a substituted or unsubstituted six membered heterocyclic ring that includes at least two nitrogen atoms. The ring additionally includes four carbon atoms. The heterocyclic ring has at least one substituent located at a ring position adjacent to a ring nitrogen atom. This mandatory substituent of the ring includes a moiety (B), linked to the heterocyclic ring via a carbon-carbon triple bond. The mandatory substituent is positioned adjacent to the ring nitrogen atom. Invention compounds are capable of a wide variety of uses. For example heterocyclic compounds can act to modulate physiological processes by functioning as agonists and antagonists of receptors in the nervous system. Invention compounds may also act as insecticides, and as fungicides. Pharmaceutical compositions containing invention compounds also have wide utility.
摘要:
A method may involve: maintaining protocol status information for a network protocol, where the protocol status information includes protocol information generated by a protocol server and network traffic information indicative of how messages are conveyed from the protocol client to a network, and updating the protocol status information in response to intercepting a protocol message being conveyed between a protocol client and a protocol server. For example, the network protocol can be DHCP (Dynamic Host Configuration Protocol) and the protocol status information can be updated to include an IP (Internet Protocol) address assigned to the protocol client by the protocol server in the protocol message. Such a method may inhibit the misuse of one or more network protocols and/or attacks on protocol servers.
摘要:
The present invention presents a method for use with an acoustic sensor array comprised of a number of pressure-vector sensors capable of sensing the acoustic scalar field and acoustic vector field of an acoustic wave. The method is a signal processing technique that utilizes nonlinear processing of pressure-vector sensor signals in the acoustic sensor array. The method involves the steps of receiving the sensor output values, processing the output values using a non-linear algorithm to create a mathematical series of values, transforming the series, applying weighting to the series and performing a summation of the values in the series to calculate the array directivity response. The array directivity response can then be further processed where the array is part of a sonar system.
摘要:
Compounds having Formula 7 wherein the symbols have the meaning defined in the specification are inhibitors of the cytochrome P450RAI (retinoic acid inducible) enzyme, and are used for treating diseases responsive to treatment by retinoids.
摘要:
A carbon nanotube thermophone is provided which includes a urethane frame having mounting holes at corners of the frame. Screw holes in the frame are provided for a cable holder. A square shaped carbon nanotube material chip is positioned within the urethane frame. The carbon nanotube material chip can comprise multiple carbon nanotube sheets to electrically tune the impedance to match a driving amplifier impedance load. Wooden spacers assist in positioning the carbon nanotube material chip. A first end of a cable is soldered to the carbon nanotube material chip at electrodes of the material chip. A high temperature rated silicon sealant is used for attachment points on the thermophone.
摘要:
A passive carbon nanotube transducer is provided. The passive carbon nanotube transducer includes shells as protective walls for the top and bottom housing of the transducer with carbon nanotube sheets affixed between the shells. The shells act as acoustic windows that match the surrounding acoustic medium. A gasket encloses the shells and carbon nanotube sheets of the transducer. Each carbon nanotube sheet has an electrode at both ends. Multiple carbon nanotube sheets are capable of sensing sound induced environment temperature deviations and converting electric voltage or current for passive acoustic detection.
摘要:
Protocol status information is used to perform traffic filtering by dropping messages that are not consistent with the protocol status information. In one embodiment, a method involves comparing message information and protocol status information. The message information is associated with a first message. The protocol status information is obtained in response to one or more second messages, which are conveyed according to a protocol used to assign network addresses to clients. The method also involves determining whether to discard the first message, based on an outcome of the comparison of the message information and the protocol status information. For example, it can be determined that the first message should be discarded, if the message information does not match the protocol status information.
摘要:
A method for using a deployable, small package acoustic transmitter device is taught, which serves as a standard acoustic source for on-vessel, in-mission field calibration purposes. The method involves deploying an acoustic transmitter device underwater to provide a predefined acoustic energy source for sonar array detection as well as periodic time-coded acoustic signal pulses for tracking and calibration of passive ranging.