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    • 2. 发明专利
    • WATER QUALITY MONITORING SYSTEM
    • JP2001083139A
    • 2001-03-30
    • JP25838899
    • 1999-09-13
    • HITACHI LTD
    • KIMURA TOSHIOFUKUNAGA MASAOYAMADA KATSUTOSHI
    • G01N33/18
    • PROBLEM TO BE SOLVED: To obtain a water quality monitoring system which can monitor the quality of water more closely to consumers and can be easily set up near the end of the piping of water works. SOLUTION: The water quality monitor of a water quality monitoring system is provided with analyzing sections 15-17 which execute a plurality of measurement items by sampling the water in a pipeline, a storing section 48 storing the data indicating control operations to be performed in the analyzing sections 15-17, a control section 18 which controls measurement based on the data stored in the storing section 48, and a communicating section which transmits and receives signals to the outside of the water quality monitor by radio. A communication data converting means 503 which converts the data used on a public line 51 and the data used for the radio communication with the water quality monitor to each other is connected to the public line 51. A management center collectively manages the quality of the water in the pipeline by mutually communicating with a plurality of water quality monitors through the data converting means.
    • 3. 发明专利
    • OSCILLATION CIRCUIT
    • JPH04130802A
    • 1992-05-01
    • JP25025890
    • 1990-09-21
    • HITACHI LTDHITACHI VIDEO ENG
    • KIMURA TOSHIO
    • H03B5/12
    • PURPOSE:To correct an oscillation frequency variable range and a sensitivity by means of another system control voltage by constituting a variable frequency oscillation circuit which uses a variable capacitance element for tuning in such a way that plural variable capacitance elements are serially connected and plural independent control voltages are added so as to control an oscillation frequency. CONSTITUTION:An original tuning voltage is impressed on a main variable capacitance diode 1 for tuning form an impression point 4. A correction voltage is impressed on a variable capacitance diode 3 for correcting the oscillation frequency variable range and a tuning voltage sensitivity from an impression point 6, 7 is a coil for tuning. When the variable capacitance diode 1 and 3 are connected serially, the oscillation frequency variable range and the sensitivity for the tuning voltage added to the variable capacitance diode 1 from the impression point 4 is corrected by the correction voltage added to the variable capacitance diode 3 from the impression point 6 in accordance with a situation.
    • 4. 发明专利
    • CASCODE AMPLIFIER
    • JPH03240306A
    • 1991-10-25
    • JP3604790
    • 1990-02-19
    • HITACHI LTDHITACHI VIDEO ENG
    • KIMURA TOSHIOHORIUCHI NAOYUKI
    • H03F1/22
    • PURPOSE:To improve the disturbance characteristic by connecting a connecting point among amplifier elements to a constant level point via a resistor, adjusting the resistance of the resistor and setting the operating point of each amplifier element independently so as to control the amplification factor and the distortion component. CONSTITUTION:The cascode amplifier is formed by cascade connection of an emitter connection 1st stage transistor(TR) 1 and a base connection post-stage TR 2. A resistor 6 is connected between ground and a connecting point 5 of a collector of the 1st stage TR 1 and an emitter of the post-stage TR 2 and the operating point of the post-stage TR 2 is set independently without being controlled by the 1st-stage TR 1 by adjusting the resistance of the resistor 6. Thus, the transfer function of the amplifier circuit is optimized and the amplifier circuit with excellent disturbing characteristic is realized.
    • 5. 发明专利
    • RADIO COMMUNICATION EQUIPMENT
    • JPS62274842A
    • 1987-11-28
    • JP11800086
    • 1986-05-22
    • HITACHI LTDHITACHI SERVICE ENG
    • KIMURA TOSHIOSAGAWA MITSUNORI
    • H04J3/06
    • PURPOSE:To attain mutual simultaneous talking between a master station and plural slave stations without hindrance such as crosstalk in each one channel of transmission/ reception radio channel by using the same frequency for the master station and the plural slave stations and controlling the frequency sequentially at a high speed with a synchronizing signal from the master station. CONSTITUTION:An optional station is used as the master station A and others are used as slave stations B, the transmission frequency of the master station A and the reception frequency of the plural slave stations B are assigned to the same radio channel, the transmission frequency of the slave stations B and the reception frequency of the master station are assigned to one and same radio channel having the different frequency from the above frequency, a synchronizing signal is superimposed onto the sending signal from the master station A at all times, the sending period of each station is set in advance so as not to be overlapped with that of other station in the slave stations B, the sending period of its own station is controlled automatically by using the synchronizing signal and the stations are operated sequentially according to the set sending period. Thus, the simultaneous mutual talking between the master station and the plural slave stations B is attained without crosstalk by using the radio channel for each transmission/reception.
