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Based on the ray-tracing simulation, the luminous flux, CCT and ACU affected by the phosphor thickness, concentration and concentration distribution were obtained and studied.
Zong-Yuan Liu et al researched the luminous efficiency and color mixing fraction of conformal coating phosphor LED affected by phosphor thickness and concentration using optical simulation [5].
As far as we are concerned, there are few articles involved the ACU of conformal coated LED affected by the phosphor thickness, concentration and concentration distribution.
The reflection coefficient and absorption coefficients of the cone reflector cup were 0.95 and 0.05.The refractive index and scattering index of the phosphor silicone gel are very important as they determine the optical properties.
For some specific application, angular color uniformity (ACU) is an importance factor of the LED performance specification.

With the development of measuring technology,the measuring accuracy of optical glass refractive index of the increasingly high demand,V prism refractometers is major general instrument for measuring the refractive index of optical glass,not only the simple device,convenient measurement,and this method has high precision performance,however,the accuracy is only attained ,which in the regulation of national metrology verification and the introduction of V prism refractometers in the literature,the classic formula calculation principle formula error caused by refractive index has more than .Based on the mechanical structure and optical transmission to improve the original V prism refractometers the refractive index of air,by considering the influence on measurement precision of V prism refractometer,to mathematical modeling of V prism refractometer the principle formula,V can be measured refractive prism refractometer rate accuracy increased to ,measurement repeatability less than ,has important
Intorduction In the manufacture of optical glass and measuring the refractive index of optical glass,its error directly affect the imaging quality from the optical system.Therefore,the high precision measurement of refractive index of optical glass rate is very necessary.The measurement of refractive index of optical glass rate can be divided into two categories,measuring method and interference method.
The original V prism refractometer mechanical structure and optical path was improved,with the measuring accuracy from the original to .Mathematical model of the original formula of the refractive index is Improved, and this change factor of the air refractive index Is added to the calculation formulas of the refraction index.New mathematical model is set up,which improves the measurement accuracy of V prism refractometer to [1,2]. 1 Measuring method and system composition System composition diagram of high precision automatic V prism refractometer is as shown in figure 1.
The emergent light is deflection 90° by pentaprism.The pentaprism has unique optical properties,so the light is deflected angle of 90° by secondary reflection.And then the image is deflective and vertical.No effect on reflected light 90° reflection is brought with prism position slight movement,and that light of the instrument path can be shorten.
According to the Bessel formula, repetitiveness can be obtained by repeated single measurement by residual error: (16) is the i measurements,and is an average value of 10 measurements in the formula (16). 3 Conclusion This system improves the mechanical structure and the optical transmission of the original V prism refractometer.Considering impact of the air refractive index on the measurement accuracy of V prism refractometer,new mathematical is modeled to the principle formula about V prism refractometer.

Smith1d 1 Department of Mechanical Engineering, University of Bristol, Bristol, BS8 1TR, UK aS.Hossain@bristol.ac.uk, bD.Goudar@bristol.ac.uk, cC.E.Truman@bristol.ac.uk, dDavid.Smith@bristol.ac.uk Keywords: Residual stress, mechanical strain relief, repair weld.
Moreover this did not affect the present study since the weld residual stress fields obtained from the BEGL-FNC model were used as the initial condition for the BU model.
Suitable material properties [2] were used for the parent, girth and repair welded regions. 2.3 Mapping methodology A mapping procedure allowed the stress and strain fields predicted from the weld simulation to be used as the initial condition in the BU model.
A coverage factor of two was used to increase the interval so as to include 95.4% of the population.
From the summary of the results, it may be concluded that the hardening behavior of the weld zone can substantially affect the finite element analysis.

Moreover, friction and wear are largely affected by the nature and properties of these films.
The disc was utilized as-received condition, while the samples were polished using 240, 600 and 1200-grit silicon carbide papers to achieve the final properties and surface finish (Table2).
The decrease of friction coefficient of brass with the increase of sliding speed maybe that’s because to the change in the shear rate which can change the mechanical properties of materials are in contact.
[15] Ma, X.P., Wang, L.J., Liu, C.M., Subramanian, S.V, Microstructure and properties of 13Cr5Ni1Mo0.025Nb0.09V0.06 N super martensitic stainless steel.
[17] Li, C.X., Bell, T, Corrosion properties of plasma nitrided AISI 410 martensitic stainless steel in 3.5 % NaCl and 1 % HCl aqueous solutions.

