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Journal of Bionic Engineering

ISSN 1672-6529

CN 22-1355/TB

Editor-in-Chief : Luquan Ren Published by Science Press and Springer

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30 December 2005, Volume 2 Issue 4
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article
A Biomimetic Hip Joint Simulator and its Application in in vitro Study of the Integrity of Replacement Cemented Hip
Liu Chao-zong 1,4, S.M.Green 2, N.D.Watkins 3, A.W.McCaskie4
J4. 2005, 2 (4):  177-185.  DOI:
Abstract ( 1184 )   PDF  
A biomimetic hip joint simulator that can be used to evaluate the outcome of the cemented total hip replacement has been designed, manufactured and evaluated. The simulator produces motion in the extension/flexion plane, with a socket to rotate internal/externally. At the same time a dynamic loading cycle is applied. A validation test was performed on a cemented femoral stem within a novel composite femur. The bone quality has a strong effect on the stem migration and on the integrity of the interfaces. The migration of the stem is a combination of 3-D translation and rotation of the stem. Under the same loading conditions, weak bone allows more stem migration than strong bone. There is a great decrease in the strength of the stem-cement interface after the dynamic test, and the weak bone composite exhibited a greater reduction in interfacial strength than the strong bone composite. The decrease of the interfacial strength indicates that the primary bonding between the stem and the cement mantle had deteriorated and the integrity of stem-cement interface was damaged. The study demonstrates the value of using a hip joint simulator to investigate stem migration and interface integrity within the cemented hip replacement, suggesting that method can be used for in vitro evaluation of the biomaterials used in the cemented hip replacements.
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Tribological Behavior of Gampsocleis Gratiosa Foot Pad Against Vertical Flat Surfaces
Chen Dong-hui，Tong Jin，Sun Ji-yu，Ren Lu-quan
J4. 2005, 2 (4):  187-194.  DOI:
Abstract ( 1595 )   PDF  
Some tribological behavior between mature Gampsocleis gratiosa foot pads and vertical flats of different materials were studied in this work. stereomicroscope (SMS) and scanning electron microscope (SEM) were used to measure the morphology of the Gampsocleis gratiosa foot pads. An atomic force microscope (AFM) was used to measure the morphologies of the surfaces of glass and a wall doped with calcium carbonate material. The attaching behavior of Gampsocleis gratiosa feet on the two vertical surfaces was observed. The attaching force (perpendicular to the vertical surface) and the static frictional force (along the direction of gravitation) of Gampsocleis gratiosa foot pads on a vertical glass were measured. It was shown that the average attaching force is 50.59 mN and the static frictional force is 259.10 mN. The physical models of the attaching interface between Gampsocleis gratiosa foot pads and the two vertical surfaces were proposed. It was observed that the foot pads are smooth in macroscale; however, the pad surface is composed by approximate hexagonal units with sizes of 3 μm to 7 μm in microscale; the adjacent units are separated by nanoscale grooves. The Observations showed that the Gampsocleis gratiosa can not climb the vertical calcium carbonate wall; in contrast, they can easily climb the vertical glass surface. Based on the features of the geometrical morphologies of the foot pads and the glass surface, we speculate that the attaching force and strong static frictional force are attributed to the inter-inlays between the deformable Gampsocleis gratiosa foot pads and the nanoscale sharp tips of the glass surface.
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Analysis of the Caudal Vortices Evolvement around Flapping Foil
Wang Zhi-dong1, Zhang Xiao-qing1, Su Yu-min2, Xu Yu-ru2
J4. 2005, 2 (4):  195-201.  DOI:
Abstract ( 1152 )   PDF  
The viscous flow field around two-dimensional flapping (heaving and pitching) foils was numerically computed. The structural characteristics of caudal vortices were investigated and the contour curves at different phase angles were obtained. The relationships between the structural characteristics of the vortices and the force acting on the foil and between the widths of the caudal vortex street and of the caudal flow field were analyzed. A method to determine the shedding frequency of the vortices was proposed.
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Iris Identification Technology Based on Multiwavelets
Wei Lian-xin1, Ma Fu-ming1, Xu Tao2, Li Zhi-hui3, Wu Deng-feng2
J4. 2005, 2 (4):  203-207.  DOI:
Abstract ( 1153 )   PDF  
A new method for iris identification based on multiwavelets is proposed. By means of the properties of multiwavelets, such as orthogonality, symmetry, vanishing moments and approximation order, the iris texture can be simply presented. A brief overview of multiwavelets is presented at first. Iris identification system and iris texture feature presentation and recognition based on multiwavelets are introduced subsequently. And the experiment indicates the validity of this method finally.
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Making Biological Materials
Julian F. V. Vincent
J4. 2005, 2 (4):  209-237.  DOI:
Abstract ( 918 )   PDF  
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