Advanced Materials Research Vols. 129-131

Abstract: Equipment parameters management mode that independent from system will help improve compatibility and scalability of system. Aiming at the requirements of equipment compatibility and scalability in system development, the paper brought out a kind of commonly used equipment parameters management design mode. Using XML file to manage configured equipment parameters, the mode loads, managements and parses equipment parameters automatically, which makes it only need to modify configure file in case of add or update equipments. The successful usage of the design mode in monitoring network of some equipment proves its effective and scientific application.

Abstract: Excellent scheduling algorithms can optimize allocation and improve utilization of wireless resources. To improve QoS of wireless networks, this paper presents a Dynamic Weight-Weight Fair Queuing (DW-WFQ) algorithm with differentiated service that is suited to characteristics of wireless networks based on WFQ algorithm. The proposed algorithm adaptively adjusts the weights of queues according to the dynamical measurement of link state. It can fully make use of limited wireless network resources and improve the overall throughput of network.The simulation experiment results using OPNET software tool demonstrate that the proposed algorithm can improve the network throughput and reduce the average end-to-end delay, compared with WFQ algorithm.

Abstract: Key frames play a very important role in video indexing and retrieval. In this paper, we propose a novel method to extract key frames based on information theory. We use improved Bayesian Information Criterion to determining the number of key frames, and then automatically extract key frames to represent video shot based on information bottleneck cluster method. Experimental results and the comparisons with other methods on various types of video sequences show the effectiveness of the proposed method.

Abstract: A novel nanocomposite thin film material of SnO2/WO3 metal oxide compound doped by multi-walled carbon nanotubes (MWCNT) and its corresponding gas sensor were prepared by radio frequency (RF) reactive magnetron sputtering. The surface composition and chemical elements of the thin film material were respectively analyzed and validated by X-ray diffraction (XRD) and photoelectron spectroscopy (XPS). The influencing factors of gas sensing properties were studied and the test results of gas sensor were analyzed. The results indicated that the detection using the composite material gas sensors for low concentration NO2 toxic gas could be greatly improved by MWCNTs which were doped on the mixed oxides matrix. A possible mechanism explaining the behaviour of the thin film gas sensor was introduced.

Abstract: When the practical problem is solved based on finite element method, researchers are often transformed dynamic problem into static one in order to simplify calculation, which brings to large error generally. FEM is good method in solving dynamic characteristics of structure by using only drawings, project and related experienced knowledge. By analyzing the similarities and differences between static FEM and dynamic FEM and discussing their basic principles, the calculation results of static and dynamic FEM are discussed according to the example of simply supported beam with simple harmonic excited force in its midpoint position. The results show that dynamic finite element method has higher solution precise than static one in dealing with practical dynamic problem.

Abstract: Removed due to plagiarism. The original was published as: H. Shinno, H. Yoshioka, K. Taniguchi, A Newly Developed Linear Motor-Driven Aerostatic X-Y Planar Motion Table System for Nano-Machining, CIRP Annals - Manufacturing Technology, V.56, 1, 2007, Pages 369–372 http://www.sciencedirect.com/science/article/pii/S000785060700090X doi:10.1016/j.cirp.2007.05.086

Abstract: The unsaturated poly(silyl ester) has been prepared by the polycondensation reaction of 1, 3-dichloro-tetramethyldisiloxane with di-tert-butyl fumarate. To investigate the crosslinking reaction of the unsaturated poly(silyl ester), poly(tetramethyl disilyloxyl fumarate) was self-crosslinked and cocrosslinked with styrene in the presence of 2, 2'-azobis(isobutyronitri1e) (AIBN) as a radical initiator. After the crosslinking, the unsaturated poly(silyl ester)s, which were viscous liquids, turned into solid products. The characterization of the poly(silyl ester) and the crosslinked product included infrared (IR) spectroscopy, differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). Comparisons were made between the linear poly(silyl ester) and the crosslinked products. It was found that after crosslinking, the important resonance signal for ethenylene (C=C) of the poly(silyl ester) disappeared, which show that the crosslinking reaction is carried out progressively. The glass-transition temperatures of the self-crosslinked and cocrosslinked product were higher than that of the uncrosslinked poly(silyl ester), and the thermal stability of the crosslinked poly(silyl ester)s was better than that of uncrosslinked poly(silyl ester). In degradation tests, the self-crosslinked product degradable completely in 35 minutes and the cocrosslinked product complete mass loss in 5 days and the release of PNA followed the degradation of the crsslinked product. The rate of degradation of the poly(silyl ester) decreased after the crosslinking.

Abstract: The quality and the efficiency of the polishing process are important to the lead time of the rapid tooling. Robotic polishing process with free abrasive is adapted to the finishing of complex mould surface, in which the soft polishing tool is widely used. But the stability and the efficiency of the process should be improved further. According to the moving and grinding characters of the free abrasive, the mixed magnetic abrasive and the minitype electromagnetic field are combined to the robotic polishing process. The mixed magnetic abrasive are made up of magnetic grain and hard abrasive, which can enhance the effective cutting and grinding process of the three-body abrasion under the effect of magnetic field. The robotic compound polishing process with mixed magnetic abrasive is presented in this paper. The experiments are tested to study the distribution of the minitye magnetic field and the polishing efficiency of the complex polishing process. The results show that the polishing efficiency of the process can be improved obviously where the effective working intensity of the electromagnetic field reaches 400Gs.

Abstract: Intrusion detection technology is a kind of network security technology that can protect system from attacks. Based on the definition of system call risk coefficient, the paper brought out a system risk coefficient based dynamic intrusion detection model. Using the model, the drawbacks of traditional intrusion detection method based on system call was solved, which speeds up detection process and decreased false rate and error rate. It can also effectively identify error operations or users. The experiment result also proves the effectiveness and efficiency of the method.

Abstract: Deterioration of concrete exposed to acid rain environment will take a significant effect on the load carrying capacity and durability of the concrete structures. To evaluate the corrosion depth of concrete in acid rain environment, an experimental study was performed with ultrasonic wave technology in the laboratory. In the experiment, sulfate and nitric acid solutions are mixed to simulate the 3 pH levels (pH 3.5, pH 2.5 and pH 1.5) acid rain environments respectively. After being exposed to the simulated acid rain solutions for certain periods, a series of tests (including ultrasonic nondestructive test, Computerized Tomography (CT) test, compressive tests, etc.) were conducted. Damage depth, mass loss, axial compressive strength, and meso-structure of the concrete specimen under different corrosion state were achieved. It was shown that ultrasonic testing is a reliable nondestructive method to measure the damage depth of concrete. A bilinear regression model is proposed to predict the damage depth of concrete, which is in good correlation with testing results from both ultrasonic testing and CT test.