Abstract: A surgical instrument (12) includes a tool for screwing in a surgical implant or for cutting a thread in human bone tissue with thread tap. Also included is a unit (2) for supplying power and controlling the speed of an electric motor included in the tool, for example a d.c. motor (1). Detection members (7, 8) transmit signals (i1), dependent on the torque of the tool, to display members which comprise a computer unit (9) with screen (10). Displayed on the screen is a curve which shows the torque in relation to the torsional angle position. A curve or curves displayed in this way form(s) the basis for assessing the quality of the implant or of the bone tissue.

Abstract: This invention concerns a procedure for the elimination of interferences, such as pulses and linear chirps, in a radar unit of the FMCW type. According to the procedure, the useable signal in the form of a beat signal, is subjected to time-frequency division of the type STFT for division of the signal into narrow-band frequency bands. Interference is detected and eliminated in each frequency band, after which the time signal freed from interference and its Discrete Fourier Transform, DFT, are calculated from the time-frequency division in narrow-band frequency bands.

Abstract: The power level for uplink data transmission in a wireless communications network utilizing an on-demand multiple access method with a fair queuing service discipline (ODMAFQ) for efficient utilization of the limited bandwidth available in the wireless network is established curing the initial access request message. The power level in a wireless network having a base station and several remote hosts is established by first transmitting a short connection request message to the base station from one of the remote hosts at an initial power level that is set relative to the nominal open loop power level. If the first remote host's transmission is unsuccessful, the power level is incremented by a power increment amount that may be predetermined, and the steps of transmitting and incrementing are repeated until the transmission from remote host to base station is successful.

Abstract: A dual bus microcomputer system including a cache subsystem improves performance under certain circumstances by allowing programmable control over the LOCK function. More particularly, additional logic is coupled between the LOCK output of the CPU and the LOCK input of the cache controller. A control bit from an I/O port is a second input to the additional logic. With the control bit in one state, the logic allows the LOCK input to follow the LOCK output. In the other state of the control bit, the LOCK input is disabled regardless of the state of the LOCK output.

Abstract: Apparatus for insuring a vehicle operator's attentiveness at potentially dangerous locations along a path of travel. A signalling device is provided in advance of a potentially dangerous location, in the direction of travel of the vehicle. A vehicle carried signal responsive device responds to the signalling device when within the effective zone of the signalling device. The vehicle includes warning apparatus, for example, an alarm and a buzzer. The vehicle also includes an operator actuatable push button and a speed sensing apparatus. A control device responds to the push button and to the vehicle carried signal responsive device to operate either the buzzer or the alarm. If the operator evidences his alertness to the potentially dangerous location by actuating the push button prior to reaching the signalling device (within some constraint), the control apparatus merely sounds the buzzer when the signalling device is detected and resets itself.

Abstract: A radar with 3-D capability comprises a conventional 2-D radar with a height finding attachment. More particularly, a height finding antenna is mounted on the back surface of the conventional 2-D antenna reflector and points in a direction 180.degree. offset in azimuth from the direction of the 2-D antenna. An r-f transmitter with a linear frequency modulated output is coupled to the height finding antenna and controlled by a transmit control based on target range and azimuth data provided by the 2-D radar. The height finding pulse compression receiver also responds to this target information as well as the height finding return radar signal and extracts height information which is then made available to a suitable display.

Abstract: Apparatus is provided for modifying a conventional target locating system in which targets respond to an interrogation signal by transmitting a reply, and the target location is deduced from the azimuth from which a reply is received and the delay between the interrogation signal and the reply. The improvement includes a controllable attenuator coupling the receiving antenna to the target locating system which is controlled to selectively discriminate against selected range cells at selected azimuths. In a preferred embodiment, digital circuitry is relied upon to control the attenuator, and the identication of the range cells to be discriminated against is stored in a digital memory.

Abstract: Equalization apparatus for a communication system transmitting through a time or frequency spread medium. The message to be transmitted is partitioned and transmitted in burst or frame by frame form. Each frame comprises the message (unknown at the receiver) followed by a test signal known at the receiver. Time gaps are provided between the message and test signals to avoid overlapping of the received message and test signals due to time-spreading. The received mutilated signals are processed in the frequency domain to obtain a reconstituted version of the transmitted message in the frequency domain. This is re-transformed into the time domain so that the reconstituted message available at the receiver is a close replica of the message which was originally available only at the transmitter.

Abstract: A novel bulbous bow for bulk carriers comprises a conical bulb with a faired nose, with the axis of the cone substantially parallel to the longitudinal axis of the ship. In a preferred embodiment the cone is a right circular cone and the faired nose is substantially a hemisphere. More particularly, the included angle of the cone is in the range of five to twenty degrees. Although the cone could be faired into the hull, preferably it is not. The longitudinal centerline of the bulb is located between 45 and 60 percent of the design draft below the design waterline. The preferred extension of the bulb, beyond the forward perpendicular, is proportional to the square of design speed with the proportionality factor in the range of 0.015 to 0.04 and preferably 0.035. The cross-sectional area of the bulb at the forward perpendicular may be in the range from 10 to 20 percent of the amidships cross-sectional area.