Applied Mechanics and Materials Vols. 490-491

Abstract: With the continuously process of prospecting program, our land exploration enter into activity lithostratigrapgy stage. For searching medium and small or subtle reservior, higher seismic data discernibility must be needed. In the explosive source area, surface layer velocity, shot lithology and ghost interface are the three key elements influencing the shot frequency. In view of the trait that the quality of single shot has apparently difference causing by near surface layer Yellow River Delta multiple lithology alternating deposits, we study the characteristics of frequency reponse to lithology and ghost by microseismogram log data, to provide reliable basis for scientific select shooting parameter.

Abstract: With the rapid development of the information age, computer software develops toward systematization and complication. In application areas such as commerce, finance and medical treatment,the performance of software is attracting more and more attention which even becomes one of the important factors to determine whether users are willing to use a piece of software. Currently, static checking tools are mostly designed to check the code errors but pay little attention to the performance problems. In order to detect the defects in source code that may cause performance problems, this paper designs and achieves a performance testing tool based on static analysis method. The experiments of detecting several open source projects using our testing tool demonstrate that it can quickly find the defects in source code with high accuracy rate. The result of defection removing shows that it can significantly reduce the memory consumption of software, and it can effectively improve software performance.

Abstract: Buoyancy-driven oil cluster jumping in porous media is studied by a dynamic pore-network model in relation to secondary oil migration. The model has two novel aspects. First, inertia of fluid and surface roughness of throat are taken into account in simulating the jumping process. Second, a probability technique is proposed to let the model allow a longer time step. The numerical results indicate that the dynamic process of buoyancy-driven cluster jumping is caused not only by porous media heterogeneity, but also by fluid inertia and throat surface roughness. Pressure field characteristics in jumping are studied and a cluster-based pressure solving technique is proposed to reduce the computational demanding of pressure solving. Some statistical characteristics, include cluster size distribution and residual oil saturation, are also studied.

Abstract: Wireless technology has increasingly emerged as one of the demanding technologies in healthcare industry. Monitoring patients’ condition is a crucial task in any hospital to ensure patients are in good and stable condition. Wireless sensor network is the solution and has been widely introduced in measuring vital signs of patients such as temperature, heart rate, oxygen saturation, respiratory rate and others from remote location. Zigbee Network or accurately known as IEEE 802.15.4/Zigbee on the other hand is known to be a low power consumption device with good and stable data transmission range, higher network flexibility and large number of nodes. This work is discussing on integrating heart rate and temperature sensors to a wireless transceiver Zigbee (Xbee) module and is used to measure patients’ conditions from remote location (nurse’s station). Series of tests have been conducted using these devices to measure patients’ heart rate and body temperature for different genders and age group at lying down position. This is to ensure that the devices developed are reliable, stable and producing the same results as conventional devices (thermometer and heart beat reader). Results obtained are very encouraging; the developed devices are producing stable readings and are capable of transmitting information at reasonable distance.

Abstract: The internet of things will bring a new development of intelligent container industry. This paper introduces the concept of the internet of things and intelligent container, it will be the trend of the development of cargo is indicated, the architecture of the intelligent container technology based on the internet of things is proposed and workflow of the intelligent container is summarized. So the application can enable the share of information among logistics participants, making the information flow the transport stream to the same and developing the efficiency and security of the transportation of containers.

Abstract: We compare the ARL of three charts for monitoring the mean shifts of the first-order auto regressive model to choose a proper control chart. Simulation results show that the REWMA chart has a large superior to the EWMA and T² the chart when -1<Ø<0, but when Ø>0, the chart is better than the other two charts.

Abstract: This paper is researching on methods to get the absorption coefficient of the material with large dimension. The absorption coefficient can be got by the source mirror method which the FRF of two pressure signals near the material surface in point source field is obtained. The influence of the factors such as the source height, the material size, horizontal distance and positions of two microphones on the accuracy was analyzed by experiments and the indirect boundary element method. The results from this method discussed in this paper are basically the same with that from the impedance tube.

Abstract: In this paper, the intelligentized way is applied to detecting anomaly intrusion. Based on the global property of genetic algorithm and the locality of neural network, this method effectively improves the convergence speed of the network and the detection accuracy rate. It not only avoids the defect of the neural network, but also improves the precision.

Abstract: Aiming at the low efficiency and precision of nowadays domestic auto-straightening machine of shafts, a new kind of shafts straightness detection system is researched and developed. The supporting part of the measuring mechanism adopts the mechanical structure of auto-going-down of straightening points supporting pedestal. The whole convolute measuring system fixes on the machine tool orbit sliding table, whose movement can change the position for the straightening point and make positioning faster and more accurate. In addition, this detection system bases on applications math and builds math model by Fourier transform which can separate the elliptical error signal, straightness error signal and impulse error signal and then gained ideal straightness error of shafts.

Abstract: In this paper, an unconsolidated conical bearing composed of PTFE and natural rubber is introduced. Experimental study on compressive property of unconsolidated conical bearings is conducted. Origin vertical stiffness and standard vertical stiffness of unconsolidated conical bearings are calculated. The sinusoidal shaking table tests study on a 5-story steel frame isolated structure with unconsolidated conical bearings containing polyurethane damping material or not are carried out. The results show that the unconsolidated conical bearing has good capacity of dissipating energy under pure compressive loading. The amplification coefficient of structural response with unconsolidated conical bearings containing polyurethane is approximately 1.3 and that without polyurethane is approximately 1.8. Energy dissipation structures with the new unconsolidated conical bearings in shock absorption are better than traditional structures.