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Online since: October 2014
Authors: Luminita Violeta Dumitru, Alina Nela Iliescu, Mihai Berteanu, Ileana Ciobanu, Ruxandra Ileana Badea, Andreea Georgiana Marin, Horatiu Dinu
The authors studied a lot of 31 adult patients with haemophilia, with multiple joints affected by arthropathy.
Recent in vivo studies, on human and animal models, indicate that the tendinal tissue has elastic properties, with important implications on the interaction between tendon and muscle during locomotion.[16, 17, 18] Studies on animal model proved that the stretching of the tendon and the following recoil during relaxation may provide enough elastic energy, reducing the energy costs of locomotion.
The children with haemophilia often experience imobilization periods or periods of partial support (after acute haematrhrosis), periods that can decondition the tendons of the lower limbs, modifying their mechanical properties concerning their ability to store and release elastic energy, disturbing the mechanism of reducing the energy costs of gait.
Studies investigating te mechanical properties of the tendons and their relation with imobilization, with joint damage and with the physical performance are still required.
Mechanical energy fluctuation during walking of healthy and ACL reconstructed subjects.
Online since: November 2013
Authors: Ming Yang, Yang Bai
On the other hand, vibration-assisted machining combines metal forming and small amplitude tools vibration to get lower forming load or better products property.
The chemical composition and mechanical property is listed in Table 1 and Table 2.
Mechanical properties of C5191.
RCA is an important factor that cannot be ignored in metal surface deformation.
In this study, due to the existence of vibration, the deformation of metal foil may be affected by vibration frequency.
Online since: October 2007
Authors: Yoshihiro Hosoya, Toshiaki Urabe, Hiromi Yoshida, Kaneharu Okuda, Hidetaka Kawabe, Yasushi Tanaka
In addition to cold-rolling reduction, grain refinement of hot-bands is one of the most important factors for obtaining high r-value [6,7,8].
It can be inferred that the rolling texture is strongly affected not only by the grain boundary constraints but also by the distribution of precipitates in the hot-bands.
factor in the rolling condition [14], where the preferential order of orientation in α-fiber is {111}<110>, {112}<110>, and {001}<110>.
(c) Mechanical behavior of annealed specimens The microstructures of Steels A and B annealed at 840°C are shown in Fig. 6.
Figure 7 shows the mechanical properties of the annealed specimens.
Online since: January 2013
Authors: Yong Gang Shen, Xu Xie, Gang Wang
Such damage affects the safety of the bridge and can cause water infringement and other defects, directly shortening the service life of the structure.
Wang [1] performed a destructive test on a prestressed concrete slab bridge and reached the conclusion that the failure of concrete hinge joints was the major factor which led to the loss of structural integrity.
The analyses showed the less influence of the hinge concrete strength on the integral loading properties of bridge but the reduction of hinge concrete strength will decrease its tensile capacity and thus lead to the cracks along hinge joints.
Therefore, the value of the film’s elastic modulus directly affects the lateral load distribution of the bridge.
A comparison between the measured results and the model values shows that when the elastic modulus value of the film is approximately 0.75MPa, the force and deformation characteristics obtained by the model calculation are near the measured results, indicating that the results of the model may reflect the mechanical properties of the bridge.
Online since: August 2013
Authors: Seung Yub Baek
Determination for Tool Edge Geometry and Cutting Conditions by Using FEM Simulations and Experiments SeungYub Baek1, a 1Department of mechanical design, Induk University, 14 Choansan-gil, Nowon-gu, Seoul 139-749, South Korea asybaek@induk.ac.kr Keywords: Tool edge, Orthogonal cutting, FEM simulation,Wear, Nose radius Abstract.
However, further data is needed to overcome the uncertainty in the hightemperature and strain rate material property data suitable for simulation of high-speed cutting.Classic orthogonal cutting model for continuous chip formation assumes plane-strain deformationconditions.
Infinite boundary elements are not available in the FEM software used,therefore the tool model is made sufficiently large such that doubling tool model area resulte dinless than1℃ increase in peak tool temperature.This results in the form given in Eq. (3), with depth of cutdcnormalized by1μmto make the base unit-less(μm/μm), and T0am bient temperature of 20℃: ∆T=T-T0=kvsdcn (3) The workpiece and tool third-dimensional depth was 1mm, though this does not affect any temperature values as heat transfer along the third-dimension is neglected in the model.
Tool wear expression in geometry can be realized with two factors: cutting speeds and tool geometry.
