reinforcing fibers (glass, carbon, kevlar). Advantages of natural fibers over traditional ones are low cost, high toughness, low density, good specific strength properties, reduced tool wear (nonabrasive to processing equipment), enhanced energy recovery, CO2 neutral when burned, biodegradability. Because of their hollow and cellular nature, natural fibers perform as acoustic and thermal insulators and exhibit reduced bulk density [29,30]. Some of the disadvantages and limitations of natural fibers, when
produce material properties that are different to the materials properties of their own, the material composed is known as Composite Material. The different systems of the elements are combined together to achieve a system which is more useful and more functional than any of the constituent alone. Composite materials are becoming more and more important to today’s material due to the advantages it brings to us. Some clear evidence of the advantages of composite materials is that composite materials
The grafting methods of cellulose and cellulosic materials basically fall into three major types: (1) Initiation by chemical method, (2) Initiation by irradiation and (3) Initiation by thermal method. Investigation by grafting by chemical means is preferred owing to their simple nature and less requirement
scientists are looking to use natural tissues, instead. As transplanted tissues would be living, natural structures, they would be a more natural fit for the body; therefore, becoming more ideal for the long-term replacement of organs. The current disadvantages of this method are the
Self-healing materials are no more an illusion and we are not far away from the days when manmade materials can restore their structural integrity in case of a failure. For example, the cracks in buildings can close on their own or the scratches on car bodies can recover their original shiny appearance by itself. Indeed, this is what everyone can see in case of the natural healing of wounds and cuts in living species. In the case of structural materials the long-time degradation process leads to
one of the most important available materials for construction in Egypt and all over the world. It is used in almost all structures as: buildings, shells, bridges, tunnels, tanks and retaining walls. Concrete is made by mixing binding materials as sand and gravel held together with a paste of cement and water. The use of admixture is to change certain characteristics of concrete such as workability, durability and time of hardening. Concrete has many advantages, such as high compressive strength,
Using patients own tooth fragment have the advantage of obtaining excellent aesthetics, maintenance of original tooth morphology, translucency, economical, time efficient and similar rate of incisal wear[4,5]. Reattachment of teeth was first published by Chosak and tidel in 1964[6] Reaatchment
How would such material respond to the extreme conditions experienced in-service, like deformation, fretting, fatigue, corrosion, wear, etc. Prior research of experimental investigations and theoretical studies would be acknowledged so as to ensure that material and time is not wasted. Analysis of deposited material would be achieved using the commercial finite element program ABAQUS/CAE version 6.14. DESIGN TASK A method for preparing and testing a sample of the material comprises of the
vertical axis turbines. The figure shows different blocks of the wind turbine. Figure 2 Wind turbine Block Diagram 3.1.1 Vertical Axis wind turbine The principal advantage of vertical axis machines, such as the Darrieus rotor is that they don’t need any kind of yaw control to keep them facing into the wind. A second advantage is that the heavy machinery contained in the nacelle (the housing around the generator, gear box, and other mechanical components) can be located down on the ground, where
For example, polyaluminium ferric chloride, a new type of composite coagulant, was reported to have the advantages of high stability and good coagulating effect of hydrophobic and hydrophilic dyes. The discoloration capacity exceeded that of the poly polyferric sulfate and aluminum chloride. On the other hand, to avoid any problem of the