Abstract: A head slider includes a front rail and a pair of rear side rails. Side rails extend from the outflow end of the front rail toward the rear side rails, respectively. Air guiding surfaces are defined within the outward surfaces of the side rails. The air guiding surfaces get far from the corresponding side edges, respectively, at a position closer to the outflow end of the slider body. A so-called yaw angle is defined in the head slider. Change in the yaw angle leads to change in the incident angle of airflow. Airflow runs across the side edge of the slider body. The airflow runs along the outward surface of the side rail. The airflow is received on the rear side rail. A predetermined positive pressure is generated at the rear side rail. The balance of the positive pressure enables a reduction in the roll angle.

Abstract: A recording disk drive includes a head actuator member supporting a flying head slider at its tip end. The head actuator member takes off form a ramp member outside the recording disk when the rotation of the recording disk has entered a steady condition. The flying head slider thus receives airflow generated along the moving surface of the recording disk. The airflow serves to generate a negative pressure on the flying head slider when the head actuator member is disengaged from the ramp member. The flying head slider is forced to get closer to the surface of the recording disk. In this case, the airflow flows into a depression surrounded by an air bearing surface. The airflow bounces back at the bottom of the depression. Such airflow serves to increase the lift on the flying head slider. The flying head slider is prevented from collision against the recording disk.

Abstract: An antenna control unit that is applicable to a cellular communications system that employs sectorized cells, each cell consisting of a plurality of sectors, adjusts the beam width of a directional antenna that is provided to each sector such that downlink transmission power levels of the sectors are made equal.

Abstract: A high frequency power amplifying apparatus is provided with an amplifying section with a plurality of amplifying stages connected in cascade. A power control signal is supplied to the amplifying section through a control terminal so as to control the output of the high frequency power amplifying apparatus. Each of the amplifying stages has a gain smaller than that of a preceding stage. Gain control signals generated from the power control signal are supplied to the respective amplifying stages. Dividing resistors are connected in series with one another between the control terminal and a reference potential so as to divide the voltage of the power control signal to thereby generate a plurality of different gain control signals. Different ones of the gain control signals are supplied to the respective amplifying stages, an absolute value of a voltage of the gain control signal applied to each stage is smaller than that applied to an earlier preceding stage.

Abstract: A high frequency power amplifying apparatus is provided with an amplifying section with a plurality of amplifying stages connected in cascade. A power control signal is supplied to the amplifying section through a control terminal so as to control the output of the high frequency power amplifying apparatus. Each of the amplifying stages has a gain smaller than that of a preceding stage. Gain control signals generated from the power control signal are supplied to the respective amplifying stages. Dividing resistors are connected in series with one another between the control terminal and a reference potential so as to divide the voltage of the power control signal to thereby generate a plurality of different gain control signals. Different ones of the gain control signals are supplied to the respective amplifying stages, an absolute value of a voltage of the gain control signal applied to each stage is smaller than that applied to an earlier preceding stage.

Abstract: A high frequency power amplifying apparatus is provided with an amplifying section with a plurality of amplifying stages connected in cascade. A power control signal is supplied to the amplifying section through a control terminal so as to control the output of the high frequency power amplifying apparatus. Each of the amplifying stages has a gain smaller than that of a preceding stage. Gain control signals generated from the power control signal are supplied to the respective amplifying stages. Dividing resistors are connected in series with one another between the control terminal and a reference potential so as to divide the voltage of the power control signal to thereby generate a plurality of different gain control signals. Different ones of the gain control signals are supplied to the respective amplifying stages, an absolute value of a voltage of the gain control signal applied to each stage is larger than that applied to an earlier preceding stage.

Abstract: Glyoxylic acid or a salt of glyoxylic, an ammonium salt of an organic or inorganic acid and a phenol compound of the formula: ##STR1## wherein n is an integer of one to three, are condensed together to prepare hydroxyphenylglycine compounds of the formula: ##STR2## wherein n is the same as defined above. The hydroxyphenylglycine compounds thus obtained are useful as intermediates in the synthesis of penicillins and cephalosporins.