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This study reported the results of adding furfural on mechanical properties of Ordinary Iraqi cement.
The published researches in this field that the mineral additives or Portland material have a positive effect on mechanical properties of cement or concrete mixes.
Lamond ; "Factors Influencing concrete Workability", Significance of tests properties of concrete-making, American Society for Testing and Materials, STP 169C, Philadelphia, PA.;(1994)
Lamond ; "Factors Influencing concrete Workability", Significance of tests properties of concrete-making, American Society for Testing and Materials, STP 169C, Philadelphia, PA.;(1994)
Mehta ;" concrete Manual: Structure, properties, and Materials."

Merklein research group systematically investigated the thermal mechanical property of the hot stamping steel [1], and some process problems [2].
Therefore, at this stage, affected by these two factors, the die strain increased rapidly.
Combined effects of these two factors, the strain show a slowly down trend with time.
This estimate ignored the mold surface work hardening and other factors which are all the positive impact of die life.
Wada: Summary of thermal properties for casting alloys and mold materials, University of Michigan, USA, 1982

The paper is concerned with the performance properties of electrospark deposited coatings.
The surface layer forming on the product improves its operational properties [2-4].
Analysis of properties of coatings obtained from EDM requires many methods.
Szalapko, Measurement of electric impulses and properties of carbides electrospark coatings, in: J.I.
Radek, Determining the Operational Properties of Steel Beaters after Electrospark Deposition, Eksploat.

In conclusion, some qualitative aspects regarding the setting of the scaling factors were underlined.
Many factors influence geometry, dimensional accuracy and mechanical properties of the parts build up using SLS.
When it comes to evaluation of the parts, dimensional accuracy, shape accuracy and mechanical properties are the most important issues [6, 7, 8].
There are however many aspects that have to be studied in order to use this technology in custom implants fabrication: geometrical accuracy, mechanical properties, the possibility of cleaning and sterilizing the parts.
Cheung, Effects of energy density on morphology and properties of selective laser sintered polycarbonate, J.

However before mechanical analysis of the composite T-beam, mechanical parameters must be held and input[8-9].
The mechanical parameters are often determined by experiments, which cannot take the influence of concrete factors into account and cannot accurately reflect the factual circumstance.
Bayesian parametric back analysis estimation is a theory that when the conditional distribution of the measuring displacements and the pre-testing distribution are given, the statistical properties of mechanical parameters are the needed quantity only if the post-testing distribution gets its maximum.
And in fact, the convergence of mechanical parameters is not affected by the number of random variables when the method put forward in this paper is applied.
(2) The convergence property of mechanical parameters is not affected by the number of random variables

Predecessors have made a lot of work in experimental study on the creep properties of plastic geogrid which is in high temperature condition , but to the reinforced earth structure in cold regions, the reinforcing material is in the negative temperature conditions in winter, the limit temperature is below -20 ˚C and in summer soil temperature may reach more than +20˚C, how to clarify the change of the creep characteristics of the plastic geogrid under freezing and thawing cycle and how to calculate the design value require experimental study to explore.
From the outside of standard distance, the distance between gauge line and the clamp should be 25 mm, in order to avoid clamping affecting deformation.
Because of the freezing and thawing cycle affecting the creep properties of the plastic geogrid,when the creep has been stable under normal temperature, it will increase in warming phase and will decrease in cooling phase during the freezing and thawing cycle.
Therefore,to the extrapolated value of the long-term creep strain εle,it should be divided by the impact factor of freezing and thawing cycle DR to correct
Experimental Study on Creep Properties of Plastic Geogrid under Low Temperature.

By the method of numerical simulation the variation law of stress-strain with time and space around borehole of impermeable rock medium, variety law of rock physical properties parameters is studied.
It can be seen from result that development and deformation of borehole elastic area mainly affected by ambiequal ground stress value, difference of ambiequal ground stress and rock material properties so on.
Zhao Yizhong (2009)[4] comprehensive considered the role of fluid-solid coupling, the effect of dynamic-made sewing, variable fracture conductivity and other factors, established a new model of de-sand fracturing unconsolidated sandstone reservoir productivity and carried out the optimization of de-sand fracturing capacity under the influence of the factors.
by ambiequal ground stress value, difference of ambiequal ground stress and rock material properties so on.
The results showed that the development of wellbore borehole elastic and deformation, mainly due to the size of the two briefings by the stress, the stress difference between the two briefings and rock material properties and affect of other factors.

The composites exhibit excellent mechanical properties and electrical conductivity.
The most important factors that affect the short fibers reinforcement are carbon fiber content and distribution [4].
Surface treatment for short carbon fibers is critical step to obtain geopolymer compositions of excellent mechanical properties and conductive properties [5].
The effects of fiber content on the mechanical properties, fracture behavior, microstructure and electrical conductivity of composites were investigated. 2.
The composites exhibit excellent mechanical properties and electrical conductivity.

Stainless steels have gained much attention to be an alternative solution for many manufacturing industries due to their high mechanical properties and corrosion resistance.
Stainless steels, considered as difficult to machine materials, are widely used in many fields such as food industry, health, chemical and petrochemical sectors due to their high mechanical properties and excellent corrosion resistance.
Selaimia et al. [10] investigated the effects and optimisation of control factors on surface roughness and cutting forces in a milling operation of the austenitic stainless steel X2CrNi18-9 (AISI 304L) using RSM and desirability approach.
The results showed that the cutting time is the dominant factor affecting workpiece surface roughness followed by feed rate.
It can be concluded that the depth of cut (ap) is the most important factor affecting the Fz with 62.12 % of contribution followed by feed rate with 35.23% of contribution [12,17].

As the key parts, the blades aerodynamic characteristic effects the system properties.
It absorbs energy from airflow, and the turbine transforms kinetic energy to mechanical energy.
As the key parts, the blades aerodynamic characteristics affect the system properties.
When people design RAT, they always use lift coefficient, drag coefficient and attack angle to describe the aerofoil aerodynamic properties, so they can design the turbine geometry, and compute the turbine aerodynamic properties.
Taking into account the workload factors, we select one propeller pitch angle.