Abstract: Pyridopyrimidine nucleotide derivatives expressed by formula (I), which are fluorescent and capable of forming base pairing with guanine or adenine, and oligo- or polynucleotide which have at least one of these derivatives in their molecules or at their molecular terminals: ##STR1## wherein X.sub.1 and X.sub.1 respectively represent ##STR2## (in which n indicates an integer of 0, 1, 2, or 3; however, in no case X.sub.1 and Y.sub.1 both indicate n=O); Z.sub.1 indicates a hydrogen atom or ##STR3## (in which n indicates an integer of 1, 2, or 3); W.sub.1 indicates a hydrogen atom or a hydroxyl group. As for R.sub.1 and R.sub.2, in case where R.sub.1 is an amino group or halogen, R.sub.2 indicates a single bond between the carbon atom at the 7-position and the nitrogen atom at the 8-position, and in case where R.sub.2 is a hydrogen atom or an lower alkyl group, R.sub.1 indicates a carbonyl bond ##STR4## formed with the carbon atom at the 7-position.

Abstract: A floor polisher with a dust collecting device has a buffing pad which is rotated at a high speed by a motor, a circular cover member and a skirt for covering an upper surface of the buffing pad, and a dust collecting device for exerting a collecting function thereof on an internal space surrounded by the cover member and the skirt. The floor polisher is characterized in that the cover member and the skirt are partly extended on a tangential line to form a guide chamber for a dust-containing air current, that the guide chamber is provided at an inlet port thereof with a guide wall opposite inner wall surfaces of the cover member and the skirt extended on the tangential line and an inclined plate which is inclined toward a floor, and that the guide chamber is provided at the outer end thereof with an outlet port communicating with the dust collecting device.

Abstract: According to this invention, a device for detecting the speed of transference of a moving body, having a construction such that the device comprises a magnetizing element for forming a magnetic pole on a surface of a moving body made of a magnetic material and disposed in the vicinity of the moving body, a magnetic field detecting circuit provided adjacent to the moving body, for linking therewith the magnetic field of the magnetic pole formed by the magnetizing element and for outputting an electrical voltage in accordance with a variation of the magnetic field caused by the transference of the moving body, and an output signal processing circuit for processing a signal output by the magnetic field detecting circuit and for determining the speed of transference of the moving body can be obtained, and by utilizing the device mentioned above, an effect whereby a signal corresponding to the displacement speed of a moving body is continuously obtained and therefore, a moving body need not be precisely fabricated

Abstract: An acceleration sensor including a magnetic fluid, a permanent magnet emplaced movably in the magnetic fluid, a nonmagnetic case, in which case the magnetic fluid and the permanent magnet are sealed and from which case air is substantially excluded, the shape of internal receptacle of the case dominating the shape of the magnetic fluid, whereby the path of the magnetic flux generated by the permanent magnet is restricted and the permanent magnet in the magnetic fluid is given an automatic positioning function, a unit for detecting the position of the permanent magnet, and a processing circuit for processing signals from the detection unit.

Abstract: An anti-skid braking system for a vehicle, having (a) hydraulic brakes for wheels of the vehicle, (b) actuators provided for respective brake groups each including at least one of the brakes, for controlling a braking pressure or pressures of the brake or brakes of the corresponding groups, (c) speed sensors, at least one of which is provided corresponding to each actuator, for detecting speeds of the wheels, and (d) to controller operable for: normally presuming that an actual speed of the vehicle is represented by a highest one of the detected wheel speeds; after a deceleration value of the highest speed has exceeded a preset upper limit, fixing the deceleration value of the vehicle at the preset upper limit, and presuming the actual vehicle speed based on the upper limit; and calculating a slip amount of each wheel based on a difference between the presumed vehicle speed and the detected wheel speed, to control each actuator so as to prevent the wheel from skidding.

Abstract: A braking system including a hydraulically operated brake for braking a drive wheel of a motor vehicle, a slip detector for detecting an amount of slip of the drive wheel, and a pressure-regulating controller for increasing or decreasing a fluid pressure to be applied to the brake, in response to each output signal of the slip detector, whose value indicated a pressure-increase or pressure-decrease condition which requires an increase or decrease in the fluid pressure, respectively, such that the amount of slip of the drive wheel is maintained within an optimum range.

Abstract: A method of automatically controlling a braking system for an automotive vehicle, by changing a plurality of control parameters in at least two steps, depending upon a determined one of three or more ranges of a variable in which a detected value of the variable falls. At least one of the control parameters is changed in two steps corresponding to two adjacent ranges of the variable, while at least one of the other control parameter or parameters is kept unchanged for the two adjacent ranges of the variable. The variable may be a deceleration rate of the vehicle, or other variables which are changed with a coefficient of friction between a vehicle wheel and the road surface.

