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Online since: May 2003
Authors: Racquel Z. LeGeros, John P. LeGeros
The only shortcoming of calcium phosphate bioceramics is their poor mechanical properties that do not allow them to be used in load-bearing areas.
Dissolution Properties.
The difference in composition, crystal size and sintering temperature affects the dissolution properties of the calcium phosphates [16,17].
Osteoconductive and osteoinductive properties.
CaP materials offer the appropriate surface properties and composition making them ideal carriers for bioactive peptides, bone growth factors, and mesenchymal stem cells and can therefore be used in tissue engineering for regeneration of hard tissues.
Online since: February 2012
Authors: M.R. Majhi, R. Pyare, S.P. Singh, R. Kumar
Physico-chemical Properties and Characterization of CaO-Fe2O3-P2O5 glass as a Bioactive Ceramic Material M.R Majhi, R.
Pyare Department of Ceramic Engineering, Institute of Technology, Banaras Hindu University, Varanasi-221005, India spsinghceram@gmail.com Keywords: Calcium-Iron-Phosphate, Glass, Properties, FTIR- Spectra, Bioactivity Abstract.
Therefore, the interfacial bond strength which is dependent upon time is also a function of morphological factors such as the change in interfacial area with time, progressive mineralization of interface tissues and resulting increase of elastic modulus of an interfacial bond as well as shear strength per unit of bonded area.
Although, the addition of small amount of Al2O3 in the glass retards the deposition of apatite in SBF solution on glass surface but at the same time alumina has been introduced earlier in bioglasses also to improve their mechanical properties and long term services as implant materials [35]. 4: Discussion 4.1.
Addition of Fe2O3 in the glass at the cost of P2O5 and CaO for the same, adversely affect the bioactivity of the calcium phosphate glass.
Online since: October 2015
Authors: Wina Maryana, Annisa Rahma, Diky Mudhakir, Heni Rachmawati
A number of risk factors such as viral hepatitis (hepatitis B or C virus), alcohol consumption, certain drugs intake, and fat accumulation in the liver (fatty liver) has been associated with chronic liver diseases.
The consequence of these factors is limited bioavailability of silymarin following oral administration [2].
Some product-influencing variables such as evaporation time, hydration media, hydration time, and temperature were previously studied in order to produce lipid vesicles containing silymarin with desired properties.
It can be concluded that concentration and molar ratio of silymarin to phospholipid are the key factors that influenced successful approach.
Effect of fatty acid composition of phospholipids on their antioxidant properties and activity index.
Online since: November 2011
Authors: Jun Wang, Dan Zhang, Li Zeng
It has the features of high mechanical integration, electrical motor construction materials and higher efficiency of drive system components.
In the mechanical system with Multi-Degree-of-Freedom movement, a Multi-Degree-of-Freedom motor can replace two or more Single-Degree of Freedom motor, which greatly simplifies the structure of mechanical systems, reduces size and weight, and eliminates the disadvantages such as free play and friction the gear drive brought etc.
In the Multi-Degree-of-Freedom device used for driving high-speed and super speed, there are mechanical (bearing) supporting wear problems.
The function of bearing significantly affects the reliability of the motor and the utilization ratio of equipment.
Collected Papers of Japanese Mechanical Society(C Edition), 63.612, (1997-8), p: 2707—2713
Online since: May 2003
Authors: Giuseppe Pezzotti
Raman spectra of biomaterials and their stress dependence The interest in the effect of mechanical stress on Raman spectra of inorganic materials has been initially purely academic (see for example, Anastassakis and Burstein [1] and Anastassakis [2]).
(3) where now < � ij > represents the trace of the stress tensor and a is a numerical factor equal to 2 or 3 for equi-biaxial and hydrostatic stress states, respectively.
The knowledge of the piezo-spectroscopic coefficient, � , provides the foundation for micro/nanomechanics assessments of hydroxyapatite-based biomaterials, whose outcome might improve understanding of bone properties/functions and indicate new strategies for improving both processing and biomechanical design.
Low-temperature aging degradation of both phase structure and mechanical properties is caused by the tetragonal-to-monoclinic transformation.
In linearly elastic materials (e.g., synthetic hydroxyapatite made by sintering process), this plot is linear with a slope directly representing the stress intensification factor at crack tip, KI0 [13].
