Results 1 - 10 of 99
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[en] The Uranium atmospheric aerosols affect the Irradiation of workers in radioactive plant. Through the evaluation ,you can make an objective assessment of the safety of the plant. And it can guide the process control. This article evaluated the internal environment air quality of plant by analyzing a large number of inner uranium, fluoride atmospheric aerosols data. It studied why the uranium, fluoride atmospheric aerosols data of private container washing plant higher. And it analyzed the exclusion harm ability of local exhaust purification system in this plant. Then guide to find the problems on process control in container cleaning process. It improved the step of dissolving in container cleaning process. This Effective controlled the phenomenon of material dissipation. (authors)
[en] In 1983, National Institute of Metrology (NIM) began to study alanine-EPR dosimetry system. From 1988 on, the system has been used as a transfer standard to launch into the National Dose Assurance Service (NDAS) programme for cobalt-60 facilities in China. In this paper, the eleven years implementation of NDAS programme are presented by statistics. In 1991, under an IAEA coordinated research programme, NIM had studied to extend the range of the system to therapy level. In recent years, the NIM in cooperation with other institutes has been developing film-alanine dosimeter for electron beam dosimetry. (author)
[en] We present the calculations of the next-to-leading order (NLO) QCD corrections to the inclusive total cross sections for the associated production of the W±H± through bb annihilation in the minimal supersymmetric standard model at the CERN Large Hadron Collider. The NLO QCD corrections can either enhance or reduce the total cross sections, but they generally efficiently reduce the dependence of the total cross sections on the renormalization/factorization scale. The magnitude of the NLO QCD corrections is about 10% in most of the parameter space and can reach 15% in some parameter regions. We also show the Monte Carlo simulation results for the 2j+τjet+peT signature from the W± and the H± decays including the NLO QCD effects, and find an observable signal at a 5σ level in some parameter region of the minimal supergravity model
[en] On the basis of the generalized invariant theory, the invariant-related unitary transformation method is developed and used to study the evolution of the third-quantized wave function of the universe. The expressions for the phases and the wave functions are obtained. Then, by means of the construction of the coherent state, the solutions of the Wheeler-DeWitt equation and the quantum fluctuations caused by the third quantization are found
[en] We present a study on differentiating direct production mechanisms of the newly discovered Higgs-like boson at the LHC based on several inclusive observables. The ratios introduced reveal the parton constituents or initial state radiations involved in the production mechanisms, and are directly sensitive to fractions of contributions from different channels. We select three benchmark models, including the SM Higgs boson, to illustrate how the theoretical predictions of the above ratios are different for the gg, bb-bar(cc-bar), and qq-bar (flavor universal) initial states in the direct production. We study implications of current Tevatron and LHC measurements. We also show expectations from further LHC measurements with high luminosities
[en] When the corrosion of wall-penetrated outlet pipeline of Sea water circulating pump which locate in sea water pumping room was detected, the cause of corrosion are analysed, the corresponding suggestions and improvement programme for corrosion prevention are presented in this paper. (authors)
[en] Highlights: • The measurement of density and viscosity for two fluoro alcohols were carried out. • The density and viscosity data were correlated and good agreement were obtained. • Isobaric VLE data of two fluoro alcohol systems were measured at 101.3 kPa. • The experimental VLE data were well correlated with the Wilson and NRTL model. • The excess Gibbs free energies GE were estimated in this work. - Abstract: The measurements of density, viscosity for 2,2,3,3-tetrafluoro-1-propanol, 2,2,3,3,4,4,5,5-octafluoro-1-pentanol are reported at different temperatures and pressure of 101.3 kPa. The experimental values of densities and viscosities of the above two fluoro alcohols were correlated successfully by a second-order polynomial and by a Vogel–Tammann–Fulcher equation, respectively. Meanwhile, isobaric vapour-liquid equilibrium results for two binary systems of (methanol + 2,2,3,3,4,4,5,5-octafluoro-1-pentanol) and (2,2,3,3-tetrafluoro-1-propanol + 2,2,3,3,4,4,5,5-octafluoro-1-pentanol were determined by a modified Rose type still. Both the Herington area method and the van Ness point to point test method were adopted to confirm the thermodynamic consistency of the experimental VLE findings, for which the test results showed good thermodynamic consistency. The Wilson and non-random two-liquid (NRTL) activity coefficient models were used to correlate the measured VLE values at different temperatures. The correlation results indicate good agreement with the experimental values. Also the binary interaction parameters of the two activity coefficients models were regressed. With the calculation of GE, the negative deviation behaviour was observed for the two binary systems.
[en] Highlights: • LLE data of ethyl acetate/isopropyl acetate + 2,2,3,3-tetrafluoro-1-propanol + water were determined. • The biphasic area decreased with the increasing of temperature. • LLE data were correlated by the NRTL and UNIQUAC models. • Distribution coefficients and selectivities were calculated. • Isopropyl acetate shows higher extraction ability at the same composition range. - Abstract: The liquid-liquid equilibrium (LLE) data for the ternary systems of ethyl acetate + 2,2,3,3-tetrafluoro-1-propanol + water and isopropyl acetate + 2,2,3,3-tetrafluoro-1-propanol + water were measured at T = 298.15 K and T = 318.15 K under 101.3 kPa. Bachman and Hand equations were selected to check and confirm the reliability of the measured tie-line data, and the correlation coefficient (R2) were all close to 1. Meanwhile, the distribution coefficient and separation factor were calculated and discussed in detail. In addition, the nonrandom two-liquid (NRTL) and universal quasi-chemical (UNIQUAC) activity coefficient models were applied to correlate the experimental data, and the RMSD values for the two models obtained are 0.0104, 0.0104 correlated by NRTL, and 0.0077, 0.0128 by UNIQUAC, respectively, which indicate that the experimental LLE data can be successfully correlated by both the NRTL and the UNIQUAC models. Also, the corresponding binary interaction parameters were regressed. The correlated model parameters could be applied for the optimization and design of the separation process.
[en] A high-k/metal gate structure has been investigated for application to state-of-the-art metal-oxide-semiconductor field-effect transistors. In the high-k/metal gate structure, the 32-nm technology node was realized by using the high-k-last, metal-last integration process. We investigated anisotropic deposition for 3-dimensional gate structures on Si substrates utilizing electron-cyclotron-resonance plasma sputtering to reduce parasitic capacitance. Anisotropic HfN film deposition was realized and the deposition thickness on the side wall was reduced with decreasing sputtering gas pressure, from 0.15 to 0.06 Pa, corresponding to Ar/N2 flow ratios of 20/1 and 5/1 sccm. The HfSiON gate insulator formed from the anisotropically deposited HfN film showed an equivalent-oxide-thickness of 2.1 nm and a gate leakage of 3.1 × 10−6A/cm2 at VFB-1.0. - Highlights: ► High-k film deposition was controlled by the deposition pressure. ► The pressure decreases with a reduction of gas flow rate during the high-k film deposition. ► A flat band voltage shows negative shifts with reduction of gas flow rates. ► A reason of the flat band voltage shift is an increase in Si–N bonding.