Applied Mechanics and Materials Vols. 66-68

Abstract: OBJECTIVE To prepare traditional Chinese pharmaceutical film which can be absorbed through derma and have an effect of topical antibacterial , and take examinations of its film performance. METHODS The active ingredients extracted from the traditional Chinese medicine such as Aloe are blended in a certain proportion as the dressing of chitosan and casted into films. The thickness of the films were measured by the thickness measurement instrument, and the performance of the films was tested and compared such as film forming, swelling and solubility, water holding capacity and permeability. RESULTS Aloe compound film as external applied agent has a desired film performance. CONCLUSION Aloe compound film which could be transdermally absorbed presents a promising potential in adjuvant therapy of ulcers, bedsores and other skin of mucous membrane infections.

Abstract: This paper employed the theories of multibody system dynamics to analyze the multi-rigid-body model of erection system and build the general dynamic models in absolute coordinates. The impact theory of contact mechanics and nonlinear spring-damper force function were used to model the impact problems between rods of multi-stage hydraulic cylinder of erection system and educe the dynamic models of multi-rigid-body erection system with impact. An automatic violation correction method according to the step of integration time was given to solve the violation which is an incident problem in numerical integration of dynamic models in absolute coordinates. Simulation results show that these dynamic models are effective.

Abstract: At present the design of metallurgical engineering materials research largely also depends on the facts and experience accumulation. As a modern tools, computers increasingly play a huge role in today's world of various fields, it has penetrated into every subject areas and daily lifewhich become the symbol of modernization. In material field, computer is also gradually become extremely important tool. It is one of the important reasons that the application of computer in material science makes materials science rapid development .

Abstract: Focus on the trajectory planning problem of shovel operations of skid steer loader, a trajectory curve fitting equation is established. By use of the robotics theory and the D-H method, the functional relationship between the kinematics of the working device of skid steer loader and the displacement, position and orientation of boom bucket cylinder is derived, and the driving equation of displacement cylinder is obtained. Based on the requirements of precise trajectory control, an electro-hydraulic proportional position control system for position and orientation control is designed and the state equation of the system is established. By using fuzzy self-tuning PID control algorithm, the outside interference, parameter uncertainty and the error caused by other factors are weakened. The trajectory tracking simulation results demonstrate that: the biggest shovel tracking error is 12.5mm, the designed electro-hydraulic proportional control system can effectively track the trajectory of the working device of skid steer loader in automatic digging process. The rightness of the established model and the effectiveness of the corresponding controller are also proved.

Abstract: Located in the north of Yun’nan Province, Shuifu wharf on the Jinsha River is an important port on and a key waterway along Yangtze River. The navigation channel is typically mountainous river, with its water area narrow, its trough winding, its surroundings complicated and a variety of cross-river or on-river projects as obstructions. To ensure the safety of navigation and port operation, the two methods of numerical simulation and prototype ship test are adopted to determine the water flow for restricted navigation in Shuifu wharf, i.e., 8000m³/s.

Abstract: To study the surface composition, hardness, microstructure of the machined surface in KT5331AS0 and 45 steel at different cutting parameters and cooling conditions. The results show that: in the cutting process the mass fraction of W in KT5331AS0 steel surface were reduced to varying degrees, the basic chemical composition of 45 steel surface did not change; When KT5331AS0 steel in the high-speed, higher feed rate, it will be cause surface hardness increasing, however the hardness of 45 steel have no regular variation; 45 steel will have greater depth of the torn surface after milling, tearing a wider range, more obvious surface oxidation.

Abstract: This paper proposes a design of the equal duty ratio arbitrary integer frequency divider based on FPGA. First it introduces the characteristics and application domain of FPGA in brief, we discusses a few traditional integer frequency dividers. Finally presents the frequency division theory and circuit design of dual modulus preset decimal frequency divider based on FPGA. The frequency divider is described in VHDL tool and simulated with QUARTERSII6.0.

Abstract: This paper achieved the optimize which is based on the Series processors Produced by NVIDIA, such as Geforce, Tegra, Nexus and so on, and discussed the future development of the video image processor. Expounded the most popular DSP optimization techniques and objectives in the current, to optimized the design for the methods of the various papers available in existence. Based on the NVIDIA's series of products, specific discussed CUDA GPU architecture based on NVIDIA's products, raised the hardware and algorithms of the current most popular video encoding equipment, based on real practical technology to improve the transmission and encoding of multimedia data.

Abstract: Organo-montmorillonite (OMMT)/nature rubber (NR) nanocomposites were prepared by mixing method. The microstructure of these composites was characterized by SEM and XRD. The effect of OMMT on mechanical properties and thermal conductivity of the nanocomposites was investigated in detail. SEM and XRD confirmed the intercalated structure of OMMT/NR nanocomposites. The introduction of a small amount of OMMT greatly improved the mechanical properties and thermal conductivity behavior, which was attributed to the nanometer scale dispersion and stronger interactions between OMMT and NR chains.

Abstract: Pipeline elbows are extensively applied in the liquid-conveying piping system, which vibration and noise control are always difficult and critical. In this paper, the fluid noise and its distribution of the original elbow and optimized structure will be studied based on the structural optimization and solid-liquid coupling characteristics for the liquid-conveying 90ºpipeline elbow. The results show that the max-fluid noise of original pipeline elbow is 22.44dB, the max-fluid noise appears in the original pipeline elbow inside; When the guide plates are designed according to the gold ratio, the number, the radius and the length are 2, 200mm and 40mm respectively, the max-fluid noise is 18.21dB, it decreases 4.23dB compared with the result of original pipeline elbow, the max-fluid noise appears in the original pipeline elbow inside too, when the fluid impact the guide plate, the local fluid noise will be generated.