Advanced Materials Research Vols. 424-425

Abstract: A novel gas stove is developed by upgrading the general home use gas stove, it can absorb heat loss when heating food, through analysis of its performance and optimized, the result shows that it can not only solve the problem of heat leakage, but also reduce the unnecessary temperature rise of kitchen. This will improve the gas efficiency when boil water to cook, meanwhile it can save energy indirectly and achieve good economic returns. It can improve the utilization of its natural gas, on the other hand, it can reduce heat loss and environment pollution, environmental and economical benefits.

Abstract: In this paper, the scattering measuring principle of turbidity is introduced firstly. The new type of turbidity sensor probe designed in this paper overcomes the deficiencies of existing technologies, which has higher sensitivity, strong anti-interference and can detect the turbidity accurately and continuously. The system designed with the core of MCU C8051F020 is presented. Then the design of turbidity sensor probe, data acquisition, processing and non-linear compensation are introduced in detail. Besides, in order to eliminate the impact of temperature on the turbidity measurement and improve the measurement accuracy, temperature measurement circuit has been designed. Test results have shown that the designed on-line turbidity-meter has some advantages: low price, high precision, easy operation etc. It can be widely applied in the fields of waterworks, industrial production, aquaculture, environmental protection and so on

Abstract: Under mild thermal condition, mercury releasing characteristics and its morphological features transformation of fly ash sample, which is obtained from the exit of air pre-heater of one power plant in eastern China, has been studied in the paper. The experiment shows that under mild thermal condition, the temperature range of fly ash mercury releasing is about 200 °C ~ 800 °C. It reaches the first peak at about 300 °C and it reaches the second peak at about 600°C. Moreover, most sample elemental mercury is Hg0. The fly ash sample in which mercury emissions and unburned carbon content have no obvious relationship.

Abstract: In the APF system, PWM control plays an important role in improvement of power quality and harmonic compensation. Given the current PWM control method assumes DC voltage as constant. So the APF operating loss and energy exchange among system components cause the DC voltage the certain fluctuation which deteriorates the effect of harmonic compensation. This paper presents an improved PWM method which uses the designed fuzzy PID controller to control the deviation between the calculated voltage and the set one, adjust the size of the duty cycle to modify PWM waves, and make the output stability in the new set-point. Finally, it shows the simulation results in this paper. This improved PWM approach makes the AV output to avoid the influence from the DC fluctuation, and obtains the ideal harmonic compensation effect

Abstract: Through chemical composition analysis of corroded steel sample and enamel steel sample, through SEM-EDS and XRD analysis of corroded steel sample, the corrosion characteristics was studied, the possible influence to the heat exchange and flow rate were also analyzed. Through polarization curves experiment, a comparative analysis of the corrosion resistance between old GGH materials and newly installed enamel steel is made. The results have shown that the corrosion resistance with the heat transfer surface in GGH will decrease with the temperature increasing, but the enamel steel’s corrosion resistance and stability is strikingly better than the old materials.

Abstract: In view of the current status and shortcomings of existing meter reading systems, in this paper, we proposed an automatic gas meter reading system based on the advantages of gas meter directly reading technology, WSN technology and GPRS technology, introduced the whole scheme and the design of hardware and software in detail. The system is consist of three level network. The first level network and the second level network use the different frequency during communication. It decreases the interface of each other during the translation of the data, and increase the lifetime of the smart gas meter. The system has the advantages of easy construct, flexible layout, lower power consumption

Abstract: For Brillouin Optical Time Domain Reflectometry (BOTDR) based distributed sensing technique, limited by 1m-order spatial resolution, it is difficult to monitor or test localized deformation, and loop installation of optical fiber sensors is a good countermeasure, In this paper, firstly, the measurement behavior and performance of loop installed optical fiber sensors is investigated experimentally, and the accuracy of BOTDR based distributed fiber optic sensors (DFOS) is evaluated. Furthermore, an experimental investigations on a steel specimen is carried out. Based on the investigations, steel structure damage identification method with no requirement for a structural Numerical Model is proposed.

Abstract: This paper analyzed the reasons why different of calorific value between coal as received and coal as fired generate. The differences of calorific value between coal as received and coal as fired of seven power generation groups were compared. Evaluation cycle, evaluation indicators and evaluation methods of the calorific value difference were proposed. It was pointed out that the new evaluation criteria would contribute to energy saving and consumption reduction of power enterprises

Abstract: At present, a large-scale construction of concrete structure sprout up all over china, it is imperative to inspect the concrete carefully, efficiently and accurately with portable monitoring tools as speedy bulk construction required. This paper sets out by analyzing LTD-2100 radar diagnosis waveform in concrete structure safety, and then compares the interpretation of waveform with sampling concrete examination. Eventually, the consistent result reflects the non-destructive detection method of this radar has high value, for its high resolution examination, accurate positioning defects with high efficiency and easily operates which could benefit to engineers from real-time monitoring of concrete structure quality.

Abstract: In an online defects inspection system for cord fabric based on machine vision, Image segmentation for cord fabric defects has been the heat and difficult problem. An adaptive segmentation algorithm using threshold surface is presented in this paper. This method inspects defects through detecting the change of image gray levels caused by the difference in optic character between glass and defects. The experiment results indicate that the proposed method has low computation cost, fast speed and good segmentation performance. It is in accord with the requirements of online inspection system such as reliability, real-time, and veracity