Abstract: A braking system for an automotive vehicle, having a first brake system and a second brake system. The first brake system includes a master cylinder responsive to an operation of an operator-controller brake operating member, for generating a fluid pressure which corresponds to an operation value of the brake operating member, and a first brake actuated by the fluid pressure generated by the master cylinder. The first brake is adapted to produce a braking effect which is smaller than a desired or optimum braking effect corresponding to the operation value of the brake operating member. The second brake system has a second brake and is controlled by a controller such that the second brake produces a braking effect which is equal to a difference between an actual braking effect applied to the vehicle, and the desired braking effect.

Abstract: An anti-skid braking system for an automotive vehicle, including a first brake system and a second brake system. The first brake system has a master cylinder for generating a fluid pressure corresponding to an operation value of a brake operating member, a first brake for a wheel of the vehicle equipped with a brake cylinder actuated by the pressure of the master cylinder, and a first solenoid valve device between the master and brake cylinders and operable between a first and a second position for communication of the brake cylinder with the master cylinder and a reservoir, respectively. The braking system includes a second brake system which has a second brake cooperating with the first brake to apply a brake to the wheel; a speed sensor for detecting a speed of the wheel; and an anti-skid controller for estimating a slip ratio of the wheel based on the detected speed.

Abstract: An anti-squeal braking system for an automotive vehicle, including a first brake having a brake rotor, a friction member disposed opposite to the brake rotor, and a hydraulically operated actuator for forcing the friction member against the brake rotor, and further including a second brake cooperating with the first brake to apply a brake to the vehicle. The first and second brakes are controlled by an anti-squeal controller such that the first brake is operated without a braking squeal, while the second brake is operated so as to provide a braking effect equal to a difference between an actual braking effect applied to the vehicle by the first brake, and a desired braking effect that should be applied to the vehicle. The desired braking effect is predetermined corresponding to an operation value of an operator-controlled brake operating member sensed by a detector device.

Abstract: Reactive azo dyestuffs which, in the form of free acid, are represented by the following formula: ##STR1## (wherein R is hydrogen or methyl) are characterized by exhibiting the following properties: high fixation efficiency, excellent wash-off, high build-up and excellent wet fastness. Such dyestuffs give dyeings excellent in light fastness, chlorine fastness and color yield.

Abstract: An apparatus for selectively controlling yarn carriers for movement along with a carriage in a flat knitting machine. A trick location detector is provided on the carriage for detecting varying positions, expressed in terms of the number of tricks from one or the other tricked end of a needle bed, of the carriage on the needle bed during its run thereon. Coupling plungers in a plunger box on the carriage are controlled by solenoids in such a way that the plungers each is actuated to slide to its operative position relative to one of the yarn carriers for engagement therewith so that the yarn carrier so engaged by the plunger is carried along by the carriage over the predetermined distance.

Abstract: A stereophonic magnetic tape recording system having a pair of magnetic recording heads each provided with its own signal processing circuit including amplifiers, an equalizer, etc. Shared by both channels, a bias oscillator feeds a bias current, having a frequency higher than the spectrum of the information signals to be recorded, to both record heads. For continuously adapting the recording bias and equalization to the high frequency portions of the information signals, each channel is further provided with a variable impedance circuit connected in parallel with one of the record heads, and a control circuit for varying the impedance of the variable impedance circuit as dictated by the high frequency portion of the corresponding information signal.

Abstract: A racking device for an automatic flat knitting machine in which a data of the knit structure and other data are stored in memory members in respect to each course and the knitting operation is carried out based on outputs of said stored data. The racking device includes a means for correcting a signal of an instruction for driving the racking motor.

Abstract: Apparatus for remotely operating self-advancing supports or the like at a long-walled pit face of a coal mine comprises a receiver attached to every group of the supports which are arranged in front of and along the long-walled pit face, each of the receivers having a specific frequency, hydraulic cylinders attached to the support for causing the support to be operated, electromagnetic valves connected to the receiver to control the hydraulic cylinders, and a portable operating means including keys for specifying the groups of the supports, key switches for specifying the supports to be operated, and a transmitting circuit having operating switches, wherein operating signals are applied from the operating means via the radio system to the receivers.

Abstract: System and equipment for operating self-advancing supports comprising electromagnetic valves being provided in each of the self-advancing supports which support the roof of a long-walled pit face in a coal mine and rendering operative the hydraulic cylinders for causing the roof plates of the supports to be lowered and lifted and for causing the supports to move toward the pit face, and operating devices being connected to the electromagnetic valves through a cable wherein the electromagnetic valves can be opened and closed through the operating devices from a desired position remote from the supports so as to operate the supports.

Abstract: Equipment for remotely operating by transmitted signals self-advancing supports which are used with a shearer at a long-walled pit face in a coal mine comprises electromagnetic valves, one of which is connected to a hydraulic cylinder for lowering the roof plate of a self-advancing support and moving the support toward the pit face and the other of which is connected to another hydraulic cylinder for lifting the roof plate of the support, a signal converter and a receiver are connected through a cable to the electromagnetic valves including those of the other self-advancing supports in such a manner that each of the electromagnetic valves is specified through the matrix circuit system; and a portable transmitter is provided for transmitting operation signals to the receiver through the radio system.