It has been identified that the temperature affects the tool wear.
Online since: January 2012
Authors: Hartmut Hoffmann, Martin Hirsch, Peter Demmel, Roland Golle
The blanking process is affected by tool parameters, the press and the material properties of the blanked part.
However, another important factor is the occurring temperature in the shearing zone of the sheet metal due to the dissipation of nearly 95% of the plastic work during blanking and, in addition, frictional heating.
An additional disadvantage is the mechanical weakening of the tool through holes near the cutting edge.
The principle of measurement where these impairments are eliminated is based on the different thermoelectric properties of the tool and the sheet material.
This shows that only small differences in chemical composition (compare Table 1) effect significant changes in the thermoelectric properties.
Online since: September 2011
Authors: H. Kamarudin, M. Bnhussain, A.R. Rafiza, Y. Zarina, Mohd Mustafa Al Bakri Abdullah, Khairul Nizar Ismail
Geopolymer requires an alkaline activator to induce it pozzolanic property and to accelerate the geopolymerisation process.
As CO2 emissions from OPC kilns play a significant role in global greenhouse gas concentrations, this may be a large contributing factor in the incorporation of geopolymers into cement and concrete applications [2].
Hence, the ratio of fly ash to alkaline activator and the ratio of sodium silicate to NaOH affected the strength of the geopolymer.
Furthermore, the ratio of fly ash to alkaline activator and the ratio of sodium silicate to NaOH indicated the parameters affecting the compressive strength of the geopolymer [6].
Norazian, in: 2nd International Conference on Mechanical, Industrial, and Manufacturing Technologies (MIMT). (2011) [15] P.
Online since: July 2011
Authors: Yun Kai Gao, Da Wei Gao
So it becomes the major factor to prevent the door from closing.
Analysis of working principles Loads and deflection analysis on the seals Energy for closing automotive door mostly depends on the compression load deflection properties of the seals.
It consumes much energy which deeply affects on the total energy by the seal system.
So the energy consumed by the venting holes should not be ignored and that the venting holes should be seen as one of major factors in the future research.
Desmet.(2008) ‘Low-frequency dynamic analysis of automotive door weather-strip seals’, Journal of Mechanical Systems and Signal Processing, Vol.22,pp. 1248-1260
Online since: December 2012
Authors: Zhuang Zhao, Hai Yuan Jiang, Hua Chang, Jing Guo
Table 1 Compared with the traditional fixed-wing and rotary-wing aircraft property Fixed-wing aircraft Rotary-wing aircraft Flapping-wing aircraft Advantages Fast and stable No take off distance; agile Biomimetic; low noise; low cost; no take off distance; agile disadvantages A long take off distance; High cost; Poor flexibility Noisy; high cost; low speed Affected by airflow Table 2 Compared with aircrafts which imitating insect and hummingbird property Flapping-wing aircrafts imitating insect and hummingbird Bird-like flexible flapping wing aircraft advantages Miniature size High efficiency by flexible flapping; Energy saving by gliding disadvantages energy-intensive; Mechanical Wear Large Difficult hovering Bionics Mechanism and the Design of Flapping-Wing Aircraft As the structure of the bird’s wing (Fig. 1), the feather would open and close while flapping, and the three joint bones would bend while flapping upward and stretch while flapping downward, this could decrease the resistance
A Summary of Factors Influencing Lift and Drag of the Aircraft 1.
Aerodynamic parameters are modeled and used to analysis the influence factor in the flapping process.
Online since: November 2010
Authors: Ling Li Fu, Tao Chen
Web-based Case Report Form Design For Clinical Trial Lingli Fu1,a, Tao Chen2,b 1Department of Computer Science and Software, Hebei University of Technology, Tianjin, China 2Department of Mechanical Engineering, Hebei University of Technology, Tianjin, China aamy_fu@163.com, byesonme@gmail.com Keywords: clinical data management, electronic data capture, electronic case report form.
The design of the CRF is a critical factor in the capture of high quality data in clinical data management.
CRF must be changed corresponding with the contents of protocol changed that will affect data collection. 2) Only collect information related with project research, and avoid collecting unnecessary information, reduce duplicated and interactive information.
In addition, questions format and order should be reasonable, and consistent with business and clinical trials procedures. 4) Design the objective-based and quantitative problems as far as possible, which will avoid the influence of subjective factors on the clinical data.
In design, there have some display properties for particular items, such as text, multi-text, radio box, check box, select box.
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