Advanced Materials Research Vols. 301-303

Abstract: The development of Internet of Things has led to a sharp rise in demand for sensors. Users require that sensors can collect information from the Internet of Things in a timely and accurate way. In response to the present situation that there are only a few varieties of gas components-based materials in the application of Internet of Things. According to the new viewpoint that energy gap Eg> 2ev materials are likely to be used to develop thin film gas sensors, we have succeeded in preparing quality thin film gas sensors Fe₂O₃/2%CeO₂ and TiO₂/2%CeO₂ by using the method of powder sputtering. Based on the concept of metal oxide Eg chemical bonds, we have successfully prepared ZnSnO₃ and other composite gas sensor-based materials. All these are significant in guiding the development of new gas sensor-based materials for Internet of Things sensors. This paper focuses on what we have done and how we have down in new gas sensors based materials research and practice of Internet of Things

Abstract: Wireless sensor network is a new area of ​​research in the computer science and technology. In response to the demand for a variety of network sensors, this paper describes thin film gas sensors and wireless sensor development, puts forword the manu facturing technology of producing thin film gas sensor with reactive powder doped sputtering method, discusses properties related to gas sensing.and power consumption. And introduces how thin film gas sensor chip and its related GPRS wireless sensor in order to lay the foundation for their application in Internet of Things.

Abstract: This paper presents an approach that estimates the thickness of the porous sediments on the bottom of a circular pipe by comparing the measured propagation modes’ frequencies to that calculated by finite element method (FEM). It is validated by comparing the calculated results to the theoretical results for the circular pipes with rigid boundary condition and to the experimental results with sediments laid on the bottom of the pipe. The comparison results show that the disagreements between measured thickness and the calculated thickness are less 3 percent. This method can be used to monitoring or measuring the depth of the sediments on the bottom of a pipe in confined situations.

Abstract: Based on the analysis of formation and variation characteristics of oxide layers in ELID grinding, a new measurement principle and method for oxide layer measurement in ELID grinding was proposed. The thickness of the oxide layer was obtained based on measurement both outside surface and inner surface of the oxide layer by laser sensor and eddy current sensor. Calculation methods for measurement of the oxide layer in different ELID grinding periods were presented. In order to verify the correctness of the measurement principle and measurement method, evaluation experiments were down. Results show that the precision of the measurement is sufficient to be applied in ELID grinding.

Abstract: In continuous casting, it is very important to predict and detect the internal cracks of billet in time for ensuring continuous production, improving product quality and reducing production costs. In this paper, Clustering analysis method is adopted to do feature extraction and classification for on-site data, by which ladder parameter tables of processing parameters and defect grades of internal cracks are got. Fault tree analysis (FTA) method is adopted to analyze the effects of processing parameters on internal cracks. The solidification speed of billet is calculated by solidification heat-transfer model. Quality prediction model of internal cracks in continuous casting billet is established by quality prediction function, based on clustering analysis model of on-site data, FTA model and solidification heat-transfer model. Some samples of Steel Grade 1008 are selected for testing the quality prediction model. The percentage of accuracy for the quality prediction is 80 percent, which provides the foundation for industry application.

Abstract: An improved sobel algorithm is proposed for the iris location algorithm,solving the problem of large amount of computation in standard iris location algorithm as well as location impreciseness.According to the geometric character of human eyes for iris location,select purposely the special region of sub-image as the target region, then apply the edge detection,projection for rough location,then use the improved sobel algorithm to fine position.This improved sobel algorithm not only use the advantages of the original algorithm,but also make sobel algorithms only to detect circle.Improve the accuracy of iris location and make more accurate positioning.Experimental results showed that the algorithm with less computational can be accurately positioned inside and outside the boundary of the iris.

Abstract: The survey shows that the bulk density of lunar soil increases with the depth. The compaction of lunar soil also differs in the depth. The lunar soil mechanical condition plays an important and non-negligible roll on the mobility of the rover. It is important to make research on the change of the mechanical parameters at different lunar soil conditions, and it is also important to research the trafficability of rover on different lunar surface condition. The presented paper simulates the lunar soil with different depth by means of three kinds of lunar soil simulant on different compact condition. Based on the direct shear apparatus, it was researched that the cohesion, internal friction angle, bull density of lunar soil simulant on different compaction conditions, including loose, normal, and compressed. The measurement results show that the bulk density and cohesion of the lunar soil simulant increase with the compact conditions in general. The bulk density changes within a narrow range from1.1 g/cm³ to 1.4 g/cm³. The cohesion increases, and changes significantly, which varies from 0 kPa to 0.5 kPa. The internal friction angle changes without regularity within a range from 30 deg to 40 deg. The measurement results can be used to explain the different trafficability of wheels after repeatedly passing the same lunar surface. Also it will be of significant to the evaluation of the rover mobility at different lunar soil condition.

Abstract: The wide application on fields of designing and NC programming based on 3D model of part not only provide the supporting for applying 3D based process planning, but also raise the challenge for the design capability of 3D based process planning. The 3D based process is not just replacing 3D process drawing with 3D model, it is concerned with schemas of designing, managing information applying of process. This paper presents a novel architecture of modeling process information in 3D scene, the 3D based architecture proposed manages process information on the base of geometries and serial changes, which reflect machining operations applied to part, of geometry of part from raw material to final part and comprises such three sub-modules as manufacturing features, 3D model based processes and manufacturing resources. A methodology is exploited aiming at reducing overload of 3D modeling for process planner and keeping the consistency among 3D working procedure models when inevitable process change occurred, then a related algorithm is detailed in which the process decision information retrieved from the technician is transformed automatically to geometrical information to generate 3D working procedure model. Several typical applying of 3D based process consisting of Recognition and analysis of technology dimension chain based on 3D serial model, NC programming for CMM and analysis of feasibility of process are discussed and a prototype is demonstrated to verifying validity of the architecture and the methodology.

Abstract: Camping is a major parameter of floatation cushion dynamic performance, we could get floatation cushion dynamic performance parameter through research floatation cushion camping performance.This paper uses experiment method to measure floatation cushion film gap and then data processing is by wavelet felixgong principle.Through the comparison of two curves we can observe that the camping of the gas lubricated thrust bearing with elastic pressure equalizing groove is obviously bigger than the gas lubricated thrust bearing with stiffness pressure equalizing groove.So elastic cushion could decay the external drive faster which can improve the cushion’s stability and could be widely used in the future.

Abstract: In manufacturing industry, bonding wires are used to interconnect the pads of a semiconductor chip to terminals of a package containing the chip. With increasing demand of tiny wires, current detection apparatus encounters some limitations. In this paper, a method to detect breakage of tiny bonding wires using diffraction of light is proposed. A laser head generates the light beam, and a slit is introduced in the path of light source, so the slot generates diffraction pattern, and light irradiance loss at the receiver due to the presence of a wire could be observed. Simulation results show that the proposed method with a slit design renders satisfactory detection sensitivity for tiny wires.