Advanced Materials Research Vols. 468-471

Abstract: In the current work, aminopropyl silicone oil was prepared by condensation reaction followed by chemical modification with high reactive carbon-17 mono-isocyanate. The stability of the emulsion of modified silicone oil was found to be excellent as compared with the untreated silicone oil. The modified silicone oil afforded better yellowing resistance, softness and laundry endurance, with stiffness change only 6.94% and handle retention rate 88.89% after ten launderings.

Abstract: A method which utilizes the power bond graph to establish the flexible hose model is described in this work. By using this method, the paper establishes mathematical modeling for the location of electro-hydraulic proportional control system with the flexible hose. And then, this article completes dynamic simulation by MATLAB and analyses the results of simulation. The effect of the flexible hose parameters on dynamics characteristics of the hydraulic system is also studied.

Abstract: The problem of multi-level block reference is analyzed for the process of information extraction in engineering drawings. And the relationship of reference blocks has been established. By using depth-first algorithm, the multi-level reference path of blocks and the parameter transformation can be searched. Based on the algorithm, an arithmetic flow is proposed. And the method of coordinate transformation of reference blocks is expounded. The new method has important significance for comprehensiveness and accuracy of information automatic extraction of engineering drawings which contains multi-level reference blocks.

Abstract: Flip chip technology is one of the fastest growing segments of microelectronics packaging because of its ability to satisfy the increasing demands of high input/output density, package miniaturization, and reduced cost. A critical element in the successful application of flip chip technology is the reliability of solder bumps. In this paper, a nondestructive inspection method combining ultrasonic excitation with modal analysis is proposed for flip-chip solder bump defect detection. The signal generator and power amplifier are utilized to drive the capacitive air-coupled ultrasonic transducer to produce continuous ultrasonic waves for exciting the test chips. The vibration velocities of the chips are measured by the laser scanning vibrometer to extract the modal shapes and resonance frequencies. The results prove that the defective chips can be distinguished from the good chip by the modal shapes, and the resonance frequencies of the chips decrease with the increase of the open solder bumps. Therefore, this detection method may provide a new path for the improvement and innovation of flip chip on-line inspection systems.

Abstract: The high-temperature oxidation-resistant MoSi2 coating with B addition on Mo substrate was prepared by vacuum cladding. The structure and composition of the coating were investigated by SEM and EDS. The results indicate that good metallurgical bond between all coatings and substrate has been developed. Throughout cracks were avoided by the addition of B. Three multi-layer structures as MoSi2, Mo5SiB2, and Mo3Si were formed by diffusion from outside to inside. The thickness of Mo5SiB2 layer was reduced because of the decreased diffusion coefficient of silicon in MoSi2 with the addition of boron.

Abstract: Student is the subject of the experimental teaching activities, cultivating the ability of independent study and technological innovation is the main aspect in experimental teaching reform. This paper analyzed the problems of traditional teaching model, explored and practiced the multilevel experimental teaching pattern which is based on the blended learning, it made the teachers fully play the leading role, and it fully reflected the subject status of students, it also roused the enthusiasm of students by the use of multi-platforms, media and environments. The multilevel experimental teaching pattern which is based on the blended learning can effectively cultivate the innovation ability of students, and it has achieved good results in practice.

Abstract: The paper advances a multi-loop network power grid monitor based on S3C2410 microprocessor and ATT7022B power measuring chip. Combining the widespread network and low-cost but high performance developing ideology, the paper expands a new network power grid monitor design process. After ATT7022B processes voltage and current data acquisition, the processed data can be read and stored in the local storage unit by S3C2410; If Ethernet link with the local area network, the power parameters can be transmitted to the management computer by Socket pattern, also can be reviewed through the WEB browser, realizing fast automated meter reading and network control. The device, after a period of probation, operates well and featured for its stability, less error, low cost, etc, and has much considerable market value.

Abstract: Equal channel angular pressing (ECAP) was applied to a commercial AZ61 magnesium alloy for up to 8 passes at temperatures as low as 473K. Microstructures and mechanical properties of as-received and ECAP deformed samples were investigated. The microstructure was initially not uniform with a “bimodal” grain size distribution but became increasingly homogeneous with further ECAP passes and the average grain size was considerably reduced from over 26 μm to below 5 μm. The ultimate tensile strength (UTS) decreases clearly after one pass, but increases significantly up to two passes, and then continuously slowly decreases up to six passes, and again increases slightly up to eight passes. In contrast, the uniform elongation increased significantly up to 3 passes, followed by considerable decrease up to 8 passes. These observations may be attributed to combined effects of grain refinement and texture development.

Abstract: [Objective] study the self-innovative learning theory origin and new connotation under the network environment, research on how network environment provides technical support for independent innovation learning. [Process and methods] Adopting the combining of empirical analysis with normative analysis, system analysis with statistical analysis and actual investigation with literature research examine from hardware, resources and culture, technology and other means. [Results] No matter Bruner's cognition discovery theory, Su Baer's cognition assimilation theory or Rodgers's Humanism learning theory on learning view , has attached great importance to significance of learning autonomy in learning activities with the basic thought of learning the essential understanding and learning strategy; independent innovation learning expectations and the participation of the two basic characteristics; network environment provides a good technical support for the self innovative learning either from the cyber source volume, or interactive way, resource configuration and its retrieval and search reliability provided by the network technology. [Conclusion] The applications of Internet, multimedia technology, provide a very broad choice and reliable technical support for learners in the new environment to achieve a variety of means, way, time, space and virtual or real situation and to interact with information transmission web based learning exchanges, so that the innovative learning activities can be richer and more effective under the network environment.

Abstract: Moisture handling property of clothes using fiber is an important factor determininig clothes comfort property. In this paper, the moisture comfort property of fine denier polypropylene fiber fabric in different environmental temperature conditions was studied. By Textile-Microclimate Measuring Instrument, five kinds of test fabrics' dynamic experiments were performed in four different environmental temperature conditions. And fabrics' dynamic comprehensive index was obtained to characterize fabrics' dynamic moisture comfort property. Then, grey system theory was introduced to establish models that could describe the relationship between the static parameters and the dynamic comprehensive index. Results show that the dynamic moisture comfort property of fine denier polypropylene fiber fabric is the best. And fabrics with lower thickness, lower weight, and higher vertical wicking height will be more moisture-comfortable.