Online since: February 2011
Authors: Zhao Jian Yang, Juan Li Li
Study on XML-Based Apriori Algorithm Applying to Remote Diagnosis System for Hoist Juanli Li a, Zhaojian Yang b 1College of Mechanical Engineering, Taiyuan University of Technology, Taiyuan, Shanxi, 030024, China alijuanli@tyut.edu.cn, byangzhaojian@tyut.edu.cn Keywords: XML; Data Mining; Apriori; Remote Diagnosis.
XML language is not only applicable to network but also can let information provider define the structure, properties and context of data according to the needs of the specific application.
It is import that directly affects the efficiency and accuracy of mining directly.
Steps are as follows: l Confirming the smallest support degree and confidence factor.
Online since: October 2014
Authors: Guo Jun Liu
Creep of concrete can significantly affect the mechanical properties of the structure or component.
According to the internal forces balance theory, Load, humidity and temperature changes in any of a factor will destroy the internal forces balance of the cement paste, it will produce drying shrinkage and creep effect.
Online since: August 2018
Authors: Javier Oliver, I.F. Dias, O. Lloberas-Valls
The remarkable properties of the strain injection techniques in terms of mesh independence and low computational cost have motivated the authors to extend the methodology to 3D.
Adopted Finite Element Formulation This work uses a mixed displacement/strain (/) stabilized formulation (proposed in [3]) that can be deduced from the following weak form of the mechanical problem, (1) where equations (1)(a) and (1)(b) correspond to weak forms of the equilibrium and compatibility equations, respectively, stands for the non-linear constitutive function, for the work rate produced by the external forces, and are the prescribed tractions and body forces, respectively and and are suitable test functions.
By choosing standard bi-linear interpolation functions for the displacement field and element-wise constant interpolation for the strains, in eight-noded hexahedral finite elements, and adding a consistent stabilizing term to the equations, the finite element approximation of equation (1) reads, after some mathematical manipulation (see [3]): (2) where are termed the stabilized stresses, is the stabilization factor, taken equal to 0.1, and stands for the mean value of over the finite element.
As it is shown in Fig. 4, the results obtained with the standard formulation are clearly affected by the mesh orientation, since the localization band follows de mesh alignment.
Online since: September 2016
Authors: Geert de Schutter, Francisco Aracil, Gaetan Dufour, Peter Wauters, Roberto Torrent
Indeed, inadequate compaction, insufficient moist curing, cracks and other defects may impair the permeability of the concrete elements, which is widely regarded as the key factor for the durability of concrete exposed to seawater attack [4, 5].
Site Air-Permeability Testing The visual inspection left some doubts on the extent to which the defects found may affect the performance of the elements.
This test method was chosen, given its good correlation with water sorptivity and penetration of water under pressure (EN 12390-8) [6], relevant properties for the case under consideration.
The AccropodesTM II produced during the first and second month of production may not have sufficient mechanical strength nor durability to perform adequately.
[4] Mehta, P.K., Monteiro, P., “Concrete: Microstructure, Properties and Materials”, 1st Ed., 2001 [5] Richardson, M.G., “Fundamentals of Durable Reinforced Concrete”, Spon Press, 2002 [6] Torrent, R. and Ebensperger, L., "Measurement of the air permeability of concrete 'in situ': status quo", ICCRRR 2012, Cape Town, South Africa, 2-5 September 2012
Online since: January 2012
Authors: Zhi Gang Wu, Muhammad Amjad Sohail, Ahmad Kamran
In many cases, dynamic stall becomes primary limiting factor in the performance of the associated vehicle or structure.
They found that the critical parameter which affects the thrust generation is the Strouhal number based on the wake width or the trailing edge displacement rather than k, the reduced frequency.
The H-H and C-type boundary-fitted grids are generated at first in order to simulate the aerodynamic forces accurately Fig: 1 Generation of mesh around NACA0012 airfoil Governing equations and turbulence models: The system of governing equations for a single-component fluid, written to describe the mean flow properties, is casted in integral Cartesian form for an arbitrary control volume V with differential surface area dA as follows: (1) Where the vectors W, F and G are defined as: Vector H contains source terms such as body forces and energy sources.
Sajjan “ Unsteady Flow past a Combined Pitching and Plunging Aerofoil using an Implicit RANS Solver 2011 International Conference on Mechanical and Aerospace Engineering (CMAE 2011) [14] R.I.
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