Abstract: An electronic device provides, to a display, data to present a user interface that includes a plurality of user interface objects, and a current focus on a first user interface object. While the display is presenting the user interface, the electronic device receives an input that corresponds to a movement of a contact across on a touch-sensitive surface. The electronic device, in response to receiving the input and in accordance with a determination that a first axis is a dominant axis, moves the current focus along the first axis by a first amount and along the second axis by a second amount. The amount of movement of the current focus along the second axis is reduced to a first non-zero amount by a scaling factor that is based on one or more inputs received prior to receiving the input.

Abstract: While the present invention may be used in a variety of applications, is is particulary well suited for use in loading elongate loads, such as hollow concrete utility poles, onto railroad cars. The system of the present invention protects the load, as well as the car, from damage when the car is coupled at either end to a locomotive or another car. The system includes a floating support beam which extends across the car and onto which the load is attached. The beam is held to the car by a plurality of cables or springs so that it can move if a shock is applied to either end of the car. The load may also be secured to the car using conventional strapping techniques, so long as any such technique permits limited longitudinal movement of the load on the car.

Abstract: The thermal stability of propellant compositions containing triaminoguanidine nitrate and an energetic plasticizer-binder system is vastly improved by including in the composition an amount of resorcinol sufficient to provide with the plasticizer a solution which is essentially saturated or super-saturated at 25.degree. C.

Abstract: A communication system for providing both analog information pulses and digital information pulses in a single frame of a pulse train, including circuitry for sequentially multiplexing and modulating a first given number "m" of analog information input channels to provide "m" analog information pulses in each frame of the pulse train to convey information respectively representative of the analog information in the analog information input channels; and circuitry for modulating a second given number "n" of binary information input channels to provide a variable number of digital information pulses and for multiplexing the variable number of digital information pulses in each frame of the pulse train sequentially to the analog information pulses, wherein the variable number of digital information pulses is within a range of 2.sup.n pulses to convey information respectively representative of the binary information in the "n" binary information input channels.

Abstract: An improved comparator circuit is employed to respond to the charge on a capacitor which represents the integrated value of an input current. When the charge exceeds the comparator trip point, an output is generated. The output is delayed in time from the onset of the input current by an amount that is almost exactly linearly proportional to the current magnitude. The improvement comprises a circuit that senses the onset of comparator conduction and supplies the current necessary to operate the comparator. At very low input current values a condition can be reached where the current drawn by the comparator input equals or exceeds the applied current. For this condition an ordinary comparator will never trip. The improved circuit prevents this and, since the current added is only to compensate, the timing function is not seriously perturbed.

Abstract: A differential amplifier has one input connected to a reference potential and a photo diode connected in series with a level shift to the other input. A negative feedback loop is also coupled into other input. This stabilizes the amplifier and, if the level shift is made equal to the reference potential, biases the photo diode to zero, thereby reducing leakage current. A second feedback loop is used to adaptively bias the tail current in the differential amplifier.

Abstract: A sonar system utilizing a common LC tuned circuit for both the transmitter portion and the receiver portion of the electronic system so that both receiver and transmitter are tuned to the same frequency. The transducer is isolated from the LC tuned circuit so that the impedance characteristics of the transducer will not operate to change the main frequency of the tuned circuit. Thus interchangeable transducers may be utilized with the receiver-transmitter circuitry. The transmitter power pulses are generated by a novel Class C pulse circuit providing short time width, high intensity power pulses to the transducer.