摘要:
With a view to providing a cable of an ultrasonic probe, as well as an ultrasonic probe using the cable, which can improve the operability in ultrasonic diagnosis without impairing the reliability of the ultrasonic probe, the thickness of a sheath portion (a length position thereof) which constitutes a cable at a position near a mounted position of an ultrasonic probe head is selected so as to be larger than the thickness of the sheath portion (a length position thereof) which constitutes the cable at a position spaced away from the mounted position of the ultrasonic probe head.
摘要:
Respective contact terminals in respective arc-suppressing spaces of respective breakers are opened at a voltage zero point of any phase of three phases, simultaneously among the three phases. If current breaking is carried out for the three phases at the same time, when the breakers of the three phases are opened, the residual magnetic levels of the respective phases of a transformer can be controlled so that the residual magnetic flux level of the phase opened at the voltage zero point is maximum (for example, −2 K or +2 K) and the residual magnetic flux level of the other two phases are opposite in polarity to the residual magnetic flux level of the phase concerned and equal to substantially the same residual magnetic flux (for example, +K and +K or −K and −K) which is equal to about one half of the residual magnetic flux level of the phase concerned. Accordingly, by throwing the phase broken at the voltage zero point at a first time, the difference in residual magnetic flux between the second throwing phase and the third throwing phase just after the first phase is thrown can be substantially nullified.
摘要:
An antenna element includes a substrate formed of a dielectric material having a specific inductive capacity exhibiting frequency distributing properties, a grounding conductor formed on one surface of the substrate, a plurality of radiating conductors formed on the other surface of the substrate, and a plurality of feeder lines provided for passing through the substrate for connecting the grounding conductor to the radiating conductors. This antenna element is able to achieve equivalent gain for plural frequencies.
摘要:
An antenna device and a portable wireless communication apparatus lower a local average specific absorption rate (SAR) in correspondence to at least two or more kinds of radio communication systems using different radio communication frequencies even when any radio communication frequency is used. Input impedance at open ends of conductive planar plates are brought close to infinity at first and second radio communication frequencies and restrict emission of electromagnetic waves by restricting a high-frequency current to be supplied to the above described conductive plates and a shield case, thereby securely lowering the local average SAR in correspondence to at least two or more kinds of radio communication systems using different radio communication frequencies even when any radio communication frequency is used.
摘要:
A liquid separation membrane module includes a semipermeable membrane receiving a pressure of a feed liquid, and a channel material arranged so as to support the back side of the semipermeable membrane. The channel material is a tricot knitted fabric knitted by a tricot knitting machine with two reeds and has a ground stitch portion and a convex portion. The tricot knitted fabric includes a thermoplastic synthetic filament yarn with a core/sheath type conjugated fiber having a high melting point polymer as a core component and a low melting point polymer as a sheath component. Thermoplastic synthetic filament yarns for forming the ground stitch portion and the convex portion have a substantially same fineness, and the yarns in the tricot knitted fabric are bonded with one another by melt adhesion of the low melting point component to rigidity the entire knitted fabric.
摘要:
A synchronous switching apparatus for detecting a source voltage of each phase to close each phase at an electrical phase angle predetermined for each phase, including switching devices 1a-1c provided one for each phase for opening and closing an impedance load, switching devices 2a-2c for closing and opening the switching devices 1a-1c for each phase, measuring transformers 5a-5c for measuring source voltages of the respective phases and phase-to-phase voltages, and phase control devices 42 each for issuing a command for energizing the impedance load at an electrical phase angle in a range predetermined for each phase, when detecting a zero point of a source voltage of each phase or a zero point of each phase-to-phase voltage.
摘要:
An antenna device includes a flat ground conductor; a first flat radiation conductor disposed against the flat ground conductor interposing a first dielectric layer; a first short-circuit conductor connecting an end of the first flat radiation conductor and the flat ground conductor; a second flat radiation conductor disposed partly against an opposite side of the first flat radiation conductor with its other side facing the ground conductor interposing a second dielectric layer; a second short-circuit conductor connecting an end of the second flat radiation conductor and the flat ground conductor; and a supply point disposed on the first flat radiation conductor. With this structure, the first flat radiation conductor and the second flat radiation conductor are disposed partly against each other, which enables more size reduction than that of conventional antennas operating at the same resonant frequency.
摘要:
A phase control switching system for controlling opening and closing timings of a power switching device to suppress the occurrence of an exciting rush current or a make-and-break surge voltage which is severe to system equipment such as a transformer, a reactor and a capacitor bank, or for controlling an arcing time of a circuit breaker to put the circuit breaker into operation for the arcing time leading to no-re-ignition or for the optimal breaking time. In the phase control switching system, a current measuring section or a current gradient measuring section is provided to measure a current value or a current gradient value of a current to be broken or introduced, and a reference phase detecting section estimates a current zero point of a current waveform on the basis of the measurements. Subsequently, a control section, upon receipt of an opening/closing command, an opening phase control operation using an arbitrary time point after the current waveform estimation as a reference.
摘要:
Corresponding to a connector for an external antenna arranged at a bottom end portion of a housing of a portable telephone, a RF transmitter-receiver circuit and a feeding spring are provided in a lower part of a circuit substrate, electric power is supplied to a bottom end portion of a rod antenna longer than .lambda./4, and a supporting fitting arranged at a top end portion of the housing, for contacting the intermediate portion of the rod antenna is connected to a ground of the circuit substrate through a ground spring, whereby a portion of the rod antenna above the circuit substrate stably operates as a .lambda./4 mono-pole antenna.
摘要:
A mono-pole antenna is composed of a first element and a second element. An insulator spacer is disposed between the first element and the second element so as to capacitively couple them. In the state that the antenna is retracted, the helical antenna operates. In the state that the antenna is extended, the mono-pole antenna composed of the first element and the second element operates. Since the mono-pole antenna is composed of the first element and the second element that are capacitively coupled, even if the electrical length of the helical antenna is different from the electrical length of the mono-pole antenna, the impedances can be properly matched with a common matching circuit.