Advanced Materials Research Vols. 430-432

Abstract: XML document structure uses the tree structure to express the document structure model that is different from the traditional two-dimensional relational table structure and XML query patterns mainly for tree query. Tree pattern always divided into constrained type and unconstrained type. This paper based on unconstrained tree pattern query, provide a mini algorithm of unconstrained tree pattern query, and prove the correctness of algorithm theoretically.

Abstract: In the process of scientific and technical awarding review each phase involves a lot of sensitive information. In order to embody the fairness and impartiality of review process, the safety protection of sensitive data is particularly important. This paper starts from the identity authentication, designs and implement second check technology. Practice proves that the use of these techniques greatly enhance the security and stability of the system.

Abstract: Since G-codes have been proved limiting the modern manufacturing industry, ISO14649 was put forward. This paper presents a solution to generate ISO14649 files for circuit board milling. The process planning is given, and all the processes needed are contained in the ISO14649 file. Features and machining operations are identified for each process, such as the closed pocket having a “General_closed_profile” attribute and bosses, round holes, slots, the planar face, contour parallel strategy, contour bidirectional strategy and etc. The scenario of one feature with multi tools are put forward to promote the milling efficiency and an entity “Combined_Machining_workingsteps” is proposed. Besides, some other extensions are made, such as entities for representing circuit geometries in machining features. Algorithms for tool paths generation are demonstrated for contour parallel milling and bidirectional milling, where a new algorithm based on pixels is used. The new algorithm can be used in other functions such as detecting uncut regions.

Abstract: Removed due to plagiarism Original has been published in Richards, G. (2011) Creativity and tourism: The state of the art. Annals of Tourism Research, 38(4), Pages 1225-1253. DOI: 10.1016/j.annals.2011.07.008

Abstract: Numerical methods have effective functions in prevention and remedy measures of differential settlement of foundation. And the development of computer-aided technologies magnifies this work. Are these computer-aided numerical methods emerged satisfying now Obviously not, there are stills many flaws in the computer-aided numerical methods of prevention and remedy measures of differential settlement of foundation. In order to overcome these more or less flaws, we have these following methods: Develop essentially theoretical researches of numerical methods for differential settlement of foundation. Establish the data-base of practical examples of differential settlement foundation to provide sufficient precedents for computer-aided numerical methods researches. Get innovations related to and developed from practical appliances of computer-aided numerical methods to differential settlement. Research and develop software for computer-aided numerical methods in the differential settlement of foundation. Couple different numerical methods and thusly increase preciseness and efficiency of computing methods. Enhance measurement techniques of parameters for numerical calculations. Advance theories through practices for computer-aided numerical methods.

Abstract: On the basis of introduced basic principle of fuzzy-artificial neural network, this article constructed a slope stability assessment index system with multi-level fuzzy neural network, and made detailed evaluation criterion according to the assessment characteristics of slope stability. Through introducing the basic principle of multi-level comprehensive assessment from fuzzy mathematics and artificial neural network theory, it overcomes the defect of difficult to be quantified in evaluation process of slope stability. Therefore, it can be better to deal with some uncertain problems occurred in the slope stability assessment process, and as much as possible to express all factors influencing slope stability really and objectively. We selected 20 single factor evaluation indexes to assess slope stability based on surveying the high slope stability in Mian county-Ningqiang county freeway section. It took "normal distribution model function" as a membership function to develop a program with the model of fuzzy neural network. Furthermore, we took 30 typical slope examples as training sample to conduct effectiveness test and feedback test for the program. After the precision requirement was met, we used the program to evaluate 21 high slope examples and compared the results with the ones solved by traditional mechanical methods. The coincidence degree by using two kinds of methods to assess the same slope stability is 76.2%.

Abstract: The thermal and hydraulic performances of working fluid in a cross corrugated channel has been investigated, numerically by a three-dimensional model with a corrugation Plate Heat Exchanger (PHE). The study based on Tondear and Kvaalen’s work that the entropy production uniformity is closely related to the heat exchanger performance, mover an entropy production uniformity factor is defined and used to optimize a corrugation PHE. The entropy production uniformity Criteria and the Performance Evaluation Criteria of the corrugation PHE with two different corrugation angles have been discussed.

Abstract: According to the practical production of 200t bridge crane, the structure and operating conditions of the main girder were studied and the optimal mathematical model was established. Through determining the objective function and boundary constraint conditions, the finite element model was established based on ANSYS and the analysis results were obtained. Using the first order optimization method to optimize the calculating results and comparing with the initial sequence, it shows that the total volume of girder is decreased by about 19.4%. The structural optimization of the main girder gets a preferable economic benefit and provides a foundation for designing the bridge crane girder.

Abstract: In this paper, the mathematical physical model of the heat and moisture transfer in the single-U-tube heat exchanger of a ground source heat pump(GSHP) on well group is established and validated using observed data from the practical rock-soil thermal response test for a resident district in Taiyuan, water in soil is three-dimensional seepage flow and the soil is layered according to the geological structure in the depth direction. The dynamic load of the district for one year is input into the model. The temperature fields of well group are simulated numerically in the two conditions which convalescence periods are omitted or not. It shows that it rather necessary to take the influence of convalescence periods into consideration while predicting the soil temperature field of a GSHP system running for a long term.

Abstract: Vibration rotary forging is a complex precision forming process. In the forming process, the addition of the vibration make the boundary condition and the friction condition of the gear blank and the mould changed with the rotation of the head, which lead the forming process of the spur bevel gears become more complicated. Using the rigid-plastic finite element method to study the metal flow law and the stress distribution of the gear blank during the forming process of the spur bevel gears. Using the DEFORM-3D finite element analysis software to simulate and analysis the forming process of the spur bevel gear, in order to get the forming law of the bevel gear during the different type of the vibration parameters.