An electrochemical sensor system based on wireless sensor network is designed which can detecting the CO in fire monitoring,and the nodes can communicate with the others through a shortest path routing according to mu...
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An electrochemical sensor system based on wireless sensor network is designed which can detecting the CO in fire monitoring,and the nodes can communicate with the others through a shortest path routing according to multi-hop transmission based on CSMA/CA principle;described the principle of the system and demarcated the detectors;analyze the experiment data,the result shows that the sensor has a good linearity,and its sensitivity reached to lppm,the maximum distance of single hop transmission is 100m.
In this paper,a unidirectional high-frequency link inverter based on Fuzzy PID Controller Scheme is designed. The inverter is composed of two stages:DC to DC and DC to AC *** order to improve the performance controlle...
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In this paper,a unidirectional high-frequency link inverter based on Fuzzy PID Controller Scheme is designed. The inverter is composed of two stages:DC to DC and DC to AC *** order to improve the performance controller in the control system,a fuzzy PID control is *** working principle of the whole system is provided,and the design process of fuzzy controller is also given in *** simulation results show that the fuzzy controller can not only stabilize the output sine waveforms,but also realize rapid transient response under parameter variations and load *** can be used to control the control system of high-frequency link inverters effectively.
This paper discusses the LO feedthrough's impact on receiver's specifications and the necessary of zero frequency reject firstly,then presents a method of zero reject based on amplitude and phase adjustment co...
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This paper discusses the LO feedthrough's impact on receiver's specifications and the necessary of zero frequency reject firstly,then presents a method of zero reject based on amplitude and phase adjustment controlled by main processor. The sampling signal's amplitude is changed by voltage variable attenuator and the phase is adjusted by varying the inverse voltage applied to the voltage variable capacitor diodes which connect to Lange Coupler's couple *** method is proved to have characteristics such as high reject capability,small volume,reliable etc.
The design of the electronic order dishes system with embedded system as the terminal,ARM7 as the master chip,data transmission based on micro-power short-range wireless communication technology,and LCD display interf...
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The design of the electronic order dishes system with embedded system as the terminal,ARM7 as the master chip,data transmission based on micro-power short-range wireless communication technology,and LCD display interface. The system realizes all functions of electronic order dishes such as founding and order dishes,information storage,modification, deletion and display order time *** graphical user interface of order dishes terminal is designed for operators through the keys to order,and the customer order dishes information will be sent to the background *** embedded system is easy to use,low cost,low power consumption and high reliability,can promote the use in catering services.
This paper presented the factors affecting the wavelength of laser diode.A circuit for temperature controlling for laser wavelength stabilization in CPT atomic clock was *** test showed that the wavelength could be fr...
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This paper presented the factors affecting the wavelength of laser diode.A circuit for temperature controlling for laser wavelength stabilization in CPT atomic clock was *** test showed that the wavelength could be freely changed and stabilized by the *** wavelength control accuracy is 0.0012nm.
With purpose of overcoming the defect of nonuniformity of heating in traditional microwave oven,a new type of variable-frequency microwave oven was designed in this *** describing its basic structure and mechanism, HF...
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With purpose of overcoming the defect of nonuniformity of heating in traditional microwave oven,a new type of variable-frequency microwave oven was designed in this *** describing its basic structure and mechanism, HFSS software was adopted to model and simulate this oven. The simulation results show that this new type of variable-frequency microwave oven gains greatly improved uniformity of heating comparing to traditional microwave oven. Our design can be realized by recast based on traditional microwave ovens,so its development cost can be low and thus it is possessed of good application value and market value
In order to improve the collimation of laser diode bar which works in the laser detection and the laser ranging, this paper provides a method to designs the primary collimation which uses vertical double half-cylindri...
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In order to improve the collimation of laser diode bar which works in the laser detection and the laser ranging, this paper provides a method to designs the primary collimation which uses vertical double half-cylindrical lens combination,it is an impartment part of the lens combination for collimation. Using ray-tracing method and Matlab to analyze the transmission of the beam,and then analyze the optical transmission by sequential tracing and non-sequential tracing by Zemax-EE,at last we get the laser spot which is close to rectangle,and the divergence angle is about 14mrad.
At present,all the ground-based navigationaids use the double system to improve the safety capability of the navigation and the reliability of the *** reliability of the single equipment is the classical target to ass...
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At present,all the ground-based navigationaids use the double system to improve the safety capability of the navigation and the reliability of the *** reliability of the single equipment is the classical target to assess and estimate the reliability of double system navigation equipment. But it can not assess the real reliability of the total *** analyze and conclude reliability model of designing double system to drive and build the mathematics model on the double system navigation equipment reliability is *** the navigation of domestic and overseas use the double system,the paper utilized the Complete Probability Formula and Poisson distribution to *** we deduce a whole system reliability model about the double system *** the reliability(R) and the MTBF of the system is given in this paper.
In this paper,the on-line monitoring platform of the terminal state of mould case circuit breaker(MCCB) based on LonWorks power line communication technology is discussed. Data acquisition module is designed through u...
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In this paper,the on-line monitoring platform of the terminal state of mould case circuit breaker(MCCB) based on LonWorks power line communication technology is discussed. Data acquisition module is designed through utilizing PL3120 intelligent power line *** state parameters of MCCB terminals can be uploaded to monitoring computer by using the mode of power line *** results show that the state parameters of MCCB terminals are recorded *** this means,on-line inspection of terminal state and failure diagnosis are achieved.
A method of embedding watermark in a characteristic vector to find in the original image is proposed in the ***,the original image is decomposed using DWT. Secondly,the DCT is used to low frequency coefficient,and a c...
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A method of embedding watermark in a characteristic vector to find in the original image is proposed in the ***,the original image is decomposed using DWT. Secondly,the DCT is used to low frequency coefficient,and a characteristic vector which is invariable with the geometrical transforms is acquired in the coefficient matrix of the *** watermark information was embedded in the characteristic vector,and the secret key of containing watermark information is *** the watermark is to detect,the characteristic vector is obtained from the attacked image with the same method,and then the watermark information is detected in the secret key of containing *** experimental results proved that this algorithm can resist the geometrical attacks such as distortion,rotation,translation and scaling,and has the strong robustness,transparency and security.
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