Abstract: A system for detecting substances, the system including a dual-energy radiography (DER) system including a gamma-ray radiation source, including a beam accelerator and a target to which the accelerator sends a beam thereby producing gamma rays, and a plurality of gamma ray detectors positioned to detect gamma rays that pass from the gamma-ray radiation source through an object to be inspected, wherein the DER system is adapted to indicate a presence of a high-Z substance, by detecting a difference in a transmission attenuation characteristic of the high-Z substance as opposed to low-Z and medium-Z substances and differentiating among high-Z substances according to their density, as determined from a plurality of radiographic views.

Abstract: A log-periodic antenna having a layer of dielectric media interposed between a microstrip log-periodic portion and a slot log-periodic portion is described. Also described are antenna embodiments having a curvilinear, electrically conductive feed line and a substantially co-extensive curvilinear slot transmission line and additional embodiments including an array of two or more log-periodic antennas.

Abstract: The invention provides a method and apparatus for achieving timing synchronization during signal acquisition and for achieving frequency synchronization in a digital communication receiver after signal acquisition. The invention operates by performing multiple correlations of a received signal, each correlation performed over an symbol interval and correlating the received signal in the symbol interval with a sinusoid of an expected frequency. The correlations are combined to determine a peak and energy, and if the peak to energy ratio is above a threshold, the symbol timing and frequency offset is estimated.

Abstract: A transmitter (200) has a compression detector for sensing the level of compression (110) in a signal that is being transmitted. The transmitter also has a radio frequency power amplifier (RFPA) (414) that is supplied by a supply modulator (426). The supply modulator provides a dynamic supply bias to the RFPA to maintain a desired amount of compression in the signal being transmitted. The supply modulator is responsive to a modulation signal (207) created by substantially following the envelope (214) of the signal to be transmitted (212). However, various signal and operational conditions can occur which cause the compression level to deviate (506) from the desired level. To maintain the desired compression level, the compression detector provides an output that is used to adjust the modulation signal from following the envelope of the signal to be transmitted in an unadjusted manner.

Abstract: The present invention relates to a knockdown construction utility cart. In an embodiment, the utility cart includes a top shelf, a middle shelf and a bottom shelf. The top and middle shelves include a base, three sidewalls, and a side skirt. The bottom shelf includes a base and four side skirts. The cart also includes a plurality of wheels attached to the bottom shelf, a plurality of posts attached to each shelf. The posts are perpendicular to the bases of the shelves. The shelves include L-shaped attachment mechanisms configured to secure the shelves and the posts in a perpendicular arrangement so that the shelves are parallel to each other. The cart also includes a handle coupled to two of the posts.

Abstract: A mobile computer security cabinet configured to prevent theft of computer equipment and includes a monitor enclosure that contains a computer monitor, allows viewing the monitor without accessing it, and prevents unauthorized entry; a central processing unit (“CPU”) enclosure that contains CPU, printer and other computer related equipment and prevents unauthorized entry; a keyboard enclosure coupled to the monitor and CPU enclosure and prevents unauthorized entry; and a wheel assembly coupled to the CPU enclosure. The keyboard enclosure further includes a drawer, which slides out of the keyboard enclosure and exposes an interior portion of the keyboard enclosure without providing access to the monitor and CPU enclosures.

Abstract: In the present power control technique, a power control circuit (404) that is operably coupled to a receiver circuit (412) assesses (514, 522) a tclip adjust value based on a power cutback value from the receiver circuit. The tclip adjust value is forwarded to a peak to average ratio control circuit (402) operably coupled to the power control circuit (404), and using the tclip adjust value, an adjust peak power signal is accordingly assessed (612).

Abstract: A wire shelf includes at least four post supporting members each disposed at a respective corner of the wire shelf. A pair of end members is disposed at opposing ends of the wire shelf. Each of the end members is comprised of a truss having an upper wire and a lower wire. Each of the end members is joined at one end to one of the post receiving members and is joined at another end to another of the post receiving members. A pair of side members is disposed at opposite sides of the wire shelf. Each of the side members is joined at one end to one of the post receiving members that is joined to one of the end members and is joined at another end to another of the post receiving members that is joined to another of the end members. A plurality of wires is disposed atop and is joined to a top surface of the side members. At least one center support member is disposed between the side members and in parallel therewith. The center support member is comprised of a truss having an upper wire and a lower wire.

Abstract: A radio frequency module (500) that uses reconfigurable and reprogrammable hardware to generate and condition RF signals that have one of several selectable modulation formats. A modulation controller (316) selects a selected modulation format from a plurality of modulation formats and a signal generator (408) that is capable of generating a signal modulated with any modulation format within the plurality of modulation formats generates a signal (520) modulated with the selected modulation. A signal filter (406) filters the signal according to one algorithm of a plurality of algorithms that is selected based upon the selected modulation format to produce a filtered signal (522). A signal linearizer (404) adaptively compensates the filtered signal (522) for distortions introduced by processing of the signal.

Abstract: A method (200) of frequency drift prediction for use by a positioning receiver (106) can include the steps of determining (202) a moving average of a frequency error, determining (206) a moving average of a frequency drift rate in a communication device, determining (212) a frequency drift rate uncertainty, and providing (214) the moving average of frequency error and frequency drift rate, and the frequency drift rate uncertainty to the positioning receiver. A point-to-point slope from the running average of the instantaneous frequency error and a running average of the point-to-point slope for a predetermined time period can be determined (208 & 210). The frequency drift uncertainty or window is determined using information determined from the moving average of the frequency drift rate. The positioning receiver can be a global positioning receiver.

Abstract: A method (200) of frequency drift prediction for use by a positioning receiver (106) can include the steps of determining (202) a moving average of a frequency error, determining (206) a moving average of a frequency drift rate in a communication device, determining (212) a frequency drift rate uncertainty, and providing (214) the moving average of frequency error and frequency drift rate, and the frequency drift rate uncertainty to the positioning receiver. A point-to-point slope from the running average of the instantaneous frequency error and a running average of the point-to-point slope for a predetermined time period can be determined (208 & 210). The frequency drift uncertainty or window is determined using information determined from the moving average of the frequency drift rate. The positioning receiver can be a global positioning receiver.

Abstract: The container for disposal of cigarette waste includes a base, a hollow stem having an outer wall that contains an interior cavity of the hollow stem. The stem further includes a top and a bottom, where the stem is coupled to the base at the bottom. The container also includes a removable cap which is detachably coupled to the top of the stem. It further includes a disposal bucket attached to the cap. Once the cap is coupled to the top of the stem, the disposal bucket is suspended in the interior cavity of the stem. At least one hole is made through the outer wall of the stem near the top. Once the disposal bucket is placed in the interior cavity of the stem, the hole is located between disposal bucket and the cap.