Advanced Materials Research Vols. 179-180

Abstract: The table of L9 (34) of orthogonal design was adopted in the experiment. The optimal formulation and process conditions of electroless nickel plating on high strength aluminum alloy were determined. The influences of bath composition and operating conditions on the hardness and deposition rate were analyzed and discussed. The experimental results show that the optimal plating formulation were obtained, which were consisted of nickel sulfate hexahydrate(25g/L), sodium hypophosphite(20g/L) and sodium acetate(15g/L). The operating conditions are as follows: 80~85°C, pH value 5.0. The coating structure is more homogenous and compact, and the coating has good brightness. Meanwhile, the hardness is up to 376.8HV, and the deposition rate is 17.2μm/h. The order of effects on hardness is pH value, sodium acetate, sodium hypophosphite and nickel sulfate concentration in turn. The hardness of coating decreased after heat treatment on low temperature. When the temperature exceed 200°C, the hardness increased with temperature rising and reached the peak value at 400°C(565.3HV).

Abstract: Sticking problems in injection molds are a significant challenge in product quality control. Molds are usually coated with a surface ceramic layer to prevent sticking problems. This study presents two films deposited on light-guide plate microinjection molds using an unbalanced magnetron sputtering process to investigate the anti-sticking property of molds. The deposited film materials include chromium nitride (Cr-N) and zirconium containing diamond-like carbon (Zr-DLC). The anti-stick film properties examined here include water contact angles, the coefficients of friction, as well as product flatness for the practical injection process. The results show that the performance of Cr-N films involve water contact angles at 111.4 degrees and a coefficient of friction at 0.742, respectively. The performances of Zr-DLC films involve water contact angles at 86.2 degrees and a coefficient of friction at 0.106, respectively. For the practical injection process, the deposited Cr-N films have better anti-sticking property than do the deposited Zr-DLC films.

Abstract: The optoelectronic properties are very important to the design and fabrication of carbon nonoutbe based devices. This paper build the electromagnetic model for the carbon nanotube photosensitive device excited by the light source and making an analysis of optoelectronic properties of the photosensitive device by numerical simulation technology. Based on the theoretical analysis and numerical simulation, some constructive advices for the design of such kind of photosensitive device are given.

Abstract: In order to find a way to study the structure reliability further, the basic system of structural and the methods of analyzing were introduced. For the series system and parallel system, the calculation can be categorized into Point estimated method and interval estimated method. The point estimated method includes Stevenson-Moses method, Probability Network Evaluation Technique, Conditional Probability Method and Integrated Correlation Coefficient Method. The interval estimated method includes General boundaries of range and the narrow boundaries of range. The principle of method and the calculation steps methods were depicted in detail. This study has significance in theory and practice for the study of structural reliability.

Abstract: Thermomechanical treatment was adopted to improve the comprehensive performance of AZ80 magnesium alloys in this paper. The influence of varying the thermal processing parameters and deformation on the microstructure and mechanical properties of AZ80 magnesium alloy was studied, and the optimal process of themomechanical treatment was obtained. The experimental results show that the hardness increased with the increasing of deformation and the hardness is up to the peak value with 30% deformation. After aging, the hardness measurements and microstructure analysis results show that the hardness increased with increasing aging temperature, and reached the peak value at temperature 170°C, while the hardness decreased sharply when the temperature goes beyond 170°C. After thermomechanical treatment, the grains of AZ80 magnesium alloy became uniform and fine. The roles of both deformation strengthening and dispersion strengthening were to improve the mechanical property of AZ80 magnesium alloy.

Abstract: Based on the vehicle CAN bus technology, with features of Hybrid Electric Vehicle (HEV) control network be concerned, CAN bus protocols of application layer suitable for HEV are developed in the paper. And control network is built based on multi-master CAN distributed control technology. Through CAN controller programming of DSP, supported by the corresponding external drive circuit, the motor controller nodes is connected with the vehicle CAN network. Finally the CAN Bus communication of HEV energy assembly control system is designed and realized. Experimental result indicates that the system works well with stable signal and strong anti-jamming ability, and the communication with HEV CAN bus is realized successfully.

Abstract: In recent years the genetic algorithm (GA) has received more and more attention of scholars. In order to find an effective way to use GA widely, the basic knowlege of GA was introduced. After the introduction of its development, characteristic and application, the trends of its modification and application were analyzed. This study has significance in theory and practice for the study of GA.

Abstract: In the history of English and American literature, Romantic Period is so important that cannot be ignored by people. A lot of good writers appeared and their famous works (especially in the field of poetry and prose) were produced. Though many differences between Great Britain and America exist, and the thoughts of writers between the two countries are so different, they have some common senses of Romanticism. This should not be forgotten. In order to point out this problem deeply, we have to pay an attention to the history background of the two countries, to the author’s biography and to the works of them completely. Some important writers such as Wordsworth and Emerson are discussed detailed in the paper.

Abstract: To investigate the regulatory effects of high glucose on the expression of Toll Like Receptor(TLR) Gene and the level of tumor necrosis factor(TNF)-α and interleukin(IL) -6 in human peripheral-blood mononuclear cells . Methods The alterations of TLR1～10 mRNA expression in human peripheral-blood mononuclear cells were quantitated using real-time quantitative-polymerasechain reaction. The level of TNF-α and IL-6 were measured by Enzyme-Linked Immuno Sorbent Assay . The anti-TLRmAb were used to block the mononuclear cells 30 min, high glucose was used to stimulate the cells. Rusults high glucose strongly up-regulated the expression of TLR3、5 mRNA but the expression of the other sub-TLRs weren’t changed .The concentrations of TNF-α、IL-6 were 86.40±8.46 and 874.66±92.84 in high glucose group, all significantly higher than that the control experiment (60.49±6.80 and 541.80±81.08 , all P<0.01), The anti-TLR3mAb and anti-TLR5mAb were used to block the mononuclear cells , The concentrations of TNF-α、IL-6 (72.41±8.52 and 700.59±84.88) were lower than that in the high glucose group, all P<0.05 . Conclusion high glucose may be endogenous ligand of TLRs and high glucose can regulate the release of inflammation cytokines from human peripheral-blood mononuclear cells through TLR signal way.

Abstract: Rigid wing is a kind of wing model when making the experiment of high lift mechanism in insect flight and the research of numerical simulation. In this model, we neglect the wing distortion and regard insect wing as a rigid sheet. On the contrary, flexible wing is a wing model that differs from the rigid wing when analyzing the flight theory of the bionics flapping aerocraft. In this model, we think that the wing distortion has a great effect to lift force and regard insect wing as a flexible sheet. When considering the insect wing as a flexible wing, the force analysis of insect flying has a big difference from the traditional analysis to the rigid wing. Based on the viewpoint of the flexible wing, this paper researches some key points on the flight force of the insect wing such as wing structure, the measures of the wing distortion, the influence from the wing distortion for the lead airstreams angle and the lift coefficient, the reciprocity of the wing distortion and the vortex, Magnus Effect and Wake Capture. A clear understanding toward these problems is a help to know the reason why the flexible wing is advanced to the rigid wing and why the bionics wing just need to make a simple rhythmic locomotion. The discussion in this paper will benefit the future research to the bionics flapping aerocraft with flexible wing.