    • 7. 发明专利
    • Data input device
    • 数据输入设备
    • JPS599513A
    • 1984-01-18
    • JP11674982
    • 1982-07-07
    • Hitachi LtdHitachi Service Eng Co Ltd
    • HACHITSUKA TAKASHIKIMURA TOSHIO
    • G01D3/024G01D3/02G06F3/05G06G7/04G06G7/26
    • G01D3/02
    • PURPOSE:To make it possible to perform the measurement within the short accuracy ranges of sensors even though a measuring range is expanded, by providing a structure wherein the output levels of the sensors are added, manipulating the amplification ratio of an amplifier even though sensors are increased, thereby supplying outputs to an operator at the same level. CONSTITUTION:The range of an output to an operator 2 is 0-4.8V. The range of the outputs of a transmitting devices T1-T3 is 0.4-2V. The measuring range of sensors S1-S3 are divided into three parts so that relationship S3
    • 目的:为了能够在传感器的短距离范围内进行测量,即使测量范围扩大,通过提供传感器的输出电平相加的结构,即使传感器是放大器也可以操纵放大器的放大率 增加,从而向相同级别的操作员提供输出。 构成:输出到操作员2的范围为0-4.8V。 发送装置T1-T3的输出的范围为0.4〜V2V。 传感器S1-S3的测量范围被分成三部分,从而获得关系S3 <= S2 <= S1。 当测量范围在S3内时,输出通过发送设备T3发送到转换器1,T1和T2的输出变为零电平。 当测量范围在S2内时,从发送装置T3输出最大电平2V,从发送装置T2输出与电平对应的值,T1的输出为零电平。 当测量范围在S1内时,发送设备T3和T2的输出处于最大电平,发送设备T1的输出对应于该电平。 输出电平的转换相应地由转换器1执行,并且0-4.8V范围内的输出被提供给操作者2。
    • 8. 发明专利
    • ESTIMATING DEVICE FOR WATER LEVEL IN REACTOR
    • JPS5693015A
    • 1981-07-28
    • JP16935479
    • 1979-12-27
    • HITACHI LTDHITACHI SERVICE ENG
    • KIMURA TOSHIOONODERA KATSUSHIGEKIYOKAWA KAZUHIRO
    • G01F23/00G21C17/02G21C17/035
    • PURPOSE:To estimate changes in water level, by a method wherein an operational circuit, which finds a difference between an incoming cooling water amount to and an outgoing cooling water (steam) from a nuclear reactor, converts a ratio of the difference to a set constant into changes in water level per unit hour, and multiplies the changes by a set hour, is installed. CONSTITUTION:For example, a steam release valve for pressureized steam in a nuclear reactor opens, and a water level changes resulting from flowing-in of cooling water from a separated cooling water pump. A signal SG1 from a cooling water meter sends an incoming amount signal to a substractor 5 through a signal processor 1, and an operational amplifier 4. In the meantime, a signal S7 from the release valve sends an outgoing (liquid) amount signal, corresponding to an exhaust steam amount, through a processor 2 and the operational amplifier 4. A difference signal between the incoming and the outgoing amount is outputted to a divider 6, and a change amount in a water level per unit hour is sent to a multiplier 8. The change amount is multiplied by a set time sent from an elapsing time setter 10, and then, an estimated value for changes in the water level is outputted to an indicator 9.
    • 9. 发明专利
    • SUPPLYING APPARATUS OF FILTER PAPER
    • JPS55116416A
    • 1980-09-08
    • JP2347379
    • 1979-03-02
    • TOKYO ELECTRIC POWER COHITACHI LTD
    • ISHIZUKA AKIRAKIMURA TOSHIOOOGUSHI AKIRA
    • B01D29/09B01D35/12
    • PURPOSE:To supply surely filter papers and spacers by a method wherein the control for suction and supply of filter papers is carried out by providing a means for distinguishing between the filter paper and the spacer. CONSTITUTION:Four large and small holes are provided alternately on the circumference of a turntable 1 which is rotated by a driving means 8. Filter papers and spacers are placed alternately on a disk 11 equipped with a spring 12 within a paper supply container 2. The top of the filter paper or the spacer is pressed against a roller 10 by the spring 12. When the turntable 1 is rotated and a large hole is positioned above the container 2, a catching means 4 descends. A valve V5 is closed and a valve V3 is opened by a detector 9. When the detector 9 detects the spacer, the valve V5 is closed and a valve V4 is opened. By this operation, the filter paper or the spacer is attracted by the catching means 4. When the table 1 is rotated in a 90 deg. arc, the filter paper or the spacer drops into a smaller hole of the table 1. In case of the filter paper, filtration is carried out by the rotation in a subsequent 90 deg. arc. By further mext 90 deg. rotation, the filter paper is introduced into a container 3 by a pushing means 6.