Applied Mechanics and Materials Vols. 347-350

Abstract: Optimum distribution of viscoelastic materials of damped sandwich plate composite for suppressing plate vibration is investigated. A solid isotropic material with penalization model is described based on the proposed interface finite element of viscoelastic layer. The objective function is chosen as maximization of the modal loss factor. Numerical results show that the optimum distributions of viscoelastic materials are mainly at the place where large shear displacements would be happened.

Abstract: Forming effect of square parts is influenced greatly by technical parameters in hydraulic deep drawing, and it is significative to investigate the parameters. The technical parameters which influence the cold forming effect (wall thickness difference and minimum wall thickness) were introduced in detail by numerical simulation method, including the load method of blank holder force, drawing speed, hydraulic pressure, etc. Furthermore, the reasonable technological parameters were concluded and the wall thickness distribution of magnesium alloy square parts was discussed in this paper. The results show that the cold formability of AZ31B magnesium alloy square parts could be improved when adopt reasonable technological parameters and blank holder force load path in hydraulic deep drawing.

Abstract: In this paper, the theoretical equation of flow injection-cathodic potentiometric stripping analysis for Cl^- ion determination was derived from theoretical analysis, and the experimental equation was summarized using multiple linear regression method. The result shows that the theoretical equation of flow injection-cathodic potentiometric stripping analysis for Cl^- ion is: (dt/dE)_max =K A_p r^-1/2D^2/3-1/6V_f^1/2t_eCx^-/i_s; that the experimental equation of multiple linear regression method is: (dt/dE)_{max Cl}^-1.86×10¹⁰V_f^0.568 t_eC _Cl^-/i_s. The two results are similar on V_f-average flow rate, t_e-concentrate time, C _Cl- -Cl^- ion concentration and i_s constant current.

Abstract: Nanorods of CuCl with an average length of 100-200 nm have been prepared by a simple reaction between CuO suspension and NH₂OH·HCl in the presence of deionized gelatin at room temperature. Gelatin played a decisive role as an inhibitor of the direct attack of NH₂OH·HCl to CuO surfaces and coagulation of the growing CuCl in producing the nanorods. The products were characterized by X-ray powder diffraction and transmission electron microscopy.

Abstract: In order to develop a new test method of the elastic modulus and Poissons ratio, based on the theoretical analysis of the Brazilian disk diametrically loaded by a pair of forces, the relationship is obtained between the total displacement of one point on the vertical direction of the load line and the applied force as well as the elastic modulus and Poissons ratio. The strain gauges with different length are used to measure the displacement of the corresponding point, and then the displacement is employed to calculate the elastic modulus and Poisson's ratio by using the theoretical formula. The proposed method can provide a new approach to estimate the elastic modulus and Poissons ratio by using Brazilian disk splitting tests.

Abstract: In order to provide a theoretical basis for the use of lacustrine soft clay hard shell layer, the first thing to do is understanding its bearing capacity characteristics. Based on the project of Nan-Mao section in Hunan provincial highway S204, combining with bearing capacity test, the bearing capacity characteristics and failure mode of hard shell foundation was comprehensively analyzed. From the field bearing capacity test, it is found that the PS curve of hard shell layer has obvious changes from elastic to plastic, while the PS curve of soft soil layer under hard shell layer just has elastoplastic stage from the beginning, and the failure mode of foundation mainly are punching failure and general shear failure. So for the quality control of lacustrine hard shell soft foundation mainly includes two aspects: the deformation and overall stability.

Abstract: In order to realize consistency and low cost in the production process of the exploding foil initiator, the manufacturing method of exploding foil initiator was studied using micro processing technology. Microcrystalline glass was used as substrate, and magnetron sputtering,photolithography and wet etching technology were utilized to product the metal bridge foil on the surface of the substrate. SU-8 photoresist was used as the barrel material and scanning electron microscope was exploited to characterize structure of the initiator. Through the electrical tests, the flyer was successfully generated and after the barrel had a good integrity.

Abstract: We segmented the solution of sodium alginate into droplets and prepared alginate microcapsule with digital micro-fluidics technique. The Result microcapsule size , compared with the production obtained from pressure extrusion technology, is very uniformity and is distributed in a smaller range. The sample relative standard deviation is only 3.66.The size of alginate microcapsule can easily be controlled by changing the diameter of the nozzle. Furthermore, we can control the size of the alginate microcapsule simply by changing the drive voltage. The results show that this technique is more suitable for cell encapsulation in tissue engineering, cell therapy and biopharmaceutical applications, and provides a solution to the problem of controlling of uniformity, size and membrane thickness.

Abstract: Eight structure-based pharmacophore models of Interleukin-1β converting enzyme (ICE) inhibitors were generated by LigandScout based on ICE inhibitor complexes from the Protein Data Bank (PDB). A combinatorial screening method based on multiple pharmacophore models were proposed in present study, since the binding pockets of different complexes were different, the structure-based pharmacophore models have a high specificity and cannot cover all the active molecules. Based on the screening results of MDDR and the metrics of E and A%, a new metric CAI (comprehensive appraisal index) was defined and used to determine the threshold of hit frequency of molecules which screened by the combinatorial screening method. According to the threshold, the potential ICE inhibitors were then identified from traditional Chinese medicine with the method of combinatorial screening with eight models. The molecules hit by not less than five pharmacophore models were taken as the screening objects of ICE inhibitor, and 781 molecules were obtained.

Abstract: In view of the importance to the peoples health, the body structure of rice bran extruders using for the practical production was systematically designed. The research of this article provided a certain base for the further structural optimization of the rice bran extruder.