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215results about How to "Convenient investigation" patented technology

High speed train rescue conversion device

A high speed train rescue conversion device comprises an electronic control unit, an electric pneumatic conversion valve, a relay valve, a discharge valve and an emergency electromagnetic valve. The electronic control unit collects train pipe pressure and outputs current signals used for braking, and the electric pneumatic conversion valve converts the received current signals into corresponding precontrol pressure signals and transmits the precontrol pressure signals to a braking pressure input port of the relay valve. Flow amplification of the precontrol pressure signals is carried out by the relay valve, and then the precontrol pressure signals are respectively input into an upper cavity and a lower cavity of the discharge valve. The lower cavity of the discharge valve is connected with a train pipe after blocked and cocked, and the upper cavity of the discharge valve is connected with the emergency electromagnetic valve. A supply pressure input port of the electric pneumatic conversion valve and a supply pressure input port of the relay valve are respectively connected with a pressure supply output port of a main air reservoir (MR). Air valves and the electronic control unit are combined into a whole, synchronization pressure reduction braking of a train with the high speed train rescue conversion device and other trains is achieved, and purposes that device integration and braking sensitivity are promoted, horizontal impulses of the train are reduced, bogie equipment is protected, and braking effect of the train is promoted are achieved.
Owner:NANJING CRRC PUZHEN HAITAI BRAKE EQUIP CO LTD

Dual forward scattering method for modeling multipath propagation

Analysis of electromagnetic (or acoustic) multipath propagation inventively focuses upon the transmitter-to-target propagation (transmitted propagation reaching target via both direct pathway and forward scattered pathway) and the target-to-receiver propagation (re-transmitted propagation reaching receiver via both direct pathway and forward scattered pathway). Transmitter-to-target propagation is calculated using conventional multipath modeling technique. The target's overall scattered field is calculated using the calculated transmitter-to-target propagation in conjunction with qualitative electromagnetic/acoustic target information. Target-to-receiver propagation is calculated using conventional multipath modeling technique and/or the reciprocity principle as applied to the calculated transmitter-to-target propagation. Jointly disclosed (practicable therewith or thereapart) is inventive confinement of the assessment of multipath propagation to a “surface interactive region” (“SIR”), intermediate the target and transmitter and/or the target and receiver. The down range time of the propagation, translatable to range distance, is related to error associated with such restriction. A SIR scope is selected commensurately with acceptable error.
Owner:THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY

GIS (Geographic Information System)-based heat supply network leak detection system and method thereof

The invention discloses a GIS (Geographic Information System)-based heat supply network leak detection system and a method thereof. The GIS-based heat supply network leak detection system comprises a data collection and monitoring subsystem, a real-time service subsystem, a database and a GIS platform management subsystem. The data collection and monitoring subsystem is used for collecting and transmitting leak monitoring data of fixed monitoring points of a heat supply network. The real-time service subsystem is used for communicating with the data collection and monitoring subsystem to obtain the leak monitoring data and store the leak monitoring data in the database, and analyzing the leak monitoring data. The database is used for storing the leak monitoring data, digital map data and heat supply network pipeline data. The GIS platform management subsystem is used for communicating with the database and displaying the leak monitoring data and the influence area of an accident of an accident monitoring point on a heat supply network digital map according to second leak alarming information. Compared with the prior art, the GIS-based heat supply network leak detection system can timely and accurately find the heat supply network leak accidents, a GIS platform can accurately position the leak accidents and display the accidents on the map, and the leak accident information can be timely supplied to corresponding staff members.
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