摘要:
An acoustic system for applying vibratory energy including a horn connected to an ultrasonic energy source. The horn defines an overall length and wavelength, and at least a leading section thereof is comprised of a ceramic material. The leading section has a length of at least ⅛ the horn wavelength. In one preferred embodiment, an entirety of the horn is a ceramic material, and is mounted to a separate component, such as a waveguide, via an interference fit. Regardless, by utilizing a ceramic material for at least a significant portion of the horn, the ultrasonic system of the present invention facilitates long-term operation in extreme environments such as high temperature and/or corrosive fluid mediums. The present invention is useful for fabrication of metal matrix composite wires.
摘要:
An acoustic system for applying vibratory energy including a horn connected to an ultrasonic energy source. The horn defines an overall length and wavelength, and at least a leading section thereof is comprised of a ceramic material. The leading section has a length of at least ⅛ the horn wavelength. In one preferred embodiment, an entirety of the horn is a ceramic material, and is mounted to a separate component, such as a waveguide, via an interference fit. Regardless, by utilizing a ceramic material for at least a significant portion of the horn, the ultrasonic system of the present invention facilitates long-term operation in extreme environments such as high temperature and/or corrosive fluid mediums. The present invention is useful for fabrication of metal matrix composite wires.
摘要:
A method of sorting mail according to the invention includes the steps of receiving a plurality of first mail pieces of unknown origin in a first apparatus for bulk processing of the mail pieces, processing the mail pieces in the first apparatus by one of testing the mail pieces to determine if a potentially dangerous microorganism is present, sterilizing the mail pieces to destroy microorganisms on mail pieces, or both, and then if no contamination is detected or if sterilization is carried out, combining first the mail pieces at a later stage of postal processing with second mail pieces from senders identified as having a lesser risk of contamination than the first mail pieces of unknown origin. The invention further provides mail contaminant detection and sterilization systems suitable for use in such a method.
摘要:
Nanometer to micrometer sized particles containing platinum and having selected morphologies are prepared by a sonochemical process. A compound of platinum is dissolved, suspended, or diluted in a suitable liquid medium at a predetermined concentration and the liquid is maintained at a predetermined temperature from sub-ambient temperatures to above ambient temperatures. A reducing gas is bubbled through the liquid as it is subjected to cavitation at a controlled power to affect the reductive decomposition of the platinum compound. The morphology of the precipitated platinum particles can be varied widely by varying the described concentration, temperature and power parameters.
摘要:
A method and system for logically disconnecting a host computer from a network and for reconnecting it in the same manner, such that physical rewiring is not required. The method and system provides security during a virus attack by rapidly isolating an affected host, thereby preventing attack propagation. Logical connections are managed using a network filter to suspend all traffic from a given network host. The network filtering may be implemented as a network protocol or as an administrative tool from a network server.
摘要:
A system for detection of doubles in a stream of flat items such as mail pieces being conveyed on a conveyor includes an electronic imaging camera positioned to receive an image of a side face of conveyed items over a first portion of its field of view, a reflector positioned to reflect an edge view of the items to the imaging camera, which edge view is received by the imaging camera over a second portion of its field of view, and a computer that receives image data from the camera. Program logic used by the computer determines whether the image shows one item, or more than one item.
摘要:
A speaker mounting assembly adjustably supports a speaker from a mounting surface. The speaker mounting assembly comprises a speaker enclosure, a support arm, and a mounting bracket mounted to a mounting surface. The speaker enclosure defines a window opening, and the window opening is constructed to receive entry of an insert portion of the support arm. A latch supported by the enclosure and extending from the window opening can be used to engage with the insert portion to automatically retain the support arm when the insert portion is inserted into the window opening. A post extends within the enclosure window and the insert portion engages the post so as to enable pivoting of the speaker enclosure about the support arm. A set screw extends through a channel of the support arm toward the mounting bracket and based on position of the screw, permits pivoting of the support arm about the mounting bracket.
摘要:
A headset is disclosed having a headband configuration that distributes the compression forces on the user's head to provide firm placement without causing discomfort to the user. The headband is preferably integrally formed with a soft overmold molded along a portion of its interface with the user's head. The headband terminates in first and second ends. Either or both ends may terminate in a flared temple pad for further distribution of compression forces or may terminate in an earphone. A boom is pivotally connected to either a temple pad or an earphone and is optionally conformable for positioning towards the wearer's mouth. The boom terminates in a microphone.
摘要:
The present invention relates to a method of producing a sintered body comprising one or more hard constituents and a binder phase based on cobalt, nickel and/or iron by powder metallurgical methods milling, pressing and sintering of powders. At least part of the binderphase powder consists of non-agglomerated particles of spheroidal morphology having dimensions of 0.1 to 20 .mu.m.