Advanced Materials Research Vols. 562-564

Abstract: This paper focuses on the sparsity and artifacts of the dynamic reaction of gaseous formaldehyde detector, which results in a certain distortion in the fitting process. A new method based on linear regressive model with unmeasured data prediction using linear neural network is proposed . Linear neural network method has simple inferring rules and strong predictive capability for linear relationships. This predictive data can be obtained using the sequence near the end as the input signal of trained linear neural network model. Based on the extended data, a linear regressive model is introduced to fit the response curve of gaseous formaldehyde detector. Experimental results have shown that the presented method is valid and effective .

Abstract: In this paper, an energy-measurement-IC-based digital power meter is developed with demand control function for residential electrical energy management through wireless Zigbee and Internet. Several developed micro-controller-based modules are incorporated into this residential energy management system for demand control, such as infrared-controller module, infrared-learning module, and infrared-controlled switch module. This system can send the measured electricity utilization data through Wireless Sensor Network (WSN) and Internet to the remote server. The user can also control at any time the loads (appliances) at home through any computer or smart phone that is connected to the Internet.

Abstract: Due to the complex design and high costs of production, solar thermal systems have fallen behind in the world of alternative energy systems. Different mechanisms are applied to increase the efficiency of the solar collectors and to reduce the cost. Solar tracking system is the most appropriate technology to increase the efficiency of solar collectors as well as solar power plants by tracking the sun timely. In order to maximize the efficiency of collectors, one needs to keep the reflecting surface of parabolic trough collectors perpendicular to the sun rays. For this purpose microcontroller based real time sun tracker is designed which is controlled by an intelligent algorithm using shadow technique. The aim of the research project is to test the solar-to-thermal energy efficiency by tracking parabolic trough collector (PTC). The energy efficiency is determined by measuring the temperature rise of working fluid as it flows through the receiver of the collector when it is properly focused. The design tracker is also simulated to check its accuracy. The main purpose to design this embedded system is to increase the efficiency and reliability of solar plants by reducing size, complexity and cost of product.

Abstract: The heat exchanger is widely used in energy engineering, chemical engineering etc. And with development of the MEMS (Micro Electro Mechanical Systems), many researchers are interested in the micro heat exchanger. In this paper, the micro plastic heat exchangers are manufactured by modified PPS. A heat exchanger with polypropylene (PP) is also made for comparison. Simulation and experiment are carried out to determine the thermal performance of the micro plastic heat exchangers. The experimental results are compared with that of simulation. The results show the performance of the micro plastic heat exchanger is very close to that of metal heat exchanger with the same dimension.

Abstract: The paper designs a multiple-data acquisition system based on the AT89S52. The system consists of two-way series A/D converter ADC0832, SCM AT89S52, extended 62256 RAM and LED display. It also describes the functional block diagram of system design, hardware interface schematics for each block and the software flow chart. By the acquisition, processing and display to the two road voltage signals, the results show that the system can realize the real-time data acquisition, processing and display for the multiple data, which has better versatility and can be widely used in the field of industrial automatic control.

Abstract: Ultrasonic transducer is produced by piezoelectric materials, and it can detect some characteristics of a target media by transmitting a certain frequency of ultrasonic signals and receiving the signal containing information of the media. The special properties of piezoelectric ceramic determine that the ultrasonic transducer will have a widely used. This paper mainly studies the characteristics of the piezoelectric ceramic, the parameters and equivalent circuit of the transducer performance, and the liquid concentration detection with the transducer.

Abstract: The gas sensor is significant for coalmine production safety. In order to carry out optimal gas sensor placement in heading face, the software named Fluent was used to simulate underground gas distribution. Geometry model was established and divided by grids. Gas distribution in heading face was simulated using RNG k-ε model by Fluent according to conversation equation in turbulent state, turbulent kinetic energy equation and turbulent dissipation rate equation. The results show that gas is likely to accumulate in the upper corner, when wind passes through the corner after washing heading face, wind velocity is unstable, the performance of sensor placed in inner side of turning is different from that placed in outer side of turning. Distance of gas sensor to heading face should be no more than 10m which accords with the mine safety regulations well. The result shows that gas can be monitored effectively by applying this method which has an important value and instructive significance.

Abstract: This paper introduces a campus safety monitoring system based on wireless mobile communication network. Backbone network of the system is an ad-hoc network based on Opportunity Driven Multiple Access (ODMA) multi-hop relaying protocol, which has the characteristics of wireless relaying, quickly and flexible network formation, dynamic topology etc. The system has the functions of image real-time transmission, the patrol car mobile camera shooting and video signal mobile transmission, and static and mobile wireless Internet access etc.

Abstract: This paper introduces an online thickness monitoring technology of blast furnace stack. It describes the composition of monitoring technology, the basic principles and requirements of thickness measurement, and the features and functions of monitoring technology. Finally, the application of this monitoring technology in blast furnace stack thickness is analyzed and summed up.

Abstract: High speed stackers are the critical equipments for automated storage/retrieval systems to improve efficiency and throughput. And the positioning technique is the key to speed regulating. The low cost and easy installation indoor positioning of wireless sensor network is applied in this situation. A novel quadrilateral projection algorithm taken advantage of the linear moving of stackers is proposed to reduce the complexity of the algorithm and improve ranging accuracy of positioning.