Advanced Materials Research Vols. 430-432

Abstract: Based on the detection of cast-in-place concrete defects of bored pile as the research object, the scale of the commonly used method for measuring the determination of the defect position, which can't determine the accurate range is very large defect location of the problem, taking the first measurement method, planing initially determined by fan scanning method to determine the accurate out concrete piles defect position method, and digging pile defect position after the actual situation comparison of verifying test, test results are accurate effect and good. In the concrete bored piles detection, the level measurement method that ultrasonic testing is generally used for measuring the location range of the defects inspects too large range , which brings the inspection people can't determine the accurate defect position , affects the normal construction. Based on the engineering practice of using level measuring method and fan scanning technique combining detection methods to solve the determination on the accurate location of the defects in concrete bored piles.

Abstract: The yellow river crossing tunnel runs through limestone at a depth of about 70m below the level of yellow river. Since the river water, phreatic pore water in loose Quaternary deposits and karst/fissure water in limestone communicates with each other, pre-grouting technique has to be employed before drilling and blasting excavation of the tunnel.

Abstract: Thermally enhanced machining is an effective way of processing hard and brittle materials. The Wear performance of diamond saw blade cutting granite plate by Plasma-assisted heating is studied by a homemade experimental device. Investigation of the blade wear in different suspension and heating scan rate shows that by plasma arc heating, the tool wear rate has a significant reduction. A technology for the efficient stone machining and further industrial applications is provided in this paper.

Abstract: This paper has analyzed the quality accidents in interaction between of superstructure with foundation and subgrade, and demonstrated by examples that the interaction among the three is an indispensable key factor in foundation investigation, engineering design and construction.

Abstract: Based on the assumptions:(1)The grouted soil is homogeneous and isotropic;(2)Slurry is Newtonian;(3)Slurry be injected into the strata from the bottom of grouting pipe;(4)In the soil slurry was spread in the ball shape, theoretical formula of the column (ball) expansion of the pressure grouting is derived , and described the FH3’s curing mechanism. This research could provide theoretical guidance for the implementation of grouting.

Abstract: A new Ajax (Asynchronous JavaScript And XML) post (NAP) method for multi-field data including rich text is presented. By reasonable construction of multi-field data structure and using a new server-side analytical algrithm,the method cleverly avoids abstacles which arises in a conventional Ajax post (CAP) method.Test results show that the method is more stable and reliable than CAP method and performs much better than a traditional form post (TFP) method obviously in saving network flux and reducing response time.

Abstract: The failure criteria in strength reduction FEM are not unified and often affected greatly by researcher’s experience and judgment, so it is necessary to discuss the applicability and the difference of some various criteria of instability of slope. According to the thought of visualization in real time computing, the corresponding visual program is developed based on some common failure criteria adopted simultaneity in the strength reduction FEM. Then, through the real-time visual interface, the comparisons of the common failure criteria are conducted. The results show that, the safety factor of a simple slope can be determined clearly from the inflection point of the computational curve based on the criterion of the characteristic nodal displacement and the criterion of equivalent plastic strain exceeding a certain value, by contrast, the safety factor which based on the criterion of the iteration non-convergence lag behind the others in the same condition.

Abstract: Tourism is often viewed as the availability of a clean natural environment without the pollution as the industry, but the hospitality industry, due to its very specific function, operating characteristics and services provided, consumes substantial quantities of energy, water and non-durable products. The resulting environmental impacts of hospitality facilities are thus characteristically greater than those caused by other types of buildings of similar size in China. In recognition of environmental degradation, governments, along with the green movement within the hospitality industry, and travellers, have become increasingly aware of the need for more effective measures to protect the environment. In order to achieve noticeable improvement, the managers and operators of the hospitality industry should be willing to act in an environmentally responsible manner. They also need to have adequate knowledge of the environmental issues pertinent to their activities, and sufficient funds to implement state-of-the-art environmentally sound practices.

Abstract: The key to the fault diagnosis is feature extracting and fault pattern classifying. Principal components analysis (PCA) and support vector machine (SVM) method are introduced to recognize the fault pattern of the rolling bearing in this paper. Multidimensional correlated variable is converted into low dimensional independent eigenvector by means of PCA. The pattern recognition and the nonlinear regression are achieved by the method of SVM. In the light of the feature of vibrating signals, eigenvector is obtained using PCA, fault diagnosis of rolling bearing is recognized correspondingly using SVM fault classifier. Theory and experiment show that the recognition of fault diagnosis of rolling bearing based on PCA and SVM theory is available in the fault pattern recognition and provides a new approach to intelligent fault diagnosis.

Abstract: The hardware system of ultrasonic ranging system in agricultural robot was designed. This ultrasonic ranging system has two most components including the work machine and the receiver. The ultrasonic ranging system hardware design of the agricultural robot included the ranging module and the wireless transceiver module was researched, and the ranging module mainly included the sensors, the processor, the transmitters, and the receiving module mainly includes the receiver, the LCD display module, and the clock chip was analyzed. The result showed that the hardware system of ultrasonic ranging system can satisfy the function requirement of the agricultural robot.