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Quasi-close Loop Control of NC Machine Tools Qianqian Wanga, Yihui Fengb , Yulin Wangc School of Mechanical & Automotive Engineering, Hefei University of Technology No. 193, Tunxi Road, Hefei, Anhui 230009, P.
The main factors affecting the control accuracy of open loop NC systems are as follows.
One is the mechanical transmission error, the other is the step losing error of stepping motor.
The fixed compensation methods used by open loop control system are not very effectual for overcoming the elastic deformation and clearance of mechanical transmission system.
This property is very ideal for economical NC lathe.

The chemical-mechanical polishing, electro-rheological fluid polishing, and magneto-rheological fluid polishing methods can be satisfied those demands for the high polishing accuracy and surface roughness.
Advantages of ERF and MRF Chemical-mechanical polishing (CMP), a process involving more chemical reactions than the conventional process, has been applied for a wafer planarization in IC fabrication.
Although the viscosity of ER fluid depends on a number of conditions and properties, it can be simply modeled as Bingham fluid with the assumption that it satisfies the equation (1) in laminar flow. )(Ey���� += & , (1) where � is shear stress, �& is shear rate, � is viscosity, and )(Ey� is yield shear stress of ER fluid.
One of major influencing factors in determining polishing characteristics is the intensity of electric field, because it seriously affects the shear rate.
Lee: Proceedings of Korean Society for Mechanical Engineering, Vol. 1 (2000), p. 597

In these applications, porous tungsten matrix with homogeneous pore distribution and high open porosity are important factors to obtain uniform infiltrates distribution, which has a significant influence on the performance of targeted materials [6].
Table 1 Physical properties of raw materials and classified tungsten powder.
Analysis of Microstructure and Properties of W-Cu Composites.
Zhang, Thermal and electrical properties of Cu composite produced by activated sintering, Mater.
Research on the Mechanical properties and microstructure of W-Mo-Cu Composites[J].

When PCC is as paper filler and coating color, the mean particle size, size distribution and particle shapes could be important factors which have an influence on physical and optical properties of paper.
And these impurities have a bad influence on calcinations of limestone, reactivity of CaO and properties of synthesized PCC.
As shown in Fig. 3, the mechanical properties such as tensile strength, bursting strength, stiffness of the paper were relatively low because the addition of filler decreased the quantity of fiber, and the fine particles of the filler which are located between fibers interrupted the bonding of fibers[4,5,6].
Hemstock, "The effect of clays upon the optical properties of paper" J.
Robinson, "Optical properties of paper as affected by wet-end chemistry" J.

A Resistance Model of Carbon Fiber Composite Materials based on Interfacial Effect Jing Wu 1, a, Aiqin Xu2,b 1College of Science, Naval University of Engineering, Wuhan, 430033, China 2Branch of Mechanical and Electrical Information, Lishui Vocational and Technical College, Lishui, 323000, China aprettygirl.wj@163.com ,bxaqzht@163.com Keywords: Carbon fiber reinforced cement-based composites,compression sensitivity,resistance model Abstract.
But the sensitive resistance was affected by many factors, including interface properties of carbon fiber and cement matrix contact,which is the bridge of information transmission.
It will directly affect the performance of carbon fiber reinforced cement based composites [1-3].

Parts of the material physical properties of Si3N4 ceramics [9] are shown in Table 1.
Chinese Journal of Mechanical Engineering, 2000, 36(11): 75-79
Chinese Journal of Mechanical Engineering, 2002, 38(6): 61-66
Chinese Journal of Mechanical Engineering, 2008, 44(8): 132-136
Chinese Press of Mechanical Industry, 2008, 1: 22-24

For the theoretical study of the rolling process, Forge2011® was employed, which is finite element method-relying software that enables the thermo-mechanical simulation of rolling processes in a triaxial state of strain.
In order to use the results of simulation employing the simplified Archard model for the quantitative evaluation of roll wear, it is necessary to define the factor of wear and the hardness of the tool as a function of temperature.
Introduction The continuous rolling of long products can be ranked among the most efficient processes that enable a long product having high mechanical and strength properties and good quality of the surface to be obtained within a narrow range of dimensional tolerance.
The passes wear during operation, which affects the dimensional accuracy of the finished product and the run of the rolling process [1–3].
Sideris, Comparison of wear properties of tool steels AISI D2 and O1 with the same hardness, Tribology International, Elsevier, 39 (2006) 479–489