Taking into account some factors, such as processing conditions, corrosion resistance, hot ductility, etc. we may reasonably come to the conclusion that 1.13% boron concentration in the steel has a better absorption capacity to the low-energy neutron and can effectively reduce the secondary γ-ray effect, meeting the request of radiation protection with reduced material thickness.
Introduction In recent years, with the extensive development of nuclear power, neutron logging and spallation neutron sources research work, Demand for new neutron shielding materials is becoming increase at home and abroad, and boron steel developed by Kobe Steel Factory of Japan is an excellent neutron shielding material because its strong thermal neutrons absorptive capacity and good mechanical properties which can make bending and welding operation easier[1], its promotion can help to optimize shielding structure, reduce shielding weight and volume, so the boron steel has been widely used in the nuclear power industry and nuclear technology application device[2].
In this paper, we simulates interaction between slow neutrons and steel to determine excellent material properties of boron steel by the Monte Carlo method and the MCNP code, and meet the requirement of new nuclear radiation shielding material, such as light texture, small size, resistance high temperature and other characteristics.
As shown in Fig.1(c), attenuation properties of boron steel to 1 keV neutrons are still have a great influence, when the neutron decay 90%, SUS304 needs 24.8 cm thick and KTA-304 steel plate needs 11.6 cm and 9.38 cm., corresponding to 1.13% and 2% boron concentration.
Conclusions This paper studies the properties of boron steel for slow neutron absorption and attenuation, It indicates that there is a great impact on the slow neutron absorption properties due to change of the boron concentration, actually, shield material can use 1.13% boron steel in nuclear waste disposal and transportation container and other materials to absorb slow neutrons.

Finally, some simulations on the influence factor of deicing process are implemented.
We suppose that the physical property of wing material is regular and the temperature on the any part of wing is identical, and the mass lose because of evaporation is ignored.
The basic model parameters such as material thermal property, size of wing and icing parameters are listed in Table 1.
The influence factors on deicing process were researched by simulation.
Physical Properties of Aircraft De-icing and Anti-IcingFluids[R].

The rheological property, curing process and performance of the body were analyzed.
The induction period of the main factors was affected by the initiator added in the gelcasting molded.
Microstructures and mechanical properties of spark plasma sintered Al-SiC composites containing high volume fraction of SiC, Materials Science and Engineering: A, 527(27-28) 92010) 7235-7240

As shown in Fig.1,when the electromagnetic wave signal spreads in media, it will meets the interface with different dielectric properties and produces reflection, dispersion, attenuation and so on.
According to geological surveying data and tunnel construction, Karsts and developing Karsts water are revealed, and the volume of gushing water is greatly affected by these seasons.
(2) During excavation of the tunnel, there are overbreak and underbreak, and meanwhile tunnel supporting structure is not constructed in appropriate way and other unreasonable factors, as a result, there are some void areas between the lining and surrounding rock
Mechanical and construction of road construction machine, 2005, (10) : 8210
(in Chinese) [6] Qiunan Chen,Tunnel Engineering[M].Beijing:Mechanical industry publishing house,2007.8.

The level of polymerization is dependent on many factors, such as presence of water during the hydrolysis and type of organic substituent.
Results The results of fresh mixture properties for SET 1 are shown in Fig. 3 and short term absorption and full saturation in Fig. 4.
Discussion Based on the previously presented results of fresh mixture properties, it is obvious that the SMS interaction affects the workability.
The performed tests compared the properties of the alternated cementitious matrix in both fluid and solid state.
Abd-EL-Khalek, Mechanical and Physico-chemical Properties pf Hardened Portland Cement Paste Containing Hydrophobic Admixtures: Compressive Strength and Hydration Kinetics, ZKG International 52 (1999), pg. 697 - 700 [5] B.

DLC films have long been employed as head and disk overcoats due to their excellent chemical stability, physical integrity and mechanical hardness.
The capacitance and resistance values have been influenced by the DLC film properties.
A low capacitance is desirable as it indicates that the film is less likely to generate a charge current, which could affect the magnetic properties of the device.
Another factor which influences weak point of DLC coverage is the shape of the step profile which causes the shadow effect, this factor shall be further characterized.
Yen et al., “Coverage and properties of a-SiNx hard disk overcoat” J.