Among the factors that determined the characteristics of the MAO coatings, which included power source, oxidation time, the electrolyte composition and concentration, applied voltage and current density.
So the modifier EDTA-2Na with appropriate content would improve the surface properties of the biological inert ceramic coating.
The modifier EDTA-2Na with appropriate content would improve the surface properties of the biological inert ceramic coating.The introduce of doped EDTA-2Na improved the corrosion resistance properties.
Structure and mechanical properties of magnesium alloy treated by micro-arc discharge oxidation using direct current and high-frequency bipolar pulsing modes [J].
Duo, Influence of phytic acid concentration on coating properties obtained by MAO treatment on magnesium alloys [J].

School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China Email:lanzhouxuyt@163.com Key words:Graphite;Molten Solar Salt;Hot corrosion;Graphitization degree Abstract: Solar Salt is the best hot transfer medium molten salt of solar thermal power generation.In order to study the hot corrosion behavior of four graphite is in the molten Solar Salt.The graphite immersed equipped with molten salt crucible placed in a muffle furnace,each period of time remove the sample and weight the weight gain until the sample is completely destroyed.The destruction forming of graphite is analyzed by XRD, SEM and OP.The study found that the order of hot resistant corrosion of molten Solar Salt of four graphite materials are the fine structuregraphite,isostatic graphite,9# graphite and cold pressing graphite.The principal factors can affect hot corrosion resistant of graphite is the graphitization degree.
Molten salt mixture properties in RELAP5 code for thermodynamic solar applications[J].
The preparation and properties of multi-component molten salts[J].
Effect of graphitization degree on the mechanical properties of C/C composites[J].Journal of Central South University of Technology (Natural Science),.2001,32(3):289-293
Effect of graphitization degree on properties of self baking carbon block[J].

quality control is better, Improve the quality of engineering and construction, Improve floor performance, Easy to control in the factory production of concrete protective layer thickness, Reinforced positioning control, ratio control of the concrete, the density of concrete control, concrete curing conditions, making the durability of the final component, which is the building of life greatly improved; Due to the presence of abdominal rod reinforced, Compared with ordinary laminated slabs of concrete, precast panels with a better overall performance; (2) Shorten the construction period, factory produced, significantly reduce on-site steel banding workload; The construction phase, the construction of prefabricated parts can be used as platforms and end of superimposed layers of concrete mold, elimination of cumbersome template works; The production cycle is short, Convenient on-site construction, Greatly improve the speed of construction, shorten the duration, construction of climate-affected
The structural elements affected by the residual deformation after the load is one of the important indicators to reveal the structure mechanical performance, so the residual deformation in structural tests should be observed structure uninstall structural deformation data recovery capabilities.
For the experimental phenomena and failure modes of treatment options: Can be a connection reinforced by increasing the seams of the reinforcement and anchorage length or lower reinforcement position, Measures to improve the effective height of structure, to make up for the widget in the local carrying capacity. 4 Splice plate bearing capacity factors The test only by increasing the seams connection reinforcement amount and anchorage length measures to improve the bearing capacity of the splice plate, did not consider the seams cross-section is the effective height of the splice plate bearing capacity.
Analysis and calculation to be seen: Seams section effective height is an important factor to affect splicing plate flexural capacity.
Through structural measures to increase the effective height of the cross-section of seams, improve the bearing capacity of the splice plate is feasible. 5 Conclusions Composite Slab static load test, to study the bearing capacity of deformation properties of the cracks to carry out the law is the mechanical characteristics of cross-section, the necessary analysis and test results , and analysis and experimental results were compared:1) Enhance superimposed board reinforcement at the seams and anchoring measures or change Reinforced location to increase the effective height, which not only can effectively pass internal forces, also improve the stitching laminated slabs of carrying capacity, so basically reached the benchmark Slab resistance; 2)Through appropriate structural measures to increase the effective height of the cross-section of seams to further enhance splicing carrying capacity of the composite plate; 3)Rely on a patchwork force transmission, composite panels can be two-way